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 #ifdef CONFIG_IWL4965_HT
 109
 110 struct iwl4965_traffic_load {
 111         unsigned long time_stamp;       /* age of the oldest statistics */
 112         u32 packet_count[TID_QUEUE_MAX_SIZE];   /* packet count in this time
 113                                                  * slice */
 114         u32 total;                      /* total num of packets during the
 115                                          * last TID_MAX_TIME_DIFF */
 116         u8 queue_count;                 /* number of queues that has
 117                                          * been used since the last cleanup */
 118         u8 head;                        /* start of the circular buffer */
 119 };
 120
 121 #endif /* CONFIG_IWL4965_HT */
 122
 123 /**
 124  * struct iwl4965_lq_sta -- driver's rate scaling private structure
 125  *
 126  * Pointer to this gets passed back and forth between driver and mac80211.
 127  */
 128 struct iwl4965_lq_sta {
 129         u8 active_tbl;          /* index of active table, range 0-1 */
 130         u8 enable_counter;      /* indicates HT mode */
 131         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 132         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 133         s32 last_tpt;
 134
 135         /* The following determine when to search for a new mode */
 136         u32 table_count_limit;
 137         u32 max_failure_limit;  /* # failed frames before new search */
 138         u32 max_success_limit;  /* # successful frames before new search */
 139         u32 table_count;
 140         u32 total_failed;       /* total failed frames, any/all rates */
 141         u32 total_success;      /* total successful frames, any/all rates */
 142         u32 flush_timer;        /* time staying in mode before new search */
 143
 144         u8 action_counter;      /* # mode-switch actions tried */
 145         u8 is_green;
 146         u8 is_dup;
 147         enum ieee80211_band band;
 148         u8 ibss_sta_added;
 149
 150         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 151         u32 supp_rates;
 152         u16 active_legacy_rate;
 153         u16 active_siso_rate;
 154         u16 active_mimo2_rate;
 155         u16 active_mimo3_rate;
 156         u16 active_rate_basic;
 157
 158         struct iwl_link_quality_cmd lq;
 159         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 160 #ifdef CONFIG_IWL4965_HT
 161         struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
 162         u8 tx_agg_tid_en;
 163 #endif
 164 #ifdef CONFIG_MAC80211_DEBUGFS
 165         struct dentry *rs_sta_dbgfs_scale_table_file;
 166         struct dentry *rs_sta_dbgfs_stats_table_file;
 167 #ifdef CONFIG_IWL4965_HT
 168         struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 169 #endif
 170         u32 dbg_fixed_rate;
 171 #endif
 172         struct iwl_priv *drv;
 173 };
 174
 175 static void rs_rate_scale_perform(struct iwl_priv *priv,
 176                                    struct net_device *dev,
 177                                    struct ieee80211_hdr *hdr,
 178                                    struct sta_info *sta);
 179 static void rs_fill_link_cmd(const struct iwl_priv *priv,
 180                              struct iwl4965_lq_sta *lq_sta,
 181                              u32 rate_n_flags);
 182
 183
 184 #ifdef CONFIG_MAC80211_DEBUGFS
 185 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 186                                         u32 *rate_n_flags, int index);
 187 #else
 188 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 189                                         u32 *rate_n_flags, int index)
 190 {}
 191 #endif
 192
 193 /*
 194  * Expected throughput metrics for following rates:
 195  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 196  * "G" is the only table that supports CCK (the first 4 rates).
 197  */
 198 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
 199 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 200         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 201 };
 202
 203 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 204         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 205 };
 206
 207 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 208         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 209 };
 210
 211 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 212         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 213 };
 214
 215 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 216         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 217 };
 218
 219 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 220         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 221 };
 222
 223 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 224         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 225 };
 226
 227 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 228         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 229 };
 230
 231 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 232         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 233 };
 234
 235 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 236         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 237 };
 238
 239 static inline u8 rs_extract_rate(u32 rate_n_flags)
 240 {
 241         return (u8)(rate_n_flags & 0xFF);
 242 }
 243
 244 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 245 {
 246         window->data = 0;
 247         window->success_counter = 0;
 248         window->success_ratio = IWL_INVALID_VALUE;
 249         window->counter = 0;
 250         window->average_tpt = IWL_INVALID_VALUE;
 251         window->stamp = 0;
 252 }
 253
 254 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 255 {
 256         return ((ant_type & valid_antenna) == ant_type);
 257 }
 258
 259 #ifdef CONFIG_IWL4965_HT
 260 /*
 261  *      removes the old data from the statistics. All data that is older than
 262  *      TID_MAX_TIME_DIFF, will be deleted.
 263  */
 264 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
 265 {
 266         /* The oldest age we want to keep */
 267         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 268
 269         while (tl->queue_count &&
 270                (tl->time_stamp < oldest_time)) {
 271                 tl->total -= tl->packet_count[tl->head];
 272                 tl->packet_count[tl->head] = 0;
 273                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 274                 tl->queue_count--;
 275                 tl->head++;
 276                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 277                         tl->head = 0;
 278         }
 279 }
 280
 281 /*
 282  *      increment traffic load value for tid and also remove
 283  *      any old values if passed the certain time period
 284  */
 285 static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data,
 286                              struct ieee80211_hdr *hdr)
 287 {
 288         u32 curr_time = jiffies_to_msecs(jiffies);
 289         u32 time_diff;
 290         s32 index;
 291         struct iwl4965_traffic_load *tl = NULL;
 292         u16 fc = le16_to_cpu(hdr->frame_control);
 293         u8 tid;
 294
 295         if (ieee80211_is_qos_data(fc)) {
 296                 u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
 297                 tid = qc[0] & 0xf;
 298         } else
 299                 return;
 300
 301         tl = &lq_data->load[tid];
 302
 303         curr_time -= curr_time % TID_ROUND_VALUE;
 304
 305         /* Happens only for the first packet. Initialize the data */
 306         if (!(tl->queue_count)) {
 307                 tl->total = 1;
 308                 tl->time_stamp = curr_time;
 309                 tl->queue_count = 1;
 310                 tl->head = 0;
 311                 tl->packet_count[0] = 1;
 312                 return;
 313         }
 314
 315         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 316         index = time_diff / TID_QUEUE_CELL_SPACING;
 317
 318         /* The history is too long: remove data that is older than */
 319         /* TID_MAX_TIME_DIFF */
 320         if (index >= TID_QUEUE_MAX_SIZE)
 321                 rs_tl_rm_old_stats(tl, curr_time);
 322
 323         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 324         tl->packet_count[index] = tl->packet_count[index] + 1;
 325         tl->total = tl->total + 1;
 326
 327         if ((index + 1) > tl->queue_count)
 328                 tl->queue_count = index + 1;
 329 }
 330
 331 /*
 332         get the traffic load value for tid
 333 */
 334 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
 335 {
 336         u32 curr_time = jiffies_to_msecs(jiffies);
 337         u32 time_diff;
 338         s32 index;
 339         struct iwl4965_traffic_load *tl = NULL;
 340
 341         if (tid >= TID_MAX_LOAD_COUNT)
 342                 return 0;
 343
 344         tl = &(lq_data->load[tid]);
 345
 346         curr_time -= curr_time % TID_ROUND_VALUE;
 347
 348         if (!(tl->queue_count))
 349                 return 0;
 350
 351         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 352         index = time_diff / TID_QUEUE_CELL_SPACING;
 353
 354         /* The history is too long: remove data that is older than */
 355         /* TID_MAX_TIME_DIFF */
 356         if (index >= TID_QUEUE_MAX_SIZE)
 357                 rs_tl_rm_old_stats(tl, curr_time);
 358
 359         return tl->total;
 360 }
 361
 362 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 363                                 struct iwl4965_lq_sta *lq_data, u8 tid,
 364                                 struct sta_info *sta)
 365 {
 366         unsigned long state;
 367         DECLARE_MAC_BUF(mac);
 368
 369         spin_lock_bh(&sta->lock);
 370         state = sta->ampdu_mlme.tid_state_tx[tid];
 371         spin_unlock_bh(&sta->lock);
 372
 373         if (state == HT_AGG_STATE_IDLE &&
 374             rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
 375                 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
 376                                 print_mac(mac, sta->addr), tid);
 377                 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
 378         }
 379 }
 380
 381 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 382                                 struct iwl4965_lq_sta *lq_data,
 383                                 struct sta_info *sta)
 384 {
 385         if ((tid < TID_MAX_LOAD_COUNT))
 386                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 387         else if (tid == IWL_AGG_ALL_TID)
 388                 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
 389                         rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 390 }
 391
 392 #endif /* CONFIG_IWLWIFI_HT */
 393
 394 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 395 {
 396         return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 397                 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 398                 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
 399 }
 400
 401 /**
 402  * rs_collect_tx_data - Update the success/failure sliding window
 403  *
 404  * We keep a sliding window of the last 62 packets transmitted
 405  * at this rate.  window->data contains the bitmask of successful
 406  * packets.
 407  */
 408 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 409                               int scale_index, s32 tpt, int retries,
 410                               int successes)
 411 {
 412         struct iwl4965_rate_scale_data *window = NULL;
 413         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 414         s32 fail_count;
 415
 416         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 417                 return -EINVAL;
 418
 419         /* Select data for current tx bit rate */
 420         window = &(windows[scale_index]);
 421
 422         /*
 423          * Keep track of only the latest 62 tx frame attempts in this rate's
 424          * history window; anything older isn't really relevant any more.
 425          * If we have filled up the sliding window, drop the oldest attempt;
 426          * if the oldest attempt (highest bit in bitmap) shows "success",
 427          * subtract "1" from the success counter (this is the main reason
 428          * we keep these bitmaps!).
