1 /******************************************************************************
3 * Copyright(c) 2005 - 2007 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>
31 #include <net/ieee80211.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/delay.h>
37 #include <linux/workqueue.h>
39 #include "../net/mac80211/ieee80211_rate.h"
42 #include "iwl-helpers.h"
44 #define RS_NAME "iwl-4965-rs"
46 #define NUM_TRY_BEFORE_ANTENNA_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
69 } __attribute__ ((packed));
72 * struct iwl4965_rate_scale_data -- tx success history for one rate
74 struct iwl4965_rate_scale_data {
75 u64 data; /* bitmap of successful frames */
76 s32 success_counter; /* number of frames successful */
77 s32 success_ratio; /* per-cent * 128 */
78 s32 counter; /* number of frames attempted */
79 s32 average_tpt; /* success ratio * expected throughput */
84 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
86 * There are two of these in struct iwl_rate_scale_priv,
87 * one for "active", and one for "search".
89 struct iwl4965_scale_tbl_info {
90 enum iwl4965_table_type lq_type;
91 enum iwl4965_antenna_type antenna_type;
92 u8 is_SGI; /* 1 = short guard interval */
93 u8 is_fat; /* 1 = 40 MHz channel width */
94 u8 is_dup; /* 1 = duplicated data streams */
95 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
96 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
97 struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
98 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
102 * struct iwl_rate_scale_priv -- driver's rate scaling private structure
104 * Pointer to this gets passed back and forth between driver and mac80211.
106 struct iwl4965_rate_scale_priv {
107 u8 active_tbl; /* index of active table, range 0-1 */
108 u8 enable_counter; /* indicates HT mode */
109 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
110 u8 search_better_tbl; /* 1: currently trying alternate mode */
113 /* The following determine when to search for a new mode */
114 u32 table_count_limit;
115 u32 max_failure_limit; /* # failed frames before new search */
116 u32 max_success_limit; /* # successful frames before new search */
118 u32 total_failed; /* total failed frames, any/all rates */
119 u32 total_success; /* total successful frames, any/all rates */
120 u32 flush_timer; /* time staying in mode before new search */
122 u8 action_counter; /* # mode-switch actions tried */
130 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
133 u16 active_siso_rate;
134 u16 active_mimo_rate;
135 u16 active_rate_basic;
137 struct iwl4965_link_quality_cmd lq;
138 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
139 #ifdef CONFIG_MAC80211_DEBUGFS
140 struct dentry *rs_sta_dbgfs_scale_table_file;
141 struct dentry *rs_sta_dbgfs_stats_table_file;
142 struct iwl4965_rate dbg_fixed;
143 struct iwl4965_priv *drv;
147 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
148 struct net_device *dev,
149 struct ieee80211_hdr *hdr,
150 struct sta_info *sta);
151 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
152 struct iwl4965_rate *tx_mcs,
153 struct iwl4965_link_quality_cmd *tbl);
156 #ifdef CONFIG_MAC80211_DEBUGFS
157 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
158 struct iwl4965_rate *mcs, int index);
160 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
161 struct iwl4965_rate *mcs, int index)
166 * Expected throughput metrics for following rates:
167 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
168 * "G" is the only table that supports CCK (the first 4 rates).
170 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
171 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
174 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
175 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
178 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
179 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
182 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
183 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
186 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
187 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
190 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
191 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
194 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
195 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
198 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
199 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
202 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
203 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
206 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
207 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
210 static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
211 struct iwl4965_cmd *cmd, struct sk_buff *skb)
213 /*We didn't cache the SKB; let the caller free it */
217 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
219 return (u8)(rate_n_flags & 0xFF);
222 static int rs_send_lq_cmd(struct iwl4965_priv *priv,
223 struct iwl4965_link_quality_cmd *lq, u8 flags)
225 #ifdef CONFIG_IWL4965_DEBUG
228 struct iwl4965_host_cmd cmd = {
229 .id = REPLY_TX_LINK_QUALITY_CMD,
230 .len = sizeof(struct iwl4965_link_quality_cmd),
235 if ((lq->sta_id == 0xFF) &&
236 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
239 if (lq->sta_id == 0xFF)
240 lq->sta_id = IWL_AP_ID;
242 IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
243 IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
244 lq->general_params.single_stream_ant_msk,
245 lq->general_params.dual_stream_ant_msk);
246 #ifdef CONFIG_IWL4965_DEBUG
247 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
248 IWL_DEBUG_RATE("lq index %d 0x%X\n",
249 i, lq->rs_table[i].rate_n_flags);
252 if (flags & CMD_ASYNC)
253 cmd.meta.u.callback = iwl4965_lq_sync_callback;
255 if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
256 priv->lq_mngr.lq_ready)
257 return iwl4965_send_cmd(priv, &cmd);
262 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
265 window->success_counter = 0;
266 window->success_ratio = IWL_INVALID_VALUE;
268 window->average_tpt = IWL_INVALID_VALUE;
273 * rs_collect_tx_data - Update the success/failure sliding window
275 * We keep a sliding window of the last 62 packets transmitted
276 * at this rate. window->data contains the bitmask of successful
279 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
280 int scale_index, s32 tpt, u32 status)
282 struct iwl4965_rate_scale_data *window = NULL;
284 u8 win_size = IWL_RATE_MAX_WINDOW;
287 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
290 /* Select data for current tx bit rate */
291 window = &(windows[scale_index]);
294 * Keep track of only the latest 62 tx frame attempts in this rate's
295 * history window; anything older isn't really relevant any more.
296 * If we have filled up the sliding window, drop the oldest attempt;
297 * if the oldest attempt (highest bit in bitmap) shows "success",
298 * subtract "1" from the success counter (this is the main reason
299 * we keep these bitmaps!).
301 if (window->counter >= win_size) {
302 window->counter = win_size - 1;
304 mask = (mask << (win_size - 1));
305 if ((window->data & mask)) {
306 window->data &= ~mask;
307 window->success_counter = window->success_counter - 1;
311 /* Increment frames-attempted counter */
312 window->counter = window->counter + 1;
314 /* Shift bitmap by one frame (throw away oldest history),
315 * OR in "1", and increment "success" if this frame was successful. */
317 window->data = (mask << 1);
319 window->success_counter = window->success_counter + 1;
323 /* Calculate current success ratio, avoid divide-by-0! */
324 if (window->counter > 0)
325 window->success_ratio = 128 * (100 * window->success_counter)
328 window->success_ratio = IWL_INVALID_VALUE;
330 fail_count = window->counter - window->success_counter;
332 /* Calculate average throughput, if we have enough history. */
333 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
334 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
335 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
337 window->average_tpt = IWL_INVALID_VALUE;
339 /* Tag this window as having been updated */
340 window->stamp = jiffies;
346 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
348 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
349 struct iwl4965_scale_tbl_info *tbl,
350 int index, u8 use_green)
352 if (is_legacy(tbl->lq_type)) {
353 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
354 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
355 mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
357 } else if (is_siso(tbl->lq_type)) {
358 if (index > IWL_LAST_OFDM_RATE)
359 index = IWL_LAST_OFDM_RATE;
360 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
363 if (index > IWL_LAST_OFDM_RATE)
364 index = IWL_LAST_OFDM_RATE;
365 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
369 switch (tbl->antenna_type) {
371 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
374 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
377 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
383 if (is_legacy(tbl->lq_type))
388 mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
390 mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
393 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
396 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
397 if (is_siso(tbl->lq_type))
398 mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
403 * Interpret uCode API's rate_n_flags format,
404 * fill "search" or "active" tx mode table.
