git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-4965-rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2007 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 #include <net/ieee80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "../net/mac80211/ieee80211_rate.h"
  40
  41 #include "iwl-4965.h"
  42 #include "iwl-helpers.h"
  43
  44 #define RS_NAME "iwl-4965-rs"
  45
  46 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max time to accum history 2 seconds */
  55 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)
  56
  57 static u8 rs_ht_to_legacy[] = {
  58         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  59         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  60         IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  62         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  63         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  64         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  65 };
  66
  67 struct iwl4965_rate {
  68         u32 rate_n_flags;
  69 } __attribute__ ((packed));
  70
  71 /**
  72  * struct iwl4965_rate_scale_data -- tx success history for one rate
  73  */
  74 struct iwl4965_rate_scale_data {
  75         u64 data;               /* bitmap of successful frames */
  76         s32 success_counter;    /* number of frames successful */
  77         s32 success_ratio;      /* per-cent * 128  */
  78         s32 counter;            /* number of frames attempted */
  79         s32 average_tpt;        /* success ratio * expected throughput */
  80         unsigned long stamp;
  81 };
  82
  83 /**
  84  * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
  85  *
  86  * There are two of these in struct iwl_rate_scale_priv,
  87  * one for "active", and one for "search".
  88  */
  89 struct iwl4965_scale_tbl_info {
  90         enum iwl4965_table_type lq_type;
  91         enum iwl4965_antenna_type antenna_type;
  92         u8 is_SGI;      /* 1 = short guard interval */
  93         u8 is_fat;      /* 1 = 40 MHz channel width */
  94         u8 is_dup;      /* 1 = duplicated data streams */
  95         u8 action;      /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
  96         s32 *expected_tpt;      /* throughput metrics; expected_tpt_G, etc. */
  97         struct iwl4965_rate current_rate;  /* rate_n_flags, uCode API format */
  98         struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
  99 };
 100
 101 /**
 102  * struct iwl_rate_scale_priv -- driver's rate scaling private structure
 103  *
 104  * Pointer to this gets passed back and forth between driver and mac80211.
 105  */
 106 struct iwl4965_rate_scale_priv {
 107         u8 active_tbl;          /* index of active table, range 0-1 */
 108         u8 enable_counter;      /* indicates HT mode */
 109         u8 stay_in_tbl;         /* 1: disallow, 0: allow search for new mode */
 110         u8 search_better_tbl;   /* 1: currently trying alternate mode */
 111         s32 last_tpt;
 112
 113         /* The following determine when to search for a new mode */
 114         u32 table_count_limit;
 115         u32 max_failure_limit;  /* # failed frames before new search */
 116         u32 max_success_limit;  /* # successful frames before new search */
 117         u32 table_count;
 118         u32 total_failed;       /* total failed frames, any/all rates */
 119         u32 total_success;      /* total successful frames, any/all rates */
 120         u32 flush_timer;        /* time staying in mode before new search */
 121
 122         u8 action_counter;      /* # mode-switch actions tried */
 123         u8 antenna;
 124         u8 valid_antenna;
 125         u8 is_green;
 126         u8 is_dup;
 127         u8 phymode;
 128         u8 ibss_sta_added;
 129
 130         /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
 131         u32 supp_rates;
 132         u16 active_rate;
 133         u16 active_siso_rate;
 134         u16 active_mimo_rate;
 135         u16 active_rate_basic;
 136
 137         struct iwl4965_link_quality_cmd lq;
 138         struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
 139 #ifdef CONFIG_MAC80211_DEBUGFS
 140         struct dentry *rs_sta_dbgfs_scale_table_file;
 141         struct dentry *rs_sta_dbgfs_stats_table_file;
 142         struct iwl4965_rate dbg_fixed;
 143         struct iwl4965_priv *drv;
 144 #endif
 145 };
 146
 147 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
 148                                    struct net_device *dev,
 149                                    struct ieee80211_hdr *hdr,
 150                                    struct sta_info *sta);
 151 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
 152                              struct iwl4965_rate *tx_mcs,
 153                              struct iwl4965_link_quality_cmd *tbl);
 154
 155
 156 #ifdef CONFIG_MAC80211_DEBUGFS
 157 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
 158                                 struct iwl4965_rate *mcs, int index);
 159 #else
 160 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
 161                                 struct iwl4965_rate *mcs, int index)
 162 {}
 163 #endif
 164
 165 /*
 166  * Expected throughput metrics for following rates:
 167  * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 168  * "G" is the only table that supports CCK (the first 4 rates).
 169  */
 170 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 171         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 172 };
 173
 174 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 175         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 176 };
 177
 178 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 179         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 180 };
 181
 182 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 183         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 184 };
 185
 186 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 187         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 188 };
 189
 190 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 191         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 195         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 196 };
 197
 198 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 199         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 200 };
 201
 202 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 203         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 204 };
 205
 206 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 207         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 208 };
 209
 210 static int iwl4965_lq_sync_callback(struct iwl4965_priv *priv,
 211                                 struct iwl4965_cmd *cmd, struct sk_buff *skb)
 212 {
 213         /*We didn't cache the SKB; let the caller free it */
 214         return 1;
 215 }
 216
 217 static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
 218 {
 219         return (u8)(rate_n_flags & 0xFF);
 220 }
 221
 222 static int rs_send_lq_cmd(struct iwl4965_priv *priv,
 223                           struct iwl4965_link_quality_cmd *lq, u8 flags)
 224 {
 225 #ifdef CONFIG_IWL4965_DEBUG
 226         int i;
 227 #endif
 228         struct iwl4965_host_cmd cmd = {
 229                 .id = REPLY_TX_LINK_QUALITY_CMD,
 230                 .len = sizeof(struct iwl4965_link_quality_cmd),
 231                 .meta.flags = flags,
 232                 .data = lq,
 233         };
 234
 235         if ((lq->sta_id == 0xFF) &&
 236             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
 237                 return -EINVAL;
 238
 239         if (lq->sta_id == 0xFF)
 240                 lq->sta_id = IWL_AP_ID;
 241
 242         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
 243         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
 244                        lq->general_params.single_stream_ant_msk,
 245                        lq->general_params.dual_stream_ant_msk);
 246 #ifdef CONFIG_IWL4965_DEBUG
 247         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 248                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
 249                                 i, lq->rs_table[i].rate_n_flags);
 250 #endif
 251
 252         if (flags & CMD_ASYNC)
 253                 cmd.meta.u.callback = iwl4965_lq_sync_callback;
 254
 255         if (iwl4965_is_associated(priv) && priv->assoc_station_added &&
 256             priv->lq_mngr.lq_ready)
 257                 return  iwl4965_send_cmd(priv, &cmd);
 258
 259         return 0;
 260 }
 261
 262 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
 263 {
 264         window->data = 0;
 265         window->success_counter = 0;
 266         window->success_ratio = IWL_INVALID_VALUE;
 267         window->counter = 0;
 268         window->average_tpt = IWL_INVALID_VALUE;
 269         window->stamp = 0;
 270 }
 271
 272 /**
 273  * rs_collect_tx_data - Update the success/failure sliding window
 274  *
 275  * We keep a sliding window of the last 62 packets transmitted
 276  * at this rate.  window->data contains the bitmask of successful
 277  * packets.
 278  */
 279 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
 280                               int scale_index, s32 tpt, u32 status)
 281 {
 282         struct iwl4965_rate_scale_data *window = NULL;
 283         u64 mask;
 284         u8 win_size = IWL_RATE_MAX_WINDOW;
 285         s32 fail_count;
 286
 287         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 288                 return -EINVAL;
 289
 290         /* Select data for current tx bit rate */
 291         window = &(windows[scale_index]);
 292
 293         /*
 294          * Keep track of only the latest 62 tx frame attempts in this rate's
 295          * history window; anything older isn't really relevant any more.
 296          * If we have filled up the sliding window, drop the oldest attempt;
 297          * if the oldest attempt (highest bit in bitmap) shows "success",
 298          * subtract "1" from the success counter (this is the main reason
 299          * we keep these bitmaps!).
 300          */
 301         if (window->counter >= win_size) {
 302                 window->counter = win_size - 1;
 303                 mask = 1;
 304                 mask = (mask << (win_size - 1));
 305                 if ((window->data & mask)) {
 306                         window->data &= ~mask;
 307                         window->success_counter = window->success_counter - 1;
 308                 }
 309         }
 310
 311         /* Increment frames-attempted counter */
 312         window->counter = window->counter + 1;
 313
 314         /* Shift bitmap by one frame (throw away oldest history),
 315          * OR in "1", and increment "success" if this frame was successful. */
 316         mask = window->data;
 317         window->data = (mask << 1);
 318         if (status != 0) {
 319                 window->success_counter = window->success_counter + 1;
 320                 window->data |= 0x1;
 321         }
 322
 323         /* Calculate current success ratio, avoid divide-by-0! */
 324         if (window->counter > 0)
 325                 window->success_ratio = 128 * (100 * window->success_counter)
 326                                         / window->counter;
 327         else
 328                 window->success_ratio = IWL_INVALID_VALUE;
 329
 330         fail_count = window->counter - window->success_counter;
 331
 332         /* Calculate average throughput, if we have enough history. */
 333         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 334             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 335                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 336         else
 337                 window->average_tpt = IWL_INVALID_VALUE;
 338
 339         /* Tag this window as having been updated */
 340         window->stamp = jiffies;
 341
 342         return 0;
 343 }
 344
 345 /*
 346  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 347  */
 348 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
 349                            struct iwl4965_scale_tbl_info *tbl,
 350                            int index, u8 use_green)
 351 {
 352         if (is_legacy(tbl->lq_type)) {
 353                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
 354                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 355                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 356
 357         } else if (is_siso(tbl->lq_type)) {
 358                 if (index > IWL_LAST_OFDM_RATE)
 359                         index = IWL_LAST_OFDM_RATE;
 360                  mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
 361                                           RATE_MCS_HT_MSK;
 362         } else {
 363                 if (index > IWL_LAST_OFDM_RATE)
 364                         index = IWL_LAST_OFDM_RATE;
 365                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
 366                                          RATE_MCS_HT_MSK;
 367         }
 368
 369         switch (tbl->antenna_type) {
 370         case ANT_BOTH:
 371                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
 372                 break;
 373         case ANT_MAIN:
 374                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 375                 break;
 376         case ANT_AUX:
 377                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 378                 break;
 379         case ANT_NONE:
 380                 break;
 381         }
 382
 383         if (is_legacy(tbl->lq_type))
 384                 return;
 385
 386         if (tbl->is_fat) {
 387                 if (tbl->is_dup)
 388                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 389                 else
 390                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 391         }
 392         if (tbl->is_SGI)
 393                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 394
 395         if (use_green) {
 396                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 397                 if (is_siso(tbl->lq_type))
 398                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 399         }
 400 }
 401
 402 /*
 403  * Interpret uCode API's rate_n_flags format,
 404  * fill "search" or "active" tx mode table.
