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_lq_sta {
 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_lq_sta *lq_sta,
 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_lq_sta *lq_sta,
 158                                 struct iwl4965_rate *mcs, int index);
 159 #else
 160 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
 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, int retries,
 281                               int successes)
 282 {
 283         struct iwl4965_rate_scale_data *window = NULL;
 284         u64 mask;
 285         u8 win_size = IWL_RATE_MAX_WINDOW;
 286         s32 fail_count;
 287
 288         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 289                 return -EINVAL;
 290
 291         /* Select data for current tx bit rate */
 292         window = &(windows[scale_index]);
 293
 294         /*
 295          * Keep track of only the latest 62 tx frame attempts in this rate's
 296          * history window; anything older isn't really relevant any more.
 297          * If we have filled up the sliding window, drop the oldest attempt;
 298          * if the oldest attempt (highest bit in bitmap) shows "success",
 299          * subtract "1" from the success counter (this is the main reason
 300          * we keep these bitmaps!).
 301          */
 302         while (retries > 0) {
 303                 if (window->counter >= win_size) {
 304                         window->counter = win_size - 1;
 305                         mask = 1;
 306                         mask = (mask << (win_size - 1));
 307                         if (window->data & mask) {
 308                                 window->data &= ~mask;
 309                                 window->success_counter =
 310                                         window->success_counter - 1;
 311                         }
 312                 }
 313
 314                 /* Increment frames-attempted counter */
 315                 window->counter++;
 316
 317                 /* Shift bitmap by one frame (throw away oldest history),
 318                  * OR in "1", and increment "success" if this
 319                  * frame was successful. */
 320                 mask = window->data;
 321                 window->data = (mask << 1);
 322                 if (successes > 0) {
 323                         window->success_counter = window->success_counter + 1;
 324                         window->data |= 0x1;
 325                         successes--;
 326                 }
 327
 328                 retries--;
 329         }
 330
 331         /* Calculate current success ratio, avoid divide-by-0! */
 332         if (window->counter > 0)
 333                 window->success_ratio = 128 * (100 * window->success_counter)
 334                                         / window->counter;
 335         else
 336                 window->success_ratio = IWL_INVALID_VALUE;
 337
 338         fail_count = window->counter - window->success_counter;
 339
 340         /* Calculate average throughput, if we have enough history. */
 341         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 342             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 343                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 344         else
 345                 window->average_tpt = IWL_INVALID_VALUE;
 346
 347         /* Tag this window as having been updated */
 348         window->stamp = jiffies;
 349
 350         return 0;
 351 }
 352
 353 /*
 354  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 355  */
 356 static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
 357                            struct iwl4965_scale_tbl_info *tbl,
 358                            int index, u8 use_green)
 359 {
 360         if (is_legacy(tbl->lq_type)) {
 361                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
 362                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 363                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 364
 365         } else if (is_siso(tbl->lq_type)) {
 366                 if (index > IWL_LAST_OFDM_RATE)
 367                         index = IWL_LAST_OFDM_RATE;
 368                  mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
 369                                           RATE_MCS_HT_MSK;
 370         } else {
 371                 if (index > IWL_LAST_OFDM_RATE)
 372                         index = IWL_LAST_OFDM_RATE;
 373                 mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
 374                                          RATE_MCS_HT_MSK;
 375         }
 376
 377         switch (tbl->antenna_type) {
 378         case ANT_BOTH:
 379                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
 380                 break;
 381         case ANT_MAIN:
 382                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 383                 break;
 384         case ANT_AUX:
 385                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 386                 break;
 387         case ANT_NONE:
 388                 break;
 389         }
 390
 391         if (is_legacy(tbl->lq_type))
 392                 return;
 393
 394         if (tbl->is_fat) {
 395                 if (tbl->is_dup)
 396                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 397                 else
 398                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 399         }
 400         if (tbl->is_SGI)
 401                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 402
 403         if (use_green) {
 404                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 405                 if (is_siso(tbl->lq_type))
 406                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 407         }
 408 }
 409
 410 /*
 411  * Interpret uCode API's rate_n_flags format,
 412  * fill "search" or "active" tx mode table.
 413  */
 414 static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
 415                                     int phymode, struct iwl4965_scale_tbl_info *tbl,
 416                                     int *rate_idx)
 417 {
 418         int index;
 419         u32 ant_msk;
 420
 421         index = iwl4965_rate_index_from_plcp(mcs_rate->rate_n_flags);
 422
 423         if (index  == IWL_RATE_INVALID) {
 424                 *rate_idx = -1;
 425                 return -EINVAL;
 426         }
 427         tbl->is_SGI = 0;        /* default legacy setup */
 428         tbl->is_fat = 0;
 429         tbl->is_dup = 0;
 430         tbl->antenna_type = ANT_BOTH;   /* default MIMO setup */
 431
 432         /* legacy rate format */
 433         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 434                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 435
 436                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 437                         tbl->lq_type = LQ_NONE;
 438                 else {
 439
 440                         if (phymode == MODE_IEEE80211A)
 441                                 tbl->lq_type = LQ_A;
 442                         else
 443                                 tbl->lq_type = LQ_G;
 444
 445                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 446                                 tbl->antenna_type = ANT_MAIN;
 447                         else
 448                                 tbl->antenna_type = ANT_AUX;
 449                 }
 450                 *rate_idx = index;
 451
 452         /* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
 453         } else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
 454                                         <= IWL_RATE_SISO_60M_PLCP) {
 455                 tbl->lq_type = LQ_SISO;
 456
 457                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 458                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 459                         tbl->lq_type = LQ_NONE;
 460                 else {
 461                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 462                                 tbl->antenna_type = ANT_MAIN;
 463                         else
 464                                 tbl->antenna_type = ANT_AUX;
 465                 }
 466                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 467                         tbl->is_SGI = 1;
 468
 469                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 470                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 471                         tbl->is_fat = 1;
 472
 473                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 474                         tbl->is_dup = 1;
 475
 476                 *rate_idx = index;
 477
 478         /* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
 479         } else {
 480                 tbl->lq_type = LQ_MIMO;
 481                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 482                         tbl->is_SGI = 1;
 483
 484                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 485                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 486                         tbl->is_fat = 1;
 487
 488                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 489                         tbl->is_dup = 1;
 490                 *rate_idx = index;
 491         }
 492         return 0;
 493 }
 494
 495 static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
 496                                      struct iwl4965_scale_tbl_info *tbl)
 497 {
 498         if (tbl->antenna_type == ANT_AUX) {
 499                 tbl->antenna_type = ANT_MAIN;
 500                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
 501                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 502         } else {
 503                 tbl->antenna_type = ANT_AUX;
 504                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
 505                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 506         }
 507 }
 508
 509 static inline u8 rs_use_green(struct iwl4965_priv *priv,
 510                               struct ieee80211_conf *conf)
 511 {
 512 #ifdef CONFIG_IWL4965_HT
 513         return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
 514                 priv->current_ht_config.is_green_field &&
 515                 !priv->current_ht_config.non_GF_STA_present);
 516 #endif  /* CONFIG_IWL4965_HT */
 517         return 0;
 518 }
 519
 520 /**
 521  * rs_get_supported_rates - get the available rates
 522  *
 523  * if management frame or broadcast frame only return
 524  * basic available rates.