406 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
407 int phymode, struct iwl4965_scale_tbl_info *tbl,
413 index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
415 if (index == IWL_RATE_INVALID) {
419 tbl->is_SGI = 0; /* default legacy setup */
422 tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
424 /* legacy rate format */
425 if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
426 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
428 if (ant_msk == RATE_MCS_ANT_AB_MSK)
429 tbl->lq_type = LQ_NONE;
432 if (phymode == MODE_IEEE80211A)
437 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
438 tbl->antenna_type = ANT_MAIN;
440 tbl->antenna_type = ANT_AUX;
444 /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
445 } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
446 <= IWL_RATE_SISO_60M_PLCP) {
447 tbl->lq_type = LQ_SISO;
449 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
450 if (ant_msk == RATE_MCS_ANT_AB_MSK)
451 tbl->lq_type = LQ_NONE;
453 if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
454 tbl->antenna_type = ANT_MAIN;
456 tbl->antenna_type = ANT_AUX;
458 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
461 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
462 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
465 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
470 /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
472 tbl->lq_type = LQ_MIMO;
473 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
476 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
477 (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
480 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
487 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
488 struct iwl4965_scale_tbl_info *tbl)
490 if (tbl->antenna_type == ANT_AUX) {
491 tbl->antenna_type = ANT_MAIN;
492 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
493 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
495 tbl->antenna_type = ANT_AUX;
496 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
497 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
501 static inline u8 rs_use_green(struct iwl4965_priv *priv)
503 #ifdef CONFIG_IWL4965_HT
504 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
507 return ((priv->current_assoc_ht.is_green_field) &&
508 !(priv->current_assoc_ht.operating_mode & 0x4));
509 #endif /*CONFIG_IWL4965_HT */
514 * rs_get_supported_rates - get the available rates
516 * if management frame or broadcast frame only return
517 * basic available rates.
520 static void rs_get_supported_rates(struct iwl4965_rate_scale_priv *lq_data,
521 struct ieee80211_hdr *hdr,
522 enum iwl4965_table_type rate_type,
525 if (is_legacy(rate_type))
526 *data_rate = lq_data->active_rate;
528 if (is_siso(rate_type))
529 *data_rate = lq_data->active_siso_rate;
531 *data_rate = lq_data->active_mimo_rate;
534 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
535 lq_data->active_rate_basic)
536 *data_rate = lq_data->active_rate_basic;
539 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
541 u8 high = IWL_RATE_INVALID;
542 u8 low = IWL_RATE_INVALID;
544 /* 802.11A or ht walks to the next literal adjacent rate in
546 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
550 /* Find the previous rate that is in the rate mask */
552 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
553 if (rate_mask & mask) {
559 /* Find the next rate that is in the rate mask */
561 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
562 if (rate_mask & mask) {
568 return (high << 8) | low;
572 while (low != IWL_RATE_INVALID) {
573 low = iwl4965_rates[low].prev_rs;
574 if (low == IWL_RATE_INVALID)
576 if (rate_mask & (1 << low))
578 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
582 while (high != IWL_RATE_INVALID) {
583 high = iwl4965_rates[high].next_rs;
584 if (high == IWL_RATE_INVALID)
586 if (rate_mask & (1 << high))
588 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
591 return (high << 8) | low;
594 static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
595 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
596 u8 ht_possible, struct iwl4965_rate *mcs_rate)
601 u8 switch_to_legacy = 0;
602 u8 is_green = lq_data->is_green;
604 /* check if we need to switch from HT to legacy rates.
605 * assumption is that mandatory rates (1Mbps or 6Mbps)
606 * are always supported (spec demand) */
607 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
608 switch_to_legacy = 1;
609 scale_index = rs_ht_to_legacy[scale_index];
610 if (lq_data->phymode == MODE_IEEE80211A)
615 if ((tbl->antenna_type == ANT_BOTH) ||
616 (tbl->antenna_type == ANT_NONE))
617 tbl->antenna_type = ANT_MAIN;
623 rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
625 /* Mask with station rate restriction */
626 if (is_legacy(tbl->lq_type)) {
627 /* supp_rates has no CCK bits in A mode */
628 if (lq_data->phymode == (u8) MODE_IEEE80211A)
629 rate_mask = (u16)(rate_mask &
630 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
632 rate_mask = (u16)(rate_mask & lq_data->supp_rates);
635 /* If we switched from HT to legacy, check current rate */
636 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
637 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
641 high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
642 low = high_low & 0xff;
644 if (low != IWL_RATE_INVALID)
645 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
647 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
651 * mac80211 sends us Tx status
653 static void rs_tx_status(void *priv_rate,
654 struct net_device *dev,
656 struct ieee80211_tx_status *tx_resp)
660 int rs_index, index = 0;
661 struct iwl4965_rate_scale_priv *lq;
662 struct iwl4965_link_quality_cmd *table;
663 struct sta_info *sta;
664 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
665 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
666 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
667 struct iwl4965_rate_scale_data *window = NULL;
668 struct iwl4965_rate_scale_data *search_win = NULL;
669 struct iwl4965_rate tx_mcs;
670 struct iwl4965_scale_tbl_info tbl_type;
671 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
673 u16 fc = le16_to_cpu(hdr->frame_control);
676 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
678 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
681 retries = tx_resp->retry_count;
687 sta = sta_info_get(local, hdr->addr1);
689 if (!sta || !sta->rate_ctrl_priv) {
695 lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
697 if (!priv->lq_mngr.lq_ready)
700 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
704 active_index = lq->active_tbl;
706 /* Get mac80211 antenna info */
707 lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
709 lq->antenna = lq->valid_antenna;
711 /* Ignore mac80211 antenna info for now */
712 lq->antenna = lq->valid_antenna;
714 curr_tbl = &(lq->lq_info[active_index]);
715 search_tbl = &(lq->lq_info[(1 - active_index)]);
716 window = (struct iwl4965_rate_scale_data *)
718 search_win = (struct iwl4965_rate_scale_data *)
719 &(search_tbl->win[0]);
721 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
723 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
724 &tbl_type, &rs_index);
725 if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
726 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
727 rs_index, tx_mcs.rate_n_flags);
733 * Ignore this Tx frame response if its initial rate doesn't match
734 * that of latest Link Quality command. There may be stragglers
735 * from a previous Link Quality command, but we're no longer interested
736 * in those; they're either from the "active" mode while we're trying
737 * to check "search" mode, or a prior "search" mode after we've moved
738 * to a new "search" mode (which might become the new "active" mode).
741 (tx_mcs.rate_n_flags !=
742 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
743 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
745 le32_to_cpu(table->rs_table[0].rate_n_flags));
750 /* Update frame history window with "failure" for each Tx retry. */
752 /* Look up the rate and other info used for each tx attempt.
753 * Each tx attempt steps one entry deeper in the rate table. */
754 tx_mcs.rate_n_flags =
755 le32_to_cpu(table->rs_table[index].rate_n_flags);
756 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
757 &tbl_type, &rs_index);
759 /* If type matches "search" table,
760 * add failure to "search" history */
761 if ((tbl_type.lq_type == search_tbl->lq_type) &&
762 (tbl_type.antenna_type == search_tbl->antenna_type) &&
763 (tbl_type.is_SGI == search_tbl->is_SGI)) {
764 if (search_tbl->expected_tpt)
765 tpt = search_tbl->expected_tpt[rs_index];
768 rs_collect_tx_data(search_win, rs_index, tpt, 0);
770 /* Else if type matches "current/active" table,
771 * add failure to "current/active" history */
772 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
773 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
774 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
775 if (curr_tbl->expected_tpt)
776 tpt = curr_tbl->expected_tpt[rs_index];
779 rs_collect_tx_data(window, rs_index, tpt, 0);
782 /* If not searching for a new mode, increment failed counter
783 * ... this helps determine when to start searching again */
792 * Find (by rate) the history window to update with final Tx attempt;
793 * if Tx was successful first try, use original rate,
794 * else look up the rate that was, finally, successful.
