SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-agn-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-dev.h"
  41 #include "iwl-sta.h"
  42 #include "iwl-core.h"
  43 #include "iwl-helpers.h"
  44
  45 #define RS_NAME "iwl-agn-rs"
  46
  47 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  48 #define IWL_NUMBER_TRY      1
  49 #define IWL_HT_NUMBER_TRY   3
  50
  51 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  52 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  53 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  54
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  63         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  64         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  65         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  66 };
  67
  68 static const u8 ant_toggle_lookup[] = {
  69         /*ANT_NONE -> */ ANT_NONE,
  70         /*ANT_A    -> */ ANT_B,
  71         /*ANT_B    -> */ ANT_C,
  72         /*ANT_AB   -> */ ANT_BC,
  73         /*ANT_C    -> */ ANT_A,
  74         /*ANT_AC   -> */ ANT_AB,
  75         /*ANT_BC   -> */ ANT_AC,
  76         /*ANT_ABC  -> */ ANT_ABC,
  77 };
  78
  79 /**
  80  * struct iwl_rate_scale_data -- tx success history for one rate
  81  */
  82 struct iwl_rate_scale_data {
  83         u64 data;               /* bitmap of successful frames */
  84         s32 success_counter;    /* number of frames successful */
  85         s32 success_ratio;      /* per-cent * 128  */
  86         s32 counter;            /* number of frames attempted */
  87         s32 average_tpt;        /* success ratio * expected throughput */
  88         unsigned long stamp;
  89 };
  90
  91 /**
  92  * struct iwl_scale_tbl_info -- tx params and success history for all rates
  93  *
  94  * There are two of these in struct iwl_lq_sta,
  95  * one for "active", and one for "search".
  96  */
  97 struct iwl_scale_tbl_info {
  98         enum iwl_table_type lq_type;
  99         u8 ant_type;
 100         u8 is_SGI;      /* 1 = short guard interval */
 101         u8 is_fat;      /* 1 = 40 MHz channel width */
 102         u8 is_dup;      /* 1 = duplicated data streams */
 103         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 104         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 105         u32 current_rate;  /* rate_n_flags, uCode API format */
 106         struct iwl_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 107 };
 108
 109 struct iwl_traffic_load {
 110         unsigned long time_stamp;       /* age of the oldest statistics */
 111         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 112                                                  * slice */
 113         u32 total;                      /* total num of packets during the
 114                                          * last TID_MAX_TIME_DIFF */
 115         u8 queue_count;                 /* number of queues that has
 116                                          * been used since the last cleanup */
 117         u8 head;                        /* start of the circular buffer */
 118 };
 119
 120 /**
 121  * struct iwl_lq_sta -- driver's rate scaling private structure
 122  *
 123  * Pointer to this gets passed back and forth between driver and mac80211.
 124  */
 125 struct iwl_lq_sta {
 126         u8 active_tbl;          /* index of active table, range 0-1 */
 127         u8 enable_counter;      /* indicates HT mode */
 128         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 129         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 130         s32 last_tpt;
 131
 132         /* The following determine when to search for a new mode */
 133         u32 table_count_limit;
 134         u32 max_failure_limit;  /* # failed frames before new search */
 135         u32 max_success_limit;  /* # successful frames before new search */
 136         u32 table_count;
 137         u32 total_failed;       /* total failed frames, any/all rates */
 138         u32 total_success;      /* total successful frames, any/all rates */
 139         u32 flush_timer;        /* time staying in mode before new search */
 140
 141         u8 action_counter;      /* # mode-switch actions tried */
 142         u8 is_green;
 143         u8 is_dup;
 144         enum ieee80211_band band;
 145         u8 ibss_sta_added;
 146
 147         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 148         u32 supp_rates;
 149         u16 active_legacy_rate;
 150         u16 active_siso_rate;
 151         u16 active_mimo2_rate;
 152         u16 active_mimo3_rate;
 153         u16 active_rate_basic;
 154
 155         struct iwl_link_quality_cmd lq;
 156         struct iwl_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 157         struct iwl_traffic_load load[TID_MAX_LOAD_COUNT];
 158         u8 tx_agg_tid_en;
 159 #ifdef CONFIG_MAC80211_DEBUGFS
 160         struct dentry *rs_sta_dbgfs_scale_table_file;
 161         struct dentry *rs_sta_dbgfs_stats_table_file;
 162         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 163         u32 dbg_fixed_rate;
 164 #endif
 165         struct iwl_priv *drv;
 166
 167         /* used to be in sta_info */
 168         int last_txrate_idx;
 169 };
 170
 171 static void rs_rate_scale_perform(struct iwl_priv *priv,
 172                                    struct net_device *dev,
 173                                    struct ieee80211_hdr *hdr,
 174                                    struct sta_info *sta);
 175 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 176                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 177
 178
 179 #ifdef CONFIG_MAC80211_DEBUGFS
 180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 181                              u32 *rate_n_flags, int index);
 182 #else
 183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 184                              u32 *rate_n_flags, int index)
 185 {}
 186 #endif
 187
 188 /*
 189  * Expected throughput metrics for following rates:
 190  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 191  * "G" is the only table that supports CCK (the first 4 rates).
 192  */
 193 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 194 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 195         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 196 };
 197
 198 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 199         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 200 };
 201
 202 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 203         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 204 };
 205
 206 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 207         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 208 };
 209
 210 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 211         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 212 };
 213
 214 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 215         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 216 };
 217
 218 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 219         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 220 };
 221
 222 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 223         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 224 };
 225
 226 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 227         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 228 };
 229
 230 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 231         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 232 };
 233
 234 static inline u8 rs_extract_rate(u32 rate_n_flags)
 235 {
 236         return (u8)(rate_n_flags & 0xFF);
 237 }
 238
 239 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 240 {
 241         window->data = 0;
 242         window->success_counter = 0;
 243         window->success_ratio = IWL_INVALID_VALUE;
 244         window->counter = 0;
 245         window->average_tpt = IWL_INVALID_VALUE;
 246         window->stamp = 0;
 247 }
 248
 249 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 250 {
 251         return (ant_type & valid_antenna) == ant_type;
 252 }
 253
 254 /*
 255  *      removes the old data from the statistics. All data that is older than
 256  *      TID_MAX_TIME_DIFF, will be deleted.
 257  */
 258 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 259 {
 260         /* The oldest age we want to keep */
 261         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 262
 263         while (tl->queue_count &&
 264                (tl->time_stamp < oldest_time)) {
 265                 tl->total -= tl->packet_count[tl->head];
 266                 tl->packet_count[tl->head] = 0;
 267                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 268                 tl->queue_count--;
 269                 tl->head++;
 270                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 271                         tl->head = 0;
 272         }
 273 }
 274
 275 /*
 276  *      increment traffic load value for tid and also remove
 277  *      any old values if passed the certain time period
 278  */
 279 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 280                            struct ieee80211_hdr *hdr)
 281 {
 282         u32 curr_time = jiffies_to_msecs(jiffies);
 283         u32 time_diff;
 284         s32 index;
 285         struct iwl_traffic_load *tl = NULL;
 286         __le16 fc = hdr->frame_control;
 287         u8 tid;
 288
 289         if (ieee80211_is_data_qos(fc)) {
 290                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 291                 tid = qc[0] & 0xf;
 292         } else
 293                 return MAX_TID_COUNT;
 294
 295         tl = &lq_data->load[tid];
 296
 297         curr_time -= curr_time % TID_ROUND_VALUE;
 298
 299         /* Happens only for the first packet. Initialize the data */
 300         if (!(tl->queue_count)) {
 301                 tl->total = 1;
 302                 tl->time_stamp = curr_time;
 303                 tl->queue_count = 1;
 304                 tl->head = 0;
 305                 tl->packet_count[0] = 1;
 306                 return MAX_TID_COUNT;
 307         }
 308
 309         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 310         index = time_diff / TID_QUEUE_CELL_SPACING;
 311
 312         /* The history is too long: remove data that is older than */
 313         /* TID_MAX_TIME_DIFF */
 314         if (index >= TID_QUEUE_MAX_SIZE)
 315                 rs_tl_rm_old_stats(tl, curr_time);
 316
 317         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 318         tl->packet_count[index] = tl->packet_count[index] + 1;
 319         tl->total = tl->total + 1;
 320
 321         if ((index + 1) > tl->queue_count)
 322                 tl->queue_count = index + 1;
 323
 324         return tid;
 325 }
 326
 327 /*
 328         get the traffic load value for tid
 329 */
 330 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 331 {
 332         u32 curr_time = jiffies_to_msecs(jiffies);
 333         u32 time_diff;
 334         s32 index;
 335         struct iwl_traffic_load *tl = NULL;
 336
 337         if (tid >= TID_MAX_LOAD_COUNT)
 338                 return 0;
 339
 340         tl = &(lq_data->load[tid]);
 341
 342         curr_time -= curr_time % TID_ROUND_VALUE;
 343
 344         if (!(tl->queue_count))
 345                 return 0;
 346
 347         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 348         index = time_diff / TID_QUEUE_CELL_SPACING;
 349
 350         /* The history is too long: remove data that is older than */
 351         /* TID_MAX_TIME_DIFF */
 352         if (index >= TID_QUEUE_MAX_SIZE)
 353                 rs_tl_rm_old_stats(tl, curr_time);
 354
 355         return tl->total;
 356 }
 357
 358 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 359                                       struct iwl_lq_sta *lq_data, u8 tid,
 360                                       struct sta_info *sta)
 361 {
 362         unsigned long state;
 363         DECLARE_MAC_BUF(mac);
 364
 365         spin_lock_bh(&sta->lock);
 366         state = sta->ampdu_mlme.tid_state_tx[tid];
 367         spin_unlock_bh(&sta->lock);
 368
 369         if (state == HT_AGG_STATE_IDLE &&
 370             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 371                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 372                                 print_mac(mac, sta->sta.addr), tid);
 373                 ieee80211_start_tx_ba_session(priv->hw, sta->sta.addr, tid);
 374         }
 375 }
 376
 377 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 378                               struct iwl_lq_sta *lq_data,
 379                               struct sta_info *sta)
 380 {
 381         if ((tid < TID_MAX_LOAD_COUNT))
 382                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 383         else if (tid == IWL_AGG_ALL_TID)
 384                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 385                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 386 }
 387
 388 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 389 {
 390         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 391                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 392                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 393 }
 394
 395 /**
 396  * rs_collect_tx_data - Update the success/failure sliding window
 397  *
 398  * We keep a sliding window of the last 62 packets transmitted
 399  * at this rate.  window->data contains the bitmask of successful
 400  * packets.