 525  *
 526  */
 527 static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
 528                                    struct ieee80211_hdr *hdr,
 529                                    enum iwl4965_table_type rate_type,
 530                                    u16 *data_rate)
 531 {
 532         if (is_legacy(rate_type))
 533                 *data_rate = lq_sta->active_rate;
 534         else {
 535                 if (is_siso(rate_type))
 536                         *data_rate = lq_sta->active_siso_rate;
 537                 else
 538                         *data_rate = lq_sta->active_mimo_rate;
 539         }
 540
 541         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 542             lq_sta->active_rate_basic) {
 543                 *data_rate = lq_sta->active_rate_basic;
 544         }
 545 }
 546
 547 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 548 {
 549         u8 high = IWL_RATE_INVALID;
 550         u8 low = IWL_RATE_INVALID;
 551
 552         /* 802.11A or ht walks to the next literal adjacent rate in
 553          * the rate table */
 554         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 555                 int i;
 556                 u32 mask;
 557
 558                 /* Find the previous rate that is in the rate mask */
 559                 i = index - 1;
 560                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 561                         if (rate_mask & mask) {
 562                                 low = i;
 563                                 break;
 564                         }
 565                 }
 566
 567                 /* Find the next rate that is in the rate mask */
 568                 i = index + 1;
 569                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 570                         if (rate_mask & mask) {
 571                                 high = i;
 572                                 break;
 573                         }
 574                 }
 575
 576                 return (high << 8) | low;
 577         }
 578
 579         low = index;
 580         while (low != IWL_RATE_INVALID) {
 581                 low = iwl4965_rates[low].prev_rs;
 582                 if (low == IWL_RATE_INVALID)
 583                         break;
 584                 if (rate_mask & (1 << low))
 585                         break;
 586                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 587         }
 588
 589         high = index;
 590         while (high != IWL_RATE_INVALID) {
 591                 high = iwl4965_rates[high].next_rs;
 592                 if (high == IWL_RATE_INVALID)
 593                         break;
 594                 if (rate_mask & (1 << high))
 595                         break;
 596                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 597         }
 598
 599         return (high << 8) | low;
 600 }
 601
 602 static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
 603                              struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
 604                              u8 ht_possible, struct iwl4965_rate *mcs_rate)
 605 {
 606         s32 low;
 607         u16 rate_mask;
 608         u16 high_low;
 609         u8 switch_to_legacy = 0;
 610         u8 is_green = lq_sta->is_green;
 611
 612         /* check if we need to switch from HT to legacy rates.
 613          * assumption is that mandatory rates (1Mbps or 6Mbps)
 614          * are always supported (spec demand) */
 615         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 616                 switch_to_legacy = 1;
 617                 scale_index = rs_ht_to_legacy[scale_index];
 618                 if (lq_sta->phymode == MODE_IEEE80211A)
 619                         tbl->lq_type = LQ_A;
 620                 else
 621                         tbl->lq_type = LQ_G;
 622
 623                 if ((tbl->antenna_type == ANT_BOTH) ||
 624                     (tbl->antenna_type == ANT_NONE))
 625                         tbl->antenna_type = ANT_MAIN;
 626
 627                 tbl->is_fat = 0;
 628                 tbl->is_SGI = 0;
 629         }
 630
 631         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
 632
 633         /* Mask with station rate restriction */
 634         if (is_legacy(tbl->lq_type)) {
 635                 /* supp_rates has no CCK bits in A mode */
 636                 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
 637                         rate_mask  = (u16)(rate_mask &
 638                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 639                 else
 640                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 641         }
 642
 643         /* If we switched from HT to legacy, check current rate */
 644         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 645                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 646                 return;
 647         }
 648
 649         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 650         low = high_low & 0xff;
 651
 652         if (low != IWL_RATE_INVALID)
 653                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 654         else
 655                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 656 }
 657
 658 /*
 659  * mac80211 sends us Tx status
 660  */
 661 static void rs_tx_status(void *priv_rate, struct net_device *dev,
 662                          struct sk_buff *skb,
 663                          struct ieee80211_tx_status *tx_resp)
 664 {
 665         int status;
 666         u8 retries;
 667         int rs_index, index = 0;
 668         struct iwl4965_lq_sta *lq_sta;
 669         struct iwl4965_link_quality_cmd *table;
 670         struct sta_info *sta;
 671         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 672         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
 673         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 674         struct iwl4965_rate_scale_data *window = NULL;
 675         struct iwl4965_rate_scale_data *search_win = NULL;
 676         struct iwl4965_rate tx_mcs;
 677         struct iwl4965_scale_tbl_info tbl_type;
 678         struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
 679         u8 active_index = 0;
 680         u16 fc = le16_to_cpu(hdr->frame_control);
 681         s32 tpt = 0;
 682
 683         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 684
 685         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 686                 return;
 687
 688         /* This packet was aggregated but doesn't carry rate scale info */
 689         if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
 690             !(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
 691                 return;
 692
 693         retries = tx_resp->retry_count;
 694
 695         if (retries > 15)
 696                 retries = 15;
 697
 698
 699         sta = sta_info_get(local, hdr->addr1);
 700
 701         if (!sta || !sta->rate_ctrl_priv) {
 702                 if (sta)
 703                         sta_info_put(sta);
 704                 return;
 705         }
 706
 707         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
 708
 709         if (!priv->lq_mngr.lq_ready)
 710                 return;
 711
 712         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
 713             !lq_sta->ibss_sta_added)
 714                 return;
 715
 716         table = &lq_sta->lq;
 717         active_index = lq_sta->active_tbl;
 718
 719         /* Get mac80211 antenna info */
 720         lq_sta->antenna =
 721                 (lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
 722         if (!lq_sta->antenna)
 723                 lq_sta->antenna = lq_sta->valid_antenna;
 724
 725         /* Ignore mac80211 antenna info for now */
 726         lq_sta->antenna = lq_sta->valid_antenna;
 727
 728         curr_tbl = &(lq_sta->lq_info[active_index]);
 729         search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
 730         window = (struct iwl4965_rate_scale_data *)
 731             &(curr_tbl->win[0]);
 732         search_win = (struct iwl4965_rate_scale_data *)
 733             &(search_tbl->win[0]);
 734
 735         tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 736
 737         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 738                                   &tbl_type, &rs_index);
 739         if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
 740                 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
 741                              rs_index, tx_mcs.rate_n_flags);
 742                 sta_info_put(sta);
 743                 return;
 744         }
 745
 746         /*
 747          * Ignore this Tx frame response if its initial rate doesn't match
 748          * that of latest Link Quality command.  There may be stragglers
 749          * from a previous Link Quality command, but we're no longer interested
 750          * in those; they're either from the "active" mode while we're trying
 751          * to check "search" mode, or a prior "search" mode after we've moved
 752          * to a new "search" mode (which might become the new "active" mode).
 753          */
 754         if (retries &&
 755             (tx_mcs.rate_n_flags !=
 756                                 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
 757                 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
 758                                 tx_mcs.rate_n_flags,
 759                                 le32_to_cpu(table->rs_table[0].rate_n_flags));
 760                 sta_info_put(sta);
 761                 return;
 762         }
 763
 764         /* Update frame history window with "failure" for each Tx retry. */
 765         while (retries) {
 766                 /* Look up the rate and other info used for each tx attempt.
 767                  * Each tx attempt steps one entry deeper in the rate table. */
 768                 tx_mcs.rate_n_flags =
 769                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 770                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 771                                           &tbl_type, &rs_index);
 772
 773                 /* If type matches "search" table,
 774                  * add failure to "search" history */
 775                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 776                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
 777                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 778                         if (search_tbl->expected_tpt)
 779                                 tpt = search_tbl->expected_tpt[rs_index];
 780                         else
 781                                 tpt = 0;
 782                         rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
 783
 784                 /* Else if type matches "current/active" table,
 785                  * add failure to "current/active" history */
 786                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 787                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 788                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 789                         if (curr_tbl->expected_tpt)
 790                                 tpt = curr_tbl->expected_tpt[rs_index];
 791                         else
 792                                 tpt = 0;
 793                         rs_collect_tx_data(window, rs_index, tpt, 1, 0);
 794                 }
 795
 796                 /* If not searching for a new mode, increment failed counter
 797                  * ... this helps determine when to start searching again */
 798                 if (lq_sta->stay_in_tbl)
 799                         lq_sta->total_failed++;
 800                 --retries;
 801                 index++;
 802
 803         }
 804
 805         /*
 806          * Find (by rate) the history window to update with final Tx attempt;
 807          * if Tx was successful first try, use original rate,
 808          * else look up the rate that was, finally, successful.