796 if (!tx_resp->retry_count)
797 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
799 tx_mcs.rate_n_flags =
800 le32_to_cpu(table->rs_table[index].rate_n_flags);
802 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
803 &tbl_type, &rs_index);
805 /* Update frame history window with "success" if Tx got ACKed ... */
806 if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
811 /* If type matches "search" table,
812 * add final tx status to "search" history */
813 if ((tbl_type.lq_type == search_tbl->lq_type) &&
814 (tbl_type.antenna_type == search_tbl->antenna_type) &&
815 (tbl_type.is_SGI == search_tbl->is_SGI)) {
816 if (search_tbl->expected_tpt)
817 tpt = search_tbl->expected_tpt[rs_index];
820 rs_collect_tx_data(search_win,
821 rs_index, tpt, status);
823 /* Else if type matches "current/active" table,
824 * add final tx status to "current/active" history */
825 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
826 (tbl_type.antenna_type == curr_tbl->antenna_type) &&
827 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
828 if (curr_tbl->expected_tpt)
829 tpt = curr_tbl->expected_tpt[rs_index];
832 rs_collect_tx_data(window, rs_index, tpt, status);
835 /* If not searching for new mode, increment success/failed counter
836 * ... these help determine when to start searching again */
837 if (lq->stay_in_tbl) {
844 /* See if there's a better rate or modulation mode to try. */
845 rs_rate_scale_perform(priv, dev, hdr, sta);
850 static u8 rs_is_ant_connected(u8 valid_antenna,
851 enum iwl4965_antenna_type antenna_type)
853 if (antenna_type == ANT_AUX)
854 return ((valid_antenna & 0x2) ? 1:0);
855 else if (antenna_type == ANT_MAIN)
856 return ((valid_antenna & 0x1) ? 1:0);
857 else if (antenna_type == ANT_BOTH)
858 return ((valid_antenna & 0x3) == 0x3);
863 static u8 rs_is_other_ant_connected(u8 valid_antenna,
864 enum iwl4965_antenna_type antenna_type)
866 if (antenna_type == ANT_AUX)
867 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
869 return rs_is_ant_connected(valid_antenna, ANT_AUX);
875 * Begin a period of staying with a selected modulation mode.
876 * Set "stay_in_tbl" flag to prevent any mode switches.
877 * Set frame tx success limits according to legacy vs. high-throughput,
878 * and reset overall (spanning all rates) tx success history statistics.
879 * These control how long we stay using same modulation mode before
880 * searching for a new mode.
882 static void rs_set_stay_in_table(u8 is_legacy,
883 struct iwl4965_rate_scale_priv *lq_data)
885 IWL_DEBUG_HT("we are staying in the same table\n");
886 lq_data->stay_in_tbl = 1; /* only place this gets set */
888 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
889 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
890 lq_data->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
892 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
893 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
894 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
896 lq_data->table_count = 0;
897 lq_data->total_failed = 0;
898 lq_data->total_success = 0;
902 * Find correct throughput table for given mode of modulation
904 static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
905 struct iwl4965_scale_tbl_info *tbl)
907 if (is_legacy(tbl->lq_type)) {
908 if (!is_a_band(tbl->lq_type))
909 tbl->expected_tpt = expected_tpt_G;
911 tbl->expected_tpt = expected_tpt_A;
912 } else if (is_siso(tbl->lq_type)) {
913 if (tbl->is_fat && !lq_data->is_dup)
915 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
917 tbl->expected_tpt = expected_tpt_siso40MHz;
918 else if (tbl->is_SGI)
919 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
921 tbl->expected_tpt = expected_tpt_siso20MHz;
923 } else if (is_mimo(tbl->lq_type)) {
924 if (tbl->is_fat && !lq_data->is_dup)
926 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
928 tbl->expected_tpt = expected_tpt_mimo40MHz;
929 else if (tbl->is_SGI)
930 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
932 tbl->expected_tpt = expected_tpt_mimo20MHz;
934 tbl->expected_tpt = expected_tpt_G;
937 #ifdef CONFIG_IWL4965_HT
939 * Find starting rate for new "search" high-throughput mode of modulation.
940 * Goal is to find lowest expected rate (under perfect conditions) that is
941 * above the current measured throughput of "active" mode, to give new mode
942 * a fair chance to prove itself without too many challenges.
944 * This gets called when transitioning to more aggressive modulation
945 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
946 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
947 * to decrease to match "active" throughput. When moving from MIMO to SISO,
948 * bit rate will typically need to increase, but not if performance was bad.
950 static s32 rs_get_best_rate(struct iwl4965_priv *priv,
951 struct iwl4965_rate_scale_priv *lq_data,
952 struct iwl4965_scale_tbl_info *tbl, /* "search" */
953 u16 rate_mask, s8 index, s8 rate)
955 /* "active" values */
956 struct iwl4965_scale_tbl_info *active_tbl =
957 &(lq_data->lq_info[lq_data->active_tbl]);
958 s32 active_sr = active_tbl->win[index].success_ratio;
959 s32 active_tpt = active_tbl->expected_tpt[index];
961 /* expected "search" throughput */
962 s32 *tpt_tbl = tbl->expected_tpt;
964 s32 new_rate, high, low, start_hi;
967 new_rate = high = low = start_hi = IWL_RATE_INVALID;
970 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
972 low = high_low & 0xff;
973 high = (high_low >> 8) & 0xff;
976 * Lower the "search" bit rate, to give new "search" mode
977 * approximately the same throughput as "active" if:
979 * 1) "Active" mode has been working modestly well (but not
980 * great), and expected "search" throughput (under perfect
981 * conditions) at candidate rate is above the actual
982 * measured "active" throughput (but less than expected
983 * "active" throughput under perfect conditions).
985 * 2) "Active" mode has been working perfectly or very well
986 * and expected "search" throughput (under perfect
987 * conditions) at candidate rate is above expected
988 * "active" throughput (under perfect conditions).
