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
 168 static void rs_rate_scale_perform(struct iwl_priv *priv,
 169                                    struct net_device *dev,
 170                                    struct ieee80211_hdr *hdr,
 171                                    struct sta_info *sta);
 172 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 173                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 174
 175
 176 #ifdef CONFIG_MAC80211_DEBUGFS
 177 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 178                              u32 *rate_n_flags, int index);
 179 #else
 180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 181                              u32 *rate_n_flags, int index)
 182 {}
 183 #endif
 184
 185 /*
 186  * Expected throughput metrics for following rates:
 187  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 188  * "G" is the only table that supports CCK (the first 4 rates).
 189  */
 190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 192         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 193 };
 194
 195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 201 };
 202
 203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 205 };
 206
 207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 209 };
 210
 211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 213 };
 214
 215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 221 };
 222
 223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 225 };
 226
 227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 229 };
 230
 231 static inline u8 rs_extract_rate(u32 rate_n_flags)
 232 {
 233         return (u8)(rate_n_flags & 0xFF);
 234 }
 235
 236 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 237 {
 238         window->data = 0;
 239         window->success_counter = 0;
 240         window->success_ratio = IWL_INVALID_VALUE;
 241         window->counter = 0;
 242         window->average_tpt = IWL_INVALID_VALUE;
 243         window->stamp = 0;
 244 }
 245
 246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 247 {
 248         return (ant_type & valid_antenna) == ant_type;
 249 }
 250
 251 /*
 252  *      removes the old data from the statistics. All data that is older than
 253  *      TID_MAX_TIME_DIFF, will be deleted.
 254  */
 255 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 256 {
 257         /* The oldest age we want to keep */
 258         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 259
 260         while (tl->queue_count &&
 261                (tl->time_stamp < oldest_time)) {
 262                 tl->total -= tl->packet_count[tl->head];
 263                 tl->packet_count[tl->head] = 0;
 264                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 265                 tl->queue_count--;
 266                 tl->head++;
 267                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 268                         tl->head = 0;
 269         }
 270 }
 271
 272 /*
 273  *      increment traffic load value for tid and also remove
 274  *      any old values if passed the certain time period
 275  */
 276 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 277                            struct ieee80211_hdr *hdr)
 278 {
 279         u32 curr_time = jiffies_to_msecs(jiffies);
 280         u32 time_diff;
 281         s32 index;
 282         struct iwl_traffic_load *tl = NULL;
 283         __le16 fc = hdr->frame_control;
 284         u8 tid;
 285
 286         if (ieee80211_is_data_qos(fc)) {
 287                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 288                 tid = qc[0] & 0xf;
 289         } else
 290                 return MAX_TID_COUNT;
 291
 292         tl = &lq_data->load[tid];
 293
 294         curr_time -= curr_time % TID_ROUND_VALUE;
 295
 296         /* Happens only for the first packet. Initialize the data */
 297         if (!(tl->queue_count)) {
 298                 tl->total = 1;
 299                 tl->time_stamp = curr_time;
 300                 tl->queue_count = 1;
 301                 tl->head = 0;
 302                 tl->packet_count[0] = 1;
 303                 return MAX_TID_COUNT;
 304         }
 305
 306         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 307         index = time_diff / TID_QUEUE_CELL_SPACING;
 308
 309         /* The history is too long: remove data that is older than */
 310         /* TID_MAX_TIME_DIFF */
 311         if (index >= TID_QUEUE_MAX_SIZE)
 312                 rs_tl_rm_old_stats(tl, curr_time);
 313
 314         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 315         tl->packet_count[index] = tl->packet_count[index] + 1;
 316         tl->total = tl->total + 1;
 317
 318         if ((index + 1) > tl->queue_count)
 319                 tl->queue_count = index + 1;
 320
 321         return tid;
 322 }
 323
 324 /*
 325         get the traffic load value for tid
 326 */
 327 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 328 {
 329         u32 curr_time = jiffies_to_msecs(jiffies);
 330         u32 time_diff;
 331         s32 index;
 332         struct iwl_traffic_load *tl = NULL;
 333
 334         if (tid >= TID_MAX_LOAD_COUNT)
 335                 return 0;
 336
 337         tl = &(lq_data->load[tid]);
 338
 339         curr_time -= curr_time % TID_ROUND_VALUE;
 340
 341         if (!(tl->queue_count))
 342                 return 0;
 343
 344         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 345         index = time_diff / TID_QUEUE_CELL_SPACING;
 346
 347         /* The history is too long: remove data that is older than */
 348         /* TID_MAX_TIME_DIFF */
 349         if (index >= TID_QUEUE_MAX_SIZE)
 350                 rs_tl_rm_old_stats(tl, curr_time);
 351
 352         return tl->total;
 353 }
 354
 355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 356                                       struct iwl_lq_sta *lq_data, u8 tid,
 357                                       struct sta_info *sta)
 358 {
 359         unsigned long state;
 360         DECLARE_MAC_BUF(mac);
 361
 362         spin_lock_bh(&sta->lock);
 363         state = sta->ampdu_mlme.tid_state_tx[tid];
 364         spin_unlock_bh(&sta->lock);
 365
 366         if (state == HT_AGG_STATE_IDLE &&
 367             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 368                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 369                                 print_mac(mac, sta->addr), tid);
 370                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 371         }
 372 }
 373
 374 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 375                               struct iwl_lq_sta *lq_data,
 376                               struct sta_info *sta)
 377 {
 378         if ((tid < TID_MAX_LOAD_COUNT))
 379                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 380         else if (tid == IWL_AGG_ALL_TID)
 381                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 382                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 383 }
 384
 385 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 386 {
 387         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 388                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 389                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 390 }
 391
 392 /**
 393  * rs_collect_tx_data - Update the success/failure sliding window
 394  *
 395  * We keep a sliding window of the last 62 packets transmitted
 396  * at this rate.  window->data contains the bitmask of successful
 397  * packets.
 398  */
 399 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 400                               int scale_index, s32 tpt, int retries,
 401                               int successes)
 402 {
 403         struct iwl_rate_scale_data *window = NULL;
 404         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 405         s32 fail_count;
 406
 407         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 408                 return -EINVAL;
 409
 410         /* Select data for current tx bit rate */
 411         window = &(windows[scale_index]);
 412
 413         /*
 414          * Keep track of only the latest 62 tx frame attempts in this rate's
 415          * history window; anything older isn't really relevant any more.
 416          * If we have filled up the sliding window, drop the oldest attempt;
 417          * if the oldest attempt (highest bit in bitmap) shows "success",
 418          * subtract "1" from the success counter (this is the main reason
 419          * we keep these bitmaps!).
 420          */
 421         while (retries > 0) {
 422                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 423
 424                         /* remove earliest */
 425                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 426
 427                         if (window->data & mask) {
 428                                 window->data &= ~mask;
 429                                 window->success_counter--;
 430                         }
 431                 }
 432
 433                 /* Increment frames-attempted counter */
 434                 window->counter++;
 435
 436                 /* Shift bitmap by one frame (throw away oldest history),
 437                  * OR in "1", and increment "success" if this
 438                  * frame was successful. */
 439                 window->data <<= 1;
 440                 if (successes > 0) {
 441                         window->success_counter++;
 442                         window->data |= 0x1;
 443                         successes--;
 444                 }
 445
 446                 retries--;
 447         }
 448
 449         /* Calculate current success ratio, avoid divide-by-0! */
 450         if (window->counter > 0)
 451                 window->success_ratio = 128 * (100 * window->success_counter)
 452                                         / window->counter;
 453         else
 454                 window->success_ratio = IWL_INVALID_VALUE;
 455
 456         fail_count = window->counter - window->success_counter;
 457
 458         /* Calculate average throughput, if we have enough history. */
 459         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 460             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 461                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 462         else
 463                 window->average_tpt = IWL_INVALID_VALUE;
 464
 465         /* Tag this window as having been updated */
 466         window->stamp = jiffies;
 467
 468         return 0;
 469 }
 470
 471 /*
 472  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 473  */
 474 /* FIXME:RS:remove this function and put the flags statically in the table */
 475 static u32 rate_n_flags_from_tbl(struct iwl_scale_tbl_info *tbl,
 476                                        int index, u8 use_green)
 477 {
 478         u32 rate_n_flags = 0;
 479
 480         if (is_legacy(tbl->lq_type)) {
 481                 rate_n_flags = iwl_rates[index].plcp;
 482                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 483                         rate_n_flags |= RATE_MCS_CCK_MSK;
 484
 485         } else if (is_Ht(tbl->lq_type)) {
 486                 if (index > IWL_LAST_OFDM_RATE) {
 487                         IWL_ERROR("invalid HT rate index %d\n", index);
 488                         index = IWL_LAST_OFDM_RATE;
 489                 }
 490                 rate_n_flags = RATE_MCS_HT_MSK;
 491
 492                 if (is_siso(tbl->lq_type))
 493                         rate_n_flags |= iwl_rates[index].plcp_siso;
 494                 else if (is_mimo2(tbl->lq_type))
 495                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 496                 else
 497                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 498         } else {
 499                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 500         }
 501
 502         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 503                                                      RATE_MCS_ANT_ABC_MSK);
 504
 505         if (is_Ht(tbl->lq_type)) {
 506                 if (tbl->is_fat) {
 507                         if (tbl->is_dup)
 508                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 509                         else
 510                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 511                 }
 512                 if (tbl->is_SGI)
 513                         rate_n_flags |= RATE_MCS_SGI_MSK;
 514
 515                 if (use_green) {
 516                         rate_n_flags |= RATE_MCS_GF_MSK;
 517                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 518                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 519                                 IWL_ERROR("GF was set with SGI:SISO\n");
 520                         }
 521                 }
 522         }
 523         return rate_n_flags;
 524 }
 525
 526 /*
 527  * Interpret uCode API's rate_n_flags format,
 528  * fill "search" or "active" tx mode table.
