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 void 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));
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;
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;
323 get the traffic load value for tid
325 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
327 u32 curr_time = jiffies_to_msecs(jiffies);
330 struct iwl4965_traffic_load *tl = NULL;
332 if (tid >= TID_MAX_LOAD_COUNT)
335 tl = &(lq_data->load[tid]);
337 curr_time -= curr_time % TID_ROUND_VALUE;
339 if (!(tl->queue_count))
342 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
343 index = time_diff / TID_QUEUE_CELL_SPACING;
345 /* The history is too long: remove data that is older than */
346 /* TID_MAX_TIME_DIFF */
347 if (index >= TID_QUEUE_MAX_SIZE)
348 rs_tl_rm_old_stats(tl, curr_time);
353 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
354 struct iwl4965_lq_sta *lq_data, u8 tid,
355 struct sta_info *sta)
358 DECLARE_MAC_BUF(mac);
360 spin_lock_bh(&sta->lock);
361 state = sta->ampdu_mlme.tid_state_tx[tid];
362 spin_unlock_bh(&sta->lock);
364 if (state == HT_AGG_STATE_IDLE &&
365 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
366 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
367 print_mac(mac, sta->addr), tid);
368 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
372 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
373 struct iwl4965_lq_sta *lq_data,
374 struct sta_info *sta)
376 if ((tid < TID_MAX_LOAD_COUNT))
377 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
378 else if (tid == IWL_AGG_ALL_TID)
379 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
380 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
383 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
385 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
386 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
387 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
391 * rs_collect_tx_data - Update the success/failure sliding window
393 * We keep a sliding window of the last 62 packets transmitted
394 * at this rate. window->data contains the bitmask of successful
397 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
398 int scale_index, s32 tpt, int retries,
401 struct iwl4965_rate_scale_data *window = NULL;
402 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
405 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
408 /* Select data for current tx bit rate */
409 window = &(windows[scale_index]);
412 * Keep track of only the latest 62 tx frame attempts in this rate's
413 * history window; anything older isn't really relevant any more.
414 * If we have filled up the sliding window, drop the oldest attempt;
415 * if the oldest attempt (highest bit in bitmap) shows "success",
416 * subtract "1" from the success counter (this is the main reason
417 * we keep these bitmaps!).
419 while (retries > 0) {
420 if (window->counter >= IWL_RATE_MAX_WINDOW) {
422 /* remove earliest */
423 window->counter = IWL_RATE_MAX_WINDOW - 1;
425 if (window->data & mask) {
426 window->data &= ~mask;
427 window->success_counter--;
431 /* Increment frames-attempted counter */
434 /* Shift bitmap by one frame (throw away oldest history),
435 * OR in "1", and increment "success" if this
436 * frame was successful. */
439 window->success_counter++;
447 /* Calculate current success ratio, avoid divide-by-0! */
448 if (window->counter > 0)
449 window->success_ratio = 128 * (100 * window->success_counter)
452 window->success_ratio = IWL_INVALID_VALUE;
454 fail_count = window->counter - window->success_counter;
456 /* Calculate average throughput, if we have enough history. */
457 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
458 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
459 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
461 window->average_tpt = IWL_INVALID_VALUE;
463 /* Tag this window as having been updated */
464 window->stamp = jiffies;
470 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
472 /* FIXME:RS:remove this function and put the flags statically in the table */
473 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
474 int index, u8 use_green)
476 u32 rate_n_flags = 0;
478 if (is_legacy(tbl->lq_type)) {
479 rate_n_flags = iwl_rates[index].plcp;
480 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
481 rate_n_flags |= RATE_MCS_CCK_MSK;
483 } else if (is_Ht(tbl->lq_type)) {
484 if (index > IWL_LAST_OFDM_RATE) {
485 IWL_ERROR("invalid HT rate index %d\n", index);
486 index = IWL_LAST_OFDM_RATE;
488 rate_n_flags = RATE_MCS_HT_MSK;
490 if (is_siso(tbl->lq_type))
491 rate_n_flags |= iwl_rates[index].plcp_siso;
492 else if (is_mimo2(tbl->lq_type))
493 rate_n_flags |= iwl_rates[index].plcp_mimo2;
495 rate_n_flags |= iwl_rates[index].plcp_mimo3;
497 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
500 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
501 RATE_MCS_ANT_ABC_MSK);
503 if (is_Ht(tbl->lq_type)) {
506 rate_n_flags |= RATE_MCS_DUP_MSK;
508 rate_n_flags |= RATE_MCS_FAT_MSK;
511 rate_n_flags |= RATE_MCS_SGI_MSK;
514 rate_n_flags |= RATE_MCS_GF_MSK;
515 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
516 rate_n_flags &= ~RATE_MCS_SGI_MSK;
517 IWL_ERROR("GF was set with SGI:SISO\n");
525 * Interpret uCode API's rate_n_flags format,
526 * fill "search" or "active" tx mode table.
528 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
529 enum ieee80211_band band,
530 struct iwl4965_scale_tbl_info *tbl,
533 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
534 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
537 *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
539 if (*rate_idx == IWL_RATE_INVALID) {
543 tbl->is_SGI = 0; /* default legacy setup */
546 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
547 tbl->lq_type = LQ_NONE;
549 /* legacy rate format */
550 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
551 if (num_of_ant == 1) {
552 if (band == IEEE80211_BAND_5GHZ)
559 if (rate_n_flags & RATE_MCS_SGI_MSK)
562 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
563 (rate_n_flags & RATE_MCS_DUP_MSK))
566 if (rate_n_flags & RATE_MCS_DUP_MSK)
569 mcs = rs_extract_rate(rate_n_flags);
572 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
574 tbl->lq_type = LQ_SISO; /*else NONE*/
576 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
578 tbl->lq_type = LQ_MIMO2;
582 tbl->lq_type = LQ_MIMO3;
588 /* switch to another antenna/antennas and return 1 */
589 /* if no other valid antenna found, return 0 */
590 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
591 struct iwl4965_scale_tbl_info *tbl)
595 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
598 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
601 new_ant_type = ant_toggle_lookup[tbl->ant_type];
603 while ((new_ant_type != tbl->ant_type) &&
604 !rs_is_valid_ant(valid_ant, new_ant_type))
605 new_ant_type = ant_toggle_lookup[new_ant_type];
607 if (new_ant_type == tbl->ant_type)
610 tbl->ant_type = new_ant_type;
611 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
612 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
616 /* FIXME:RS: in 4965 we don't use greenfield at all */
617 /* FIXME:RS: don't use greenfield for now in TX */
619 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
621 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
622 priv->current_ht_config.is_green_field &&
623 !priv->current_ht_config.non_GF_STA_present);
626 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
632 * rs_get_supported_rates - get the available rates
634 * if management frame or broadcast frame only return
635 * basic available rates.
