Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   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.
   8  *
   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
  12  * more details.
  13  *
  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
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  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
  24  *
  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
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-4965.h"
  41 #include "iwl-core.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  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 */
  53
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  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,
  60         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
  65 };
  66
  67 /**
  68  * struct iwl4965_rate_scale_data -- tx success history for one rate
  69  */
  70 struct iwl4965_rate_scale_data {
  71         u64 data;               /* bitmap of successful frames */
  72         s32 success_counter;    /* number of frames successful */
  73         s32 success_ratio;      /* per-cent * 128  */
  74         s32 counter;            /* number of frames attempted */
  75         s32 average_tpt;        /* success ratio * expected throughput */
  76         unsigned long stamp;
  77 };
  78
  79 /**
  80  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  81  *
  82  * There are two of these in struct iwl4965_lq_sta,
  83  * one for "active", and one for "search".
  84  */
  85 struct iwl4965_scale_tbl_info {
  86         enum iwl_table_type lq_type;
  87         u8 ant_type;
  88         u8 is_SGI;      /* 1 = short guard interval */
  89         u8 is_fat;      /* 1 = 40 MHz channel width */
  90         u8 is_dup;      /* 1 = duplicated data streams */
  91         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
  92         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
  93         u32 current_rate;  /* rate_n_flags, uCode API format */
  94         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
  95 };
  96
  97 #ifdef CONFIG_IWL4965_HT
  98
  99 struct iwl4965_traffic_load {
 100         unsigned long time_stamp;       /* age of the oldest statistics */
 101         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 102                                                  * slice */
 103         u32 total;                      /* total num of packets during the
 104                                          * last TID_MAX_TIME_DIFF */
 105         u8 queue_count;                 /* number of queues that has
 106                                          * been used since the last cleanup */
 107         u8 head;                        /* start of the circular buffer */
 108 };
 109
 110 #endif /* CONFIG_IWL4965_HT */
 111
 112 /**
 113  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 114  *
 115  * Pointer to this gets passed back and forth between driver and mac80211.
 116  */
 117 struct iwl4965_lq_sta {
 118         u8 active_tbl;          /* index of active table, range 0-1 */
 119         u8 enable_counter;      /* indicates HT mode */
 120         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 121         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 122         s32 last_tpt;
 123
 124         /* The following determine when to search for a new mode */
 125         u32 table_count_limit;
 126         u32 max_failure_limit;  /* # failed frames before new search */
 127         u32 max_success_limit;  /* # successful frames before new search */
 128         u32 table_count;
 129         u32 total_failed;       /* total failed frames, any/all rates */
 130         u32 total_success;      /* total successful frames, any/all rates */
 131         u32 flush_timer;        /* time staying in mode before new search */
 132
 133         u8 action_counter;      /* # mode-switch actions tried */
 134         u8 antenna;
 135         u8 valid_antenna;
 136         u8 is_green;
 137         u8 is_dup;
 138         enum ieee80211_band band;
 139         u8 ibss_sta_added;
 140
 141         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 142         u32 supp_rates;
 143         u16 active_legacy_rate;
 144         u16 active_siso_rate;
 145         u16 active_mimo2_rate;
 146         u16 active_mimo3_rate;
 147         u16 active_rate_basic;
 148
 149         struct iwl_link_quality_cmd lq;
 150         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 151 #ifdef CONFIG_IWL4965_HT
 152         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 153         u8 tx_agg_tid_en;
 154 #endif
 155 #ifdef CONFIG_MAC80211_DEBUGFS
 156         struct dentry *rs_sta_dbgfs_scale_table_file;
 157         struct dentry *rs_sta_dbgfs_stats_table_file;
 158 #ifdef CONFIG_IWL4965_HT
 159         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 160 #endif
 161         u32 dbg_fixed_rate;
 162         struct iwl_priv *drv;
 163 #endif
 164 };
 165
 166 static void rs_rate_scale_perform(struct iwl_priv *priv,
 167                                    struct net_device *dev,
 168                                    struct ieee80211_hdr *hdr,
 169                                    struct sta_info *sta);
 170 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 171                              struct iwl4965_lq_sta *lq_sta,
 172                              u32 rate_n_flags,
 173                              struct iwl_link_quality_cmd *tbl);
 174
 175
 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);
 179 #else
 180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 181                                         u32 *rate_n_flags, int index)
 182 {}
 183 #endif
 184
 185 /*
 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).
 189  */
 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
 193 };
 194
 195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 201 };
 202
 203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 205 };
 206
 207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 209 };
 210
 211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 213 };
 214
 215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 221 };
 222
 223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 225 };
 226
 227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 229 };
 230
 231 static inline u8 rs_extract_rate(u32 rate_n_flags)
 232 {
 233         return (u8)(rate_n_flags & 0xFF);
 234 }
 235
 236 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 237 {
 238         window->data = 0;
 239         window->success_counter = 0;
 240         window->success_ratio = IWL_INVALID_VALUE;
 241         window->counter = 0;
 242         window->average_tpt = IWL_INVALID_VALUE;
 243         window->stamp = 0;
 244 }
 245
 246 #ifdef CONFIG_IWL4965_HT
 247 /*
 248  *      removes the old data from the statistics. All data that is older than
 249  *      TID_MAX_TIME_DIFF, will be deleted.
 250  */
 251 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 252 {
 253         /* The oldest age we want to keep */
 254         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 255
 256         while (tl->queue_count &&
 257                (tl->time_stamp < oldest_time)) {
 258                 tl->total -= tl->packet_count[tl->head];
 259                 tl->packet_count[tl->head] = 0;
 260                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 261                 tl->queue_count--;
 262                 tl->head++;
 263                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 264                         tl->head = 0;
 265         }
 266 }
 267
 268 /*
 269  *      increment traffic load value for tid and also remove
 270  *      any old values if passed the certain time period
 271  */
 272 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
 273 {
 274         u32 curr_time = jiffies_to_msecs(jiffies);
 275         u32 time_diff;
 276         s32 index;
 277         struct iwl4965_traffic_load *tl = NULL;
 278
 279         if (tid >= TID_MAX_LOAD_COUNT)
 280                 return;
 281
 282         tl = &lq_data->load[tid];
 283
 284         curr_time -= curr_time % TID_ROUND_VALUE;
 285
 286         /* Happens only for the first packet. Initialize the data */
 287         if (!(tl->queue_count)) {
 288                 tl->total = 1;
 289                 tl->time_stamp = curr_time;
 290                 tl->queue_count = 1;
 291                 tl->head = 0;
 292                 tl->packet_count[0] = 1;
 293                 return;
 294         }
 295
 296         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 297         index = time_diff / TID_QUEUE_CELL_SPACING;
 298
 299         /* The history is too long: remove data that is older than */
 300         /* TID_MAX_TIME_DIFF */
 301         if (index >= TID_QUEUE_MAX_SIZE)
 302                 rs_tl_rm_old_stats(tl, curr_time);
 303
 304         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 305         tl->packet_count[index] = tl->packet_count[index] + 1;
 306         tl->total = tl->total + 1;
 307
 308         if ((index + 1) > tl->queue_count)
 309                 tl->queue_count = index + 1;
 310 }
 311
 312 /*
 313         get the traffic load value for tid
 314 */
 315 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 316 {
 317         u32 curr_time = jiffies_to_msecs(jiffies);
 318         u32 time_diff;
 319         s32 index;
 320         struct iwl4965_traffic_load *tl = NULL;
 321
 322         if (tid >= TID_MAX_LOAD_COUNT)
 323                 return 0;
 324
 325         tl = &(lq_data->load[tid]);
 326
 327         curr_time -= curr_time % TID_ROUND_VALUE;
 328
 329         if (!(tl->queue_count))
 330                 return 0;
 331
 332         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 333         index = time_diff / TID_QUEUE_CELL_SPACING;
 334
 335         /* The history is too long: remove data that is older than */
 336         /* TID_MAX_TIME_DIFF */
 337         if (index >= TID_QUEUE_MAX_SIZE)
 338                 rs_tl_rm_old_stats(tl, curr_time);
 339
 340         return tl->total;
 341 }
 342
 343 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 344                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 345                                 struct sta_info *sta)
 346 {
 347         unsigned long state;
 348         DECLARE_MAC_BUF(mac);
 349
 350         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 351         state = sta->ampdu_mlme.tid_state_tx[tid];
 352         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 353
 354         if (state == HT_AGG_STATE_IDLE &&
 355             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 356                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 357                                 print_mac(mac, sta->addr), tid);
 358                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 359         }
 360 }
 361
 362 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 363                                 struct iwl4965_lq_sta *lq_data,
 364                                 struct sta_info *sta)
 365 {
 366         if ((tid < TID_MAX_LOAD_COUNT))
 367                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 368         else if (tid == IWL_AGG_ALL_TID)
 369                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 370                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 371 }
 372
 373 #endif /* CONFIG_IWLWIFI_HT */
 374
 375 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 376 {
 377         return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 378                 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 379                 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
 380 }
 381
 382 /**
 383  * rs_collect_tx_data - Update the success/failure sliding window
 384  *
 385  * We keep a sliding window of the last 62 packets transmitted
 386  * at this rate.  window->data contains the bitmask of successful
 387  * packets.
 388  */
 389 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 390                               int scale_index, s32 tpt, int retries,
 391                               int successes)
 392 {
 393         struct iwl4965_rate_scale_data *window = NULL;
 394         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 395         s32 fail_count;
 396
 397         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 398                 return -EINVAL;
 399
 400         /* Select data for current tx bit rate */
 401         window = &(windows[scale_index]);
 402
 403         /*
 404          * Keep track of only the latest 62 tx frame attempts in this rate's
 405          * history window; anything older isn't really relevant any more.
 406          * If we have filled up the sliding window, drop the oldest attempt;
 407          * if the oldest attempt (highest bit in bitmap) shows "success",
 408          * subtract "1" from the success counter (this is the main reason
 409          * we keep these bitmaps!).