 405  */
 406 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
 407                                     int phymode, struct iwl4965_scale_tbl_info *tbl,
 408                                     int *rate_idx)
 409 {
 410         int index;
 411         u32 ant_msk;
 412
 413         index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
 414
 415         if (index  == IWL_RATE_INVALID) {
 416                 *rate_idx = -1;
 417                 return -EINVAL;
 418         }
 419         tbl->is_SGI = 0;        /* default legacy setup */
 420         tbl->is_fat = 0;
 421         tbl->is_dup = 0;
 422         tbl->antenna_type = ANT_BOTH;   /* default MIMO setup */
 423
 424         /* legacy rate format */
 425         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 426                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 427
 428                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 429                         tbl->lq_type = LQ_NONE;
 430                 else {
 431
 432                         if (phymode == MODE_IEEE80211A)
 433                                 tbl->lq_type = LQ_A;
 434                         else
 435                                 tbl->lq_type = LQ_G;
 436
 437                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 438                                 tbl->antenna_type = ANT_MAIN;
 439                         else
 440                                 tbl->antenna_type = ANT_AUX;
 441                 }
 442                 *rate_idx = index;
 443
 444         /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
 445         } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
 446                                         <= IWL_RATE_SISO_60M_PLCP) {
 447                 tbl->lq_type = LQ_SISO;
 448
 449                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 450                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 451                         tbl->lq_type = LQ_NONE;
 452                 else {
 453                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 454                                 tbl->antenna_type = ANT_MAIN;
 455                         else
 456                                 tbl->antenna_type = ANT_AUX;
 457                 }
 458                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 459                         tbl->is_SGI = 1;
 460
 461                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 462                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 463                         tbl->is_fat = 1;
 464
 465                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 466                         tbl->is_dup = 1;
 467
 468                 *rate_idx = index;
 469
 470         /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
 471         } else {
 472                 tbl->lq_type = LQ_MIMO;
 473                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 474                         tbl->is_SGI = 1;
 475
 476                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 477                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 478                         tbl->is_fat = 1;
 479
 480                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 481                         tbl->is_dup = 1;
 482                 *rate_idx = index;
 483         }
 484         return 0;
 485 }
 486
 487 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
 488                                      struct iwl4965_scale_tbl_info *tbl)
 489 {
 490         if (tbl->antenna_type == ANT_AUX) {
 491                 tbl->antenna_type = ANT_MAIN;
 492                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
 493                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 494         } else {
 495                 tbl->antenna_type = ANT_AUX;
 496                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
 497                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 498         }
 499 }
 500
 501 static inline u8 rs_use_green(struct iwl4965_priv *priv,
 502                               struct ieee80211_conf *conf)
 503 {
 504 #ifdef CONFIG_IWL4965_HT
 505         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 506                 priv->current_ht_config.is_green_field &&
 507                 !priv->current_ht_config.non_GF_STA_present);
 508 #endif  /* CONFIG_IWL4965_HT */
 509         return 0;
 510 }
 511
 512 /**
 513  * rs_get_supported_rates - get the available rates
 514  *
 515  * if management frame or broadcast frame only return
 516  * basic available rates.
 517  *
 518  */
 519 static void rs_get_supported_rates(struct iwl4965_rate_scale_priv *lq_data,
 520                                    struct ieee80211_hdr *hdr,
 521                                    enum iwl4965_table_type rate_type,
 522                                    u16 *data_rate)
 523 {
 524         if (is_legacy(rate_type))
 525                 *data_rate = lq_data->active_rate;
 526         else {
 527                 if (is_siso(rate_type))
 528                         *data_rate = lq_data->active_siso_rate;
 529                 else
 530                         *data_rate = lq_data->active_mimo_rate;
 531         }
 532
 533         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 534             lq_data->active_rate_basic)
 535                 *data_rate = lq_data->active_rate_basic;
 536 }
 537
 538 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 539 {
 540         u8 high = IWL_RATE_INVALID;
 541         u8 low = IWL_RATE_INVALID;
 542
 543         /* 802.11A or ht walks to the next literal adjacent rate in
 544          * the rate table */
 545         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 546                 int i;
 547                 u32 mask;
 548
 549                 /* Find the previous rate that is in the rate mask */
 550                 i = index - 1;
 551                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 552                         if (rate_mask & mask) {
 553                                 low = i;
 554                                 break;
 555                         }
 556                 }
 557
 558                 /* Find the next rate that is in the rate mask */
 559                 i = index + 1;
 560                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 561                         if (rate_mask & mask) {
 562                                 high = i;
 563                                 break;
 564                         }
 565                 }
 566
 567                 return (high << 8) | low;
 568         }
 569
 570         low = index;
 571         while (low != IWL_RATE_INVALID) {
 572                 low = iwl4965_rates[low].prev_rs;
 573                 if (low == IWL_RATE_INVALID)
 574                         break;
 575                 if (rate_mask & (1 << low))
 576                         break;
 577                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 578         }
 579
 580         high = index;
 581         while (high != IWL_RATE_INVALID) {
 582                 high = iwl4965_rates[high].next_rs;
 583                 if (high == IWL_RATE_INVALID)
 584                         break;
 585                 if (rate_mask & (1 << high))
 586                         break;
 587                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 588         }
 589
 590         return (high << 8) | low;
 591 }
 592
 593 static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
 594                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 595                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
 596 {
 597         s32 low;
 598         u16 rate_mask;
 599         u16 high_low;
 600         u8 switch_to_legacy = 0;
 601         u8 is_green = lq_data->is_green;
 602
 603         /* check if we need to switch from HT to legacy rates.
 604          * assumption is that mandatory rates (1Mbps or 6Mbps)
 605          * are always supported (spec demand) */
 606         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 607                 switch_to_legacy = 1;
 608                 scale_index = rs_ht_to_legacy[scale_index];
 609                 if (lq_data->phymode == MODE_IEEE80211A)
 610                         tbl->lq_type = LQ_A;
 611                 else
 612                         tbl->lq_type = LQ_G;
 613
 614                 if ((tbl->antenna_type == ANT_BOTH) ||
 615                     (tbl->antenna_type == ANT_NONE))
 616                         tbl->antenna_type = ANT_MAIN;
 617
 618                 tbl->is_fat = 0;
 619                 tbl->is_SGI = 0;
 620         }
 621
 622         rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
 623
 624         /* Mask with station rate restriction */
 625         if (is_legacy(tbl->lq_type)) {
 626                 /* supp_rates has no CCK bits in A mode */
 627                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
 628                         rate_mask  = (u16)(rate_mask &
 629                            (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
 630                 else
 631                         rate_mask = (u16)(rate_mask & lq_data->supp_rates);
 632         }
 633
 634         /* If we switched from HT to legacy, check current rate */
 635         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 636                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 637                 return;
 638         }
 639
 640         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 641         low = high_low & 0xff;
 642
 643         if (low != IWL_RATE_INVALID)
 644                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 645         else
 646                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 647 }
 648
 649 /*
 650  * mac80211 sends us Tx status
 651  */
 652 static void rs_tx_status(void *priv_rate,
 653                          struct net_device *dev,
 654                          struct sk_buff *skb,
 655                          struct ieee80211_tx_status *tx_resp)
 656 {
 657         int status;
 658         u8 retries;
 659         int rs_index, index = 0;
 660         struct iwl4965_rate_scale_priv *lq;
 661         struct iwl4965_link_quality_cmd *table;
 662         struct sta_info *sta;
 663         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 664         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
 665         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 666         struct iwl4965_rate_scale_data *window = NULL;
 667         struct iwl4965_rate_scale_data *search_win = NULL;
 668         struct iwl4965_rate tx_mcs;
 669         struct iwl4965_scale_tbl_info tbl_type;
 670         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 671         u8 active_index = 0;
 672         u16 fc = le16_to_cpu(hdr->frame_control);
 673         s32 tpt = 0;
 674
 675         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 676
 677         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 678                 return;
 679
 680         retries = tx_resp->retry_count;
 681
 682         if (retries > 15)
 683                 retries = 15;
 684
 685
 686         sta = sta_info_get(local, hdr->addr1);
 687
 688         if (!sta || !sta->rate_ctrl_priv) {
 689                 if (sta)
 690                         sta_info_put(sta);
 691                 return;
 692         }
 693
 694         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
 695
 696         if (!priv->lq_mngr.lq_ready)
 697                 return;
 698
 699         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
 700                 return;
 701
 702         table = &lq->lq;
 703         active_index = lq->active_tbl;
 704
 705         /* Get mac80211 antenna info */
 706         lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
 707         if (!lq->antenna)
 708                 lq->antenna = lq->valid_antenna;
 709
 710         /* Ignore mac80211 antenna info for now */
 711         lq->antenna = lq->valid_antenna;
 712
 713         curr_tbl = &(lq->lq_info[active_index]);
 714         search_tbl = &(lq->lq_info[(1 - active_index)]);
 715         window = (struct iwl4965_rate_scale_data *)
 716             &(curr_tbl->win[0]);
 717         search_win = (struct iwl4965_rate_scale_data *)
 718             &(search_tbl->win[0]);
 719
 720         tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 721
 722         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 723                                   &tbl_type, &rs_index);
 724         if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
 725                 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
 726                              rs_index, tx_mcs.rate_n_flags);
 727                 sta_info_put(sta);
 728                 return;
 729         }
 730
 731         /*
 732          * Ignore this Tx frame response if its initial rate doesn't match
 733          * that of latest Link Quality command.  There may be stragglers
 734          * from a previous Link Quality command, but we're no longer interested
 735          * in those; they're either from the "active" mode while we're trying
 736          * to check "search" mode, or a prior "search" mode after we've moved
 737          * to a new "search" mode (which might become the new "active" mode).
 738          */
 739         if (retries &&
 740             (tx_mcs.rate_n_flags !=
 741                                 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
 742                 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
 743                                 tx_mcs.rate_n_flags,
 744                                 le32_to_cpu(table->rs_table[0].rate_n_flags));
 745                 sta_info_put(sta);
 746                 return;
 747         }
 748
 749         /* Update frame history window with "failure" for each Tx retry. */
 750         while (retries) {
 751                 /* Look up the rate and other info used for each tx attempt.