 401  */
 402 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 403                               int scale_index, s32 tpt, int retries,
 404                               int successes)
 405 {
 406         struct iwl_rate_scale_data *window = NULL;
 407         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 408         s32 fail_count;
 409
 410         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 411                 return -EINVAL;
 412
 413         /* Select data for current tx bit rate */
 414         window = &(windows[scale_index]);
 415
 416         /*
 417          * Keep track of only the latest 62 tx frame attempts in this rate's
 418          * history window; anything older isn't really relevant any more.
 419          * If we have filled up the sliding window, drop the oldest attempt;
 420          * if the oldest attempt (highest bit in bitmap) shows "success",
 421          * subtract "1" from the success counter (this is the main reason
 422          * we keep these bitmaps!).
 423          */
 424         while (retries > 0) {
 425                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 426
 427                         /* remove earliest */
 428                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 429
 430                         if (window->data & mask) {
 431                                 window->data &= ~mask;
 432                                 window->success_counter--;
 433                         }
 434                 }
 435
 436                 /* Increment frames-attempted counter */
 437                 window->counter++;
 438
 439                 /* Shift bitmap by one frame (throw away oldest history),
 440                  * OR in "1", and increment "success" if this
 441                  * frame was successful. */
 442                 window->data <<= 1;
 443                 if (successes > 0) {
 444                         window->success_counter++;
 445                         window->data |= 0x1;
 446                         successes--;
 447                 }
 448
 449                 retries--;
 450         }
 451
 452         /* Calculate current success ratio, avoid divide-by-0! */
 453         if (window->counter > 0)
 454                 window->success_ratio = 128 * (100 * window->success_counter)
 455                                         / window->counter;
 456         else
 457                 window->success_ratio = IWL_INVALID_VALUE;
 458
 459         fail_count = window->counter - window->success_counter;
 460
 461         /* Calculate average throughput, if we have enough history. */
 462         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 463             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 464                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 465         else
 466                 window->average_tpt = IWL_INVALID_VALUE;
 467
 468         /* Tag this window as having been updated */
 469         window->stamp = jiffies;
 470
 471         return 0;
 472 }
 473
 474 /*
 475  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 476  */
 477 /* FIXME:RS:remove this function and put the flags statically in the table */
 478 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
 479                                        int index, u8 use_green)
 480 {
 481         u32 rate_n_flags = 0;
 482
 483         if (is_legacy(tbl->lq_type)) {
 484                 rate_n_flags = iwl_rates[index].plcp;
 485                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 486                         rate_n_flags |= RATE_MCS_CCK_MSK;
 487
 488         } else if (is_Ht(tbl->lq_type)) {
 489                 if (index > IWL_LAST_OFDM_RATE) {
 490                         IWL_ERROR("invalid HT rate index %d\n", index);
 491                         index = IWL_LAST_OFDM_RATE;
 492                 }
 493                 rate_n_flags = RATE_MCS_HT_MSK;
 494
 495                 if (is_siso(tbl->lq_type))
 496                         rate_n_flags |= iwl_rates[index].plcp_siso;
 497                 else if (is_mimo2(tbl->lq_type))
 498                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 499                 else
 500                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 501         } else {
 502                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 503         }
 504
 505         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 506                                                      RATE_MCS_ANT_ABC_MSK);
 507
 508         if (is_Ht(tbl->lq_type)) {
 509                 if (tbl->is_fat) {
 510                         if (tbl->is_dup)
 511                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 512                         else
 513                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 514                 }
 515                 if (tbl->is_SGI)
 516                         rate_n_flags |= RATE_MCS_SGI_MSK;
 517
 518                 if (use_green) {
 519                         rate_n_flags |= RATE_MCS_GF_MSK;
 520                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 521                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 522                                 IWL_ERROR("GF was set with SGI:SISO\n");
 523                         }
 524                 }
 525         }
 526         return rate_n_flags;
 527 }
 528
 529 /*
 530  * Interpret uCode API's rate_n_flags format,
 531  * fill "search" or "active" tx mode table.
 532  */
 533 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 534                                     enum ieee80211_band band,
 535                                     struct iwl_scale_tbl_info *tbl,
 536                                     int *rate_idx)
 537 {
 538         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 539         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 540         u8 mcs;
 541
 542         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 543
 544         if (*rate_idx  == IWL_RATE_INVALID) {
 545                 *rate_idx = -1;
 546                 return -EINVAL;
 547         }
 548         tbl->is_SGI = 0;        /* default legacy setup */
 549         tbl->is_fat = 0;
 550         tbl->is_dup = 0;
 551         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 552         tbl->lq_type = LQ_NONE;
 553
 554         /* legacy rate format */
 555         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 556                 if (num_of_ant == 1) {
 557                         if (band == IEEE80211_BAND_5GHZ)
 558                                 tbl->lq_type = LQ_A;
 559                         else
 560                                 tbl->lq_type = LQ_G;
 561                 }
 562         /* HT rate format */
 563         } else {
 564                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 565                         tbl->is_SGI = 1;
 566
 567                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 568                     (rate_n_flags & RATE_MCS_DUP_MSK))
 569                         tbl->is_fat = 1;
 570
 571                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 572                         tbl->is_dup = 1;
 573
 574                 mcs = rs_extract_rate(rate_n_flags);
 575
 576                 /* SISO */
 577                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 578                         if (num_of_ant == 1)
 579                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 580                 /* MIMO2 */
 581                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 582                         if (num_of_ant == 2)
 583                                 tbl->lq_type = LQ_MIMO2;
 584                 /* MIMO3 */
 585                 } else {
 586                         if (num_of_ant == 3)
 587                                 tbl->lq_type = LQ_MIMO3;
 588                 }
 589         }
 590         return 0;
 591 }
 592
 593 /* switch to another antenna/antennas and return 1 */
 594 /* if no other valid antenna found, return 0 */
 595 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 596                              struct iwl_scale_tbl_info *tbl)
 597 {
 598         u8 new_ant_type;
 599
 600         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 601                 return 0;
 602
 603         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 604                 return 0;
 605
 606         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 607
 608         while ((new_ant_type != tbl->ant_type) &&
 609                !rs_is_valid_ant(valid_ant, new_ant_type))
 610                 new_ant_type = ant_toggle_lookup[new_ant_type];
 611
 612         if (new_ant_type == tbl->ant_type)
 613                 return 0;
 614
 615         tbl->ant_type = new_ant_type;
 616         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 617         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 618         return 1;
 619 }
 620
 621 /* FIXME:RS: in 4965 we don't use greenfield at all */
 622 /* FIXME:RS: don't use greenfield for now in TX */
 623 #if 0
 624 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 625 {
 626         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 627                 priv->current_ht_config.is_green_field &&
 628                 !priv->current_ht_config.non_GF_STA_present;
 629 }
 630 #endif
 631 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 632 {
 633         return 0;
 634 }
 635
 636 /**
 637  * rs_get_supported_rates - get the available rates
 638  *
 639  * if management frame or broadcast frame only return
 640  * basic available rates.
 641  *
 642  */
 643 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 644                                   struct ieee80211_hdr *hdr,
 645                                   enum iwl_table_type rate_type)
 646 {
 647         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 648             lq_sta->active_rate_basic)
 649                 return lq_sta->active_rate_basic;
 650
 651         if (is_legacy(rate_type)) {
 652                 return lq_sta->active_legacy_rate;
 653         } else {
 654                 if (is_siso(rate_type))
 655                         return lq_sta->active_siso_rate;
 656                 else if (is_mimo2(rate_type))
 657                         return lq_sta->active_mimo2_rate;
 658                 else
 659                         return lq_sta->active_mimo3_rate;
 660         }
 661 }
 662
 663 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 664                                 int rate_type)
 665 {
 666         u8 high = IWL_RATE_INVALID;
 667         u8 low = IWL_RATE_INVALID;
 668
 669         /* 802.11A or ht walks to the next literal adjacent rate in
 670          * the rate table */
 671         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 672                 int i;
 673                 u32 mask;
 674
 675                 /* Find the previous rate that is in the rate mask */
 676                 i = index - 1;
 677                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 678                         if (rate_mask & mask) {
 679                                 low = i;
 680                                 break;
 681                         }
 682                 }
 683
 684                 /* Find the next rate that is in the rate mask */
 685                 i = index + 1;
 686                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 687                         if (rate_mask & mask) {
 688                                 high = i;
 689                                 break;
 690                         }
 691                 }
 692
 693                 return (high << 8) | low;
 694         }
 695
 696         low = index;
 697         while (low != IWL_RATE_INVALID) {
 698                 low = iwl_rates[low].prev_rs;
 699                 if (low == IWL_RATE_INVALID)
 700                         break;
 701                 if (rate_mask & (1 << low))
 702                         break;
 703                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 704         }
 705
 706         high = index;
 707         while (high != IWL_RATE_INVALID) {
 708                 high = iwl_rates[high].next_rs;
 709                 if (high == IWL_RATE_INVALID)
 710                         break;
 711                 if (rate_mask & (1 << high))
 712                         break;
 713                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 714         }
 715
 716         return (high << 8) | low;
 717 }
 718
 719 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 720                              struct iwl_scale_tbl_info *tbl,
 721                              u8 scale_index, u8 ht_possible)
 722 {
 723         s32 low;
 724         u16 rate_mask;
 725         u16 high_low;
 726         u8 switch_to_legacy = 0;
 727         u8 is_green = lq_sta->is_green;
 728
 729         /* check if we need to switch from HT to legacy rates.