 410          */
 411         while (retries > 0) {
 412                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 413
 414                         /* remove earliest */
 415                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 416
 417                         if (window->data & mask) {
 418                                 window->data &= ~mask;
 419                                 window->success_counter--;
 420                         }
 421                 }
 422
 423                 /* Increment frames-attempted counter */
 424                 window->counter++;
 425
 426                 /* Shift bitmap by one frame (throw away oldest history),
 427                  * OR in "1", and increment "success" if this
 428                  * frame was successful. */
 429                 window->data <<= 1;;
 430                 if (successes > 0) {
 431                         window->success_counter++;
 432                         window->data |= 0x1;
 433                         successes--;
 434                 }
 435
 436                 retries--;
 437         }
 438
 439         /* Calculate current success ratio, avoid divide-by-0! */
 440         if (window->counter > 0)
 441                 window->success_ratio = 128 * (100 * window->success_counter)
 442                                         / window->counter;
 443         else
 444                 window->success_ratio = IWL_INVALID_VALUE;
 445
 446         fail_count = window->counter - window->success_counter;
 447
 448         /* Calculate average throughput, if we have enough history. */
 449         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 450             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 451                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 452         else
 453                 window->average_tpt = IWL_INVALID_VALUE;
 454
 455         /* Tag this window as having been updated */
 456         window->stamp = jiffies;
 457
 458         return 0;
 459 }
 460
 461 /*
 462  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 463  */
 464 /* FIXME:RS:remove this function and put the flags statically in the table */
 465 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
 466                                        int index, u8 use_green)
 467 {
 468         u32 rate_n_flags = 0;
 469
 470         if (is_legacy(tbl->lq_type)) {
 471                 rate_n_flags = iwl4965_rates[index].plcp;
 472                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 473                         rate_n_flags |= RATE_MCS_CCK_MSK;
 474
 475         } else if (is_Ht(tbl->lq_type)) {
 476                 if (index > IWL_LAST_OFDM_RATE) {
 477                         IWL_ERROR("invalid HT rate index %d\n", index);
 478                         index = IWL_LAST_OFDM_RATE;
 479                 }
 480                 rate_n_flags = RATE_MCS_HT_MSK;
 481
 482                 if (is_siso(tbl->lq_type))
 483                         rate_n_flags |= iwl4965_rates[index].plcp_siso;
 484                 else if (is_mimo2(tbl->lq_type))
 485                         rate_n_flags |= iwl4965_rates[index].plcp_mimo2;
 486                 else
 487                         rate_n_flags |= iwl4965_rates[index].plcp_mimo3;
 488         } else {
 489                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 490         }
 491
 492         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 493                                                      RATE_MCS_ANT_ABC_MSK);
 494
 495         if (is_Ht(tbl->lq_type)) {
 496                 if (tbl->is_fat) {
 497                         if (tbl->is_dup)
 498                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 499                         else
 500                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 501                 }
 502                 if (tbl->is_SGI)
 503                         rate_n_flags |= RATE_MCS_SGI_MSK;
 504
 505                 if (use_green) {
 506                         rate_n_flags |= RATE_MCS_GF_MSK;
 507                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 508                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 509                                 IWL_ERROR("GF was set with SGI:SISO\n");
 510                         }
 511                 }
 512         }
 513         return rate_n_flags;
 514 }
 515
 516 /*
 517  * Interpret uCode API's rate_n_flags format,
 518  * fill "search" or "active" tx mode table.
 519  */
 520 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 521                                     enum ieee80211_band band,
 522                                     struct iwl4965_scale_tbl_info *tbl,
 523                                     int *rate_idx)
 524 {
 525         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 526         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 527         u8 mcs;
 528
 529         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 530
 531         if (*rate_idx  == IWL_RATE_INVALID) {
 532                 *rate_idx = -1;
 533                 return -EINVAL;
 534         }
 535         tbl->is_SGI = 0;        /* default legacy setup */
 536         tbl->is_fat = 0;
 537         tbl->is_dup = 0;
 538         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 539         tbl->lq_type = LQ_NONE;
 540
 541         /* legacy rate format */
 542         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 543                 if (num_of_ant == 1) {
 544                         if (band == IEEE80211_BAND_5GHZ)
 545                                 tbl->lq_type = LQ_A;
 546                         else
 547                                 tbl->lq_type = LQ_G;
 548                 }
 549         /* HT rate format */
 550         } else {
 551                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 552                         tbl->is_SGI = 1;
 553
 554                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 555                     (rate_n_flags & RATE_MCS_DUP_MSK))
 556                         tbl->is_fat = 1;
 557
 558                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 559                         tbl->is_dup = 1;
 560
 561                 mcs = rs_extract_rate(rate_n_flags);
 562
 563                 /* SISO */
 564                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 565                         if (num_of_ant == 1)
 566                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 567                 /* MIMO2 */
 568                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 569                         if (num_of_ant == 2)
 570                                 tbl->lq_type = LQ_MIMO2;
 571                 /* MIMO3 */
 572                 } else {
 573                         if (num_of_ant == 3)
 574                                 tbl->lq_type = LQ_MIMO3;
 575                 }
 576         }
 577         return 0;
 578 }
 579 /* FIXME:RS: need to toggle also ANT_C, and also AB,AC,BC */
 580 static inline void rs_toggle_antenna(u32 *rate_n_flags,
 581                                      struct iwl4965_scale_tbl_info *tbl)
 582 {
 583         tbl->ant_type ^= ANT_AB;
 584         *rate_n_flags ^= (RATE_MCS_ANT_A_MSK|RATE_MCS_ANT_B_MSK);
 585 }
 586
 587 /* FIXME:RS: in 4965 we don't use greenfield at all */
 588 static inline u8 rs_use_green(struct iwl_priv *priv,
 589                               struct ieee80211_conf *conf)
 590 {
 591 #ifdef CONFIG_IWL4965_HT
 592         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 593                 priv->current_ht_config.is_green_field &&
 594                 !priv->current_ht_config.non_GF_STA_present);
 595 #else
 596         return 0;
 597 #endif  /* CONFIG_IWL4965_HT */
 598 }
 599
 600 /**
 601  * rs_get_supported_rates - get the available rates
 602  *
 603  * if management frame or broadcast frame only return
 604  * basic available rates.
 605  *
 606  */
 607 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 608                                    struct ieee80211_hdr *hdr,
 609                                    enum iwl_table_type rate_type,
 610                                    u16 *data_rate)
 611 {
 612         if (is_legacy(rate_type))
 613                 *data_rate = lq_sta->active_legacy_rate;
 614         else {
 615                 if (is_siso(rate_type))
 616                         *data_rate = lq_sta->active_siso_rate;
 617                 else if (is_mimo2(rate_type))
 618                         *data_rate = lq_sta->active_mimo2_rate;
 619                 else
 620                         *data_rate = lq_sta->active_mimo3_rate;
 621         }
 622
 623         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 624             lq_sta->active_rate_basic) {
 625                 *data_rate = lq_sta->active_rate_basic;
 626         }
 627 }
 628
 629 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 630 {
 631         u8 high = IWL_RATE_INVALID;
 632         u8 low = IWL_RATE_INVALID;
 633
 634         /* 802.11A or ht walks to the next literal adjacent rate in
 635          * the rate table */
 636         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 637                 int i;
 638                 u32 mask;
 639
 640                 /* Find the previous rate that is in the rate mask */
 641                 i = index - 1;
 642                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 643                         if (rate_mask & mask) {
 644                                 low = i;
 645                                 break;
 646                         }
 647                 }
 648
 649                 /* Find the next rate that is in the rate mask */
 650                 i = index + 1;
 651                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 652                         if (rate_mask & mask) {
 653                                 high = i;
 654                                 break;
 655                         }
 656                 }
 657
 658                 return (high << 8) | low;
 659         }
 660
 661         low = index;
 662         while (low != IWL_RATE_INVALID) {
 663                 low = iwl4965_rates[low].prev_rs;
 664                 if (low == IWL_RATE_INVALID)
 665                         break;
 666                 if (rate_mask & (1 << low))
 667                         break;
 668                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 669         }
 670
 671         high = index;
 672         while (high != IWL_RATE_INVALID) {
 673                 high = iwl4965_rates[high].next_rs;
 674                 if (high == IWL_RATE_INVALID)
 675                         break;
 676                 if (rate_mask & (1 << high))
 677                         break;
 678                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 679         }
 680
 681         return (high << 8) | low;
 682 }
 683
 684 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 685                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 686                              u8 ht_possible)
 687 {
 688         s32 low;
 689         u16 rate_mask;
 690         u16 high_low;
 691         u8 switch_to_legacy = 0;
 692         u8 is_green = lq_sta->is_green;
 693
 694         /* check if we need to switch from HT to legacy rates.
 695          * assumption is that mandatory rates (1Mbps or 6Mbps)
 696          * are always supported (spec demand) */
 697         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 698                 switch_to_legacy = 1;
 699                 scale_index = rs_ht_to_legacy[scale_index];
 700                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 701                         tbl->lq_type = LQ_A;
 702                 else
 703                         tbl->lq_type = LQ_G;
 704
 705                 if (num_of_ant(tbl->ant_type > 1))
 706                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 707
 708                 tbl->is_fat = 0;
 709                 tbl->is_SGI = 0;
 710         }
 711
 712         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
 713
 714         /* Mask with station rate restriction */
 715         if (is_legacy(tbl->lq_type)) {
 716                 /* supp_rates has no CCK bits in A mode */
 717                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 718                         rate_mask  = (u16)(rate_mask &
 719                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 720                 else
 721                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 722         }
 723
 724         /* If we switched from HT to legacy, check current rate */
 725         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 726                 low = scale_index;
 727                 goto out;
 728         }
 729
 730         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 731         low = high_low & 0xff;
 732
 733         if (low == IWL_RATE_INVALID)
 734                 low = scale_index;
 735
 736 out:
 737         return rate_n_flags_from_tbl(tbl, low, is_green);
 738 }
 739
 740 /*
 741  * mac80211 sends us Tx status
 742  */
 743 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 744                          struct sk_buff *skb,
 745                          struct ieee80211_tx_status *tx_resp)
 746 {
 747         int status;
 748         u8 retries;
 749         int rs_index, index = 0;
 750         struct iwl4965_lq_sta *lq_sta;
 751         struct iwl_link_quality_cmd *table;
 752         struct sta_info *sta;
 753         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 754         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 755         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 756         struct ieee80211_hw *hw = local_to_hw(local);
 757         struct iwl4965_rate_scale_data *window = NULL;
 758         struct iwl4965_rate_scale_data *search_win = NULL;
 759         u32 tx_rate;
 760         struct iwl4965_scale_tbl_info tbl_type;
 761         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 762         u8 active_index = 0;
 763         u16 fc = le16_to_cpu(hdr->frame_control);
 764         s32 tpt = 0;
 765
 766         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 767
 768         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 769                 return;
 770
 771         /* This packet was aggregated but doesn't carry rate scale info */
 772         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 773             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 774                 return;
 775
 776         retries = tx_resp->retry_count;
 777
 778         if (retries > 15)
 779                 retries = 15;
 780
 781         rcu_read_lock();
 782
 783         sta = sta_info_get(local, hdr->addr1);
 784
 785         if (!sta || !sta->rate_ctrl_priv)
 786                 goto out;
 787
 788
 789         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 790
 791         if (!priv->lq_mngr.lq_ready)
 792                 goto out;
 793
 794         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 795             !lq_sta->ibss_sta_added)
 796                 goto out;
 797
 798         table = &lq_sta->lq;
 799         active_index = lq_sta->active_tbl;
 800
 801         lq_sta->antenna = lq_sta->valid_antenna;
 802
 803         curr_tbl = &(lq_sta->lq_info[active_index]);
 804         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 805         window = (struct iwl4965_rate_scale_data *)
 806             &(curr_tbl->win[0]);
 807         search_win = (struct iwl4965_rate_scale_data *)
 808             &(search_tbl->win[0]);
 809
 810         /*
 811          * Ignore this Tx frame response if its initial rate doesn't match
 812          * that of latest Link Quality command.  There may be stragglers
 813          * from a previous Link Quality command, but we're no longer interested
 814          * in those; they're either from the "active" mode while we're trying
 815          * to check "search" mode, or a prior "search" mode after we've moved
 816          * to a new "search" mode (which might become the new "active" mode).
