drivers/net/wireless/iwlwifi/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/wireless.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37
  38 #include "../net/mac80211/rate.h"
  39
  40 #include "iwl-dev.h"
  41 #include "iwl-core.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 static const u8 ant_toggle_lookup[] = {
  68         /*ANT_NONE -> */ ANT_NONE,
  69         /*ANT_A    -> */ ANT_B,
  70         /*ANT_B    -> */ ANT_C,
  71         /*ANT_AB   -> */ ANT_BC,
  72         /*ANT_C    -> */ ANT_A,
  73         /*ANT_AC   -> */ ANT_AB,
  74         /*ANT_BC   -> */ ANT_AC,
  75         /*ANT_ABC  -> */ ANT_ABC,
  76 };
  77
  78 /**
  79  * struct iwl4965_rate_scale_data -- tx success history for one rate
  80  */
  81 struct iwl4965_rate_scale_data {
  82         u64 data;               /* bitmap of successful frames */
  83         s32 success_counter;    /* number of frames successful */
  84         s32 success_ratio;      /* per-cent * 128  */
  85         s32 counter;            /* number of frames attempted */
  86         s32 average_tpt;        /* success ratio * expected throughput */
  87         unsigned long stamp;
  88 };
  89
  90 /**
  91  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  92  *
  93  * There are two of these in struct iwl4965_lq_sta,
  94  * one for "active", and one for "search".
  95  */
  96 struct iwl4965_scale_tbl_info {
  97         enum iwl_table_type lq_type;
  98         u8 ant_type;
  99         u8 is_SGI;      /* 1 = short guard interval */
 100         u8 is_fat;      /* 1 = 40 MHz channel width */
 101         u8 is_dup;      /* 1 = duplicated data streams */
 102         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
 103         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
 104         u32 current_rate;  /* rate_n_flags, uCode API format */
 105         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
 106 };
 107
 108 struct iwl4965_traffic_load {
 109         unsigned long time_stamp;       /* age of the oldest statistics */
 110         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 111                                                  * slice */
 112         u32 total;                      /* total num of packets during the
 113                                          * last TID_MAX_TIME_DIFF */
 114         u8 queue_count;                 /* number of queues that has
 115                                          * been used since the last cleanup */
 116         u8 head;                        /* start of the circular buffer */
 117 };
 118
 119 /**
 120  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 121  *
 122  * Pointer to this gets passed back and forth between driver and mac80211.
 123  */
 124 struct iwl4965_lq_sta {
 125         u8 active_tbl;          /* index of active table, range 0-1 */
 126         u8 enable_counter;      /* indicates HT mode */
 127         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 128         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 129         s32 last_tpt;
 130
 131         /* The following determine when to search for a new mode */
 132         u32 table_count_limit;
 133         u32 max_failure_limit;  /* # failed frames before new search */
 134         u32 max_success_limit;  /* # successful frames before new search */
 135         u32 table_count;
 136         u32 total_failed;       /* total failed frames, any/all rates */
 137         u32 total_success;      /* total successful frames, any/all rates */
 138         u32 flush_timer;        /* time staying in mode before new search */
 139
 140         u8 action_counter;      /* # mode-switch actions tried */
 141         u8 is_green;
 142         u8 is_dup;
 143         enum ieee80211_band band;
 144         u8 ibss_sta_added;
 145
 146         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 147         u32 supp_rates;
 148         u16 active_legacy_rate;
 149         u16 active_siso_rate;
 150         u16 active_mimo2_rate;
 151         u16 active_mimo3_rate;
 152         u16 active_rate_basic;
 153
 154         struct iwl_link_quality_cmd lq;
 155         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 156         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 157         u8 tx_agg_tid_en;
 158 #ifdef CONFIG_MAC80211_DEBUGFS
 159         struct dentry *rs_sta_dbgfs_scale_table_file;
 160         struct dentry *rs_sta_dbgfs_stats_table_file;
 161         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 162         u32 dbg_fixed_rate;
 163 #endif
 164         struct iwl_priv *drv;
 165 };
 166
 167 static void rs_rate_scale_perform(struct iwl_priv *priv,
 168                                    struct net_device *dev,
 169                                    struct ieee80211_hdr *hdr,
 170                                    struct sta_info *sta);
 171 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 172                              struct iwl4965_lq_sta *lq_sta,
 173                              u32 rate_n_flags);
 174
 175
 176 #ifdef CONFIG_MAC80211_DEBUGFS
 177 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 178                                         u32 *rate_n_flags, int index);
 179 #else
 180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 181                                         u32 *rate_n_flags, int index)
 182 {}
 183 #endif
 184
 185 /*
 186  * Expected throughput metrics for following rates:
 187  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 188  * "G" is the only table that supports CCK (the first 4 rates).
 189  */
 190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 192         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 193 };
 194
 195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 196         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 197 };
 198
 199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 201 };
 202
 203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 204         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 205 };
 206
 207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 209 };
 210
 211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 213 };
 214
 215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 217 };
 218
 219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 221 };
 222
 223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 225 };
 226
 227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 229 };
 230
 231 static inline u8 rs_extract_rate(u32 rate_n_flags)
 232 {
 233         return (u8)(rate_n_flags & 0xFF);
 234 }
 235
 236 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 237 {
 238         window->data = 0;
 239         window->success_counter = 0;
 240         window->success_ratio = IWL_INVALID_VALUE;
 241         window->counter = 0;
 242         window->average_tpt = IWL_INVALID_VALUE;
 243         window->stamp = 0;
 244 }
 245
 246 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 iwl4965_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 iwl4965_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 iwl4965_traffic_load *tl = NULL;
 283         u16 fc = le16_to_cpu(hdr->frame_control);
 284         u8 tid;
 285
 286         if (ieee80211_is_qos_data(fc)) {
 287                 u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
 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 iwl4965_lq_sta *lq_data, u8 tid)
 328 {
 329         u32 curr_time = jiffies_to_msecs(jiffies);
 330         u32 time_diff;
 331         s32 index;
 332         struct iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_rate_scale_data *windows,
 400                               int scale_index, s32 tpt, int retries,
 401                               int successes)
 402 {
 403         struct iwl4965_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 iwl4965_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 iwl4965_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 = iwl4965_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 iwl4965_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 iwl4965_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 iwl4965_lq_sta *lq_sta,
 717                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 718                              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 iwl4965_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 iwl4965_rate_scale_data *window = NULL;
 791         struct iwl4965_rate_scale_data *search_win = NULL;
 792         u32 tx_rate;
 793         struct iwl4965_scale_tbl_info tbl_type;
 794         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 795         u8 active_index = 0;
 796         u16 fc = le16_to_cpu(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 iwl4965_lq_sta *)sta->rate_ctrl_priv;
 823
 824         if (!priv->lq_mngr.lq_ready)
 825                 goto out;
 826
 827         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 828             !lq_sta->ibss_sta_added)
 829                 goto out;
 830
 831         table = &lq_sta->lq;
 832         active_index = lq_sta->active_tbl;
 833
 834         curr_tbl = &(lq_sta->lq_info[active_index]);
 835         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 836         window = (struct iwl4965_rate_scale_data *)
 837             &(curr_tbl->win[0]);
 838         search_win = (struct iwl4965_rate_scale_data *)
 839             &(search_tbl->win[0]);
 840
 841         /*
 842          * Ignore this Tx frame response if its initial rate doesn't match
 843          * that of latest Link Quality command.  There may be stragglers
 844          * from a previous Link Quality command, but we're no longer interested
 845          * in those; they're either from the "active" mode while we're trying
 846          * to check "search" mode, or a prior "search" mode after we've moved
 847          * to a new "search" mode (which might become the new "active" mode).
 848          */
 849         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 850         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 851         if (priv->band == IEEE80211_BAND_5GHZ)
 852                 rs_index -= IWL_FIRST_OFDM_RATE;
 853
 854         if ((info->tx_rate_idx < 0) ||
 855             (tbl_type.is_SGI ^
 856                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 857             (tbl_type.is_fat ^
 858                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 859             (tbl_type.is_dup ^
 860                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 861             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 862             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 863                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 864             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 865                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 866             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 867              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 868                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 869                 goto out;
 870         }
 871
 872         /* Update frame history window with "failure" for each Tx retry. */
 873         while (retries) {
 874                 /* Look up the rate and other info used for each tx attempt.