990 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
991 ((active_sr > IWL_RATE_DECREASE_TH) &&
992 (active_sr <= IWL_RATE_HIGH_TH) &&
993 (tpt_tbl[rate] <= active_tpt))) ||
994 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
995 (tpt_tbl[rate] > active_tpt))) {
997 /* (2nd or later pass)
998 * If we've already tried to raise the rate, and are
999 * now trying to lower it, use the higher rate. */
1000 if (start_hi != IWL_RATE_INVALID) {
1001 new_rate = start_hi;
1007 /* Loop again with lower rate */
1008 if (low != IWL_RATE_INVALID)
1011 /* Lower rate not available, use the original */
1015 /* Else try to raise the "search" rate to match "active" */
1017 /* (2nd or later pass)
1018 * If we've already tried to lower the rate, and are
1019 * now trying to raise it, use the lower rate. */
1020 if (new_rate != IWL_RATE_INVALID)
1023 /* Loop again with higher rate */
1024 else if (high != IWL_RATE_INVALID) {
1028 /* Higher rate not available, use the original */
1038 #endif /* CONFIG_IWL4965_HT */
1040 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1042 return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1046 * Set up search table for MIMO
1048 static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1049 struct iwl4965_rate_scale_priv *lq_data,
1050 struct iwl4965_scale_tbl_info *tbl, int index)
1052 #ifdef CONFIG_IWL4965_HT
1055 s8 is_green = lq_data->is_green;
1057 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1060 IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1061 tbl->lq_type = LQ_MIMO;
1062 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1065 if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1068 /* Need both Tx chains/antennas to support MIMO */
1069 if (!rs_is_both_ant_supp(lq_data->antenna))
1072 tbl->is_dup = lq_data->is_dup;
1074 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1080 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1084 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1089 rs_get_expected_tpt_table(lq_data, tbl);
1091 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1093 IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1094 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1096 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1098 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1099 tbl->current_rate.rate_n_flags, is_green);
1103 #endif /*CONFIG_IWL4965_HT */
1107 * Set up search table for SISO
1109 static int rs_switch_to_siso(struct iwl4965_priv *priv,
1110 struct iwl4965_rate_scale_priv *lq_data,
1111 struct iwl4965_scale_tbl_info *tbl, int index)
1113 #ifdef CONFIG_IWL4965_HT
1115 u8 is_green = lq_data->is_green;
1118 IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1119 if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
1122 tbl->is_dup = lq_data->is_dup;
1123 tbl->lq_type = LQ_SISO;
1125 rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1128 if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
1134 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
1138 } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
1146 rs_get_expected_tpt_table(lq_data, tbl);
1147 rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1149 IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1150 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1151 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1155 rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1156 IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1157 tbl->current_rate.rate_n_flags, is_green);
1162 #endif /*CONFIG_IWL4965_HT */
1166 * Try to switch to new modulation mode from legacy
1168 static int rs_move_legacy_other(struct iwl4965_priv *priv,
1169 struct iwl4965_rate_scale_priv *lq_data,
1173 struct iwl4965_scale_tbl_info *tbl =
1174 &(lq_data->lq_info[lq_data->active_tbl]);
1175 struct iwl4965_scale_tbl_info *search_tbl =
1176 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1177 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1178 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1179 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1180 u8 start_action = tbl->action;
1183 switch (tbl->action) {
1184 case IWL_LEGACY_SWITCH_ANTENNA:
1185 IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1187 search_tbl->lq_type = LQ_NONE;
1188 lq_data->action_counter++;
1190 /* Don't change antenna if success has been great */
1191 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1194 /* Don't change antenna if other one is not connected */
1195 if (!rs_is_other_ant_connected(lq_data->antenna,
1199 /* Set up search table to try other antenna */
1200 memcpy(search_tbl, tbl, sz);
1202 rs_toggle_antenna(&(search_tbl->current_rate),
1204 rs_get_expected_tpt_table(lq_data, search_tbl);
1205 lq_data->search_better_tbl = 1;
1208 case IWL_LEGACY_SWITCH_SISO:
1209 IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1211 /* Set up search table to try SISO */
1212 memcpy(search_tbl, tbl, sz);
1213 search_tbl->lq_type = LQ_SISO;
1214 search_tbl->is_SGI = 0;
1215 search_tbl->is_fat = 0;
1216 ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1219 lq_data->search_better_tbl = 1;
1220 lq_data->action_counter = 0;
1225 case IWL_LEGACY_SWITCH_MIMO:
1226 IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1228 /* Set up search table to try MIMO */
1229 memcpy(search_tbl, tbl, sz);
1230 search_tbl->lq_type = LQ_MIMO;
1231 search_tbl->is_SGI = 0;
1232 search_tbl->is_fat = 0;
1233 search_tbl->antenna_type = ANT_BOTH;
1234 ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1237 lq_data->search_better_tbl = 1;
1238 lq_data->action_counter = 0;
1244 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1245 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1247 if (tbl->action == start_action)
1255 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1256 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1262 * Try to switch to new modulation mode from SISO
1264 static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1265 struct iwl4965_rate_scale_priv *lq_data,
1269 u8 is_green = lq_data->is_green;
1270 struct iwl4965_scale_tbl_info *tbl =
1271 &(lq_data->lq_info[lq_data->active_tbl]);
1272 struct iwl4965_scale_tbl_info *search_tbl =
1273 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1274 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1275 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1276 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1277 u8 start_action = tbl->action;
1280 lq_data->action_counter++;
1281 switch (tbl->action) {
1282 case IWL_SISO_SWITCH_ANTENNA:
1283 IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1284 search_tbl->lq_type = LQ_NONE;
1285 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1287 if (!rs_is_other_ant_connected(lq_data->antenna,
1291 memcpy(search_tbl, tbl, sz);
1292 search_tbl->action = IWL_SISO_SWITCH_MIMO;
1293 rs_toggle_antenna(&(search_tbl->current_rate),
1295 lq_data->search_better_tbl = 1;
1299 case IWL_SISO_SWITCH_MIMO:
1300 IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1301 memcpy(search_tbl, tbl, sz);
1302 search_tbl->lq_type = LQ_MIMO;
1303 search_tbl->is_SGI = 0;
1304 search_tbl->is_fat = 0;
1305 search_tbl->antenna_type = ANT_BOTH;
1306 ret = rs_switch_to_mimo(priv, lq_data, search_tbl,
1309 lq_data->search_better_tbl = 1;
1313 case IWL_SISO_SWITCH_GI:
1314 IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1315 memcpy(search_tbl, tbl, sz);
1316 search_tbl->action = 0;
1317 if (search_tbl->is_SGI)
1318 search_tbl->is_SGI = 0;
1320 search_tbl->is_SGI = 1;
1323 lq_data->search_better_tbl = 1;
1324 if ((tbl->lq_type == LQ_SISO) &&
1326 s32 tpt = lq_data->last_tpt / 100;
1327 if (((!tbl->is_fat) &&
1328 (tpt >= expected_tpt_siso20MHz[index])) ||
1330 (tpt >= expected_tpt_siso40MHz[index])))
1331 lq_data->search_better_tbl = 0;
1333 rs_get_expected_tpt_table(lq_data, search_tbl);
1334 rs_mcs_from_tbl(&search_tbl->current_rate,
1335 search_tbl, index, is_green);
1339 if (tbl->action > IWL_SISO_SWITCH_GI)
1340 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1342 if (tbl->action == start_action)
1349 if (tbl->action > IWL_SISO_SWITCH_GI)
1350 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1355 * Try to switch to new modulation mode from MIMO
1357 static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1358 struct iwl4965_rate_scale_priv *lq_data,
1362 s8 is_green = lq_data->is_green;
1363 struct iwl4965_scale_tbl_info *tbl =
1364 &(lq_data->lq_info[lq_data->active_tbl]);
1365 struct iwl4965_scale_tbl_info *search_tbl =
1366 &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1367 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1368 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1369 u8 start_action = tbl->action;
1372 lq_data->action_counter++;
1373 switch (tbl->action) {
1374 case IWL_MIMO_SWITCH_ANTENNA_A:
1375 case IWL_MIMO_SWITCH_ANTENNA_B:
1376 IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1378 /* Set up new search table for SISO */
1379 memcpy(search_tbl, tbl, sz);
1380 search_tbl->lq_type = LQ_SISO;
1381 search_tbl->is_SGI = 0;
1382 search_tbl->is_fat = 0;
1383 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1384 search_tbl->antenna_type = ANT_MAIN;
1386 search_tbl->antenna_type = ANT_AUX;
1388 ret = rs_switch_to_siso(priv, lq_data, search_tbl,
1391 lq_data->search_better_tbl = 1;
1396 case IWL_MIMO_SWITCH_GI:
1397 IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1399 /* Set up new search table for MIMO */
1400 memcpy(search_tbl, tbl, sz);
1401 search_tbl->lq_type = LQ_MIMO;
1402 search_tbl->antenna_type = ANT_BOTH;
1403 search_tbl->action = 0;
1404 if (search_tbl->is_SGI)
1405 search_tbl->is_SGI = 0;
1407 search_tbl->is_SGI = 1;
1408 lq_data->search_better_tbl = 1;
1411 * If active table already uses the fastest possible
1412 * modulation (dual stream with short guard interval),
1413 * and it's working well, there's no need to look
1414 * for a better type of modulation!