 817          */
 818         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 819         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 820         if (priv->band == IEEE80211_BAND_5GHZ)
 821                 rs_index -= IWL_FIRST_OFDM_RATE;
 822
 823         if ((tx_resp->control.tx_rate == NULL) ||
 824             (tbl_type.is_SGI ^
 825                 !!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
 826             (tbl_type.is_fat ^
 827                 !!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
 828             (tbl_type.is_dup ^
 829                 !!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
 830             (tbl_type.ant_type ^ tx_resp->control.antenna_sel_tx) ||
 831             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 832                 !!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
 833             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 834                 !!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
 835             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 836                 tx_resp->control.tx_rate->bitrate)) {
 837                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 838                 goto out;
 839         }
 840
 841         /* Update frame history window with "failure" for each Tx retry. */
 842         while (retries) {
 843                 /* Look up the rate and other info used for each tx attempt.
 844                  * Each tx attempt steps one entry deeper in the rate table. */
 845                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 846                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 847                                           &tbl_type, &rs_index);
 848
 849                 /* If type matches "search" table,
 850                  * add failure to "search" history */
 851                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 852                     (tbl_type.ant_type == search_tbl->ant_type) &&
 853                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 854                         if (search_tbl->expected_tpt)
 855                                 tpt = search_tbl->expected_tpt[rs_index];
 856                         else
 857                                 tpt = 0;
 858                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 859
 860                 /* Else if type matches "current/active" table,
 861                  * add failure to "current/active" history */
 862                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 863                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 864                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 865                         if (curr_tbl->expected_tpt)
 866                                 tpt = curr_tbl->expected_tpt[rs_index];
 867                         else
 868                                 tpt = 0;
 869                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 870                 }
 871
 872                 /* If not searching for a new mode, increment failed counter
 873                  * ... this helps determine when to start searching again */
 874                 if (lq_sta->stay_in_tbl)
 875                         lq_sta->total_failed++;
 876                 --retries;
 877                 index++;
 878
 879         }
 880
 881         /*
 882          * Find (by rate) the history window to update with final Tx attempt;
 883          * if Tx was successful first try, use original rate,
 884          * else look up the rate that was, finally, successful.
 885          */
 886         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 887         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 888
 889         /* Update frame history window with "success" if Tx got ACKed ... */
 890         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 891                 status = 1;
 892         else
 893                 status = 0;
 894
 895         /* If type matches "search" table,
 896          * add final tx status to "search" history */
 897         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 898             (tbl_type.ant_type == search_tbl->ant_type) &&
 899             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 900                 if (search_tbl->expected_tpt)
 901                         tpt = search_tbl->expected_tpt[rs_index];
 902                 else
 903                         tpt = 0;
 904                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 905                         rs_collect_tx_data(search_win, rs_index, tpt,
 906                                            tx_resp->ampdu_ack_len,
 907                                            tx_resp->ampdu_ack_map);
 908                 else
 909                         rs_collect_tx_data(search_win, rs_index, tpt,
 910                                            1, status);
 911         /* Else if type matches "current/active" table,
 912          * add final tx status to "current/active" history */
 913         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 914                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 915                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 916                 if (curr_tbl->expected_tpt)
 917                         tpt = curr_tbl->expected_tpt[rs_index];
 918                 else
 919                         tpt = 0;
 920                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 921                         rs_collect_tx_data(window, rs_index, tpt,
 922                                            tx_resp->ampdu_ack_len,
 923                                            tx_resp->ampdu_ack_map);
 924                 else
 925                         rs_collect_tx_data(window, rs_index, tpt,
 926                                            1, status);
 927         }
 928
 929         /* If not searching for new mode, increment success/failed counter
 930          * ... these help determine when to start searching again */
 931         if (lq_sta->stay_in_tbl) {
 932                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
 933                         lq_sta->total_success += tx_resp->ampdu_ack_map;
 934                         lq_sta->total_failed +=
 935                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
 936                 } else {
 937                         if (status)
 938                                 lq_sta->total_success++;
 939                         else
 940                                 lq_sta->total_failed++;
 941                 }
 942         }
 943
 944         /* See if there's a better rate or modulation mode to try. */
 945         rs_rate_scale_perform(priv, dev, hdr, sta);
 946 out:
 947         rcu_read_unlock();
 948         return;
 949 }
 950
 951 static inline u8 rs_is_ant_connected(u8 valid_antenna, u8 ant_type)
 952 {
 953         return ((ant_type & valid_antenna) == ant_type);
 954 }
 955
 956 /*FIXME:RS: this function should be replaced*/
 957 static u8 rs_is_other_ant_connected(u8 valid_antenna, u8 ant_type)
 958 {
 959         if (ant_type == ANT_B)
 960                 return rs_is_ant_connected(valid_antenna, ANT_A);
 961         else
 962                 return rs_is_ant_connected(valid_antenna, ANT_B);
 963
 964         return 0;
 965 }
 966
 967 /*
 968  * Begin a period of staying with a selected modulation mode.
 969  * Set "stay_in_tbl" flag to prevent any mode switches.
 970  * Set frame tx success limits according to legacy vs. high-throughput,
 971  * and reset overall (spanning all rates) tx success history statistics.
 972  * These control how long we stay using same modulation mode before
 973  * searching for a new mode.
 974  */
 975 static void rs_set_stay_in_table(u8 is_legacy,
 976                                  struct iwl4965_lq_sta *lq_sta)
 977 {
 978         IWL_DEBUG_HT("we are staying in the same table\n");
 979         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 980         if (is_legacy) {
 981                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 982                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 983                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 984         } else {
 985                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 986                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 987                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 988         }
 989         lq_sta->table_count = 0;
 990         lq_sta->total_failed = 0;
 991         lq_sta->total_success = 0;
 992 }
 993
 994 /*
 995  * Find correct throughput table for given mode of modulation
 996  */
 997 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
 998                                       struct iwl4965_scale_tbl_info *tbl)
 999 {
1000         if (is_legacy(tbl->lq_type)) {
1001                 if (!is_a_band(tbl->lq_type))
1002                         tbl->expected_tpt = expected_tpt_G;
1003                 else
1004                         tbl->expected_tpt = expected_tpt_A;
1005         } else if (is_siso(tbl->lq_type)) {
1006                 if (tbl->is_fat && !lq_sta->is_dup)
1007                         if (tbl->is_SGI)
1008                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1009                         else
1010                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1011                 else if (tbl->is_SGI)
1012                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1013                 else
1014                         tbl->expected_tpt = expected_tpt_siso20MHz;
1015
1016         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1017                 if (tbl->is_fat && !lq_sta->is_dup)
1018                         if (tbl->is_SGI)
1019                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1020                         else
1021                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1022                 else if (tbl->is_SGI)
1023                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1024                 else
1025                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1026         } else
1027                 tbl->expected_tpt = expected_tpt_G;
1028 }
1029
1030 #ifdef CONFIG_IWL4965_HT
1031 /*
1032  * Find starting rate for new "search" high-throughput mode of modulation.
1033  * Goal is to find lowest expected rate (under perfect conditions) that is
1034  * above the current measured throughput of "active" mode, to give new mode
1035  * a fair chance to prove itself without too many challenges.
1036  *
1037  * This gets called when transitioning to more aggressive modulation
1038  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1039  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1040  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1041  * bit rate will typically need to increase, but not if performance was bad.
1042  */
1043 static s32 rs_get_best_rate(struct iwl_priv *priv,
1044                             struct iwl4965_lq_sta *lq_sta,
1045                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1046                             u16 rate_mask, s8 index, s8 rate)
1047 {
1048         /* "active" values */
1049         struct iwl4965_scale_tbl_info *active_tbl =
1050             &(lq_sta->lq_info[lq_sta->active_tbl]);
1051         s32 active_sr = active_tbl->win[index].success_ratio;
1052         s32 active_tpt = active_tbl->expected_tpt[index];
1053
1054         /* expected "search" throughput */
1055         s32 *tpt_tbl = tbl->expected_tpt;
1056
1057         s32 new_rate, high, low, start_hi;
1058         u16 high_low;
1059
1060         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1061
1062         for (; ;) {
1063                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1064
1065                 low = high_low & 0xff;
1066                 high = (high_low >> 8) & 0xff;
1067
1068                 /*
1069                  * Lower the "search" bit rate, to give new "search" mode
1070                  * approximately the same throughput as "active" if:
1071                  *
1072                  * 1) "Active" mode has been working modestly well (but not
1073                  *    great), and expected "search" throughput (under perfect
1074                  *    conditions) at candidate rate is above the actual
1075                  *    measured "active" throughput (but less than expected
1076                  *    "active" throughput under perfect conditions).
1077                  * OR
1078                  * 2) "Active" mode has been working perfectly or very well
1079                  *    and expected "search" throughput (under perfect
1080                  *    conditions) at candidate rate is above expected
1081                  *    "active" throughput (under perfect conditions).