 529  */
 530 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 531                                     enum ieee80211_band band,
 532                                     struct iwl_scale_tbl_info *tbl,
 533                                     int *rate_idx)
 534 {
 535         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 536         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 537         u8 mcs;
 538
 539         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 540
 541         if (*rate_idx  == IWL_RATE_INVALID) {
 542                 *rate_idx = -1;
 543                 return -EINVAL;
 544         }
 545         tbl->is_SGI = 0;        /* default legacy setup */
 546         tbl->is_fat = 0;
 547         tbl->is_dup = 0;
 548         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 549         tbl->lq_type = LQ_NONE;
 550
 551         /* legacy rate format */
 552         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 553                 if (num_of_ant == 1) {
 554                         if (band == IEEE80211_BAND_5GHZ)
 555                                 tbl->lq_type = LQ_A;
 556                         else
 557                                 tbl->lq_type = LQ_G;
 558                 }
 559         /* HT rate format */
 560         } else {
 561                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 562                         tbl->is_SGI = 1;
 563
 564                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 565                     (rate_n_flags & RATE_MCS_DUP_MSK))
 566                         tbl->is_fat = 1;
 567
 568                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 569                         tbl->is_dup = 1;
 570
 571                 mcs = rs_extract_rate(rate_n_flags);
 572
 573                 /* SISO */
 574                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 575                         if (num_of_ant == 1)
 576                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 577                 /* MIMO2 */
 578                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 579                         if (num_of_ant == 2)
 580                                 tbl->lq_type = LQ_MIMO2;
 581                 /* MIMO3 */
 582                 } else {
 583                         if (num_of_ant == 3)
 584                                 tbl->lq_type = LQ_MIMO3;
 585                 }
 586         }
 587         return 0;
 588 }
 589
 590 /* switch to another antenna/antennas and return 1 */
 591 /* if no other valid antenna found, return 0 */
 592 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 593                              struct iwl_scale_tbl_info *tbl)
 594 {
 595         u8 new_ant_type;
 596
 597         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 598                 return 0;
 599
 600         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 601                 return 0;
 602
 603         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 604
 605         while ((new_ant_type != tbl->ant_type) &&
 606                !rs_is_valid_ant(valid_ant, new_ant_type))
 607                 new_ant_type = ant_toggle_lookup[new_ant_type];
 608
 609         if (new_ant_type == tbl->ant_type)
 610                 return 0;
 611
 612         tbl->ant_type = new_ant_type;
 613         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 614         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 615         return 1;
 616 }
 617
 618 /* FIXME:RS: in 4965 we don't use greenfield at all */
 619 /* FIXME:RS: don't use greenfield for now in TX */
 620 #if 0
 621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 622 {
 623         return (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 624                 priv->current_ht_config.is_green_field &&
 625                 !priv->current_ht_config.non_GF_STA_present;
 626 }
 627 #endif
 628 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 629 {
 630         return 0;
 631 }
 632
 633 /**
 634  * rs_get_supported_rates - get the available rates
 635  *
 636  * if management frame or broadcast frame only return
 637  * basic available rates.
 638  *
 639  */
 640 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 641                                   struct ieee80211_hdr *hdr,
 642                                   enum iwl_table_type rate_type)
 643 {
 644         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 645             lq_sta->active_rate_basic)
 646                 return lq_sta->active_rate_basic;
 647
 648         if (is_legacy(rate_type)) {
 649                 return lq_sta->active_legacy_rate;
 650         } else {
 651                 if (is_siso(rate_type))
 652                         return lq_sta->active_siso_rate;
 653                 else if (is_mimo2(rate_type))
 654                         return lq_sta->active_mimo2_rate;
 655                 else
 656                         return lq_sta->active_mimo3_rate;
 657         }
 658 }
 659
 660 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 661                                 int rate_type)
 662 {
 663         u8 high = IWL_RATE_INVALID;
 664         u8 low = IWL_RATE_INVALID;
 665
 666         /* 802.11A or ht walks to the next literal adjacent rate in
 667          * the rate table */
 668         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 669                 int i;
 670                 u32 mask;
 671
 672                 /* Find the previous rate that is in the rate mask */
 673                 i = index - 1;
 674                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 675                         if (rate_mask & mask) {
 676                                 low = i;
 677                                 break;
 678                         }
 679                 }
 680
 681                 /* Find the next rate that is in the rate mask */
 682                 i = index + 1;
 683                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 684                         if (rate_mask & mask) {
 685                                 high = i;
 686                                 break;
 687                         }
 688                 }
 689
 690                 return (high << 8) | low;
 691         }
 692
 693         low = index;
 694         while (low != IWL_RATE_INVALID) {
 695                 low = iwl_rates[low].prev_rs;
 696                 if (low == IWL_RATE_INVALID)
 697                         break;
 698                 if (rate_mask & (1 << low))
 699                         break;
 700                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 701         }
 702
 703         high = index;
 704         while (high != IWL_RATE_INVALID) {
 705                 high = iwl_rates[high].next_rs;
 706                 if (high == IWL_RATE_INVALID)
 707                         break;
 708                 if (rate_mask & (1 << high))
 709                         break;
 710                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 711         }
 712
 713         return (high << 8) | low;
 714 }
 715
 716 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 717                              struct iwl_scale_tbl_info *tbl,
 718                              u8 scale_index, u8 ht_possible)
 719 {
 720         s32 low;
 721         u16 rate_mask;
 722         u16 high_low;
 723         u8 switch_to_legacy = 0;
 724         u8 is_green = lq_sta->is_green;
 725
 726         /* check if we need to switch from HT to legacy rates.
 727          * assumption is that mandatory rates (1Mbps or 6Mbps)
 728          * are always supported (spec demand) */
 729         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 730                 switch_to_legacy = 1;
 731                 scale_index = rs_ht_to_legacy[scale_index];
 732                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 733                         tbl->lq_type = LQ_A;
 734                 else
 735                         tbl->lq_type = LQ_G;
 736
 737                 if (num_of_ant(tbl->ant_type) > 1)
 738                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 739
 740                 tbl->is_fat = 0;
 741                 tbl->is_SGI = 0;
 742         }
 743
 744         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 745
 746         /* Mask with station rate restriction */
 747         if (is_legacy(tbl->lq_type)) {
 748                 /* supp_rates has no CCK bits in A mode */
 749                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 750                         rate_mask  = (u16)(rate_mask &
 751                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 752                 else
 753                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 754         }
 755
 756         /* If we switched from HT to legacy, check current rate */
 757         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 758                 low = scale_index;
 759                 goto out;
 760         }
 761
 762         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 763                                         tbl->lq_type);
 764         low = high_low & 0xff;
 765
 766         if (low == IWL_RATE_INVALID)
 767                 low = scale_index;
 768
 769 out:
 770         return rate_n_flags_from_tbl(tbl, low, is_green);
 771 }
 772
 773 /*
 774  * mac80211 sends us Tx status
 775  */
 776 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 777                          struct sk_buff *skb)
 778 {
 779         int status;
 780         u8 retries;
 781         int rs_index, index = 0;
 782         struct iwl_lq_sta *lq_sta;
 783         struct iwl_link_quality_cmd *table;
 784         struct sta_info *sta;
 785         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 786         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 787         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 788         struct ieee80211_hw *hw = local_to_hw(local);
 789         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 790         struct iwl_rate_scale_data *window = NULL;
 791         struct iwl_rate_scale_data *search_win = NULL;
 792         u32 tx_rate;
 793         struct iwl_scale_tbl_info tbl_type;
 794         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 795         u8 active_index = 0;
 796         __le16 fc = hdr->frame_control;
 797         s32 tpt = 0;
 798
 799         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 800
 801         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 802                 return;
 803
 804         /* This packet was aggregated but doesn't carry rate scale info */
 805         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 806             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 807                 return;
 808
 809         retries = info->status.retry_count;
 810
 811         if (retries > 15)
 812                 retries = 15;
 813
 814         rcu_read_lock();
 815
 816         sta = sta_info_get(local, hdr->addr1);
 817
 818         if (!sta || !sta->rate_ctrl_priv)
 819                 goto out;
 820
 821
 822         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
 823
 824         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 825             !lq_sta->ibss_sta_added)
 826                 goto out;
 827
 828         table = &lq_sta->lq;
 829         active_index = lq_sta->active_tbl;
 830
 831         curr_tbl = &(lq_sta->lq_info[active_index]);
 832         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 833         window = (struct iwl_rate_scale_data *)&(curr_tbl->win[0]);
 834         search_win = (struct iwl_rate_scale_data *)&(search_tbl->win[0]);
 835
 836         /*
 837          * Ignore this Tx frame response if its initial rate doesn't match
 838          * that of latest Link Quality command.  There may be stragglers
 839          * from a previous Link Quality command, but we're no longer interested
 840          * in those; they're either from the "active" mode while we're trying
 841          * to check "search" mode, or a prior "search" mode after we've moved
 842          * to a new "search" mode (which might become the new "active" mode).