 730          * assumption is that mandatory rates (1Mbps or 6Mbps)
 731          * are always supported (spec demand) */
 732         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 733                 switch_to_legacy = 1;
 734                 scale_index = rs_ht_to_legacy[scale_index];
 735                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 736                         tbl->lq_type = LQ_A;
 737                 else
 738                         tbl->lq_type = LQ_G;
 739
 740                 if (num_of_ant(tbl->ant_type) > 1)
 741                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 742
 743                 tbl->is_fat = 0;
 744                 tbl->is_SGI = 0;
 745         }
 746
 747         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 748
 749         /* Mask with station rate restriction */
 750         if (is_legacy(tbl->lq_type)) {
 751                 /* supp_rates has no CCK bits in A mode */
 752                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 753                         rate_mask  = (u16)(rate_mask &
 754                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 755                 else
 756                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 757         }
 758
 759         /* If we switched from HT to legacy, check current rate */
 760         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 761                 low = scale_index;
 762                 goto out;
 763         }
 764
 765         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 766                                         tbl->lq_type);
 767         low = high_low & 0xff;
 768
 769         if (low == IWL_RATE_INVALID)
 770                 low = scale_index;
 771
 772 out:
 773         return rate_n_flags_from_tbl(tbl, low, is_green);
 774 }
 775
 776 /*
 777  * mac80211 sends us Tx status
 778  */
 779 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 780                          struct sk_buff *skb)
 781 {
 782         int status;
 783         u8 retries;
 784         int rs_index, index = 0;
 785         struct iwl_lq_sta *lq_sta;
 786         struct iwl_link_quality_cmd *table;
 787         struct sta_info *sta;
 788         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 789         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 790         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 791         struct ieee80211_hw *hw = local_to_hw(local);
 792         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 793         struct iwl_rate_scale_data *window = NULL;
 794         struct iwl_rate_scale_data *search_win = NULL;
 795         u32 tx_rate;
 796         struct iwl_scale_tbl_info tbl_type;
 797         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 798         u8 active_index = 0;
 799         __le16 fc = hdr->frame_control;
 800         s32 tpt = 0;
 801
 802         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 803
 804         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 805                 return;
 806
 807         /* This packet was aggregated but doesn't carry rate scale info */
 808         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 809             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 810                 return;
 811
 812         retries = info->status.retry_count;
 813
 814         if (retries > 15)
 815                 retries = 15;
 816
 817         rcu_read_lock();
 818
 819         sta = sta_info_get(local, hdr->addr1);
 820
 821         if (!sta || !sta->rate_ctrl_priv)
 822                 goto out;
 823
 824
 825         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
 826
 827         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
 828             !lq_sta->ibss_sta_added)
 829                 goto out;
 830
 831         table = &lq_sta->lq;
 832         active_index = lq_sta->active_tbl;
 833
 834         curr_tbl = &(lq_sta->lq_info[active_index]);
 835         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 836         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 837         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 838
 839         /*
 840          * Ignore this Tx frame response if its initial rate doesn't match
 841          * that of latest Link Quality command.  There may be stragglers
 842          * from a previous Link Quality command, but we're no longer interested
 843          * in those; they're either from the "active" mode while we're trying
 844          * to check "search" mode, or a prior "search" mode after we've moved
 845          * to a new "search" mode (which might become the new "active" mode).
 846          */
 847         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 848         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 849         if (priv->band == IEEE80211_BAND_5GHZ)
 850                 rs_index -= IWL_FIRST_OFDM_RATE;
 851
 852         if ((info->tx_rate_idx < 0) ||
 853             (tbl_type.is_SGI ^
 854                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 855             (tbl_type.is_fat ^
 856                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 857             (tbl_type.is_dup ^
 858                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 859             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 860             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 861                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 862             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 863                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 864             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 865              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 866                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 867                 goto out;
 868         }
 869
 870         /* Update frame history window with "failure" for each Tx retry. */
 871         while (retries) {
 872                 /* Look up the rate and other info used for each tx attempt.
 873                  * Each tx attempt steps one entry deeper in the rate table. */
 874                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 875                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 876                                           &tbl_type, &rs_index);
 877
 878                 /* If type matches "search" table,
 879                  * add failure to "search" history */
 880                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 881                     (tbl_type.ant_type == search_tbl->ant_type) &&
 882                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 883                         if (search_tbl->expected_tpt)
 884                                 tpt = search_tbl->expected_tpt[rs_index];
 885                         else
 886                                 tpt = 0;
 887                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 888
 889                 /* Else if type matches "current/active" table,
 890                  * add failure to "current/active" history */
 891                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 892                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 893                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 894                         if (curr_tbl->expected_tpt)
 895                                 tpt = curr_tbl->expected_tpt[rs_index];
 896                         else
 897                                 tpt = 0;
 898                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 899                 }
 900
 901                 /* If not searching for a new mode, increment failed counter
 902                  * ... this helps determine when to start searching again */
 903                 if (lq_sta->stay_in_tbl)
 904                         lq_sta->total_failed++;
 905                 --retries;
 906                 index++;
 907
 908         }
 909
 910         /*
 911          * Find (by rate) the history window to update with final Tx attempt;
 912          * if Tx was successful first try, use original rate,
 913          * else look up the rate that was, finally, successful.
 914          */
 915         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 916         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 917
 918         /* Update frame history window with "success" if Tx got ACKed ... */
 919         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 920
 921         /* If type matches "search" table,
 922          * add final tx status to "search" history */
 923         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 924             (tbl_type.ant_type == search_tbl->ant_type) &&
 925             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 926                 if (search_tbl->expected_tpt)
 927                         tpt = search_tbl->expected_tpt[rs_index];
 928                 else
 929                         tpt = 0;
 930                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 931                         rs_collect_tx_data(search_win, rs_index, tpt,
 932                                            info->status.ampdu_ack_len,
 933                                            info->status.ampdu_ack_map);
 934                 else
 935                         rs_collect_tx_data(search_win, rs_index, tpt,
 936                                            1, status);
 937         /* Else if type matches "current/active" table,
 938          * add final tx status to "current/active" history */
 939         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 940                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 941                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 942                 if (curr_tbl->expected_tpt)
 943                         tpt = curr_tbl->expected_tpt[rs_index];
 944                 else
 945                         tpt = 0;
 946                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 947                         rs_collect_tx_data(window, rs_index, tpt,
 948                                            info->status.ampdu_ack_len,
 949                                            info->status.ampdu_ack_map);
 950                 else
 951                         rs_collect_tx_data(window, rs_index, tpt,
 952                                            1, status);
 953         }
 954
 955         /* If not searching for new mode, increment success/failed counter
 956          * ... these help determine when to start searching again */
 957         if (lq_sta->stay_in_tbl) {
 958                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 959                         lq_sta->total_success += info->status.ampdu_ack_map;
 960                         lq_sta->total_failed +=
 961                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 962                 } else {
 963                         if (status)
 964                                 lq_sta->total_success++;
 965                         else
 966                                 lq_sta->total_failed++;
 967                 }
 968         }
 969
 970         /* See if there's a better rate or modulation mode to try. */
 971         rs_rate_scale_perform(priv, dev, hdr, sta);
 972 out:
 973         rcu_read_unlock();
 974         return;
 975 }
 976
 977 /*
 978  * Begin a period of staying with a selected modulation mode.
 979  * Set "stay_in_tbl" flag to prevent any mode switches.
 980  * Set frame tx success limits according to legacy vs. high-throughput,
 981  * and reset overall (spanning all rates) tx success history statistics.
 982  * These control how long we stay using same modulation mode before
 983  * searching for a new mode.
 984  */
 985 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 986                                  struct iwl_lq_sta *lq_sta)
 987 {
 988         IWL_DEBUG_RATE("we are staying in the same table\n");
 989         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 990         if (is_legacy) {
 991                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 992                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 993                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 994         } else {
 995                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 996                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 997                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 998         }
 999         lq_sta->table_count = 0;
1000         lq_sta->total_failed = 0;
1001         lq_sta->total_success = 0;
1002 }
1003
1004 /*
1005  * Find correct throughput table for given mode of modulation
1006  */
1007 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1008                                       struct iwl_scale_tbl_info *tbl)
1009 {
1010         if (is_legacy(tbl->lq_type)) {
1011                 if (!is_a_band(tbl->lq_type))
1012                         tbl->expected_tpt = expected_tpt_G;
1013                 else
1014                         tbl->expected_tpt = expected_tpt_A;
1015         } else if (is_siso(tbl->lq_type)) {
1016                 if (tbl->is_fat && !lq_sta->is_dup)
1017                         if (tbl->is_SGI)
1018                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1019                         else
1020                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1021                 else if (tbl->is_SGI)
1022                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1023                 else
1024                         tbl->expected_tpt = expected_tpt_siso20MHz;
1025
1026         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1027                 if (tbl->is_fat && !lq_sta->is_dup)
1028                         if (tbl->is_SGI)
1029                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1030                         else
1031                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1032                 else if (tbl->is_SGI)
1033                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1034                 else
1035                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1036         } else
1037                 tbl->expected_tpt = expected_tpt_G;
1038 }
1039
1040 /*
1041  * Find starting rate for new "search" high-throughput mode of modulation.
1042  * Goal is to find lowest expected rate (under perfect conditions) that is
1043  * above the current measured throughput of "active" mode, to give new mode
1044  * a fair chance to prove itself without too many challenges.
1045  *
1046  * This gets called when transitioning to more aggressive modulation
1047  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1048  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1049  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1050  * bit rate will typically need to increase, but not if performance was bad.