1082                  */
1083                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1084                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1085                       (active_sr <= IWL_RATE_HIGH_TH) &&
1086                       (tpt_tbl[rate] <= active_tpt))) ||
1087                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1088                      (tpt_tbl[rate] > active_tpt))) {
1089
1090                         /* (2nd or later pass)
1091                          * If we've already tried to raise the rate, and are
1092                          * now trying to lower it, use the higher rate. */
1093                         if (start_hi != IWL_RATE_INVALID) {
1094                                 new_rate = start_hi;
1095                                 break;
1096                         }
1097
1098                         new_rate = rate;
1099
1100                         /* Loop again with lower rate */
1101                         if (low != IWL_RATE_INVALID)
1102                                 rate = low;
1103
1104                         /* Lower rate not available, use the original */
1105                         else
1106                                 break;
1107
1108                 /* Else try to raise the "search" rate to match "active" */
1109                 } else {
1110                         /* (2nd or later pass)
1111                          * If we've already tried to lower the rate, and are
1112                          * now trying to raise it, use the lower rate. */
1113                         if (new_rate != IWL_RATE_INVALID)
1114                                 break;
1115
1116                         /* Loop again with higher rate */
1117                         else if (high != IWL_RATE_INVALID) {
1118                                 start_hi = high;
1119                                 rate = high;
1120
1121                         /* Higher rate not available, use the original */
1122                         } else {
1123                                 new_rate = rate;
1124                                 break;
1125                         }
1126                 }
1127         }
1128
1129         return new_rate;
1130 }
1131 #endif                          /* CONFIG_IWL4965_HT */
1132
1133 /*FIXME:RS:this function should be replaced*/
1134 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1135 {
1136         return (rs_is_ant_connected(valid_antenna, ANT_AB));
1137 }
1138
1139 /*
1140  * Set up search table for MIMO
1141  */
1142 #ifdef CONFIG_IWL4965_HT
1143 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1144                              struct iwl4965_lq_sta *lq_sta,
1145                              struct ieee80211_conf *conf,
1146                              struct sta_info *sta,
1147                              struct iwl4965_scale_tbl_info *tbl, int index)
1148 {
1149         u16 rate_mask;
1150         s32 rate;
1151         s8 is_green = lq_sta->is_green;
1152
1153         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1154             !sta->ht_info.ht_supported)
1155                 return -1;
1156
1157         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1158                 return -1;
1159
1160         /* Need both Tx chains/antennas to support MIMO */
1161         if (!rs_is_both_ant_supp(priv->hw_params.valid_tx_ant))
1162                 return -1;
1163
1164         IWL_DEBUG_HT("LQ: try to switch to MIMO2\n");
1165
1166         tbl->lq_type = LQ_MIMO2;
1167         tbl->is_dup = lq_sta->is_dup;
1168         tbl->action = 0;
1169         rate_mask = lq_sta->active_mimo2_rate;
1170
1171         if (priv->current_ht_config.supported_chan_width
1172                                         == IWL_CHANNEL_WIDTH_40MHZ)
1173                 tbl->is_fat = 1;
1174         else
1175                 tbl->is_fat = 0;
1176
1177         /* FIXME: - don't toggle SGI here
1178         if (tbl->is_fat) {
1179                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1180                         tbl->is_SGI = 1;
1181                 else
1182                         tbl->is_SGI = 0;
1183         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1184                 tbl->is_SGI = 1;
1185         else
1186                 tbl->is_SGI = 0;
1187         */
1188
1189         rs_get_expected_tpt_table(lq_sta, tbl);
1190
1191         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1192
1193         IWL_DEBUG_HT("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1194
1195         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1196                 IWL_DEBUG_HT("Can't switch with index %d rate mask %x\n",
1197                                                 rate, rate_mask);
1198                 return -1;
1199         }
1200         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1201
1202         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1203                      tbl->current_rate, is_green);
1204         return 0;
1205 }
1206 #else
1207 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1208                              struct iwl4965_lq_sta *lq_sta,
1209                              struct ieee80211_conf *conf,
1210                              struct sta_info *sta,
1211                              struct iwl4965_scale_tbl_info *tbl, int index)
1212 {
1213         return -1;
1214 }
1215 #endif  /*CONFIG_IWL4965_HT */
1216
1217 /*
1218  * Set up search table for SISO
1219  */
1220 static int rs_switch_to_siso(struct iwl_priv *priv,
1221                              struct iwl4965_lq_sta *lq_sta,
1222                              struct ieee80211_conf *conf,
1223                              struct sta_info *sta,
1224                              struct iwl4965_scale_tbl_info *tbl, int index)
1225 {
1226 #ifdef CONFIG_IWL4965_HT
1227         u16 rate_mask;
1228         u8 is_green = lq_sta->is_green;
1229         s32 rate;
1230
1231         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1232             !sta->ht_info.ht_supported)
1233                 return -1;
1234
1235         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1236
1237         tbl->is_dup = lq_sta->is_dup;
1238         tbl->lq_type = LQ_SISO;
1239         tbl->action = 0;
1240         rate_mask = lq_sta->active_siso_rate;
1241
1242         if (priv->current_ht_config.supported_chan_width
1243             == IWL_CHANNEL_WIDTH_40MHZ)
1244                 tbl->is_fat = 1;
1245         else
1246                 tbl->is_fat = 0;
1247
1248         /* FIXME: - don't toggle SGI here
1249         if (tbl->is_fat) {
1250                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1251                         tbl->is_SGI = 1;
1252                 else
1253                         tbl->is_SGI = 0;
1254         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1255                 tbl->is_SGI = 1;
1256         else
1257                 tbl->is_SGI = 0;
1258         */
1259
1260         if (is_green)
1261                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1262
1263         rs_get_expected_tpt_table(lq_sta, tbl);
1264         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1265
1266         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1267         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1268                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1269                              rate, rate_mask);
1270                 return -1;
1271         }
1272         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1273         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1274                      tbl->current_rate, is_green);
1275         return 0;
1276 #else
1277         return -1;
1278
1279 #endif  /*CONFIG_IWL4965_HT */
1280 }
1281
1282 /*
1283  * Try to switch to new modulation mode from legacy
1284  */
1285 static int rs_move_legacy_other(struct iwl_priv *priv,
1286                                 struct iwl4965_lq_sta *lq_sta,
1287                                 struct ieee80211_conf *conf,
1288                                 struct sta_info *sta,
1289                                 int index)
1290 {
1291         struct iwl4965_scale_tbl_info *tbl =
1292             &(lq_sta->lq_info[lq_sta->active_tbl]);
1293         struct iwl4965_scale_tbl_info *search_tbl =
1294             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1295         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1296         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1297                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1298         u8 start_action = tbl->action;
1299         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1300         int ret = 0;
1301
1302         for (; ;) {
1303                 switch (tbl->action) {
1304                 case IWL_LEGACY_SWITCH_ANTENNA:
1305                         IWL_DEBUG_HT("LQ Legacy toggle Antenna\n");
1306
1307                         search_tbl->lq_type = LQ_NONE;
1308                         lq_sta->action_counter++;
1309
1310                         /* Don't change antenna if success has been great */
1311                         /*FIXME:RS:not sure this is really needed*/
1312                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1313                                 break;
1314
1315                         /* Don't change antenna if other one is not connected */
1316                         if (!rs_is_other_ant_connected(valid_tx_ant,
1317                                                         tbl->ant_type))
1318                                 break;
1319
1320                         /* Set up search table to try other antenna */
1321                         memcpy(search_tbl, tbl, sz);
1322
1323                         rs_toggle_antenna(&search_tbl->current_rate,
1324                                            search_tbl);
1325                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1326                         lq_sta->search_better_tbl = 1;
1327                         goto out;
1328
1329                 case IWL_LEGACY_SWITCH_SISO:
1330                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1331
1332                         /* Set up search table to try SISO */
1333                         memcpy(search_tbl, tbl, sz);
1334                         search_tbl->is_SGI = 0;
1335                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1336                                                  search_tbl, index);
1337                         if (!ret) {
1338                                 lq_sta->search_better_tbl = 1;
1339                                 lq_sta->action_counter = 0;
1340                                 goto out;
1341                         }
1342
1343                         break;
1344                 case IWL_LEGACY_SWITCH_MIMO2:
1345                         IWL_DEBUG_HT("LQ: Legacy switch to MIMO2\n");
1346
1347                         /* Set up search table to try MIMO */
1348                         memcpy(search_tbl, tbl, sz);
1349                         search_tbl->is_SGI = 0;
1350                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1351                                 /*FIXME:RS:need to check ant validity*/
1352                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1353                                                  search_tbl, index);
1354                         if (!ret) {
1355                                 lq_sta->search_better_tbl = 1;
1356                                 lq_sta->action_counter = 0;
1357                                 goto out;
1358                         }
1359                         break;
1360                 }
1361                 tbl->action++;
1362                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1363                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1364
1365                 if (tbl->action == start_action)
1366                         break;
1367
1368         }
1369         return 0;
1370
1371  out:
1372         tbl->action++;
1373         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1374                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1375         return 0;
1376
1377 }
1378
1379 /*
1380  * Try to switch to new modulation mode from SISO
1381  */
1382 static int rs_move_siso_to_other(struct iwl_priv *priv,
1383                                  struct iwl4965_lq_sta *lq_sta,
1384                                  struct ieee80211_conf *conf,
1385                                  struct sta_info *sta,
1386                                  int index)
1387 {
1388         u8 is_green = lq_sta->is_green;
1389         struct iwl4965_scale_tbl_info *tbl =
1390             &(lq_sta->lq_info[lq_sta->active_tbl]);
1391         struct iwl4965_scale_tbl_info *search_tbl =
1392             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1393         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1394         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1395                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1396         u8 start_action = tbl->action;
1397         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1398         int ret;
1399
1400         for (;;) {
1401                 lq_sta->action_counter++;
1402                 switch (tbl->action) {
1403                 case IWL_SISO_SWITCH_ANTENNA:
1404                         IWL_DEBUG_HT("LQ: SISO toggle Antenna\n");
1405                         /*FIXME:RS: is this really needed for SISO?*/
1406                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1407                                 break;
1408                         if (!rs_is_other_ant_connected(valid_tx_ant,
1409                                                        tbl->ant_type))
1410                                 break;
1411
1412                         memcpy(search_tbl, tbl, sz);
1413                         rs_toggle_antenna(&search_tbl->current_rate,
1414                                            search_tbl);
1415                         lq_sta->search_better_tbl = 1;
1416
1417                         goto out;
1418
1419                 case IWL_SISO_SWITCH_MIMO2:
1420                         IWL_DEBUG_HT("LQ: SISO switch to MIMO\n");
1421                         memcpy(search_tbl, tbl, sz);
1422                         search_tbl->is_SGI = 0;
1423                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1424                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1425                                                  search_tbl, index);
1426                         if (!ret) {
1427                                 lq_sta->search_better_tbl = 1;
1428                                 goto out;
1429                         }
1430                         break;
1431                 case IWL_SISO_SWITCH_GI:
1432                         IWL_DEBUG_HT("LQ: SISO toggle SGI/NGI\n");
1433
1434                         memcpy(search_tbl, tbl, sz);
1435                         if (is_green) {
1436                                 if (!tbl->is_SGI)
1437                                         break;
1438                                 else
1439                                         IWL_ERROR("SGI was set in GF+SISO\n");
1440                         }
1441                         search_tbl->is_SGI = !tbl->is_SGI;
1442                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1443                         if (tbl->is_SGI) {
1444                                 s32 tpt = lq_sta->last_tpt / 100;
1445                                 if (tpt >= search_tbl->expected_tpt[index])
1446                                         break;
1447                         }
1448                         search_tbl->current_rate = rate_n_flags_from_tbl(
1449                                                 search_tbl, index, is_green);
1450                         lq_sta->search_better_tbl = 1;
1451                         goto out;
1452                 }
1453                 tbl->action++;
1454                 if (tbl->action > IWL_SISO_SWITCH_GI)
1455                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1456
1457                 if (tbl->action == start_action)
1458                         break;
1459         }
1460         return 0;
1461
1462  out:
1463         tbl->action++;
1464         if (tbl->action > IWL_SISO_SWITCH_GI)
1465                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1466         return 0;
1467 }
1468
1469 /*
1470  * Try to switch to new modulation mode from MIMO
1471  */
1472 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1473                                  struct iwl4965_lq_sta *lq_sta,
1474                                  struct ieee80211_conf *conf,
1475                                  struct sta_info *sta,
1476                                  int index)
1477 {
1478         int ret;
1479         s8 is_green = lq_sta->is_green;
1480         struct iwl4965_scale_tbl_info *tbl =
1481             &(lq_sta->lq_info[lq_sta->active_tbl]);
1482         struct iwl4965_scale_tbl_info *search_tbl =
1483             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1484         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1485                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1486         u8 start_action = tbl->action;
1487
1488         for (;;) {
1489                 lq_sta->action_counter++;
1490                 switch (tbl->action) {
1491                 case IWL_MIMO_SWITCH_ANTENNA_A:
1492                 case IWL_MIMO_SWITCH_ANTENNA_B:
1493                         IWL_DEBUG_HT("LQ: MIMO2 switch to SISO\n");
1494
1495                         /* Set up new search table for SISO */
1496                         memcpy(search_tbl, tbl, sz);
1497
1498                         /*FIXME:RS:need to check ant validity + C*/
1499                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1500                                 search_tbl->ant_type = ANT_A;
1501                         else
1502                                 search_tbl->ant_type = ANT_B;
1503
1504                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1505                                                  search_tbl, index);
1506                         if (!ret) {
1507                                 lq_sta->search_better_tbl = 1;
1508                                 goto out;
1509                         }
1510                         break;
1511
1512                 case IWL_MIMO_SWITCH_GI:
1513                         IWL_DEBUG_HT("LQ: MIMO toggle SGI/NGI\n");
1514
1515                         /* Set up new search table for MIMO */
1516                         memcpy(search_tbl, tbl, sz);
1517                         search_tbl->is_SGI = !tbl->is_SGI;
1518                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1519                         /*
1520                          * If active table already uses the fastest possible
1521                          * modulation (dual stream with short guard interval),
1522                          * and it's working well, there's no need to look
1523                          * for a better type of modulation!