638 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
639 struct ieee80211_hdr *hdr,
640 enum iwl_table_type rate_type)
642 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
643 lq_sta->active_rate_basic)
644 return lq_sta->active_rate_basic;
646 if (is_legacy(rate_type)) {
647 return lq_sta->active_legacy_rate;
649 if (is_siso(rate_type))
650 return lq_sta->active_siso_rate;
651 else if (is_mimo2(rate_type))
652 return lq_sta->active_mimo2_rate;
654 return lq_sta->active_mimo3_rate;
658 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
661 u8 high = IWL_RATE_INVALID;
662 u8 low = IWL_RATE_INVALID;
664 /* 802.11A or ht walks to the next literal adjacent rate in
666 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
670 /* Find the previous rate that is in the rate mask */
672 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
673 if (rate_mask & mask) {
679 /* Find the next rate that is in the rate mask */
681 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
682 if (rate_mask & mask) {
688 return (high << 8) | low;
692 while (low != IWL_RATE_INVALID) {
693 low = iwl_rates[low].prev_rs;
694 if (low == IWL_RATE_INVALID)
696 if (rate_mask & (1 << low))
698 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
702 while (high != IWL_RATE_INVALID) {
703 high = iwl_rates[high].next_rs;
704 if (high == IWL_RATE_INVALID)
706 if (rate_mask & (1 << high))
708 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
711 return (high << 8) | low;
714 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
715 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
721 u8 switch_to_legacy = 0;
722 u8 is_green = lq_sta->is_green;
724 /* check if we need to switch from HT to legacy rates.
725 * assumption is that mandatory rates (1Mbps or 6Mbps)
726 * are always supported (spec demand) */
727 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
728 switch_to_legacy = 1;
729 scale_index = rs_ht_to_legacy[scale_index];
730 if (lq_sta->band == IEEE80211_BAND_5GHZ)
735 if (num_of_ant(tbl->ant_type) > 1)
736 tbl->ant_type = ANT_A;/*FIXME:RS*/
742 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
744 /* Mask with station rate restriction */
745 if (is_legacy(tbl->lq_type)) {
746 /* supp_rates has no CCK bits in A mode */
747 if (lq_sta->band == IEEE80211_BAND_5GHZ)
748 rate_mask = (u16)(rate_mask &
749 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
751 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
754 /* If we switched from HT to legacy, check current rate */
755 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
760 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
762 low = high_low & 0xff;
764 if (low == IWL_RATE_INVALID)
768 return rate_n_flags_from_tbl(tbl, low, is_green);
772 * mac80211 sends us Tx status
774 static void rs_tx_status(void *priv_rate, struct net_device *dev,
779 int rs_index, index = 0;
780 struct iwl4965_lq_sta *lq_sta;
781 struct iwl_link_quality_cmd *table;
782 struct sta_info *sta;
783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
784 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
785 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
786 struct ieee80211_hw *hw = local_to_hw(local);
787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
788 struct iwl4965_rate_scale_data *window = NULL;
789 struct iwl4965_rate_scale_data *search_win = NULL;
791 struct iwl4965_scale_tbl_info tbl_type;
792 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
794 u16 fc = le16_to_cpu(hdr->frame_control);
797 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
799 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
802 /* This packet was aggregated but doesn't carry rate scale info */
803 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
804 !(info->flags & IEEE80211_TX_STAT_AMPDU))
807 retries = info->status.retry_count;
814 sta = sta_info_get(local, hdr->addr1);
816 if (!sta || !sta->rate_ctrl_priv)
820 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
822 if (!priv->lq_mngr.lq_ready)
825 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
826 !lq_sta->ibss_sta_added)
830 active_index = lq_sta->active_tbl;
832 curr_tbl = &(lq_sta->lq_info[active_index]);
833 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
834 window = (struct iwl4965_rate_scale_data *)
836 search_win = (struct iwl4965_rate_scale_data *)
837 &(search_tbl->win[0]);
840 * Ignore this Tx frame response if its initial rate doesn't match
841 * that of latest Link Quality command. There may be stragglers
842 * from a previous Link Quality command, but we're no longer interested
843 * in those; they're either from the "active" mode while we're trying
844 * to check "search" mode, or a prior "search" mode after we've moved
845 * to a new "search" mode (which might become the new "active" mode).
847 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
848 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
849 if (priv->band == IEEE80211_BAND_5GHZ)
850 rs_index -= IWL_FIRST_OFDM_RATE;
852 if ((info->tx_rate_idx < 0) ||
854 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
856 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
858 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
859 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
860 (!!(tx_rate & RATE_MCS_HT_MSK) ^
861 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
862 (!!(tx_rate & RATE_MCS_GF_MSK) ^
863 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
864 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
865 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
866 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
870 /* Update frame history window with "failure" for each Tx retry. */
872 /* Look up the rate and other info used for each tx attempt.
873 * Each tx attempt steps one entry deeper in the rate table. */
874 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
875 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
876 &tbl_type, &rs_index);
878 /* If type matches "search" table,
879 * add failure to "search" history */
880 if ((tbl_type.lq_type == search_tbl->lq_type) &&
881 (tbl_type.ant_type == search_tbl->ant_type) &&
882 (tbl_type.is_SGI == search_tbl->is_SGI)) {
883 if (search_tbl->expected_tpt)
884 tpt = search_tbl->expected_tpt[rs_index];
887 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
889 /* Else if type matches "current/active" table,
890 * add failure to "current/active" history */
891 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
892 (tbl_type.ant_type == curr_tbl->ant_type) &&
893 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
894 if (curr_tbl->expected_tpt)
895 tpt = curr_tbl->expected_tpt[rs_index];
898 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
901 /* If not searching for a new mode, increment failed counter
902 * ... this helps determine when to start searching again */
903 if (lq_sta->stay_in_tbl)
904 lq_sta->total_failed++;
911 * Find (by rate) the history window to update with final Tx attempt;
912 * if Tx was successful first try, use original rate,
913 * else look up the rate that was, finally, successful.
915 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
916 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
918 /* Update frame history window with "success" if Tx got ACKed ... */
919 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
921 /* If type matches "search" table,
922 * add final tx status to "search" history */
923 if ((tbl_type.lq_type == search_tbl->lq_type) &&
924 (tbl_type.ant_type == search_tbl->ant_type) &&
925 (tbl_type.is_SGI == search_tbl->is_SGI)) {
926 if (search_tbl->expected_tpt)
927 tpt = search_tbl->expected_tpt[rs_index];
930 if (info->flags & IEEE80211_TX_CTL_AMPDU)
931 rs_collect_tx_data(search_win, rs_index, tpt,
932 info->status.ampdu_ack_len,
933 info->status.ampdu_ack_map);
935 rs_collect_tx_data(search_win, rs_index, tpt,
937 /* Else if type matches "current/active" table,
938 * add final tx status to "current/active" history */
939 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
940 (tbl_type.ant_type == curr_tbl->ant_type) &&
941 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
942 if (curr_tbl->expected_tpt)
943 tpt = curr_tbl->expected_tpt[rs_index];
946 if (info->flags & IEEE80211_TX_CTL_AMPDU)
947 rs_collect_tx_data(window, rs_index, tpt,
948 info->status.ampdu_ack_len,
949 info->status.ampdu_ack_map);
951 rs_collect_tx_data(window, rs_index, tpt,
955 /* If not searching for new mode, increment success/failed counter
956 * ... these help determine when to start searching again */
957 if (lq_sta->stay_in_tbl) {
958 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
959 lq_sta->total_success += info->status.ampdu_ack_map;
960 lq_sta->total_failed +=
961 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
964 lq_sta->total_success++;
966 lq_sta->total_failed++;
970 /* See if there's a better rate or modulation mode to try. */
971 rs_rate_scale_perform(priv, dev, hdr, sta);
978 * Begin a period of staying with a selected modulation mode.