 809          */
 810         if (!tx_resp->retry_count)
 811                 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 812         else
 813                 tx_mcs.rate_n_flags =
 814                         le32_to_cpu(table->rs_table[index].rate_n_flags);
 815
 816         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 817                                   &tbl_type, &rs_index);
 818
 819         /* Update frame history window with "success" if Tx got ACKed ... */
 820         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 821                 status = 1;
 822         else
 823                 status = 0;
 824
 825         /* If type matches "search" table,
 826          * add final tx status to "search" history */
 827         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 828             (tbl_type.antenna_type == search_tbl->antenna_type) &&
 829             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 830                 if (search_tbl->expected_tpt)
 831                         tpt = search_tbl->expected_tpt[rs_index];
 832                 else
 833                         tpt = 0;
 834                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 835                         rs_collect_tx_data(search_win, rs_index, tpt,
 836                                            tx_resp->ampdu_ack_len,
 837                                            tx_resp->ampdu_ack_map);
 838                 else
 839                         rs_collect_tx_data(search_win, rs_index, tpt,
 840                                            1, status);
 841         /* Else if type matches "current/active" table,
 842          * add final tx status to "current/active" history */
 843         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 844                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 845                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 846                 if (curr_tbl->expected_tpt)
 847                         tpt = curr_tbl->expected_tpt[rs_index];
 848                 else
 849                         tpt = 0;
 850                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
 851                         rs_collect_tx_data(window, rs_index, tpt,
 852                                            tx_resp->ampdu_ack_len,
 853                                            tx_resp->ampdu_ack_map);
 854                 else
 855                         rs_collect_tx_data(window, rs_index, tpt,
 856                                            1, status);
 857         }
 858
 859         /* If not searching for new mode, increment success/failed counter
 860          * ... these help determine when to start searching again */
 861         if (lq_sta->stay_in_tbl) {
 862                 if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
 863                         lq_sta->total_success += tx_resp->ampdu_ack_map;
 864                         lq_sta->total_failed +=
 865                              (tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
 866                 } else {
 867                         if (status)
 868                                 lq_sta->total_success++;
 869                         else
 870                                 lq_sta->total_failed++;
 871                 }
 872         }
 873
 874         /* See if there's a better rate or modulation mode to try. */
 875         rs_rate_scale_perform(priv, dev, hdr, sta);
 876         sta_info_put(sta);
 877         return;
 878 }
 879
 880 static u8 rs_is_ant_connected(u8 valid_antenna,
 881                               enum iwl4965_antenna_type antenna_type)
 882 {
 883         if (antenna_type == ANT_AUX)
 884                 return ((valid_antenna & 0x2) ? 1:0);
 885         else if (antenna_type == ANT_MAIN)
 886                 return ((valid_antenna & 0x1) ? 1:0);
 887         else if (antenna_type == ANT_BOTH)
 888                 return ((valid_antenna & 0x3) == 0x3);
 889
 890         return 1;
 891 }
 892
 893 static u8 rs_is_other_ant_connected(u8 valid_antenna,
 894                                     enum iwl4965_antenna_type antenna_type)
 895 {
 896         if (antenna_type == ANT_AUX)
 897                 return rs_is_ant_connected(valid_antenna, ANT_MAIN);
 898         else
 899                 return rs_is_ant_connected(valid_antenna, ANT_AUX);
 900
 901         return 0;
 902 }
 903
 904 /*
 905  * Begin a period of staying with a selected modulation mode.
 906  * Set "stay_in_tbl" flag to prevent any mode switches.
 907  * Set frame tx success limits according to legacy vs. high-throughput,
 908  * and reset overall (spanning all rates) tx success history statistics.
 909  * These control how long we stay using same modulation mode before
 910  * searching for a new mode.
 911  */
 912 static void rs_set_stay_in_table(u8 is_legacy,
 913                                  struct iwl4965_lq_sta *lq_sta)
 914 {
 915         IWL_DEBUG_HT("we are staying in the same table\n");
 916         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 917         if (is_legacy) {
 918                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 919                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 920                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 921         } else {
 922                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 923                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 924                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 925         }
 926         lq_sta->table_count = 0;
 927         lq_sta->total_failed = 0;
 928         lq_sta->total_success = 0;
 929 }
 930
 931 /*
 932  * Find correct throughput table for given mode of modulation
 933  */
 934 static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
 935                                       struct iwl4965_scale_tbl_info *tbl)
 936 {
 937         if (is_legacy(tbl->lq_type)) {
 938                 if (!is_a_band(tbl->lq_type))
 939                         tbl->expected_tpt = expected_tpt_G;
 940                 else
 941                         tbl->expected_tpt = expected_tpt_A;
 942         } else if (is_siso(tbl->lq_type)) {
 943                 if (tbl->is_fat && !lq_sta->is_dup)
 944                         if (tbl->is_SGI)
 945                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 946                         else
 947                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 948                 else if (tbl->is_SGI)
 949                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
 950                 else
 951                         tbl->expected_tpt = expected_tpt_siso20MHz;
 952
 953         } else if (is_mimo(tbl->lq_type)) {
 954                 if (tbl->is_fat && !lq_sta->is_dup)
 955                         if (tbl->is_SGI)
 956                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
 957                         else
 958                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
 959                 else if (tbl->is_SGI)
 960                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
 961                 else
 962                         tbl->expected_tpt = expected_tpt_mimo20MHz;
 963         } else
 964                 tbl->expected_tpt = expected_tpt_G;
 965 }
 966
 967 #ifdef CONFIG_IWL4965_HT
 968 /*
 969  * Find starting rate for new "search" high-throughput mode of modulation.
 970  * Goal is to find lowest expected rate (under perfect conditions) that is
 971  * above the current measured throughput of "active" mode, to give new mode
 972  * a fair chance to prove itself without too many challenges.
 973  *
 974  * This gets called when transitioning to more aggressive modulation
 975  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
 976  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
 977  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
 978  * bit rate will typically need to increase, but not if performance was bad.
 979  */
 980 static s32 rs_get_best_rate(struct iwl4965_priv *priv,
 981                             struct iwl4965_lq_sta *lq_sta,
 982                             struct iwl4965_scale_tbl_info *tbl, /* "search" */
 983                             u16 rate_mask, s8 index, s8 rate)
 984 {
 985         /* "active" values */
 986         struct iwl4965_scale_tbl_info *active_tbl =
 987             &(lq_sta->lq_info[lq_sta->active_tbl]);
 988         s32 active_sr = active_tbl->win[index].success_ratio;
 989         s32 active_tpt = active_tbl->expected_tpt[index];
 990
 991         /* expected "search" throughput */
 992         s32 *tpt_tbl = tbl->expected_tpt;
 993
 994         s32 new_rate, high, low, start_hi;
 995         u16 high_low;
 996
 997         new_rate = high = low = start_hi = IWL_RATE_INVALID;
 998
 999         for (; ;) {
1000                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
1001
1002                 low = high_low & 0xff;
1003                 high = (high_low >> 8) & 0xff;
1004
1005                 /*
1006                  * Lower the "search" bit rate, to give new "search" mode
1007                  * approximately the same throughput as "active" if:
1008                  *
1009                  * 1) "Active" mode has been working modestly well (but not
1010                  *    great), and expected "search" throughput (under perfect
1011                  *    conditions) at candidate rate is above the actual
1012                  *    measured "active" throughput (but less than expected
1013                  *    "active" throughput under perfect conditions).
1014                  * OR
1015                  * 2) "Active" mode has been working perfectly or very well
1016                  *    and expected "search" throughput (under perfect
1017                  *    conditions) at candidate rate is above expected
1018                  *    "active" throughput (under perfect conditions).