1524                          */
1525                         if (tbl->is_SGI) {
1526                                 s32 tpt = lq_sta->last_tpt / 100;
1527                                 if (tpt >= search_tbl->expected_tpt[index])
1528                                         break;
1529                         }
1530                         search_tbl->current_rate = rate_n_flags_from_tbl(
1531                                                 search_tbl, index, is_green);
1532                         lq_sta->search_better_tbl = 1;
1533                         goto out;
1534
1535                 }
1536                 tbl->action++;
1537                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1538                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1539
1540                 if (tbl->action == start_action)
1541                         break;
1542         }
1543
1544         return 0;
1545  out:
1546         tbl->action++;
1547         if (tbl->action > IWL_MIMO_SWITCH_GI)
1548                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1549         return 0;
1550
1551 }
1552
1553 /*
1554  * Check whether we should continue using same modulation mode, or
1555  * begin search for a new mode, based on:
1556  * 1) # tx successes or failures while using this mode
1557  * 2) # times calling this function
1558  * 3) elapsed time in this mode (not used, for now)
1559  */
1560 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1561 {
1562         struct iwl4965_scale_tbl_info *tbl;
1563         int i;
1564         int active_tbl;
1565         int flush_interval_passed = 0;
1566
1567         active_tbl = lq_sta->active_tbl;
1568
1569         tbl = &(lq_sta->lq_info[active_tbl]);
1570
1571         /* If we've been disallowing search, see if we should now allow it */
1572         if (lq_sta->stay_in_tbl) {
1573
1574                 /* Elapsed time using current modulation mode */
1575                 if (lq_sta->flush_timer)
1576                         flush_interval_passed =
1577                             time_after(jiffies,
1578                                        (unsigned long)(lq_sta->flush_timer +
1579                                         IWL_RATE_SCALE_FLUSH_INTVL));
1580
1581                 /* For now, disable the elapsed time criterion */
1582                 flush_interval_passed = 0;
1583
1584                 /*
1585                  * Check if we should allow search for new modulation mode.
1586                  * If many frames have failed or succeeded, or we've used
1587                  * this same modulation for a long time, allow search, and
1588                  * reset history stats that keep track of whether we should
1589                  * allow a new search.  Also (below) reset all bitmaps and
1590                  * stats in active history.
1591                  */
1592                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1593                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1594                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1595                      && (flush_interval_passed))) {
1596                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1597                                      lq_sta->total_failed,
1598                                      lq_sta->total_success,
1599                                      flush_interval_passed);
1600
1601                         /* Allow search for new mode */
1602                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1603                         lq_sta->total_failed = 0;
1604                         lq_sta->total_success = 0;
1605                         lq_sta->flush_timer = 0;
1606
1607                 /*
1608                  * Else if we've used this modulation mode enough repetitions
1609                  * (regardless of elapsed time or success/failure), reset
1610                  * history bitmaps and rate-specific stats for all rates in
1611                  * active table.
1612                  */
1613                 } else {
1614                         lq_sta->table_count++;
1615                         if (lq_sta->table_count >=
1616                             lq_sta->table_count_limit) {
1617                                 lq_sta->table_count = 0;
1618
1619                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1620                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1621                                         rs_rate_scale_clear_window(
1622                                                 &(tbl->win[i]));
1623                         }
1624                 }
1625
1626                 /* If transitioning to allow "search", reset all history
1627                  * bitmaps and stats in active table (this will become the new
1628                  * "search" table). */
1629                 if (!lq_sta->stay_in_tbl) {
1630                         for (i = 0; i < IWL_RATE_COUNT; i++)
1631                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1632                 }
1633         }
1634 }
1635
1636 /*
1637  * Do rate scaling and search for new modulation mode.
1638  */
1639 static void rs_rate_scale_perform(struct iwl_priv *priv,
1640                                   struct net_device *dev,
1641                                   struct ieee80211_hdr *hdr,
1642                                   struct sta_info *sta)
1643 {
1644         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1645         struct ieee80211_hw *hw = local_to_hw(local);
1646         struct ieee80211_conf *conf = &hw->conf;
1647         int low = IWL_RATE_INVALID;
1648         int high = IWL_RATE_INVALID;
1649         int index;
1650         int i;
1651         struct iwl4965_rate_scale_data *window = NULL;
1652         int current_tpt = IWL_INVALID_VALUE;
1653         int low_tpt = IWL_INVALID_VALUE;
1654         int high_tpt = IWL_INVALID_VALUE;
1655         u32 fail_count;
1656         s8 scale_action = 0;
1657         u16 fc, rate_mask;
1658         u8 update_lq = 0;
1659         struct iwl4965_lq_sta *lq_sta;
1660         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1661         u16 rate_scale_index_msk = 0;
1662         u32 rate;
1663         u8 is_green = 0;
1664         u8 active_tbl = 0;
1665         u8 done_search = 0;
1666         u16 high_low;
1667 #ifdef CONFIG_IWL4965_HT
1668         u8 tid = MAX_TID_COUNT;
1669         __le16 *qc;
1670 #endif
1671
1672         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1673
1674         fc = le16_to_cpu(hdr->frame_control);
1675         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1676                 /* Send management frames and broadcast/multicast data using
1677                  * lowest rate. */
1678                 /* TODO: this could probably be improved.. */
1679                 return;
1680         }
1681
1682         if (!sta || !sta->rate_ctrl_priv)
1683                 return;
1684
1685         if (!priv->lq_mngr.lq_ready) {
1686                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1687                 return;
1688         }
1689         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1690
1691 #ifdef CONFIG_IWL4965_HT
1692         qc = ieee80211_get_qos_ctrl(hdr);
1693         if (qc) {
1694                 tid = (u8)(le16_to_cpu(*qc) & 0xf);
1695                 rs_tl_add_packet(lq_sta, tid);
1696         }
1697 #endif
1698         /*
1699          * Select rate-scale / modulation-mode table to work with in
1700          * the rest of this function:  "search" if searching for better
1701          * modulation mode, or "active" if doing rate scaling within a mode.
1702          */
1703         if (!lq_sta->search_better_tbl)
1704                 active_tbl = lq_sta->active_tbl;
1705         else
1706                 active_tbl = 1 - lq_sta->active_tbl;
1707
1708         tbl = &(lq_sta->lq_info[active_tbl]);
1709         is_green = lq_sta->is_green;
1710
1711         /* current tx rate */
1712         index = sta->last_txrate_idx;
1713
1714         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1715                        tbl->lq_type);
1716
1717         /* rates available for this association, and for modulation mode */
1718         rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1719                                 &rate_mask);
1720
1721         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1722
1723         /* mask with station rate restriction */
1724         if (is_legacy(tbl->lq_type)) {
1725                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1726                         /* supp_rates has no CCK bits in A mode */
1727                         rate_scale_index_msk = (u16) (rate_mask &
1728                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1729                 else
1730                         rate_scale_index_msk = (u16) (rate_mask &
1731                                                       lq_sta->supp_rates);
1732
1733         } else
1734                 rate_scale_index_msk = rate_mask;
1735
1736         if (!rate_scale_index_msk)
1737                 rate_scale_index_msk = rate_mask;
1738
1739         /* If current rate is no longer supported on current association,
1740          * or user changed preferences for rates, find a new supported rate. */
1741         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1742                 index = IWL_INVALID_VALUE;
1743                 update_lq = 1;
1744
1745                 /* get the highest available rate */
1746                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1747                         if ((1 << i) & rate_scale_index_msk)
1748                                 index = i;
1749                 }
1750
1751                 if (index == IWL_INVALID_VALUE) {
1752                         IWL_WARNING("Can not find a suitable rate\n");
1753                         return;
1754                 }
1755         }
1756
1757         /* Get expected throughput table and history window for current rate */
1758         if (!tbl->expected_tpt)
1759                 rs_get_expected_tpt_table(lq_sta, tbl);
1760
1761         window = &(tbl->win[index]);
1762
1763         /*
1764          * If there is not enough history to calculate actual average
1765          * throughput, keep analyzing results of more tx frames, without
1766          * changing rate or mode (bypass most of the rest of this function).
1767          * Set up new rate table in uCode only if old rate is not supported
1768          * in current association (use new rate found above).