979 * Set "stay_in_tbl" flag to prevent any mode switches.
980 * Set frame tx success limits according to legacy vs. high-throughput,
981 * and reset overall (spanning all rates) tx success history statistics.
982 * These control how long we stay using same modulation mode before
983 * searching for a new mode.
985 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
986 struct iwl4965_lq_sta *lq_sta)
988 IWL_DEBUG_RATE("we are staying in the same table\n");
989 lq_sta->stay_in_tbl = 1; /* only place this gets set */
991 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
992 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
993 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
995 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
996 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
997 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
999 lq_sta->table_count = 0;
1000 lq_sta->total_failed = 0;
1001 lq_sta->total_success = 0;
1005 * Find correct throughput table for given mode of modulation
1007 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1008 struct iwl4965_scale_tbl_info *tbl)
1010 if (is_legacy(tbl->lq_type)) {
1011 if (!is_a_band(tbl->lq_type))
1012 tbl->expected_tpt = expected_tpt_G;
1014 tbl->expected_tpt = expected_tpt_A;
1015 } else if (is_siso(tbl->lq_type)) {
1016 if (tbl->is_fat && !lq_sta->is_dup)
1018 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1020 tbl->expected_tpt = expected_tpt_siso40MHz;
1021 else if (tbl->is_SGI)
1022 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1024 tbl->expected_tpt = expected_tpt_siso20MHz;
1026 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1027 if (tbl->is_fat && !lq_sta->is_dup)
1029 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1031 tbl->expected_tpt = expected_tpt_mimo40MHz;
1032 else if (tbl->is_SGI)
1033 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1035 tbl->expected_tpt = expected_tpt_mimo20MHz;
1037 tbl->expected_tpt = expected_tpt_G;
1041 * Find starting rate for new "search" high-throughput mode of modulation.
1042 * Goal is to find lowest expected rate (under perfect conditions) that is
1043 * above the current measured throughput of "active" mode, to give new mode
1044 * a fair chance to prove itself without too many challenges.
1046 * This gets called when transitioning to more aggressive modulation
1047 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1048 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1049 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1050 * bit rate will typically need to increase, but not if performance was bad.
1052 static s32 rs_get_best_rate(struct iwl_priv *priv,
1053 struct iwl4965_lq_sta *lq_sta,
1054 struct iwl4965_scale_tbl_info *tbl, /* "search" */
1055 u16 rate_mask, s8 index)
1057 /* "active" values */
1058 struct iwl4965_scale_tbl_info *active_tbl =
1059 &(lq_sta->lq_info[lq_sta->active_tbl]);
1060 s32 active_sr = active_tbl->win[index].success_ratio;
1061 s32 active_tpt = active_tbl->expected_tpt[index];
1063 /* expected "search" throughput */
1064 s32 *tpt_tbl = tbl->expected_tpt;
1066 s32 new_rate, high, low, start_hi;
1070 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1073 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1076 low = high_low & 0xff;
1077 high = (high_low >> 8) & 0xff;
1080 * Lower the "search" bit rate, to give new "search" mode
1081 * approximately the same throughput as "active" if:
1083 * 1) "Active" mode has been working modestly well (but not
1084 * great), and expected "search" throughput (under perfect
1085 * conditions) at candidate rate is above the actual
1086 * measured "active" throughput (but less than expected
1087 * "active" throughput under perfect conditions).
1089 * 2) "Active" mode has been working perfectly or very well
1090 * and expected "search" throughput (under perfect
1091 * conditions) at candidate rate is above expected
1092 * "active" throughput (under perfect conditions).
1094 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1095 ((active_sr > IWL_RATE_DECREASE_TH) &&
1096 (active_sr <= IWL_RATE_HIGH_TH) &&
1097 (tpt_tbl[rate] <= active_tpt))) ||
1098 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1099 (tpt_tbl[rate] > active_tpt))) {
1101 /* (2nd or later pass)
1102 * If we've already tried to raise the rate, and are
1103 * now trying to lower it, use the higher rate. */
1104 if (start_hi != IWL_RATE_INVALID) {
1105 new_rate = start_hi;
1111 /* Loop again with lower rate */
1112 if (low != IWL_RATE_INVALID)
1115 /* Lower rate not available, use the original */
1119 /* Else try to raise the "search" rate to match "active" */
1121 /* (2nd or later pass)
1122 * If we've already tried to lower the rate, and are
1123 * now trying to raise it, use the lower rate. */
1124 if (new_rate != IWL_RATE_INVALID)
1127 /* Loop again with higher rate */
1128 else if (high != IWL_RATE_INVALID) {
1132 /* Higher rate not available, use the original */
1143 * Set up search table for MIMO
1145 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1146 struct iwl4965_lq_sta *lq_sta,
1147 struct ieee80211_conf *conf,
1148 struct sta_info *sta,
1149 struct iwl4965_scale_tbl_info *tbl, int index)
1153 s8 is_green = lq_sta->is_green;
1155 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1156 !sta->ht_info.ht_supported)
1159 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1162 /* Need both Tx chains/antennas to support MIMO */
1163 if (priv->hw_params.tx_chains_num < 2)
1166 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1168 tbl->lq_type = LQ_MIMO2;
1169 tbl->is_dup = lq_sta->is_dup;
1171 rate_mask = lq_sta->active_mimo2_rate;
1173 if (priv->current_ht_config.supported_chan_width
1174 == IWL_CHANNEL_WIDTH_40MHZ)
1179 /* FIXME: - don't toggle SGI here
1181 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1185 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1191 rs_set_expected_tpt_table(lq_sta, tbl);
1193 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1195 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1197 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1198 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1202 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1204 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1205 tbl->current_rate, is_green);
1210 * Set up search table for SISO
1212 static int rs_switch_to_siso(struct iwl_priv *priv,
1213 struct iwl4965_lq_sta *lq_sta,
1214 struct ieee80211_conf *conf,
1215 struct sta_info *sta,
1216 struct iwl4965_scale_tbl_info *tbl, int index)
1219 u8 is_green = lq_sta->is_green;
1222 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1223 !sta->ht_info.ht_supported)
1226 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1228 tbl->is_dup = lq_sta->is_dup;
1229 tbl->lq_type = LQ_SISO;
1231 rate_mask = lq_sta->active_siso_rate;
1233 if (priv->current_ht_config.supported_chan_width
1234 == IWL_CHANNEL_WIDTH_40MHZ)
1239 /* FIXME: - don't toggle SGI here
1241 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1245 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1252 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1254 rs_set_expected_tpt_table(lq_sta, tbl);
1255 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1257 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1258 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1259 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1263 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1264 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1265 tbl->current_rate, is_green);
1270 * Try to switch to new modulation mode from legacy
1272 static int rs_move_legacy_other(struct iwl_priv *priv,
1273 struct iwl4965_lq_sta *lq_sta,
1274 struct ieee80211_conf *conf,
1275 struct sta_info *sta,
1278 struct iwl4965_scale_tbl_info *tbl =
1279 &(lq_sta->lq_info[lq_sta->active_tbl]);
1280 struct iwl4965_scale_tbl_info *search_tbl =
1281 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1282 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1283 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1284 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1285 u8 start_action = tbl->action;