1019                  */
1020                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1021                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1022                       (active_sr <= IWL_RATE_HIGH_TH) &&
1023                       (tpt_tbl[rate] <= active_tpt))) ||
1024                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1025                      (tpt_tbl[rate] > active_tpt))) {
1026
1027                         /* (2nd or later pass)
1028                          * If we've already tried to raise the rate, and are
1029                          * now trying to lower it, use the higher rate. */
1030                         if (start_hi != IWL_RATE_INVALID) {
1031                                 new_rate = start_hi;
1032                                 break;
1033                         }
1034
1035                         new_rate = rate;
1036
1037                         /* Loop again with lower rate */
1038                         if (low != IWL_RATE_INVALID)
1039                                 rate = low;
1040
1041                         /* Lower rate not available, use the original */
1042                         else
1043                                 break;
1044
1045                 /* Else try to raise the "search" rate to match "active" */
1046                 } else {
1047                         /* (2nd or later pass)
1048                          * If we've already tried to lower the rate, and are
1049                          * now trying to raise it, use the lower rate. */
1050                         if (new_rate != IWL_RATE_INVALID)
1051                                 break;
1052
1053                         /* Loop again with higher rate */
1054                         else if (high != IWL_RATE_INVALID) {
1055                                 start_hi = high;
1056                                 rate = high;
1057
1058                         /* Higher rate not available, use the original */
1059                         } else {
1060                                 new_rate = rate;
1061                                 break;
1062                         }
1063                 }
1064         }
1065
1066         return new_rate;
1067 }
1068 #endif                          /* CONFIG_IWL4965_HT */
1069
1070 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
1071 {
1072         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
1073 }
1074
1075 /*
1076  * Set up search table for MIMO
1077  */
1078 static int rs_switch_to_mimo(struct iwl4965_priv *priv,
1079                              struct iwl4965_lq_sta *lq_sta,
1080                              struct ieee80211_conf *conf,
1081                              struct sta_info *sta,
1082                              struct iwl4965_scale_tbl_info *tbl, int index)
1083 {
1084 #ifdef CONFIG_IWL4965_HT
1085         u16 rate_mask;
1086         s32 rate;
1087         s8 is_green = lq_sta->is_green;
1088
1089         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1090             !sta->ht_info.ht_supported)
1091                 return -1;
1092
1093         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
1094         tbl->lq_type = LQ_MIMO;
1095         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1096                                 &rate_mask);
1097
1098         if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1099                 return -1;
1100
1101         /* Need both Tx chains/antennas to support MIMO */
1102         if (!rs_is_both_ant_supp(lq_sta->antenna))
1103                 return -1;
1104
1105         tbl->is_dup = lq_sta->is_dup;
1106         tbl->action = 0;
1107         if (priv->current_ht_config.supported_chan_width
1108             == IWL_CHANNEL_WIDTH_40MHZ)
1109                 tbl->is_fat = 1;
1110         else
1111                 tbl->is_fat = 0;
1112
1113         if (tbl->is_fat) {
1114                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1115                         tbl->is_SGI = 1;
1116                 else
1117                         tbl->is_SGI = 0;
1118         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1119                 tbl->is_SGI = 1;
1120         else
1121                 tbl->is_SGI = 0;
1122
1123         rs_get_expected_tpt_table(lq_sta, tbl);
1124
1125         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1126
1127         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
1128         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
1129                 return -1;
1130         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1131
1132         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1133                      tbl->current_rate.rate_n_flags, is_green);
1134         return 0;
1135 #else
1136         return -1;
1137 #endif                          /*CONFIG_IWL4965_HT */
1138 }
1139
1140 /*
1141  * Set up search table for SISO
1142  */
1143 static int rs_switch_to_siso(struct iwl4965_priv *priv,
1144                              struct iwl4965_lq_sta *lq_sta,
1145                              struct ieee80211_conf *conf,
1146                              struct sta_info *sta,
1147                              struct iwl4965_scale_tbl_info *tbl, int index)
1148 {
1149 #ifdef CONFIG_IWL4965_HT
1150         u16 rate_mask;
1151         u8 is_green = lq_sta->is_green;
1152         s32 rate;
1153
1154         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
1155         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1156             !sta->ht_info.ht_supported)
1157                 return -1;
1158
1159         tbl->is_dup = lq_sta->is_dup;
1160         tbl->lq_type = LQ_SISO;
1161         tbl->action = 0;
1162         rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
1163                                 &rate_mask);
1164
1165         if (priv->current_ht_config.supported_chan_width
1166             == IWL_CHANNEL_WIDTH_40MHZ)
1167                 tbl->is_fat = 1;
1168         else
1169                 tbl->is_fat = 0;
1170
1171         if (tbl->is_fat) {
1172                 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1173                         tbl->is_SGI = 1;
1174                 else
1175                         tbl->is_SGI = 0;
1176         } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1177                 tbl->is_SGI = 1;
1178         else
1179                 tbl->is_SGI = 0;
1180
1181         if (is_green)
1182                 tbl->is_SGI = 0;
1183
1184         rs_get_expected_tpt_table(lq_sta, tbl);
1185         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
1186
1187         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1188         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1189                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1190                              rate, rate_mask);
1191                 return -1;
1192         }
1193         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1194         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1195                      tbl->current_rate.rate_n_flags, is_green);
1196         return 0;
1197 #else
1198         return -1;
1199
1200 #endif                          /*CONFIG_IWL4965_HT */
1201 }
1202
1203 /*
1204  * Try to switch to new modulation mode from legacy
1205  */
1206 static int rs_move_legacy_other(struct iwl4965_priv *priv,
1207                                 struct iwl4965_lq_sta *lq_sta,
1208                                 struct ieee80211_conf *conf,
1209                                 struct sta_info *sta,
1210                                 int index)
1211 {
1212         int ret = 0;
1213         struct iwl4965_scale_tbl_info *tbl =
1214             &(lq_sta->lq_info[lq_sta->active_tbl]);
1215         struct iwl4965_scale_tbl_info *search_tbl =
1216             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1217         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1218         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1219                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1220         u8 start_action = tbl->action;
1221
1222         for (; ;) {
1223                 switch (tbl->action) {
1224                 case IWL_LEGACY_SWITCH_ANTENNA:
1225                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1226
1227                         search_tbl->lq_type = LQ_NONE;
1228                         lq_sta->action_counter++;
1229
1230                         /* Don't change antenna if success has been great */
1231                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1232                                 break;
1233
1234                         /* Don't change antenna if other one is not connected */
1235                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1236                                                         tbl->antenna_type))
1237                                 break;
1238
1239                         /* Set up search table to try other antenna */
1240                         memcpy(search_tbl, tbl, sz);
1241
1242                         rs_toggle_antenna(&(search_tbl->current_rate),
1243                                            search_tbl);
1244                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1245                         lq_sta->search_better_tbl = 1;
1246                         goto out;
1247
1248                 case IWL_LEGACY_SWITCH_SISO:
1249                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1250
1251                         /* Set up search table to try SISO */
1252                         memcpy(search_tbl, tbl, sz);
1253                         search_tbl->lq_type = LQ_SISO;
1254                         search_tbl->is_SGI = 0;
1255                         search_tbl->is_fat = 0;
1256                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1257                                                  search_tbl, index);
1258                         if (!ret) {
1259                                 lq_sta->search_better_tbl = 1;
1260                                 lq_sta->action_counter = 0;
1261                                 goto out;
1262                         }
1263
1264                         break;
1265                 case IWL_LEGACY_SWITCH_MIMO:
1266                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1267
1268                         /* Set up search table to try MIMO */
1269                         memcpy(search_tbl, tbl, sz);
1270                         search_tbl->lq_type = LQ_MIMO;
1271                         search_tbl->is_SGI = 0;
1272                         search_tbl->is_fat = 0;
1273                         search_tbl->antenna_type = ANT_BOTH;
1274                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1275                                                  search_tbl, index);
1276                         if (!ret) {
1277                                 lq_sta->search_better_tbl = 1;
1278                                 lq_sta->action_counter = 0;
1279                                 goto out;
1280                         }
1281                         break;
1282                 }
1283                 tbl->action++;
1284                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1285                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1286
1287                 if (tbl->action == start_action)
1288                         break;
1289
1290         }
1291         return 0;
1292
1293  out:
1294         tbl->action++;
1295         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1296                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1297         return 0;
1298
1299 }
1300
1301 /*
1302  * Try to switch to new modulation mode from SISO
1303  */
1304 static int rs_move_siso_to_other(struct iwl4965_priv *priv,
1305                                  struct iwl4965_lq_sta *lq_sta,
1306                                  struct ieee80211_conf *conf,
1307                                  struct sta_info *sta,
1308                                  int index)
1309 {
1310         int ret;
1311         u8 is_green = lq_sta->is_green;
1312         struct iwl4965_scale_tbl_info *tbl =
1313             &(lq_sta->lq_info[lq_sta->active_tbl]);
1314         struct iwl4965_scale_tbl_info *search_tbl =