 429          */
 430         while (retries > 0) {
 431                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 432
 433                         /* remove earliest */
 434                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 435
 436                         if (window->data & mask) {
 437                                 window->data &= ~mask;
 438                                 window->success_counter--;
 439                         }
 440                 }
 441
 442                 /* Increment frames-attempted counter */
 443                 window->counter++;
 444
 445                 /* Shift bitmap by one frame (throw away oldest history),
 446                  * OR in "1", and increment "success" if this
 447                  * frame was successful. */
 448                 window->data <<= 1;;
 449                 if (successes > 0) {
 450                         window->success_counter++;
 451                         window->data |= 0x1;
 452                         successes--;
 453                 }
 454
 455                 retries--;
 456         }
 457
 458         /* Calculate current success ratio, avoid divide-by-0! */
 459         if (window->counter > 0)
 460                 window->success_ratio = 128 * (100 * window->success_counter)
 461                                         / window->counter;
 462         else
 463                 window->success_ratio = IWL_INVALID_VALUE;
 464
 465         fail_count = window->counter - window->success_counter;
 466
 467         /* Calculate average throughput, if we have enough history. */
 468         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 469             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 470                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 471         else
 472                 window->average_tpt = IWL_INVALID_VALUE;
 473
 474         /* Tag this window as having been updated */
 475         window->stamp = jiffies;
 476
 477         return 0;
 478 }
 479
 480 /*
 481  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 482  */
 483 /* FIXME:RS:remove this function and put the flags statically in the table */
 484 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
 485                                        int index, u8 use_green)
 486 {
 487         u32 rate_n_flags = 0;
 488
 489         if (is_legacy(tbl->lq_type)) {
 490                 rate_n_flags = iwl_rates[index].plcp;
 491                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 492                         rate_n_flags |= RATE_MCS_CCK_MSK;
 493
 494         } else if (is_Ht(tbl->lq_type)) {
 495                 if (index > IWL_LAST_OFDM_RATE) {
 496                         IWL_ERROR("invalid HT rate index %d\n", index);
 497                         index = IWL_LAST_OFDM_RATE;
 498                 }
 499                 rate_n_flags = RATE_MCS_HT_MSK;
 500
 501                 if (is_siso(tbl->lq_type))
 502                         rate_n_flags |= iwl_rates[index].plcp_siso;
 503                 else if (is_mimo2(tbl->lq_type))
 504                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 505                 else
 506                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 507         } else {
 508                 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
 509         }
 510
 511         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 512                                                      RATE_MCS_ANT_ABC_MSK);
 513
 514         if (is_Ht(tbl->lq_type)) {
 515                 if (tbl->is_fat) {
 516                         if (tbl->is_dup)
 517                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 518                         else
 519                                 rate_n_flags |= RATE_MCS_FAT_MSK;
 520                 }
 521                 if (tbl->is_SGI)
 522                         rate_n_flags |= RATE_MCS_SGI_MSK;
 523
 524                 if (use_green) {
 525                         rate_n_flags |= RATE_MCS_GF_MSK;
 526                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 527                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 528                                 IWL_ERROR("GF was set with SGI:SISO\n");
 529                         }
 530                 }
 531         }
 532         return rate_n_flags;
 533 }
 534
 535 /*
 536  * Interpret uCode API's rate_n_flags format,
 537  * fill "search" or "active" tx mode table.
 538  */
 539 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 540                                     enum ieee80211_band band,
 541                                     struct iwl4965_scale_tbl_info *tbl,
 542                                     int *rate_idx)
 543 {
 544         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 545         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 546         u8 mcs;
 547
 548         *rate_idx = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 549
 550         if (*rate_idx  == IWL_RATE_INVALID) {
 551                 *rate_idx = -1;
 552                 return -EINVAL;
 553         }
 554         tbl->is_SGI = 0;        /* default legacy setup */
 555         tbl->is_fat = 0;
 556         tbl->is_dup = 0;
 557         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 558         tbl->lq_type = LQ_NONE;
 559
 560         /* legacy rate format */
 561         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 562                 if (num_of_ant == 1) {
 563                         if (band == IEEE80211_BAND_5GHZ)
 564                                 tbl->lq_type = LQ_A;
 565                         else
 566                                 tbl->lq_type = LQ_G;
 567                 }
 568         /* HT rate format */
 569         } else {
 570                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 571                         tbl->is_SGI = 1;
 572
 573                 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
 574                     (rate_n_flags & RATE_MCS_DUP_MSK))
 575                         tbl->is_fat = 1;
 576
 577                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 578                         tbl->is_dup = 1;
 579
 580                 mcs = rs_extract_rate(rate_n_flags);
 581
 582                 /* SISO */
 583                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 584                         if (num_of_ant == 1)
 585                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 586                 /* MIMO2 */
 587                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 588                         if (num_of_ant == 2)
 589                                 tbl->lq_type = LQ_MIMO2;
 590                 /* MIMO3 */
 591                 } else {
 592                         if (num_of_ant == 3)
 593                                 tbl->lq_type = LQ_MIMO3;
 594                 }
 595         }
 596         return 0;
 597 }
 598
 599 /* switch to another antenna/antennas and return 1 */
 600 /* if no other valid antenna found, return 0 */
 601 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 602                               struct iwl4965_scale_tbl_info *tbl)
 603 {
 604         u8 new_ant_type;
 605
 606         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 607                 return 0;
 608
 609         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 610                 return 0;
 611
 612         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 613
 614         while ((new_ant_type != tbl->ant_type) &&
 615                !rs_is_valid_ant(valid_ant, new_ant_type))
 616                 new_ant_type = ant_toggle_lookup[new_ant_type];
 617
 618         if (new_ant_type == tbl->ant_type)
 619                 return 0;
 620
 621         tbl->ant_type = new_ant_type;
 622         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 623         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 624         return 1;
 625 }
 626
 627 /* FIXME:RS: in 4965 we don't use greenfield at all */
 628 /* FIXME:RS: don't use greenfield for now in TX */
 629 /* #ifdef CONFIG_IWL4965_HT */
 630 #if 0
 631 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 632 {
 633         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 634                 priv->current_ht_config.is_green_field &&
 635                 !priv->current_ht_config.non_GF_STA_present);
 636 }
 637 #else
 638 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
 639 {
 640         return 0;
 641 }
 642 #endif  /* CONFIG_IWL4965_HT */
 643
 644 /**
 645  * rs_get_supported_rates - get the available rates
 646  *
 647  * if management frame or broadcast frame only return
 648  * basic available rates.
 649  *
 650  */
 651 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 652                                    struct ieee80211_hdr *hdr,
 653                                    enum iwl_table_type rate_type)
 654 {
 655         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 656             lq_sta->active_rate_basic)
 657                 return lq_sta->active_rate_basic;
 658
 659         if (is_legacy(rate_type)) {
 660                 return lq_sta->active_legacy_rate;
 661         } else {
 662                 if (is_siso(rate_type))
 663                         return lq_sta->active_siso_rate;
 664                 else if (is_mimo2(rate_type))
 665                         return lq_sta->active_mimo2_rate;
 666                 else
 667                         return lq_sta->active_mimo3_rate;
 668         }
 669 }
 670
 671 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 672                                 int rate_type)
 673 {
 674         u8 high = IWL_RATE_INVALID;
 675         u8 low = IWL_RATE_INVALID;
 676
 677         /* 802.11A or ht walks to the next literal adjacent rate in
 678          * the rate table */
 679         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 680                 int i;
 681                 u32 mask;
 682
 683                 /* Find the previous rate that is in the rate mask */
 684                 i = index - 1;
 685                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 686                         if (rate_mask & mask) {
 687                                 low = i;
 688                                 break;
 689                         }
 690                 }
 691
 692                 /* Find the next rate that is in the rate mask */
 693                 i = index + 1;
 694                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 695                         if (rate_mask & mask) {
 696                                 high = i;
 697                                 break;
 698                         }
 699                 }
 700
 701                 return (high << 8) | low;
 702         }
 703
 704         low = index;
 705         while (low != IWL_RATE_INVALID) {
 706                 low = iwl_rates[low].prev_rs;
 707                 if (low == IWL_RATE_INVALID)
 708                         break;
 709                 if (rate_mask & (1 << low))
 710                         break;
 711                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 712         }
 713
 714         high = index;
 715         while (high != IWL_RATE_INVALID) {
 716                 high = iwl_rates[high].next_rs;
 717                 if (high == IWL_RATE_INVALID)
 718                         break;
 719                 if (rate_mask & (1 << high))
 720                         break;
 721                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 722         }
 723
 724         return (high << 8) | low;
 725 }
 726
 727 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 728                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 729                              u8 ht_possible)
 730 {
 731         s32 low;
 732         u16 rate_mask;
 733         u16 high_low;
 734         u8 switch_to_legacy = 0;
 735         u8 is_green = lq_sta->is_green;
 736
 737         /* check if we need to switch from HT to legacy rates.
 738          * assumption is that mandatory rates (1Mbps or 6Mbps)
 739          * are always supported (spec demand) */
 740         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 741                 switch_to_legacy = 1;
 742                 scale_index = rs_ht_to_legacy[scale_index];
 743                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 744                         tbl->lq_type = LQ_A;
 745                 else
 746                         tbl->lq_type = LQ_G;
 747
 748                 if (num_of_ant(tbl->ant_type) > 1)
 749                         tbl->ant_type = ANT_A;/*FIXME:RS*/
 750
 751                 tbl->is_fat = 0;
 752                 tbl->is_SGI = 0;
 753         }
 754
 755         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 756
 757         /* Mask with station rate restriction */
 758         if (is_legacy(tbl->lq_type)) {
 759                 /* supp_rates has no CCK bits in A mode */
 760                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 761                         rate_mask  = (u16)(rate_mask &
 762                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 763                 else
 764                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 765         }
 766
 767         /* If we switched from HT to legacy, check current rate */
 768         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 769                 low = scale_index;
 770                 goto out;
 771         }
 772
 773         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 774                                         tbl->lq_type);
 775         low = high_low & 0xff;
 776
 777         if (low == IWL_RATE_INVALID)
 778                 low = scale_index;
 779
 780 out:
 781         return rate_n_flags_from_tbl(tbl, low, is_green);
 782 }
 783
 784 /*
 785  * mac80211 sends us Tx status
 786  */
 787 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 788                          struct sk_buff *skb)
 789 {
 790         int status;
 791         u8 retries;
 792         int rs_index, index = 0;
 793         struct iwl4965_lq_sta *lq_sta;
 794         struct iwl_link_quality_cmd *table;
 795         struct sta_info *sta;
 796         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 797         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 798         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 799         struct ieee80211_hw *hw = local_to_hw(local);
 800         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 801         struct iwl4965_rate_scale_data *window = NULL;
 802         struct iwl4965_rate_scale_data *search_win = NULL;
 803         u32 tx_rate;
 804         struct iwl4965_scale_tbl_info tbl_type;
 805         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 806         u8 active_index = 0;
 807         u16 fc = le16_to_cpu(hdr->frame_control);
 808         s32 tpt = 0;
 809
 810         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 811
 812         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 813                 return;
 814
 815         /* This packet was aggregated but doesn't carry rate scale info */
 816         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 817             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 818                 return;
 819
 820         retries = info->status.retry_count;
 821
 822         if (retries > 15)
 823                 retries = 15;
 824
 825         rcu_read_lock();
 826
 827         sta = sta_info_get(local, hdr->addr1);
 828
 829         if (!sta || !sta->rate_ctrl_priv)
 830                 goto out;
 831
 832
 833         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 834
 835         if (!priv->lq_mngr.lq_ready)
 836                 goto out;
 837
 838         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 839             !lq_sta->ibss_sta_added)
 840                 goto out;
 841
 842         table = &lq_sta->lq;
 843         active_index = lq_sta->active_tbl;
 844
 845         curr_tbl = &(lq_sta->lq_info[active_index]);
 846         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 847         window = (struct iwl4965_rate_scale_data *)
 848             &(curr_tbl->win[0]);
 849         search_win = (struct iwl4965_rate_scale_data *)
 850             &(search_tbl->win[0]);
 851
 852         /*
 853          * Ignore this Tx frame response if its initial rate doesn't match
 854          * that of latest Link Quality command.  There may be stragglers
 855          * from a previous Link Quality command, but we're no longer interested
 856          * in those; they're either from the "active" mode while we're trying
 857          * to check "search" mode, or a prior "search" mode after we've moved
 858          * to a new "search" mode (which might become the new "active" mode).