1051  */
1052 static s32 rs_get_best_rate(struct iwl_priv *priv,
1053                             struct iwl_lq_sta *lq_sta,
1054                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1055                             u16 rate_mask, s8 index)
1056 {
1057         /* "active" values */
1058         struct iwl_scale_tbl_info *active_tbl =
1059             &(lq_sta->lq_info[lq_sta->active_tbl]);
1060         s32 active_sr = active_tbl->win[index].success_ratio;
1061         s32 active_tpt = active_tbl->expected_tpt[index];
1062
1063         /* expected "search" throughput */
1064         s32 *tpt_tbl = tbl->expected_tpt;
1065
1066         s32 new_rate, high, low, start_hi;
1067         u16 high_low;
1068         s8 rate = index;
1069
1070         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1071
1072         for (; ;) {
1073                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1074                                                 tbl->lq_type);
1075
1076                 low = high_low & 0xff;
1077                 high = (high_low >> 8) & 0xff;
1078
1079                 /*
1080                  * Lower the "search" bit rate, to give new "search" mode
1081                  * approximately the same throughput as "active" if:
1082                  *
1083                  * 1) "Active" mode has been working modestly well (but not
1084                  *    great), and expected "search" throughput (under perfect
1085                  *    conditions) at candidate rate is above the actual
1086                  *    measured "active" throughput (but less than expected
1087                  *    "active" throughput under perfect conditions).
1088                  * OR
1089                  * 2) "Active" mode has been working perfectly or very well
1090                  *    and expected "search" throughput (under perfect
1091                  *    conditions) at candidate rate is above expected
1092                  *    "active" throughput (under perfect conditions).
1093                  */
1094                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1095                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1096                       (active_sr <= IWL_RATE_HIGH_TH) &&
1097                       (tpt_tbl[rate] <= active_tpt))) ||
1098                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1099                      (tpt_tbl[rate] > active_tpt))) {
1100
1101                         /* (2nd or later pass)
1102                          * If we've already tried to raise the rate, and are
1103                          * now trying to lower it, use the higher rate. */
1104                         if (start_hi != IWL_RATE_INVALID) {
1105                                 new_rate = start_hi;
1106                                 break;
1107                         }
1108
1109                         new_rate = rate;
1110
1111                         /* Loop again with lower rate */
1112                         if (low != IWL_RATE_INVALID)
1113                                 rate = low;
1114
1115                         /* Lower rate not available, use the original */
1116                         else
1117                                 break;
1118
1119                 /* Else try to raise the "search" rate to match "active" */
1120                 } else {
1121                         /* (2nd or later pass)
1122                          * If we've already tried to lower the rate, and are
1123                          * now trying to raise it, use the lower rate. */
1124                         if (new_rate != IWL_RATE_INVALID)
1125                                 break;
1126
1127                         /* Loop again with higher rate */
1128                         else if (high != IWL_RATE_INVALID) {
1129                                 start_hi = high;
1130                                 rate = high;
1131
1132                         /* Higher rate not available, use the original */
1133                         } else {
1134                                 new_rate = rate;
1135                                 break;
1136                         }
1137                 }
1138         }
1139
1140         return new_rate;
1141 }
1142
1143 /*
1144  * Set up search table for MIMO
1145  */
1146 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1147                              struct iwl_lq_sta *lq_sta,
1148                              struct ieee80211_conf *conf,
1149                              struct sta_info *sta,
1150                              struct iwl_scale_tbl_info *tbl, int index)
1151 {
1152         u16 rate_mask;
1153         s32 rate;
1154         s8 is_green = lq_sta->is_green;
1155
1156         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1157             !sta->ht_info.ht_supported)
1158                 return -1;
1159
1160         if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1161                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1162                 return -1;
1163
1164         /* Need both Tx chains/antennas to support MIMO */
1165         if (priv->hw_params.tx_chains_num < 2)
1166                 return -1;
1167
1168         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1169
1170         tbl->lq_type = LQ_MIMO2;
1171         tbl->is_dup = lq_sta->is_dup;
1172         tbl->action = 0;
1173         rate_mask = lq_sta->active_mimo2_rate;
1174
1175         if (priv->current_ht_config.supported_chan_width
1176                                         == IWL_CHANNEL_WIDTH_40MHZ)
1177                 tbl->is_fat = 1;
1178         else
1179                 tbl->is_fat = 0;
1180
1181         /* FIXME: - don't toggle SGI here
1182         if (tbl->is_fat) {
1183                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1184                         tbl->is_SGI = 1;
1185                 else
1186                         tbl->is_SGI = 0;
1187         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1188                 tbl->is_SGI = 1;
1189         else
1190                 tbl->is_SGI = 0;
1191         */
1192
1193         rs_set_expected_tpt_table(lq_sta, tbl);
1194
1195         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196
1197         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1198
1199         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1201                                                 rate, rate_mask);
1202                 return -1;
1203         }
1204         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1205
1206         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1207                      tbl->current_rate, is_green);
1208         return 0;
1209 }
1210
1211 /*
1212  * Set up search table for SISO
1213  */
1214 static int rs_switch_to_siso(struct iwl_priv *priv,
1215                              struct iwl_lq_sta *lq_sta,
1216                              struct ieee80211_conf *conf,
1217                              struct sta_info *sta,
1218                              struct iwl_scale_tbl_info *tbl, int index)
1219 {
1220         u16 rate_mask;
1221         u8 is_green = lq_sta->is_green;
1222         s32 rate;
1223
1224         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1225             !sta->ht_info.ht_supported)
1226                 return -1;
1227
1228         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1229
1230         tbl->is_dup = lq_sta->is_dup;
1231         tbl->lq_type = LQ_SISO;
1232         tbl->action = 0;
1233         rate_mask = lq_sta->active_siso_rate;
1234
1235         if (priv->current_ht_config.supported_chan_width
1236             == IWL_CHANNEL_WIDTH_40MHZ)
1237                 tbl->is_fat = 1;
1238         else
1239                 tbl->is_fat = 0;
1240
1241         /* FIXME: - don't toggle SGI here
1242         if (tbl->is_fat) {
1243                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1244                         tbl->is_SGI = 1;
1245                 else
1246                         tbl->is_SGI = 0;
1247         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1248                 tbl->is_SGI = 1;
1249         else
1250                 tbl->is_SGI = 0;
1251         */
1252
1253         if (is_green)
1254                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1255
1256         rs_set_expected_tpt_table(lq_sta, tbl);
1257         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1258
1259         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1261                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1262                              rate, rate_mask);
1263                 return -1;
1264         }
1265         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1266         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1267                      tbl->current_rate, is_green);
1268         return 0;
1269 }
1270
1271 /*
1272  * Try to switch to new modulation mode from legacy
1273  */
1274 static int rs_move_legacy_other(struct iwl_priv *priv,
1275                                 struct iwl_lq_sta *lq_sta,
1276                                 struct ieee80211_conf *conf,
1277                                 struct sta_info *sta,
1278                                 int index)
1279 {
1280         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1281         struct iwl_scale_tbl_info *search_tbl =
1282                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1283         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1284         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1285                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1286         u8 start_action = tbl->action;
1287         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1288         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1289         int ret = 0;
1290
1291         for (; ;) {
1292                 switch (tbl->action) {
1293                 case IWL_LEGACY_SWITCH_ANTENNA1:
1294                 case IWL_LEGACY_SWITCH_ANTENNA2:
1295                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1296
1297                         lq_sta->action_counter++;
1298
1299                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1300                                                         tx_chains_num <= 1) ||
1301                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1302                                                         tx_chains_num <= 2))
1303                                 break;
1304
1305                         /* Don't change antenna if success has been great */
1306                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1307                                 break;
1308
1309                         /* Set up search table to try other antenna */
1310                         memcpy(search_tbl, tbl, sz);
1311
1312                         if (rs_toggle_antenna(valid_tx_ant,
1313                                 &search_tbl->current_rate, search_tbl)) {
1314                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1315                                 goto out;
1316                         }
1317                         break;
1318                 case IWL_LEGACY_SWITCH_SISO:
1319                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1320
1321                         /* Set up search table to try SISO */
1322                         memcpy(search_tbl, tbl, sz);
1323                         search_tbl->is_SGI = 0;
1324                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1325                                                  search_tbl, index);
1326                         if (!ret) {
1327                                 lq_sta->action_counter = 0;
1328                                 goto out;
1329                         }
1330
1331                         break;
1332                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1333                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1334                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1335                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1336
1337                         /* Set up search table to try MIMO */
1338                         memcpy(search_tbl, tbl, sz);
1339                         search_tbl->is_SGI = 0;
1340
1341                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1342                                 search_tbl->ant_type = ANT_AB;
1343                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1344                                 search_tbl->ant_type = ANT_AC;
1345                         else
1346                                 search_tbl->ant_type = ANT_BC;
1347
1348                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1349                                 break;
1350
1351                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1352                                                  search_tbl, index);
1353                         if (!ret) {
1354                                 lq_sta->action_counter = 0;
1355                                 goto out;
1356                         }
1357                         break;
1358                 }
1359                 tbl->action++;
1360                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1361                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1362
1363                 if (tbl->action == start_action)
1364                         break;
1365
1366         }
1367         search_tbl->lq_type = LQ_NONE;
1368         return 0;
1369
1370 out:
1371         lq_sta->search_better_tbl = 1;
1372         tbl->action++;
1373         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2_BC)
1374                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
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 iwl_lq_sta *lq_sta,
1384                                  struct ieee80211_conf *conf,
1385                                  struct sta_info *sta, int index)
1386 {
1387         u8 is_green = lq_sta->is_green;
1388         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1389         struct iwl_scale_tbl_info *search_tbl =
1390                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1391         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1392         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1393                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1394         u8 start_action = tbl->action;
1395         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1396         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1397         int ret;
1398
1399         for (;;) {
1400                 lq_sta->action_counter++;
1401                 switch (tbl->action) {
1402                 case IWL_SISO_SWITCH_ANTENNA1:
1403                 case IWL_SISO_SWITCH_ANTENNA2:
1404                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1405
1406                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1407                                                         tx_chains_num <= 1) ||
1408                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1409                                                         tx_chains_num <= 2))