 752                  * Each tx attempt steps one entry deeper in the rate table. */
 753                 tx_mcs.rate_n_flags =
 754                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 755                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 756                                           &tbl_type, &rs_index);
 757
 758                 /* If type matches "search" table,
 759                  * add failure to "search" history */
 760                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 761                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
 762                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 763                         if (search_tbl->expected_tpt)
 764                                 tpt = search_tbl->expected_tpt[rs_index];
 765                         else
 766                                 tpt = 0;
 767                         rs_collect_tx_data(search_win, rs_index, tpt, 0);
 768
 769                 /* Else if type matches "current/active" table,
 770                  * add failure to "current/active" history */
 771                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 772                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 773                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 774                         if (curr_tbl->expected_tpt)
 775                                 tpt = curr_tbl->expected_tpt[rs_index];
 776                         else
 777                                 tpt = 0;
 778                         rs_collect_tx_data(window, rs_index, tpt, 0);
 779                 }
 780
 781                 /* If not searching for a new mode, increment failed counter
 782                  * ... this helps determine when to start searching again */
 783                 if (lq->stay_in_tbl)
 784                         lq->total_failed++;
 785                 --retries;
 786                 index++;
 787
 788         }
 789
 790         /*
 791          * Find (by rate) the history window to update with final Tx attempt;
 792          * if Tx was successful first try, use original rate,
 793          * else look up the rate that was, finally, successful.
 794          */
 795         if (!tx_resp->retry_count)
 796                 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 797         else
 798                 tx_mcs.rate_n_flags =
 799                         le32_to_cpu(table->rs_table[index].rate_n_flags);
 800
 801         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 802                                   &tbl_type, &rs_index);
 803
 804         /* Update frame history window with "success" if Tx got ACKed ... */
 805         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 806                 status = 1;
 807         else
 808                 status = 0;
 809
 810         /* If type matches "search" table,
 811          * add final tx status to "search" history */
 812         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 813             (tbl_type.antenna_type == search_tbl->antenna_type) &&
 814             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 815                 if (search_tbl->expected_tpt)
 816                         tpt = search_tbl->expected_tpt[rs_index];
 817                 else
 818                         tpt = 0;
 819                 rs_collect_tx_data(search_win,
 820                                     rs_index, tpt, status);
 821
 822         /* Else if type matches "current/active" table,
 823          * add final tx status to "current/active" history */
 824         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 825                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 826                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 827                 if (curr_tbl->expected_tpt)
 828                         tpt = curr_tbl->expected_tpt[rs_index];
 829                 else
 830                         tpt = 0;
 831                 rs_collect_tx_data(window, rs_index, tpt, status);
 832         }
 833
 834         /* If not searching for new mode, increment success/failed counter
 835          * ... these help determine when to start searching again */
 836         if (lq->stay_in_tbl) {
 837                 if (status)
 838                         lq->total_success++;
 839                 else
 840                         lq->total_failed++;
 841         }
 842
 843         /* See if there's a better rate or modulation mode to try. */
 844         rs_rate_scale_perform(priv, dev, hdr, sta);
 845         sta_info_put(sta);
 846         return;
 847 }
 848
 849 static u8 rs_is_ant_connected(u8 valid_antenna,
 850                               enum iwl4965_antenna_type antenna_type)
 851 {
 852         if (antenna_type == ANT_AUX)
 853                 return ((valid_antenna & 0x2) ? 1:0);
 854         else if (antenna_type == ANT_MAIN)
 855                 return ((valid_antenna & 0x1) ? 1:0);
 856         else if (antenna_type == ANT_BOTH)
 857                 return ((valid_antenna & 0x3) == 0x3);
 858
 859         return 1;
 860 }
 861
 862 static u8 rs_is_other_ant_connected(u8 valid_antenna,
 863                                     enum iwl4965_antenna_type antenna_type)
 864 {
 865         if (antenna_type == ANT_AUX)
 866                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
 867         else
 868                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
 869
 870         return 0;
 871 }
 872
 873 /*
 874  * Begin a period of staying with a selected modulation mode.
 875  * Set "stay_in_tbl" flag to prevent any mode switches.
 876  * Set frame tx success limits according to legacy vs. high-throughput,
 877  * and reset overall (spanning all rates) tx success history statistics.
 878  * These control how long we stay using same modulation mode before
 879  * searching for a new mode.
 880  */
 881 static void rs_set_stay_in_table(u8 is_legacy,
 882                                  struct iwl4965_rate_scale_priv *lq_data)
 883 {
 884         IWL_DEBUG_HT("we are staying in the same table\n");
 885         lq_data->stay_in_tbl = 1;       /* only place this gets set */
 886         if (is_legacy) {
 887                 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 888                 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 889                 lq_data->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 890         } else {
 891                 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 892                 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 893                 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 894         }
 895         lq_data->table_count = 0;
 896         lq_data->total_failed = 0;
 897         lq_data->total_success = 0;
 898 }
 899
 900 /*
 901  * Find correct throughput table for given mode of modulation
 902  */
 903 static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
 904                                       struct iwl4965_scale_tbl_info *tbl)
 905 {
 906         if (is_legacy(tbl->lq_type)) {
 907                 if (!is_a_band(tbl->lq_type))
 908                         tbl->expected_tpt = expected_tpt_G;
 909                 else
 910                         tbl->expected_tpt = expected_tpt_A;
 911         } else if (is_siso(tbl->lq_type)) {
 912                 if (tbl->is_fat && !lq_data->is_dup)
 913                         if (tbl->is_SGI)
 914                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 915                         else
 916                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 917                 else if (tbl->is_SGI)
 918                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
 919                 else
 920                         tbl->expected_tpt = expected_tpt_siso20MHz;
 921
 922         } else if (is_mimo(tbl->lq_type)) {
 923                 if (tbl->is_fat && !lq_data->is_dup)
 924                         if (tbl->is_SGI)
 925                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
 926                         else
 927                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
 928                 else if (tbl->is_SGI)
 929                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
 930                 else
 931                         tbl->expected_tpt = expected_tpt_mimo20MHz;
 932         } else
 933                 tbl->expected_tpt = expected_tpt_G;
 934 }
 935
 936 #ifdef CONFIG_IWL4965_HT
 937 /*
 938  * Find starting rate for new "search" high-throughput mode of modulation.
 939  * Goal is to find lowest expected rate (under perfect conditions) that is
 940  * above the current measured throughput of "active" mode, to give new mode
 941  * a fair chance to prove itself without too many challenges.
 942  *
 943  * This gets called when transitioning to more aggressive modulation
 944  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
 945  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
 946  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
 947  * bit rate will typically need to increase, but not if performance was bad.
 948  */
 949 static s32 rs_get_best_rate(struct iwl4965_priv *priv,
 950                             struct iwl4965_rate_scale_priv *lq_data,
 951                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
 952                             u16 rate_mask, s8 index, s8 rate)
 953 {
 954         /* "active" values */
 955         struct iwl4965_scale_tbl_info *active_tbl =
 956             &(lq_data->lq_info[lq_data->active_tbl]);
 957         s32 active_sr = active_tbl->win[index].success_ratio;
 958         s32 active_tpt = active_tbl->expected_tpt[index];
 959
 960         /* expected "search" throughput */
 961         s32 *tpt_tbl = tbl->expected_tpt;
 962
 963         s32 new_rate, high, low, start_hi;
 964         u16 high_low;
 965
 966         new_rate = high = low = start_hi = IWL_RATE_INVALID;
 967
 968         for (; ;) {
 969                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
 970
 971                 low = high_low & 0xff;
 972                 high = (high_low >> 8) & 0xff;
 973
 974                 /*
 975                  * Lower the "search" bit rate, to give new "search" mode
 976                  * approximately the same throughput as "active" if:
 977                  *
 978                  * 1) "Active" mode has been working modestly well (but not
 979                  *    great), and expected "search" throughput (under perfect
 980                  *    conditions) at candidate rate is above the actual
 981                  *    measured "active" throughput (but less than expected
 982                  *    "active" throughput under perfect conditions).
 983                  * OR
 984                  * 2) "Active" mode has been working perfectly or very well
 985                  *    and expected "search" throughput (under perfect
 986                  *    conditions) at candidate rate is above expected
 987                  *    "active" throughput (under perfect conditions).