1286 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1290 switch (tbl->action) {
1291 case IWL_LEGACY_SWITCH_ANTENNA:
1292 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1294 lq_sta->action_counter++;
1296 /* Don't change antenna if success has been great */
1297 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1300 /* Set up search table to try other antenna */
1301 memcpy(search_tbl, tbl, sz);
1303 if (rs_toggle_antenna(valid_tx_ant,
1304 &search_tbl->current_rate, search_tbl)) {
1305 lq_sta->search_better_tbl = 1;
1309 case IWL_LEGACY_SWITCH_SISO:
1310 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1312 /* Set up search table to try SISO */
1313 memcpy(search_tbl, tbl, sz);
1314 search_tbl->is_SGI = 0;
1315 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1318 lq_sta->search_better_tbl = 1;
1319 lq_sta->action_counter = 0;
1324 case IWL_LEGACY_SWITCH_MIMO2:
1325 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1327 /* Set up search table to try MIMO */
1328 memcpy(search_tbl, tbl, sz);
1329 search_tbl->is_SGI = 0;
1330 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1331 /*FIXME:RS:need to check ant validity*/
1332 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1335 lq_sta->search_better_tbl = 1;
1336 lq_sta->action_counter = 0;
1342 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1343 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1345 if (tbl->action == start_action)
1353 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1354 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1360 * Try to switch to new modulation mode from SISO
1362 static int rs_move_siso_to_other(struct iwl_priv *priv,
1363 struct iwl4965_lq_sta *lq_sta,
1364 struct ieee80211_conf *conf,
1365 struct sta_info *sta,
1368 u8 is_green = lq_sta->is_green;
1369 struct iwl4965_scale_tbl_info *tbl =
1370 &(lq_sta->lq_info[lq_sta->active_tbl]);
1371 struct iwl4965_scale_tbl_info *search_tbl =
1372 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1373 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1374 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1375 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1376 u8 start_action = tbl->action;
1377 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1381 lq_sta->action_counter++;
1382 switch (tbl->action) {
1383 case IWL_SISO_SWITCH_ANTENNA:
1384 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
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)) {
1391 lq_sta->search_better_tbl = 1;
1395 case IWL_SISO_SWITCH_MIMO2:
1396 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1397 memcpy(search_tbl, tbl, sz);
1398 search_tbl->is_SGI = 0;
1399 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1400 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1403 lq_sta->search_better_tbl = 1;
1407 case IWL_SISO_SWITCH_GI:
1409 !(priv->current_ht_config.sgf &
1413 !(priv->current_ht_config.sgf &
1417 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1419 memcpy(search_tbl, tbl, sz);
1424 IWL_ERROR("SGI was set in GF+SISO\n");
1426 search_tbl->is_SGI = !tbl->is_SGI;
1427 rs_set_expected_tpt_table(lq_sta, search_tbl);
1429 s32 tpt = lq_sta->last_tpt / 100;
1430 if (tpt >= search_tbl->expected_tpt[index])
1433 search_tbl->current_rate = rate_n_flags_from_tbl(
1434 search_tbl, index, is_green);
1435 lq_sta->search_better_tbl = 1;
1439 if (tbl->action > IWL_SISO_SWITCH_GI)
1440 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1442 if (tbl->action == start_action)
1449 if (tbl->action > IWL_SISO_SWITCH_GI)
1450 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1455 * Try to switch to new modulation mode from MIMO
1457 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1458 struct iwl4965_lq_sta *lq_sta,
1459 struct ieee80211_conf *conf,
1460 struct sta_info *sta,
1463 s8 is_green = lq_sta->is_green;
1464 struct iwl4965_scale_tbl_info *tbl =
1465 &(lq_sta->lq_info[lq_sta->active_tbl]);
1466 struct iwl4965_scale_tbl_info *search_tbl =
1467 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1468 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1469 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1470 u8 start_action = tbl->action;
1471 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1475 lq_sta->action_counter++;
1476 switch (tbl->action) {
1477 case IWL_MIMO_SWITCH_ANTENNA_A:
1478 case IWL_MIMO_SWITCH_ANTENNA_B:
1479 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1481 /* Set up new search table for SISO */
1482 memcpy(search_tbl, tbl, sz);
1484 /*FIXME:RS:need to check ant validity + C*/
1485 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1486 search_tbl->ant_type = ANT_A;
1488 search_tbl->ant_type = ANT_B;
1490 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1493 lq_sta->search_better_tbl = 1;
1498 case IWL_MIMO_SWITCH_GI:
1500 !(priv->current_ht_config.sgf &
1504 !(priv->current_ht_config.sgf &
1508 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1510 /* Set up new search table for MIMO */
1511 memcpy(search_tbl, tbl, sz);
1512 search_tbl->is_SGI = !tbl->is_SGI;
1513 rs_set_expected_tpt_table(lq_sta, search_tbl);
1515 * If active table already uses the fastest possible
1516 * modulation (dual stream with short guard interval),
1517 * and it's working well, there's no need to look
1518 * for a better type of modulation!
1521 s32 tpt = lq_sta->last_tpt / 100;
1522 if (tpt >= search_tbl->expected_tpt[index])
1525 search_tbl->current_rate = rate_n_flags_from_tbl(
1526 search_tbl, index, is_green);
1527 lq_sta->search_better_tbl = 1;
1532 if (tbl->action > IWL_MIMO_SWITCH_GI)
1533 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1535 if (tbl->action == start_action)
1542 if (tbl->action > IWL_MIMO_SWITCH_GI)
1543 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1549 * Check whether we should continue using same modulation mode, or
1550 * begin search for a new mode, based on:
1551 * 1) # tx successes or failures while using this mode
1552 * 2) # times calling this function
1553 * 3) elapsed time in this mode (not used, for now)
1555 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1557 struct iwl4965_scale_tbl_info *tbl;
1560 int flush_interval_passed = 0;
1561 struct iwl_priv *priv;
1564 active_tbl = lq_sta->active_tbl;
1566 tbl = &(lq_sta->lq_info[active_tbl]);
1568 /* If we've been disallowing search, see if we should now allow it */
1569 if (lq_sta->stay_in_tbl) {
1571 /* Elapsed time using current modulation mode */
1572 if (lq_sta->flush_timer)
1573 flush_interval_passed =
1575 (unsigned long)(lq_sta->flush_timer +
1576 IWL_RATE_SCALE_FLUSH_INTVL));
1579 * Check if we should allow search for new modulation mode.
1580 * If many frames have failed or succeeded, or we've used
1581 * this same modulation for a long time, allow search, and
1582 * reset history stats that keep track of whether we should
1583 * allow a new search. Also (below) reset all bitmaps and
1584 * stats in active history.
1586 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1587 (lq_sta->total_success > lq_sta->max_success_limit) ||
1588 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1589 && (flush_interval_passed))) {
1590 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1591 lq_sta->total_failed,
1592 lq_sta->total_success,
1593 flush_interval_passed);
1595 /* Allow search for new mode */
1596 lq_sta->stay_in_tbl = 0; /* only place reset */
1597 lq_sta->total_failed = 0;
1598 lq_sta->total_success = 0;
1599 lq_sta->flush_timer = 0;
1602 * Else if we've used this modulation mode enough repetitions
1603 * (regardless of elapsed time or success/failure), reset
1604 * history bitmaps and rate-specific stats for all rates in
1608 lq_sta->table_count++;
1609 if (lq_sta->table_count >=
1610 lq_sta->table_count_limit) {
1611 lq_sta->table_count = 0;
1613 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1614 for (i = 0; i < IWL_RATE_COUNT; i++)
1615 rs_rate_scale_clear_window(
1620 /* If transitioning to allow "search", reset all history
1621 * bitmaps and stats in active table (this will become the new
1622 * "search" table). */
1623 if (!lq_sta->stay_in_tbl) {
1624 for (i = 0; i < IWL_RATE_COUNT; i++)
1625 rs_rate_scale_clear_window(&(tbl->win[i]));
1631 * Do rate scaling and search for new modulation mode.