1769          */
1770         fail_count = window->counter - window->success_counter;
1771         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1772              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1773             || (tbl->expected_tpt == NULL)) {
1774                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1775                                "for index %d\n",
1776                                window->success_counter, window->counter, index);
1777
1778                 /* Can't calculate this yet; not enough history */
1779                 window->average_tpt = IWL_INVALID_VALUE;
1780
1781                 /* Should we stay with this modulation mode,
1782                  * or search for a new one? */
1783                 rs_stay_in_table(lq_sta);
1784
1785                 /* Set up new rate table in uCode, if needed */
1786                 if (update_lq) {
1787                         rate = rate_n_flags_from_tbl(tbl, index, is_green);
1788                         rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
1789                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1790                 }
1791                 goto out;
1792
1793         /* Else we have enough samples; calculate estimate of
1794          * actual average throughput */
1795         } else
1796                 window->average_tpt = ((window->success_ratio *
1797                                         tbl->expected_tpt[index] + 64) / 128);
1798
1799         /* If we are searching for better modulation mode, check success. */
1800         if (lq_sta->search_better_tbl) {
1801                 int success_limit = IWL_RATE_SCALE_SWITCH;
1802
1803                 /* If good success, continue using the "search" mode;
1804                  * no need to send new link quality command, since we're
1805                  * continuing to use the setup that we've been trying. */
1806                 if ((window->success_ratio > success_limit) ||
1807                     (window->average_tpt > lq_sta->last_tpt)) {
1808                         if (!is_legacy(tbl->lq_type)) {
1809                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1810                                              " rate suc %d current tpt %d"
1811                                              " old tpt %d\n",
1812                                              window->success_ratio,
1813                                              window->average_tpt,
1814                                              lq_sta->last_tpt);
1815                                 lq_sta->enable_counter = 1;
1816                         }
1817                         /* Swap tables; "search" becomes "active" */
1818                         lq_sta->active_tbl = active_tbl;
1819                         current_tpt = window->average_tpt;
1820
1821                 /* Else poor success; go back to mode in "active" table */
1822                 } else {
1823                         /* Nullify "search" table */
1824                         tbl->lq_type = LQ_NONE;
1825
1826                         /* Revert to "active" table */
1827                         active_tbl = lq_sta->active_tbl;
1828                         tbl = &(lq_sta->lq_info[active_tbl]);
1829
1830                         /* Revert to "active" rate and throughput info */
1831                         index = iwl4965_hwrate_to_plcp_idx(
1832                                                         tbl->current_rate);
1833                         current_tpt = lq_sta->last_tpt;
1834
1835                         /* Need to set up a new rate table in uCode */
1836                         update_lq = 1;
1837                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1838                 }
1839
1840                 /* Either way, we've made a decision; modulation mode
1841                  * search is done, allow rate adjustment next time. */
1842                 lq_sta->search_better_tbl = 0;
1843                 done_search = 1;        /* Don't switch modes below! */
1844                 goto lq_update;
1845         }
1846
1847         /* (Else) not in search of better modulation mode, try for better
1848          * starting rate, while staying in this mode. */
1849         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1850                                         tbl->lq_type);
1851         low = high_low & 0xff;
1852         high = (high_low >> 8) & 0xff;
1853
1854         /* Collect measured throughputs for current and adjacent rates */
1855         current_tpt = window->average_tpt;
1856         if (low != IWL_RATE_INVALID)
1857                 low_tpt = tbl->win[low].average_tpt;
1858         if (high != IWL_RATE_INVALID)
1859                 high_tpt = tbl->win[high].average_tpt;
1860
1861         /* Assume rate increase */
1862         scale_action = 1;
1863
1864         /* Too many failures, decrease rate */
1865         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1866             (current_tpt == 0)) {
1867                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1868                 scale_action = -1;
1869
1870         /* No throughput measured yet for adjacent rates; try increase. */
1871         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1872                    (high_tpt == IWL_INVALID_VALUE))
1873                 scale_action = 1;
1874
1875         /* Both adjacent throughputs are measured, but neither one has better
1876          * throughput; we're using the best rate, don't change it! */
1877         else if ((low_tpt != IWL_INVALID_VALUE) &&
1878                  (high_tpt != IWL_INVALID_VALUE) &&
1879                  (low_tpt < current_tpt) &&
1880                  (high_tpt < current_tpt))
1881                 scale_action = 0;
1882
1883         /* At least one adjacent rate's throughput is measured,
1884          * and may have better performance. */
1885         else {
1886                 /* Higher adjacent rate's throughput is measured */
1887                 if (high_tpt != IWL_INVALID_VALUE) {
1888                         /* Higher rate has better throughput */
1889                         if (high_tpt > current_tpt)
1890                                 scale_action = 1;
1891                         else {
1892                                 IWL_DEBUG_RATE
1893                                     ("decrease rate because of high tpt\n");
1894                                 scale_action = -1;
1895                         }
1896
1897                 /* Lower adjacent rate's throughput is measured */
1898                 } else if (low_tpt != IWL_INVALID_VALUE) {
1899                         /* Lower rate has better throughput */
1900                         if (low_tpt > current_tpt) {
1901                                 IWL_DEBUG_RATE
1902                                     ("decrease rate because of low tpt\n");
1903                                 scale_action = -1;
1904                         } else
1905                                 scale_action = 1;
1906                 }
1907         }
1908
1909         /* Sanity check; asked for decrease, but success rate or throughput
1910          * has been good at old rate.  Don't change it. */
1911         if (scale_action == -1) {
1912                 if ((low != IWL_RATE_INVALID) &&
1913                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1914                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1915                         scale_action = 0;
1916
1917         /* Sanity check; asked for increase, but success rate has not been great
1918          * even at old rate, higher rate will be worse.  Don't change it. */
1919         } else if ((scale_action == 1) &&
1920                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1921                 scale_action = 0;
1922
1923         switch (scale_action) {
1924         case -1:
1925                 /* Decrease starting rate, update uCode's rate table */
1926                 if (low != IWL_RATE_INVALID) {
1927                         update_lq = 1;
1928                         index = low;
1929                 }
1930                 break;
1931         case 1:
1932                 /* Increase starting rate, update uCode's rate table */
1933                 if (high != IWL_RATE_INVALID) {
1934                         update_lq = 1;
1935                         index = high;
1936                 }
1937
1938                 break;
1939         case 0:
1940                 /* No change */
1941         default:
1942                 break;
1943         }
1944
1945         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1946                     "high %d type %d\n",
1947                      index, scale_action, low, high, tbl->lq_type);
1948
1949  lq_update:
1950         /* Replace uCode's rate table for the destination station. */
1951         if (update_lq) {
1952                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1953                 rs_fill_link_cmd(priv, lq_sta, rate, &lq_sta->lq);
1954                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1955         }
1956
1957         /* Should we stay with this modulation mode, or search for a new one? */
1958         rs_stay_in_table(lq_sta);
1959
1960         /*
1961          * Search for new modulation mode if we're:
1962          * 1)  Not changing rates right now
1963          * 2)  Not just finishing up a search
1964          * 3)  Allowing a new search
1965          */
1966         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1967                 /* Save current throughput to compare with "search" throughput*/
1968                 lq_sta->last_tpt = current_tpt;
1969
1970                 /* Select a new "search" modulation mode to try.
1971                  * If one is found, set up the new "search" table. */
1972                 if (is_legacy(tbl->lq_type))
1973                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1974                 else if (is_siso(tbl->lq_type))
1975                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1976                 else
1977                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1978
1979                 /* If new "search" mode was selected, set up in uCode table */
1980                 if (lq_sta->search_better_tbl) {
1981                         /* Access the "search" table, clear its history. */
1982                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1983                         for (i = 0; i < IWL_RATE_COUNT; i++)
1984                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1985
1986                         /* Use new "search" start rate */
1987                         index = iwl4965_hwrate_to_plcp_idx(
1988                                                         tbl->current_rate);
1989
1990                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1991                                      tbl->current_rate, index);
1992                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate,
1993                                          &lq_sta->lq);
1994                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1995                 }
1996
1997                 /* If the "active" (non-search) mode was legacy,
1998                  * and we've tried switching antennas,
1999                  * but we haven't been able to try HT modes (not available),
2000                  * stay with best antenna legacy modulation for a while
2001                  * before next round of mode comparisons. */
2002                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2003                 if (is_legacy(tbl1->lq_type) &&
2004 #ifdef CONFIG_IWL4965_HT
2005                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2006 #endif
2007                     (lq_sta->action_counter >= 1)) {
2008                         lq_sta->action_counter = 0;
2009                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
2010                         rs_set_stay_in_table(1, lq_sta);
2011                 }
2012
2013                 /* If we're in an HT mode, and all 3 mode switch actions
2014                  * have been tried and compared, stay in this best modulation
2015                  * mode for a while before next round of mode comparisons. */
2016                 if (lq_sta->enable_counter &&
2017                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2018 #ifdef CONFIG_IWL4965_HT
2019                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2020                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2021                             (tid != MAX_TID_COUNT)) {
2022                                 IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
2023                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2024                         }
2025 #endif /*CONFIG_IWL4965_HT */
2026                         lq_sta->action_counter = 0;
2027                         rs_set_stay_in_table(0, lq_sta);
2028                 }
2029
2030         /*
2031          * Else, don't search for a new modulation mode.