 875                  * Each tx attempt steps one entry deeper in the rate table. */
 876                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 877                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 878                                           &tbl_type, &rs_index);
 879
 880                 /* If type matches "search" table,
 881                  * add failure to "search" history */
 882                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 883                     (tbl_type.ant_type == search_tbl->ant_type) &&
 884                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 885                         if (search_tbl->expected_tpt)
 886                                 tpt = search_tbl->expected_tpt[rs_index];
 887                         else
 888                                 tpt = 0;
 889                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 890
 891                 /* Else if type matches "current/active" table,
 892                  * add failure to "current/active" history */
 893                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 894                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 895                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 896                         if (curr_tbl->expected_tpt)
 897                                 tpt = curr_tbl->expected_tpt[rs_index];
 898                         else
 899                                 tpt = 0;
 900                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 901                 }
 902
 903                 /* If not searching for a new mode, increment failed counter
 904                  * ... this helps determine when to start searching again */
 905                 if (lq_sta->stay_in_tbl)
 906                         lq_sta->total_failed++;
 907                 --retries;
 908                 index++;
 909
 910         }
 911
 912         /*
 913          * Find (by rate) the history window to update with final Tx attempt;
 914          * if Tx was successful first try, use original rate,
 915          * else look up the rate that was, finally, successful.
 916          */
 917         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 918         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 919
 920         /* Update frame history window with "success" if Tx got ACKed ... */
 921         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 922
 923         /* If type matches "search" table,
 924          * add final tx status to "search" history */
 925         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 926             (tbl_type.ant_type == search_tbl->ant_type) &&
 927             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 928                 if (search_tbl->expected_tpt)
 929                         tpt = search_tbl->expected_tpt[rs_index];
 930                 else
 931                         tpt = 0;
 932                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 933                         rs_collect_tx_data(search_win, rs_index, tpt,
 934                                            info->status.ampdu_ack_len,
 935                                            info->status.ampdu_ack_map);
 936                 else
 937                         rs_collect_tx_data(search_win, rs_index, tpt,
 938                                            1, status);
 939         /* Else if type matches "current/active" table,
 940          * add final tx status to "current/active" history */
 941         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 942                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 943                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 944                 if (curr_tbl->expected_tpt)
 945                         tpt = curr_tbl->expected_tpt[rs_index];
 946                 else
 947                         tpt = 0;
 948                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 949                         rs_collect_tx_data(window, rs_index, tpt,
 950                                            info->status.ampdu_ack_len,
 951                                            info->status.ampdu_ack_map);
 952                 else
 953                         rs_collect_tx_data(window, rs_index, tpt,
 954                                            1, status);
 955         }
 956
 957         /* If not searching for new mode, increment success/failed counter
 958          * ... these help determine when to start searching again */
 959         if (lq_sta->stay_in_tbl) {
 960                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 961                         lq_sta->total_success += info->status.ampdu_ack_map;
 962                         lq_sta->total_failed +=
 963                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 964                 } else {
 965                         if (status)
 966                                 lq_sta->total_success++;
 967                         else
 968                                 lq_sta->total_failed++;
 969                 }
 970         }
 971
 972         /* See if there's a better rate or modulation mode to try. */
 973         rs_rate_scale_perform(priv, dev, hdr, sta);
 974 out:
 975         rcu_read_unlock();
 976         return;
 977 }
 978
 979 /*
 980  * Begin a period of staying with a selected modulation mode.
 981  * Set "stay_in_tbl" flag to prevent any mode switches.
 982  * Set frame tx success limits according to legacy vs. high-throughput,
 983  * and reset overall (spanning all rates) tx success history statistics.
 984  * These control how long we stay using same modulation mode before
 985  * searching for a new mode.
 986  */
 987 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 988                                  struct iwl4965_lq_sta *lq_sta)
 989 {
 990         IWL_DEBUG_RATE("we are staying in the same table\n");
 991         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 992         if (is_legacy) {
 993                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 994                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 995                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 996         } else {
 997                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 998                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 999                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1000         }
1001         lq_sta->table_count = 0;
1002         lq_sta->total_failed = 0;
1003         lq_sta->total_success = 0;
1004 }
1005
1006 /*
1007  * Find correct throughput table for given mode of modulation
1008  */
1009 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1010                                       struct iwl4965_scale_tbl_info *tbl)
1011 {
1012         if (is_legacy(tbl->lq_type)) {
1013                 if (!is_a_band(tbl->lq_type))
1014                         tbl->expected_tpt = expected_tpt_G;
1015                 else
1016                         tbl->expected_tpt = expected_tpt_A;
1017         } else if (is_siso(tbl->lq_type)) {
1018                 if (tbl->is_fat && !lq_sta->is_dup)
1019                         if (tbl->is_SGI)
1020                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1021                         else
1022                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1023                 else if (tbl->is_SGI)
1024                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1025                 else
1026                         tbl->expected_tpt = expected_tpt_siso20MHz;
1027
1028         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1029                 if (tbl->is_fat && !lq_sta->is_dup)
1030                         if (tbl->is_SGI)
1031                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1032                         else
1033                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1034                 else if (tbl->is_SGI)
1035                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1036                 else
1037                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1038         } else
1039                 tbl->expected_tpt = expected_tpt_G;
1040 }
1041
1042 /*
1043  * Find starting rate for new "search" high-throughput mode of modulation.
1044  * Goal is to find lowest expected rate (under perfect conditions) that is
1045  * above the current measured throughput of "active" mode, to give new mode
1046  * a fair chance to prove itself without too many challenges.
1047  *
1048  * This gets called when transitioning to more aggressive modulation
1049  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1050  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1051  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1052  * bit rate will typically need to increase, but not if performance was bad.
1053  */
1054 static s32 rs_get_best_rate(struct iwl_priv *priv,
1055                             struct iwl4965_lq_sta *lq_sta,
1056                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1057                             u16 rate_mask, s8 index)
1058 {
1059         /* "active" values */
1060         struct iwl4965_scale_tbl_info *active_tbl =
1061             &(lq_sta->lq_info[lq_sta->active_tbl]);
1062         s32 active_sr = active_tbl->win[index].success_ratio;
1063         s32 active_tpt = active_tbl->expected_tpt[index];
1064
1065         /* expected "search" throughput */
1066         s32 *tpt_tbl = tbl->expected_tpt;
1067
1068         s32 new_rate, high, low, start_hi;
1069         u16 high_low;
1070         s8 rate = index;
1071
1072         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1073
1074         for (; ;) {
1075                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1076                                                 tbl->lq_type);
1077
1078                 low = high_low & 0xff;
1079                 high = (high_low >> 8) & 0xff;
1080
1081                 /*
1082                  * Lower the "search" bit rate, to give new "search" mode
1083                  * approximately the same throughput as "active" if:
1084                  *
1085                  * 1) "Active" mode has been working modestly well (but not
1086                  *    great), and expected "search" throughput (under perfect
1087                  *    conditions) at candidate rate is above the actual
1088                  *    measured "active" throughput (but less than expected
1089                  *    "active" throughput under perfect conditions).
1090                  * OR
1091                  * 2) "Active" mode has been working perfectly or very well
1092                  *    and expected "search" throughput (under perfect
1093                  *    conditions) at candidate rate is above expected
1094                  *    "active" throughput (under perfect conditions).