 843          */
 844         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 845         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 846         if (priv->band == IEEE80211_BAND_5GHZ)
 847                 rs_index -= IWL_FIRST_OFDM_RATE;
 848
 849         if ((info->tx_rate_idx < 0) ||
 850             (tbl_type.is_SGI ^
 851                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 852             (tbl_type.is_fat ^
 853                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 854             (tbl_type.is_dup ^
 855                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 856             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 857             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 858                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 859             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 860                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 861             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 862              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 863                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 864                 goto out;
 865         }
 866
 867         /* Update frame history window with "failure" for each Tx retry. */
 868         while (retries) {
 869                 /* Look up the rate and other info used for each tx attempt.
 870                  * Each tx attempt steps one entry deeper in the rate table. */
 871                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 872                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 873                                           &tbl_type, &rs_index);
 874
 875                 /* If type matches "search" table,
 876                  * add failure to "search" history */
 877                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 878                     (tbl_type.ant_type == search_tbl->ant_type) &&
 879                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 880                         if (search_tbl->expected_tpt)
 881                                 tpt = search_tbl->expected_tpt[rs_index];
 882                         else
 883                                 tpt = 0;
 884                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 885
 886                 /* Else if type matches "current/active" table,
 887                  * add failure to "current/active" history */
 888                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 889                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 890                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 891                         if (curr_tbl->expected_tpt)
 892                                 tpt = curr_tbl->expected_tpt[rs_index];
 893                         else
 894                                 tpt = 0;
 895                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 896                 }
 897
 898                 /* If not searching for a new mode, increment failed counter
 899                  * ... this helps determine when to start searching again */
 900                 if (lq_sta->stay_in_tbl)
 901                         lq_sta->total_failed++;
 902                 --retries;
 903                 index++;
 904
 905         }
 906
 907         /*
 908          * Find (by rate) the history window to update with final Tx attempt;
 909          * if Tx was successful first try, use original rate,
 910          * else look up the rate that was, finally, successful.
 911          */
 912         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 913         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 914
 915         /* Update frame history window with "success" if Tx got ACKed ... */
 916         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 917
 918         /* If type matches "search" table,
 919          * add final tx status to "search" history */
 920         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 921             (tbl_type.ant_type == search_tbl->ant_type) &&
 922             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 923                 if (search_tbl->expected_tpt)
 924                         tpt = search_tbl->expected_tpt[rs_index];
 925                 else
 926                         tpt = 0;
 927                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 928                         rs_collect_tx_data(search_win, rs_index, tpt,
 929                                            info->status.ampdu_ack_len,
 930                                            info->status.ampdu_ack_map);
 931                 else
 932                         rs_collect_tx_data(search_win, rs_index, tpt,
 933                                            1, status);
 934         /* Else if type matches "current/active" table,
 935          * add final tx status to "current/active" history */
 936         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 937                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 938                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 939                 if (curr_tbl->expected_tpt)
 940                         tpt = curr_tbl->expected_tpt[rs_index];
 941                 else
 942                         tpt = 0;
 943                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 944                         rs_collect_tx_data(window, rs_index, tpt,
 945                                            info->status.ampdu_ack_len,
 946                                            info->status.ampdu_ack_map);
 947                 else
 948                         rs_collect_tx_data(window, rs_index, tpt,
 949                                            1, status);
 950         }
 951
 952         /* If not searching for new mode, increment success/failed counter
 953          * ... these help determine when to start searching again */
 954         if (lq_sta->stay_in_tbl) {
 955                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 956                         lq_sta->total_success += info->status.ampdu_ack_map;
 957                         lq_sta->total_failed +=
 958                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 959                 } else {
 960                         if (status)
 961                                 lq_sta->total_success++;
 962                         else
 963                                 lq_sta->total_failed++;
 964                 }
 965         }
 966
 967         /* See if there's a better rate or modulation mode to try. */
 968         rs_rate_scale_perform(priv, dev, hdr, sta);
 969 out:
 970         rcu_read_unlock();
 971         return;
 972 }
 973
 974 /*
 975  * Begin a period of staying with a selected modulation mode.
 976  * Set "stay_in_tbl" flag to prevent any mode switches.
 977  * Set frame tx success limits according to legacy vs. high-throughput,
 978  * and reset overall (spanning all rates) tx success history statistics.
 979  * These control how long we stay using same modulation mode before
 980  * searching for a new mode.
 981  */
 982 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 983                                  struct iwl_lq_sta *lq_sta)
 984 {
 985         IWL_DEBUG_RATE("we are staying in the same table\n");
 986         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 987         if (is_legacy) {
 988                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 989                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 990                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 991         } else {
 992                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 993                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 994                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 995         }
 996         lq_sta->table_count = 0;
 997         lq_sta->total_failed = 0;
 998         lq_sta->total_success = 0;
 999 }
1000
1001 /*
1002  * Find correct throughput table for given mode of modulation
1003  */
1004 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1005                                       struct iwl_scale_tbl_info *tbl)
1006 {
1007         if (is_legacy(tbl->lq_type)) {
1008                 if (!is_a_band(tbl->lq_type))
1009                         tbl->expected_tpt = expected_tpt_G;
1010                 else
1011                         tbl->expected_tpt = expected_tpt_A;
1012         } else if (is_siso(tbl->lq_type)) {
1013                 if (tbl->is_fat && !lq_sta->is_dup)
1014                         if (tbl->is_SGI)
1015                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1016                         else
1017                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1018                 else if (tbl->is_SGI)
1019                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1020                 else
1021                         tbl->expected_tpt = expected_tpt_siso20MHz;
1022
1023         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1024                 if (tbl->is_fat && !lq_sta->is_dup)
1025                         if (tbl->is_SGI)
1026                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1027                         else
1028                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1029                 else if (tbl->is_SGI)
1030                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1031                 else
1032                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1033         } else
1034                 tbl->expected_tpt = expected_tpt_G;
1035 }
1036
1037 /*
1038  * Find starting rate for new "search" high-throughput mode of modulation.
1039  * Goal is to find lowest expected rate (under perfect conditions) that is
1040  * above the current measured throughput of "active" mode, to give new mode
1041  * a fair chance to prove itself without too many challenges.
1042  *
1043  * This gets called when transitioning to more aggressive modulation
1044  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1045  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1046  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1047  * bit rate will typically need to increase, but not if performance was bad.
1048  */
1049 static s32 rs_get_best_rate(struct iwl_priv *priv,
1050                             struct iwl_lq_sta *lq_sta,
1051                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1052                             u16 rate_mask, s8 index)
1053 {
1054         /* "active" values */
1055         struct iwl_scale_tbl_info *active_tbl =
1056             &(lq_sta->lq_info[lq_sta->active_tbl]);
1057         s32 active_sr = active_tbl->win[index].success_ratio;
1058         s32 active_tpt = active_tbl->expected_tpt[index];
1059
1060         /* expected "search" throughput */
1061         s32 *tpt_tbl = tbl->expected_tpt;
1062
1063         s32 new_rate, high, low, start_hi;
1064         u16 high_low;
1065         s8 rate = index;
1066
1067         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1068
1069         for (; ;) {
1070                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1071                                                 tbl->lq_type);
1072
1073                 low = high_low & 0xff;
1074                 high = (high_low >> 8) & 0xff;
1075
1076                 /*
1077                  * Lower the "search" bit rate, to give new "search" mode
1078                  * approximately the same throughput as "active" if:
1079                  *
1080                  * 1) "Active" mode has been working modestly well (but not
1081                  *    great), and expected "search" throughput (under perfect
1082                  *    conditions) at candidate rate is above the actual
1083                  *    measured "active" throughput (but less than expected
1084                  *    "active" throughput under perfect conditions).
1085                  * OR
1086                  * 2) "Active" mode has been working perfectly or very well
1087                  *    and expected "search" throughput (under perfect
1088                  *    conditions) at candidate rate is above expected
1089                  *    "active" throughput (under perfect conditions).