2032          * Put new timestamp in stay-in-modulation-mode flush timer if:
2033          * 1)  Not changing rates right now
2034          * 2)  Not just finishing up a search
2035          * 3)  flush timer is empty
2036          */
2037         } else {
2038                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2039                         lq_sta->flush_timer = jiffies;
2040         }
2041
2042 out:
2043         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2044         i = index;
2045         sta->last_txrate_idx = i;
2046
2047         /* sta->txrate_idx is an index to A mode rates which start
2048          * at IWL_FIRST_OFDM_RATE
2049          */
2050         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2051                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2052         else
2053                 sta->txrate_idx = i;
2054
2055         return;
2056 }
2057
2058
2059 static void rs_initialize_lq(struct iwl_priv *priv,
2060                              struct ieee80211_conf *conf,
2061                              struct sta_info *sta)
2062 {
2063         int i;
2064         struct iwl4965_lq_sta *lq_sta;
2065         struct iwl4965_scale_tbl_info *tbl;
2066         u8 active_tbl = 0;
2067         int rate_idx;
2068         u8 use_green = rs_use_green(priv, conf);
2069         u32 rate;
2070
2071         if (!sta || !sta->rate_ctrl_priv)
2072                 goto out;
2073
2074         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2075         i = sta->last_txrate_idx;
2076
2077         if ((lq_sta->lq.sta_id == 0xff) &&
2078             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2079                 goto out;
2080
2081         if (!lq_sta->search_better_tbl)
2082                 active_tbl = lq_sta->active_tbl;
2083         else
2084                 active_tbl = 1 - lq_sta->active_tbl;
2085
2086         tbl = &(lq_sta->lq_info[active_tbl]);
2087
2088         if ((i < 0) || (i >= IWL_RATE_COUNT))
2089                 i = 0;
2090
2091         /* FIXME:RS: This is also wrong in 4965 */
2092         rate = iwl4965_rates[i].plcp;
2093         rate |= RATE_MCS_ANT_B_MSK;
2094         rate &= ~RATE_MCS_ANT_A_MSK;
2095
2096         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2097                 rate |= RATE_MCS_CCK_MSK;
2098
2099         tbl->ant_type = ANT_B;
2100         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2101         if (!rs_is_ant_connected(priv->hw_params.valid_tx_ant, tbl->ant_type))
2102             rs_toggle_antenna(&rate, tbl);
2103
2104         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2105         tbl->current_rate = rate;
2106         rs_get_expected_tpt_table(lq_sta, tbl);
2107         rs_fill_link_cmd(NULL, lq_sta, rate, &lq_sta->lq);
2108         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2109  out:
2110         return;
2111 }
2112
2113 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2114                         struct ieee80211_supported_band *sband,
2115                         struct sk_buff *skb,
2116                         struct rate_selection *sel)
2117 {
2118
2119         int i;
2120         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2121         struct ieee80211_conf *conf = &local->hw.conf;
2122         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2123         struct sta_info *sta;
2124         u16 fc;
2125         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2126         struct iwl4965_lq_sta *lq_sta;
2127
2128         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2129
2130         rcu_read_lock();
2131
2132         sta = sta_info_get(local, hdr->addr1);
2133
2134         /* Send management frames and broadcast/multicast data using lowest
2135          * rate. */
2136         fc = le16_to_cpu(hdr->frame_control);
2137         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2138             !sta || !sta->rate_ctrl_priv) {
2139                 sel->rate = rate_lowest(local, sband, sta);
2140                 goto out;
2141         }
2142
2143         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2144         i = sta->last_txrate_idx;
2145
2146         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2147             !lq_sta->ibss_sta_added) {
2148                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2149                 DECLARE_MAC_BUF(mac);
2150
2151                 if (sta_id == IWL_INVALID_STATION) {
2152                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2153                                        print_mac(mac, hdr->addr1));
2154                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2155                                                         0, CMD_ASYNC, NULL);
2156                 }
2157                 if ((sta_id != IWL_INVALID_STATION)) {
2158                         lq_sta->lq.sta_id = sta_id;
2159                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2160                         lq_sta->ibss_sta_added = 1;
2161                         rs_initialize_lq(priv, conf, sta);
2162                 }
2163                 if (!lq_sta->ibss_sta_added)
2164                         goto done;
2165         }
2166
2167 done:
2168         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2169                 sel->rate = rate_lowest(local, sband, sta);
2170                 goto out;
2171         }
2172
2173         sel->rate = &priv->ieee_rates[i];
2174 out:
2175         rcu_read_unlock();
2176 }
2177
2178 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2179 {
2180         struct iwl4965_lq_sta *lq_sta;
2181         int i, j;
2182
2183         IWL_DEBUG_RATE("create station rate scale window\n");
2184
2185         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2186
2187         if (lq_sta == NULL)
2188                 return NULL;
2189         lq_sta->lq.sta_id = 0xff;
2190
2191
2192         for (j = 0; j < LQ_SIZE; j++)
2193                 for (i = 0; i < IWL_RATE_COUNT; i++)
2194                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2195
2196         return lq_sta;
2197 }
2198
2199 static void rs_rate_init(void *priv_rate, void *priv_sta,
2200                          struct ieee80211_local *local,
2201                          struct sta_info *sta)
2202 {
2203         int i, j;
2204         struct ieee80211_conf *conf = &local->hw.conf;
2205         struct ieee80211_supported_band *sband;
2206         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2207         struct iwl4965_lq_sta *lq_sta = priv_sta;
2208
2209         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2210
2211         lq_sta->flush_timer = 0;
2212         lq_sta->supp_rates = sta->supp_rates[sband->band];
2213         sta->txrate_idx = 3;
2214         for (j = 0; j < LQ_SIZE; j++)
2215                 for (i = 0; i < IWL_RATE_COUNT; i++)
2216                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2217
2218         IWL_DEBUG_RATE("rate scale global init\n");
2219         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2220          * the lowest or the highest rate.. Could consider using RSSI from
2221          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2222          * after assoc.. */
2223
2224         lq_sta->ibss_sta_added = 0;
2225         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2226                 u8 sta_id = iwl_find_station(priv, sta->addr);
2227                 DECLARE_MAC_BUF(mac);
2228
2229                 /* for IBSS the call are from tasklet */
2230                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2231                              print_mac(mac, sta->addr));
2232
2233                 if (sta_id == IWL_INVALID_STATION) {
2234                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2235                                        print_mac(mac, sta->addr));
2236                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2237                                                         0, CMD_ASYNC, NULL);
2238                 }
2239                 if ((sta_id != IWL_INVALID_STATION)) {
2240                         lq_sta->lq.sta_id = sta_id;
2241                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2242                 }
2243                 /* FIXME: this is w/a remove it later */
2244                 priv->assoc_station_added = 1;
2245         }
2246
2247         /* Find highest tx rate supported by hardware and destination station */
2248         for (i = 0; i < sband->n_bitrates; i++)
2249                 if (sta->supp_rates[sband->band] & BIT(i))
2250                         sta->txrate_idx = i;
2251
2252         sta->last_txrate_idx = sta->txrate_idx;
2253         /* WTF is with this bogus comment? A doesn't have cck rates */
2254         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2255         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2256                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2257
2258         lq_sta->is_dup = 0;
2259         lq_sta->is_green = rs_use_green(priv, conf);
2260         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2261         lq_sta->active_rate_basic = priv->active_rate_basic;
2262         lq_sta->band = priv->band;
2263 #ifdef CONFIG_IWL4965_HT
2264         /*
2265          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2266          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2267          */
2268         lq_sta->active_siso_rate =
2269                 priv->current_ht_config.supp_mcs_set[0] << 1;
2270         lq_sta->active_siso_rate |=
2271                 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2272         lq_sta->active_siso_rate &= ~((u16)0x2);
2273         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2274
2275         /* Same here */
2276         lq_sta->active_mimo2_rate =
2277                 priv->current_ht_config.supp_mcs_set[1] << 1;
2278         lq_sta->active_mimo2_rate |=
2279                 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2280         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2281         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2282
2283         lq_sta->active_mimo3_rate =
2284                 priv->current_ht_config.supp_mcs_set[2] << 1;
2285         lq_sta->active_mimo3_rate |=
2286                 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2287         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2288         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2289
2290         IWL_DEBUG_HT("SISO RATE %X MIMO2 RATE %X MIMO3 RATE %X\n",
2291                      lq_sta->active_siso_rate,
2292                      lq_sta->active_mimo2_rate,
2293                      lq_sta->active_mimo3_rate);
2294
2295         /* as default allow aggregation for all tids */
2296         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2297 #endif /*CONFIG_IWL4965_HT*/
2298 #ifdef CONFIG_MAC80211_DEBUGFS
2299         lq_sta->drv = priv;
2300 #endif
2301
2302         if (priv->assoc_station_added)
2303                 priv->lq_mngr.lq_ready = 1;
2304
2305         rs_initialize_lq(priv, conf, sta);
2306 }
2307
2308 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2309                              struct iwl4965_lq_sta *lq_sta,
2310                              u32 new_rate,
2311                              struct iwl_link_quality_cmd *lq_cmd)
2312 {
2313         int index = 0;
2314         int rate_idx;
2315         int repeat_rate = 0;
2316         u8 ant_toggle_count = 0;
2317         u8 use_ht_possible = 1;
2318         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2319
2320         /* Override starting rate (index 0) if needed for debug purposes */
2321         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2322
2323         /* Interpret new_rate (rate_n_flags) */
2324         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2325                                   &tbl_type, &rate_idx);
2326
2327         /* How many times should we repeat the initial rate? */
2328         if (is_legacy(tbl_type.lq_type)) {
2329                 ant_toggle_count = 1;
2330                 repeat_rate = IWL_NUMBER_TRY;
2331         } else
2332                 repeat_rate = IWL_HT_NUMBER_TRY;
2333
2334         lq_cmd->general_params.mimo_delimiter =
2335                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2336
2337         /* Fill 1st table entry (index 0) */
2338         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2339
2340         /*FIXME:RS*/
2341         if (is_mimo(tbl_type.lq_type) || (tbl_type.ant_type == ANT_A))
2342                 lq_cmd->general_params.single_stream_ant_msk
2343                         = LINK_QUAL_ANT_A_MSK;
2344         else
2345                 lq_cmd->general_params.single_stream_ant_msk
2346                         = LINK_QUAL_ANT_B_MSK;
2347
2348         index++;
2349         repeat_rate--;
2350
2351         /* Fill rest of rate table */
2352         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2353                 /* Repeat initial/next rate.
2354                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2355                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2356                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2357                         if (is_legacy(tbl_type.lq_type)) {
2358                                 if (ant_toggle_count <
2359                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2360                                         ant_toggle_count++;
2361                                 else if (priv && rs_is_other_ant_connected(
2362                                                 priv->hw_params.valid_tx_ant,
2363                                                 tbl_type.ant_type)) {
2364                                         rs_toggle_antenna(&new_rate, &tbl_type);
2365                                         ant_toggle_count = 1;
2366                                 }
2367                         }
2368
2369                         /* Override next rate if needed for debug purposes */
2370                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2371
2372                         /* Fill next table entry */
2373                         lq_cmd->rs_table[index].rate_n_flags =
2374                                         cpu_to_le32(new_rate);
2375                         repeat_rate--;
2376                         index++;
2377                 }
2378
2379                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2380                                                 &rate_idx);
2381
2382                 /* Indicate to uCode which entries might be MIMO.
2383                  * If initial rate was MIMO, this will finally end up
2384                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2385                 if (is_mimo(tbl_type.lq_type))
2386                         lq_cmd->general_params.mimo_delimiter = index;
2387
2388                 /* Get next rate */
2389                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2390                                              use_ht_possible);
2391
2392                 /* How many times should we repeat the next rate? */
2393                 if (is_legacy(tbl_type.lq_type)) {
2394                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2395                                 ant_toggle_count++;
2396                         else if (priv && rs_is_other_ant_connected(
2397                                                 priv->hw_params.valid_tx_ant,
2398                                                 tbl_type.ant_type)) {
2399                                 rs_toggle_antenna(&new_rate, &tbl_type);
2400                                 ant_toggle_count = 1;
2401                         }
2402                         repeat_rate = IWL_NUMBER_TRY;
2403                 } else
2404                         repeat_rate = IWL_HT_NUMBER_TRY;
2405
2406                 /* Don't allow HT rates after next pass.