1095                  */
1096                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1097                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1098                       (active_sr <= IWL_RATE_HIGH_TH) &&
1099                       (tpt_tbl[rate] <= active_tpt))) ||
1100                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1101                      (tpt_tbl[rate] > active_tpt))) {
1102
1103                         /* (2nd or later pass)
1104                          * If we've already tried to raise the rate, and are
1105                          * now trying to lower it, use the higher rate. */
1106                         if (start_hi != IWL_RATE_INVALID) {
1107                                 new_rate = start_hi;
1108                                 break;
1109                         }
1110
1111                         new_rate = rate;
1112
1113                         /* Loop again with lower rate */
1114                         if (low != IWL_RATE_INVALID)
1115                                 rate = low;
1116
1117                         /* Lower rate not available, use the original */
1118                         else
1119                                 break;
1120
1121                 /* Else try to raise the "search" rate to match "active" */
1122                 } else {
1123                         /* (2nd or later pass)
1124                          * If we've already tried to lower the rate, and are
1125                          * now trying to raise it, use the lower rate. */
1126                         if (new_rate != IWL_RATE_INVALID)
1127                                 break;
1128
1129                         /* Loop again with higher rate */
1130                         else if (high != IWL_RATE_INVALID) {
1131                                 start_hi = high;
1132                                 rate = high;
1133
1134                         /* Higher rate not available, use the original */
1135                         } else {
1136                                 break;
1137                         }
1138                 }
1139         }
1140
1141         return new_rate;
1142 }
1143
1144 /*
1145  * Set up search table for MIMO
1146  */
1147 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1148                              struct iwl4965_lq_sta *lq_sta,
1149                              struct ieee80211_conf *conf,
1150                              struct sta_info *sta,
1151                              struct iwl4965_scale_tbl_info *tbl, int index)
1152 {
1153         u16 rate_mask;
1154         s32 rate;
1155         s8 is_green = lq_sta->is_green;
1156
1157         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1158             !sta->ht_info.ht_supported)
1159                 return -1;
1160
1161         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1162                 return -1;
1163
1164         /* Need both Tx chains/antennas to support MIMO */
1165         if (priv->hw_params.tx_chains_num < 2)
1166                 return -1;
1167
1168         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1169
1170         tbl->lq_type = LQ_MIMO2;
1171         tbl->is_dup = lq_sta->is_dup;
1172         tbl->action = 0;
1173         rate_mask = lq_sta->active_mimo2_rate;
1174
1175         if (priv->current_ht_config.supported_chan_width
1176                                         == IWL_CHANNEL_WIDTH_40MHZ)
1177                 tbl->is_fat = 1;
1178         else
1179                 tbl->is_fat = 0;
1180
1181         /* FIXME: - don't toggle SGI here
1182         if (tbl->is_fat) {
1183                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1184                         tbl->is_SGI = 1;
1185                 else
1186                         tbl->is_SGI = 0;
1187         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1188                 tbl->is_SGI = 1;
1189         else
1190                 tbl->is_SGI = 0;
1191         */
1192
1193         rs_set_expected_tpt_table(lq_sta, tbl);
1194
1195         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196
1197         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1198
1199         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1201                                                 rate, rate_mask);
1202                 return -1;
1203         }
1204         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1205
1206         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1207                      tbl->current_rate, is_green);
1208         return 0;
1209 }
1210
1211 /*
1212  * Set up search table for SISO
1213  */
1214 static int rs_switch_to_siso(struct iwl_priv *priv,
1215                              struct iwl4965_lq_sta *lq_sta,
1216                              struct ieee80211_conf *conf,
1217                              struct sta_info *sta,
1218                              struct iwl4965_scale_tbl_info *tbl, int index)
1219 {
1220         u16 rate_mask;
1221         u8 is_green = lq_sta->is_green;
1222         s32 rate;
1223
1224         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1225             !sta->ht_info.ht_supported)
1226                 return -1;
1227
1228         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1229
1230         tbl->is_dup = lq_sta->is_dup;
1231         tbl->lq_type = LQ_SISO;
1232         tbl->action = 0;
1233         rate_mask = lq_sta->active_siso_rate;
1234
1235         if (priv->current_ht_config.supported_chan_width
1236             == IWL_CHANNEL_WIDTH_40MHZ)
1237                 tbl->is_fat = 1;
1238         else
1239                 tbl->is_fat = 0;
1240
1241         /* FIXME: - don't toggle SGI here
1242         if (tbl->is_fat) {
1243                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1244                         tbl->is_SGI = 1;
1245                 else
1246                         tbl->is_SGI = 0;
1247         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1248                 tbl->is_SGI = 1;
1249         else
1250                 tbl->is_SGI = 0;
1251         */
1252
1253         if (is_green)
1254                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1255
1256         rs_set_expected_tpt_table(lq_sta, tbl);
1257         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1258
1259         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1261                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1262                              rate, rate_mask);
1263                 return -1;
1264         }
1265         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1266         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1267                      tbl->current_rate, is_green);
1268         return 0;
1269 }
1270
1271 /*
1272  * Try to switch to new modulation mode from legacy
1273  */
1274 static int rs_move_legacy_other(struct iwl_priv *priv,
1275                                 struct iwl4965_lq_sta *lq_sta,
1276                                 struct ieee80211_conf *conf,
1277                                 struct sta_info *sta,
1278                                 int index)
1279 {
1280         struct iwl4965_scale_tbl_info *tbl =
1281             &(lq_sta->lq_info[lq_sta->active_tbl]);
1282         struct iwl4965_scale_tbl_info *search_tbl =
1283             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1284         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1285         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1286                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1287         u8 start_action = tbl->action;
1288         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1289         int ret = 0;
1290
1291         for (; ;) {
1292                 switch (tbl->action) {
1293                 case IWL_LEGACY_SWITCH_ANTENNA:
1294                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1295
1296                         lq_sta->action_counter++;
1297
1298                         /* Don't change antenna if success has been great */
1299                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1300                                 break;
1301
1302                         /* Set up search table to try other antenna */
1303                         memcpy(search_tbl, tbl, sz);
1304
1305                         if (rs_toggle_antenna(valid_tx_ant,
1306                                 &search_tbl->current_rate, search_tbl)) {
1307                                 lq_sta->search_better_tbl = 1;
1308                                 goto out;
1309                         }
1310                         break;
1311                 case IWL_LEGACY_SWITCH_SISO:
1312                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1313
1314                         /* Set up search table to try SISO */
1315                         memcpy(search_tbl, tbl, sz);
1316                         search_tbl->is_SGI = 0;
1317                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1318                                                  search_tbl, index);
1319                         if (!ret) {
1320                                 lq_sta->search_better_tbl = 1;
1321                                 lq_sta->action_counter = 0;
1322                                 goto out;
1323                         }
1324
1325                         break;
1326                 case IWL_LEGACY_SWITCH_MIMO2:
1327                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1328
1329                         /* Set up search table to try MIMO */
1330                         memcpy(search_tbl, tbl, sz);
1331                         search_tbl->is_SGI = 0;
1332                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1333                                 /*FIXME:RS:need to check ant validity*/
1334                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1335                                                  search_tbl, index);
1336                         if (!ret) {
1337                                 lq_sta->search_better_tbl = 1;
1338                                 lq_sta->action_counter = 0;
1339                                 goto out;
1340                         }
1341                         break;
1342                 }
1343                 tbl->action++;
1344                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1345                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1346
1347                 if (tbl->action == start_action)
1348                         break;
1349
1350         }
1351         return 0;
1352
1353  out:
1354         tbl->action++;
1355         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1356                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1357         return 0;
1358
1359 }
1360
1361 /*
1362  * Try to switch to new modulation mode from SISO
1363  */
1364 static int rs_move_siso_to_other(struct iwl_priv *priv,
1365                                  struct iwl4965_lq_sta *lq_sta,
1366                                  struct ieee80211_conf *conf,
1367                                  struct sta_info *sta,
1368                                  int index)
1369 {
1370         u8 is_green = lq_sta->is_green;
1371         struct iwl4965_scale_tbl_info *tbl =
1372             &(lq_sta->lq_info[lq_sta->active_tbl]);
1373         struct iwl4965_scale_tbl_info *search_tbl =
1374             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1375         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1376         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1377                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1378         u8 start_action = tbl->action;
1379         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1380         int ret;
1381
1382         for (;;) {
1383                 lq_sta->action_counter++;
1384                 switch (tbl->action) {
1385                 case IWL_SISO_SWITCH_ANTENNA:
1386                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1387                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1388                                 break;
1389
1390                         memcpy(search_tbl, tbl, sz);
1391                         if (rs_toggle_antenna(valid_tx_ant,
1392                                        &search_tbl->current_rate, search_tbl)) {
1393                                 lq_sta->search_better_tbl = 1;
1394                                 goto out;
1395                         }
1396                         break;
1397                 case IWL_SISO_SWITCH_MIMO2:
1398                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1399                         memcpy(search_tbl, tbl, sz);
1400                         search_tbl->is_SGI = 0;
1401                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1402                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1403                                                  search_tbl, index);