1090                  */
1091                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1092                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1093                       (active_sr <= IWL_RATE_HIGH_TH) &&
1094                       (tpt_tbl[rate] <= active_tpt))) ||
1095                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1096                      (tpt_tbl[rate] > active_tpt))) {
1097
1098                         /* (2nd or later pass)
1099                          * If we've already tried to raise the rate, and are
1100                          * now trying to lower it, use the higher rate. */
1101                         if (start_hi != IWL_RATE_INVALID) {
1102                                 new_rate = start_hi;
1103                                 break;
1104                         }
1105
1106                         new_rate = rate;
1107
1108                         /* Loop again with lower rate */
1109                         if (low != IWL_RATE_INVALID)
1110                                 rate = low;
1111
1112                         /* Lower rate not available, use the original */
1113                         else
1114                                 break;
1115
1116                 /* Else try to raise the "search" rate to match "active" */
1117                 } else {
1118                         /* (2nd or later pass)
1119                          * If we've already tried to lower the rate, and are
1120                          * now trying to raise it, use the lower rate. */
1121                         if (new_rate != IWL_RATE_INVALID)
1122                                 break;
1123
1124                         /* Loop again with higher rate */
1125                         else if (high != IWL_RATE_INVALID) {
1126                                 start_hi = high;
1127                                 rate = high;
1128
1129                         /* Higher rate not available, use the original */
1130                         } else {
1131                                 new_rate = rate;
1132                                 break;
1133                         }
1134                 }
1135         }
1136
1137         return new_rate;
1138 }
1139
1140 /*
1141  * Set up search table for MIMO
1142  */
1143 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1144                              struct iwl_lq_sta *lq_sta,
1145                              struct ieee80211_conf *conf,
1146                              struct sta_info *sta,
1147                              struct iwl_scale_tbl_info *tbl, int index)
1148 {
1149         u16 rate_mask;
1150         s32 rate;
1151         s8 is_green = lq_sta->is_green;
1152
1153         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1154             !sta->ht_info.ht_supported)
1155                 return -1;
1156
1157         if (((sta->ht_info.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1158                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1159                 return -1;
1160
1161         /* Need both Tx chains/antennas to support MIMO */
1162         if (priv->hw_params.tx_chains_num < 2)
1163                 return -1;
1164
1165         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1166
1167         tbl->lq_type = LQ_MIMO2;
1168         tbl->is_dup = lq_sta->is_dup;
1169         tbl->action = 0;
1170         rate_mask = lq_sta->active_mimo2_rate;
1171
1172         if (priv->current_ht_config.supported_chan_width
1173                                         == IWL_CHANNEL_WIDTH_40MHZ)
1174                 tbl->is_fat = 1;
1175         else
1176                 tbl->is_fat = 0;
1177
1178         /* FIXME: - don't toggle SGI here
1179         if (tbl->is_fat) {
1180                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1181                         tbl->is_SGI = 1;
1182                 else
1183                         tbl->is_SGI = 0;
1184         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1185                 tbl->is_SGI = 1;
1186         else
1187                 tbl->is_SGI = 0;
1188         */
1189
1190         rs_set_expected_tpt_table(lq_sta, tbl);
1191
1192         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1193
1194         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1195
1196         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1197                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1198                                                 rate, rate_mask);
1199                 return -1;
1200         }
1201         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1202
1203         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1204                      tbl->current_rate, is_green);
1205         return 0;
1206 }
1207
1208 /*
1209  * Set up search table for SISO
1210  */
1211 static int rs_switch_to_siso(struct iwl_priv *priv,
1212                              struct iwl_lq_sta *lq_sta,
1213                              struct ieee80211_conf *conf,
1214                              struct sta_info *sta,
1215                              struct iwl_scale_tbl_info *tbl, int index)
1216 {
1217         u16 rate_mask;
1218         u8 is_green = lq_sta->is_green;
1219         s32 rate;
1220
1221         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1222             !sta->ht_info.ht_supported)
1223                 return -1;
1224
1225         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1226
1227         tbl->is_dup = lq_sta->is_dup;
1228         tbl->lq_type = LQ_SISO;
1229         tbl->action = 0;
1230         rate_mask = lq_sta->active_siso_rate;
1231
1232         if (priv->current_ht_config.supported_chan_width
1233             == IWL_CHANNEL_WIDTH_40MHZ)
1234                 tbl->is_fat = 1;
1235         else
1236                 tbl->is_fat = 0;
1237
1238         /* FIXME: - don't toggle SGI here
1239         if (tbl->is_fat) {
1240                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1241                         tbl->is_SGI = 1;
1242                 else
1243                         tbl->is_SGI = 0;
1244         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1245                 tbl->is_SGI = 1;
1246         else
1247                 tbl->is_SGI = 0;
1248         */
1249
1250         if (is_green)
1251                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1252
1253         rs_set_expected_tpt_table(lq_sta, tbl);
1254         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1255
1256         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1257         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1258                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1259                              rate, rate_mask);
1260                 return -1;
1261         }
1262         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1263         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1264                      tbl->current_rate, is_green);
1265         return 0;
1266 }
1267
1268 /*
1269  * Try to switch to new modulation mode from legacy
1270  */
1271 static int rs_move_legacy_other(struct iwl_priv *priv,
1272                                 struct iwl_lq_sta *lq_sta,
1273                                 struct ieee80211_conf *conf,
1274                                 struct sta_info *sta,
1275                                 int index)
1276 {
1277         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1278         struct iwl_scale_tbl_info *search_tbl =
1279                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1280         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1281         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1282                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1283         u8 start_action = tbl->action;
1284         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1285         int ret = 0;
1286
1287         for (; ;) {
1288                 switch (tbl->action) {
1289                 case IWL_LEGACY_SWITCH_ANTENNA:
1290                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1291
1292                         lq_sta->action_counter++;
1293
1294                         /* Don't change antenna if success has been great */
1295                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1296                                 break;
1297
1298                         /* Set up search table to try other antenna */
1299                         memcpy(search_tbl, tbl, sz);
1300
1301                         if (rs_toggle_antenna(valid_tx_ant,
1302                                 &search_tbl->current_rate, search_tbl)) {
1303                                 lq_sta->search_better_tbl = 1;
1304                                 goto out;
1305                         }
1306                         break;
1307                 case IWL_LEGACY_SWITCH_SISO:
1308                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1309
1310                         /* Set up search table to try SISO */
1311                         memcpy(search_tbl, tbl, sz);
1312                         search_tbl->is_SGI = 0;
1313                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1314                                                  search_tbl, index);
1315                         if (!ret) {
1316                                 lq_sta->search_better_tbl = 1;
1317                                 lq_sta->action_counter = 0;
1318                                 goto out;
1319                         }
1320
1321                         break;
1322                 case IWL_LEGACY_SWITCH_MIMO2:
1323                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1324
1325                         /* Set up search table to try MIMO */
1326                         memcpy(search_tbl, tbl, sz);
1327                         search_tbl->is_SGI = 0;
1328                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1329                                 /*FIXME:RS:need to check ant validity*/
1330                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1331                                                  search_tbl, index);
1332                         if (!ret) {
1333                                 lq_sta->search_better_tbl = 1;
1334                                 lq_sta->action_counter = 0;
1335                                 goto out;
1336                         }
1337                         break;
1338                 }
1339                 tbl->action++;
1340                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1341                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1342
1343                 if (tbl->action == start_action)
1344                         break;
1345
1346         }
1347         return 0;
1348
1349  out:
1350         tbl->action++;
1351         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1352                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1353         return 0;
1354
1355 }
1356
1357 /*
1358  * Try to switch to new modulation mode from SISO
1359  */
1360 static int rs_move_siso_to_other(struct iwl_priv *priv,
1361                                  struct iwl_lq_sta *lq_sta,
1362                                  struct ieee80211_conf *conf,
1363                                  struct sta_info *sta, int index)
1364 {
1365         u8 is_green = lq_sta->is_green;
1366         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1367         struct iwl_scale_tbl_info *search_tbl =
1368                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1369         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1370         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1371                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1372         u8 start_action = tbl->action;
1373         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1374         int ret;
1375
1376         for (;;) {
1377                 lq_sta->action_counter++;
1378                 switch (tbl->action) {
1379                 case IWL_SISO_SWITCH_ANTENNA:
1380                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1381                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1382                                 break;
1383
1384                         memcpy(search_tbl, tbl, sz);
1385                         if (rs_toggle_antenna(valid_tx_ant,
1386                                        &search_tbl->current_rate, search_tbl)) {
1387                                 lq_sta->search_better_tbl = 1;
1388                                 goto out;
1389                         }
1390                         break;
1391                 case IWL_SISO_SWITCH_MIMO2:
1392                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1393                         memcpy(search_tbl, tbl, sz);
1394                         search_tbl->is_SGI = 0;
1395                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1396                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1397                                                  search_tbl, index);
1398                         if (!ret) {
1399                                 lq_sta->search_better_tbl = 1;
1400                                 goto out;
1401                         }
1402                         break;
1403                 case IWL_SISO_SWITCH_GI:
1404                         if (!tbl->is_fat &&
1405                                 !(priv->current_ht_config.sgf &
1406                                                 HT_SHORT_GI_20MHZ))
1407                                 break;
1408                         if (tbl->is_fat &&
1409                                 !(priv->current_ht_config.sgf &
1410                                                 HT_SHORT_GI_40MHZ))
1411                                 break;
1412
1413                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1414
1415                         memcpy(search_tbl, tbl, sz);
1416                         if (is_green) {
1417                                 if (!tbl->is_SGI)
1418                                         break;
1419                                 else
1420                                         IWL_ERROR("SGI was set in GF+SISO\n");
1421                         }
1422                         search_tbl->is_SGI = !tbl->is_SGI;
1423                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1424                         if (tbl->is_SGI) {
1425                                 s32 tpt = lq_sta->last_tpt / 100;
1426                                 if (tpt >= search_tbl->expected_tpt[index])
1427                                         break;
1428                         }
1429                         search_tbl->current_rate = rate_n_flags_from_tbl(
1430                                                 search_tbl, index, is_green);
1431                         lq_sta->search_better_tbl = 1;
1432                         goto out;
1433                 }
1434                 tbl->action++;
1435                 if (tbl->action > IWL_SISO_SWITCH_GI)
1436                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1437
1438                 if (tbl->action == start_action)
1439                         break;
1440         }
1441         return 0;
1442
1443  out:
1444         tbl->action++;
1445         if (tbl->action > IWL_SISO_SWITCH_GI)
1446                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1447         return 0;
1448 }
1449
1450 /*
1451  * Try to switch to new modulation mode from MIMO
1452  */
1453 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1454                                  struct iwl_lq_sta *lq_sta,
1455                                  struct ieee80211_conf *conf,
1456                                  struct sta_info *sta, int index)
1457 {
1458         s8 is_green = lq_sta->is_green;
1459         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1460         struct iwl_scale_tbl_info *search_tbl =
1461                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1462         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1463                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1464         u8 start_action = tbl->action;
1465         /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1466         int ret;
1467
1468         for (;;) {
1469                 lq_sta->action_counter++;
1470                 switch (tbl->action) {
1471                 case IWL_MIMO_SWITCH_ANTENNA_A:
1472                 case IWL_MIMO_SWITCH_ANTENNA_B:
1473                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1474
1475                         /* Set up new search table for SISO */
1476                         memcpy(search_tbl, tbl, sz);
1477
1478                         /*FIXME:RS:need to check ant validity + C*/
1479                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1480                                 search_tbl->ant_type = ANT_A;
1481                         else
1482                                 search_tbl->ant_type = ANT_B;
1483
1484                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1485                                                  search_tbl, index);
1486                         if (!ret) {
1487                                 lq_sta->search_better_tbl = 1;
1488                                 goto out;
1489                         }
1490                         break;
1491
1492                 case IWL_MIMO_SWITCH_GI:
1493                         if (!tbl->is_fat &&
1494                                 !(priv->current_ht_config.sgf &
1495                                                 HT_SHORT_GI_20MHZ))
1496                                 break;
1497                         if (tbl->is_fat &&
1498                                 !(priv->current_ht_config.sgf &
1499                                                 HT_SHORT_GI_40MHZ))
1500                                 break;
1501
1502                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1503
1504                         /* Set up new search table for MIMO */
1505                         memcpy(search_tbl, tbl, sz);
1506                         search_tbl->is_SGI = !tbl->is_SGI;
1507                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1508                         /*
1509                          * If active table already uses the fastest possible
1510                          * modulation (dual stream with short guard interval),
1511                          * and it's working well, there's no need to look
1512                          * for a better type of modulation!