 859          */
 860         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 861         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 862         if (priv->band == IEEE80211_BAND_5GHZ)
 863                 rs_index -= IWL_FIRST_OFDM_RATE;
 864
 865         if ((info->tx_rate_idx < 0) ||
 866             (tbl_type.is_SGI ^
 867                 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
 868             (tbl_type.is_fat ^
 869                 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
 870             (tbl_type.is_dup ^
 871                 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
 872             (tbl_type.ant_type ^ info->antenna_sel_tx) ||
 873             (!!(tx_rate & RATE_MCS_HT_MSK) ^
 874                 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
 875             (!!(tx_rate & RATE_MCS_GF_MSK) ^
 876                 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
 877             (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
 878              hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
 879                 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
 880                 goto out;
 881         }
 882
 883         /* Update frame history window with "failure" for each Tx retry. */
 884         while (retries) {
 885                 /* Look up the rate and other info used for each tx attempt.
 886                  * Each tx attempt steps one entry deeper in the rate table. */
 887                 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 888                 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
 889                                           &tbl_type, &rs_index);
 890
 891                 /* If type matches "search" table,
 892                  * add failure to "search" history */
 893                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 894                     (tbl_type.ant_type == search_tbl->ant_type) &&
 895                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 896                         if (search_tbl->expected_tpt)
 897                                 tpt = search_tbl->expected_tpt[rs_index];
 898                         else
 899                                 tpt = 0;
 900                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 901
 902                 /* Else if type matches "current/active" table,
 903                  * add failure to "current/active" history */
 904                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 905                            (tbl_type.ant_type == curr_tbl->ant_type) &&
 906                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 907                         if (curr_tbl->expected_tpt)
 908                                 tpt = curr_tbl->expected_tpt[rs_index];
 909                         else
 910                                 tpt = 0;
 911                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 912                 }
 913
 914                 /* If not searching for a new mode, increment failed counter
 915                  * ... this helps determine when to start searching again */
 916                 if (lq_sta->stay_in_tbl)
 917                         lq_sta->total_failed++;
 918                 --retries;
 919                 index++;
 920
 921         }
 922
 923         /*
 924          * Find (by rate) the history window to update with final Tx attempt;
 925          * if Tx was successful first try, use original rate,
 926          * else look up the rate that was, finally, successful.
 927          */
 928         tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
 929         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 930
 931         /* Update frame history window with "success" if Tx got ACKed ... */
 932         status = !!(info->flags & IEEE80211_TX_STAT_ACK);
 933
 934         /* If type matches "search" table,
 935          * add final tx status to "search" history */
 936         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 937             (tbl_type.ant_type == search_tbl->ant_type) &&
 938             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 939                 if (search_tbl->expected_tpt)
 940                         tpt = search_tbl->expected_tpt[rs_index];
 941                 else
 942                         tpt = 0;
 943                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 944                         rs_collect_tx_data(search_win, rs_index, tpt,
 945                                            info->status.ampdu_ack_len,
 946                                            info->status.ampdu_ack_map);
 947                 else
 948                         rs_collect_tx_data(search_win, rs_index, tpt,
 949                                            1, status);
 950         /* Else if type matches "current/active" table,
 951          * add final tx status to "current/active" history */
 952         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 953                    (tbl_type.ant_type == curr_tbl->ant_type) &&
 954                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 955                 if (curr_tbl->expected_tpt)
 956                         tpt = curr_tbl->expected_tpt[rs_index];
 957                 else
 958                         tpt = 0;
 959                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 960                         rs_collect_tx_data(window, rs_index, tpt,
 961                                            info->status.ampdu_ack_len,
 962                                            info->status.ampdu_ack_map);
 963                 else
 964                         rs_collect_tx_data(window, rs_index, tpt,
 965                                            1, status);
 966         }
 967
 968         /* If not searching for new mode, increment success/failed counter
 969          * ... these help determine when to start searching again */
 970         if (lq_sta->stay_in_tbl) {
 971                 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
 972                         lq_sta->total_success += info->status.ampdu_ack_map;
 973                         lq_sta->total_failed +=
 974                              (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
 975                 } else {
 976                         if (status)
 977                                 lq_sta->total_success++;
 978                         else
 979                                 lq_sta->total_failed++;
 980                 }
 981         }
 982
 983         /* See if there's a better rate or modulation mode to try. */
 984         rs_rate_scale_perform(priv, dev, hdr, sta);
 985 out:
 986         rcu_read_unlock();
 987         return;
 988 }
 989
 990 /*
 991  * Begin a period of staying with a selected modulation mode.
 992  * Set "stay_in_tbl" flag to prevent any mode switches.
 993  * Set frame tx success limits according to legacy vs. high-throughput,
 994  * and reset overall (spanning all rates) tx success history statistics.
 995  * These control how long we stay using same modulation mode before
 996  * searching for a new mode.
 997  */
 998 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
 999                                  struct iwl4965_lq_sta *lq_sta)
1000 {
1001         IWL_DEBUG_RATE("we are staying in the same table\n");
1002         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1003         if (is_legacy) {
1004                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1005                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1006                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1007         } else {
1008                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1009                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1010                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1011         }
1012         lq_sta->table_count = 0;
1013         lq_sta->total_failed = 0;
1014         lq_sta->total_success = 0;
1015 }
1016
1017 /*
1018  * Find correct throughput table for given mode of modulation
1019  */
1020 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1021                                       struct iwl4965_scale_tbl_info *tbl)
1022 {
1023         if (is_legacy(tbl->lq_type)) {
1024                 if (!is_a_band(tbl->lq_type))
1025                         tbl->expected_tpt = expected_tpt_G;
1026                 else
1027                         tbl->expected_tpt = expected_tpt_A;
1028         } else if (is_siso(tbl->lq_type)) {
1029                 if (tbl->is_fat && !lq_sta->is_dup)
1030                         if (tbl->is_SGI)
1031                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1032                         else
1033                                 tbl->expected_tpt = expected_tpt_siso40MHz;
1034                 else if (tbl->is_SGI)
1035                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1036                 else
1037                         tbl->expected_tpt = expected_tpt_siso20MHz;
1038
1039         } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1040                 if (tbl->is_fat && !lq_sta->is_dup)
1041                         if (tbl->is_SGI)
1042                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1043                         else
1044                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
1045                 else if (tbl->is_SGI)
1046                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1047                 else
1048                         tbl->expected_tpt = expected_tpt_mimo20MHz;
1049         } else
1050                 tbl->expected_tpt = expected_tpt_G;
1051 }
1052
1053 #ifdef CONFIG_IWL4965_HT
1054 /*
1055  * Find starting rate for new "search" high-throughput mode of modulation.
1056  * Goal is to find lowest expected rate (under perfect conditions) that is
1057  * above the current measured throughput of "active" mode, to give new mode
1058  * a fair chance to prove itself without too many challenges.
1059  *
1060  * This gets called when transitioning to more aggressive modulation
1061  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1062  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1063  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1064  * bit rate will typically need to increase, but not if performance was bad.
1065  */
1066 static s32 rs_get_best_rate(struct iwl_priv *priv,
1067                             struct iwl4965_lq_sta *lq_sta,
1068                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
1069                             u16 rate_mask, s8 index)
1070 {
1071         /* "active" values */
1072         struct iwl4965_scale_tbl_info *active_tbl =
1073             &(lq_sta->lq_info[lq_sta->active_tbl]);
1074         s32 active_sr = active_tbl->win[index].success_ratio;
1075         s32 active_tpt = active_tbl->expected_tpt[index];
1076
1077         /* expected "search" throughput */
1078         s32 *tpt_tbl = tbl->expected_tpt;
1079
1080         s32 new_rate, high, low, start_hi;
1081         u16 high_low;
1082         s8 rate = index;
1083
1084         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1085
1086         for (; ;) {
1087                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1088                                                 tbl->lq_type);
1089
1090                 low = high_low & 0xff;
1091                 high = (high_low >> 8) & 0xff;
1092
1093                 /*
1094                  * Lower the "search" bit rate, to give new "search" mode
1095                  * approximately the same throughput as "active" if:
1096                  *
1097                  * 1) "Active" mode has been working modestly well (but not
1098                  *    great), and expected "search" throughput (under perfect
1099                  *    conditions) at candidate rate is above the actual
1100                  *    measured "active" throughput (but less than expected
1101                  *    "active" throughput under perfect conditions).
1102                  * OR
1103                  * 2) "Active" mode has been working perfectly or very well
1104                  *    and expected "search" throughput (under perfect
1105                  *    conditions) at candidate rate is above expected
1106                  *    "active" throughput (under perfect conditions).