1315             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1316         struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1317         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1318                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1319         u8 start_action = tbl->action;
1320
1321         for (;;) {
1322                 lq_sta->action_counter++;
1323                 switch (tbl->action) {
1324                 case IWL_SISO_SWITCH_ANTENNA:
1325                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1326                         search_tbl->lq_type = LQ_NONE;
1327                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1328                                 break;
1329                         if (!rs_is_other_ant_connected(lq_sta->antenna,
1330                                                        tbl->antenna_type))
1331                                 break;
1332
1333                         memcpy(search_tbl, tbl, sz);
1334                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1335                         rs_toggle_antenna(&(search_tbl->current_rate),
1336                                            search_tbl);
1337                         lq_sta->search_better_tbl = 1;
1338
1339                         goto out;
1340
1341                 case IWL_SISO_SWITCH_MIMO:
1342                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1343                         memcpy(search_tbl, tbl, sz);
1344                         search_tbl->lq_type = LQ_MIMO;
1345                         search_tbl->is_SGI = 0;
1346                         search_tbl->is_fat = 0;
1347                         search_tbl->antenna_type = ANT_BOTH;
1348                         ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
1349                                                  search_tbl, index);
1350                         if (!ret) {
1351                                 lq_sta->search_better_tbl = 1;
1352                                 goto out;
1353                         }
1354                         break;
1355                 case IWL_SISO_SWITCH_GI:
1356                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1357                         memcpy(search_tbl, tbl, sz);
1358                         search_tbl->action = 0;
1359                         if (search_tbl->is_SGI)
1360                                 search_tbl->is_SGI = 0;
1361                         else if (!is_green)
1362                                 search_tbl->is_SGI = 1;
1363                         else
1364                                 break;
1365                         lq_sta->search_better_tbl = 1;
1366                         if ((tbl->lq_type == LQ_SISO) &&
1367                             (tbl->is_SGI)) {
1368                                 s32 tpt = lq_sta->last_tpt / 100;
1369                                 if (((!tbl->is_fat) &&
1370                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1371                                     ((tbl->is_fat) &&
1372                                      (tpt >= expected_tpt_siso40MHz[index])))
1373                                         lq_sta->search_better_tbl = 0;
1374                         }
1375                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1376                         rs_mcs_from_tbl(&search_tbl->current_rate,
1377                                              search_tbl, index, is_green);
1378                         goto out;
1379                 }
1380                 tbl->action++;
1381                 if (tbl->action > IWL_SISO_SWITCH_GI)
1382                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1383
1384                 if (tbl->action == start_action)
1385                         break;
1386         }
1387         return 0;
1388
1389  out:
1390         tbl->action++;
1391         if (tbl->action > IWL_SISO_SWITCH_GI)
1392                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1393         return 0;
1394 }
1395
1396 /*
1397  * Try to switch to new modulation mode from MIMO
1398  */
1399 static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
1400                                  struct iwl4965_lq_sta *lq_sta,
1401                                  struct ieee80211_conf *conf,
1402                                  struct sta_info *sta,
1403                                  int index)
1404 {
1405         int ret;
1406         s8 is_green = lq_sta->is_green;
1407         struct iwl4965_scale_tbl_info *tbl =
1408             &(lq_sta->lq_info[lq_sta->active_tbl]);
1409         struct iwl4965_scale_tbl_info *search_tbl =
1410             &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1411         u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1412                   (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1413         u8 start_action = tbl->action;
1414
1415         for (;;) {
1416                 lq_sta->action_counter++;
1417                 switch (tbl->action) {
1418                 case IWL_MIMO_SWITCH_ANTENNA_A:
1419                 case IWL_MIMO_SWITCH_ANTENNA_B:
1420                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1421
1422                         /* Set up new search table for SISO */
1423                         memcpy(search_tbl, tbl, sz);
1424                         search_tbl->lq_type = LQ_SISO;
1425                         search_tbl->is_SGI = 0;
1426                         search_tbl->is_fat = 0;
1427                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1428                                 search_tbl->antenna_type = ANT_MAIN;
1429                         else
1430                                 search_tbl->antenna_type = ANT_AUX;
1431
1432                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1433                                                  search_tbl, index);
1434                         if (!ret) {
1435                                 lq_sta->search_better_tbl = 1;
1436                                 goto out;
1437                         }
1438                         break;
1439
1440                 case IWL_MIMO_SWITCH_GI:
1441                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1442
1443                         /* Set up new search table for MIMO */
1444                         memcpy(search_tbl, tbl, sz);
1445                         search_tbl->lq_type = LQ_MIMO;
1446                         search_tbl->antenna_type = ANT_BOTH;
1447                         search_tbl->action = 0;
1448                         if (search_tbl->is_SGI)
1449                                 search_tbl->is_SGI = 0;
1450                         else
1451                                 search_tbl->is_SGI = 1;
1452                         lq_sta->search_better_tbl = 1;
1453
1454                         /*
1455                          * If active table already uses the fastest possible
1456                          * modulation (dual stream with short guard interval),
1457                          * and it's working well, there's no need to look
1458                          * for a better type of modulation!
1459                          */
1460                         if ((tbl->lq_type == LQ_MIMO) &&
1461                             (tbl->is_SGI)) {
1462                                 s32 tpt = lq_sta->last_tpt / 100;
1463                                 if (((!tbl->is_fat) &&
1464                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1465                                     ((tbl->is_fat) &&
1466                                      (tpt >= expected_tpt_mimo40MHz[index])))
1467                                         lq_sta->search_better_tbl = 0;
1468                         }
1469                         rs_get_expected_tpt_table(lq_sta, search_tbl);
1470                         rs_mcs_from_tbl(&search_tbl->current_rate,
1471                                              search_tbl, index, is_green);
1472                         goto out;
1473
1474                 }
1475                 tbl->action++;
1476                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1477                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1478
1479                 if (tbl->action == start_action)
1480                         break;
1481         }
1482
1483         return 0;
1484  out:
1485         tbl->action++;
1486         if (tbl->action > IWL_MIMO_SWITCH_GI)
1487                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1488         return 0;
1489
1490 }
1491
1492 /*
1493  * Check whether we should continue using same modulation mode, or
1494  * begin search for a new mode, based on:
1495  * 1) # tx successes or failures while using this mode
1496  * 2) # times calling this function
1497  * 3) elapsed time in this mode (not used, for now)
1498  */
1499 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1500 {
1501         struct iwl4965_scale_tbl_info *tbl;
1502         int i;
1503         int active_tbl;
1504         int flush_interval_passed = 0;
1505
1506         active_tbl = lq_sta->active_tbl;
1507
1508         tbl = &(lq_sta->lq_info[active_tbl]);
1509
1510         /* If we've been disallowing search, see if we should now allow it */
1511         if (lq_sta->stay_in_tbl) {
1512
1513                 /* Elapsed time using current modulation mode */
1514                 if (lq_sta->flush_timer)
1515                         flush_interval_passed =
1516                             time_after(jiffies,
1517                                        (unsigned long)(lq_sta->flush_timer +
1518                                         IWL_RATE_SCALE_FLUSH_INTVL));
1519
1520                 /* For now, disable the elapsed time criterion */
1521                 flush_interval_passed = 0;
1522
1523                 /*
1524                  * Check if we should allow search for new modulation mode.
1525                  * If many frames have failed or succeeded, or we've used
1526                  * this same modulation for a long time, allow search, and
1527                  * reset history stats that keep track of whether we should
1528                  * allow a new search.  Also (below) reset all bitmaps and
1529                  * stats in active history.
1530                  */
1531                 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1532                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1533                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1534                      && (flush_interval_passed))) {
1535                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1536                                      lq_sta->total_failed,
1537                                      lq_sta->total_success,
1538                                      flush_interval_passed);
1539
1540                         /* Allow search for new mode */
1541                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1542                         lq_sta->total_failed = 0;
1543                         lq_sta->total_success = 0;
1544                         lq_sta->flush_timer = 0;
1545
1546                 /*
1547                  * Else if we've used this modulation mode enough repetitions
1548                  * (regardless of elapsed time or success/failure), reset
1549                  * history bitmaps and rate-specific stats for all rates in
1550                  * active table.
1551                  */
1552                 } else {
1553                         lq_sta->table_count++;
1554                         if (lq_sta->table_count >=
1555                             lq_sta->table_count_limit) {
1556                                 lq_sta->table_count = 0;
1557
1558                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1559                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1560                                         rs_rate_scale_clear_window(
1561                                                 &(tbl->win[i]));
1562                         }
1563                 }
1564
1565                 /* If transitioning to allow "search", reset all history
1566                  * bitmaps and stats in active table (this will become the new
1567                  * "search" table). */
1568                 if (!lq_sta->stay_in_tbl) {
1569                         for (i = 0; i < IWL_RATE_COUNT; i++)
1570                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1571                 }
1572         }
1573 }
1574
1575 /*
1576  * Do rate scaling and search for new modulation mode.