1410                                 break;
1411
1412                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1413                                 break;
1414
1415                         memcpy(search_tbl, tbl, sz);
1416                         if (rs_toggle_antenna(valid_tx_ant,
1417                                        &search_tbl->current_rate, search_tbl))
1418                                 goto out;
1419                         break;
1420                 case IWL_SISO_SWITCH_MIMO2_AB:
1421                 case IWL_SISO_SWITCH_MIMO2_AC:
1422                 case IWL_SISO_SWITCH_MIMO2_BC:
1423                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1424                         memcpy(search_tbl, tbl, sz);
1425                         search_tbl->is_SGI = 0;
1426
1427                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1428                                 search_tbl->ant_type = ANT_AB;
1429                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1430                                 search_tbl->ant_type = ANT_AC;
1431                         else
1432                                 search_tbl->ant_type = ANT_BC;
1433
1434                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1435                                 break;
1436
1437                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1438                                                  search_tbl, index);
1439                         if (!ret)
1440                                 goto out;
1441                         break;
1442                 case IWL_SISO_SWITCH_GI:
1443                         if (!tbl->is_fat &&
1444                                 !(priv->current_ht_config.sgf &
1445                                                 HT_SHORT_GI_20MHZ))
1446                                 break;
1447                         if (tbl->is_fat &&
1448                                 !(priv->current_ht_config.sgf &
1449                                                 HT_SHORT_GI_40MHZ))
1450                                 break;
1451
1452                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1453
1454                         memcpy(search_tbl, tbl, sz);
1455                         if (is_green) {
1456                                 if (!tbl->is_SGI)
1457                                         break;
1458                                 else
1459                                         IWL_ERROR("SGI was set in GF+SISO\n");
1460                         }
1461                         search_tbl->is_SGI = !tbl->is_SGI;
1462                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1463                         if (tbl->is_SGI) {
1464                                 s32 tpt = lq_sta->last_tpt / 100;
1465                                 if (tpt >= search_tbl->expected_tpt[index])
1466                                         break;
1467                         }
1468                         search_tbl->current_rate = rate_n_flags_from_tbl(
1469                                                 search_tbl, index, is_green);
1470                         goto out;
1471                 }
1472                 tbl->action++;
1473                 if (tbl->action > IWL_SISO_SWITCH_GI)
1474                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1475
1476                 if (tbl->action == start_action)
1477                         break;
1478         }
1479         search_tbl->lq_type = LQ_NONE;
1480         return 0;
1481
1482  out:
1483         lq_sta->search_better_tbl = 1;
1484         tbl->action++;
1485         if (tbl->action > IWL_SISO_SWITCH_GI)
1486                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1487         return 0;
1488 }
1489
1490 /*
1491  * Try to switch to new modulation mode from MIMO
1492  */
1493 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1494                                  struct iwl_lq_sta *lq_sta,
1495                                  struct ieee80211_conf *conf,
1496                                  struct sta_info *sta, int index)
1497 {
1498         s8 is_green = lq_sta->is_green;
1499         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1500         struct iwl_scale_tbl_info *search_tbl =
1501                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1502         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1503         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1504                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1505         u8 start_action = tbl->action;
1506         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1507         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1508         int ret;
1509
1510         for (;;) {
1511                 lq_sta->action_counter++;
1512                 switch (tbl->action) {
1513                 case IWL_MIMO2_SWITCH_ANTENNA1:
1514                 case IWL_MIMO2_SWITCH_ANTENNA2:
1515                         IWL_DEBUG_RATE("LQ: MIMO toggle Antennas\n");
1516
1517                         if (tx_chains_num <= 2)
1518                                 break;
1519
1520                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1521                                 break;
1522
1523                         memcpy(search_tbl, tbl, sz);
1524                         if (rs_toggle_antenna(valid_tx_ant,
1525                                        &search_tbl->current_rate, search_tbl))
1526                                 goto out;
1527                         break;
1528                 case IWL_MIMO2_SWITCH_SISO_A:
1529                 case IWL_MIMO2_SWITCH_SISO_B:
1530                 case IWL_MIMO2_SWITCH_SISO_C:
1531                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1532
1533                         /* Set up new search table for SISO */
1534                         memcpy(search_tbl, tbl, sz);
1535
1536                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1537                                 search_tbl->ant_type = ANT_A;
1538                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1539                                 search_tbl->ant_type = ANT_B;
1540                         else
1541                                 search_tbl->ant_type = ANT_C;
1542
1543                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1544                                 break;
1545
1546                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1547                                                  search_tbl, index);
1548                         if (!ret)
1549                                 goto out;
1550
1551                         break;
1552
1553                 case IWL_MIMO2_SWITCH_GI:
1554                         if (!tbl->is_fat &&
1555                                 !(priv->current_ht_config.sgf &
1556                                                 HT_SHORT_GI_20MHZ))
1557                                 break;
1558                         if (tbl->is_fat &&
1559                                 !(priv->current_ht_config.sgf &
1560                                                 HT_SHORT_GI_40MHZ))
1561                                 break;
1562
1563                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1564
1565                         /* Set up new search table for MIMO */
1566                         memcpy(search_tbl, tbl, sz);
1567                         search_tbl->is_SGI = !tbl->is_SGI;
1568                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1569                         /*
1570                          * If active table already uses the fastest possible
1571                          * modulation (dual stream with short guard interval),
1572                          * and it's working well, there's no need to look
1573                          * for a better type of modulation!
1574                          */
1575                         if (tbl->is_SGI) {
1576                                 s32 tpt = lq_sta->last_tpt / 100;
1577                                 if (tpt >= search_tbl->expected_tpt[index])
1578                                         break;
1579                         }
1580                         search_tbl->current_rate = rate_n_flags_from_tbl(
1581                                                 search_tbl, index, is_green);
1582                         goto out;
1583
1584                 }
1585                 tbl->action++;
1586                 if (tbl->action > IWL_MIMO2_SWITCH_GI)
1587                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1588
1589                 if (tbl->action == start_action)
1590                         break;
1591         }
1592         search_tbl->lq_type = LQ_NONE;
1593         return 0;
1594  out:
1595         lq_sta->search_better_tbl = 1;
1596         tbl->action++;
1597         if (tbl->action > IWL_MIMO2_SWITCH_GI)
1598                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1599         return 0;
1600
1601 }
1602
1603 /*
1604  * Check whether we should continue using same modulation mode, or
1605  * begin search for a new mode, based on:
1606  * 1) # tx successes or failures while using this mode
1607  * 2) # times calling this function
1608  * 3) elapsed time in this mode (not used, for now)
1609  */
1610 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1611 {
1612         struct iwl_scale_tbl_info *tbl;
1613         int i;
1614         int active_tbl;
1615         int flush_interval_passed = 0;
1616         struct iwl_priv *priv;
1617
1618         priv = lq_sta->drv;
1619         active_tbl = lq_sta->active_tbl;
1620
1621         tbl = &(lq_sta->lq_info[active_tbl]);
1622
1623         /* If we've been disallowing search, see if we should now allow it */
1624         if (lq_sta->stay_in_tbl) {
1625
1626                 /* Elapsed time using current modulation mode */
1627                 if (lq_sta->flush_timer)
1628                         flush_interval_passed =
1629                             time_after(jiffies,
1630                                        (unsigned long)(lq_sta->flush_timer +
1631                                         IWL_RATE_SCALE_FLUSH_INTVL));
1632
1633                 /*
1634                  * Check if we should allow search for new modulation mode.
1635                  * If many frames have failed or succeeded, or we've used
1636                  * this same modulation for a long time, allow search, and
1637                  * reset history stats that keep track of whether we should
1638                  * allow a new search.  Also (below) reset all bitmaps and
1639                  * stats in active history.
1640                  */
1641                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1642                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1643                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1644                      && (flush_interval_passed))) {
1645                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1646                                      lq_sta->total_failed,
1647                                      lq_sta->total_success,
1648                                      flush_interval_passed);
1649
1650                         /* Allow search for new mode */
1651                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1652                         lq_sta->total_failed = 0;
1653                         lq_sta->total_success = 0;
1654                         lq_sta->flush_timer = 0;
1655
1656                 /*
1657                  * Else if we've used this modulation mode enough repetitions
1658                  * (regardless of elapsed time or success/failure), reset
1659                  * history bitmaps and rate-specific stats for all rates in
1660                  * active table.
1661                  */
1662                 } else {
1663                         lq_sta->table_count++;
1664                         if (lq_sta->table_count >=
1665                             lq_sta->table_count_limit) {
1666                                 lq_sta->table_count = 0;
1667
1668                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1669                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1670                                         rs_rate_scale_clear_window(
1671                                                 &(tbl->win[i]));
1672                         }
1673                 }
1674
1675                 /* If transitioning to allow "search", reset all history
1676                  * bitmaps and stats in active table (this will become the new
1677                  * "search" table). */
1678                 if (!lq_sta->stay_in_tbl) {
1679                         for (i = 0; i < IWL_RATE_COUNT; i++)
1680                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1681                 }
1682         }
1683 }
1684
1685 /*
1686  * Do rate scaling and search for new modulation mode.
1687  */
1688 static void rs_rate_scale_perform(struct iwl_priv *priv,
1689                                   struct net_device *dev,
1690                                   struct ieee80211_hdr *hdr,
1691                                   struct sta_info *sta)
1692 {
1693         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1694         struct ieee80211_hw *hw = local_to_hw(local);
1695         struct ieee80211_conf *conf = &hw->conf;
1696         int low = IWL_RATE_INVALID;
1697         int high = IWL_RATE_INVALID;
1698         int index;
1699         int i;
1700         struct iwl_rate_scale_data *window = NULL;
1701         int current_tpt = IWL_INVALID_VALUE;
1702         int low_tpt = IWL_INVALID_VALUE;
1703         int high_tpt = IWL_INVALID_VALUE;
1704         u32 fail_count;
1705         s8 scale_action = 0;
1706         __le16 fc;
1707         u16 rate_mask;
1708         u8 update_lq = 0;
1709         struct iwl_lq_sta *lq_sta;
1710         struct iwl_scale_tbl_info *tbl, *tbl1;
1711         u16 rate_scale_index_msk = 0;
1712         u32 rate;
1713         u8 is_green = 0;
1714         u8 active_tbl = 0;
1715         u8 done_search = 0;
1716         u16 high_low;
1717         s32 sr;
1718         u8 tid = MAX_TID_COUNT;
1719
1720         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1721
1722         fc = hdr->frame_control;
1723         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1724                 /* Send management frames and broadcast/multicast data using
1725                  * lowest rate. */
1726                 /* TODO: this could probably be improved.. */
1727                 return;
1728         }
1729
1730         if (!sta || !sta->rate_ctrl_priv)
1731                 return;
1732
1733         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
1734         lq_sta->supp_rates = sta->sta.supp_rates[lq_sta->band];
1735
1736         tid = rs_tl_add_packet(lq_sta, hdr);
1737
1738         /*
1739          * Select rate-scale / modulation-mode table to work with in
1740          * the rest of this function:  "search" if searching for better
1741          * modulation mode, or "active" if doing rate scaling within a mode.