1513                          */
1514                         if (tbl->is_SGI) {
1515                                 s32 tpt = lq_sta->last_tpt / 100;
1516                                 if (tpt >= search_tbl->expected_tpt[index])
1517                                         break;
1518                         }
1519                         search_tbl->current_rate = rate_n_flags_from_tbl(
1520                                                 search_tbl, index, is_green);
1521                         lq_sta->search_better_tbl = 1;
1522                         goto out;
1523
1524                 }
1525                 tbl->action++;
1526                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1527                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1528
1529                 if (tbl->action == start_action)
1530                         break;
1531         }
1532
1533         return 0;
1534  out:
1535         tbl->action++;
1536         if (tbl->action > IWL_MIMO_SWITCH_GI)
1537                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1538         return 0;
1539
1540 }
1541
1542 /*
1543  * Check whether we should continue using same modulation mode, or
1544  * begin search for a new mode, based on:
1545  * 1) # tx successes or failures while using this mode
1546  * 2) # times calling this function
1547  * 3) elapsed time in this mode (not used, for now)
1548  */
1549 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta)
1550 {
1551         struct iwl_scale_tbl_info *tbl;
1552         int i;
1553         int active_tbl;
1554         int flush_interval_passed = 0;
1555         struct iwl_priv *priv;
1556
1557         priv = lq_sta->drv;
1558         active_tbl = lq_sta->active_tbl;
1559
1560         tbl = &(lq_sta->lq_info[active_tbl]);
1561
1562         /* If we've been disallowing search, see if we should now allow it */
1563         if (lq_sta->stay_in_tbl) {
1564
1565                 /* Elapsed time using current modulation mode */
1566                 if (lq_sta->flush_timer)
1567                         flush_interval_passed =
1568                             time_after(jiffies,
1569                                        (unsigned long)(lq_sta->flush_timer +
1570                                         IWL_RATE_SCALE_FLUSH_INTVL));
1571
1572                 /*
1573                  * Check if we should allow search for new modulation mode.
1574                  * If many frames have failed or succeeded, or we've used
1575                  * this same modulation for a long time, allow search, and
1576                  * reset history stats that keep track of whether we should
1577                  * allow a new search.  Also (below) reset all bitmaps and
1578                  * stats in active history.
1579                  */
1580                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1581                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1582                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1583                      && (flush_interval_passed))) {
1584                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1585                                      lq_sta->total_failed,
1586                                      lq_sta->total_success,
1587                                      flush_interval_passed);
1588
1589                         /* Allow search for new mode */
1590                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1591                         lq_sta->total_failed = 0;
1592                         lq_sta->total_success = 0;
1593                         lq_sta->flush_timer = 0;
1594
1595                 /*
1596                  * Else if we've used this modulation mode enough repetitions
1597                  * (regardless of elapsed time or success/failure), reset
1598                  * history bitmaps and rate-specific stats for all rates in
1599                  * active table.
1600                  */
1601                 } else {
1602                         lq_sta->table_count++;
1603                         if (lq_sta->table_count >=
1604                             lq_sta->table_count_limit) {
1605                                 lq_sta->table_count = 0;
1606
1607                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1608                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1609                                         rs_rate_scale_clear_window(
1610                                                 &(tbl->win[i]));
1611                         }
1612                 }
1613
1614                 /* If transitioning to allow "search", reset all history
1615                  * bitmaps and stats in active table (this will become the new
1616                  * "search" table). */
1617                 if (!lq_sta->stay_in_tbl) {
1618                         for (i = 0; i < IWL_RATE_COUNT; i++)
1619                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1620                 }
1621         }
1622 }
1623
1624 /*
1625  * Do rate scaling and search for new modulation mode.
1626  */
1627 static void rs_rate_scale_perform(struct iwl_priv *priv,
1628                                   struct net_device *dev,
1629                                   struct ieee80211_hdr *hdr,
1630                                   struct sta_info *sta)
1631 {
1632         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1633         struct ieee80211_hw *hw = local_to_hw(local);
1634         struct ieee80211_conf *conf = &hw->conf;
1635         int low = IWL_RATE_INVALID;
1636         int high = IWL_RATE_INVALID;
1637         int index;
1638         int i;
1639         struct iwl_rate_scale_data *window = NULL;
1640         int current_tpt = IWL_INVALID_VALUE;
1641         int low_tpt = IWL_INVALID_VALUE;
1642         int high_tpt = IWL_INVALID_VALUE;
1643         u32 fail_count;
1644         s8 scale_action = 0;
1645         __le16 fc;
1646         u16 rate_mask;
1647         u8 update_lq = 0;
1648         struct iwl_lq_sta *lq_sta;
1649         struct iwl_scale_tbl_info *tbl, *tbl1;
1650         u16 rate_scale_index_msk = 0;
1651         u32 rate;
1652         u8 is_green = 0;
1653         u8 active_tbl = 0;
1654         u8 done_search = 0;
1655         u16 high_low;
1656         s32 sr;
1657         u8 tid = MAX_TID_COUNT;
1658
1659         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1660
1661         fc = hdr->frame_control;
1662         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1663                 /* Send management frames and broadcast/multicast data using
1664                  * lowest rate. */
1665                 /* TODO: this could probably be improved.. */
1666                 return;
1667         }
1668
1669         if (!sta || !sta->rate_ctrl_priv)
1670                 return;
1671
1672         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
1673         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1674
1675         tid = rs_tl_add_packet(lq_sta, hdr);
1676
1677         /*
1678          * Select rate-scale / modulation-mode table to work with in
1679          * the rest of this function:  "search" if searching for better
1680          * modulation mode, or "active" if doing rate scaling within a mode.
1681          */
1682         if (!lq_sta->search_better_tbl)
1683                 active_tbl = lq_sta->active_tbl;
1684         else
1685                 active_tbl = 1 - lq_sta->active_tbl;
1686
1687         tbl = &(lq_sta->lq_info[active_tbl]);
1688         is_green = lq_sta->is_green;
1689
1690         /* current tx rate */
1691         index = sta->last_txrate_idx;
1692
1693         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1694                        tbl->lq_type);
1695
1696         /* rates available for this association, and for modulation mode */
1697         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1698
1699         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1700
1701         /* mask with station rate restriction */
1702         if (is_legacy(tbl->lq_type)) {
1703                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1704                         /* supp_rates has no CCK bits in A mode */
1705                         rate_scale_index_msk = (u16) (rate_mask &
1706                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1707                 else
1708                         rate_scale_index_msk = (u16) (rate_mask &
1709                                                       lq_sta->supp_rates);
1710
1711         } else
1712                 rate_scale_index_msk = rate_mask;
1713
1714         if (!rate_scale_index_msk)
1715                 rate_scale_index_msk = rate_mask;
1716
1717         if (!((1 << index) & rate_scale_index_msk)) {
1718                 IWL_ERROR("Current Rate is not valid\n");
1719                 return;
1720         }
1721
1722         /* Get expected throughput table and history window for current rate */
1723         if (!tbl->expected_tpt) {
1724                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1725                 return;
1726         }
1727
1728         window = &(tbl->win[index]);
1729
1730         /*
1731          * If there is not enough history to calculate actual average
1732          * throughput, keep analyzing results of more tx frames, without
1733          * changing rate or mode (bypass most of the rest of this function).
1734          * Set up new rate table in uCode only if old rate is not supported
1735          * in current association (use new rate found above).