1404                         if (!ret) {
1405                                 lq_sta->search_better_tbl = 1;
1406                                 goto out;
1407                         }
1408                         break;
1409                 case IWL_SISO_SWITCH_GI:
1410                         if (!tbl->is_fat &&
1411                                 !(priv->current_ht_config.sgf &
1412                                                 HT_SHORT_GI_20MHZ))
1413                                 break;
1414                         if (tbl->is_fat &&
1415                                 !(priv->current_ht_config.sgf &
1416                                                 HT_SHORT_GI_40MHZ))
1417                                 break;
1418
1419                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1420
1421                         memcpy(search_tbl, tbl, sz);
1422                         if (is_green) {
1423                                 if (!tbl->is_SGI)
1424                                         break;
1425                                 else
1426                                         IWL_ERROR("SGI was set in GF+SISO\n");
1427                         }
1428                         search_tbl->is_SGI = !tbl->is_SGI;
1429                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1430                         if (tbl->is_SGI) {
1431                                 s32 tpt = lq_sta->last_tpt / 100;
1432                                 if (tpt >= search_tbl->expected_tpt[index])
1433                                         break;
1434                         }
1435                         search_tbl->current_rate = rate_n_flags_from_tbl(
1436                                                 search_tbl, index, is_green);
1437                         lq_sta->search_better_tbl = 1;
1438                         goto out;
1439                 }
1440                 tbl->action++;
1441                 if (tbl->action > IWL_SISO_SWITCH_GI)
1442                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1443
1444                 if (tbl->action == start_action)
1445                         break;
1446         }
1447         return 0;
1448
1449  out:
1450         tbl->action++;
1451         if (tbl->action > IWL_SISO_SWITCH_GI)
1452                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1453         return 0;
1454 }
1455
1456 /*
1457  * Try to switch to new modulation mode from MIMO
1458  */
1459 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1460                                  struct iwl4965_lq_sta *lq_sta,
1461                                  struct ieee80211_conf *conf,
1462                                  struct sta_info *sta,
1463                                  int index)
1464 {
1465         s8 is_green = lq_sta->is_green;
1466         struct iwl4965_scale_tbl_info *tbl =
1467             &(lq_sta->lq_info[lq_sta->active_tbl]);
1468         struct iwl4965_scale_tbl_info *search_tbl =
1469             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1470         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1471                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1472         u8 start_action = tbl->action;
1473         /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1474         int ret;
1475
1476         for (;;) {
1477                 lq_sta->action_counter++;
1478                 switch (tbl->action) {
1479                 case IWL_MIMO_SWITCH_ANTENNA_A:
1480                 case IWL_MIMO_SWITCH_ANTENNA_B:
1481                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1482
1483                         /* Set up new search table for SISO */
1484                         memcpy(search_tbl, tbl, sz);
1485
1486                         /*FIXME:RS:need to check ant validity + C*/
1487                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1488                                 search_tbl->ant_type = ANT_A;
1489                         else
1490                                 search_tbl->ant_type = ANT_B;
1491
1492                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1493                                                  search_tbl, index);
1494                         if (!ret) {
1495                                 lq_sta->search_better_tbl = 1;
1496                                 goto out;
1497                         }
1498                         break;
1499
1500                 case IWL_MIMO_SWITCH_GI:
1501                         if (!tbl->is_fat &&
1502                                 !(priv->current_ht_config.sgf &
1503                                                 HT_SHORT_GI_20MHZ))
1504                                 break;
1505                         if (tbl->is_fat &&
1506                                 !(priv->current_ht_config.sgf &
1507                                                 HT_SHORT_GI_40MHZ))
1508                                 break;
1509
1510                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1511
1512                         /* Set up new search table for MIMO */
1513                         memcpy(search_tbl, tbl, sz);
1514                         search_tbl->is_SGI = !tbl->is_SGI;
1515                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1516                         /*
1517                          * If active table already uses the fastest possible
1518                          * modulation (dual stream with short guard interval),
1519                          * and it's working well, there's no need to look
1520                          * for a better type of modulation!
1521                          */
1522                         if (tbl->is_SGI) {
1523                                 s32 tpt = lq_sta->last_tpt / 100;
1524                                 if (tpt >= search_tbl->expected_tpt[index])
1525                                         break;
1526                         }
1527                         search_tbl->current_rate = rate_n_flags_from_tbl(
1528                                                 search_tbl, index, is_green);
1529                         lq_sta->search_better_tbl = 1;
1530                         goto out;
1531
1532                 }
1533                 tbl->action++;
1534                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1535                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1536
1537                 if (tbl->action == start_action)
1538                         break;
1539         }
1540
1541         return 0;
1542  out:
1543         tbl->action++;
1544         if (tbl->action > IWL_MIMO_SWITCH_GI)
1545                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1546         return 0;
1547
1548 }
1549
1550 /*
1551  * Check whether we should continue using same modulation mode, or
1552  * begin search for a new mode, based on:
1553  * 1) # tx successes or failures while using this mode
1554  * 2) # times calling this function
1555  * 3) elapsed time in this mode (not used, for now)
1556  */
1557 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1558 {
1559         struct iwl4965_scale_tbl_info *tbl;
1560         int i;
1561         int active_tbl;
1562         int flush_interval_passed = 0;
1563         struct iwl_priv *priv;
1564
1565         priv = lq_sta->drv;
1566         active_tbl = lq_sta->active_tbl;
1567
1568         tbl = &(lq_sta->lq_info[active_tbl]);
1569
1570         /* If we've been disallowing search, see if we should now allow it */
1571         if (lq_sta->stay_in_tbl) {
1572
1573                 /* Elapsed time using current modulation mode */
1574                 if (lq_sta->flush_timer)
1575                         flush_interval_passed =
1576                             time_after(jiffies,
1577                                        (unsigned long)(lq_sta->flush_timer +
1578                                         IWL_RATE_SCALE_FLUSH_INTVL));
1579
1580                 /*
1581                  * Check if we should allow search for new modulation mode.
1582                  * If many frames have failed or succeeded, or we've used
1583                  * this same modulation for a long time, allow search, and
1584                  * reset history stats that keep track of whether we should
1585                  * allow a new search.  Also (below) reset all bitmaps and
1586                  * stats in active history.
1587                  */
1588                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1589                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1590                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1591                      && (flush_interval_passed))) {
1592                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1593                                      lq_sta->total_failed,
1594                                      lq_sta->total_success,
1595                                      flush_interval_passed);
1596
1597                         /* Allow search for new mode */
1598                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1599                         lq_sta->total_failed = 0;
1600                         lq_sta->total_success = 0;
1601                         lq_sta->flush_timer = 0;
1602
1603                 /*
1604                  * Else if we've used this modulation mode enough repetitions
1605                  * (regardless of elapsed time or success/failure), reset
1606                  * history bitmaps and rate-specific stats for all rates in
1607                  * active table.
1608                  */
1609                 } else {
1610                         lq_sta->table_count++;
1611                         if (lq_sta->table_count >=
1612                             lq_sta->table_count_limit) {
1613                                 lq_sta->table_count = 0;
1614
1615                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1616                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1617                                         rs_rate_scale_clear_window(
1618                                                 &(tbl->win[i]));
1619                         }
1620                 }
1621
1622                 /* If transitioning to allow "search", reset all history
1623                  * bitmaps and stats in active table (this will become the new
1624                  * "search" table). */
1625                 if (!lq_sta->stay_in_tbl) {
1626                         for (i = 0; i < IWL_RATE_COUNT; i++)
1627                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1628                 }
1629         }
1630 }
1631
1632 /*
1633  * Do rate scaling and search for new modulation mode.
1634  */
1635 static void rs_rate_scale_perform(struct iwl_priv *priv,
1636                                   struct net_device *dev,
1637                                   struct ieee80211_hdr *hdr,
1638                                   struct sta_info *sta)
1639 {
1640         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1641         struct ieee80211_hw *hw = local_to_hw(local);
1642         struct ieee80211_conf *conf = &hw->conf;
1643         int low = IWL_RATE_INVALID;
1644         int high = IWL_RATE_INVALID;
1645         int index;
1646         int i;
1647         struct iwl4965_rate_scale_data *window = NULL;
1648         int current_tpt = IWL_INVALID_VALUE;
1649         int low_tpt = IWL_INVALID_VALUE;
1650         int high_tpt = IWL_INVALID_VALUE;
1651         u32 fail_count;
1652         s8 scale_action = 0;
1653         u16 fc, rate_mask;
1654         u8 update_lq = 0;
1655         struct iwl4965_lq_sta *lq_sta;
1656         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1657         u16 rate_scale_index_msk = 0;
1658         u32 rate;
1659         u8 is_green = 0;
1660         u8 active_tbl = 0;
1661         u8 done_search = 0;
1662         u16 high_low;
1663         s32 sr;
1664         u8 tid = MAX_TID_COUNT;
1665
1666         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1667
1668         fc = le16_to_cpu(hdr->frame_control);
1669         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1670                 /* Send management frames and broadcast/multicast data using
1671                  * lowest rate. */
1672                 /* TODO: this could probably be improved.. */
1673                 return;
1674         }
1675
1676         if (!sta || !sta->rate_ctrl_priv)
1677                 return;
1678
1679         if (!priv->lq_mngr.lq_ready) {
1680                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1681                 return;
1682         }
1683         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1684
1685         tid = rs_tl_add_packet(lq_sta, hdr);
1686
1687         /*
1688          * Select rate-scale / modulation-mode table to work with in
1689          * the rest of this function:  "search" if searching for better
1690          * modulation mode, or "active" if doing rate scaling within a mode.