1416 if ((tbl->lq_type == LQ_MIMO) &&
1418 s32 tpt = lq_data->last_tpt / 100;
1419 if (((!tbl->is_fat) &&
1420 (tpt >= expected_tpt_mimo20MHz[index])) ||
1422 (tpt >= expected_tpt_mimo40MHz[index])))
1423 lq_data->search_better_tbl = 0;
1425 rs_get_expected_tpt_table(lq_data, search_tbl);
1426 rs_mcs_from_tbl(&search_tbl->current_rate,
1427 search_tbl, index, is_green);
1432 if (tbl->action > IWL_MIMO_SWITCH_GI)
1433 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1435 if (tbl->action == start_action)
1442 if (tbl->action > IWL_MIMO_SWITCH_GI)
1443 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1449 * Check whether we should continue using same modulation mode, or
1450 * begin search for a new mode, based on:
1451 * 1) # tx successes or failures while using this mode
1452 * 2) # times calling this function
1453 * 3) elapsed time in this mode (not used, for now)
1455 static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
1457 struct iwl4965_scale_tbl_info *tbl;
1460 int flush_interval_passed = 0;
1462 active_tbl = lq_data->active_tbl;
1464 tbl = &(lq_data->lq_info[active_tbl]);
1466 /* If we've been disallowing search, see if we should now allow it */
1467 if (lq_data->stay_in_tbl) {
1469 /* Elapsed time using current modulation mode */
1470 if (lq_data->flush_timer)
1471 flush_interval_passed =
1473 (unsigned long)(lq_data->flush_timer +
1474 IWL_RATE_SCALE_FLUSH_INTVL));
1476 /* For now, disable the elapsed time criterion */
1477 flush_interval_passed = 0;
1480 * Check if we should allow search for new modulation mode.
1481 * If many frames have failed or succeeded, or we've used
1482 * this same modulation for a long time, allow search, and
1483 * reset history stats that keep track of whether we should
1484 * allow a new search. Also (below) reset all bitmaps and
1485 * stats in active history.
1487 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1488 (lq_data->total_success > lq_data->max_success_limit) ||
1489 ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1490 && (flush_interval_passed))) {
1491 IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1492 lq_data->total_failed,
1493 lq_data->total_success,
1494 flush_interval_passed);
1496 /* Allow search for new mode */
1497 lq_data->stay_in_tbl = 0; /* only place reset */
1498 lq_data->total_failed = 0;
1499 lq_data->total_success = 0;
1500 lq_data->flush_timer = 0;
1503 * Else if we've used this modulation mode enough repetitions
1504 * (regardless of elapsed time or success/failure), reset
1505 * history bitmaps and rate-specific stats for all rates in
1509 lq_data->table_count++;
1510 if (lq_data->table_count >=
1511 lq_data->table_count_limit) {
1512 lq_data->table_count = 0;
1514 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1515 for (i = 0; i < IWL_RATE_COUNT; i++)
1516 rs_rate_scale_clear_window(
1521 /* If transitioning to allow "search", reset all history
1522 * bitmaps and stats in active table (this will become the new
1523 * "search" table). */
1524 if (!lq_data->stay_in_tbl) {
1525 for (i = 0; i < IWL_RATE_COUNT; i++)
1526 rs_rate_scale_clear_window(&(tbl->win[i]));
1532 * Do rate scaling and search for new modulation mode.
1534 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1535 struct net_device *dev,
1536 struct ieee80211_hdr *hdr,
1537 struct sta_info *sta)
1539 int low = IWL_RATE_INVALID;
1540 int high = IWL_RATE_INVALID;
1543 struct iwl4965_rate_scale_data *window = NULL;
1544 int current_tpt = IWL_INVALID_VALUE;
1545 int low_tpt = IWL_INVALID_VALUE;
1546 int high_tpt = IWL_INVALID_VALUE;
1548 s8 scale_action = 0;
1551 struct iwl4965_rate_scale_priv *lq_data;
1552 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1553 u16 rate_scale_index_msk = 0;
1554 struct iwl4965_rate mcs_rate;
1560 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1562 fc = le16_to_cpu(hdr->frame_control);
1563 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1564 /* Send management frames and broadcast/multicast data using
1566 /* TODO: this could probably be improved.. */
1570 if (!sta || !sta->rate_ctrl_priv)
1573 if (!priv->lq_mngr.lq_ready) {
1574 IWL_DEBUG_RATE("still rate scaling not ready\n");
1577 lq_data = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1580 * Select rate-scale / modulation-mode table to work with in
1581 * the rest of this function: "search" if searching for better
1582 * modulation mode, or "active" if doing rate scaling within a mode.
1584 if (!lq_data->search_better_tbl)
1585 active_tbl = lq_data->active_tbl;
1587 active_tbl = 1 - lq_data->active_tbl;
1589 tbl = &(lq_data->lq_info[active_tbl]);
1590 is_green = lq_data->is_green;
1592 /* current tx rate */
1593 index = sta->last_txrate;
1595 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1598 /* rates available for this association, and for modulation mode */
1599 rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1602 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1604 /* mask with station rate restriction */
1605 if (is_legacy(tbl->lq_type)) {
1606 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1607 /* supp_rates has no CCK bits in A mode */
1608 rate_scale_index_msk = (u16) (rate_mask &
1609 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1611 rate_scale_index_msk = (u16) (rate_mask &
1612 lq_data->supp_rates);
1615 rate_scale_index_msk = rate_mask;
1617 if (!rate_scale_index_msk)
1618 rate_scale_index_msk = rate_mask;
1620 /* If current rate is no longer supported on current association,
1621 * or user changed preferences for rates, find a new supported rate. */
1622 if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1623 index = IWL_INVALID_VALUE;
1626 /* get the highest available rate */
1627 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1628 if ((1 << i) & rate_scale_index_msk)
1632 if (index == IWL_INVALID_VALUE) {
1633 IWL_WARNING("Can not find a suitable rate\n");
1638 /* Get expected throughput table and history window for current rate */
1639 if (!tbl->expected_tpt)
1640 rs_get_expected_tpt_table(lq_data, tbl);
1642 window = &(tbl->win[index]);
1645 * If there is not enough history to calculate actual average
1646 * throughput, keep analyzing results of more tx frames, without
1647 * changing rate or mode (bypass most of the rest of this function).
1648 * Set up new rate table in uCode only if old rate is not supported
1649 * in current association (use new rate found above).