2407                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2408                 use_ht_possible = 0;
2409
2410                 /* Override next rate if needed for debug purposes */
2411                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2412
2413                 /* Fill next table entry */
2414                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2415
2416                 index++;
2417                 repeat_rate--;
2418         }
2419
2420         lq_cmd->general_params.dual_stream_ant_msk = 3;
2421         lq_cmd->agg_params.agg_dis_start_th = 3;
2422         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2423 }
2424
2425 static void *rs_alloc(struct ieee80211_local *local)
2426 {
2427         return local->hw.priv;
2428 }
2429 /* rate scale requires free function to be implemented */
2430 static void rs_free(void *priv_rate)
2431 {
2432         return;
2433 }
2434
2435 static void rs_clear(void *priv_rate)
2436 {
2437         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2438
2439         IWL_DEBUG_RATE("enter\n");
2440
2441         priv->lq_mngr.lq_ready = 0;
2442
2443         IWL_DEBUG_RATE("leave\n");
2444 }
2445
2446 static void rs_free_sta(void *priv, void *priv_sta)
2447 {
2448         struct iwl4965_lq_sta *lq_sta = priv_sta;
2449
2450         IWL_DEBUG_RATE("enter\n");
2451         kfree(lq_sta);
2452         IWL_DEBUG_RATE("leave\n");
2453 }
2454
2455
2456 #ifdef CONFIG_MAC80211_DEBUGFS
2457 static int open_file_generic(struct inode *inode, struct file *file)
2458 {
2459         file->private_data = inode->i_private;
2460         return 0;
2461 }
2462 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2463                                 u32 *rate_n_flags, int index)
2464 {
2465         if (lq_sta->dbg_fixed_rate) {
2466                 if (index < 12) {
2467                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2468                 } else {
2469                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2470                                 *rate_n_flags = 0x800D;
2471                         else
2472                                 *rate_n_flags = 0x820A;
2473                 }
2474                 IWL_DEBUG_RATE("Fixed rate ON\n");
2475         } else {
2476                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2477         }
2478 }
2479
2480 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2481                         const char __user *user_buf, size_t count, loff_t *ppos)
2482 {
2483         struct iwl4965_lq_sta *lq_sta = file->private_data;
2484         char buf[64];
2485         int buf_size;
2486         u32 parsed_rate;
2487
2488         memset(buf, 0, sizeof(buf));
2489         buf_size = min(count, sizeof(buf) -  1);
2490         if (copy_from_user(buf, user_buf, buf_size))
2491                 return -EFAULT;
2492
2493         if (sscanf(buf, "%x", &parsed_rate) == 1)
2494                 lq_sta->dbg_fixed_rate = parsed_rate;
2495         else
2496                 lq_sta->dbg_fixed_rate = 0;
2497
2498         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2499         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2500         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2501         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2502
2503         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2504                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2505
2506         if (lq_sta->dbg_fixed_rate) {
2507                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate,
2508                                                                 &lq_sta->lq);
2509                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2510         }
2511
2512         return count;
2513 }
2514
2515 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2516                         char __user *user_buf, size_t count, loff_t *ppos)
2517 {
2518         char buff[1024];
2519         int desc = 0;
2520         int i = 0;
2521
2522         struct iwl4965_lq_sta *lq_sta = file->private_data;
2523
2524         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2525         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2526                         lq_sta->total_failed, lq_sta->total_success,
2527                         lq_sta->active_legacy_rate);
2528         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2529                         lq_sta->dbg_fixed_rate);
2530         desc += sprintf(buff+desc, "general:"
2531                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2532                 lq_sta->lq.general_params.flags,
2533                 lq_sta->lq.general_params.mimo_delimiter,
2534                 lq_sta->lq.general_params.single_stream_ant_msk,
2535                 lq_sta->lq.general_params.dual_stream_ant_msk);
2536
2537         desc += sprintf(buff+desc, "agg:"
2538                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2539                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2540                         lq_sta->lq.agg_params.agg_dis_start_th,
2541                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2542
2543         desc += sprintf(buff+desc,
2544                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2545                         lq_sta->lq.general_params.start_rate_index[0],
2546                         lq_sta->lq.general_params.start_rate_index[1],
2547                         lq_sta->lq.general_params.start_rate_index[2],
2548                         lq_sta->lq.general_params.start_rate_index[3]);
2549
2550
2551         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2552                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2553                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2554
2555         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2556 }
2557
2558 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2559         .write = rs_sta_dbgfs_scale_table_write,
2560         .read = rs_sta_dbgfs_scale_table_read,
2561         .open = open_file_generic,
2562 };
2563 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2564                         char __user *user_buf, size_t count, loff_t *ppos)
2565 {
2566         char buff[1024];
2567         int desc = 0;
2568         int i, j;
2569
2570         struct iwl4965_lq_sta *lq_sta = file->private_data;
2571         for (i = 0; i < LQ_SIZE; i++) {
2572                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2573                                 "rate=0x%X\n",
2574                                 lq_sta->active_tbl == i?"*":"x",
2575                                 lq_sta->lq_info[i].lq_type,
2576                                 lq_sta->lq_info[i].is_SGI,
2577                                 lq_sta->lq_info[i].is_fat,
2578                                 lq_sta->lq_info[i].is_dup,
2579                                 lq_sta->lq_info[i].current_rate);
2580                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2581                         desc += sprintf(buff+desc,
2582                                 "counter=%d success=%d %%=%d\n",
2583                                 lq_sta->lq_info[i].win[j].counter,
2584                                 lq_sta->lq_info[i].win[j].success_counter,
2585                                 lq_sta->lq_info[i].win[j].success_ratio);
2586                 }
2587         }
2588         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2589 }
2590
2591 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2592         .read = rs_sta_dbgfs_stats_table_read,
2593         .open = open_file_generic,
2594 };
2595
2596 static void rs_add_debugfs(void *priv, void *priv_sta,
2597                                         struct dentry *dir)
2598 {
2599         struct iwl4965_lq_sta *lq_sta = priv_sta;
2600         lq_sta->rs_sta_dbgfs_scale_table_file =
2601                 debugfs_create_file("rate_scale_table", 0600, dir,
2602                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2603         lq_sta->rs_sta_dbgfs_stats_table_file =
2604                 debugfs_create_file("rate_stats_table", 0600, dir,
2605                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2606 #ifdef CONFIG_IWL4965_HT
2607         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2608                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2609                 &lq_sta->tx_agg_tid_en);
2610 #endif
2611
2612 }
2613
2614 static void rs_remove_debugfs(void *priv, void *priv_sta)
2615 {
2616         struct iwl4965_lq_sta *lq_sta = priv_sta;
2617         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2618         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2619 #ifdef CONFIG_IWL4965_HT
2620         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2621 #endif
2622 }
2623 #endif
2624
2625 static struct rate_control_ops rs_ops = {
2626         .module = NULL,
2627         .name = RS_NAME,
2628         .tx_status = rs_tx_status,
2629         .get_rate = rs_get_rate,
2630         .rate_init = rs_rate_init,
2631         .clear = rs_clear,
2632         .alloc = rs_alloc,
2633         .free = rs_free,
2634         .alloc_sta = rs_alloc_sta,
2635         .free_sta = rs_free_sta,
2636 #ifdef CONFIG_MAC80211_DEBUGFS
2637         .add_sta_debugfs = rs_add_debugfs,
2638         .remove_sta_debugfs = rs_remove_debugfs,
2639 #endif
2640 };
2641
2642 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2643 {
2644         struct ieee80211_local *local = hw_to_local(hw);
2645         struct iwl_priv *priv = hw->priv;
2646         struct iwl4965_lq_sta *lq_sta;
2647         struct sta_info *sta;
2648         int cnt = 0, i;
2649         u32 samples = 0, success = 0, good = 0;
2650         unsigned long now = jiffies;
2651         u32 max_time = 0;
2652         u8 lq_type, antenna;
2653
2654         rcu_read_lock();
2655
2656         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2657         if (!sta || !sta->rate_ctrl_priv) {
2658                 if (sta)
2659                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2660                 else
2661                         IWL_DEBUG_RATE("leave - no station!\n");
2662                 rcu_read_unlock();
2663                 return sprintf(buf, "station %d not found\n", sta_id);
2664         }
2665
2666         lq_sta = (void *)sta->rate_ctrl_priv;
2667
2668         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2669         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2670
2671         if (is_legacy(lq_type))
2672                 i = IWL_RATE_54M_INDEX;
2673         else
2674                 i = IWL_RATE_60M_INDEX;
2675         while (1) {
2676                 u64 mask;
2677                 int j;
2678                 int active = lq_sta->active_tbl;
2679
2680                 cnt +=
2681                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2682
2683                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2684                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2685                         buf[cnt++] =
2686                                 (lq_sta->lq_info[active].win[i].data & mask)
2687                                 ? '1' : '0';
2688
2689                 samples += lq_sta->lq_info[active].win[i].counter;
2690                 good += lq_sta->lq_info[active].win[i].success_counter;
2691                 success += lq_sta->lq_info[active].win[i].success_counter *
2692                            iwl4965_rates[i].ieee;
2693
2694                 if (lq_sta->lq_info[active].win[i].stamp) {
2695                         int delta =
2696                                    jiffies_to_msecs(now -
2697                                    lq_sta->lq_info[active].win[i].stamp);
2698
2699                         if (delta > max_time)
2700                                 max_time = delta;
2701
2702                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2703                 } else
2704                         buf[cnt++] = '\n';
2705
2706                 j = iwl4965_get_prev_ieee_rate(i);
2707                 if (j == i)
2708                         break;
2709                 i = j;
2710         }
2711
2712         /* Display the average rate of all samples taken.
2713          *
2714          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2715          * added from iwl4965_rates is actually 2X the rate */
2716         if (samples)
2717                 cnt += sprintf(&buf[cnt],
2718                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2719                          "%3d%% success (%d good packets over %d tries)\n",
2720                          success / (2 * samples), (success * 5 / samples) % 10,
2721                          max_time, good * 100 / samples, good, samples);
2722         else
2723                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2724
2725         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2726                          "active_search %d rate index %d\n", lq_type, antenna,
2727                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2728
2729         rcu_read_unlock();
2730         return cnt;
2731 }
2732
2733 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2734 {
2735         struct iwl_priv *priv = hw->priv;
2736
2737         priv->lq_mngr.lq_ready = 1;
2738 }
2739
2740 int iwl4965_rate_control_register(void)
2741 {
2742         return ieee80211_rate_control_register(&rs_ops);
2743 }
2744
2745 void iwl4965_rate_control_unregister(void)
2746 {
2747         ieee80211_rate_control_unregister(&rs_ops);
2748 }
2749