1633 static void rs_rate_scale_perform(struct iwl_priv *priv,
1634 struct net_device *dev,
1635 struct ieee80211_hdr *hdr,
1636 struct sta_info *sta)
1638 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1639 struct ieee80211_hw *hw = local_to_hw(local);
1640 struct ieee80211_conf *conf = &hw->conf;
1641 int low = IWL_RATE_INVALID;
1642 int high = IWL_RATE_INVALID;
1645 struct iwl4965_rate_scale_data *window = NULL;
1646 int current_tpt = IWL_INVALID_VALUE;
1647 int low_tpt = IWL_INVALID_VALUE;
1648 int high_tpt = IWL_INVALID_VALUE;
1650 s8 scale_action = 0;
1653 struct iwl4965_lq_sta *lq_sta;
1654 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1655 u16 rate_scale_index_msk = 0;
1662 u8 tid = MAX_TID_COUNT;
1664 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1666 fc = le16_to_cpu(hdr->frame_control);
1667 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1668 /* Send management frames and broadcast/multicast data using
1670 /* TODO: this could probably be improved.. */
1674 if (!sta || !sta->rate_ctrl_priv)
1677 if (!priv->lq_mngr.lq_ready) {
1678 IWL_DEBUG_RATE("still rate scaling not ready\n");
1681 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1683 rs_tl_add_packet(lq_sta, hdr);
1685 * Select rate-scale / modulation-mode table to work with in
1686 * the rest of this function: "search" if searching for better
1687 * modulation mode, or "active" if doing rate scaling within a mode.
1689 if (!lq_sta->search_better_tbl)
1690 active_tbl = lq_sta->active_tbl;
1692 active_tbl = 1 - lq_sta->active_tbl;
1694 tbl = &(lq_sta->lq_info[active_tbl]);
1695 is_green = lq_sta->is_green;
1697 /* current tx rate */
1698 index = sta->last_txrate_idx;
1700 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1703 /* rates available for this association, and for modulation mode */
1704 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1706 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1708 /* mask with station rate restriction */
1709 if (is_legacy(tbl->lq_type)) {
1710 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1711 /* supp_rates has no CCK bits in A mode */
1712 rate_scale_index_msk = (u16) (rate_mask &
1713 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1715 rate_scale_index_msk = (u16) (rate_mask &
1716 lq_sta->supp_rates);
1719 rate_scale_index_msk = rate_mask;
1721 if (!rate_scale_index_msk)
1722 rate_scale_index_msk = rate_mask;
1724 if (!((1 << index) & rate_scale_index_msk)) {
1725 IWL_ERROR("Current Rate is not valid\n");
1729 /* Get expected throughput table and history window for current rate */
1730 if (!tbl->expected_tpt) {
1731 IWL_ERROR("tbl->expected_tpt is NULL\n");
1735 window = &(tbl->win[index]);
1738 * If there is not enough history to calculate actual average
1739 * throughput, keep analyzing results of more tx frames, without
1740 * changing rate or mode (bypass most of the rest of this function).
1741 * Set up new rate table in uCode only if old rate is not supported
1742 * in current association (use new rate found above).
1744 fail_count = window->counter - window->success_counter;
1745 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1746 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1747 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1749 window->success_counter, window->counter, index);
1751 /* Can't calculate this yet; not enough history */
1752 window->average_tpt = IWL_INVALID_VALUE;
1754 /* Should we stay with this modulation mode,
1755 * or search for a new one? */
1756 rs_stay_in_table(lq_sta);
1760 /* Else we have enough samples; calculate estimate of
1761 * actual average throughput */
1763 /*FIXME:RS remove this else if we don't get this error*/
1764 if (window->average_tpt != ((window->success_ratio *
1765 tbl->expected_tpt[index] + 64) / 128)) {
1766 IWL_ERROR("expected_tpt should have been calculated"
1768 window->average_tpt = ((window->success_ratio *
1769 tbl->expected_tpt[index] + 64) / 128);
1773 /* If we are searching for better modulation mode, check success. */
1774 if (lq_sta->search_better_tbl) {
1776 /* If good success, continue using the "search" mode;
1777 * no need to send new link quality command, since we're
1778 * continuing to use the setup that we've been trying. */
1779 if (window->average_tpt > lq_sta->last_tpt) {
1781 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1782 "suc=%d cur-tpt=%d old-tpt=%d\n",
1783 window->success_ratio,
1784 window->average_tpt,
1787 if (!is_legacy(tbl->lq_type))
1788 lq_sta->enable_counter = 1;
1790 /* Swap tables; "search" becomes "active" */
1791 lq_sta->active_tbl = active_tbl;
1792 current_tpt = window->average_tpt;
1794 /* Else poor success; go back to mode in "active" table */
1797 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1798 "suc=%d cur-tpt=%d old-tpt=%d\n",
1799 window->success_ratio,
1800 window->average_tpt,
1803 /* Nullify "search" table */
1804 tbl->lq_type = LQ_NONE;
1806 /* Revert to "active" table */
1807 active_tbl = lq_sta->active_tbl;
1808 tbl = &(lq_sta->lq_info[active_tbl]);
1810 /* Revert to "active" rate and throughput info */
1811 index = iwl4965_hwrate_to_plcp_idx(
1813 current_tpt = lq_sta->last_tpt;
1815 /* Need to set up a new rate table in uCode */
1819 /* Either way, we've made a decision; modulation mode
1820 * search is done, allow rate adjustment next time. */
1821 lq_sta->search_better_tbl = 0;
1822 done_search = 1; /* Don't switch modes below! */
1826 /* (Else) not in search of better modulation mode, try for better
1827 * starting rate, while staying in this mode. */
1828 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1830 low = high_low & 0xff;
1831 high = (high_low >> 8) & 0xff;
1833 sr = window->success_ratio;
1835 /* Collect measured throughputs for current and adjacent rates */
1836 current_tpt = window->average_tpt;
1837 if (low != IWL_RATE_INVALID)
1838 low_tpt = tbl->win[low].average_tpt;
1839 if (high != IWL_RATE_INVALID)
1840 high_tpt = tbl->win[high].average_tpt;
1844 /* Too many failures, decrease rate */
1845 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1846 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1849 /* No throughput measured yet for adjacent rates; try increase. */
1850 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1851 (high_tpt == IWL_INVALID_VALUE)) {
1853 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1855 else if (low != IWL_RATE_INVALID)
1859 /* Both adjacent throughputs are measured, but neither one has better
1860 * throughput; we're using the best rate, don't change it! */
1861 else if ((low_tpt != IWL_INVALID_VALUE) &&
1862 (high_tpt != IWL_INVALID_VALUE) &&
1863 (low_tpt < current_tpt) &&
1864 (high_tpt < current_tpt))
1867 /* At least one adjacent rate's throughput is measured,
1868 * and may have better performance. */
1870 /* Higher adjacent rate's throughput is measured */
1871 if (high_tpt != IWL_INVALID_VALUE) {
1872 /* Higher rate has better throughput */
1873 if (high_tpt > current_tpt &&
1874 sr >= IWL_RATE_INCREASE_TH) {
1878 ("decrease rate because of high tpt\n");
1882 /* Lower adjacent rate's throughput is measured */
1883 } else if (low_tpt != IWL_INVALID_VALUE) {
1884 /* Lower rate has better throughput */
1885 if (low_tpt > current_tpt) {
1887 ("decrease rate because of low tpt\n");
1889 } else if (sr >= IWL_RATE_INCREASE_TH) {
1895 /* Sanity check; asked for decrease, but success rate or throughput
1896 * has been good at old rate. Don't change it. */
1897 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1898 ((sr > IWL_RATE_HIGH_TH) ||
1899 (current_tpt > (100 * tbl->expected_tpt[low]))))
1902 switch (scale_action) {
1904 /* Decrease starting rate, update uCode's rate table */
1905 if (low != IWL_RATE_INVALID) {
1911 /* Increase starting rate, update uCode's rate table */
1912 if (high != IWL_RATE_INVALID) {
1924 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1925 "high %d type %d\n",
1926 index, scale_action, low, high, tbl->lq_type);
1929 /* Replace uCode's rate table for the destination station. */
1931 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1932 rs_fill_link_cmd(priv, lq_sta, rate);
1933 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1936 /* Should we stay with this modulation mode, or search for a new one? */
1937 rs_stay_in_table(lq_sta);
1940 * Search for new modulation mode if we're:
1941 * 1) Not changing rates right now
1942 * 2) Not just finishing up a search
1943 * 3) Allowing a new search
1945 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1946 /* Save current throughput to compare with "search" throughput*/
1947 lq_sta->last_tpt = current_tpt;
1949 /* Select a new "search" modulation mode to try.