1691          */
1692         if (!lq_sta->search_better_tbl)
1693                 active_tbl = lq_sta->active_tbl;
1694         else
1695                 active_tbl = 1 - lq_sta->active_tbl;
1696
1697         tbl = &(lq_sta->lq_info[active_tbl]);
1698         is_green = lq_sta->is_green;
1699
1700         /* current tx rate */
1701         index = sta->last_txrate_idx;
1702
1703         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1704                        tbl->lq_type);
1705
1706         /* rates available for this association, and for modulation mode */
1707         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1708
1709         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1710
1711         /* mask with station rate restriction */
1712         if (is_legacy(tbl->lq_type)) {
1713                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1714                         /* supp_rates has no CCK bits in A mode */
1715                         rate_scale_index_msk = (u16) (rate_mask &
1716                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1717                 else
1718                         rate_scale_index_msk = (u16) (rate_mask &
1719                                                       lq_sta->supp_rates);
1720
1721         } else
1722                 rate_scale_index_msk = rate_mask;
1723
1724         if (!rate_scale_index_msk)
1725                 rate_scale_index_msk = rate_mask;
1726
1727         if (!((1 << index) & rate_scale_index_msk)) {
1728                 IWL_ERROR("Current Rate is not valid\n");
1729                 return;
1730         }
1731
1732         /* Get expected throughput table and history window for current rate */
1733         if (!tbl->expected_tpt) {
1734                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1735                 return;
1736         }
1737
1738         window = &(tbl->win[index]);
1739
1740         /*
1741          * If there is not enough history to calculate actual average
1742          * throughput, keep analyzing results of more tx frames, without
1743          * changing rate or mode (bypass most of the rest of this function).
1744          * Set up new rate table in uCode only if old rate is not supported
1745          * in current association (use new rate found above).
1746          */
1747         fail_count = window->counter - window->success_counter;
1748         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1749                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1750                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1751                                "for index %d\n",
1752                                window->success_counter, window->counter, index);
1753
1754                 /* Can't calculate this yet; not enough history */
1755                 window->average_tpt = IWL_INVALID_VALUE;
1756
1757                 /* Should we stay with this modulation mode,
1758                  * or search for a new one? */
1759                 rs_stay_in_table(lq_sta);
1760
1761                 goto out;
1762
1763         /* Else we have enough samples; calculate estimate of
1764          * actual average throughput */
1765         } else {
1766                 /*FIXME:RS remove this else if we don't get this error*/
1767                 if (window->average_tpt != ((window->success_ratio *
1768                                 tbl->expected_tpt[index] + 64) / 128)) {
1769                         IWL_ERROR("expected_tpt should have been calculated"
1770                                                                 " by now\n");
1771                         window->average_tpt = ((window->success_ratio *
1772                                         tbl->expected_tpt[index] + 64) / 128);
1773                 }
1774         }
1775
1776         /* If we are searching for better modulation mode, check success. */
1777         if (lq_sta->search_better_tbl) {
1778
1779                 /* If good success, continue using the "search" mode;
1780                  * no need to send new link quality command, since we're
1781                  * continuing to use the setup that we've been trying. */
1782                 if (window->average_tpt > lq_sta->last_tpt) {
1783
1784                         IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1785                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1786                                         window->success_ratio,
1787                                         window->average_tpt,
1788                                         lq_sta->last_tpt);
1789
1790                         if (!is_legacy(tbl->lq_type))
1791                                 lq_sta->enable_counter = 1;
1792
1793                         /* Swap tables; "search" becomes "active" */
1794                         lq_sta->active_tbl = active_tbl;
1795                         current_tpt = window->average_tpt;
1796
1797                 /* Else poor success; go back to mode in "active" table */
1798                 } else {
1799
1800                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1801                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1802                                         window->success_ratio,
1803                                         window->average_tpt,
1804                                         lq_sta->last_tpt);
1805
1806                         /* Nullify "search" table */
1807                         tbl->lq_type = LQ_NONE;
1808
1809                         /* Revert to "active" table */
1810                         active_tbl = lq_sta->active_tbl;
1811                         tbl = &(lq_sta->lq_info[active_tbl]);
1812
1813                         /* Revert to "active" rate and throughput info */
1814                         index = iwl4965_hwrate_to_plcp_idx(
1815                                                         tbl->current_rate);
1816                         current_tpt = lq_sta->last_tpt;
1817
1818                         /* Need to set up a new rate table in uCode */
1819                         update_lq = 1;
1820                 }
1821
1822                 /* Either way, we've made a decision; modulation mode
1823                  * search is done, allow rate adjustment next time. */
1824                 lq_sta->search_better_tbl = 0;
1825                 done_search = 1;        /* Don't switch modes below! */
1826                 goto lq_update;
1827         }
1828
1829         /* (Else) not in search of better modulation mode, try for better
1830          * starting rate, while staying in this mode. */
1831         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1832                                         tbl->lq_type);
1833         low = high_low & 0xff;
1834         high = (high_low >> 8) & 0xff;
1835
1836         sr = window->success_ratio;
1837
1838         /* Collect measured throughputs for current and adjacent rates */
1839         current_tpt = window->average_tpt;
1840         if (low != IWL_RATE_INVALID)
1841                 low_tpt = tbl->win[low].average_tpt;
1842         if (high != IWL_RATE_INVALID)
1843                 high_tpt = tbl->win[high].average_tpt;
1844
1845         scale_action = 0;
1846
1847         /* Too many failures, decrease rate */
1848         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1849                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1850                 scale_action = -1;
1851
1852         /* No throughput measured yet for adjacent rates; try increase. */
1853         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1854                    (high_tpt == IWL_INVALID_VALUE)) {
1855
1856                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1857                         scale_action = 1;
1858                 else if (low != IWL_RATE_INVALID)
1859                         scale_action = -1;
1860         }
1861
1862         /* Both adjacent throughputs are measured, but neither one has better
1863          * throughput; we're using the best rate, don't change it! */
1864         else if ((low_tpt != IWL_INVALID_VALUE) &&
1865                  (high_tpt != IWL_INVALID_VALUE) &&
1866                  (low_tpt < current_tpt) &&
1867                  (high_tpt < current_tpt))
1868                 scale_action = 0;
1869
1870         /* At least one adjacent rate's throughput is measured,
1871          * and may have better performance. */
1872         else {
1873                 /* Higher adjacent rate's throughput is measured */
1874                 if (high_tpt != IWL_INVALID_VALUE) {
1875                         /* Higher rate has better throughput */
1876                         if (high_tpt > current_tpt &&
1877                                         sr >= IWL_RATE_INCREASE_TH) {
1878                                 scale_action = 1;
1879                         } else {
1880                                 IWL_DEBUG_RATE
1881                                     ("decrease rate because of high tpt\n");
1882                                 scale_action = -1;
1883                         }
1884
1885                 /* Lower adjacent rate's throughput is measured */
1886                 } else if (low_tpt != IWL_INVALID_VALUE) {
1887                         /* Lower rate has better throughput */
1888                         if (low_tpt > current_tpt) {
1889                                 IWL_DEBUG_RATE
1890                                     ("decrease rate because of low tpt\n");
1891                                 scale_action = -1;
1892                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1893                                 scale_action = 1;
1894                         }
1895                 }
1896         }
1897
1898         /* Sanity check; asked for decrease, but success rate or throughput
1899          * has been good at old rate.  Don't change it. */
1900         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1901                     ((sr > IWL_RATE_HIGH_TH) ||
1902                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1903                 scale_action = 0;
1904
1905         switch (scale_action) {
1906         case -1:
1907                 /* Decrease starting rate, update uCode's rate table */
1908                 if (low != IWL_RATE_INVALID) {
1909                         update_lq = 1;
1910                         index = low;
1911                 }
1912                 break;
1913         case 1:
1914                 /* Increase starting rate, update uCode's rate table */
1915                 if (high != IWL_RATE_INVALID) {
1916                         update_lq = 1;
1917                         index = high;
1918                 }
1919
1920                 break;
1921         case 0:
1922                 /* No change */
1923         default:
1924                 break;
1925         }
1926
1927         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1928                     "high %d type %d\n",
1929                      index, scale_action, low, high, tbl->lq_type);
1930
1931 lq_update:
1932         /* Replace uCode's rate table for the destination station. */
1933         if (update_lq) {
1934                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1935                 rs_fill_link_cmd(priv, lq_sta, rate);
1936                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1937         }
1938
1939         /* Should we stay with this modulation mode, or search for a new one? */
1940         rs_stay_in_table(lq_sta);
1941
1942         /*
1943          * Search for new modulation mode if we're:
1944          * 1)  Not changing rates right now
1945          * 2)  Not just finishing up a search
1946          * 3)  Allowing a new search
1947          */
1948         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1949                 /* Save current throughput to compare with "search" throughput*/
1950                 lq_sta->last_tpt = current_tpt;
1951
1952                 /* Select a new "search" modulation mode to try.