 988                  */
 989                 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
 990                      ((active_sr > IWL_RATE_DECREASE_TH) &&
 991                       (active_sr <= IWL_RATE_HIGH_TH) &&
 992                       (tpt_tbl[rate] <= active_tpt))) ||
 993                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
 994                      (tpt_tbl[rate] > active_tpt))) {
 995
 996                         /* (2nd or later pass)
 997                          * If we've already tried to raise the rate, and are
 998                          * now trying to lower it, use the higher rate. */
 999                         if (start_hi != IWL_RATE_INVALID) {
1000                                 new_rate = start_hi;
1001                                 break;
1002                         }
1003
1004                         new_rate = rate;
1005
1006                         /* Loop again with lower rate */
1007                         if (low != IWL_RATE_INVALID)
1008                                 rate = low;
1009
1010                         /* Lower rate not available, use the original */
1011                         else
1012                                 break;
1013
1014                 /* Else try to raise the "search" rate to match "active" */
1015                 } else {
1016                         /* (2nd or later pass)
1017                          * If we've already tried to lower the rate, and are
1018                          * now trying to raise it, use the lower rate. */
1019                         if (new_rate != IWL_RATE_INVALID)
1020                                 break;
1021
1022                         /* Loop again with higher rate */
1023                         else if (high != IWL_RATE_INVALID) {
1024                                 start_hi = high;
1025                                 rate = high;
1026
1027                         /* Higher rate not available, use the original */
1028                         } else {
1029                                 new_rate = rate;
1030                                 break;
1031                         }
1032                 }
1033         }
1034
1035         return new_rate;
1036 }
1037 #endif                          /* CONFIG_IWL4965_HT */
1038
1039 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1040 {
1041         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1042 }
1043
1044 /*
1045  * Set up search table for MIMO
1046  */
1047 static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1048                              struct iwl4965_rate_scale_priv *lq_data,
1049                              struct ieee80211_conf *conf,
1050                              struct sta_info *sta,
1051                              struct iwl4965_scale_tbl_info *tbl, int index)
1052 {
1053 #ifdef CONFIG_IWL4965_HT
1054         u16 rate_mask;
1055         s32 rate;
1056         s8 is_green = lq_data->is_green;
1057
1058         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1059             !sta->ht_info.ht_supported)
1060                 return -1;
1061
1062         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1063         tbl->lq_type = LQ_MIMO;
1064         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1065                                 &rate_mask);
1066
1067         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1068                 return -1;
1069
1070         /* Need both Tx chains/antennas to support MIMO */
1071         if (!rs_is_both_ant_supp(lq_data->antenna))
1072                 return -1;
1073
1074         tbl->is_dup = lq_data->is_dup;
1075         tbl->action = 0;
1076         if (priv->current_ht_config.supported_chan_width
1077             == IWL_CHANNEL_WIDTH_40MHZ)
1078                 tbl->is_fat = 1;
1079         else
1080                 tbl->is_fat = 0;
1081
1082         if (tbl->is_fat) {
1083                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1084                         tbl->is_SGI = 1;
1085                 else
1086                         tbl->is_SGI = 0;
1087         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1088                 tbl->is_SGI = 1;
1089         else
1090                 tbl->is_SGI = 0;
1091
1092         rs_get_expected_tpt_table(lq_data, tbl);
1093
1094         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1095
1096         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1097         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1098                 return -1;
1099         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1100
1101         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1102                      tbl->current_rate.rate_n_flags, is_green);
1103         return 0;
1104 #else
1105         return -1;
1106 #endif                          /*CONFIG_IWL4965_HT */
1107 }
1108
1109 /*
1110  * Set up search table for SISO
1111  */
1112 static int rs_switch_to_siso(struct iwl4965_priv *priv,
1113                              struct iwl4965_rate_scale_priv *lq_data,
1114                              struct ieee80211_conf *conf,
1115                              struct sta_info *sta,
1116                              struct iwl4965_scale_tbl_info *tbl, int index)
1117 {
1118 #ifdef CONFIG_IWL4965_HT
1119         u16 rate_mask;
1120         u8 is_green = lq_data->is_green;
1121         s32 rate;
1122
1123         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1124         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1125             !sta->ht_info.ht_supported)
1126                 return -1;
1127
1128         tbl->is_dup = lq_data->is_dup;
1129         tbl->lq_type = LQ_SISO;
1130         tbl->action = 0;
1131         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
1132                                 &rate_mask);
1133
1134         if (priv->current_ht_config.supported_chan_width
1135             == IWL_CHANNEL_WIDTH_40MHZ)
1136                 tbl->is_fat = 1;
1137         else
1138                 tbl->is_fat = 0;
1139
1140         if (tbl->is_fat) {
1141                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1142                         tbl->is_SGI = 1;
1143                 else
1144                         tbl->is_SGI = 0;
1145         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1146                 tbl->is_SGI = 1;
1147         else
1148                 tbl->is_SGI = 0;
1149
1150         if (is_green)
1151                 tbl->is_SGI = 0;
1152
1153         rs_get_expected_tpt_table(lq_data, tbl);
1154         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1155
1156         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1157         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1158                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1159                              rate, rate_mask);
1160                 return -1;
1161         }
1162         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1163         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1164                      tbl->current_rate.rate_n_flags, is_green);
1165         return 0;
1166 #else
1167         return -1;
1168
1169 #endif                          /*CONFIG_IWL4965_HT */
1170 }
1171
1172 /*
1173  * Try to switch to new modulation mode from legacy
1174  */
1175 static int rs_move_legacy_other(struct iwl4965_priv *priv,
1176                                 struct iwl4965_rate_scale_priv *lq_data,
1177                                 struct ieee80211_conf *conf,
1178                                 struct sta_info *sta,
1179                                 int index)
1180 {
1181         int ret = 0;
1182         struct iwl4965_scale_tbl_info *tbl =
1183             &(lq_data->lq_info[lq_data->active_tbl]);
1184         struct iwl4965_scale_tbl_info *search_tbl =
1185             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1186         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1187         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1188                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1189         u8 start_action = tbl->action;
1190
1191         for (; ;) {
1192                 switch (tbl->action) {
1193                 case IWL_LEGACY_SWITCH_ANTENNA:
1194                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1195
1196                         search_tbl->lq_type = LQ_NONE;
1197                         lq_data->action_counter++;
1198
1199                         /* Don't change antenna if success has been great */
1200                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1201                                 break;
1202
1203                         /* Don't change antenna if other one is not connected */
1204                         if (!rs_is_other_ant_connected(lq_data->antenna,
1205                                                         tbl->antenna_type))
1206                                 break;
1207
1208                         /* Set up search table to try other antenna */
1209                         memcpy(search_tbl, tbl, sz);
1210
1211                         rs_toggle_antenna(&(search_tbl->current_rate),
1212                                            search_tbl);
1213                         rs_get_expected_tpt_table(lq_data, search_tbl);
1214                         lq_data->search_better_tbl = 1;
1215                         goto out;
1216
1217                 case IWL_LEGACY_SWITCH_SISO:
1218                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1219
1220                         /* Set up search table to try SISO */
1221                         memcpy(search_tbl, tbl, sz);
1222                         search_tbl->lq_type = LQ_SISO;
1223                         search_tbl->is_SGI = 0;
1224                         search_tbl->is_fat = 0;
1225                         ret = rs_switch_to_siso(priv, lq_data, conf, sta,
1226                                                  search_tbl, index);
1227                         if (!ret) {
1228                                 lq_data->search_better_tbl = 1;
1229                                 lq_data->action_counter = 0;
1230                                 goto out;
1231                         }
1232
1233                         break;
1234                 case IWL_LEGACY_SWITCH_MIMO:
1235                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1236
1237                         /* Set up search table to try MIMO */
1238                         memcpy(search_tbl, tbl, sz);
1239                         search_tbl->lq_type = LQ_MIMO;
1240                         search_tbl->is_SGI = 0;
1241                         search_tbl->is_fat = 0;
1242                         search_tbl->antenna_type = ANT_BOTH;
1243                         ret = rs_switch_to_mimo(priv, lq_data, conf, sta,
1244                                                  search_tbl, index);
1245                         if (!ret) {
1246                                 lq_data->search_better_tbl = 1;
1247                                 lq_data->action_counter = 0;
1248                                 goto out;
1249                         }
1250                         break;
1251                 }
1252                 tbl->action++;
1253                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1254                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1255
1256                 if (tbl->action == start_action)
1257                         break;
1258
1259         }
1260         return 0;
1261
1262  out:
1263         tbl->action++;
1264         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1265                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1266         return 0;
1267
1268 }
1269
1270 /*
1271  * Try to switch to new modulation mode from SISO
1272  */
1273 static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1274                                  struct iwl4965_rate_scale_priv *lq_data,
1275                                  struct ieee80211_conf *conf,
1276                                  struct sta_info *sta,
1277                                  int index)
1278 {
1279         int ret;
1280         u8 is_green = lq_data->is_green;
1281         struct iwl4965_scale_tbl_info *tbl =
1282             &(lq_data->lq_info[lq_data->active_tbl]);
1283         struct iwl4965_scale_tbl_info *search_tbl =
1284             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1285         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1286         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1287                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1288         u8 start_action = tbl->action;
1289
1290         for (;;) {
1291                 lq_data->action_counter++;
1292                 switch (tbl->action) {
1293                 case IWL_SISO_SWITCH_ANTENNA:
1294                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1295                         search_tbl->lq_type = LQ_NONE;
1296                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1297                                 break;
1298                         if (!rs_is_other_ant_connected(lq_data->antenna,
1299                                                        tbl->antenna_type))
1300                                 break;
1301
1302                         memcpy(search_tbl, tbl, sz);
1303                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1304                         rs_toggle_antenna(&(search_tbl->current_rate),
1305                                            search_tbl);
1306                         lq_data->search_better_tbl = 1;
1307
1308                         goto out;
1309
1310                 case IWL_SISO_SWITCH_MIMO:
1311                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1312                         memcpy(search_tbl, tbl, sz);
1313                         search_tbl->lq_type = LQ_MIMO;
1314                         search_tbl->is_SGI = 0;
1315                         search_tbl->is_fat = 0;
1316                         search_tbl->antenna_type = ANT_BOTH;
1317                         ret = rs_switch_to_mimo(priv, lq_data, conf, sta,
1318                                                  search_tbl, index);
1319                         if (!ret) {
1320                                 lq_data->search_better_tbl = 1;
1321                                 goto out;
1322                         }
1323                         break;
1324                 case IWL_SISO_SWITCH_GI:
1325                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1326                         memcpy(search_tbl, tbl, sz);
1327                         search_tbl->action = 0;
1328                         if (search_tbl->is_SGI)
1329                                 search_tbl->is_SGI = 0;
1330                         else if (!is_green)
1331                                 search_tbl->is_SGI = 1;
1332                         else
1333                                 break;
1334                         lq_data->search_better_tbl = 1;
1335                         if ((tbl->lq_type == LQ_SISO) &&
1336                             (tbl->is_SGI)) {
1337                                 s32 tpt = lq_data->last_tpt / 100;
1338                                 if (((!tbl->is_fat) &&
1339                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1340                                     ((tbl->is_fat) &&
1341                                      (tpt >= expected_tpt_siso40MHz[index])))
1342                                         lq_data->search_better_tbl = 0;
1343                         }
1344                         rs_get_expected_tpt_table(lq_data, search_tbl);
1345                         rs_mcs_from_tbl(&search_tbl->current_rate,
1346                                              search_tbl, index, is_green);
1347                         goto out;
1348                 }
1349                 tbl->action++;
1350                 if (tbl->action > IWL_SISO_SWITCH_GI)
1351                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1352
1353                 if (tbl->action == start_action)
1354                         break;
1355         }
1356         return 0;
1357
1358  out:
1359         tbl->action++;
1360         if (tbl->action > IWL_SISO_SWITCH_GI)
1361                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1362         return 0;
1363 }
1364
1365 /*
1366  * Try to switch to new modulation mode from MIMO
1367  */
1368 static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1369                                  struct iwl4965_rate_scale_priv *lq_data,
1370                                  struct ieee80211_conf *conf,
1371                                  struct sta_info *sta,
1372                                  int index)
1373 {
1374         int ret;
1375         s8 is_green = lq_data->is_green;
1376         struct iwl4965_scale_tbl_info *tbl =
1377             &(lq_data->lq_info[lq_data->active_tbl]);
1378         struct iwl4965_scale_tbl_info *search_tbl =
1379             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1380         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1381                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1382         u8 start_action = tbl->action;
1383
1384         for (;;) {
1385                 lq_data->action_counter++;
1386                 switch (tbl->action) {
1387                 case IWL_MIMO_SWITCH_ANTENNA_A:
1388                 case IWL_MIMO_SWITCH_ANTENNA_B:
1389                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1390
1391                         /* Set up new search table for SISO */
1392                         memcpy(search_tbl, tbl, sz);
1393                         search_tbl->lq_type = LQ_SISO;
1394                         search_tbl->is_SGI = 0;
1395                         search_tbl->is_fat = 0;
1396                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1397                                 search_tbl->antenna_type = ANT_MAIN;
1398                         else
1399                                 search_tbl->antenna_type = ANT_AUX;
1400
1401                         ret = rs_switch_to_siso(priv, lq_data, conf, sta,
1402                                                  search_tbl, index);
1403                         if (!ret) {
1404                                 lq_data->search_better_tbl = 1;
1405                                 goto out;
1406                         }
1407                         break;
1408
1409                 case IWL_MIMO_SWITCH_GI:
1410                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1411
1412                         /* Set up new search table for MIMO */
1413                         memcpy(search_tbl, tbl, sz);
1414                         search_tbl->lq_type = LQ_MIMO;
1415                         search_tbl->antenna_type = ANT_BOTH;
1416                         search_tbl->action = 0;
1417                         if (search_tbl->is_SGI)
1418                                 search_tbl->is_SGI = 0;
1419                         else
1420                                 search_tbl->is_SGI = 1;
1421                         lq_data->search_better_tbl = 1;
1422
1423                         /*
1424                          * If active table already uses the fastest possible
1425                          * modulation (dual stream with short guard interval),
1426                          * and it's working well, there's no need to look
1427                          * for a better type of modulation!