1736          */
1737         fail_count = window->counter - window->success_counter;
1738         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1739                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1740                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1741                                "for index %d\n",
1742                                window->success_counter, window->counter, index);
1743
1744                 /* Can't calculate this yet; not enough history */
1745                 window->average_tpt = IWL_INVALID_VALUE;
1746
1747                 /* Should we stay with this modulation mode,
1748                  * or search for a new one? */
1749                 rs_stay_in_table(lq_sta);
1750
1751                 goto out;
1752
1753         /* Else we have enough samples; calculate estimate of
1754          * actual average throughput */
1755         } else {
1756                 /*FIXME:RS remove this else if we don't get this error*/
1757                 if (window->average_tpt != ((window->success_ratio *
1758                                 tbl->expected_tpt[index] + 64) / 128)) {
1759                         IWL_ERROR("expected_tpt should have been calculated"
1760                                                                 " by now\n");
1761                         window->average_tpt = ((window->success_ratio *
1762                                         tbl->expected_tpt[index] + 64) / 128);
1763                 }
1764         }
1765
1766         /* If we are searching for better modulation mode, check success. */
1767         if (lq_sta->search_better_tbl) {
1768
1769                 /* If good success, continue using the "search" mode;
1770                  * no need to send new link quality command, since we're
1771                  * continuing to use the setup that we've been trying. */
1772                 if (window->average_tpt > lq_sta->last_tpt) {
1773
1774                         IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1775                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1776                                         window->success_ratio,
1777                                         window->average_tpt,
1778                                         lq_sta->last_tpt);
1779
1780                         if (!is_legacy(tbl->lq_type))
1781                                 lq_sta->enable_counter = 1;
1782
1783                         /* Swap tables; "search" becomes "active" */
1784                         lq_sta->active_tbl = active_tbl;
1785                         current_tpt = window->average_tpt;
1786
1787                 /* Else poor success; go back to mode in "active" table */
1788                 } else {
1789
1790                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1791                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1792                                         window->success_ratio,
1793                                         window->average_tpt,
1794                                         lq_sta->last_tpt);
1795
1796                         /* Nullify "search" table */
1797                         tbl->lq_type = LQ_NONE;
1798
1799                         /* Revert to "active" table */
1800                         active_tbl = lq_sta->active_tbl;
1801                         tbl = &(lq_sta->lq_info[active_tbl]);
1802
1803                         /* Revert to "active" rate and throughput info */
1804                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1805                         current_tpt = lq_sta->last_tpt;
1806
1807                         /* Need to set up a new rate table in uCode */
1808                         update_lq = 1;
1809                 }
1810
1811                 /* Either way, we've made a decision; modulation mode
1812                  * search is done, allow rate adjustment next time. */
1813                 lq_sta->search_better_tbl = 0;
1814                 done_search = 1;        /* Don't switch modes below! */
1815                 goto lq_update;
1816         }
1817
1818         /* (Else) not in search of better modulation mode, try for better
1819          * starting rate, while staying in this mode. */
1820         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1821                                         tbl->lq_type);
1822         low = high_low & 0xff;
1823         high = (high_low >> 8) & 0xff;
1824
1825         sr = window->success_ratio;
1826
1827         /* Collect measured throughputs for current and adjacent rates */
1828         current_tpt = window->average_tpt;
1829         if (low != IWL_RATE_INVALID)
1830                 low_tpt = tbl->win[low].average_tpt;
1831         if (high != IWL_RATE_INVALID)
1832                 high_tpt = tbl->win[high].average_tpt;
1833
1834         scale_action = 0;
1835
1836         /* Too many failures, decrease rate */
1837         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1838                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1839                 scale_action = -1;
1840
1841         /* No throughput measured yet for adjacent rates; try increase. */
1842         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1843                    (high_tpt == IWL_INVALID_VALUE)) {
1844
1845                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1846                         scale_action = 1;
1847                 else if (low != IWL_RATE_INVALID)
1848                         scale_action = -1;
1849         }
1850
1851         /* Both adjacent throughputs are measured, but neither one has better
1852          * throughput; we're using the best rate, don't change it! */
1853         else if ((low_tpt != IWL_INVALID_VALUE) &&
1854                  (high_tpt != IWL_INVALID_VALUE) &&
1855                  (low_tpt < current_tpt) &&
1856                  (high_tpt < current_tpt))
1857                 scale_action = 0;
1858
1859         /* At least one adjacent rate's throughput is measured,
1860          * and may have better performance. */
1861         else {
1862                 /* Higher adjacent rate's throughput is measured */
1863                 if (high_tpt != IWL_INVALID_VALUE) {
1864                         /* Higher rate has better throughput */
1865                         if (high_tpt > current_tpt &&
1866                                         sr >= IWL_RATE_INCREASE_TH) {
1867                                 scale_action = 1;
1868                         } else {
1869                                 IWL_DEBUG_RATE
1870                                     ("decrease rate because of high tpt\n");
1871                                 scale_action = -1;
1872                         }
1873
1874                 /* Lower adjacent rate's throughput is measured */
1875                 } else if (low_tpt != IWL_INVALID_VALUE) {
1876                         /* Lower rate has better throughput */
1877                         if (low_tpt > current_tpt) {
1878                                 IWL_DEBUG_RATE
1879                                     ("decrease rate because of low tpt\n");
1880                                 scale_action = -1;
1881                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1882                                 scale_action = 1;
1883                         }
1884                 }
1885         }
1886
1887         /* Sanity check; asked for decrease, but success rate or throughput
1888          * has been good at old rate.  Don't change it. */
1889         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1890                     ((sr > IWL_RATE_HIGH_TH) ||
1891                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1892                 scale_action = 0;
1893
1894         switch (scale_action) {
1895         case -1:
1896                 /* Decrease starting rate, update uCode's rate table */
1897                 if (low != IWL_RATE_INVALID) {
1898                         update_lq = 1;
1899                         index = low;
1900                 }
1901                 break;
1902         case 1:
1903                 /* Increase starting rate, update uCode's rate table */
1904                 if (high != IWL_RATE_INVALID) {
1905                         update_lq = 1;
1906                         index = high;
1907                 }
1908
1909                 break;
1910         case 0:
1911                 /* No change */
1912         default:
1913                 break;
1914         }
1915
1916         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1917                     "high %d type %d\n",
1918                      index, scale_action, low, high, tbl->lq_type);
1919
1920 lq_update:
1921         /* Replace uCode's rate table for the destination station. */
1922         if (update_lq) {
1923                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1924                 rs_fill_link_cmd(priv, lq_sta, rate);
1925                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1926         }
1927
1928         /* Should we stay with this modulation mode, or search for a new one? */
1929         rs_stay_in_table(lq_sta);
1930
1931         /*
1932          * Search for new modulation mode if we're:
1933          * 1)  Not changing rates right now
1934          * 2)  Not just finishing up a search
1935          * 3)  Allowing a new search
1936          */
1937         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1938                 /* Save current throughput to compare with "search" throughput*/
1939                 lq_sta->last_tpt = current_tpt;
1940
1941                 /* Select a new "search" modulation mode to try.
1942                  * If one is found, set up the new "search" table. */
1943                 if (is_legacy(tbl->lq_type))
1944                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1945                 else if (is_siso(tbl->lq_type))
1946                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1947                 else
1948                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1949
1950                 /* If new "search" mode was selected, set up in uCode table */
1951                 if (lq_sta->search_better_tbl) {
1952                         /* Access the "search" table, clear its history. */
1953                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1954                         for (i = 0; i < IWL_RATE_COUNT; i++)
1955                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1956
1957                         /* Use new "search" start rate */
1958                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1959
1960                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1961                                      tbl->current_rate, index);
1962                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1963                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1964                 }
1965
1966                 /* If the "active" (non-search) mode was legacy,
1967                  * and we've tried switching antennas,
1968                  * but we haven't been able to try HT modes (not available),
1969                  * stay with best antenna legacy modulation for a while
1970                  * before next round of mode comparisons. */
1971                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1972                 if (is_legacy(tbl1->lq_type) &&
1973                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1974                     (lq_sta->action_counter >= 1)) {
1975                         lq_sta->action_counter = 0;
1976                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1977                         rs_set_stay_in_table(priv, 1, lq_sta);
1978                 }
1979
1980                 /* If we're in an HT mode, and all 3 mode switch actions
1981                  * have been tried and compared, stay in this best modulation
1982                  * mode for a while before next round of mode comparisons. */
1983                 if (lq_sta->enable_counter &&
1984                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1985                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1986                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1987                             (tid != MAX_TID_COUNT)) {
1988                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
1989                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
1990                         }
1991                         lq_sta->action_counter = 0;
1992                         rs_set_stay_in_table(priv, 0, lq_sta);
1993                 }
1994
1995         /*
1996          * Else, don't search for a new modulation mode.