1950 * If one is found, set up the new "search" table. */
1951 if (is_legacy(tbl->lq_type))
1952 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1953 else if (is_siso(tbl->lq_type))
1954 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1956 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1958 /* If new "search" mode was selected, set up in uCode table */
1959 if (lq_sta->search_better_tbl) {
1960 /* Access the "search" table, clear its history. */
1961 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1962 for (i = 0; i < IWL_RATE_COUNT; i++)
1963 rs_rate_scale_clear_window(&(tbl->win[i]));
1965 /* Use new "search" start rate */
1966 index = iwl4965_hwrate_to_plcp_idx(
1969 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1970 tbl->current_rate, index);
1971 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1972 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1975 /* If the "active" (non-search) mode was legacy,
1976 * and we've tried switching antennas,
1977 * but we haven't been able to try HT modes (not available),
1978 * stay with best antenna legacy modulation for a while
1979 * before next round of mode comparisons. */
1980 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1981 if (is_legacy(tbl1->lq_type) &&
1982 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1983 (lq_sta->action_counter >= 1)) {
1984 lq_sta->action_counter = 0;
1985 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1986 rs_set_stay_in_table(priv, 1, lq_sta);
1989 /* If we're in an HT mode, and all 3 mode switch actions
1990 * have been tried and compared, stay in this best modulation
1991 * mode for a while before next round of mode comparisons. */
1992 if (lq_sta->enable_counter &&
1993 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1994 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1995 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1996 (tid != MAX_TID_COUNT)) {
1997 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
1998 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2000 lq_sta->action_counter = 0;
2001 rs_set_stay_in_table(priv, 0, lq_sta);
2005 * Else, don't search for a new modulation mode.
2006 * Put new timestamp in stay-in-modulation-mode flush timer if:
2007 * 1) Not changing rates right now
2008 * 2) Not just finishing up a search
2009 * 3) flush timer is empty
2012 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2013 lq_sta->flush_timer = jiffies;
2017 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2019 sta->last_txrate_idx = i;
2021 /* sta->txrate_idx is an index to A mode rates which start
2022 * at IWL_FIRST_OFDM_RATE
2024 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2025 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2027 sta->txrate_idx = i;
2033 static void rs_initialize_lq(struct iwl_priv *priv,
2034 struct ieee80211_conf *conf,
2035 struct sta_info *sta)
2037 struct iwl4965_lq_sta *lq_sta;
2038 struct iwl4965_scale_tbl_info *tbl;
2042 u8 use_green = rs_use_green(priv, conf);
2046 if (!sta || !sta->rate_ctrl_priv)
2049 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2050 i = sta->last_txrate_idx;
2052 if ((lq_sta->lq.sta_id == 0xff) &&
2053 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2056 valid_tx_ant = priv->hw_params.valid_tx_ant;
2058 if (!lq_sta->search_better_tbl)
2059 active_tbl = lq_sta->active_tbl;
2061 active_tbl = 1 - lq_sta->active_tbl;
2063 tbl = &(lq_sta->lq_info[active_tbl]);
2065 if ((i < 0) || (i >= IWL_RATE_COUNT))
2068 /* FIXME:RS: This is also wrong in 4965 */
2069 rate = iwl_rates[i].plcp;
2070 rate |= RATE_MCS_ANT_B_MSK;
2071 rate &= ~RATE_MCS_ANT_A_MSK;
2073 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2074 rate |= RATE_MCS_CCK_MSK;
2076 tbl->ant_type = ANT_B;
2077 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2078 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2079 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2081 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2082 tbl->current_rate = rate;
2083 rs_set_expected_tpt_table(lq_sta, tbl);
2084 rs_fill_link_cmd(NULL, lq_sta, rate);
2085 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2090 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2091 struct ieee80211_supported_band *sband,
2092 struct sk_buff *skb,
2093 struct rate_selection *sel)
2097 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2098 struct ieee80211_conf *conf = &local->hw.conf;
2099 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2100 struct sta_info *sta;
2102 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2103 struct iwl4965_lq_sta *lq_sta;
2105 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2109 sta = sta_info_get(local, hdr->addr1);
2111 /* Send management frames and broadcast/multicast data using lowest
2113 fc = le16_to_cpu(hdr->frame_control);
2114 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2115 !sta || !sta->rate_ctrl_priv) {
2116 sel->rate_idx = rate_lowest_index(local, sband, sta);
2120 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2121 i = sta->last_txrate_idx;
2123 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2124 !lq_sta->ibss_sta_added) {
2125 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2126 DECLARE_MAC_BUF(mac);
2128 if (sta_id == IWL_INVALID_STATION) {
2129 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2130 print_mac(mac, hdr->addr1));
2131 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2132 0, CMD_ASYNC, NULL);
2134 if ((sta_id != IWL_INVALID_STATION)) {
2135 lq_sta->lq.sta_id = sta_id;
2136 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2137 lq_sta->ibss_sta_added = 1;
2138 rs_initialize_lq(priv, conf, sta);
2140 if (!lq_sta->ibss_sta_added)
2145 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2146 sel->rate_idx = rate_lowest_index(local, sband, sta);
2150 if (sband->band == IEEE80211_BAND_5GHZ)
2151 i -= IWL_FIRST_OFDM_RATE;
2157 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2159 struct iwl4965_lq_sta *lq_sta;
2160 struct iwl_priv *priv;
2163 priv = (struct iwl_priv *)priv_rate;
2164 IWL_DEBUG_RATE("create station rate scale window\n");
2166 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2170 lq_sta->lq.sta_id = 0xff;
2173 for (j = 0; j < LQ_SIZE; j++)
2174 for (i = 0; i < IWL_RATE_COUNT; i++)
2175 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2180 static void rs_rate_init(void *priv_rate, void *priv_sta,
2181 struct ieee80211_local *local,