1577  */
1578 static void rs_rate_scale_perform(struct iwl4965_priv *priv,
1579                                   struct net_device *dev,
1580                                   struct ieee80211_hdr *hdr,
1581                                   struct sta_info *sta)
1582 {
1583         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1584         struct ieee80211_hw *hw = local_to_hw(local);
1585         struct ieee80211_conf *conf = &hw->conf;
1586         int low = IWL_RATE_INVALID;
1587         int high = IWL_RATE_INVALID;
1588         int index;
1589         int i;
1590         struct iwl4965_rate_scale_data *window = NULL;
1591         int current_tpt = IWL_INVALID_VALUE;
1592         int low_tpt = IWL_INVALID_VALUE;
1593         int high_tpt = IWL_INVALID_VALUE;
1594         u32 fail_count;
1595         s8 scale_action = 0;
1596         u16 fc, rate_mask;
1597         u8 update_lq = 0;
1598         struct iwl4965_lq_sta *lq_sta;
1599         struct iwl4965_scale_tbl_info *tbl, *tbl1;
1600         u16 rate_scale_index_msk = 0;
1601         struct iwl4965_rate mcs_rate;
1602         u8 is_green = 0;
1603         u8 active_tbl = 0;
1604         u8 done_search = 0;
1605         u16 high_low;
1606
1607         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1608
1609         fc = le16_to_cpu(hdr->frame_control);
1610         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1611                 /* Send management frames and broadcast/multicast data using
1612                  * lowest rate. */
1613                 /* TODO: this could probably be improved.. */
1614                 return;
1615         }
1616
1617         if (!sta || !sta->rate_ctrl_priv)
1618                 return;
1619
1620         if (!priv->lq_mngr.lq_ready) {
1621                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1622                 return;
1623         }
1624         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1625
1626         /*
1627          * Select rate-scale / modulation-mode table to work with in
1628          * the rest of this function:  "search" if searching for better
1629          * modulation mode, or "active" if doing rate scaling within a mode.
1630          */
1631         if (!lq_sta->search_better_tbl)
1632                 active_tbl = lq_sta->active_tbl;
1633         else
1634                 active_tbl = 1 - lq_sta->active_tbl;
1635
1636         tbl = &(lq_sta->lq_info[active_tbl]);
1637         is_green = lq_sta->is_green;
1638
1639         /* current tx rate */
1640         index = sta->last_txrate;
1641
1642         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1643                        tbl->lq_type);
1644
1645         /* rates available for this association, and for modulation mode */
1646         rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
1647                                 &rate_mask);
1648
1649         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1650
1651         /* mask with station rate restriction */
1652         if (is_legacy(tbl->lq_type)) {
1653                 if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1654                         /* supp_rates has no CCK bits in A mode */
1655                         rate_scale_index_msk = (u16) (rate_mask &
1656                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1657                 else
1658                         rate_scale_index_msk = (u16) (rate_mask &
1659                                                       lq_sta->supp_rates);
1660
1661         } else
1662                 rate_scale_index_msk = rate_mask;
1663
1664         if (!rate_scale_index_msk)
1665                 rate_scale_index_msk = rate_mask;
1666
1667         /* If current rate is no longer supported on current association,
1668          * or user changed preferences for rates, find a new supported rate. */
1669         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1670                 index = IWL_INVALID_VALUE;
1671                 update_lq = 1;
1672
1673                 /* get the highest available rate */
1674                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1675                         if ((1 << i) & rate_scale_index_msk)
1676                                 index = i;
1677                 }
1678
1679                 if (index == IWL_INVALID_VALUE) {
1680                         IWL_WARNING("Can not find a suitable rate\n");
1681                         return;
1682                 }
1683         }
1684
1685         /* Get expected throughput table and history window for current rate */
1686         if (!tbl->expected_tpt)
1687                 rs_get_expected_tpt_table(lq_sta, tbl);
1688
1689         window = &(tbl->win[index]);
1690
1691         /*
1692          * If there is not enough history to calculate actual average
1693          * throughput, keep analyzing results of more tx frames, without
1694          * changing rate or mode (bypass most of the rest of this function).
1695          * Set up new rate table in uCode only if old rate is not supported
1696          * in current association (use new rate found above).
1697          */
1698         fail_count = window->counter - window->success_counter;
1699         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1700              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1701             || (tbl->expected_tpt == NULL)) {
1702                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1703                                "for index %d\n",
1704                                window->success_counter, window->counter, index);
1705
1706                 /* Can't calculate this yet; not enough history */
1707                 window->average_tpt = IWL_INVALID_VALUE;
1708
1709                 /* Should we stay with this modulation mode,
1710                  * or search for a new one? */
1711                 rs_stay_in_table(lq_sta);
1712
1713                 /* Set up new rate table in uCode, if needed */
1714                 if (update_lq) {
1715                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1716                         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1717                         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1718                 }
1719                 goto out;
1720
1721         /* Else we have enough samples; calculate estimate of
1722          * actual average throughput */
1723         } else
1724                 window->average_tpt = ((window->success_ratio *
1725                                         tbl->expected_tpt[index] + 64) / 128);
1726
1727         /* If we are searching for better modulation mode, check success. */
1728         if (lq_sta->search_better_tbl) {
1729                 int success_limit = IWL_RATE_SCALE_SWITCH;
1730
1731                 /* If good success, continue using the "search" mode;
1732                  * no need to send new link quality command, since we're
1733                  * continuing to use the setup that we've been trying. */
1734                 if ((window->success_ratio > success_limit) ||
1735                     (window->average_tpt > lq_sta->last_tpt)) {
1736                         if (!is_legacy(tbl->lq_type)) {
1737                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1738                                              " rate suc %d current tpt %d"
1739                                              " old tpt %d\n",
1740                                              window->success_ratio,
1741                                              window->average_tpt,
1742                                              lq_sta->last_tpt);
1743                                 lq_sta->enable_counter = 1;
1744                         }
1745                         /* Swap tables; "search" becomes "active" */
1746                         lq_sta->active_tbl = active_tbl;
1747                         current_tpt = window->average_tpt;
1748
1749                 /* Else poor success; go back to mode in "active" table */
1750                 } else {
1751                         /* Nullify "search" table */
1752                         tbl->lq_type = LQ_NONE;
1753
1754                         /* Revert to "active" table */
1755                         active_tbl = lq_sta->active_tbl;
1756                         tbl = &(lq_sta->lq_info[active_tbl]);
1757
1758                         /* Revert to "active" rate and throughput info */
1759                         index = iwl4965_rate_index_from_plcp(
1760                                 tbl->current_rate.rate_n_flags);
1761                         current_tpt = lq_sta->last_tpt;
1762
1763                         /* Need to set up a new rate table in uCode */
1764                         update_lq = 1;
1765                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1766                 }
1767
1768                 /* Either way, we've made a decision; modulation mode
1769                  * search is done, allow rate adjustment next time. */
1770                 lq_sta->search_better_tbl = 0;
1771                 done_search = 1;        /* Don't switch modes below! */
1772                 goto lq_update;
1773         }
1774
1775         /* (Else) not in search of better modulation mode, try for better
1776          * starting rate, while staying in this mode. */
1777         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1778                                         tbl->lq_type);
1779         low = high_low & 0xff;
1780         high = (high_low >> 8) & 0xff;
1781
1782         /* Collect measured throughputs for current and adjacent rates */
1783         current_tpt = window->average_tpt;
1784         if (low != IWL_RATE_INVALID)
1785                 low_tpt = tbl->win[low].average_tpt;
1786         if (high != IWL_RATE_INVALID)
1787                 high_tpt = tbl->win[high].average_tpt;
1788
1789         /* Assume rate increase */
1790         scale_action = 1;
1791
1792         /* Too many failures, decrease rate */
1793         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1794             (current_tpt == 0)) {
1795                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1796                 scale_action = -1;
1797
1798         /* No throughput measured yet for adjacent rates; try increase. */
1799         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1800                    (high_tpt == IWL_INVALID_VALUE))
1801                 scale_action = 1;
1802
1803         /* Both adjacent throughputs are measured, but neither one has better
1804          * throughput; we're using the best rate, don't change it! */
1805         else if ((low_tpt != IWL_INVALID_VALUE) &&
1806                  (high_tpt != IWL_INVALID_VALUE) &&