1428                          */
1429                         if ((tbl->lq_type == LQ_MIMO) &&
1430                             (tbl->is_SGI)) {
1431                                 s32 tpt = lq_data->last_tpt / 100;
1432                                 if (((!tbl->is_fat) &&
1433                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1434                                     ((tbl->is_fat) &&
1435                                      (tpt >= expected_tpt_mimo40MHz[index])))
1436                                         lq_data->search_better_tbl = 0;
1437                         }
1438                         rs_get_expected_tpt_table(lq_data, search_tbl);
1439                         rs_mcs_from_tbl(&search_tbl->current_rate,
1440                                              search_tbl, index, is_green);
1441                         goto out;
1442
1443                 }
1444                 tbl->action++;
1445                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1446                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1447
1448                 if (tbl->action == start_action)
1449                         break;
1450         }
1451
1452         return 0;
1453  out:
1454         tbl->action++;
1455         if (tbl->action > IWL_MIMO_SWITCH_GI)
1456                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1457         return 0;
1458
1459 }
1460
1461 /*
1462  * Check whether we should continue using same modulation mode, or
1463  * begin search for a new mode, based on:
1464  * 1) # tx successes or failures while using this mode
1465  * 2) # times calling this function
1466  * 3) elapsed time in this mode (not used, for now)
1467  */
1468 static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
1469 {
1470         struct iwl4965_scale_tbl_info *tbl;
1471         int i;
1472         int active_tbl;
1473         int flush_interval_passed = 0;
1474
1475         active_tbl = lq_data->active_tbl;
1476
1477         tbl = &(lq_data->lq_info[active_tbl]);
1478
1479         /* If we've been disallowing search, see if we should now allow it */
1480         if (lq_data->stay_in_tbl) {
1481
1482                 /* Elapsed time using current modulation mode */
1483                 if (lq_data->flush_timer)
1484                         flush_interval_passed =
1485                             time_after(jiffies,
1486                                        (unsigned long)(lq_data->flush_timer +
1487                                         IWL_RATE_SCALE_FLUSH_INTVL));
1488
1489                 /* For now, disable the elapsed time criterion */
1490                 flush_interval_passed = 0;
1491
1492                 /*
1493                  * Check if we should allow search for new modulation mode.
1494                  * If many frames have failed or succeeded, or we've used
1495                  * this same modulation for a long time, allow search, and
1496                  * reset history stats that keep track of whether we should
1497                  * allow a new search.  Also (below) reset all bitmaps and
1498                  * stats in active history.
1499                  */
1500                 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1501                     (lq_data->total_success > lq_data->max_success_limit) ||
1502                     ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1503                      && (flush_interval_passed))) {
1504                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1505                                      lq_data->total_failed,
1506                                      lq_data->total_success,
1507                                      flush_interval_passed);
1508
1509                         /* Allow search for new mode */
1510                         lq_data->stay_in_tbl = 0;       /* only place reset */
1511                         lq_data->total_failed = 0;
1512                         lq_data->total_success = 0;
1513                         lq_data->flush_timer = 0;
1514
1515                 /*
1516                  * Else if we've used this modulation mode enough repetitions
1517                  * (regardless of elapsed time or success/failure), reset
1518                  * history bitmaps and rate-specific stats for all rates in
1519                  * active table.
1520                  */
1521                 } else {
1522                         lq_data->table_count++;
1523                         if (lq_data->table_count >=
1524                             lq_data->table_count_limit) {
1525                                 lq_data->table_count = 0;
1526
1527                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1528                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1529                                         rs_rate_scale_clear_window(
1530                                                 &(tbl->win[i]));
1531                         }
1532                 }
1533
1534                 /* If transitioning to allow "search", reset all history
1535                  * bitmaps and stats in active table (this will become the new
1536                  * "search" table). */
1537                 if (!lq_data->stay_in_tbl) {
1538                         for (i = 0; i < IWL_RATE_COUNT; i++)
1539                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1540                 }
1541         }
1542 }
1543
1544 /*
1545  * Do rate scaling and search for new modulation mode.
1546  */
1547 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1548                                   struct net_device *dev,
1549                                   struct ieee80211_hdr *hdr,
1550                                   struct sta_info *sta)
1551 {
1552         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1553         struct ieee80211_hw *hw = local_to_hw(local);
1554         struct ieee80211_conf *conf = &hw->conf;
1555         int low = IWL_RATE_INVALID;
1556         int high = IWL_RATE_INVALID;
1557         int index;
1558         int i;
1559         struct iwl4965_rate_scale_data *window = NULL;
1560         int current_tpt = IWL_INVALID_VALUE;
1561         int low_tpt = IWL_INVALID_VALUE;
1562         int high_tpt = IWL_INVALID_VALUE;
1563         u32 fail_count;
1564         s8 scale_action = 0;
1565         u16 fc, rate_mask;
1566         u8 update_lq = 0;
1567         struct iwl4965_rate_scale_priv *lq_data;
1568         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1569         u16 rate_scale_index_msk = 0;
1570         struct iwl4965_rate mcs_rate;
1571         u8 is_green = 0;
1572         u8 active_tbl = 0;
1573         u8 done_search = 0;
1574         u16 high_low;
1575
1576         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1577
1578         fc = le16_to_cpu(hdr->frame_control);
1579         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1580                 /* Send management frames and broadcast/multicast data using
1581                  * lowest rate. */
1582                 /* TODO: this could probably be improved.. */
1583                 return;
1584         }
1585
1586         if (!sta || !sta->rate_ctrl_priv)
1587                 return;
1588
1589         if (!priv->lq_mngr.lq_ready) {
1590                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1591                 return;
1592         }
1593         lq_data = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1594
1595         /*
1596          * Select rate-scale / modulation-mode table to work with in
1597          * the rest of this function:  "search" if searching for better
1598          * modulation mode, or "active" if doing rate scaling within a mode.
1599          */
1600         if (!lq_data->search_better_tbl)
1601                 active_tbl = lq_data->active_tbl;
1602         else
1603                 active_tbl = 1 - lq_data->active_tbl;
1604
1605         tbl = &(lq_data->lq_info[active_tbl]);
1606         is_green = lq_data->is_green;
1607
1608         /* current tx rate */
1609         index = sta->last_txrate;
1610
1611         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1612                        tbl->lq_type);
1613
1614         /* rates available for this association, and for modulation mode */
1615         rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1616                                 &rate_mask);
1617
1618         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1619
1620         /* mask with station rate restriction */
1621         if (is_legacy(tbl->lq_type)) {
1622                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1623                         /* supp_rates has no CCK bits in A mode */
1624                         rate_scale_index_msk = (u16) (rate_mask &
1625                                 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1626                 else
1627                         rate_scale_index_msk = (u16) (rate_mask &
1628                                                       lq_data->supp_rates);
1629
1630         } else
1631                 rate_scale_index_msk = rate_mask;
1632
1633         if (!rate_scale_index_msk)
1634                 rate_scale_index_msk = rate_mask;
1635
1636         /* If current rate is no longer supported on current association,
1637          * or user changed preferences for rates, find a new supported rate. */
1638         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1639                 index = IWL_INVALID_VALUE;
1640                 update_lq = 1;
1641
1642                 /* get the highest available rate */
1643                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1644                         if ((1 << i) & rate_scale_index_msk)
1645                                 index = i;
1646                 }
1647
1648                 if (index == IWL_INVALID_VALUE) {
1649                         IWL_WARNING("Can not find a suitable rate\n");
1650                         return;
1651                 }
1652         }
1653
1654         /* Get expected throughput table and history window for current rate */
1655         if (!tbl->expected_tpt)
1656                 rs_get_expected_tpt_table(lq_data, tbl);
1657
1658         window = &(tbl->win[index]);
1659
1660         /*
1661          * If there is not enough history to calculate actual average
1662          * throughput, keep analyzing results of more tx frames, without
1663          * changing rate or mode (bypass most of the rest of this function).
1664          * Set up new rate table in uCode only if old rate is not supported
1665          * in current association (use new rate found above).