1651 fail_count = window->counter - window->success_counter;
1652 if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1653 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1654 || (tbl->expected_tpt == NULL)) {
1655 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1657 window->success_counter, window->counter, index);
1659 /* Can't calculate this yet; not enough history */
1660 window->average_tpt = IWL_INVALID_VALUE;
1662 /* Should we stay with this modulation mode,
1663 * or search for a new one? */
1664 rs_stay_in_table(lq_data);
1666 /* Set up new rate table in uCode, if needed */
1668 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1669 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1670 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1674 /* Else we have enough samples; calculate estimate of
1675 * actual average throughput */
1677 window->average_tpt = ((window->success_ratio *
1678 tbl->expected_tpt[index] + 64) / 128);
1680 /* If we are searching for better modulation mode, check success. */
1681 if (lq_data->search_better_tbl) {
1682 int success_limit = IWL_RATE_SCALE_SWITCH;
1684 /* If good success, continue using the "search" mode;
1685 * no need to send new link quality command, since we're
1686 * continuing to use the setup that we've been trying. */
1687 if ((window->success_ratio > success_limit) ||
1688 (window->average_tpt > lq_data->last_tpt)) {
1689 if (!is_legacy(tbl->lq_type)) {
1690 IWL_DEBUG_HT("LQ: we are switching to HT"
1691 " rate suc %d current tpt %d"
1693 window->success_ratio,
1694 window->average_tpt,
1696 lq_data->enable_counter = 1;
1698 /* Swap tables; "search" becomes "active" */
1699 lq_data->active_tbl = active_tbl;
1700 current_tpt = window->average_tpt;
1702 /* Else poor success; go back to mode in "active" table */
1704 /* Nullify "search" table */
1705 tbl->lq_type = LQ_NONE;
1707 /* Revert to "active" table */
1708 active_tbl = lq_data->active_tbl;
1709 tbl = &(lq_data->lq_info[active_tbl]);
1711 /* Revert to "active" rate and throughput info */
1712 index = iwl4965_rate_index_from_plcp(
1713 tbl->current_rate.rate_n_flags);
1714 current_tpt = lq_data->last_tpt;
1716 /* Need to set up a new rate table in uCode */
1718 IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1721 /* Either way, we've made a decision; modulation mode
1722 * search is done, allow rate adjustment next time. */
1723 lq_data->search_better_tbl = 0;
1724 done_search = 1; /* Don't switch modes below! */
1728 /* (Else) not in search of better modulation mode, try for better
1729 * starting rate, while staying in this mode. */
1730 high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1732 low = high_low & 0xff;
1733 high = (high_low >> 8) & 0xff;
1735 /* Collect measured throughputs for current and adjacent rates */
1736 current_tpt = window->average_tpt;
1737 if (low != IWL_RATE_INVALID)
1738 low_tpt = tbl->win[low].average_tpt;
1739 if (high != IWL_RATE_INVALID)
1740 high_tpt = tbl->win[high].average_tpt;
1742 /* Assume rate increase */
1745 /* Too many failures, decrease rate */
1746 if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1747 (current_tpt == 0)) {
1748 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1751 /* No throughput measured yet for adjacent rates; try increase. */
1752 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1753 (high_tpt == IWL_INVALID_VALUE))
1756 /* Both adjacent throughputs are measured, but neither one has better
1757 * throughput; we're using the best rate, don't change it! */
1758 else if ((low_tpt != IWL_INVALID_VALUE) &&
1759 (high_tpt != IWL_INVALID_VALUE) &&
1760 (low_tpt < current_tpt) &&
1761 (high_tpt < current_tpt))
1764 /* At least one adjacent rate's throughput is measured,
1765 * and may have better performance. */
1767 /* Higher adjacent rate's throughput is measured */
1768 if (high_tpt != IWL_INVALID_VALUE) {
1769 /* Higher rate has better throughput */
1770 if (high_tpt > current_tpt)
1774 ("decrease rate because of high tpt\n");
1778 /* Lower adjacent rate's throughput is measured */
1779 } else if (low_tpt != IWL_INVALID_VALUE) {
1780 /* Lower rate has better throughput */
1781 if (low_tpt > current_tpt) {
1783 ("decrease rate because of low tpt\n");
1790 /* Sanity check; asked for decrease, but success rate or throughput
1791 * has been good at old rate. Don't change it. */
1792 if (scale_action == -1) {
1793 if ((low != IWL_RATE_INVALID) &&
1794 ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1795 (current_tpt > (100 * tbl->expected_tpt[low]))))
1798 /* Sanity check; asked for increase, but success rate has not been great
1799 * even at old rate, higher rate will be worse. Don't change it. */
1800 } else if ((scale_action == 1) &&
1801 (window->success_ratio < IWL_RATE_INCREASE_TH))
1804 switch (scale_action) {
1806 /* Decrease starting rate, update uCode's rate table */
1807 if (low != IWL_RATE_INVALID) {
1813 /* Increase starting rate, update uCode's rate table */
1814 if (high != IWL_RATE_INVALID) {
1826 IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1827 "high %d type %d\n",
1828 index, scale_action, low, high, tbl->lq_type);
1831 /* Replace uCode's rate table for the destination station. */
1833 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1834 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1835 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1838 /* Should we stay with this modulation mode, or search for a new one? */
1839 rs_stay_in_table(lq_data);
1842 * Search for new modulation mode if we're:
1843 * 1) Not changing rates right now
1844 * 2) Not just finishing up a search
1845 * 3) Allowing a new search
1847 if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1848 /* Save current throughput to compare with "search" throughput*/
1849 lq_data->last_tpt = current_tpt;
1851 /* Select a new "search" modulation mode to try.
1852 * If one is found, set up the new "search" table. */
1853 if (is_legacy(tbl->lq_type))
1854 rs_move_legacy_other(priv, lq_data, index);
1855 else if (is_siso(tbl->lq_type))
1856 rs_move_siso_to_other(priv, lq_data, index);
1858 rs_move_mimo_to_other(priv, lq_data, index);
1860 /* If new "search" mode was selected, set up in uCode table */
1861 if (lq_data->search_better_tbl) {
1862 /* Access the "search" table, clear its history. */
1863 tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1864 for (i = 0; i < IWL_RATE_COUNT; i++)
1865 rs_rate_scale_clear_window(&(tbl->win[i]));
1867 /* Use new "search" start rate */
1868 index = iwl4965_rate_index_from_plcp(
1869 tbl->current_rate.rate_n_flags);
1871 IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
1872 tbl->current_rate.rate_n_flags, index);
1873 rs_fill_link_cmd(lq_data, &tbl->current_rate,
1875 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1878 /* If the "active" (non-search) mode was legacy,
1879 * and we've tried switching antennas,
1880 * but we haven't been able to try HT modes (not available),
1881 * stay with best antenna legacy modulation for a while
1882 * before next round of mode comparisons. */
1883 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1884 if (is_legacy(tbl1->lq_type) &&
1885 #ifdef CONFIG_IWL4965_HT
1886 !priv->current_assoc_ht.is_ht &&
1888 (lq_data->action_counter >= 1)) {
1889 lq_data->action_counter = 0;
1890 IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1891 rs_set_stay_in_table(1, lq_data);
1894 /* If we're in an HT mode, and all 3 mode switch actions
1895 * have been tried and compared, stay in this best modulation
1896 * mode for a while before next round of mode comparisons. */
1897 if (lq_data->enable_counter &&
1898 (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1899 #ifdef CONFIG_IWL4965_HT_AGG
1900 /* If appropriate, set up aggregation! */
1901 if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1902 (priv->lq_mngr.agg_ctrl.auto_agg)) {
1903 priv->lq_mngr.agg_ctrl.tid_retry =
1905 schedule_work(&priv->agg_work);
1907 #endif /*CONFIG_IWL4965_HT_AGG */
1908 lq_data->action_counter = 0;
1909 rs_set_stay_in_table(0, lq_data);
1913 * Else, don't search for a new modulation mode.