1107                  */
1108                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1109                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1110                       (active_sr <= IWL_RATE_HIGH_TH) &&
1111                       (tpt_tbl[rate] <= active_tpt))) ||
1112                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1113                      (tpt_tbl[rate] > active_tpt))) {
1114
1115                         /* (2nd or later pass)
1116                          * If we've already tried to raise the rate, and are
1117                          * now trying to lower it, use the higher rate. */
1118                         if (start_hi != IWL_RATE_INVALID) {
1119                                 new_rate = start_hi;
1120                                 break;
1121                         }
1122
1123                         new_rate = rate;
1124
1125                         /* Loop again with lower rate */
1126                         if (low != IWL_RATE_INVALID)
1127                                 rate = low;
1128
1129                         /* Lower rate not available, use the original */
1130                         else
1131                                 break;
1132
1133                 /* Else try to raise the "search" rate to match "active" */
1134                 } else {
1135                         /* (2nd or later pass)
1136                          * If we've already tried to lower the rate, and are
1137                          * now trying to raise it, use the lower rate. */
1138                         if (new_rate != IWL_RATE_INVALID)
1139                                 break;
1140
1141                         /* Loop again with higher rate */
1142                         else if (high != IWL_RATE_INVALID) {
1143                                 start_hi = high;
1144                                 rate = high;
1145
1146                         /* Higher rate not available, use the original */
1147                         } else {
1148                                 break;
1149                         }
1150                 }
1151         }
1152
1153         return new_rate;
1154 }
1155 #endif                          /* CONFIG_IWL4965_HT */
1156
1157 /*
1158  * Set up search table for MIMO
1159  */
1160 #ifdef CONFIG_IWL4965_HT
1161 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1162                              struct iwl4965_lq_sta *lq_sta,
1163                              struct ieee80211_conf *conf,
1164                              struct sta_info *sta,
1165                              struct iwl4965_scale_tbl_info *tbl, int index)
1166 {
1167         u16 rate_mask;
1168         s32 rate;
1169         s8 is_green = lq_sta->is_green;
1170
1171         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1172             !sta->ht_info.ht_supported)
1173                 return -1;
1174
1175         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1176                 return -1;
1177
1178         /* Need both Tx chains/antennas to support MIMO */
1179         if (priv->hw_params.tx_chains_num < 2)
1180                 return -1;
1181
1182         IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1183
1184         tbl->lq_type = LQ_MIMO2;
1185         tbl->is_dup = lq_sta->is_dup;
1186         tbl->action = 0;
1187         rate_mask = lq_sta->active_mimo2_rate;
1188
1189         if (priv->current_ht_config.supported_chan_width
1190                                         == IWL_CHANNEL_WIDTH_40MHZ)
1191                 tbl->is_fat = 1;
1192         else
1193                 tbl->is_fat = 0;
1194
1195         /* FIXME: - don't toggle SGI here
1196         if (tbl->is_fat) {
1197                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1198                         tbl->is_SGI = 1;
1199                 else
1200                         tbl->is_SGI = 0;
1201         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1202                 tbl->is_SGI = 1;
1203         else
1204                 tbl->is_SGI = 0;
1205         */
1206
1207         rs_set_expected_tpt_table(lq_sta, tbl);
1208
1209         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1210
1211         IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1212
1213         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1214                 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1215                                                 rate, rate_mask);
1216                 return -1;
1217         }
1218         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1219
1220         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1221                      tbl->current_rate, is_green);
1222         return 0;
1223 }
1224 #else
1225 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1226                              struct iwl4965_lq_sta *lq_sta,
1227                              struct ieee80211_conf *conf,
1228                              struct sta_info *sta,
1229                              struct iwl4965_scale_tbl_info *tbl, int index)
1230 {
1231         return -1;
1232 }
1233 #endif  /*CONFIG_IWL4965_HT */
1234
1235 /*
1236  * Set up search table for SISO
1237  */
1238 static int rs_switch_to_siso(struct iwl_priv *priv,
1239                              struct iwl4965_lq_sta *lq_sta,
1240                              struct ieee80211_conf *conf,
1241                              struct sta_info *sta,
1242                              struct iwl4965_scale_tbl_info *tbl, int index)
1243 {
1244 #ifdef CONFIG_IWL4965_HT
1245         u16 rate_mask;
1246         u8 is_green = lq_sta->is_green;
1247         s32 rate;
1248
1249         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1250             !sta->ht_info.ht_supported)
1251                 return -1;
1252
1253         IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1254
1255         tbl->is_dup = lq_sta->is_dup;
1256         tbl->lq_type = LQ_SISO;
1257         tbl->action = 0;
1258         rate_mask = lq_sta->active_siso_rate;
1259
1260         if (priv->current_ht_config.supported_chan_width
1261             == IWL_CHANNEL_WIDTH_40MHZ)
1262                 tbl->is_fat = 1;
1263         else
1264                 tbl->is_fat = 0;
1265
1266         /* FIXME: - don't toggle SGI here
1267         if (tbl->is_fat) {
1268                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1269                         tbl->is_SGI = 1;
1270                 else
1271                         tbl->is_SGI = 0;
1272         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1273                 tbl->is_SGI = 1;
1274         else
1275                 tbl->is_SGI = 0;
1276         */
1277
1278         if (is_green)
1279                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1280
1281         rs_set_expected_tpt_table(lq_sta, tbl);
1282         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1283
1284         IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1285         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1286                 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1287                              rate, rate_mask);
1288                 return -1;
1289         }
1290         tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1291         IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1292                      tbl->current_rate, is_green);
1293         return 0;
1294 #else
1295         return -1;
1296 #endif  /*CONFIG_IWL4965_HT */
1297 }
1298
1299 /*
1300  * Try to switch to new modulation mode from legacy
1301  */
1302 static int rs_move_legacy_other(struct iwl_priv *priv,
1303                                 struct iwl4965_lq_sta *lq_sta,
1304                                 struct ieee80211_conf *conf,
1305                                 struct sta_info *sta,
1306                                 int index)
1307 {
1308         struct iwl4965_scale_tbl_info *tbl =
1309             &(lq_sta->lq_info[lq_sta->active_tbl]);
1310         struct iwl4965_scale_tbl_info *search_tbl =
1311             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1312         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1313         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1314                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1315         u8 start_action = tbl->action;
1316         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1317         int ret = 0;
1318
1319         for (; ;) {
1320                 switch (tbl->action) {
1321                 case IWL_LEGACY_SWITCH_ANTENNA:
1322                         IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1323
1324                         lq_sta->action_counter++;
1325
1326                         /* Don't change antenna if success has been great */
1327                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1328                                 break;
1329
1330                         /* Set up search table to try other antenna */
1331                         memcpy(search_tbl, tbl, sz);
1332
1333                         if (rs_toggle_antenna(valid_tx_ant,
1334                                 &search_tbl->current_rate, search_tbl)) {
1335                                 lq_sta->search_better_tbl = 1;
1336                                 goto out;
1337                         }
1338                         break;
1339                 case IWL_LEGACY_SWITCH_SISO:
1340                         IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1341
1342                         /* Set up search table to try SISO */
1343                         memcpy(search_tbl, tbl, sz);
1344                         search_tbl->is_SGI = 0;
1345                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1346                                                  search_tbl, index);
1347                         if (!ret) {
1348                                 lq_sta->search_better_tbl = 1;
1349                                 lq_sta->action_counter = 0;
1350                                 goto out;
1351                         }
1352
1353                         break;
1354                 case IWL_LEGACY_SWITCH_MIMO2:
1355                         IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1356
1357                         /* Set up search table to try MIMO */
1358                         memcpy(search_tbl, tbl, sz);
1359                         search_tbl->is_SGI = 0;
1360                         search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1361                                 /*FIXME:RS:need to check ant validity*/
1362                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1363                                                  search_tbl, index);
1364                         if (!ret) {
1365                                 lq_sta->search_better_tbl = 1;
1366                                 lq_sta->action_counter = 0;
1367                                 goto out;
1368                         }
1369                         break;
1370                 }
1371                 tbl->action++;
1372                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1373                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1374
1375                 if (tbl->action == start_action)
1376                         break;
1377
1378         }
1379         return 0;
1380
1381  out:
1382         tbl->action++;
1383         if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1384                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1385         return 0;
1386
1387 }
1388
1389 /*
1390  * Try to switch to new modulation mode from SISO
1391  */
1392 static int rs_move_siso_to_other(struct iwl_priv *priv,
1393                                  struct iwl4965_lq_sta *lq_sta,
1394                                  struct ieee80211_conf *conf,
1395                                  struct sta_info *sta,
1396                                  int index)
1397 {
1398         u8 is_green = lq_sta->is_green;
1399         struct iwl4965_scale_tbl_info *tbl =
1400             &(lq_sta->lq_info[lq_sta->active_tbl]);
1401         struct iwl4965_scale_tbl_info *search_tbl =
1402             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1403         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1404         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1405                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1406         u8 start_action = tbl->action;
1407         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1408         int ret;
1409
1410         for (;;) {
1411                 lq_sta->action_counter++;
1412                 switch (tbl->action) {
1413                 case IWL_SISO_SWITCH_ANTENNA:
1414                         IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1415                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1416                                 break;
1417
1418                         memcpy(search_tbl, tbl, sz);
1419                         if (rs_toggle_antenna(valid_tx_ant,
1420                                        &search_tbl->current_rate, search_tbl)) {
1421                                 lq_sta->search_better_tbl = 1;
1422                                 goto out;
1423                         }
1424                         break;
1425                 case IWL_SISO_SWITCH_MIMO2:
1426                         IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1427                         memcpy(search_tbl, tbl, sz);
1428                         search_tbl->is_SGI = 0;
1429                         search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1430                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1431                                                  search_tbl, index);
1432                         if (!ret) {
1433                                 lq_sta->search_better_tbl = 1;
1434                                 goto out;
1435                         }
1436                         break;
1437                 case IWL_SISO_SWITCH_GI:
1438                         if (!tbl->is_fat &&
1439                                 !(priv->current_ht_config.sgf &
1440                                                 HT_SHORT_GI_20MHZ))
1441                                 break;
1442                         if (tbl->is_fat &&
1443                                 !(priv->current_ht_config.sgf &
1444                                                 HT_SHORT_GI_40MHZ))
1445                                 break;
1446
1447                         IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1448
1449                         memcpy(search_tbl, tbl, sz);
1450                         if (is_green) {
1451                                 if (!tbl->is_SGI)
1452                                         break;
1453                                 else
1454                                         IWL_ERROR("SGI was set in GF+SISO\n");
1455                         }
1456                         search_tbl->is_SGI = !tbl->is_SGI;
1457                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1458                         if (tbl->is_SGI) {
1459                                 s32 tpt = lq_sta->last_tpt / 100;
1460                                 if (tpt >= search_tbl->expected_tpt[index])
1461                                         break;
1462                         }
1463                         search_tbl->current_rate = rate_n_flags_from_tbl(
1464                                                 search_tbl, index, is_green);
1465                         lq_sta->search_better_tbl = 1;
1466                         goto out;
1467                 }
1468                 tbl->action++;
1469                 if (tbl->action > IWL_SISO_SWITCH_GI)
1470                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1471
1472                 if (tbl->action == start_action)
1473                         break;
1474         }
1475         return 0;
1476
1477  out:
1478         tbl->action++;
1479         if (tbl->action > IWL_SISO_SWITCH_GI)
1480                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1481         return 0;
1482 }
1483
1484 /*
1485  * Try to switch to new modulation mode from MIMO
1486  */
1487 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1488                                  struct iwl4965_lq_sta *lq_sta,
1489                                  struct ieee80211_conf *conf,
1490                                  struct sta_info *sta,
1491                                  int index)
1492 {
1493         s8 is_green = lq_sta->is_green;
1494         struct iwl4965_scale_tbl_info *tbl =
1495             &(lq_sta->lq_info[lq_sta->active_tbl]);
1496         struct iwl4965_scale_tbl_info *search_tbl =
1497             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1498         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1499                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1500         u8 start_action = tbl->action;
1501         /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1502         int ret;
1503
1504         for (;;) {
1505                 lq_sta->action_counter++;
1506                 switch (tbl->action) {
1507                 case IWL_MIMO_SWITCH_ANTENNA_A:
1508                 case IWL_MIMO_SWITCH_ANTENNA_B:
1509                         IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1510
1511                         /* Set up new search table for SISO */
1512                         memcpy(search_tbl, tbl, sz);
1513
1514                         /*FIXME:RS:need to check ant validity + C*/
1515                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1516                                 search_tbl->ant_type = ANT_A;
1517                         else
1518                                 search_tbl->ant_type = ANT_B;
1519
1520                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1521                                                  search_tbl, index);
1522                         if (!ret) {
1523                                 lq_sta->search_better_tbl = 1;
1524                                 goto out;
1525                         }
1526                         break;
1527
1528                 case IWL_MIMO_SWITCH_GI:
1529                         if (!tbl->is_fat &&
1530                                 !(priv->current_ht_config.sgf &
1531                                                 HT_SHORT_GI_20MHZ))
1532                                 break;
1533                         if (tbl->is_fat &&
1534                                 !(priv->current_ht_config.sgf &
1535                                                 HT_SHORT_GI_40MHZ))
1536                                 break;
1537
1538                         IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1539
1540                         /* Set up new search table for MIMO */
1541                         memcpy(search_tbl, tbl, sz);
1542                         search_tbl->is_SGI = !tbl->is_SGI;
1543                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1544                         /*
1545                          * If active table already uses the fastest possible
1546                          * modulation (dual stream with short guard interval),
1547                          * and it's working well, there's no need to look
1548                          * for a better type of modulation!