1807                  (low_tpt < current_tpt) &&
1808                  (high_tpt < current_tpt))
1809                 scale_action = 0;
1810
1811         /* At least one adjacent rate's throughput is measured,
1812          * and may have better performance. */
1813         else {
1814                 /* Higher adjacent rate's throughput is measured */
1815                 if (high_tpt != IWL_INVALID_VALUE) {
1816                         /* Higher rate has better throughput */
1817                         if (high_tpt > current_tpt)
1818                                 scale_action = 1;
1819                         else {
1820                                 IWL_DEBUG_RATE
1821                                     ("decrease rate because of high tpt\n");
1822                                 scale_action = -1;
1823                         }
1824
1825                 /* Lower adjacent rate's throughput is measured */
1826                 } else if (low_tpt != IWL_INVALID_VALUE) {
1827                         /* Lower rate has better throughput */
1828                         if (low_tpt > current_tpt) {
1829                                 IWL_DEBUG_RATE
1830                                     ("decrease rate because of low tpt\n");
1831                                 scale_action = -1;
1832                         } else
1833                                 scale_action = 1;
1834                 }
1835         }
1836
1837         /* Sanity check; asked for decrease, but success rate or throughput
1838          * has been good at old rate.  Don't change it. */
1839         if (scale_action == -1) {
1840                 if ((low != IWL_RATE_INVALID) &&
1841                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1842                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1843                         scale_action = 0;
1844
1845         /* Sanity check; asked for increase, but success rate has not been great
1846          * even at old rate, higher rate will be worse.  Don't change it. */
1847         } else if ((scale_action == 1) &&
1848                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1849                 scale_action = 0;
1850
1851         switch (scale_action) {
1852         case -1:
1853                 /* Decrease starting rate, update uCode's rate table */
1854                 if (low != IWL_RATE_INVALID) {
1855                         update_lq = 1;
1856                         index = low;
1857                 }
1858                 break;
1859         case 1:
1860                 /* Increase starting rate, update uCode's rate table */
1861                 if (high != IWL_RATE_INVALID) {
1862                         update_lq = 1;
1863                         index = high;
1864                 }
1865
1866                 break;
1867         case 0:
1868                 /* No change */
1869         default:
1870                 break;
1871         }
1872
1873         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1874                     "high %d type %d\n",
1875                      index, scale_action, low, high, tbl->lq_type);
1876
1877  lq_update:
1878         /* Replace uCode's rate table for the destination station. */
1879         if (update_lq) {
1880                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1881                 rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
1882                 rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1883         }
1884
1885         /* Should we stay with this modulation mode, or search for a new one? */
1886         rs_stay_in_table(lq_sta);
1887
1888         /*
1889          * Search for new modulation mode if we're:
1890          * 1)  Not changing rates right now
1891          * 2)  Not just finishing up a search
1892          * 3)  Allowing a new search
1893          */
1894         if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
1895                 /* Save current throughput to compare with "search" throughput*/
1896                 lq_sta->last_tpt = current_tpt;
1897
1898                 /* Select a new "search" modulation mode to try.
1899                  * If one is found, set up the new "search" table. */
1900                 if (is_legacy(tbl->lq_type))
1901                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1902                 else if (is_siso(tbl->lq_type))
1903                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1904                 else
1905                         rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1906
1907                 /* If new "search" mode was selected, set up in uCode table */
1908                 if (lq_sta->search_better_tbl) {
1909                         /* Access the "search" table, clear its history. */
1910                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1911                         for (i = 0; i < IWL_RATE_COUNT; i++)
1912                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1913
1914                         /* Use new "search" start rate */
1915                         index = iwl4965_rate_index_from_plcp(
1916                                         tbl->current_rate.rate_n_flags);
1917
1918                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1919                                      tbl->current_rate.rate_n_flags, index);
1920                         rs_fill_link_cmd(lq_sta, &tbl->current_rate,
1921                                          &lq_sta->lq);
1922                         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1923                 }
1924
1925                 /* If the "active" (non-search) mode was legacy,
1926                  * and we've tried switching antennas,
1927                  * but we haven't been able to try HT modes (not available),
1928                  * stay with best antenna legacy modulation for a while
1929                  * before next round of mode comparisons. */
1930                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1931                 if (is_legacy(tbl1->lq_type) &&
1932 #ifdef CONFIG_IWL4965_HT
1933                    (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1934 #endif
1935                     (lq_sta->action_counter >= 1)) {
1936                         lq_sta->action_counter = 0;
1937                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1938                         rs_set_stay_in_table(1, lq_sta);
1939                 }
1940
1941                 /* If we're in an HT mode, and all 3 mode switch actions
1942                  * have been tried and compared, stay in this best modulation
1943                  * mode for a while before next round of mode comparisons. */
1944                 if (lq_sta->enable_counter &&
1945                     (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1946 #ifdef CONFIG_IWL4965_HT_AGG
1947                         /* If appropriate, set up aggregation! */
1948                         if ((lq_sta->last_tpt > TID_AGG_TPT_THREHOLD) &&
1949                             (priv->lq_mngr.agg_ctrl.auto_agg)) {
1950                                 priv->lq_mngr.agg_ctrl.tid_retry =
1951                                     TID_ALL_SPECIFIED;
1952                                 schedule_work(&priv->agg_work);
1953                         }
1954 #endif /*CONFIG_IWL4965_HT_AGG */
1955                         lq_sta->action_counter = 0;
1956                         rs_set_stay_in_table(0, lq_sta);
1957                 }
1958
1959         /*
1960          * Else, don't search for a new modulation mode.
1961          * Put new timestamp in stay-in-modulation-mode flush timer if:
1962          * 1)  Not changing rates right now
1963          * 2)  Not just finishing up a search
1964          * 3)  flush timer is empty
1965          */
1966         } else {
1967                 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
1968                         lq_sta->flush_timer = jiffies;
1969         }
1970
1971 out:
1972         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1973         i = index;
1974         sta->last_txrate = i;
1975
1976         /* sta->txrate is an index to A mode rates which start
1977          * at IWL_FIRST_OFDM_RATE
1978          */
1979         if (lq_sta->phymode == (u8) MODE_IEEE80211A)
1980                 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1981         else
1982                 sta->txrate = i;
1983
1984         return;
1985 }
1986
1987
1988 static void rs_initialize_lq(struct iwl4965_priv *priv,
1989                              struct ieee80211_conf *conf,
1990                              struct sta_info *sta)
1991 {
1992         int i;
1993         struct iwl4965_lq_sta *lq_sta;
1994         struct iwl4965_scale_tbl_info *tbl;
1995         u8 active_tbl = 0;
1996         int rate_idx;
1997         u8 use_green = rs_use_green(priv, conf);
1998         struct iwl4965_rate mcs_rate;
1999
2000         if (!sta || !sta->rate_ctrl_priv)
2001                 goto out;
2002
2003         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2004         i = sta->last_txrate;
2005
2006         if ((lq_sta->lq.sta_id == 0xff) &&
2007             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2008                 goto out;
2009
2010         if (!lq_sta->search_better_tbl)
2011                 active_tbl = lq_sta->active_tbl;
2012         else
2013                 active_tbl = 1 - lq_sta->active_tbl;
2014
2015         tbl = &(lq_sta->lq_info[active_tbl]);
2016
2017         if ((i < 0) || (i >= IWL_RATE_COUNT))
2018                 i = 0;
2019
2020         mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
2021         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
2022         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
2023
2024         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2025                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
2026
2027         tbl->antenna_type = ANT_AUX;
2028         rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
2029         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
2030             rs_toggle_antenna(&mcs_rate, tbl);
2031
2032         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
2033         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
2034         rs_get_expected_tpt_table(lq_sta, tbl);
2035         rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
2036         rs_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2037  out:
2038         return;
2039 }
2040
2041 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2042                         struct ieee80211_hw_mode *mode, struct sk_buff *skb,
2043                         struct rate_selection *sel)
2044 {
2045
2046         int i;