1914 * Put new timestamp in stay-in-modulation-mode flush timer if:
1915 * 1) Not changing rates right now
1916 * 2) Not just finishing up a search
1917 * 3) flush timer is empty
1920 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1921 lq_data->flush_timer = jiffies;
1925 rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1927 sta->last_txrate = i;
1929 /* sta->txrate is an index to A mode rates which start
1930 * at IWL_FIRST_OFDM_RATE
1932 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1933 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1941 static void rs_initialize_lq(struct iwl4965_priv *priv,
1942 struct sta_info *sta)
1945 struct iwl4965_rate_scale_priv *lq;
1946 struct iwl4965_scale_tbl_info *tbl;
1949 u8 use_green = rs_use_green(priv);
1950 struct iwl4965_rate mcs_rate;
1952 if (!sta || !sta->rate_ctrl_priv)
1955 lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1956 i = sta->last_txrate;
1958 if ((lq->lq.sta_id == 0xff) &&
1959 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1962 if (!lq->search_better_tbl)
1963 active_tbl = lq->active_tbl;
1965 active_tbl = 1 - lq->active_tbl;
1967 tbl = &(lq->lq_info[active_tbl]);
1969 if ((i < 0) || (i >= IWL_RATE_COUNT))
1972 mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
1973 mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1974 mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1976 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1977 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1979 tbl->antenna_type = ANT_AUX;
1980 rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1981 if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1982 rs_toggle_antenna(&mcs_rate, tbl);
1984 rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1985 tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1986 rs_get_expected_tpt_table(lq, tbl);
1987 rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
1988 rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1993 static void rs_get_rate(void *priv_rate, struct net_device *dev,
1994 struct ieee80211_hw_mode *mode, struct sk_buff *skb,
1995 struct rate_selection *sel)
1999 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2000 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2001 struct sta_info *sta;
2002 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2003 struct iwl4965_rate_scale_priv *lq;
2005 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2007 sta = sta_info_get(local, hdr->addr1);
2009 if (!sta || !sta->rate_ctrl_priv) {
2010 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2016 lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
2017 i = sta->last_txrate;
2019 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
2020 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2021 DECLARE_MAC_BUF(mac);
2023 if (sta_id == IWL_INVALID_STATION) {
2024 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2025 print_mac(mac, hdr->addr1));
2026 sta_id = iwl4965_add_station_flags(priv,
2027 hdr->addr1, 0, CMD_ASYNC);
2029 if ((sta_id != IWL_INVALID_STATION)) {
2030 lq->lq.sta_id = sta_id;
2031 lq->lq.rs_table[0].rate_n_flags = 0;
2032 lq->ibss_sta_added = 1;
2033 rs_initialize_lq(priv, sta);
2035 if (!lq->ibss_sta_added)
2040 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2041 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2046 sel->rate = &priv->ieee_rates[i];
2049 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2051 struct iwl4965_rate_scale_priv *crl;
2054 IWL_DEBUG_RATE("create station rate scale window\n");
2056 crl = kzalloc(sizeof(struct iwl4965_rate_scale_priv), gfp);
2060 crl->lq.sta_id = 0xff;
2063 for (j = 0; j < LQ_SIZE; j++)
2064 for (i = 0; i < IWL_RATE_COUNT; i++)
2065 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2070 static void rs_rate_init(void *priv_rate, void *priv_sta,
2071 struct ieee80211_local *local,
2072 struct sta_info *sta)
2075 struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2076 struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2077 struct iwl4965_rate_scale_priv *crl = priv_sta;
2079 crl->flush_timer = 0;
2080 crl->supp_rates = sta->supp_rates;
2082 for (j = 0; j < LQ_SIZE; j++)
2083 for (i = 0; i < IWL_RATE_COUNT; i++)
2084 rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2086 IWL_DEBUG_RATE("rate scale global init\n");
2087 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2088 * the lowest or the highest rate.. Could consider using RSSI from
2089 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2092 crl->ibss_sta_added = 0;
2093 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2094 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2095 DECLARE_MAC_BUF(mac);
2097 /* for IBSS the call are from tasklet */
2098 IWL_DEBUG_HT("LQ: ADD station %s\n",
2099 print_mac(mac, sta->addr));
2101 if (sta_id == IWL_INVALID_STATION) {
2102 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2103 print_mac(mac, sta->addr));
2104 sta_id = iwl4965_add_station_flags(priv,
2105 sta->addr, 0, CMD_ASYNC);
2107 if ((sta_id != IWL_INVALID_STATION)) {
2108 crl->lq.sta_id = sta_id;
2109 crl->lq.rs_table[0].rate_n_flags = 0;
2111 /* FIXME: this is w/a remove it later */
2112 priv->assoc_station_added = 1;
2115 /* Find highest tx rate supported by hardware and destination station */
2116 for (i = 0; i < mode->num_rates; i++) {
2117 if ((sta->supp_rates & BIT(i)) &&
2118 (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2121 sta->last_txrate = sta->txrate;
2122 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2123 if (local->hw.conf.phymode == MODE_IEEE80211A)
2124 sta->last_txrate += IWL_FIRST_OFDM_RATE;
2126 crl->is_dup = priv->is_dup;
2127 crl->valid_antenna = priv->valid_antenna;
2128 crl->antenna = priv->antenna;
2129 crl->is_green = rs_use_green(priv);
2130 crl->active_rate = priv->active_rate;
2131 crl->active_rate &= ~(0x1000);
2132 crl->active_rate_basic = priv->active_rate_basic;
2133 crl->phymode = priv->phymode;
2134 #ifdef CONFIG_IWL4965_HT
2136 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2137 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2139 crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
2140 crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
2141 crl->active_siso_rate &= ~((u16)0x2);
2142 crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
2145 crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
2146 crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
2147 crl->active_mimo_rate &= ~((u16)0x2);
2148 crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2149 IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
2150 crl->active_mimo_rate);
2151 #endif /*CONFIG_IWL4965_HT*/
2152 #ifdef CONFIG_MAC80211_DEBUGFS
2156 if (priv->assoc_station_added)
2157 priv->lq_mngr.lq_ready = 1;
2159 rs_initialize_lq(priv, sta);
2162 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
2163 struct iwl4965_rate *tx_mcs,
2164 struct iwl4965_link_quality_cmd *lq_cmd)
2168 int repeat_rate = 0;
2169 u8 ant_toggle_count = 0;
2170 u8 use_ht_possible = 1;
2171 struct iwl4965_rate new_rate;
2172 struct iwl4965_scale_tbl_info tbl_type = { 0 };
2174 /* Override starting rate (index 0) if needed for debug purposes */
2175 rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
2177 /* Interpret rate_n_flags */
2178 rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
2179 &tbl_type, &rate_idx);
2181 /* How many times should we repeat the initial rate? */
2182 if (is_legacy(tbl_type.lq_type)) {
2183 ant_toggle_count = 1;
2184 repeat_rate = IWL_NUMBER_TRY;
2186 repeat_rate = IWL_HT_NUMBER_TRY;
2188 lq_cmd->general_params.mimo_delimiter =
2189 is_mimo(tbl_type.lq_type) ? 1 : 0;
2191 /* Fill 1st table entry (index 0) */
2192 lq_cmd->rs_table[index].rate_n_flags =
2193 cpu_to_le32(tx_mcs->rate_n_flags);
2194 new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2196 if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2197 lq_cmd->general_params.single_stream_ant_msk
2198 = LINK_QUAL_ANT_A_MSK;
2200 lq_cmd->general_params.single_stream_ant_msk
2201 = LINK_QUAL_ANT_B_MSK;
2206 /* Fill rest of rate table */
2207 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2208 /* Repeat initial/next rate.
2209 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2210 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2211 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2212 if (is_legacy(tbl_type.lq_type)) {
2213 if (ant_toggle_count <
2214 NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2217 rs_toggle_antenna(&new_rate, &tbl_type);
2218 ant_toggle_count = 1;
2222 /* Override next rate if needed for debug purposes */
2223 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2225 /* Fill next table entry */
2226 lq_cmd->rs_table[index].rate_n_flags =
2227 cpu_to_le32(new_rate.rate_n_flags);
2232 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
2235 /* Indicate to uCode which entries might be MIMO.
2236 * If initial rate was MIMO, this will finally end up
2237 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2238 if (is_mimo(tbl_type.lq_type))
2239 lq_cmd->general_params.mimo_delimiter = index;
2242 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
2243 use_ht_possible, &new_rate);
2245 /* How many times should we repeat the next rate? */
2246 if (is_legacy(tbl_type.lq_type)) {
2247 if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2250 rs_toggle_antenna(&new_rate, &tbl_type);
2251 ant_toggle_count = 1;
2253 repeat_rate = IWL_NUMBER_TRY;
2255 repeat_rate = IWL_HT_NUMBER_TRY;
2257 /* Don't allow HT rates after next pass.