1997          * Put new timestamp in stay-in-modulation-mode flush timer if:
1998          * 1)  Not changing rates right now
1999          * 2)  Not just finishing up a search
2000          * 3)  flush timer is empty
2001          */
2002         } else {
2003                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2004                         lq_sta->flush_timer = jiffies;
2005         }
2006
2007 out:
2008         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2009         i = index;
2010         sta->last_txrate_idx = i;
2011
2012         /* sta->txrate_idx is an index to A mode rates which start
2013          * at IWL_FIRST_OFDM_RATE
2014          */
2015         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2016                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2017         else
2018                 sta->txrate_idx = i;
2019
2020         return;
2021 }
2022
2023
2024 static void rs_initialize_lq(struct iwl_priv *priv,
2025                              struct ieee80211_conf *conf,
2026                              struct sta_info *sta)
2027 {
2028         struct iwl_lq_sta *lq_sta;
2029         struct iwl_scale_tbl_info *tbl;
2030         int rate_idx;
2031         int i;
2032         u32 rate;
2033         u8 use_green = rs_use_green(priv, conf);
2034         u8 active_tbl = 0;
2035         u8 valid_tx_ant;
2036
2037         if (!sta || !sta->rate_ctrl_priv)
2038                 goto out;
2039
2040         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2041         i = sta->last_txrate_idx;
2042
2043         if ((lq_sta->lq.sta_id == 0xff) &&
2044             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2045                 goto out;
2046
2047         valid_tx_ant = priv->hw_params.valid_tx_ant;
2048
2049         if (!lq_sta->search_better_tbl)
2050                 active_tbl = lq_sta->active_tbl;
2051         else
2052                 active_tbl = 1 - lq_sta->active_tbl;
2053
2054         tbl = &(lq_sta->lq_info[active_tbl]);
2055
2056         if ((i < 0) || (i >= IWL_RATE_COUNT))
2057                 i = 0;
2058
2059         /* FIXME:RS: This is also wrong in 4965 */
2060         rate = iwl_rates[i].plcp;
2061         rate |= RATE_MCS_ANT_B_MSK;
2062         rate &= ~RATE_MCS_ANT_A_MSK;
2063
2064         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2065                 rate |= RATE_MCS_CCK_MSK;
2066
2067         tbl->ant_type = ANT_B;
2068         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2069         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2070             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2071
2072         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2073         tbl->current_rate = rate;
2074         rs_set_expected_tpt_table(lq_sta, tbl);
2075         rs_fill_link_cmd(NULL, lq_sta, rate);
2076         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2077  out:
2078         return;
2079 }
2080
2081 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2082                         struct ieee80211_supported_band *sband,
2083                         struct sk_buff *skb,
2084                         struct rate_selection *sel)
2085 {
2086
2087         int i;
2088         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2089         struct ieee80211_conf *conf = &local->hw.conf;
2090         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2091         struct sta_info *sta;
2092         __le16 fc;
2093         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2094         struct iwl_lq_sta *lq_sta;
2095
2096         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2097
2098         rcu_read_lock();
2099
2100         sta = sta_info_get(local, hdr->addr1);
2101
2102         /* Send management frames and broadcast/multicast data using lowest
2103          * rate. */
2104         fc = hdr->frame_control;
2105         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2106             !sta || !sta->rate_ctrl_priv) {
2107                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2108                 goto out;
2109         }
2110
2111         lq_sta = (struct iwl_lq_sta *)sta->rate_ctrl_priv;
2112         i = sta->last_txrate_idx;
2113
2114         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2115             !lq_sta->ibss_sta_added) {
2116                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2117                 DECLARE_MAC_BUF(mac);
2118
2119                 if (sta_id == IWL_INVALID_STATION) {
2120                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2121                                        print_mac(mac, hdr->addr1));
2122                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2123                                                         0, CMD_ASYNC, NULL);
2124                 }
2125                 if ((sta_id != IWL_INVALID_STATION)) {
2126                         lq_sta->lq.sta_id = sta_id;
2127                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2128                         lq_sta->ibss_sta_added = 1;
2129                         rs_initialize_lq(priv, conf, sta);
2130                 }
2131         }
2132
2133         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2134                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2135                 goto out;
2136         }
2137
2138         if (sband->band == IEEE80211_BAND_5GHZ)
2139                 i -= IWL_FIRST_OFDM_RATE;
2140         sel->rate_idx = i;
2141 out:
2142         rcu_read_unlock();
2143 }
2144
2145 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2146 {
2147         struct iwl_lq_sta *lq_sta;
2148         struct iwl_priv *priv;
2149         int i, j;
2150
2151         priv = (struct iwl_priv *)priv_rate;
2152         IWL_DEBUG_RATE("create station rate scale window\n");
2153
2154         lq_sta = kzalloc(sizeof(struct iwl_lq_sta), gfp);
2155
2156         if (lq_sta == NULL)
2157                 return NULL;
2158         lq_sta->lq.sta_id = 0xff;
2159
2160
2161         for (j = 0; j < LQ_SIZE; j++)
2162                 for (i = 0; i < IWL_RATE_COUNT; i++)
2163                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2164
2165         return lq_sta;
2166 }
2167
2168 static void rs_rate_init(void *priv_rate, void *priv_sta,
2169                          struct ieee80211_local *local,
2170                          struct sta_info *sta)
2171 {
2172         int i, j;
2173         struct ieee80211_conf *conf = &local->hw.conf;
2174         struct ieee80211_supported_band *sband;
2175         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2176         struct iwl_lq_sta *lq_sta = priv_sta;
2177
2178         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2179
2180         lq_sta->flush_timer = 0;
2181         lq_sta->supp_rates = sta->supp_rates[sband->band];
2182         sta->txrate_idx = 3;
2183         for (j = 0; j < LQ_SIZE; j++)
2184                 for (i = 0; i < IWL_RATE_COUNT; i++)
2185                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2186
2187         IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2188         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2189          * the lowest or the highest rate.. Could consider using RSSI from
2190          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2191          * after assoc.. */
2192
2193         lq_sta->ibss_sta_added = 0;
2194         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2195                 u8 sta_id = iwl_find_station(priv, sta->addr);
2196                 DECLARE_MAC_BUF(mac);
2197
2198                 /* for IBSS the call are from tasklet */
2199                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2200                              print_mac(mac, sta->addr));
2201
2202                 if (sta_id == IWL_INVALID_STATION) {
2203                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2204                                        print_mac(mac, sta->addr));
2205                         sta_id = iwl_add_station_flags(priv, sta->addr,
2206                                                         0, CMD_ASYNC, NULL);
2207                 }
2208                 if ((sta_id != IWL_INVALID_STATION)) {
2209                         lq_sta->lq.sta_id = sta_id;
2210                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2211                 }
2212                 /* FIXME: this is w/a remove it later */
2213                 priv->assoc_station_added = 1;
2214         }
2215
2216         /* Find highest tx rate supported by hardware and destination station */
2217         for (i = 0; i < sband->n_bitrates; i++)
2218                 if (sta->supp_rates[sband->band] & BIT(i))
2219                         sta->txrate_idx = i;
2220
2221         sta->last_txrate_idx = sta->txrate_idx;
2222         /* For MODE_IEEE80211A, skip over cck rates in global rate table */
2223         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2224                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2225
2226         lq_sta->is_dup = 0;
2227         lq_sta->is_green = rs_use_green(priv, conf);
2228         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2229         lq_sta->active_rate_basic = priv->active_rate_basic;
2230         lq_sta->band = priv->band;
2231         /*
2232          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2233          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2234          */
2235         lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2236         lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2237         lq_sta->active_siso_rate &= ~((u16)0x2);
2238         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2239
2240         /* Same here */
2241         lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2242         lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2243         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2244         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2245
2246         lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2247         lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2248         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2249         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2250
2251         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2252                      lq_sta->active_siso_rate,
2253                      lq_sta->active_mimo2_rate,
2254                      lq_sta->active_mimo3_rate);
2255
2256         /* These values will be overriden later */
2257         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2258         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2259
2260         /* as default allow aggregation for all tids */
2261         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2262         lq_sta->drv = priv;
2263
2264         rs_initialize_lq(priv, conf, sta);
2265 }
2266
2267 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2268                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2269 {
2270         struct iwl_scale_tbl_info tbl_type;
2271         int index = 0;
2272         int rate_idx;
2273         int repeat_rate = 0;
2274         u8 ant_toggle_cnt = 0;
2275         u8 use_ht_possible = 1;
2276         u8 valid_tx_ant = 0;
2277         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2278
2279         /* Override starting rate (index 0) if needed for debug purposes */
2280         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2281
2282         /* Interpret new_rate (rate_n_flags) */
2283         memset(&tbl_type, 0, sizeof(tbl_type));
2284         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2285                                   &tbl_type, &rate_idx);
2286
2287         /* How many times should we repeat the initial rate? */
2288         if (is_legacy(tbl_type.lq_type)) {
2289                 ant_toggle_cnt = 1;
2290                 repeat_rate = IWL_NUMBER_TRY;
2291         } else {
2292                 repeat_rate = IWL_HT_NUMBER_TRY;
2293         }
2294
2295         lq_cmd->general_params.mimo_delimiter =
2296                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2297
2298         /* Fill 1st table entry (index 0) */
2299         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2300
2301         if (num_of_ant(tbl_type.ant_type) == 1) {
2302                 lq_cmd->general_params.single_stream_ant_msk =
2303                                                 tbl_type.ant_type;
2304         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2305                 lq_cmd->general_params.dual_stream_ant_msk =
2306                                                 tbl_type.ant_type;
2307         } /* otherwise we don't modify the existing value */
2308
2309         index++;
2310         repeat_rate--;
2311
2312         if (priv)
2313                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2314
2315         /* Fill rest of rate table */
2316         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2317                 /* Repeat initial/next rate.