1549                          */
1550                         if (tbl->is_SGI) {
1551                                 s32 tpt = lq_sta->last_tpt / 100;
1552                                 if (tpt >= search_tbl->expected_tpt[index])
1553                                         break;
1554                         }
1555                         search_tbl->current_rate = rate_n_flags_from_tbl(
1556                                                 search_tbl, index, is_green);
1557                         lq_sta->search_better_tbl = 1;
1558                         goto out;
1559
1560                 }
1561                 tbl->action++;
1562                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1563                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1564
1565                 if (tbl->action == start_action)
1566                         break;
1567         }
1568
1569         return 0;
1570  out:
1571         tbl->action++;
1572         if (tbl->action > IWL_MIMO_SWITCH_GI)
1573                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1574         return 0;
1575
1576 }
1577
1578 /*
1579  * Check whether we should continue using same modulation mode, or
1580  * begin search for a new mode, based on:
1581  * 1) # tx successes or failures while using this mode
1582  * 2) # times calling this function
1583  * 3) elapsed time in this mode (not used, for now)
1584  */
1585 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1586 {
1587         struct iwl4965_scale_tbl_info *tbl;
1588         int i;
1589         int active_tbl;
1590         int flush_interval_passed = 0;
1591         struct iwl_priv *priv;
1592
1593         priv = lq_sta->drv;
1594         active_tbl = lq_sta->active_tbl;
1595
1596         tbl = &(lq_sta->lq_info[active_tbl]);
1597
1598         /* If we've been disallowing search, see if we should now allow it */
1599         if (lq_sta->stay_in_tbl) {
1600
1601                 /* Elapsed time using current modulation mode */
1602                 if (lq_sta->flush_timer)
1603                         flush_interval_passed =
1604                             time_after(jiffies,
1605                                        (unsigned long)(lq_sta->flush_timer +
1606                                         IWL_RATE_SCALE_FLUSH_INTVL));
1607
1608                 /*
1609                  * Check if we should allow search for new modulation mode.
1610                  * If many frames have failed or succeeded, or we've used
1611                  * this same modulation for a long time, allow search, and
1612                  * reset history stats that keep track of whether we should
1613                  * allow a new search.  Also (below) reset all bitmaps and
1614                  * stats in active history.
1615                  */
1616                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1617                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1618                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1619                      && (flush_interval_passed))) {
1620                         IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1621                                      lq_sta->total_failed,
1622                                      lq_sta->total_success,
1623                                      flush_interval_passed);
1624
1625                         /* Allow search for new mode */
1626                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1627                         lq_sta->total_failed = 0;
1628                         lq_sta->total_success = 0;
1629                         lq_sta->flush_timer = 0;
1630
1631                 /*
1632                  * Else if we've used this modulation mode enough repetitions
1633                  * (regardless of elapsed time or success/failure), reset
1634                  * history bitmaps and rate-specific stats for all rates in
1635                  * active table.
1636                  */
1637                 } else {
1638                         lq_sta->table_count++;
1639                         if (lq_sta->table_count >=
1640                             lq_sta->table_count_limit) {
1641                                 lq_sta->table_count = 0;
1642
1643                                 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1644                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1645                                         rs_rate_scale_clear_window(
1646                                                 &(tbl->win[i]));
1647                         }
1648                 }
1649
1650                 /* If transitioning to allow "search", reset all history
1651                  * bitmaps and stats in active table (this will become the new
1652                  * "search" table). */
1653                 if (!lq_sta->stay_in_tbl) {
1654                         for (i = 0; i < IWL_RATE_COUNT; i++)
1655                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1656                 }
1657         }
1658 }
1659
1660 /*
1661  * Do rate scaling and search for new modulation mode.
1662  */
1663 static void rs_rate_scale_perform(struct iwl_priv *priv,
1664                                   struct net_device *dev,
1665                                   struct ieee80211_hdr *hdr,
1666                                   struct sta_info *sta)
1667 {
1668         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1669         struct ieee80211_hw *hw = local_to_hw(local);
1670         struct ieee80211_conf *conf = &hw->conf;
1671         int low = IWL_RATE_INVALID;
1672         int high = IWL_RATE_INVALID;
1673         int index;
1674         int i;
1675         struct iwl4965_rate_scale_data *window = NULL;
1676         int current_tpt = IWL_INVALID_VALUE;
1677         int low_tpt = IWL_INVALID_VALUE;
1678         int high_tpt = IWL_INVALID_VALUE;
1679         u32 fail_count;
1680         s8 scale_action = 0;
1681         u16 fc, rate_mask;
1682         u8 update_lq = 0;
1683         struct iwl4965_lq_sta *lq_sta;
1684         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1685         u16 rate_scale_index_msk = 0;
1686         u32 rate;
1687         u8 is_green = 0;
1688         u8 active_tbl = 0;
1689         u8 done_search = 0;
1690         u16 high_low;
1691         s32 sr;
1692 #ifdef CONFIG_IWL4965_HT
1693         u8 tid = MAX_TID_COUNT;
1694 #endif
1695
1696         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1697
1698         fc = le16_to_cpu(hdr->frame_control);
1699         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1700                 /* Send management frames and broadcast/multicast data using
1701                  * lowest rate. */
1702                 /* TODO: this could probably be improved.. */
1703                 return;
1704         }
1705
1706         if (!sta || !sta->rate_ctrl_priv)
1707                 return;
1708
1709         if (!priv->lq_mngr.lq_ready) {
1710                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1711                 return;
1712         }
1713         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1714
1715 #ifdef CONFIG_IWL4965_HT
1716         rs_tl_add_packet(lq_sta, hdr);
1717 #endif
1718         /*
1719          * Select rate-scale / modulation-mode table to work with in
1720          * the rest of this function:  "search" if searching for better
1721          * modulation mode, or "active" if doing rate scaling within a mode.
1722          */
1723         if (!lq_sta->search_better_tbl)
1724                 active_tbl = lq_sta->active_tbl;
1725         else
1726                 active_tbl = 1 - lq_sta->active_tbl;
1727
1728         tbl = &(lq_sta->lq_info[active_tbl]);
1729         is_green = lq_sta->is_green;
1730
1731         /* current tx rate */
1732         index = sta->last_txrate_idx;
1733
1734         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1735                        tbl->lq_type);
1736
1737         /* rates available for this association, and for modulation mode */
1738         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1739
1740         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1741
1742         /* mask with station rate restriction */
1743         if (is_legacy(tbl->lq_type)) {
1744                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1745                         /* supp_rates has no CCK bits in A mode */
1746                         rate_scale_index_msk = (u16) (rate_mask &
1747                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1748                 else
1749                         rate_scale_index_msk = (u16) (rate_mask &
1750                                                       lq_sta->supp_rates);
1751
1752         } else
1753                 rate_scale_index_msk = rate_mask;
1754
1755         if (!rate_scale_index_msk)
1756                 rate_scale_index_msk = rate_mask;
1757
1758         if (!((1 << index) & rate_scale_index_msk)) {
1759                 IWL_ERROR("Current Rate is not valid\n");
1760                 return;
1761         }
1762
1763         /* Get expected throughput table and history window for current rate */
1764         if (!tbl->expected_tpt) {
1765                 IWL_ERROR("tbl->expected_tpt is NULL\n");
1766                 return;
1767         }
1768
1769         window = &(tbl->win[index]);
1770
1771         /*
1772          * If there is not enough history to calculate actual average
1773          * throughput, keep analyzing results of more tx frames, without
1774          * changing rate or mode (bypass most of the rest of this function).
1775          * Set up new rate table in uCode only if old rate is not supported
1776          * in current association (use new rate found above).