1953                  * If one is found, set up the new "search" table. */
1954                 if (is_legacy(tbl->lq_type))
1955                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1956                 else if (is_siso(tbl->lq_type))
1957                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1958                 else
1959                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1960
1961                 /* If new "search" mode was selected, set up in uCode table */
1962                 if (lq_sta->search_better_tbl) {
1963                         /* Access the "search" table, clear its history. */
1964                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1965                         for (i = 0; i < IWL_RATE_COUNT; i++)
1966                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1967
1968                         /* Use new "search" start rate */
1969                         index = iwl4965_hwrate_to_plcp_idx(
1970                                                         tbl->current_rate);
1971
1972                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
1973                                      tbl->current_rate, index);
1974                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1975                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1976                 }
1977
1978                 /* If the "active" (non-search) mode was legacy,
1979                  * and we've tried switching antennas,
1980                  * but we haven't been able to try HT modes (not available),
1981                  * stay with best antenna legacy modulation for a while
1982                  * before next round of mode comparisons. */
1983                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1984                 if (is_legacy(tbl1->lq_type) &&
1985                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1986                     (lq_sta->action_counter >= 1)) {
1987                         lq_sta->action_counter = 0;
1988                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1989                         rs_set_stay_in_table(priv, 1, lq_sta);
1990                 }
1991
1992                 /* If we're in an HT mode, and all 3 mode switch actions
1993                  * have been tried and compared, stay in this best modulation
1994                  * mode for a while before next round of mode comparisons. */
1995                 if (lq_sta->enable_counter &&
1996                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1997                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1998                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1999                             (tid != MAX_TID_COUNT)) {
2000                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2001                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2002                         }
2003                         lq_sta->action_counter = 0;
2004                         rs_set_stay_in_table(priv, 0, lq_sta);
2005                 }
2006
2007         /*
2008          * Else, don't search for a new modulation mode.
2009          * Put new timestamp in stay-in-modulation-mode flush timer if:
2010          * 1)  Not changing rates right now
2011          * 2)  Not just finishing up a search
2012          * 3)  flush timer is empty
2013          */
2014         } else {
2015                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2016                         lq_sta->flush_timer = jiffies;
2017         }
2018
2019 out:
2020         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2021         i = index;
2022         sta->last_txrate_idx = i;
2023
2024         /* sta->txrate_idx is an index to A mode rates which start
2025          * at IWL_FIRST_OFDM_RATE
2026          */
2027         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2028                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2029         else
2030                 sta->txrate_idx = i;
2031
2032         return;
2033 }
2034
2035
2036 static void rs_initialize_lq(struct iwl_priv *priv,
2037                              struct ieee80211_conf *conf,
2038                              struct sta_info *sta)
2039 {
2040         struct iwl4965_lq_sta *lq_sta;
2041         struct iwl4965_scale_tbl_info *tbl;
2042         int rate_idx;
2043         int i;
2044         u32 rate;
2045         u8 use_green = rs_use_green(priv, conf);
2046         u8 active_tbl = 0;
2047         u8 valid_tx_ant;
2048
2049         if (!sta || !sta->rate_ctrl_priv)
2050                 goto out;
2051
2052         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2053         i = sta->last_txrate_idx;
2054
2055         if ((lq_sta->lq.sta_id == 0xff) &&
2056             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2057                 goto out;
2058
2059         valid_tx_ant = priv->hw_params.valid_tx_ant;
2060
2061         if (!lq_sta->search_better_tbl)
2062                 active_tbl = lq_sta->active_tbl;
2063         else
2064                 active_tbl = 1 - lq_sta->active_tbl;
2065
2066         tbl = &(lq_sta->lq_info[active_tbl]);
2067
2068         if ((i < 0) || (i >= IWL_RATE_COUNT))
2069                 i = 0;
2070
2071         /* FIXME:RS: This is also wrong in 4965 */
2072         rate = iwl_rates[i].plcp;
2073         rate |= RATE_MCS_ANT_B_MSK;
2074         rate &= ~RATE_MCS_ANT_A_MSK;
2075
2076         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2077                 rate |= RATE_MCS_CCK_MSK;
2078
2079         tbl->ant_type = ANT_B;
2080         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2081         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2082             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2083
2084         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2085         tbl->current_rate = rate;
2086         rs_set_expected_tpt_table(lq_sta, tbl);
2087         rs_fill_link_cmd(NULL, lq_sta, rate);
2088         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2089  out:
2090         return;
2091 }
2092
2093 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2094                         struct ieee80211_supported_band *sband,
2095                         struct sk_buff *skb,
2096                         struct rate_selection *sel)
2097 {
2098
2099         int i;
2100         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2101         struct ieee80211_conf *conf = &local->hw.conf;
2102         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2103         struct sta_info *sta;
2104         u16 fc;
2105         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2106         struct iwl4965_lq_sta *lq_sta;
2107
2108         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2109
2110         rcu_read_lock();
2111
2112         sta = sta_info_get(local, hdr->addr1);
2113
2114         /* Send management frames and broadcast/multicast data using lowest
2115          * rate. */
2116         fc = le16_to_cpu(hdr->frame_control);
2117         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2118             !sta || !sta->rate_ctrl_priv) {
2119                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2120                 goto out;
2121         }
2122
2123         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2124         i = sta->last_txrate_idx;
2125
2126         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2127             !lq_sta->ibss_sta_added) {
2128                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2129                 DECLARE_MAC_BUF(mac);
2130
2131                 if (sta_id == IWL_INVALID_STATION) {
2132                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2133                                        print_mac(mac, hdr->addr1));
2134                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2135                                                         0, CMD_ASYNC, NULL);
2136                 }
2137                 if ((sta_id != IWL_INVALID_STATION)) {
2138                         lq_sta->lq.sta_id = sta_id;
2139                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2140                         lq_sta->ibss_sta_added = 1;
2141                         rs_initialize_lq(priv, conf, sta);
2142                 }
2143                 if (!lq_sta->ibss_sta_added)
2144                         goto done;
2145         }
2146
2147 done:
2148         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2149                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2150                 goto out;
2151         }
2152
2153         if (sband->band == IEEE80211_BAND_5GHZ)
2154                 i -= IWL_FIRST_OFDM_RATE;
2155         sel->rate_idx = i;
2156 out:
2157         rcu_read_unlock();
2158 }
2159
2160 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2161 {
2162         struct iwl4965_lq_sta *lq_sta;
2163         struct iwl_priv *priv;
2164         int i, j;
2165
2166         priv = (struct iwl_priv *)priv_rate;
2167         IWL_DEBUG_RATE("create station rate scale window\n");
2168
2169         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2170
2171         if (lq_sta == NULL)
2172                 return NULL;
2173         lq_sta->lq.sta_id = 0xff;
2174
2175
2176         for (j = 0; j < LQ_SIZE; j++)
2177                 for (i = 0; i < IWL_RATE_COUNT; i++)
2178                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2179
2180         return lq_sta;
2181 }
2182
2183 static void rs_rate_init(void *priv_rate, void *priv_sta,