2318                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2319                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2320                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2321                         if (is_legacy(tbl_type.lq_type)) {
2322                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2323                                         ant_toggle_cnt++;
2324                                 else if (priv &&
2325                                          rs_toggle_antenna(valid_tx_ant,
2326                                                         &new_rate, &tbl_type))
2327                                         ant_toggle_cnt = 1;
2328 }
2329
2330                         /* Override next rate if needed for debug purposes */
2331                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2332
2333                         /* Fill next table entry */
2334                         lq_cmd->rs_table[index].rate_n_flags =
2335                                         cpu_to_le32(new_rate);
2336                         repeat_rate--;
2337                         index++;
2338                 }
2339
2340                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2341                                                 &rate_idx);
2342
2343                 /* Indicate to uCode which entries might be MIMO.
2344                  * If initial rate was MIMO, this will finally end up
2345                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2346                 if (is_mimo(tbl_type.lq_type))
2347                         lq_cmd->general_params.mimo_delimiter = index;
2348
2349                 /* Get next rate */
2350                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2351                                              use_ht_possible);
2352
2353                 /* How many times should we repeat the next rate? */
2354                 if (is_legacy(tbl_type.lq_type)) {
2355                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2356                                 ant_toggle_cnt++;
2357                         else if (priv &&
2358                                  rs_toggle_antenna(valid_tx_ant,
2359                                                    &new_rate, &tbl_type))
2360                                 ant_toggle_cnt = 1;
2361
2362                         repeat_rate = IWL_NUMBER_TRY;
2363                 } else {
2364                         repeat_rate = IWL_HT_NUMBER_TRY;
2365                 }
2366
2367                 /* Don't allow HT rates after next pass.
2368                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2369                 use_ht_possible = 0;
2370
2371                 /* Override next rate if needed for debug purposes */
2372                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2373
2374                 /* Fill next table entry */
2375                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2376
2377                 index++;
2378                 repeat_rate--;
2379         }
2380
2381         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2382         lq_cmd->agg_params.agg_dis_start_th = 3;
2383         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2384 }
2385
2386 static void *rs_alloc(struct ieee80211_local *local)
2387 {
2388         return local->hw.priv;
2389 }
2390 /* rate scale requires free function to be implemented */
2391 static void rs_free(void *priv_rate)
2392 {
2393         return;
2394 }
2395
2396 static void rs_clear(void *priv_rate)
2397 {
2398 #ifdef CONFIG_IWLWIFI_DEBUG
2399         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2400
2401         IWL_DEBUG_RATE("enter\n");
2402
2403         /* TODO - add rate scale state reset */
2404
2405         IWL_DEBUG_RATE("leave\n");
2406 #endif /* CONFIG_IWLWIFI_DEBUG */
2407 }
2408
2409 static void rs_free_sta(void *priv_rate, void *priv_sta)
2410 {
2411         struct iwl_lq_sta *lq_sta = priv_sta;
2412         struct iwl_priv *priv;
2413
2414         priv = (struct iwl_priv *)priv_rate;
2415         IWL_DEBUG_RATE("enter\n");
2416         kfree(lq_sta);
2417         IWL_DEBUG_RATE("leave\n");
2418 }
2419
2420
2421 #ifdef CONFIG_MAC80211_DEBUGFS
2422 static int open_file_generic(struct inode *inode, struct file *file)
2423 {
2424         file->private_data = inode->i_private;
2425         return 0;
2426 }
2427 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2428                              u32 *rate_n_flags, int index)
2429 {
2430         struct iwl_priv *priv;
2431
2432         priv = lq_sta->drv;
2433         if (lq_sta->dbg_fixed_rate) {
2434                 if (index < 12) {
2435                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2436                 } else {
2437                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2438                                 *rate_n_flags = 0x800D;
2439                         else
2440                                 *rate_n_flags = 0x820A;
2441                 }
2442                 IWL_DEBUG_RATE("Fixed rate ON\n");
2443         } else {
2444                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2445         }
2446 }
2447
2448 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2449                         const char __user *user_buf, size_t count, loff_t *ppos)
2450 {
2451         struct iwl_lq_sta *lq_sta = file->private_data;
2452         struct iwl_priv *priv;
2453         char buf[64];
2454         int buf_size;
2455         u32 parsed_rate;
2456
2457         priv = lq_sta->drv;
2458         memset(buf, 0, sizeof(buf));
2459         buf_size = min(count, sizeof(buf) -  1);
2460         if (copy_from_user(buf, user_buf, buf_size))
2461                 return -EFAULT;
2462
2463         if (sscanf(buf, "%x", &parsed_rate) == 1)
2464                 lq_sta->dbg_fixed_rate = parsed_rate;
2465         else
2466                 lq_sta->dbg_fixed_rate = 0;
2467
2468         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2469         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2470         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2471         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2472
2473         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2474                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2475
2476         if (lq_sta->dbg_fixed_rate) {
2477                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2478                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2479         }
2480
2481         return count;
2482 }
2483
2484 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2485                         char __user *user_buf, size_t count, loff_t *ppos)
2486 {
2487         char buff[1024];
2488         int desc = 0;
2489         int i = 0;
2490
2491         struct iwl_lq_sta *lq_sta = file->private_data;
2492
2493         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2494         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2495                         lq_sta->total_failed, lq_sta->total_success,
2496                         lq_sta->active_legacy_rate);
2497         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2498                         lq_sta->dbg_fixed_rate);
2499         desc += sprintf(buff+desc, "general:"
2500                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2501                 lq_sta->lq.general_params.flags,
2502                 lq_sta->lq.general_params.mimo_delimiter,
2503                 lq_sta->lq.general_params.single_stream_ant_msk,
2504                 lq_sta->lq.general_params.dual_stream_ant_msk);
2505
2506         desc += sprintf(buff+desc, "agg:"
2507                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2508                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2509                         lq_sta->lq.agg_params.agg_dis_start_th,
2510                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2511
2512         desc += sprintf(buff+desc,
2513                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2514                         lq_sta->lq.general_params.start_rate_index[0],
2515                         lq_sta->lq.general_params.start_rate_index[1],
2516                         lq_sta->lq.general_params.start_rate_index[2],
2517                         lq_sta->lq.general_params.start_rate_index[3]);
2518
2519
2520         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2521                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2522                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2523
2524         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2525 }
2526
2527 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2528         .write = rs_sta_dbgfs_scale_table_write,
2529         .read = rs_sta_dbgfs_scale_table_read,
2530         .open = open_file_generic,
2531 };
2532 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2533                         char __user *user_buf, size_t count, loff_t *ppos)
2534 {
2535         char buff[1024];
2536         int desc = 0;
2537         int i, j;
2538
2539         struct iwl_lq_sta *lq_sta = file->private_data;
2540         for (i = 0; i < LQ_SIZE; i++) {
2541                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2542                                 "rate=0x%X\n",
2543                                 lq_sta->active_tbl == i?"*":"x",
2544                                 lq_sta->lq_info[i].lq_type,
2545                                 lq_sta->lq_info[i].is_SGI,
2546                                 lq_sta->lq_info[i].is_fat,
2547                                 lq_sta->lq_info[i].is_dup,
2548                                 lq_sta->lq_info[i].current_rate);
2549                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2550                         desc += sprintf(buff+desc,
2551                                 "counter=%d success=%d %%=%d\n",
2552                                 lq_sta->lq_info[i].win[j].counter,
2553                                 lq_sta->lq_info[i].win[j].success_counter,
2554                                 lq_sta->lq_info[i].win[j].success_ratio);
2555                 }
2556         }
2557         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2558 }
2559
2560 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2561         .read = rs_sta_dbgfs_stats_table_read,
2562         .open = open_file_generic,
2563 };
2564
2565 static void rs_add_debugfs(void *priv, void *priv_sta,
2566                                         struct dentry *dir)
2567 {
2568         struct iwl_lq_sta *lq_sta = priv_sta;
2569         lq_sta->rs_sta_dbgfs_scale_table_file =
2570                 debugfs_create_file("rate_scale_table", 0600, dir,
2571                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2572         lq_sta->rs_sta_dbgfs_stats_table_file =
2573                 debugfs_create_file("rate_stats_table", 0600, dir,
2574                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2575         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2576                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2577                 &lq_sta->tx_agg_tid_en);
2578
2579 }
2580
2581 static void rs_remove_debugfs(void *priv, void *priv_sta)
2582 {
2583         struct iwl_lq_sta *lq_sta = priv_sta;
2584         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2585         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2586         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2587 }
2588 #endif
2589
2590 static struct rate_control_ops rs_ops = {
2591         .module = NULL,
2592         .name = RS_NAME,
2593         .tx_status = rs_tx_status,
2594         .get_rate = rs_get_rate,
2595         .rate_init = rs_rate_init,
2596         .clear = rs_clear,
2597         .alloc = rs_alloc,
2598         .free = rs_free,
2599         .alloc_sta = rs_alloc_sta,
2600         .free_sta = rs_free_sta,
2601 #ifdef CONFIG_MAC80211_DEBUGFS
2602         .add_sta_debugfs = rs_add_debugfs,
2603         .remove_sta_debugfs = rs_remove_debugfs,
2604 #endif
2605 };
2606
2607 int iwlagn_rate_control_register(void)
2608 {
2609         return ieee80211_rate_control_register(&rs_ops);
2610 }
2611
2612 void iwlagn_rate_control_unregister(void)
2613 {
2614         ieee80211_rate_control_unregister(&rs_ops);
2615 }
2616