1742          */
1743         if (!lq_sta->search_better_tbl)
1744                 active_tbl = lq_sta->active_tbl;
1745         else
1746                 active_tbl = 1 - lq_sta->active_tbl;
1747
1748         tbl = &(lq_sta->lq_info[active_tbl]);
1749         is_green = lq_sta->is_green;
1750
1751         /* current tx rate */
1752         index = lq_sta->last_txrate_idx;
1753
1754         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1755                        tbl->lq_type);
1756
1757         /* rates available for this association, and for modulation mode */
1758         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1759
1760         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1761
1762         /* mask with station rate restriction */
1763         if (is_legacy(tbl->lq_type)) {
1764                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1765                         /* supp_rates has no CCK bits in A mode */
1766                         rate_scale_index_msk = (u16) (rate_mask &
1767                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1768                 else
1769                         rate_scale_index_msk = (u16) (rate_mask &
1770                                                       lq_sta->supp_rates);
1771
1772         } else
1773                 rate_scale_index_msk = rate_mask;
1774
1775         if (!rate_scale_index_msk)
1776                 rate_scale_index_msk = rate_mask;
1777
1778         if (!((1 << index) & rate_scale_index_msk)) {
1779                 IWL_ERROR("Current Rate is not valid\n");
1780                 return;
1781         }
1782
1783         /* Get expected throughput table and history window for current rate */
1784         if (!tbl->expected_tpt) {
1785                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1786                 return;
1787         }
1788
1789         window = &(tbl->win[index]);
1790
1791         /*
1792          * If there is not enough history to calculate actual average
1793          * throughput, keep analyzing results of more tx frames, without
1794          * changing rate or mode (bypass most of the rest of this function).
1795          * Set up new rate table in uCode only if old rate is not supported
1796          * in current association (use new rate found above).
1797          */
1798         fail_count = window->counter - window->success_counter;
1799         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1800                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1801                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1802                                "for index %d\n",
1803                                window->success_counter, window->counter, index);
1804
1805                 /* Can't calculate this yet; not enough history */
1806                 window->average_tpt = IWL_INVALID_VALUE;
1807
1808                 /* Should we stay with this modulation mode,
1809                  * or search for a new one? */
1810                 rs_stay_in_table(lq_sta);
1811
1812                 goto out;
1813         }
1814
1815         /* Else we have enough samples; calculate estimate of
1816          * actual average throughput */
1817
1818         BUG_ON(window->average_tpt != ((window->success_ratio *
1819                         tbl->expected_tpt[index] + 64) / 128));
1820
1821         /* If we are searching for better modulation mode, check success. */
1822         if (lq_sta->search_better_tbl) {
1823
1824                 /* If good success, continue using the "search" mode;
1825                  * no need to send new link quality command, since we're
1826                  * continuing to use the setup that we've been trying. */
1827                 if (window->average_tpt > lq_sta->last_tpt) {
1828
1829                         IWL_DEBUG_RATE("LQ: SWITCHING TO NEW TABLE "
1830                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1831                                         window->success_ratio,
1832                                         window->average_tpt,
1833                                         lq_sta->last_tpt);
1834
1835                         if (!is_legacy(tbl->lq_type))
1836                                 lq_sta->enable_counter = 1;
1837
1838                         /* Swap tables; "search" becomes "active" */
1839                         lq_sta->active_tbl = active_tbl;
1840                         current_tpt = window->average_tpt;
1841
1842                 /* Else poor success; go back to mode in "active" table */
1843                 } else {
1844
1845                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1846                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1847                                         window->success_ratio,
1848                                         window->average_tpt,
1849                                         lq_sta->last_tpt);
1850
1851                         /* Nullify "search" table */
1852                         tbl->lq_type = LQ_NONE;
1853
1854                         /* Revert to "active" table */
1855                         active_tbl = lq_sta->active_tbl;
1856                         tbl = &(lq_sta->lq_info[active_tbl]);
1857
1858                         /* Revert to "active" rate and throughput info */
1859                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1860                         current_tpt = lq_sta->last_tpt;
1861
1862                         /* Need to set up a new rate table in uCode */
1863                         update_lq = 1;
1864                 }
1865
1866                 /* Either way, we've made a decision; modulation mode
1867                  * search is done, allow rate adjustment next time. */
1868                 lq_sta->search_better_tbl = 0;
1869                 done_search = 1;        /* Don't switch modes below! */
1870                 goto lq_update;
1871         }
1872
1873         /* (Else) not in search of better modulation mode, try for better
1874          * starting rate, while staying in this mode. */
1875         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1876                                         tbl->lq_type);
1877         low = high_low & 0xff;
1878         high = (high_low >> 8) & 0xff;
1879
1880         sr = window->success_ratio;
1881
1882         /* Collect measured throughputs for current and adjacent rates */
1883         current_tpt = window->average_tpt;
1884         if (low != IWL_RATE_INVALID)
1885                 low_tpt = tbl->win[low].average_tpt;
1886         if (high != IWL_RATE_INVALID)
1887                 high_tpt = tbl->win[high].average_tpt;
1888
1889         scale_action = 0;
1890
1891         /* Too many failures, decrease rate */
1892         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1893                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1894                 scale_action = -1;
1895
1896         /* No throughput measured yet for adjacent rates; try increase. */
1897         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1898                    (high_tpt == IWL_INVALID_VALUE)) {
1899
1900                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1901                         scale_action = 1;
1902                 else if (low != IWL_RATE_INVALID)
1903                         scale_action = -1;
1904         }
1905
1906         /* Both adjacent throughputs are measured, but neither one has better
1907          * throughput; we're using the best rate, don't change it! */
1908         else if ((low_tpt != IWL_INVALID_VALUE) &&
1909                  (high_tpt != IWL_INVALID_VALUE) &&
1910                  (low_tpt < current_tpt) &&
1911                  (high_tpt < current_tpt))
1912                 scale_action = 0;
1913
1914         /* At least one adjacent rate's throughput is measured,
1915          * and may have better performance. */
1916         else {
1917                 /* Higher adjacent rate's throughput is measured */
1918                 if (high_tpt != IWL_INVALID_VALUE) {
1919                         /* Higher rate has better throughput */
1920                         if (high_tpt > current_tpt &&
1921                                         sr >= IWL_RATE_INCREASE_TH) {
1922                                 scale_action = 1;
1923                         } else {
1924                                 IWL_DEBUG_RATE
1925                                     ("decrease rate because of high tpt\n");
1926                                 scale_action = -1;
1927                         }
1928
1929                 /* Lower adjacent rate's throughput is measured */
1930                 } else if (low_tpt != IWL_INVALID_VALUE) {
1931                         /* Lower rate has better throughput */
1932                         if (low_tpt > current_tpt) {
1933                                 IWL_DEBUG_RATE
1934                                     ("decrease rate because of low tpt\n");
1935                                 scale_action = -1;
1936                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1937                                 scale_action = 1;
1938                         }
1939                 }
1940         }
1941
1942         /* Sanity check; asked for decrease, but success rate or throughput
1943          * has been good at old rate.  Don't change it. */
1944         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1945                     ((sr > IWL_RATE_HIGH_TH) ||
1946                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1947                 scale_action = 0;
1948
1949         switch (scale_action) {
1950         case -1:
1951                 /* Decrease starting rate, update uCode's rate table */
1952                 if (low != IWL_RATE_INVALID) {
1953                         update_lq = 1;
1954                         index = low;
1955                 }
1956                 break;
1957         case 1:
1958                 /* Increase starting rate, update uCode's rate table */
1959                 if (high != IWL_RATE_INVALID) {
1960                         update_lq = 1;
1961                         index = high;
1962                 }
1963
1964                 break;
1965         case 0:
1966                 /* No change */
1967         default:
1968                 break;
1969         }
1970
1971         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1972                     "high %d type %d\n",
1973                      index, scale_action, low, high, tbl->lq_type);
1974
1975 lq_update:
1976         /* Replace uCode's rate table for the destination station. */
1977         if (update_lq) {
1978                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1979                 rs_fill_link_cmd(priv, lq_sta, rate);
1980                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1981         }
1982
1983         /* Should we stay with this modulation mode, or search for a new one? */
1984         rs_stay_in_table(lq_sta);
1985
1986         /*
1987          * Search for new modulation mode if we're:
1988          * 1)  Not changing rates right now
1989          * 2)  Not just finishing up a search
1990          * 3)  Allowing a new search
1991          */
1992         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1993                 /* Save current throughput to compare with "search" throughput*/
1994                 lq_sta->last_tpt = current_tpt;
1995
1996                 /* Select a new "search" modulation mode to try.
1997                  * If one is found, set up the new "search" table. */
1998                 if (is_legacy(tbl->lq_type))
1999                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2000                 else if (is_siso(tbl->lq_type))
2001                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2002                 else
2003                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
2004
2005                 /* If new "search" mode was selected, set up in uCode table */
2006                 if (lq_sta->search_better_tbl) {
2007                         /* Access the "search" table, clear its history. */
2008                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2009                         for (i = 0; i < IWL_RATE_COUNT; i++)
2010                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2011
2012                         /* Use new "search" start rate */
2013                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2014
2015                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
2016                                      tbl->current_rate, index);
2017                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2018                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2019                 }
2020
2021                 /* If the "active" (non-search) mode was legacy,
2022                  * and we've tried switching antennas,
2023                  * but we haven't been able to try HT modes (not available),
2024                  * stay with best antenna legacy modulation for a while
2025                  * before next round of mode comparisons. */
2026                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2027                 if (is_legacy(tbl1->lq_type) &&
2028                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2029                     (lq_sta->action_counter >= 1)) {
2030                         lq_sta->action_counter = 0;
2031                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2032                         rs_set_stay_in_table(priv, 1, lq_sta);
2033                 }
2034
2035                 /* If we're in an HT mode, and all 3 mode switch actions
2036                  * have been tried and compared, stay in this best modulation
2037                  * mode for a while before next round of mode comparisons. */
2038                 if (lq_sta->enable_counter &&
2039                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2040                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2041                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2042                             (tid != MAX_TID_COUNT)) {
2043                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2044                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2045                         }
2046                         lq_sta->action_counter = 0;
2047                         rs_set_stay_in_table(priv, 0, lq_sta);
2048                 }
2049
2050         /*
2051          * Else, don't search for a new modulation mode.