1666          */
1667         fail_count = window->counter - window->success_counter;
1668         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1669              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1670             || (tbl->expected_tpt == NULL)) {
1671                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1672                                "for index %d\n",
1673                                window->success_counter, window->counter, index);
1674
1675                 /* Can't calculate this yet; not enough history */
1676                 window->average_tpt = IWL_INVALID_VALUE;
1677
1678                 /* Should we stay with this modulation mode,
1679                  * or search for a new one? */
1680                 rs_stay_in_table(lq_data);
1681
1682                 /* Set up new rate table in uCode, if needed */
1683                 if (update_lq) {
1684                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1685                         rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1686                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1687                 }
1688                 goto out;
1689
1690         /* Else we have enough samples; calculate estimate of
1691          * actual average throughput */
1692         } else
1693                 window->average_tpt = ((window->success_ratio *
1694                                         tbl->expected_tpt[index] + 64) / 128);
1695
1696         /* If we are searching for better modulation mode, check success. */
1697         if (lq_data->search_better_tbl) {
1698                 int success_limit = IWL_RATE_SCALE_SWITCH;
1699
1700                 /* If good success, continue using the "search" mode;
1701                  * no need to send new link quality command, since we're
1702                  * continuing to use the setup that we've been trying. */
1703                 if ((window->success_ratio > success_limit) ||
1704                     (window->average_tpt > lq_data->last_tpt)) {
1705                         if (!is_legacy(tbl->lq_type)) {
1706                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1707                                              " rate suc %d current tpt %d"
1708                                              " old tpt %d\n",
1709                                              window->success_ratio,
1710                                              window->average_tpt,
1711                                              lq_data->last_tpt);
1712                                 lq_data->enable_counter = 1;
1713                         }
1714                         /* Swap tables; "search" becomes "active" */
1715                         lq_data->active_tbl = active_tbl;
1716                         current_tpt = window->average_tpt;
1717
1718                 /* Else poor success; go back to mode in "active" table */
1719                 } else {
1720                         /* Nullify "search" table */
1721                         tbl->lq_type = LQ_NONE;
1722
1723                         /* Revert to "active" table */
1724                         active_tbl = lq_data->active_tbl;
1725                         tbl = &(lq_data->lq_info[active_tbl]);
1726
1727                         /* Revert to "active" rate and throughput info */
1728                         index = iwl4965_rate_index_from_plcp(
1729                                 tbl->current_rate.rate_n_flags);
1730                         current_tpt = lq_data->last_tpt;
1731
1732                         /* Need to set up a new rate table in uCode */
1733                         update_lq = 1;
1734                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1735                 }
1736
1737                 /* Either way, we've made a decision; modulation mode
1738                  * search is done, allow rate adjustment next time. */
1739                 lq_data->search_better_tbl = 0;
1740                 done_search = 1;        /* Don't switch modes below! */
1741                 goto lq_update;
1742         }
1743
1744         /* (Else) not in search of better modulation mode, try for better
1745          * starting rate, while staying in this mode. */
1746         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1747                                         tbl->lq_type);
1748         low = high_low & 0xff;
1749         high = (high_low >> 8) & 0xff;
1750
1751         /* Collect measured throughputs for current and adjacent rates */
1752         current_tpt = window->average_tpt;
1753         if (low != IWL_RATE_INVALID)
1754                 low_tpt = tbl->win[low].average_tpt;
1755         if (high != IWL_RATE_INVALID)
1756                 high_tpt = tbl->win[high].average_tpt;
1757
1758         /* Assume rate increase */
1759         scale_action = 1;
1760
1761         /* Too many failures, decrease rate */
1762         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1763             (current_tpt == 0)) {
1764                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1765                 scale_action = -1;
1766
1767         /* No throughput measured yet for adjacent rates; try increase. */
1768         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1769                    (high_tpt == IWL_INVALID_VALUE))
1770                 scale_action = 1;
1771
1772         /* Both adjacent throughputs are measured, but neither one has better
1773          * throughput; we're using the best rate, don't change it! */
1774         else if ((low_tpt != IWL_INVALID_VALUE) &&
1775                  (high_tpt != IWL_INVALID_VALUE) &&
1776                  (low_tpt < current_tpt) &&
1777                  (high_tpt < current_tpt))
1778                 scale_action = 0;
1779
1780         /* At least one adjacent rate's throughput is measured,
1781          * and may have better performance. */
1782         else {
1783                 /* Higher adjacent rate's throughput is measured */
1784                 if (high_tpt != IWL_INVALID_VALUE) {
1785                         /* Higher rate has better throughput */
1786                         if (high_tpt > current_tpt)
1787                                 scale_action = 1;
1788                         else {
1789                                 IWL_DEBUG_RATE
1790                                     ("decrease rate because of high tpt\n");
1791                                 scale_action = -1;
1792                         }
1793
1794                 /* Lower adjacent rate's throughput is measured */
1795                 } else if (low_tpt != IWL_INVALID_VALUE) {
1796                         /* Lower rate has better throughput */
1797                         if (low_tpt > current_tpt) {
1798                                 IWL_DEBUG_RATE
1799                                     ("decrease rate because of low tpt\n");
1800                                 scale_action = -1;
1801                         } else
1802                                 scale_action = 1;
1803                 }
1804         }
1805
1806         /* Sanity check; asked for decrease, but success rate or throughput
1807          * has been good at old rate.  Don't change it. */
1808         if (scale_action == -1) {
1809                 if ((low != IWL_RATE_INVALID) &&
1810                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1811                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1812                         scale_action = 0;
1813
1814         /* Sanity check; asked for increase, but success rate has not been great
1815          * even at old rate, higher rate will be worse.  Don't change it. */
1816         } else if ((scale_action == 1) &&
1817                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1818                 scale_action = 0;
1819
1820         switch (scale_action) {
1821         case -1:
1822                 /* Decrease starting rate, update uCode's rate table */
1823                 if (low != IWL_RATE_INVALID) {
1824                         update_lq = 1;
1825                         index = low;
1826                 }
1827                 break;
1828         case 1:
1829                 /* Increase starting rate, update uCode's rate table */
1830                 if (high != IWL_RATE_INVALID) {
1831                         update_lq = 1;
1832                         index = high;
1833                 }
1834
1835                 break;
1836         case 0:
1837                 /* No change */
1838         default:
1839                 break;
1840         }
1841
1842         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1843                     "high %d type %d\n",
1844                      index, scale_action, low, high, tbl->lq_type);
1845
1846  lq_update:
1847         /* Replace uCode's rate table for the destination station. */
1848         if (update_lq) {
1849                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1850                 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1851                 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1852         }
1853
1854         /* Should we stay with this modulation mode, or search for a new one? */
1855         rs_stay_in_table(lq_data);
1856
1857         /*
1858          * Search for new modulation mode if we're:
1859          * 1)  Not changing rates right now
1860          * 2)  Not just finishing up a search
1861          * 3)  Allowing a new search
1862          */
1863         if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1864                 /* Save current throughput to compare with "search" throughput*/
1865                 lq_data->last_tpt = current_tpt;
1866
1867                 /* Select a new "search" modulation mode to try.
1868                  * If one is found, set up the new "search" table. */
1869                 if (is_legacy(tbl->lq_type))
1870                         rs_move_legacy_other(priv, lq_data, conf, sta, index);
1871                 else if (is_siso(tbl->lq_type))
1872                         rs_move_siso_to_other(priv, lq_data, conf, sta, index);
1873                 else
1874                         rs_move_mimo_to_other(priv, lq_data, conf, sta, index);
1875
1876                 /* If new "search" mode was selected, set up in uCode table */
1877                 if (lq_data->search_better_tbl) {
1878                         /* Access the "search" table, clear its history. */
1879                         tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1880                         for (i = 0; i < IWL_RATE_COUNT; i++)
1881                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1882
1883                         /* Use new "search" start rate */
1884                         index = iwl4965_rate_index_from_plcp(
1885                                         tbl->current_rate.rate_n_flags);
1886
1887                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1888                                      tbl->current_rate.rate_n_flags, index);
1889                         rs_fill_link_cmd(lq_data, &tbl->current_rate,
1890                                          &lq_data->lq);
1891                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1892                 }
1893
1894                 /* If the "active" (non-search) mode was legacy,
1895                  * and we've tried switching antennas,
1896                  * but we haven't been able to try HT modes (not available),
1897                  * stay with best antenna legacy modulation for a while
1898                  * before next round of mode comparisons. */
1899                 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1900                 if (is_legacy(tbl1->lq_type) &&
1901 #ifdef CONFIG_IWL4965_HT
1902                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1903 #endif
1904                     (lq_data->action_counter >= 1)) {
1905                         lq_data->action_counter = 0;
1906                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1907                         rs_set_stay_in_table(1, lq_data);
1908                 }
1909
1910                 /* If we're in an HT mode, and all 3 mode switch actions
1911                  * have been tried and compared, stay in this best modulation
1912                  * mode for a while before next round of mode comparisons. */
1913                 if (lq_data->enable_counter &&
1914                     (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1915 #ifdef CONFIG_IWL4965_HT_AGG
1916                         /* If appropriate, set up aggregation! */
1917                         if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1918                             (priv->lq_mngr.agg_ctrl.auto_agg)) {
1919                                 priv->lq_mngr.agg_ctrl.tid_retry =
1920                                     TID_ALL_SPECIFIED;
1921                                 schedule_work(&priv->agg_work);
1922                         }
1923 #endif /*CONFIG_IWL4965_HT_AGG */
1924                         lq_data->action_counter = 0;
1925                         rs_set_stay_in_table(0, lq_data);
1926                 }
1927
1928         /*
1929          * Else, don't search for a new modulation mode.