1777          */
1778         fail_count = window->counter - window->success_counter;
1779         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1780                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1781                 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1782                                "for index %d\n",
1783                                window->success_counter, window->counter, index);
1784
1785                 /* Can't calculate this yet; not enough history */
1786                 window->average_tpt = IWL_INVALID_VALUE;
1787
1788                 /* Should we stay with this modulation mode,
1789                  * or search for a new one? */
1790                 rs_stay_in_table(lq_sta);
1791
1792                 goto out;
1793
1794         /* Else we have enough samples; calculate estimate of
1795          * actual average throughput */
1796         } else {
1797                 /*FIXME:RS remove this else if we don't get this error*/
1798                 if (window->average_tpt != ((window->success_ratio *
1799                                 tbl->expected_tpt[index] + 64) / 128)) {
1800                         IWL_ERROR("expected_tpt should have been calculated"
1801                                                                 " by now\n");
1802                         window->average_tpt = ((window->success_ratio *
1803                                         tbl->expected_tpt[index] + 64) / 128);
1804                 }
1805         }
1806
1807         /* If we are searching for better modulation mode, check success. */
1808         if (lq_sta->search_better_tbl) {
1809
1810                 /* If good success, continue using the "search" mode;
1811                  * no need to send new link quality command, since we're
1812                  * continuing to use the setup that we've been trying. */
1813                 if (window->average_tpt > lq_sta->last_tpt) {
1814
1815                         IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1816                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1817                                         window->success_ratio,
1818                                         window->average_tpt,
1819                                         lq_sta->last_tpt);
1820
1821                         if (!is_legacy(tbl->lq_type))
1822                                 lq_sta->enable_counter = 1;
1823
1824                         /* Swap tables; "search" becomes "active" */
1825                         lq_sta->active_tbl = active_tbl;
1826                         current_tpt = window->average_tpt;
1827
1828                 /* Else poor success; go back to mode in "active" table */
1829                 } else {
1830
1831                         IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1832                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
1833                                         window->success_ratio,
1834                                         window->average_tpt,
1835                                         lq_sta->last_tpt);
1836
1837                         /* Nullify "search" table */
1838                         tbl->lq_type = LQ_NONE;
1839
1840                         /* Revert to "active" table */
1841                         active_tbl = lq_sta->active_tbl;
1842                         tbl = &(lq_sta->lq_info[active_tbl]);
1843
1844                         /* Revert to "active" rate and throughput info */
1845                         index = iwl4965_hwrate_to_plcp_idx(
1846                                                         tbl->current_rate);
1847                         current_tpt = lq_sta->last_tpt;
1848
1849                         /* Need to set up a new rate table in uCode */
1850                         update_lq = 1;
1851                 }
1852
1853                 /* Either way, we've made a decision; modulation mode
1854                  * search is done, allow rate adjustment next time. */
1855                 lq_sta->search_better_tbl = 0;
1856                 done_search = 1;        /* Don't switch modes below! */
1857                 goto lq_update;
1858         }
1859
1860         /* (Else) not in search of better modulation mode, try for better
1861          * starting rate, while staying in this mode. */
1862         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1863                                         tbl->lq_type);
1864         low = high_low & 0xff;
1865         high = (high_low >> 8) & 0xff;
1866
1867         sr = window->success_ratio;
1868
1869         /* Collect measured throughputs for current and adjacent rates */
1870         current_tpt = window->average_tpt;
1871         if (low != IWL_RATE_INVALID)
1872                 low_tpt = tbl->win[low].average_tpt;
1873         if (high != IWL_RATE_INVALID)
1874                 high_tpt = tbl->win[high].average_tpt;
1875
1876         scale_action = 0;
1877
1878         /* Too many failures, decrease rate */
1879         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1880                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1881                 scale_action = -1;
1882
1883         /* No throughput measured yet for adjacent rates; try increase. */
1884         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1885                    (high_tpt == IWL_INVALID_VALUE)) {
1886
1887                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1888                         scale_action = 1;
1889                 else if (low != IWL_RATE_INVALID)
1890                         scale_action = -1;
1891         }
1892
1893         /* Both adjacent throughputs are measured, but neither one has better
1894          * throughput; we're using the best rate, don't change it! */
1895         else if ((low_tpt != IWL_INVALID_VALUE) &&
1896                  (high_tpt != IWL_INVALID_VALUE) &&
1897                  (low_tpt < current_tpt) &&
1898                  (high_tpt < current_tpt))
1899                 scale_action = 0;
1900
1901         /* At least one adjacent rate's throughput is measured,
1902          * and may have better performance. */
1903         else {
1904                 /* Higher adjacent rate's throughput is measured */
1905                 if (high_tpt != IWL_INVALID_VALUE) {
1906                         /* Higher rate has better throughput */
1907                         if (high_tpt > current_tpt &&
1908                                         sr >= IWL_RATE_INCREASE_TH) {
1909                                 scale_action = 1;
1910                         } else {
1911                                 IWL_DEBUG_RATE
1912                                     ("decrease rate because of high tpt\n");
1913                                 scale_action = -1;
1914                         }
1915
1916                 /* Lower adjacent rate's throughput is measured */
1917                 } else if (low_tpt != IWL_INVALID_VALUE) {
1918                         /* Lower rate has better throughput */
1919                         if (low_tpt > current_tpt) {
1920                                 IWL_DEBUG_RATE
1921                                     ("decrease rate because of low tpt\n");
1922                                 scale_action = -1;
1923                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1924                                 scale_action = 1;
1925                         }
1926                 }
1927         }
1928
1929         /* Sanity check; asked for decrease, but success rate or throughput
1930          * has been good at old rate.  Don't change it. */
1931         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1932                     ((sr > IWL_RATE_HIGH_TH) ||
1933                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1934                 scale_action = 0;
1935
1936         switch (scale_action) {
1937         case -1:
1938                 /* Decrease starting rate, update uCode's rate table */
1939                 if (low != IWL_RATE_INVALID) {
1940                         update_lq = 1;
1941                         index = low;
1942                 }
1943                 break;
1944         case 1:
1945                 /* Increase starting rate, update uCode's rate table */
1946                 if (high != IWL_RATE_INVALID) {
1947                         update_lq = 1;
1948                         index = high;
1949                 }
1950
1951                 break;
1952         case 0:
1953                 /* No change */
1954         default:
1955                 break;
1956         }
1957
1958         IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1959                     "high %d type %d\n",
1960                      index, scale_action, low, high, tbl->lq_type);
1961
1962 lq_update:
1963         /* Replace uCode's rate table for the destination station. */
1964         if (update_lq) {
1965                 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1966                 rs_fill_link_cmd(priv, lq_sta, rate);
1967                 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1968         }
1969
1970         /* Should we stay with this modulation mode, or search for a new one? */
1971         rs_stay_in_table(lq_sta);
1972
1973         /*
1974          * Search for new modulation mode if we're:
1975          * 1)  Not changing rates right now
1976          * 2)  Not just finishing up a search
1977          * 3)  Allowing a new search
1978          */
1979         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1980                 /* Save current throughput to compare with "search" throughput*/
1981                 lq_sta->last_tpt = current_tpt;
1982
1983                 /* Select a new "search" modulation mode to try.
1984                  * If one is found, set up the new "search" table. */
1985                 if (is_legacy(tbl->lq_type))
1986                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1987                 else if (is_siso(tbl->lq_type))
1988                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1989                 else
1990                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1991
1992                 /* If new "search" mode was selected, set up in uCode table */
1993                 if (lq_sta->search_better_tbl) {
1994                         /* Access the "search" table, clear its history. */
1995                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1996                         for (i = 0; i < IWL_RATE_COUNT; i++)
1997                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1998
1999                         /* Use new "search" start rate */
2000                         index = iwl4965_hwrate_to_plcp_idx(
2001                                                         tbl->current_rate);
2002
2003                         IWL_DEBUG_RATE("Switch current  mcs: %X index: %d\n",
2004                                      tbl->current_rate, index);
2005                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2006                         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2007                 }
2008
2009                 /* If the "active" (non-search) mode was legacy,
2010                  * and we've tried switching antennas,
2011                  * but we haven't been able to try HT modes (not available),
2012                  * stay with best antenna legacy modulation for a while
2013                  * before next round of mode comparisons. */
2014                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2015                 if (is_legacy(tbl1->lq_type) &&
2016 #ifdef CONFIG_IWL4965_HT
2017                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
2018 #endif
2019                     (lq_sta->action_counter >= 1)) {
2020                         lq_sta->action_counter = 0;
2021                         IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
2022                         rs_set_stay_in_table(priv, 1, lq_sta);
2023                 }
2024
2025                 /* If we're in an HT mode, and all 3 mode switch actions
2026                  * have been tried and compared, stay in this best modulation
2027                  * mode for a while before next round of mode comparisons. */
2028                 if (lq_sta->enable_counter &&
2029                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
2030 #ifdef CONFIG_IWL4965_HT
2031                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2032                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2033                             (tid != MAX_TID_COUNT)) {
2034                                 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
2035                                 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2036                         }
2037 #endif /*CONFIG_IWL4965_HT */
2038                         lq_sta->action_counter = 0;
2039                         rs_set_stay_in_table(priv, 0, lq_sta);
2040                 }
2041
2042         /*
2043          * Else, don't search for a new modulation mode.