2184                          struct ieee80211_local *local,
2185                          struct sta_info *sta)
2186 {
2187         int i, j;
2188         struct ieee80211_conf *conf = &local->hw.conf;
2189         struct ieee80211_supported_band *sband;
2190         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2191         struct iwl4965_lq_sta *lq_sta = priv_sta;
2192
2193         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2194
2195         lq_sta->flush_timer = 0;
2196         lq_sta->supp_rates = sta->supp_rates[sband->band];
2197         sta->txrate_idx = 3;
2198         for (j = 0; j < LQ_SIZE; j++)
2199                 for (i = 0; i < IWL_RATE_COUNT; i++)
2200                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2201
2202         IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2203         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2204          * the lowest or the highest rate.. Could consider using RSSI from
2205          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2206          * after assoc.. */
2207
2208         lq_sta->ibss_sta_added = 0;
2209         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2210                 u8 sta_id = iwl_find_station(priv, sta->addr);
2211                 DECLARE_MAC_BUF(mac);
2212
2213                 /* for IBSS the call are from tasklet */
2214                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2215                              print_mac(mac, sta->addr));
2216
2217                 if (sta_id == IWL_INVALID_STATION) {
2218                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2219                                        print_mac(mac, sta->addr));
2220                         sta_id = iwl_add_station_flags(priv, sta->addr,
2221                                                         0, CMD_ASYNC, NULL);
2222                 }
2223                 if ((sta_id != IWL_INVALID_STATION)) {
2224                         lq_sta->lq.sta_id = sta_id;
2225                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2226                 }
2227                 /* FIXME: this is w/a remove it later */
2228                 priv->assoc_station_added = 1;
2229         }
2230
2231         /* Find highest tx rate supported by hardware and destination station */
2232         for (i = 0; i < sband->n_bitrates; i++)
2233                 if (sta->supp_rates[sband->band] & BIT(i))
2234                         sta->txrate_idx = i;
2235
2236         sta->last_txrate_idx = sta->txrate_idx;
2237         /* WTF is with this bogus comment? A doesn't have cck rates */
2238         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2239         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2240                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2241
2242         lq_sta->is_dup = 0;
2243         lq_sta->is_green = rs_use_green(priv, conf);
2244         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2245         lq_sta->active_rate_basic = priv->active_rate_basic;
2246         lq_sta->band = priv->band;
2247         /*
2248          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2249          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2250          */
2251         lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2252         lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2253         lq_sta->active_siso_rate &= ~((u16)0x2);
2254         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2255
2256         /* Same here */
2257         lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2258         lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2259         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2260         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2261
2262         lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2263         lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2264         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2265         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2266
2267         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2268                      lq_sta->active_siso_rate,
2269                      lq_sta->active_mimo2_rate,
2270                      lq_sta->active_mimo3_rate);
2271
2272         /* These values will be overriden later */
2273         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2274         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2275
2276         /* as default allow aggregation for all tids */
2277         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2278 #ifdef CONFIG_MAC80211_DEBUGFS
2279         lq_sta->drv = priv;
2280 #endif
2281
2282         if (priv->assoc_station_added)
2283                 priv->lq_mngr.lq_ready = 1;
2284
2285         rs_initialize_lq(priv, conf, sta);
2286 }
2287
2288 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2289                              struct iwl4965_lq_sta *lq_sta,
2290                              u32 new_rate)
2291 {
2292         struct iwl4965_scale_tbl_info tbl_type;
2293         int index = 0;
2294         int rate_idx;
2295         int repeat_rate = 0;
2296         u8 ant_toggle_cnt = 0;
2297         u8 use_ht_possible = 1;
2298         u8 valid_tx_ant = 0;
2299         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2300
2301         /* Override starting rate (index 0) if needed for debug purposes */
2302         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2303
2304         /* Interpret new_rate (rate_n_flags) */
2305         memset(&tbl_type, 0, sizeof(tbl_type));
2306         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2307                                   &tbl_type, &rate_idx);
2308
2309         /* How many times should we repeat the initial rate? */
2310         if (is_legacy(tbl_type.lq_type)) {
2311                 ant_toggle_cnt = 1;
2312                 repeat_rate = IWL_NUMBER_TRY;
2313         } else {
2314                 repeat_rate = IWL_HT_NUMBER_TRY;
2315         }
2316
2317         lq_cmd->general_params.mimo_delimiter =
2318                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2319
2320         /* Fill 1st table entry (index 0) */
2321         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2322
2323         if (num_of_ant(tbl_type.ant_type) == 1) {
2324                 lq_cmd->general_params.single_stream_ant_msk =
2325                                                 tbl_type.ant_type;
2326         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2327                 lq_cmd->general_params.dual_stream_ant_msk =
2328                                                 tbl_type.ant_type;
2329         } /* otherwise we don't modify the existing value */
2330
2331         index++;
2332         repeat_rate--;
2333
2334         if (priv)
2335                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2336
2337         /* Fill rest of rate table */
2338         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2339                 /* Repeat initial/next rate.
2340                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2341                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2342                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2343                         if (is_legacy(tbl_type.lq_type)) {
2344                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2345                                         ant_toggle_cnt++;
2346                                 else if (priv &&
2347                                          rs_toggle_antenna(valid_tx_ant,
2348                                                         &new_rate, &tbl_type))
2349                                         ant_toggle_cnt = 1;
2350 }
2351
2352                         /* Override next rate if needed for debug purposes */
2353                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2354
2355                         /* Fill next table entry */
2356                         lq_cmd->rs_table[index].rate_n_flags =
2357                                         cpu_to_le32(new_rate);
2358                         repeat_rate--;
2359                         index++;
2360                 }
2361
2362                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2363                                                 &rate_idx);
2364
2365                 /* Indicate to uCode which entries might be MIMO.
2366                  * If initial rate was MIMO, this will finally end up
2367                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2368                 if (is_mimo(tbl_type.lq_type))
2369                         lq_cmd->general_params.mimo_delimiter = index;
2370
2371                 /* Get next rate */
2372                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2373                                              use_ht_possible);
2374
2375                 /* How many times should we repeat the next rate? */
2376                 if (is_legacy(tbl_type.lq_type)) {
2377                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2378                                 ant_toggle_cnt++;
2379                         else if (priv &&
2380                                  rs_toggle_antenna(valid_tx_ant,
2381                                                    &new_rate, &tbl_type))
2382                                 ant_toggle_cnt = 1;
2383
2384                         repeat_rate = IWL_NUMBER_TRY;
2385                 } else {
2386                         repeat_rate = IWL_HT_NUMBER_TRY;
2387                 }
2388
2389                 /* Don't allow HT rates after next pass.