1930          * Put new timestamp in stay-in-modulation-mode flush timer if:
1931          * 1)  Not changing rates right now
1932          * 2)  Not just finishing up a search
1933          * 3)  flush timer is empty
1934          */
1935         } else {
1936                 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1937                         lq_data->flush_timer = jiffies;
1938         }
1939
1940 out:
1941         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1942         i = index;
1943         sta->last_txrate = i;
1944
1945         /* sta->txrate is an index to A mode rates which start
1946          * at IWL_FIRST_OFDM_RATE
1947          */
1948         if (lq_data->phymode == (u8) MODE_IEEE80211A)
1949                 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1950         else
1951                 sta->txrate = i;
1952
1953         return;
1954 }
1955
1956
1957 static void rs_initialize_lq(struct iwl4965_priv *priv,
1958                              struct ieee80211_conf *conf,
1959                              struct sta_info *sta)
1960 {
1961         int i;
1962         struct iwl4965_rate_scale_priv *lq;
1963         struct iwl4965_scale_tbl_info *tbl;
1964         u8 active_tbl = 0;
1965         int rate_idx;
1966         u8 use_green = rs_use_green(priv, conf);
1967         struct iwl4965_rate mcs_rate;
1968
1969         if (!sta || !sta->rate_ctrl_priv)
1970                 goto out;
1971
1972         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
1973         i = sta->last_txrate;
1974
1975         if ((lq->lq.sta_id == 0xff) &&
1976             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1977                 goto out;
1978
1979         if (!lq->search_better_tbl)
1980                 active_tbl = lq->active_tbl;
1981         else
1982                 active_tbl = 1 - lq->active_tbl;
1983
1984         tbl = &(lq->lq_info[active_tbl]);
1985
1986         if ((i < 0) || (i >= IWL_RATE_COUNT))
1987                 i = 0;
1988
1989         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
1990         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1991         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1992
1993         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1994                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1995
1996         tbl->antenna_type = ANT_AUX;
1997         rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1998         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1999             rs_toggle_antenna(&mcs_rate, tbl);
2000
2001         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2002         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2003         rs_get_expected_tpt_table(lq, tbl);
2004         rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
2005         rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
2006  out:
2007         return;
2008 }
2009
2010 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2011                         struct ieee80211_hw_mode *mode, struct sk_buff *skb,
2012                         struct rate_selection *sel)
2013 {
2014
2015         int i;
2016         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2017         struct ieee80211_conf *conf = &local->hw.conf;
2018         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2019         struct sta_info *sta;
2020         u16 fc;
2021         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2022         struct iwl4965_rate_scale_priv *lq;
2023
2024         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2025
2026         sta = sta_info_get(local, hdr->addr1);
2027
2028         /* Send management frames and broadcast/multicast data using lowest
2029          * rate. */
2030         fc = le16_to_cpu(hdr->frame_control);
2031         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2032             !sta || !sta->rate_ctrl_priv) {
2033                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2034                 if (sta)
2035                         sta_info_put(sta);
2036                 return;
2037         }
2038
2039         lq = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
2040         i = sta->last_txrate;
2041
2042         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
2043                 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2044                 DECLARE_MAC_BUF(mac);
2045
2046                 if (sta_id == IWL_INVALID_STATION) {
2047                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2048                                        print_mac(mac, hdr->addr1));
2049                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2050                                                         0, CMD_ASYNC, NULL);
2051                 }
2052                 if ((sta_id != IWL_INVALID_STATION)) {
2053                         lq->lq.sta_id = sta_id;
2054                         lq->lq.rs_table[0].rate_n_flags = 0;
2055                         lq->ibss_sta_added = 1;
2056                         rs_initialize_lq(priv, conf, sta);
2057                 }
2058                 if (!lq->ibss_sta_added)
2059                         goto done;
2060         }
2061
2062  done:
2063         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2064                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2065                 return;
2066         }
2067         sta_info_put(sta);
2068
2069         sel->rate = &priv->ieee_rates[i];
2070 }
2071
2072 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2073 {
2074         struct iwl4965_rate_scale_priv *crl;
2075         int i, j;
2076
2077         IWL_DEBUG_RATE("create station rate scale window\n");
2078
2079         crl = kzalloc(sizeof(struct iwl4965_rate_scale_priv), gfp);
2080
2081         if (crl == NULL)
2082                 return NULL;
2083         crl->lq.sta_id = 0xff;
2084
2085
2086         for (j = 0; j < LQ_SIZE; j++)
2087                 for (i = 0; i < IWL_RATE_COUNT; i++)
2088                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2089
2090         return crl;
2091 }
2092
2093 static void rs_rate_init(void *priv_rate, void *priv_sta,
2094                          struct ieee80211_local *local,
2095                          struct sta_info *sta)
2096 {
2097         int i, j;
2098         struct ieee80211_conf *conf = &local->hw.conf;
2099         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2100         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2101         struct iwl4965_rate_scale_priv *crl = priv_sta;
2102
2103         crl->flush_timer = 0;
2104         crl->supp_rates = sta->supp_rates;
2105         sta->txrate = 3;
2106         for (j = 0; j < LQ_SIZE; j++)
2107                 for (i = 0; i < IWL_RATE_COUNT; i++)
2108                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
2109
2110         IWL_DEBUG_RATE("rate scale global init\n");
2111         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2112          * the lowest or the highest rate.. Could consider using RSSI from
2113          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2114          * after assoc.. */
2115
2116         crl->ibss_sta_added = 0;
2117         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2118                 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2119                 DECLARE_MAC_BUF(mac);
2120
2121                 /* for IBSS the call are from tasklet */
2122                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2123                              print_mac(mac, sta->addr));
2124
2125                 if (sta_id == IWL_INVALID_STATION) {
2126                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2127                                        print_mac(mac, sta->addr));
2128                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2129                                                         0, CMD_ASYNC, NULL);
2130                 }
2131                 if ((sta_id != IWL_INVALID_STATION)) {
2132                         crl->lq.sta_id = sta_id;
2133                         crl->lq.rs_table[0].rate_n_flags = 0;
2134                 }
2135                 /* FIXME: this is w/a remove it later */
2136                 priv->assoc_station_added = 1;
2137         }
2138
2139         /* Find highest tx rate supported by hardware and destination station */
2140         for (i = 0; i < mode->num_rates; i++) {
2141                 if ((sta->supp_rates & BIT(i)) &&
2142                     (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2143                         sta->txrate = i;
2144         }
2145         sta->last_txrate = sta->txrate;
2146         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2147         if (local->hw.conf.phymode == MODE_IEEE80211A)
2148                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
2149
2150         crl->is_dup = 0;
2151         crl->valid_antenna = priv->valid_antenna;
2152         crl->antenna = priv->antenna;
2153         crl->is_green = rs_use_green(priv, conf);
2154         crl->active_rate = priv->active_rate;
2155         crl->active_rate &= ~(0x1000);
2156         crl->active_rate_basic = priv->active_rate_basic;
2157         crl->phymode = priv->phymode;
2158 #ifdef CONFIG_IWL4965_HT
2159         /*
2160          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2161          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2162          */
2163         crl->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2164         crl->active_siso_rate |=
2165                         (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2166         crl->active_siso_rate &= ~((u16)0x2);
2167         crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
2168
2169         /* Same here */
2170         crl->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2171         crl->active_mimo_rate |=
2172                         (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2173         crl->active_mimo_rate &= ~((u16)0x2);
2174         crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2175         IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
2176                      crl->active_mimo_rate);
2177 #endif /*CONFIG_IWL4965_HT*/
2178 #ifdef CONFIG_MAC80211_DEBUGFS
2179         crl->drv = priv;
2180 #endif
2181
2182         if (priv->assoc_station_added)
2183                 priv->lq_mngr.lq_ready = 1;
2184
2185         rs_initialize_lq(priv, conf, sta);
2186 }
2187
2188 static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
2189                             struct iwl4965_rate *tx_mcs,
2190                             struct iwl4965_link_quality_cmd *lq_cmd)
2191 {
2192         int index = 0;
2193         int rate_idx;
2194         int repeat_rate = 0;
2195         u8 ant_toggle_count = 0;
2196         u8 use_ht_possible = 1;
2197         struct iwl4965_rate new_rate;
2198         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2199
2200         /* Override starting rate (index 0) if needed for debug purposes */
2201         rs_dbgfs_set_mcs(lq_data, tx_mcs, index);
2202
2203         /* Interpret rate_n_flags */
2204         rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
2205                                   &tbl_type, &rate_idx);
2206
2207         /* How many times should we repeat the initial rate? */
2208         if (is_legacy(tbl_type.lq_type)) {
2209                 ant_toggle_count = 1;
2210                 repeat_rate = IWL_NUMBER_TRY;
2211         } else
2212                 repeat_rate = IWL_HT_NUMBER_TRY;
2213
2214         lq_cmd->general_params.mimo_delimiter =
2215                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2216
2217         /* Fill 1st table entry (index 0) */
2218         lq_cmd->rs_table[index].rate_n_flags =
2219                         cpu_to_le32(tx_mcs->rate_n_flags);
2220         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2221
2222         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2223                 lq_cmd->general_params.single_stream_ant_msk
2224                         = LINK_QUAL_ANT_A_MSK;
2225         else
2226                 lq_cmd->general_params.single_stream_ant_msk
2227                         = LINK_QUAL_ANT_B_MSK;
2228
2229         index++;
2230         repeat_rate--;
2231
2232         /* Fill rest of rate table */
2233         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2234                 /* Repeat initial/next rate.
2235                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2236                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2237                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2238                         if (is_legacy(tbl_type.lq_type)) {
2239                                 if (ant_toggle_count <
2240                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2241                                         ant_toggle_count++;
2242                                 else {
2243                                         rs_toggle_antenna(&new_rate, &tbl_type);
2244                                         ant_toggle_count = 1;
2245                                 }
2246                         }
2247
2248                         /* Override next rate if needed for debug purposes */
2249                         rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2250
2251                         /* Fill next table entry */
2252                         lq_cmd->rs_table[index].rate_n_flags =
2253                                         cpu_to_le32(new_rate.rate_n_flags);
2254                         repeat_rate--;
2255                         index++;
2256                 }
2257
2258                 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
2259                                                 &rate_idx);
2260
2261                 /* Indicate to uCode which entries might be MIMO.
2262                  * If initial rate was MIMO, this will finally end up
2263                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2264                 if (is_mimo(tbl_type.lq_type))
2265                         lq_cmd->general_params.mimo_delimiter = index;
2266
2267                 /* Get next rate */
2268                 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
2269                                   use_ht_possible, &new_rate);
2270
2271                 /* How many times should we repeat the next rate? */
2272                 if (is_legacy(tbl_type.lq_type)) {
2273                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2274                                 ant_toggle_count++;
2275                         else {
2276                                 rs_toggle_antenna(&new_rate, &tbl_type);
2277                                 ant_toggle_count = 1;
2278                         }
2279                         repeat_rate = IWL_NUMBER_TRY;
2280                 } else
2281                         repeat_rate = IWL_HT_NUMBER_TRY;
2282
2283                 /* Don't allow HT rates after next pass.