2052          * Put new timestamp in stay-in-modulation-mode flush timer if:
2053          * 1)  Not changing rates right now
2054          * 2)  Not just finishing up a search
2055          * 3)  flush timer is empty
2056          */
2057         } else {
2058                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2059                         lq_sta->flush_timer = jiffies;
2060         }
2061
2062 out:
2063         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2064         i = index;
2065         lq_sta->last_txrate_idx = i;
2066
2067         /* sta->txrate_idx is an index to A mode rates which start
2068          * at IWL_FIRST_OFDM_RATE
2069          */
2070         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2071                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2072         else
2073                 sta->txrate_idx = i;
2074
2075         return;
2076 }
2077
2078
2079 static void rs_initialize_lq(struct iwl_priv *priv,
2080                              struct ieee80211_conf *conf,
2081                              struct sta_info *sta)
2082 {
2083         struct iwl_lq_sta *lq_sta;
2084         struct iwl_scale_tbl_info *tbl;
2085         int rate_idx;
2086         int i;
2087         u32 rate;
2088         u8 use_green = rs_use_green(priv, conf);
2089         u8 active_tbl = 0;
2090         u8 valid_tx_ant;
2091
2092         if (!sta || !sta->rate_ctrl_priv)
2093                 goto out;
2094
2095         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2096         i = lq_sta->last_txrate_idx;
2097
2098         if ((lq_sta->lq.sta_id == 0xff) &&
2099             (priv->iw_mode == NL80211_IFTYPE_ADHOC))
2100                 goto out;
2101
2102         valid_tx_ant = priv->hw_params.valid_tx_ant;
2103
2104         if (!lq_sta->search_better_tbl)
2105                 active_tbl = lq_sta->active_tbl;
2106         else
2107                 active_tbl = 1 - lq_sta->active_tbl;
2108
2109         tbl = &(lq_sta->lq_info[active_tbl]);
2110
2111         if ((i < 0) || (i >= IWL_RATE_COUNT))
2112                 i = 0;
2113
2114         /* FIXME:RS: This is also wrong in 4965 */
2115         rate = iwl_rates[i].plcp;
2116         rate |= RATE_MCS_ANT_B_MSK;
2117         rate &= ~RATE_MCS_ANT_A_MSK;
2118
2119         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2120                 rate |= RATE_MCS_CCK_MSK;
2121
2122         tbl->ant_type = ANT_B;
2123         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2124         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2125             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2126
2127         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2128         tbl->current_rate = rate;
2129         rs_set_expected_tpt_table(lq_sta, tbl);
2130         rs_fill_link_cmd(NULL, lq_sta, rate);
2131         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2132  out:
2133         return;
2134 }
2135
2136 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2137                         struct ieee80211_supported_band *sband,
2138                         struct sk_buff *skb,
2139                         struct rate_selection *sel)
2140 {
2141
2142         int i;
2143         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2144         struct ieee80211_conf *conf = &local->hw.conf;
2145         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2146         struct sta_info *sta;
2147         __le16 fc;
2148         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2149         struct iwl_lq_sta *lq_sta;
2150
2151         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2152
2153         rcu_read_lock();
2154
2155         sta = sta_info_get(local, hdr->addr1);
2156
2157         /* Send management frames and broadcast/multicast data using lowest
2158          * rate. */
2159         fc = hdr->frame_control;
2160         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2161             !sta || !sta->rate_ctrl_priv) {
2162                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2163                 goto out;
2164         }
2165
2166         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2167         i = lq_sta->last_txrate_idx;
2168
2169         if ((priv->iw_mode == NL80211_IFTYPE_ADHOC) &&
2170             !lq_sta->ibss_sta_added) {
2171                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2172                 DECLARE_MAC_BUF(mac);
2173
2174                 if (sta_id == IWL_INVALID_STATION) {
2175                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2176                                        print_mac(mac, hdr->addr1));
2177                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2178                                                         0, CMD_ASYNC, NULL);
2179                 }
2180                 if ((sta_id != IWL_INVALID_STATION)) {
2181                         lq_sta->lq.sta_id = sta_id;
2182                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2183                         lq_sta->ibss_sta_added = 1;
2184                         rs_initialize_lq(priv, conf, sta);
2185                 }
2186         }
2187
2188         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2189                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2190                 goto out;
2191         }
2192
2193         if (sband->band == IEEE80211_BAND_5GHZ)
2194                 i -= IWL_FIRST_OFDM_RATE;
2195         sel->rate_idx = i;
2196 out:
2197         rcu_read_unlock();
2198 }
2199
2200 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2201 {
2202         struct iwl_lq_sta *lq_sta;
2203         struct iwl_priv *priv;
2204         int i, j;
2205
2206         priv = (struct iwl_priv *)priv_rate;
2207         IWL_DEBUG_RATE("create station rate scale window\n");
2208
2209         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2210
2211         if (lq_sta == NULL)
2212                 return NULL;
2213         lq_sta->lq.sta_id = 0xff;
2214
2215
2216         for (j = 0; j < LQ_SIZE; j++)
2217                 for (i = 0; i < IWL_RATE_COUNT; i++)
2218                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2219
2220         return lq_sta;
2221 }
2222
2223 static void rs_rate_init(void *priv_rate, void *priv_sta,
2224                          struct ieee80211_local *local,
2225                          struct sta_info *sta)
2226 {
2227         int i, j;
2228         struct ieee80211_conf *conf = &local->hw.conf;
2229         struct ieee80211_supported_band *sband;
2230         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2231         struct iwl_lq_sta *lq_sta = priv_sta;
2232
2233         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2234
2235         lq_sta->flush_timer = 0;
2236         lq_sta->supp_rates = sta->sta.supp_rates[sband->band];
2237         sta->txrate_idx = 3;
2238         for (j = 0; j < LQ_SIZE; j++)
2239                 for (i = 0; i < IWL_RATE_COUNT; i++)
2240                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2241
2242         IWL_DEBUG_RATE("LQ: *** rate scale station global init ***\n");
2243         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2244          * the lowest or the highest rate.. Could consider using RSSI from
2245          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2246          * after assoc.. */
2247
2248         lq_sta->ibss_sta_added = 0;
2249         if (priv->iw_mode == NL80211_IFTYPE_AP) {
2250                 u8 sta_id = iwl_find_station(priv, sta->sta.addr);
2251                 DECLARE_MAC_BUF(mac);
2252
2253                 /* for IBSS the call are from tasklet */
2254                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2255                              print_mac(mac, sta->sta.addr));
2256
2257                 if (sta_id == IWL_INVALID_STATION) {
2258                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2259                                        print_mac(mac, sta->sta.addr));
2260                         sta_id = iwl_add_station_flags(priv, sta->sta.addr,
2261                                                         0, CMD_ASYNC, NULL);
2262                 }
2263                 if ((sta_id != IWL_INVALID_STATION)) {
2264                         lq_sta->lq.sta_id = sta_id;
2265                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2266                 }
2267                 /* FIXME: this is w/a remove it later */
2268                 priv->assoc_station_added = 1;
2269         }
2270
2271         /* Find highest tx rate supported by hardware and destination station */
2272         for (i = 0; i < sband->n_bitrates; i++)
2273                 if (sta->sta.supp_rates[sband->band] & BIT(i))
2274                         sta->txrate_idx = i;
2275
2276         lq_sta->last_txrate_idx = sta->txrate_idx;
2277         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2278         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2279                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2280
2281         lq_sta->is_dup = 0;
2282         lq_sta->is_green = rs_use_green(priv, conf);
2283         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2284         lq_sta->active_rate_basic = priv->active_rate_basic;
2285         lq_sta->band = priv->band;
2286         /*
2287          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2288          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2289          */
2290         lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2291         lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2292         lq_sta->active_siso_rate &= ~((u16)0x2);
2293         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2294
2295         /* Same here */
2296         lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2297         lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2298         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2299         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2300
2301         lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2302         lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2303         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2304         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2305
2306         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2307                      lq_sta->active_siso_rate,
2308                      lq_sta->active_mimo2_rate,
2309                      lq_sta->active_mimo3_rate);
2310
2311         /* These values will be overriden later */
2312         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2313         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2314
2315         /* as default allow aggregation for all tids */
2316         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2317         lq_sta->drv = priv;
2318
2319         rs_initialize_lq(priv, conf, sta);
2320 }
2321
2322 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2323                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2324 {
2325         struct iwl_scale_tbl_info tbl_type;
2326         int index = 0;
2327         int rate_idx;
2328         int repeat_rate = 0;
2329         u8 ant_toggle_cnt = 0;
2330         u8 use_ht_possible = 1;
2331         u8 valid_tx_ant = 0;
2332         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2333
2334         /* Override starting rate (index 0) if needed for debug purposes */
2335         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2336
2337         /* Interpret new_rate (rate_n_flags) */
2338         memset(&tbl_type, 0, sizeof(tbl_type));
2339         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2340                                   &tbl_type, &rate_idx);
2341
2342         /* How many times should we repeat the initial rate? */
2343         if (is_legacy(tbl_type.lq_type)) {
2344                 ant_toggle_cnt = 1;
2345                 repeat_rate = IWL_NUMBER_TRY;
2346         } else {
2347                 repeat_rate = IWL_HT_NUMBER_TRY;
2348         }
2349
2350         lq_cmd->general_params.mimo_delimiter =
2351                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2352
2353         /* Fill 1st table entry (index 0) */
2354         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2355
2356         if (num_of_ant(tbl_type.ant_type) == 1) {
2357                 lq_cmd->general_params.single_stream_ant_msk =
2358                                                 tbl_type.ant_type;
2359         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2360                 lq_cmd->general_params.dual_stream_ant_msk =
2361                                                 tbl_type.ant_type;
2362         } /* otherwise we don't modify the existing value */
2363
2364         index++;
2365         repeat_rate--;
2366
2367         if (priv)
2368                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2369
2370         /* Fill rest of rate table */
2371         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2372                 /* Repeat initial/next rate.