2390                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2391                 use_ht_possible = 0;
2392
2393                 /* Override next rate if needed for debug purposes */
2394                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2395
2396                 /* Fill next table entry */
2397                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2398
2399                 index++;
2400                 repeat_rate--;
2401         }
2402
2403         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2404         lq_cmd->agg_params.agg_dis_start_th = 3;
2405         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2406 }
2407
2408 static void *rs_alloc(struct ieee80211_local *local)
2409 {
2410         return local->hw.priv;
2411 }
2412 /* rate scale requires free function to be implemented */
2413 static void rs_free(void *priv_rate)
2414 {
2415         return;
2416 }
2417
2418 static void rs_clear(void *priv_rate)
2419 {
2420         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2421
2422         IWL_DEBUG_RATE("enter\n");
2423
2424         priv->lq_mngr.lq_ready = 0;
2425
2426         IWL_DEBUG_RATE("leave\n");
2427 }
2428
2429 static void rs_free_sta(void *priv_rate, void *priv_sta)
2430 {
2431         struct iwl4965_lq_sta *lq_sta = priv_sta;
2432         struct iwl_priv *priv;
2433
2434         priv = (struct iwl_priv *)priv_rate;
2435         IWL_DEBUG_RATE("enter\n");
2436         kfree(lq_sta);
2437         IWL_DEBUG_RATE("leave\n");
2438 }
2439
2440
2441 #ifdef CONFIG_MAC80211_DEBUGFS
2442 static int open_file_generic(struct inode *inode, struct file *file)
2443 {
2444         file->private_data = inode->i_private;
2445         return 0;
2446 }
2447 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2448                                 u32 *rate_n_flags, int index)
2449 {
2450         struct iwl_priv *priv;
2451
2452         priv = lq_sta->drv;
2453         if (lq_sta->dbg_fixed_rate) {
2454                 if (index < 12) {
2455                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2456                 } else {
2457                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2458                                 *rate_n_flags = 0x800D;
2459                         else
2460                                 *rate_n_flags = 0x820A;
2461                 }
2462                 IWL_DEBUG_RATE("Fixed rate ON\n");
2463         } else {
2464                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2465         }
2466 }
2467
2468 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2469                         const char __user *user_buf, size_t count, loff_t *ppos)
2470 {
2471         struct iwl4965_lq_sta *lq_sta = file->private_data;
2472         struct iwl_priv *priv;
2473         char buf[64];
2474         int buf_size;
2475         u32 parsed_rate;
2476
2477         priv = lq_sta->drv;
2478         memset(buf, 0, sizeof(buf));
2479         buf_size = min(count, sizeof(buf) -  1);
2480         if (copy_from_user(buf, user_buf, buf_size))
2481                 return -EFAULT;
2482
2483         if (sscanf(buf, "%x", &parsed_rate) == 1)
2484                 lq_sta->dbg_fixed_rate = parsed_rate;
2485         else
2486                 lq_sta->dbg_fixed_rate = 0;
2487
2488         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2489         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2490         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2491         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2492
2493         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2494                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2495
2496         if (lq_sta->dbg_fixed_rate) {
2497                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2498                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2499         }
2500
2501         return count;
2502 }
2503
2504 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2505                         char __user *user_buf, size_t count, loff_t *ppos)
2506 {
2507         char buff[1024];
2508         int desc = 0;
2509         int i = 0;
2510
2511         struct iwl4965_lq_sta *lq_sta = file->private_data;
2512
2513         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2514         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2515                         lq_sta->total_failed, lq_sta->total_success,
2516                         lq_sta->active_legacy_rate);
2517         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2518                         lq_sta->dbg_fixed_rate);
2519         desc += sprintf(buff+desc, "general:"
2520                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2521                 lq_sta->lq.general_params.flags,
2522                 lq_sta->lq.general_params.mimo_delimiter,
2523                 lq_sta->lq.general_params.single_stream_ant_msk,
2524                 lq_sta->lq.general_params.dual_stream_ant_msk);
2525
2526         desc += sprintf(buff+desc, "agg:"
2527                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2528                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2529                         lq_sta->lq.agg_params.agg_dis_start_th,
2530                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2531
2532         desc += sprintf(buff+desc,
2533                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2534                         lq_sta->lq.general_params.start_rate_index[0],
2535                         lq_sta->lq.general_params.start_rate_index[1],
2536                         lq_sta->lq.general_params.start_rate_index[2],
2537                         lq_sta->lq.general_params.start_rate_index[3]);
2538
2539
2540         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2541                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2542                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2543
2544         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2545 }
2546
2547 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2548         .write = rs_sta_dbgfs_scale_table_write,
2549         .read = rs_sta_dbgfs_scale_table_read,
2550         .open = open_file_generic,
2551 };
2552 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2553                         char __user *user_buf, size_t count, loff_t *ppos)
2554 {
2555         char buff[1024];
2556         int desc = 0;
2557         int i, j;
2558
2559         struct iwl4965_lq_sta *lq_sta = file->private_data;
2560         for (i = 0; i < LQ_SIZE; i++) {
2561                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2562                                 "rate=0x%X\n",
2563                                 lq_sta->active_tbl == i?"*":"x",
2564                                 lq_sta->lq_info[i].lq_type,
2565                                 lq_sta->lq_info[i].is_SGI,
2566                                 lq_sta->lq_info[i].is_fat,
2567                                 lq_sta->lq_info[i].is_dup,
2568                                 lq_sta->lq_info[i].current_rate);
2569                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2570                         desc += sprintf(buff+desc,
2571                                 "counter=%d success=%d %%=%d\n",
2572                                 lq_sta->lq_info[i].win[j].counter,
2573                                 lq_sta->lq_info[i].win[j].success_counter,
2574                                 lq_sta->lq_info[i].win[j].success_ratio);
2575                 }
2576         }
2577         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2578 }
2579
2580 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2581         .read = rs_sta_dbgfs_stats_table_read,
2582         .open = open_file_generic,
2583 };
2584
2585 static void rs_add_debugfs(void *priv, void *priv_sta,
2586                                         struct dentry *dir)
2587 {
2588         struct iwl4965_lq_sta *lq_sta = priv_sta;
2589         lq_sta->rs_sta_dbgfs_scale_table_file =
2590                 debugfs_create_file("rate_scale_table", 0600, dir,
2591                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2592         lq_sta->rs_sta_dbgfs_stats_table_file =
2593                 debugfs_create_file("rate_stats_table", 0600, dir,
2594                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2595         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2596                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2597                 &lq_sta->tx_agg_tid_en);
2598
2599 }
2600
2601 static void rs_remove_debugfs(void *priv, void *priv_sta)
2602 {
2603         struct iwl4965_lq_sta *lq_sta = priv_sta;
2604         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2605         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2606         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2607 }
2608 #endif
2609
2610 static struct rate_control_ops rs_ops = {
2611         .module = NULL,
2612         .name = RS_NAME,
2613         .tx_status = rs_tx_status,
2614         .get_rate = rs_get_rate,
2615         .rate_init = rs_rate_init,
2616         .clear = rs_clear,
2617         .alloc = rs_alloc,
2618         .free = rs_free,
2619         .alloc_sta = rs_alloc_sta,
2620         .free_sta = rs_free_sta,
2621 #ifdef CONFIG_MAC80211_DEBUGFS
2622         .add_sta_debugfs = rs_add_debugfs,
2623         .remove_sta_debugfs = rs_remove_debugfs,
2624 #endif
2625 };
2626
2627 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2628 {
2629         struct ieee80211_local *local = hw_to_local(hw);
2630         struct iwl_priv *priv = hw->priv;
2631         struct iwl4965_lq_sta *lq_sta;
2632         struct sta_info *sta;
2633         int cnt = 0, i;
2634         u32 samples = 0, success = 0, good = 0;
2635         unsigned long now = jiffies;
2636         u32 max_time = 0;
2637         u8 lq_type, antenna;
2638
2639         rcu_read_lock();
2640
2641         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2642         if (!sta || !sta->rate_ctrl_priv) {
2643                 if (sta)
2644                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2645                 else
2646                         IWL_DEBUG_RATE("leave - no station!\n");
2647                 rcu_read_unlock();
2648                 return sprintf(buf, "station %d not found\n", sta_id);
2649         }
2650
2651         lq_sta = (void *)sta->rate_ctrl_priv;
2652
2653         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2654         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2655
2656         if (is_legacy(lq_type))
2657                 i = IWL_RATE_54M_INDEX;
2658         else
2659                 i = IWL_RATE_60M_INDEX;
2660         while (1) {
2661                 u64 mask;
2662                 int j;
2663                 int active = lq_sta->active_tbl;
2664
2665                 cnt +=
2666                     sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2667
2668                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2669                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2670                         buf[cnt++] =
2671                                 (lq_sta->lq_info[active].win[i].data & mask)
2672                                 ? '1' : '0';
2673
2674                 samples += lq_sta->lq_info[active].win[i].counter;
2675                 good += lq_sta->lq_info[active].win[i].success_counter;
2676                 success += lq_sta->lq_info[active].win[i].success_counter *
2677                            iwl_rates[i].ieee;
2678
2679                 if (lq_sta->lq_info[active].win[i].stamp) {
2680                         int delta =
2681                                    jiffies_to_msecs(now -
2682                                    lq_sta->lq_info[active].win[i].stamp);
2683
2684                         if (delta > max_time)
2685                                 max_time = delta;
2686
2687                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2688                 } else
2689                         buf[cnt++] = '\n';
2690
2691                 j = iwl4965_get_prev_ieee_rate(i);
2692                 if (j == i)
2693                         break;
2694                 i = j;
2695         }
2696
2697         /*
2698          * Display the average rate of all samples taken.
2699          * NOTE: We multiply # of samples by 2 since the IEEE measurement
2700          * added from iwl_rates is actually 2X the rate.
2701          */
2702         if (samples)
2703                 cnt += sprintf(&buf[cnt],
2704                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2705                          "%3d%% success (%d good packets over %d tries)\n",
2706                          success / (2 * samples), (success * 5 / samples) % 10,
2707                          max_time, good * 100 / samples, good, samples);
2708         else
2709                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2710
2711         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2712                          "active_search %d rate index %d\n", lq_type, antenna,
2713                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2714
2715         rcu_read_unlock();
2716         return cnt;
2717 }
2718
2719 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2720 {
2721         struct iwl_priv *priv = hw->priv;
2722
2723         priv->lq_mngr.lq_ready = 1;
2724 }
2725
2726 int iwl4965_rate_control_register(void)
2727 {
2728         return ieee80211_rate_control_register(&rs_ops);
2729 }
2730
2731 void iwl4965_rate_control_unregister(void)
2732 {
2733         ieee80211_rate_control_unregister(&rs_ops);
2734 }
2735