2182 struct sta_info *sta)
2185 struct ieee80211_conf *conf = &local->hw.conf;
2186 struct ieee80211_supported_band *sband;
2187 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2188 struct iwl4965_lq_sta *lq_sta = priv_sta;
2190 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2192 lq_sta->flush_timer = 0;
2193 lq_sta->supp_rates = sta->supp_rates[sband->band];
2194 sta->txrate_idx = 3;
2195 for (j = 0; j < LQ_SIZE; j++)
2196 for (i = 0; i < IWL_RATE_COUNT; i++)
2197 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2199 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2200 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2201 * the lowest or the highest rate.. Could consider using RSSI from
2202 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2205 lq_sta->ibss_sta_added = 0;
2206 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2207 u8 sta_id = iwl_find_station(priv, sta->addr);
2208 DECLARE_MAC_BUF(mac);
2210 /* for IBSS the call are from tasklet */
2211 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2212 print_mac(mac, sta->addr));
2214 if (sta_id == IWL_INVALID_STATION) {
2215 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2216 print_mac(mac, sta->addr));
2217 sta_id = iwl_add_station_flags(priv, sta->addr,
2218 0, CMD_ASYNC, NULL);
2220 if ((sta_id != IWL_INVALID_STATION)) {
2221 lq_sta->lq.sta_id = sta_id;
2222 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2224 /* FIXME: this is w/a remove it later */
2225 priv->assoc_station_added = 1;
2228 /* Find highest tx rate supported by hardware and destination station */
2229 for (i = 0; i < sband->n_bitrates; i++)
2230 if (sta->supp_rates[sband->band] & BIT(i))
2231 sta->txrate_idx = i;
2233 sta->last_txrate_idx = sta->txrate_idx;
2234 /* WTF is with this bogus comment? A doesn't have cck rates */
2235 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2236 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2237 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2240 lq_sta->is_green = rs_use_green(priv, conf);
2241 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2242 lq_sta->active_rate_basic = priv->active_rate_basic;
2243 lq_sta->band = priv->band;
2245 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2246 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2248 lq_sta->active_siso_rate =
2249 priv->current_ht_config.supp_mcs_set[0] << 1;
2250 lq_sta->active_siso_rate |=
2251 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2252 lq_sta->active_siso_rate &= ~((u16)0x2);
2253 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2256 lq_sta->active_mimo2_rate =
2257 priv->current_ht_config.supp_mcs_set[1] << 1;
2258 lq_sta->active_mimo2_rate |=
2259 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2260 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2261 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2263 lq_sta->active_mimo3_rate =
2264 priv->current_ht_config.supp_mcs_set[2] << 1;
2265 lq_sta->active_mimo3_rate |=
2266 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2267 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2268 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2270 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2271 lq_sta->active_siso_rate,
2272 lq_sta->active_mimo2_rate,
2273 lq_sta->active_mimo3_rate);
2275 /* These values will be overriden later */
2276 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2277 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2279 /* as default allow aggregation for all tids */
2280 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2281 #ifdef CONFIG_MAC80211_DEBUGFS
2285 if (priv->assoc_station_added)
2286 priv->lq_mngr.lq_ready = 1;
2288 rs_initialize_lq(priv, conf, sta);
2291 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2292 struct iwl4965_lq_sta *lq_sta,
2295 struct iwl4965_scale_tbl_info tbl_type;
2298 int repeat_rate = 0;
2299 u8 ant_toggle_cnt = 0;
2300 u8 use_ht_possible = 1;
2301 u8 valid_tx_ant = 0;
2302 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2304 /* Override starting rate (index 0) if needed for debug purposes */
2305 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2307 /* Interpret new_rate (rate_n_flags) */
2308 memset(&tbl_type, 0, sizeof(tbl_type));
2309 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2310 &tbl_type, &rate_idx);
2312 /* How many times should we repeat the initial rate? */
2313 if (is_legacy(tbl_type.lq_type)) {
2315 repeat_rate = IWL_NUMBER_TRY;
2317 repeat_rate = IWL_HT_NUMBER_TRY;
2320 lq_cmd->general_params.mimo_delimiter =
2321 is_mimo(tbl_type.lq_type) ? 1 : 0;
2323 /* Fill 1st table entry (index 0) */
2324 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2326 if (num_of_ant(tbl_type.ant_type) == 1) {
2327 lq_cmd->general_params.single_stream_ant_msk =
2329 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2330 lq_cmd->general_params.dual_stream_ant_msk =
2332 } /* otherwise we don't modify the existing value */
2338 valid_tx_ant = priv->hw_params.valid_tx_ant;
2340 /* Fill rest of rate table */
2341 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2342 /* Repeat initial/next rate.
2343 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2344 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2345 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2346 if (is_legacy(tbl_type.lq_type)) {
2347 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2350 rs_toggle_antenna(valid_tx_ant,
2351 &new_rate, &tbl_type))
2355 /* Override next rate if needed for debug purposes */
2356 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2358 /* Fill next table entry */
2359 lq_cmd->rs_table[index].rate_n_flags =
2360 cpu_to_le32(new_rate);
2365 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2368 /* Indicate to uCode which entries might be MIMO.
2369 * If initial rate was MIMO, this will finally end up
2370 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2371 if (is_mimo(tbl_type.lq_type))
2372 lq_cmd->general_params.mimo_delimiter = index;
2375 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2378 /* How many times should we repeat the next rate? */
2379 if (is_legacy(tbl_type.lq_type)) {
2380 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2383 rs_toggle_antenna(valid_tx_ant,
2384 &new_rate, &tbl_type))
2387 repeat_rate = IWL_NUMBER_TRY;
2389 repeat_rate = IWL_HT_NUMBER_TRY;
2392 /* Don't allow HT rates after next pass.