2373                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2374                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2375                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2376                         if (is_legacy(tbl_type.lq_type)) {
2377                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2378                                         ant_toggle_cnt++;
2379                                 else if (priv &&
2380                                          rs_toggle_antenna(valid_tx_ant,
2381                                                         &new_rate, &tbl_type))
2382                                         ant_toggle_cnt = 1;
2383 }
2384
2385                         /* Override next rate if needed for debug purposes */
2386                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2387
2388                         /* Fill next table entry */
2389                         lq_cmd->rs_table[index].rate_n_flags =
2390                                         cpu_to_le32(new_rate);
2391                         repeat_rate--;
2392                         index++;
2393                 }
2394
2395                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2396                                                 &rate_idx);
2397
2398                 /* Indicate to uCode which entries might be MIMO.
2399                  * If initial rate was MIMO, this will finally end up
2400                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2401                 if (is_mimo(tbl_type.lq_type))
2402                         lq_cmd->general_params.mimo_delimiter = index;
2403
2404                 /* Get next rate */
2405                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2406                                              use_ht_possible);
2407
2408                 /* How many times should we repeat the next rate? */
2409                 if (is_legacy(tbl_type.lq_type)) {
2410                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2411                                 ant_toggle_cnt++;
2412                         else if (priv &&
2413                                  rs_toggle_antenna(valid_tx_ant,
2414                                                    &new_rate, &tbl_type))
2415                                 ant_toggle_cnt = 1;
2416
2417                         repeat_rate = IWL_NUMBER_TRY;
2418                 } else {
2419                         repeat_rate = IWL_HT_NUMBER_TRY;
2420                 }
2421
2422                 /* Don't allow HT rates after next pass.
2423                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2424                 use_ht_possible = 0;
2425
2426                 /* Override next rate if needed for debug purposes */
2427                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2428
2429                 /* Fill next table entry */
2430                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2431
2432                 index++;
2433                 repeat_rate--;
2434         }
2435
2436         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2437         lq_cmd->agg_params.agg_dis_start_th = 3;
2438         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2439 }
2440
2441 static void *rs_alloc(struct ieee80211_local *local)
2442 {
2443         return local->hw.priv;
2444 }
2445 /* rate scale requires free function to be implemented */
2446 static void rs_free(void *priv_rate)
2447 {
2448         return;
2449 }
2450
2451 static void rs_clear(void *priv_rate)
2452 {
2453 #ifdef CONFIG_IWLWIFI_DEBUG
2454         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2455
2456         IWL_DEBUG_RATE("enter\n");
2457
2458         /* TODO - add rate scale state reset */
2459
2460         IWL_DEBUG_RATE("leave\n");
2461 #endif /* CONFIG_IWLWIFI_DEBUG */
2462 }
2463
2464 static void rs_free_sta(void *priv_rate, void *priv_sta)
2465 {
2466         struct iwl_lq_sta *lq_sta = priv_sta;
2467         struct iwl_priv *priv;
2468
2469         priv = (struct iwl_priv *)priv_rate;
2470         IWL_DEBUG_RATE("enter\n");
2471         kfree(lq_sta);
2472         IWL_DEBUG_RATE("leave\n");
2473 }
2474
2475
2476 #ifdef CONFIG_MAC80211_DEBUGFS
2477 static int open_file_generic(struct inode *inode, struct file *file)
2478 {
2479         file->private_data = inode->i_private;
2480         return 0;
2481 }
2482 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2483                              u32 *rate_n_flags, int index)
2484 {
2485         struct iwl_priv *priv;
2486
2487         priv = lq_sta->drv;
2488         if (lq_sta->dbg_fixed_rate) {
2489                 if (index < 12) {
2490                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2491                 } else {
2492                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2493                                 *rate_n_flags = 0x800D;
2494                         else
2495                                 *rate_n_flags = 0x820A;
2496                 }
2497                 IWL_DEBUG_RATE("Fixed rate ON\n");
2498         } else {
2499                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2500         }
2501 }
2502
2503 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2504                         const char __user *user_buf, size_t count, loff_t *ppos)
2505 {
2506         struct iwl_lq_sta *lq_sta = file->private_data;
2507         struct iwl_priv *priv;
2508         char buf[64];
2509         int buf_size;
2510         u32 parsed_rate;
2511
2512         priv = lq_sta->drv;
2513         memset(buf, 0, sizeof(buf));
2514         buf_size = min(count, sizeof(buf) -  1);
2515         if (copy_from_user(buf, user_buf, buf_size))
2516                 return -EFAULT;
2517
2518         if (sscanf(buf, "%x", &parsed_rate) == 1)
2519                 lq_sta->dbg_fixed_rate = parsed_rate;
2520         else
2521                 lq_sta->dbg_fixed_rate = 0;
2522
2523         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2524         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2525         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2526         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2527
2528         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2529                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2530
2531         if (lq_sta->dbg_fixed_rate) {
2532                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2533                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2534         }
2535
2536         return count;
2537 }
2538
2539 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2540                         char __user *user_buf, size_t count, loff_t *ppos)
2541 {
2542         char buff[1024];
2543         int desc = 0;
2544         int i = 0;
2545
2546         struct iwl_lq_sta *lq_sta = file->private_data;
2547
2548         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2549         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2550                         lq_sta->total_failed, lq_sta->total_success,
2551                         lq_sta->active_legacy_rate);
2552         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2553                         lq_sta->dbg_fixed_rate);
2554         desc += sprintf(buff+desc, "general:"
2555                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2556                 lq_sta->lq.general_params.flags,
2557                 lq_sta->lq.general_params.mimo_delimiter,
2558                 lq_sta->lq.general_params.single_stream_ant_msk,
2559                 lq_sta->lq.general_params.dual_stream_ant_msk);
2560
2561         desc += sprintf(buff+desc, "agg:"
2562                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2563                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2564                         lq_sta->lq.agg_params.agg_dis_start_th,
2565                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2566
2567         desc += sprintf(buff+desc,
2568                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2569                         lq_sta->lq.general_params.start_rate_index[0],
2570                         lq_sta->lq.general_params.start_rate_index[1],
2571                         lq_sta->lq.general_params.start_rate_index[2],
2572                         lq_sta->lq.general_params.start_rate_index[3]);
2573
2574
2575         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2576                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2577                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2578
2579         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2580 }
2581
2582 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2583         .write = rs_sta_dbgfs_scale_table_write,
2584         .read = rs_sta_dbgfs_scale_table_read,
2585         .open = open_file_generic,
2586 };
2587 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2588                         char __user *user_buf, size_t count, loff_t *ppos)
2589 {
2590         char buff[1024];
2591         int desc = 0;
2592         int i, j;
2593
2594         struct iwl_lq_sta *lq_sta = file->private_data;
2595         for (i = 0; i < LQ_SIZE; i++) {
2596                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2597                                 "rate=0x%X\n",
2598                                 lq_sta->active_tbl == i?"*":"x",
2599                                 lq_sta->lq_info[i].lq_type,
2600                                 lq_sta->lq_info[i].is_SGI,
2601                                 lq_sta->lq_info[i].is_fat,
2602                                 lq_sta->lq_info[i].is_dup,
2603                                 lq_sta->lq_info[i].current_rate);
2604                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2605                         desc += sprintf(buff+desc,
2606                                 "counter=%d success=%d %%=%d\n",
2607                                 lq_sta->lq_info[i].win[j].counter,
2608                                 lq_sta->lq_info[i].win[j].success_counter,
2609                                 lq_sta->lq_info[i].win[j].success_ratio);
2610                 }
2611         }
2612         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2613 }
2614
2615 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2616         .read = rs_sta_dbgfs_stats_table_read,
2617         .open = open_file_generic,
2618 };
2619
2620 static void rs_add_debugfs(void *priv, void *priv_sta,
2621                                         struct dentry *dir)
2622 {
2623         struct iwl_lq_sta *lq_sta = priv_sta;
2624         lq_sta->rs_sta_dbgfs_scale_table_file =
2625                 debugfs_create_file("rate_scale_table", 0600, dir,
2626                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2627         lq_sta->rs_sta_dbgfs_stats_table_file =
2628                 debugfs_create_file("rate_stats_table", 0600, dir,
2629                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2630         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2631                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2632                 &lq_sta->tx_agg_tid_en);
2633
2634 }
2635
2636 static void rs_remove_debugfs(void *priv, void *priv_sta)
2637 {
2638         struct iwl_lq_sta *lq_sta = priv_sta;
2639         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2640         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2641         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2642 }
2643 #endif
2644
2645 static struct rate_control_ops rs_ops = {
2646         .module = NULL,
2647         .name = RS_NAME,
2648         .tx_status = rs_tx_status,
2649         .get_rate = rs_get_rate,
2650         .rate_init = rs_rate_init,
2651         .clear = rs_clear,
2652         .alloc = rs_alloc,
2653         .free = rs_free,
2654         .alloc_sta = rs_alloc_sta,
2655         .free_sta = rs_free_sta,
2656 #ifdef CONFIG_MAC80211_DEBUGFS
2657         .add_sta_debugfs = rs_add_debugfs,
2658         .remove_sta_debugfs = rs_remove_debugfs,
2659 #endif
2660 };
2661
2662 int iwlagn_rate_control_register(void)
2663 {
2664         return ieee80211_rate_control_register(&rs_ops);
2665 }
2666
2667 void iwlagn_rate_control_unregister(void)
2668 {
2669         ieee80211_rate_control_unregister(&rs_ops);
2670 }
2671