2284                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2285                 use_ht_possible = 0;
2286
2287                 /* Override next rate if needed for debug purposes */
2288                 rs_dbgfs_set_mcs(lq_data, &new_rate, index);
2289
2290                 /* Fill next table entry */
2291                 lq_cmd->rs_table[index].rate_n_flags =
2292                                 cpu_to_le32(new_rate.rate_n_flags);
2293
2294                 index++;
2295                 repeat_rate--;
2296         }
2297
2298         lq_cmd->general_params.dual_stream_ant_msk = 3;
2299         lq_cmd->agg_params.agg_dis_start_th = 3;
2300         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2301 }
2302
2303 static void *rs_alloc(struct ieee80211_local *local)
2304 {
2305         return local->hw.priv;
2306 }
2307 /* rate scale requires free function to be implemented */
2308 static void rs_free(void *priv_rate)
2309 {
2310         return;
2311 }
2312
2313 static void rs_clear(void *priv_rate)
2314 {
2315         struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2316
2317         IWL_DEBUG_RATE("enter\n");
2318
2319         priv->lq_mngr.lq_ready = 0;
2320 #ifdef CONFIG_IWL4965_HT
2321 #ifdef CONFIG_IWL4965_HT_AGG
2322         if (priv->lq_mngr.agg_ctrl.granted_ba)
2323                 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2324 #endif /*CONFIG_IWL4965_HT_AGG */
2325 #endif /* CONFIG_IWL4965_HT */
2326
2327         IWL_DEBUG_RATE("leave\n");
2328 }
2329
2330 static void rs_free_sta(void *priv, void *priv_sta)
2331 {
2332         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2333
2334         IWL_DEBUG_RATE("enter\n");
2335         kfree(rs_priv);
2336         IWL_DEBUG_RATE("leave\n");
2337 }
2338
2339
2340 #ifdef CONFIG_MAC80211_DEBUGFS
2341 static int open_file_generic(struct inode *inode, struct file *file)
2342 {
2343         file->private_data = inode->i_private;
2344         return 0;
2345 }
2346 static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
2347                                 struct iwl4965_rate *mcs, int index)
2348 {
2349         u32 base_rate;
2350
2351         if (rs_priv->phymode == (u8) MODE_IEEE80211A)
2352                 base_rate = 0x800D;
2353         else
2354                 base_rate = 0x820A;
2355
2356         if (rs_priv->dbg_fixed.rate_n_flags) {
2357                 if (index < 12)
2358                         mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
2359                 else
2360                         mcs->rate_n_flags = base_rate;
2361                 IWL_DEBUG_RATE("Fixed rate ON\n");
2362                 return;
2363         }
2364
2365         IWL_DEBUG_RATE("Fixed rate OFF\n");
2366 }
2367
2368 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2369                         const char __user *user_buf, size_t count, loff_t *ppos)
2370 {
2371         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2372         char buf[64];
2373         int buf_size;
2374         u32 parsed_rate;
2375
2376         memset(buf, 0, sizeof(buf));
2377         buf_size = min(count, sizeof(buf) -  1);
2378         if (copy_from_user(buf, user_buf, buf_size))
2379                 return -EFAULT;
2380
2381         if (sscanf(buf, "%x", &parsed_rate) == 1)
2382                 rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
2383         else
2384                 rs_priv->dbg_fixed.rate_n_flags = 0;
2385
2386         rs_priv->active_rate = 0x0FFF;          /* 1 - 54 MBits, includes CCK */
2387         rs_priv->active_siso_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2388         rs_priv->active_mimo_rate = 0x1FD0;     /* 6 - 60 MBits, no 9, no CCK */
2389
2390         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2391                 rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
2392
2393         if (rs_priv->dbg_fixed.rate_n_flags) {
2394                 rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
2395                 rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
2396         }
2397
2398         return count;
2399 }
2400
2401 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2402                         char __user *user_buf, size_t count, loff_t *ppos)
2403 {
2404         char buff[1024];
2405         int desc = 0;
2406         int i = 0;
2407
2408         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2409
2410         desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2411         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2412                         rs_priv->total_failed, rs_priv->total_success,
2413                         rs_priv->active_rate);
2414         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2415                         rs_priv->dbg_fixed.rate_n_flags);
2416         desc += sprintf(buff+desc, "general:"
2417                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2418                 rs_priv->lq.general_params.flags,
2419                 rs_priv->lq.general_params.mimo_delimiter,
2420                 rs_priv->lq.general_params.single_stream_ant_msk,
2421                 rs_priv->lq.general_params.dual_stream_ant_msk);
2422
2423         desc += sprintf(buff+desc, "agg:"
2424                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2425                         le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2426                         rs_priv->lq.agg_params.agg_dis_start_th,
2427                         rs_priv->lq.agg_params.agg_frame_cnt_limit);
2428
2429         desc += sprintf(buff+desc,
2430                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2431                         rs_priv->lq.general_params.start_rate_index[0],
2432                         rs_priv->lq.general_params.start_rate_index[1],
2433                         rs_priv->lq.general_params.start_rate_index[2],
2434                         rs_priv->lq.general_params.start_rate_index[3]);
2435
2436
2437         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2438                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2439                         i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2440
2441         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2442 }
2443
2444 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2445         .write = rs_sta_dbgfs_scale_table_write,
2446         .read = rs_sta_dbgfs_scale_table_read,
2447         .open = open_file_generic,
2448 };
2449 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2450                         char __user *user_buf, size_t count, loff_t *ppos)
2451 {
2452         char buff[1024];
2453         int desc = 0;
2454         int i, j;
2455
2456         struct iwl4965_rate_scale_priv *rs_priv = file->private_data;
2457         for (i = 0; i < LQ_SIZE; i++) {
2458                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2459                                 "rate=0x%X\n",
2460                                 rs_priv->active_tbl == i?"*":"x",
2461                                 rs_priv->lq_info[i].lq_type,
2462                                 rs_priv->lq_info[i].is_SGI,
2463                                 rs_priv->lq_info[i].is_fat,
2464                                 rs_priv->lq_info[i].is_dup,
2465                                 rs_priv->lq_info[i].current_rate.rate_n_flags);
2466                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2467                         desc += sprintf(buff+desc,
2468                                         "counter=%d success=%d %%=%d\n",
2469                                         rs_priv->lq_info[i].win[j].counter,
2470                                         rs_priv->lq_info[i].win[j].success_counter,
2471                                         rs_priv->lq_info[i].win[j].success_ratio);
2472                 }
2473         }
2474         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2475 }
2476
2477 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2478         .read = rs_sta_dbgfs_stats_table_read,
2479         .open = open_file_generic,
2480 };
2481
2482 static void rs_add_debugfs(void *priv, void *priv_sta,
2483                                         struct dentry *dir)
2484 {
2485         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2486         rs_priv->rs_sta_dbgfs_scale_table_file =
2487                 debugfs_create_file("rate_scale_table", 0600, dir,
2488                                 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2489         rs_priv->rs_sta_dbgfs_stats_table_file =
2490                 debugfs_create_file("rate_stats_table", 0600, dir,
2491                         rs_priv, &rs_sta_dbgfs_stats_table_ops);
2492 }
2493
2494 static void rs_remove_debugfs(void *priv, void *priv_sta)
2495 {
2496         struct iwl4965_rate_scale_priv *rs_priv = priv_sta;
2497         debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2498         debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
2499 }
2500 #endif
2501
2502 static struct rate_control_ops rs_ops = {
2503         .module = NULL,
2504         .name = RS_NAME,
2505         .tx_status = rs_tx_status,
2506         .get_rate = rs_get_rate,
2507         .rate_init = rs_rate_init,
2508         .clear = rs_clear,
2509         .alloc = rs_alloc,
2510         .free = rs_free,
2511         .alloc_sta = rs_alloc_sta,
2512         .free_sta = rs_free_sta,
2513 #ifdef CONFIG_MAC80211_DEBUGFS
2514         .add_sta_debugfs = rs_add_debugfs,
2515         .remove_sta_debugfs = rs_remove_debugfs,
2516 #endif
2517 };
2518
2519 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2520 {
2521         struct ieee80211_local *local = hw_to_local(hw);
2522         struct iwl4965_priv *priv = hw->priv;
2523         struct iwl4965_rate_scale_priv *rs_priv;
2524         struct sta_info *sta;
2525         int count = 0, i;
2526         u32 samples = 0, success = 0, good = 0;
2527         unsigned long now = jiffies;
2528         u32 max_time = 0;
2529         u8 lq_type, antenna;
2530
2531         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2532         if (!sta || !sta->rate_ctrl_priv) {
2533                 if (sta) {
2534                         sta_info_put(sta);
2535                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2536                 } else
2537                         IWL_DEBUG_RATE("leave - no station!\n");
2538                 return sprintf(buf, "station %d not found\n", sta_id);
2539         }
2540
2541         rs_priv = (void *)sta->rate_ctrl_priv;
2542
2543         lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2544         antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2545
2546         if (is_legacy(lq_type))
2547                 i = IWL_RATE_54M_INDEX;
2548         else
2549                 i = IWL_RATE_60M_INDEX;
2550         while (1) {
2551                 u64 mask;
2552                 int j;
2553                 int active = rs_priv->active_tbl;
2554
2555                 count +=
2556                     sprintf(&buf[count], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2557
2558                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2559                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2560                         buf[count++] =
2561                                 (rs_priv->lq_info[active].win[i].data & mask)
2562                                 ? '1' : '0';
2563
2564                 samples += rs_priv->lq_info[active].win[i].counter;
2565                 good += rs_priv->lq_info[active].win[i].success_counter;
2566                 success += rs_priv->lq_info[active].win[i].success_counter *
2567                            iwl4965_rates[i].ieee;
2568
2569                 if (rs_priv->lq_info[active].win[i].stamp) {
2570                         int delta =
2571                                    jiffies_to_msecs(now -
2572                                    rs_priv->lq_info[active].win[i].stamp);
2573
2574                         if (delta > max_time)
2575                                 max_time = delta;
2576
2577                         count += sprintf(&buf[count], "%5dms\n", delta);
2578                 } else
2579                         buf[count++] = '\n';
2580
2581                 j = iwl4965_get_prev_ieee_rate(i);
2582                 if (j == i)
2583                         break;
2584                 i = j;
2585         }
2586
2587         /* Display the average rate of all samples taken.
2588          *
2589          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2590          * added from iwl4965_rates is actually 2X the rate */
2591         if (samples)
2592                 count += sprintf(&buf[count],
2593                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2594                          "%3d%% success (%d good packets over %d tries)\n",
2595                          success / (2 * samples), (success * 5 / samples) % 10,
2596                          max_time, good * 100 / samples, good, samples);
2597         else
2598                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2599         count += sprintf(&buf[count], "\nrate scale type %d antenna %d "
2600                          "active_search %d rate index %d\n", lq_type, antenna,
2601                          rs_priv->search_better_tbl, sta->last_txrate);
2602
2603         sta_info_put(sta);
2604         return count;
2605 }
2606
2607 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2608 {
2609         struct iwl4965_priv *priv = hw->priv;
2610
2611         priv->lq_mngr.lq_ready = 1;
2612 }
2613
2614 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2615 {
2616         ieee80211_rate_control_register(&rs_ops);
2617 }
2618
2619 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2620 {
2621         ieee80211_rate_control_unregister(&rs_ops);
2622 }
2623