2258 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2259 use_ht_possible = 0;
2261 /* Override next rate if needed for debug purposes */
2262 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2264 /* Fill next table entry */
2265 lq_cmd->rs_table[index].rate_n_flags =
2266 cpu_to_le32(new_rate.rate_n_flags);
2272 lq_cmd->general_params.dual_stream_ant_msk = 3;
2273 lq_cmd->agg_params.agg_dis_start_th = 3;
2274 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2277 static void *rs_alloc(struct ieee80211_local *local)
2279 return local->hw.priv;
2281 /* rate scale requires free function to be implemented */
2282 static void rs_free(void *priv_rate)
2287 static void rs_clear(void *priv_rate)
2289 struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2291 IWL_DEBUG_RATE("enter\n");
2293 priv->lq_mngr.lq_ready = 0;
2294 #ifdef CONFIG_IWL4965_HT
2295 #ifdef CONFIG_IWL4965_HT_AGG
2296 if (priv->lq_mngr.agg_ctrl.granted_ba)
2297 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2298 #endif /*CONFIG_IWL4965_HT_AGG */
2299 #endif /* CONFIG_IWL4965_HT */
2301 IWL_DEBUG_RATE("leave\n");
2304 static void rs_free_sta(void *priv, void *priv_sta)
2306 struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2308 IWL_DEBUG_RATE("enter\n");
2310 IWL_DEBUG_RATE("leave\n");
2314 #ifdef CONFIG_MAC80211_DEBUGFS
2315 static int open_file_generic(struct inode *inode, struct file *file)
2317 file->private_data = inode->i_private;
2320 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
2321 struct iwl4965_rate *mcs, int index)
2325 if (rs_priv->phymode == (u8) MODE_IEEE80211A)
2330 if (rs_priv->dbg_fixed.rate_n_flags) {
2332 mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
2334 mcs->rate_n_flags = base_rate;
2335 IWL_DEBUG_RATE("Fixed rate ON\n");
2339 IWL_DEBUG_RATE("Fixed rate OFF\n");
2342 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2343 const char __user *user_buf, size_t count, loff_t *ppos)
2345 struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2350 memset(buf, 0, sizeof(buf));
2351 buf_size = min(count, sizeof(buf) - 1);
2352 if (copy_from_user(buf, user_buf, buf_size))
2355 if (sscanf(buf, "%x", &parsed_rate) == 1)
2356 rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
2358 rs_priv->dbg_fixed.rate_n_flags = 0;
2360 rs_priv->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2361 rs_priv->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2362 rs_priv->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2364 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2365 rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
2367 if (rs_priv->dbg_fixed.rate_n_flags) {
2368 rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
2369 rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
2375 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2376 char __user *user_buf, size_t count, loff_t *ppos)
2382 struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2384 desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2385 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2386 rs_priv->total_failed, rs_priv->total_success,
2387 rs_priv->active_rate);
2388 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2389 rs_priv->dbg_fixed.rate_n_flags);
2390 desc += sprintf(buff+desc, "general:"
2391 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2392 rs_priv->lq.general_params.flags,
2393 rs_priv->lq.general_params.mimo_delimiter,
2394 rs_priv->lq.general_params.single_stream_ant_msk,
2395 rs_priv->lq.general_params.dual_stream_ant_msk);
2397 desc += sprintf(buff+desc, "agg:"
2398 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2399 le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2400 rs_priv->lq.agg_params.agg_dis_start_th,
2401 rs_priv->lq.agg_params.agg_frame_cnt_limit);
2403 desc += sprintf(buff+desc,
2404 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2405 rs_priv->lq.general_params.start_rate_index[0],
2406 rs_priv->lq.general_params.start_rate_index[1],
2407 rs_priv->lq.general_params.start_rate_index[2],
2408 rs_priv->lq.general_params.start_rate_index[3]);
2411 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2412 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2413 i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2415 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2418 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2419 .write = rs_sta_dbgfs_scale_table_write,
2420 .read = rs_sta_dbgfs_scale_table_read,
2421 .open = open_file_generic,
2423 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2424 char __user *user_buf, size_t count, loff_t *ppos)
2430 struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2431 for (i = 0; i < LQ_SIZE; i++) {
2432 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2434 rs_priv->active_tbl == i?"*":"x",
2435 rs_priv->lq_info[i].lq_type,
2436 rs_priv->lq_info[i].is_SGI,
2437 rs_priv->lq_info[i].is_fat,
2438 rs_priv->lq_info[i].is_dup,
2439 rs_priv->lq_info[i].current_rate.rate_n_flags);
2440 for (j = 0; j < IWL_RATE_COUNT; j++) {
2441 desc += sprintf(buff+desc,
2442 "counter=%d success=%d %%=%d\n",
2443 rs_priv->lq_info[i].win[j].counter,
2444 rs_priv->lq_info[i].win[j].success_counter,
2445 rs_priv->lq_info[i].win[j].success_ratio);
2448 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2451 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2452 .read = rs_sta_dbgfs_stats_table_read,
2453 .open = open_file_generic,
2456 static void rs_add_debugfs(void *priv, void *priv_sta,
2459 struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2460 rs_priv->rs_sta_dbgfs_scale_table_file =
2461 debugfs_create_file("rate_scale_table", 0600, dir,
2462 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2463 rs_priv->rs_sta_dbgfs_stats_table_file =
2464 debugfs_create_file("rate_stats_table", 0600, dir,
2465 rs_priv, &rs_sta_dbgfs_stats_table_ops);
2468 static void rs_remove_debugfs(void *priv, void *priv_sta)
2470 struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2471 debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2472 debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
2476 static struct rate_control_ops rs_ops = {
2479 .tx_status = rs_tx_status,
2480 .get_rate = rs_get_rate,
2481 .rate_init = rs_rate_init,
2485 .alloc_sta = rs_alloc_sta,
2486 .free_sta = rs_free_sta,
2487 #ifdef CONFIG_MAC80211_DEBUGFS
2488 .add_sta_debugfs = rs_add_debugfs,
2489 .remove_sta_debugfs = rs_remove_debugfs,
2493 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2495 struct ieee80211_local *local = hw_to_local(hw);
2496 struct iwl4965_priv *priv = hw->priv;
2497 struct iwl4965_rate_scale_priv *rs_priv;
2498 struct sta_info *sta;
2500 u32 samples = 0, success = 0, good = 0;
2501 unsigned long now = jiffies;
2503 u8 lq_type, antenna;
2505 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2506 if (!sta || !sta->rate_ctrl_priv) {
2509 IWL_DEBUG_RATE("leave - no private rate data!\n");
2511 IWL_DEBUG_RATE("leave - no station!\n");
2512 return sprintf(buf, "station %d not found\n", sta_id);
2515 rs_priv = (void *)sta->rate_ctrl_priv;
2517 lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2518 antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2520 if (is_legacy(lq_type))
2521 i = IWL_RATE_54M_INDEX;
2523 i = IWL_RATE_60M_INDEX;
2527 int active = rs_priv->active_tbl;
2530 sprintf(&buf[count], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2532 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2533 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2535 (rs_priv->lq_info[active].win[i].data & mask)
2538 samples += rs_priv->lq_info[active].win[i].counter;
2539 good += rs_priv->lq_info[active].win[i].success_counter;
2540 success += rs_priv->lq_info[active].win[i].success_counter *
2541 iwl4965_rates[i].ieee;
2543 if (rs_priv->lq_info[active].win[i].stamp) {
2545 jiffies_to_msecs(now -
2546 rs_priv->lq_info[active].win[i].stamp);
2548 if (delta > max_time)
2551 count += sprintf(&buf[count], "%5dms\n", delta);
2553 buf[count++] = '\n';
2555 j = iwl4965_get_prev_ieee_rate(i);
2561 /* Display the average rate of all samples taken.
2563 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2564 * added from iwl4965_rates is actually 2X the rate */
2566 count += sprintf(&buf[count],
2567 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2568 "%3d%% success (%d good packets over %d tries)\n",
2569 success / (2 * samples), (success * 5 / samples) % 10,
2570 max_time, good * 100 / samples, good, samples);
2572 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2573 count += sprintf(&buf[count], "\nrate scale type %d antenna %d "
2574 "active_search %d rate index %d\n", lq_type, antenna,
2575 rs_priv->search_better_tbl, sta->last_txrate);
2581 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2583 struct iwl4965_priv *priv = hw->priv;
2585 priv->lq_mngr.lq_ready = 1;
2588 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2590 ieee80211_rate_control_register(&rs_ops);
2593 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2595 ieee80211_rate_control_unregister(&rs_ops);