2044          * Put new timestamp in stay-in-modulation-mode flush timer if:
2045          * 1)  Not changing rates right now
2046          * 2)  Not just finishing up a search
2047          * 3)  flush timer is empty
2048          */
2049         } else {
2050                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2051                         lq_sta->flush_timer = jiffies;
2052         }
2053
2054 out:
2055         tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2056         i = index;
2057         sta->last_txrate_idx = i;
2058
2059         /* sta->txrate_idx is an index to A mode rates which start
2060          * at IWL_FIRST_OFDM_RATE
2061          */
2062         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2063                 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2064         else
2065                 sta->txrate_idx = i;
2066
2067         return;
2068 }
2069
2070
2071 static void rs_initialize_lq(struct iwl_priv *priv,
2072                              struct ieee80211_conf *conf,
2073                              struct sta_info *sta)
2074 {
2075         struct iwl4965_lq_sta *lq_sta;
2076         struct iwl4965_scale_tbl_info *tbl;
2077         int rate_idx;
2078         int i;
2079         u32 rate;
2080         u8 use_green = rs_use_green(priv, conf);
2081         u8 active_tbl = 0;
2082         u8 valid_tx_ant;
2083
2084         if (!sta || !sta->rate_ctrl_priv)
2085                 goto out;
2086
2087         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2088         i = sta->last_txrate_idx;
2089
2090         if ((lq_sta->lq.sta_id == 0xff) &&
2091             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2092                 goto out;
2093
2094         valid_tx_ant = priv->hw_params.valid_tx_ant;
2095
2096         if (!lq_sta->search_better_tbl)
2097                 active_tbl = lq_sta->active_tbl;
2098         else
2099                 active_tbl = 1 - lq_sta->active_tbl;
2100
2101         tbl = &(lq_sta->lq_info[active_tbl]);
2102
2103         if ((i < 0) || (i >= IWL_RATE_COUNT))
2104                 i = 0;
2105
2106         /* FIXME:RS: This is also wrong in 4965 */
2107         rate = iwl_rates[i].plcp;
2108         rate |= RATE_MCS_ANT_B_MSK;
2109         rate &= ~RATE_MCS_ANT_A_MSK;
2110
2111         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2112                 rate |= RATE_MCS_CCK_MSK;
2113
2114         tbl->ant_type = ANT_B;
2115         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2116         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2117             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2118
2119         rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2120         tbl->current_rate = rate;
2121         rs_set_expected_tpt_table(lq_sta, tbl);
2122         rs_fill_link_cmd(NULL, lq_sta, rate);
2123         iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2124  out:
2125         return;
2126 }
2127
2128 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2129                         struct ieee80211_supported_band *sband,
2130                         struct sk_buff *skb,
2131                         struct rate_selection *sel)
2132 {
2133
2134         int i;
2135         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2136         struct ieee80211_conf *conf = &local->hw.conf;
2137         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2138         struct sta_info *sta;
2139         u16 fc;
2140         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2141         struct iwl4965_lq_sta *lq_sta;
2142
2143         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2144
2145         rcu_read_lock();
2146
2147         sta = sta_info_get(local, hdr->addr1);
2148
2149         /* Send management frames and broadcast/multicast data using lowest
2150          * rate. */
2151         fc = le16_to_cpu(hdr->frame_control);
2152         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2153             !sta || !sta->rate_ctrl_priv) {
2154                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2155                 goto out;
2156         }
2157
2158         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2159         i = sta->last_txrate_idx;
2160
2161         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2162             !lq_sta->ibss_sta_added) {
2163                 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2164                 DECLARE_MAC_BUF(mac);
2165
2166                 if (sta_id == IWL_INVALID_STATION) {
2167                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2168                                        print_mac(mac, hdr->addr1));
2169                         sta_id = iwl_add_station_flags(priv, hdr->addr1,
2170                                                         0, CMD_ASYNC, NULL);
2171                 }
2172                 if ((sta_id != IWL_INVALID_STATION)) {
2173                         lq_sta->lq.sta_id = sta_id;
2174                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2175                         lq_sta->ibss_sta_added = 1;
2176                         rs_initialize_lq(priv, conf, sta);
2177                 }
2178                 if (!lq_sta->ibss_sta_added)
2179                         goto done;
2180         }
2181
2182 done:
2183         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2184                 sel->rate_idx = rate_lowest_index(local, sband, sta);
2185                 goto out;
2186         }
2187
2188         if (sband->band == IEEE80211_BAND_5GHZ)
2189                 i -= IWL_FIRST_OFDM_RATE;
2190         sel->rate_idx = i;
2191 out:
2192         rcu_read_unlock();
2193 }
2194
2195 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2196 {
2197         struct iwl4965_lq_sta *lq_sta;
2198         struct iwl_priv *priv;
2199         int i, j;
2200
2201         priv = (struct iwl_priv *)priv_rate;
2202         IWL_DEBUG_RATE("create station rate scale window\n");
2203
2204         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2205
2206         if (lq_sta == NULL)
2207                 return NULL;
2208         lq_sta->lq.sta_id = 0xff;
2209
2210
2211         for (j = 0; j < LQ_SIZE; j++)
2212                 for (i = 0; i < IWL_RATE_COUNT; i++)
2213                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2214
2215         return lq_sta;
2216 }
2217
2218 static void rs_rate_init(void *priv_rate, void *priv_sta,
2219                          struct ieee80211_local *local,
2220                          struct sta_info *sta)
2221 {
2222         int i, j;
2223         struct ieee80211_conf *conf = &local->hw.conf;
2224         struct ieee80211_supported_band *sband;
2225         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2226         struct iwl4965_lq_sta *lq_sta = priv_sta;
2227
2228         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2229
2230         lq_sta->flush_timer = 0;
2231         lq_sta->supp_rates = sta->supp_rates[sband->band];
2232         sta->txrate_idx = 3;
2233         for (j = 0; j < LQ_SIZE; j++)
2234                 for (i = 0; i < IWL_RATE_COUNT; i++)
2235                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2236
2237         IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2238         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2239          * the lowest or the highest rate.. Could consider using RSSI from
2240          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2241          * after assoc.. */
2242
2243         lq_sta->ibss_sta_added = 0;
2244         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2245                 u8 sta_id = iwl_find_station(priv, sta->addr);
2246                 DECLARE_MAC_BUF(mac);
2247
2248                 /* for IBSS the call are from tasklet */
2249                 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2250                              print_mac(mac, sta->addr));
2251
2252                 if (sta_id == IWL_INVALID_STATION) {
2253                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2254                                        print_mac(mac, sta->addr));
2255                         sta_id = iwl_add_station_flags(priv, sta->addr,
2256                                                         0, CMD_ASYNC, NULL);
2257                 }
2258                 if ((sta_id != IWL_INVALID_STATION)) {
2259                         lq_sta->lq.sta_id = sta_id;
2260                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2261                 }
2262                 /* FIXME: this is w/a remove it later */
2263                 priv->assoc_station_added = 1;
2264         }
2265
2266         /* Find highest tx rate supported by hardware and destination station */
2267         for (i = 0; i < sband->n_bitrates; i++)
2268                 if (sta->supp_rates[sband->band] & BIT(i))
2269                         sta->txrate_idx = i;
2270
2271         sta->last_txrate_idx = sta->txrate_idx;
2272         /* WTF is with this bogus comment? A doesn't have cck rates */
2273         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2274         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2275                 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2276
2277         lq_sta->is_dup = 0;
2278         lq_sta->is_green = rs_use_green(priv, conf);
2279         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2280         lq_sta->active_rate_basic = priv->active_rate_basic;
2281         lq_sta->band = priv->band;
2282 #ifdef CONFIG_IWL4965_HT
2283         /*
2284          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2285          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2286          */
2287         lq_sta->active_siso_rate =
2288                 priv->current_ht_config.supp_mcs_set[0] << 1;
2289         lq_sta->active_siso_rate |=
2290                 priv->current_ht_config.supp_mcs_set[0] & 0x1;
2291         lq_sta->active_siso_rate &= ~((u16)0x2);
2292         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2293
2294         /* Same here */
2295         lq_sta->active_mimo2_rate =
2296                 priv->current_ht_config.supp_mcs_set[1] << 1;
2297         lq_sta->active_mimo2_rate |=
2298                 priv->current_ht_config.supp_mcs_set[1] & 0x1;
2299         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2300         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2301
2302         lq_sta->active_mimo3_rate =
2303                 priv->current_ht_config.supp_mcs_set[2] << 1;
2304         lq_sta->active_mimo3_rate |=
2305                 priv->current_ht_config.supp_mcs_set[2] & 0x1;
2306         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2307         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2308
2309         IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2310                      lq_sta->active_siso_rate,
2311                      lq_sta->active_mimo2_rate,
2312                      lq_sta->active_mimo3_rate);
2313
2314         /* These values will be overriden later */
2315         lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2316         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2317
2318         /* as default allow aggregation for all tids */
2319         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2320 #endif /*CONFIG_IWL4965_HT*/
2321 #ifdef CONFIG_MAC80211_DEBUGFS
2322         lq_sta->drv = priv;
2323 #endif
2324
2325         if (priv->assoc_station_added)
2326                 priv->lq_mngr.lq_ready = 1;
2327
2328         rs_initialize_lq(priv, conf, sta);
2329 }
2330
2331 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2332                              struct iwl4965_lq_sta *lq_sta,
2333                              u32 new_rate)
2334 {
2335         struct iwl4965_scale_tbl_info tbl_type;
2336         int index = 0;
2337         int rate_idx;
2338         int repeat_rate = 0;
2339         u8 ant_toggle_cnt = 0;
2340         u8 use_ht_possible = 1;
2341         u8 valid_tx_ant = 0;
2342         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2343
2344         /* Override starting rate (index 0) if needed for debug purposes */
2345         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2346
2347         /* Interpret new_rate (rate_n_flags) */
2348         memset(&tbl_type, 0, sizeof(tbl_type));
2349         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2350                                   &tbl_type, &rate_idx);
2351
2352         /* How many times should we repeat the initial rate? */
2353         if (is_legacy(tbl_type.lq_type)) {
2354                 ant_toggle_cnt = 1;
2355                 repeat_rate = IWL_NUMBER_TRY;
2356         } else {
2357                 repeat_rate = IWL_HT_NUMBER_TRY;
2358         }
2359
2360         lq_cmd->general_params.mimo_delimiter =
2361                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2362
2363         /* Fill 1st table entry (index 0) */
2364         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2365
2366         if (num_of_ant(tbl_type.ant_type) == 1) {
2367                 lq_cmd->general_params.single_stream_ant_msk =
2368                                                 tbl_type.ant_type;
2369         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2370                 lq_cmd->general_params.dual_stream_ant_msk =
2371                                                 tbl_type.ant_type;
2372         } /* otherwise we don't modify the existing value */
2373
2374         index++;
2375         repeat_rate--;
2376
2377         if (priv)
2378                 valid_tx_ant = priv->hw_params.valid_tx_ant;
2379
2380         /* Fill rest of rate table */
2381         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2382                 /* Repeat initial/next rate.
2383                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2384                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2385                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2386                         if (is_legacy(tbl_type.lq_type)) {
2387                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2388                                         ant_toggle_cnt++;
2389                                 else if (priv &&
2390                                          rs_toggle_antenna(valid_tx_ant,
2391                                                         &new_rate, &tbl_type))
2392                                         ant_toggle_cnt = 1;
2393 }
2394
2395                         /* Override next rate if needed for debug purposes */
2396                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2397
2398                         /* Fill next table entry */
2399                         lq_cmd->rs_table[index].rate_n_flags =
2400                                         cpu_to_le32(new_rate);
2401                         repeat_rate--;
2402                         index++;
2403                 }
2404
2405                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2406                                                 &rate_idx);
2407
2408                 /* Indicate to uCode which entries might be MIMO.
2409                  * If initial rate was MIMO, this will finally end up
2410                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2411                 if (is_mimo(tbl_type.lq_type))
2412                         lq_cmd->general_params.mimo_delimiter = index;
2413
2414                 /* Get next rate */
2415                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2416                                              use_ht_possible);
2417
2418                 /* How many times should we repeat the next rate? */
2419                 if (is_legacy(tbl_type.lq_type)) {
2420                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2421                                 ant_toggle_cnt++;
2422                         else if (priv &&
2423                                  rs_toggle_antenna(valid_tx_ant,
2424                                                    &new_rate, &tbl_type))
2425                                 ant_toggle_cnt = 1;
2426
2427                         repeat_rate = IWL_NUMBER_TRY;
2428                 } else {
2429                         repeat_rate = IWL_HT_NUMBER_TRY;
2430                 }
2431
2432                 /* Don't allow HT rates after next pass.