2393 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2394 use_ht_possible = 0;
2396 /* Override next rate if needed for debug purposes */
2397 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2399 /* Fill next table entry */
2400 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2406 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2407 lq_cmd->agg_params.agg_dis_start_th = 3;
2408 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2411 static void *rs_alloc(struct ieee80211_local *local)
2413 return local->hw.priv;
2415 /* rate scale requires free function to be implemented */
2416 static void rs_free(void *priv_rate)
2421 static void rs_clear(void *priv_rate)
2423 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2425 IWL_DEBUG_RATE("enter\n");
2427 priv->lq_mngr.lq_ready = 0;
2429 IWL_DEBUG_RATE("leave\n");
2432 static void rs_free_sta(void *priv_rate, void *priv_sta)
2434 struct iwl4965_lq_sta *lq_sta = priv_sta;
2435 struct iwl_priv *priv;
2437 priv = (struct iwl_priv *)priv_rate;
2438 IWL_DEBUG_RATE("enter\n");
2440 IWL_DEBUG_RATE("leave\n");
2444 #ifdef CONFIG_MAC80211_DEBUGFS
2445 static int open_file_generic(struct inode *inode, struct file *file)
2447 file->private_data = inode->i_private;
2450 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2451 u32 *rate_n_flags, int index)
2453 struct iwl_priv *priv;
2456 if (lq_sta->dbg_fixed_rate) {
2458 *rate_n_flags = lq_sta->dbg_fixed_rate;
2460 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2461 *rate_n_flags = 0x800D;
2463 *rate_n_flags = 0x820A;
2465 IWL_DEBUG_RATE("Fixed rate ON\n");
2467 IWL_DEBUG_RATE("Fixed rate OFF\n");
2471 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2472 const char __user *user_buf, size_t count, loff_t *ppos)
2474 struct iwl4965_lq_sta *lq_sta = file->private_data;
2475 struct iwl_priv *priv;
2481 memset(buf, 0, sizeof(buf));
2482 buf_size = min(count, sizeof(buf) - 1);
2483 if (copy_from_user(buf, user_buf, buf_size))
2486 if (sscanf(buf, "%x", &parsed_rate) == 1)
2487 lq_sta->dbg_fixed_rate = parsed_rate;
2489 lq_sta->dbg_fixed_rate = 0;
2491 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2492 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2493 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2494 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2496 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2497 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2499 if (lq_sta->dbg_fixed_rate) {
2500 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2501 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2507 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2508 char __user *user_buf, size_t count, loff_t *ppos)
2514 struct iwl4965_lq_sta *lq_sta = file->private_data;
2516 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2517 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2518 lq_sta->total_failed, lq_sta->total_success,
2519 lq_sta->active_legacy_rate);
2520 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2521 lq_sta->dbg_fixed_rate);
2522 desc += sprintf(buff+desc, "general:"
2523 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2524 lq_sta->lq.general_params.flags,
2525 lq_sta->lq.general_params.mimo_delimiter,
2526 lq_sta->lq.general_params.single_stream_ant_msk,
2527 lq_sta->lq.general_params.dual_stream_ant_msk);
2529 desc += sprintf(buff+desc, "agg:"
2530 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2531 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2532 lq_sta->lq.agg_params.agg_dis_start_th,
2533 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2535 desc += sprintf(buff+desc,
2536 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2537 lq_sta->lq.general_params.start_rate_index[0],
2538 lq_sta->lq.general_params.start_rate_index[1],
2539 lq_sta->lq.general_params.start_rate_index[2],
2540 lq_sta->lq.general_params.start_rate_index[3]);
2543 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2544 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2545 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2547 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2550 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2551 .write = rs_sta_dbgfs_scale_table_write,
2552 .read = rs_sta_dbgfs_scale_table_read,
2553 .open = open_file_generic,
2555 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2556 char __user *user_buf, size_t count, loff_t *ppos)
2562 struct iwl4965_lq_sta *lq_sta = file->private_data;
2563 for (i = 0; i < LQ_SIZE; i++) {
2564 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2566 lq_sta->active_tbl == i?"*":"x",
2567 lq_sta->lq_info[i].lq_type,
2568 lq_sta->lq_info[i].is_SGI,
2569 lq_sta->lq_info[i].is_fat,
2570 lq_sta->lq_info[i].is_dup,
2571 lq_sta->lq_info[i].current_rate);
2572 for (j = 0; j < IWL_RATE_COUNT; j++) {
2573 desc += sprintf(buff+desc,
2574 "counter=%d success=%d %%=%d\n",
2575 lq_sta->lq_info[i].win[j].counter,
2576 lq_sta->lq_info[i].win[j].success_counter,
2577 lq_sta->lq_info[i].win[j].success_ratio);
2580 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2583 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2584 .read = rs_sta_dbgfs_stats_table_read,
2585 .open = open_file_generic,
2588 static void rs_add_debugfs(void *priv, void *priv_sta,
2591 struct iwl4965_lq_sta *lq_sta = priv_sta;
2592 lq_sta->rs_sta_dbgfs_scale_table_file =
2593 debugfs_create_file("rate_scale_table", 0600, dir,
2594 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2595 lq_sta->rs_sta_dbgfs_stats_table_file =
2596 debugfs_create_file("rate_stats_table", 0600, dir,
2597 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2598 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2599 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2600 &lq_sta->tx_agg_tid_en);
2604 static void rs_remove_debugfs(void *priv, void *priv_sta)
2606 struct iwl4965_lq_sta *lq_sta = priv_sta;
2607 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2608 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2609 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2613 static struct rate_control_ops rs_ops = {
2616 .tx_status = rs_tx_status,
2617 .get_rate = rs_get_rate,
2618 .rate_init = rs_rate_init,
2622 .alloc_sta = rs_alloc_sta,
2623 .free_sta = rs_free_sta,
2624 #ifdef CONFIG_MAC80211_DEBUGFS
2625 .add_sta_debugfs = rs_add_debugfs,
2626 .remove_sta_debugfs = rs_remove_debugfs,
2630 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2632 struct ieee80211_local *local = hw_to_local(hw);
2633 struct iwl_priv *priv = hw->priv;
2634 struct iwl4965_lq_sta *lq_sta;
2635 struct sta_info *sta;
2637 u32 samples = 0, success = 0, good = 0;
2638 unsigned long now = jiffies;
2640 u8 lq_type, antenna;
2644 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2645 if (!sta || !sta->rate_ctrl_priv) {
2647 IWL_DEBUG_RATE("leave - no private rate data!\n");
2649 IWL_DEBUG_RATE("leave - no station!\n");
2651 return sprintf(buf, "station %d not found\n", sta_id);
2654 lq_sta = (void *)sta->rate_ctrl_priv;
2656 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2657 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2659 if (is_legacy(lq_type))
2660 i = IWL_RATE_54M_INDEX;
2662 i = IWL_RATE_60M_INDEX;
2666 int active = lq_sta->active_tbl;
2669 sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2671 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2672 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2674 (lq_sta->lq_info[active].win[i].data & mask)
2677 samples += lq_sta->lq_info[active].win[i].counter;
2678 good += lq_sta->lq_info[active].win[i].success_counter;
2679 success += lq_sta->lq_info[active].win[i].success_counter *
2682 if (lq_sta->lq_info[active].win[i].stamp) {
2684 jiffies_to_msecs(now -
2685 lq_sta->lq_info[active].win[i].stamp);
2687 if (delta > max_time)
2690 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2694 j = iwl4965_get_prev_ieee_rate(i);
2701 * Display the average rate of all samples taken.
2702 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2703 * added from iwl_rates is actually 2X the rate.
2706 cnt += sprintf(&buf[cnt],
2707 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2708 "%3d%% success (%d good packets over %d tries)\n",
2709 success / (2 * samples), (success * 5 / samples) % 10,
2710 max_time, good * 100 / samples, good, samples);
2712 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2714 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2715 "active_search %d rate index %d\n", lq_type, antenna,
2716 lq_sta->search_better_tbl, sta->last_txrate_idx);
2722 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2724 struct iwl_priv *priv = hw->priv;
2726 priv->lq_mngr.lq_ready = 1;
2729 int iwl4965_rate_control_register(void)
2731 return ieee80211_rate_control_register(&rs_ops);
2734 void iwl4965_rate_control_unregister(void)
2736 ieee80211_rate_control_unregister(&rs_ops);