2433                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2434                 use_ht_possible = 0;
2435
2436                 /* Override next rate if needed for debug purposes */
2437                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2438
2439                 /* Fill next table entry */
2440                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2441
2442                 index++;
2443                 repeat_rate--;
2444         }
2445
2446         lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2447         lq_cmd->agg_params.agg_dis_start_th = 3;
2448         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2449 }
2450
2451 static void *rs_alloc(struct ieee80211_local *local)
2452 {
2453         return local->hw.priv;
2454 }
2455 /* rate scale requires free function to be implemented */
2456 static void rs_free(void *priv_rate)
2457 {
2458         return;
2459 }
2460
2461 static void rs_clear(void *priv_rate)
2462 {
2463         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2464
2465         IWL_DEBUG_RATE("enter\n");
2466
2467         priv->lq_mngr.lq_ready = 0;
2468
2469         IWL_DEBUG_RATE("leave\n");
2470 }
2471
2472 static void rs_free_sta(void *priv_rate, void *priv_sta)
2473 {
2474         struct iwl4965_lq_sta *lq_sta = priv_sta;
2475         struct iwl_priv *priv;
2476
2477         priv = (struct iwl_priv *)priv_rate;
2478         IWL_DEBUG_RATE("enter\n");
2479         kfree(lq_sta);
2480         IWL_DEBUG_RATE("leave\n");
2481 }
2482
2483
2484 #ifdef CONFIG_MAC80211_DEBUGFS
2485 static int open_file_generic(struct inode *inode, struct file *file)
2486 {
2487         file->private_data = inode->i_private;
2488         return 0;
2489 }
2490 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2491                                 u32 *rate_n_flags, int index)
2492 {
2493         struct iwl_priv *priv;
2494
2495         priv = lq_sta->drv;
2496         if (lq_sta->dbg_fixed_rate) {
2497                 if (index < 12) {
2498                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2499                 } else {
2500                         if (lq_sta->band == IEEE80211_BAND_5GHZ)
2501                                 *rate_n_flags = 0x800D;
2502                         else
2503                                 *rate_n_flags = 0x820A;
2504                 }
2505                 IWL_DEBUG_RATE("Fixed rate ON\n");
2506         } else {
2507                 IWL_DEBUG_RATE("Fixed rate OFF\n");
2508         }
2509 }
2510
2511 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2512                         const char __user *user_buf, size_t count, loff_t *ppos)
2513 {
2514         struct iwl4965_lq_sta *lq_sta = file->private_data;
2515         struct iwl_priv *priv;
2516         char buf[64];
2517         int buf_size;
2518         u32 parsed_rate;
2519
2520         priv = lq_sta->drv;
2521         memset(buf, 0, sizeof(buf));
2522         buf_size = min(count, sizeof(buf) -  1);
2523         if (copy_from_user(buf, user_buf, buf_size))
2524                 return -EFAULT;
2525
2526         if (sscanf(buf, "%x", &parsed_rate) == 1)
2527                 lq_sta->dbg_fixed_rate = parsed_rate;
2528         else
2529                 lq_sta->dbg_fixed_rate = 0;
2530
2531         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
2532         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2533         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2534         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
2535
2536         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2537                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2538
2539         if (lq_sta->dbg_fixed_rate) {
2540                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2541                 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2542         }
2543
2544         return count;
2545 }
2546
2547 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2548                         char __user *user_buf, size_t count, loff_t *ppos)
2549 {
2550         char buff[1024];
2551         int desc = 0;
2552         int i = 0;
2553
2554         struct iwl4965_lq_sta *lq_sta = file->private_data;
2555
2556         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2557         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2558                         lq_sta->total_failed, lq_sta->total_success,
2559                         lq_sta->active_legacy_rate);
2560         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2561                         lq_sta->dbg_fixed_rate);
2562         desc += sprintf(buff+desc, "general:"
2563                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2564                 lq_sta->lq.general_params.flags,
2565                 lq_sta->lq.general_params.mimo_delimiter,
2566                 lq_sta->lq.general_params.single_stream_ant_msk,
2567                 lq_sta->lq.general_params.dual_stream_ant_msk);
2568
2569         desc += sprintf(buff+desc, "agg:"
2570                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2571                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2572                         lq_sta->lq.agg_params.agg_dis_start_th,
2573                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2574
2575         desc += sprintf(buff+desc,
2576                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2577                         lq_sta->lq.general_params.start_rate_index[0],
2578                         lq_sta->lq.general_params.start_rate_index[1],
2579                         lq_sta->lq.general_params.start_rate_index[2],
2580                         lq_sta->lq.general_params.start_rate_index[3]);
2581
2582
2583         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2584                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2585                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2586
2587         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2588 }
2589
2590 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2591         .write = rs_sta_dbgfs_scale_table_write,
2592         .read = rs_sta_dbgfs_scale_table_read,
2593         .open = open_file_generic,
2594 };
2595 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2596                         char __user *user_buf, size_t count, loff_t *ppos)
2597 {
2598         char buff[1024];
2599         int desc = 0;
2600         int i, j;
2601
2602         struct iwl4965_lq_sta *lq_sta = file->private_data;
2603         for (i = 0; i < LQ_SIZE; i++) {
2604                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2605                                 "rate=0x%X\n",
2606                                 lq_sta->active_tbl == i?"*":"x",
2607                                 lq_sta->lq_info[i].lq_type,
2608                                 lq_sta->lq_info[i].is_SGI,
2609                                 lq_sta->lq_info[i].is_fat,
2610                                 lq_sta->lq_info[i].is_dup,
2611                                 lq_sta->lq_info[i].current_rate);
2612                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2613                         desc += sprintf(buff+desc,
2614                                 "counter=%d success=%d %%=%d\n",
2615                                 lq_sta->lq_info[i].win[j].counter,
2616                                 lq_sta->lq_info[i].win[j].success_counter,
2617                                 lq_sta->lq_info[i].win[j].success_ratio);
2618                 }
2619         }
2620         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2621 }
2622
2623 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2624         .read = rs_sta_dbgfs_stats_table_read,
2625         .open = open_file_generic,
2626 };
2627
2628 static void rs_add_debugfs(void *priv, void *priv_sta,
2629                                         struct dentry *dir)
2630 {
2631         struct iwl4965_lq_sta *lq_sta = priv_sta;
2632         lq_sta->rs_sta_dbgfs_scale_table_file =
2633                 debugfs_create_file("rate_scale_table", 0600, dir,
2634                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2635         lq_sta->rs_sta_dbgfs_stats_table_file =
2636                 debugfs_create_file("rate_stats_table", 0600, dir,
2637                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2638 #ifdef CONFIG_IWL4965_HT
2639         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2640                 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2641                 &lq_sta->tx_agg_tid_en);
2642 #endif
2643
2644 }
2645
2646 static void rs_remove_debugfs(void *priv, void *priv_sta)
2647 {
2648         struct iwl4965_lq_sta *lq_sta = priv_sta;
2649         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2650         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2651 #ifdef CONFIG_IWL4965_HT
2652         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2653 #endif
2654 }
2655 #endif
2656
2657 static struct rate_control_ops rs_ops = {
2658         .module = NULL,
2659         .name = RS_NAME,
2660         .tx_status = rs_tx_status,
2661         .get_rate = rs_get_rate,
2662         .rate_init = rs_rate_init,
2663         .clear = rs_clear,
2664         .alloc = rs_alloc,
2665         .free = rs_free,
2666         .alloc_sta = rs_alloc_sta,
2667         .free_sta = rs_free_sta,
2668 #ifdef CONFIG_MAC80211_DEBUGFS
2669         .add_sta_debugfs = rs_add_debugfs,
2670         .remove_sta_debugfs = rs_remove_debugfs,
2671 #endif
2672 };
2673
2674 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2675 {
2676         struct ieee80211_local *local = hw_to_local(hw);
2677         struct iwl_priv *priv = hw->priv;
2678         struct iwl4965_lq_sta *lq_sta;
2679         struct sta_info *sta;
2680         int cnt = 0, i;
2681         u32 samples = 0, success = 0, good = 0;
2682         unsigned long now = jiffies;
2683         u32 max_time = 0;
2684         u8 lq_type, antenna;
2685
2686         rcu_read_lock();
2687
2688         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2689         if (!sta || !sta->rate_ctrl_priv) {
2690                 if (sta)
2691                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2692                 else
2693                         IWL_DEBUG_RATE("leave - no station!\n");
2694                 rcu_read_unlock();
2695                 return sprintf(buf, "station %d not found\n", sta_id);
2696         }
2697
2698         lq_sta = (void *)sta->rate_ctrl_priv;
2699
2700         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2701         antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2702
2703         if (is_legacy(lq_type))
2704                 i = IWL_RATE_54M_INDEX;
2705         else
2706                 i = IWL_RATE_60M_INDEX;
2707         while (1) {
2708                 u64 mask;
2709                 int j;
2710                 int active = lq_sta->active_tbl;
2711
2712                 cnt +=
2713                     sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2714
2715                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2716                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2717                         buf[cnt++] =
2718                                 (lq_sta->lq_info[active].win[i].data & mask)
2719                                 ? '1' : '0';
2720
2721                 samples += lq_sta->lq_info[active].win[i].counter;
2722                 good += lq_sta->lq_info[active].win[i].success_counter;
2723                 success += lq_sta->lq_info[active].win[i].success_counter *
2724                            iwl_rates[i].ieee;
2725
2726                 if (lq_sta->lq_info[active].win[i].stamp) {
2727                         int delta =
2728                                    jiffies_to_msecs(now -
2729                                    lq_sta->lq_info[active].win[i].stamp);
2730
2731                         if (delta > max_time)
2732                                 max_time = delta;
2733
2734                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2735                 } else
2736                         buf[cnt++] = '\n';
2737
2738                 j = iwl4965_get_prev_ieee_rate(i);
2739                 if (j == i)
2740                         break;
2741                 i = j;
2742         }
2743
2744         /*
2745          * Display the average rate of all samples taken.
2746          * NOTE: We multiply # of samples by 2 since the IEEE measurement
2747          * added from iwl_rates is actually 2X the rate.
2748          */
2749         if (samples)
2750                 cnt += sprintf(&buf[cnt],
2751                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2752                          "%3d%% success (%d good packets over %d tries)\n",
2753                          success / (2 * samples), (success * 5 / samples) % 10,
2754                          max_time, good * 100 / samples, good, samples);
2755         else
2756                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2757
2758         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2759                          "active_search %d rate index %d\n", lq_type, antenna,
2760                          lq_sta->search_better_tbl, sta->last_txrate_idx);
2761
2762         rcu_read_unlock();
2763         return cnt;
2764 }
2765
2766 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2767 {
2768         struct iwl_priv *priv = hw->priv;
2769
2770         priv->lq_mngr.lq_ready = 1;
2771 }
2772
2773 int iwl4965_rate_control_register(void)
2774 {
2775         return ieee80211_rate_control_register(&rs_ops);
2776 }
2777
2778 void iwl4965_rate_control_unregister(void)
2779 {
2780         ieee80211_rate_control_unregister(&rs_ops);
2781 }
2782