2047         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2048         struct ieee80211_conf *conf = &local->hw.conf;
2049         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2050         struct sta_info *sta;
2051         u16 fc;
2052         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2053         struct iwl4965_lq_sta *lq_sta;
2054
2055         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2056
2057         sta = sta_info_get(local, hdr->addr1);
2058
2059         /* Send management frames and broadcast/multicast data using lowest
2060          * rate. */
2061         fc = le16_to_cpu(hdr->frame_control);
2062         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2063             !sta || !sta->rate_ctrl_priv) {
2064                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2065                 if (sta)
2066                         sta_info_put(sta);
2067                 return;
2068         }
2069
2070         lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2071         i = sta->last_txrate;
2072
2073         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2074             !lq_sta->ibss_sta_added) {
2075                 u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
2076                 DECLARE_MAC_BUF(mac);
2077
2078                 if (sta_id == IWL_INVALID_STATION) {
2079                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2080                                        print_mac(mac, hdr->addr1));
2081                         sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
2082                                                         0, CMD_ASYNC, NULL);
2083                 }
2084                 if ((sta_id != IWL_INVALID_STATION)) {
2085                         lq_sta->lq.sta_id = sta_id;
2086                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2087                         lq_sta->ibss_sta_added = 1;
2088                         rs_initialize_lq(priv, conf, sta);
2089                 }
2090                 if (!lq_sta->ibss_sta_added)
2091                         goto done;
2092         }
2093
2094  done:
2095         if ((i < 0) || (i > IWL_RATE_COUNT)) {
2096                 sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
2097                 return;
2098         }
2099         sta_info_put(sta);
2100
2101         sel->rate = &priv->ieee_rates[i];
2102 }
2103
2104 static void *rs_alloc_sta(void *priv, gfp_t gfp)
2105 {
2106         struct iwl4965_lq_sta *lq_sta;
2107         int i, j;
2108
2109         IWL_DEBUG_RATE("create station rate scale window\n");
2110
2111         lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2112
2113         if (lq_sta == NULL)
2114                 return NULL;
2115         lq_sta->lq.sta_id = 0xff;
2116
2117
2118         for (j = 0; j < LQ_SIZE; j++)
2119                 for (i = 0; i < IWL_RATE_COUNT; i++)
2120                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2121
2122         return lq_sta;
2123 }
2124
2125 static void rs_rate_init(void *priv_rate, void *priv_sta,
2126                          struct ieee80211_local *local,
2127                          struct sta_info *sta)
2128 {
2129         int i, j;
2130         struct ieee80211_conf *conf = &local->hw.conf;
2131         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
2132         struct iwl4965_priv *priv = (struct iwl4965_priv *)priv_rate;
2133         struct iwl4965_lq_sta *lq_sta = priv_sta;
2134
2135         lq_sta->flush_timer = 0;
2136         lq_sta->supp_rates = sta->supp_rates;
2137         sta->txrate = 3;
2138         for (j = 0; j < LQ_SIZE; j++)
2139                 for (i = 0; i < IWL_RATE_COUNT; i++)
2140                         rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2141
2142         IWL_DEBUG_RATE("rate scale global init\n");
2143         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2144          * the lowest or the highest rate.. Could consider using RSSI from
2145          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2146          * after assoc.. */
2147
2148         lq_sta->ibss_sta_added = 0;
2149         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2150                 u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
2151                 DECLARE_MAC_BUF(mac);
2152
2153                 /* for IBSS the call are from tasklet */
2154                 IWL_DEBUG_HT("LQ: ADD station %s\n",
2155                              print_mac(mac, sta->addr));
2156
2157                 if (sta_id == IWL_INVALID_STATION) {
2158                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
2159                                        print_mac(mac, sta->addr));
2160                         sta_id = iwl4965_add_station_flags(priv, sta->addr,
2161                                                         0, CMD_ASYNC, NULL);
2162                 }
2163                 if ((sta_id != IWL_INVALID_STATION)) {
2164                         lq_sta->lq.sta_id = sta_id;
2165                         lq_sta->lq.rs_table[0].rate_n_flags = 0;
2166                 }
2167                 /* FIXME: this is w/a remove it later */
2168                 priv->assoc_station_added = 1;
2169         }
2170
2171         /* Find highest tx rate supported by hardware and destination station */
2172         for (i = 0; i < mode->num_rates; i++) {
2173                 if ((sta->supp_rates & BIT(i)) &&
2174                     (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
2175                         sta->txrate = i;
2176         }
2177         sta->last_txrate = sta->txrate;
2178         /* For MODE_IEEE80211A, cck rates are at end of rate table */
2179         if (local->hw.conf.phymode == MODE_IEEE80211A)
2180                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
2181
2182         lq_sta->is_dup = 0;
2183         lq_sta->valid_antenna = priv->valid_antenna;
2184         lq_sta->antenna = priv->antenna;
2185         lq_sta->is_green = rs_use_green(priv, conf);
2186         lq_sta->active_rate = priv->active_rate;
2187         lq_sta->active_rate &= ~(0x1000);
2188         lq_sta->active_rate_basic = priv->active_rate_basic;
2189         lq_sta->phymode = priv->phymode;
2190 #ifdef CONFIG_IWL4965_HT
2191         /*
2192          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2193          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2194          */
2195         lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
2196         lq_sta->active_siso_rate |=
2197                         (priv->current_ht_config.supp_mcs_set[0] & 0x1);
2198         lq_sta->active_siso_rate &= ~((u16)0x2);
2199         lq_sta->active_siso_rate =
2200                         lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
2201
2202         /* Same here */
2203         lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
2204         lq_sta->active_mimo_rate |=
2205                         (priv->current_ht_config.supp_mcs_set[1] & 0x1);
2206         lq_sta->active_mimo_rate &= ~((u16)0x2);
2207         lq_sta->active_mimo_rate =
2208                         lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
2209         IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
2210                      lq_sta->active_siso_rate,
2211                      lq_sta->active_mimo_rate);
2212 #endif /*CONFIG_IWL4965_HT*/
2213 #ifdef CONFIG_MAC80211_DEBUGFS
2214         lq_sta->drv = priv;
2215 #endif
2216
2217         if (priv->assoc_station_added)
2218                 priv->lq_mngr.lq_ready = 1;
2219
2220         rs_initialize_lq(priv, conf, sta);
2221 }
2222
2223 static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
2224                             struct iwl4965_rate *tx_mcs,
2225                             struct iwl4965_link_quality_cmd *lq_cmd)
2226 {
2227         int index = 0;
2228         int rate_idx;
2229         int repeat_rate = 0;
2230         u8 ant_toggle_count = 0;
2231         u8 use_ht_possible = 1;
2232         struct iwl4965_rate new_rate;
2233         struct iwl4965_scale_tbl_info tbl_type = { 0 };
2234
2235         /* Override starting rate (index 0) if needed for debug purposes */
2236         rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
2237
2238         /* Interpret rate_n_flags */
2239         rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->phymode,
2240                                   &tbl_type, &rate_idx);
2241
2242         /* How many times should we repeat the initial rate? */
2243         if (is_legacy(tbl_type.lq_type)) {
2244                 ant_toggle_count = 1;
2245                 repeat_rate = IWL_NUMBER_TRY;
2246         } else
2247                 repeat_rate = IWL_HT_NUMBER_TRY;
2248
2249         lq_cmd->general_params.mimo_delimiter =
2250                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2251
2252         /* Fill 1st table entry (index 0) */
2253         lq_cmd->rs_table[index].rate_n_flags =
2254                         cpu_to_le32(tx_mcs->rate_n_flags);
2255         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
2256
2257         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
2258                 lq_cmd->general_params.single_stream_ant_msk
2259                         = LINK_QUAL_ANT_A_MSK;
2260         else
2261                 lq_cmd->general_params.single_stream_ant_msk
2262                         = LINK_QUAL_ANT_B_MSK;
2263
2264         index++;
2265         repeat_rate--;
2266
2267         /* Fill rest of rate table */
2268         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2269                 /* Repeat initial/next rate.
2270                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2271                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2272                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2273                         if (is_legacy(tbl_type.lq_type)) {
2274                                 if (ant_toggle_count <
2275                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2276                                         ant_toggle_count++;
2277                                 else {
2278                                         rs_toggle_antenna(&new_rate, &tbl_type);
2279                                         ant_toggle_count = 1;
2280                                 }
2281                         }
2282
2283                         /* Override next rate if needed for debug purposes */
2284                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2285
2286                         /* Fill next table entry */
2287                         lq_cmd->rs_table[index].rate_n_flags =
2288                                         cpu_to_le32(new_rate.rate_n_flags);
2289                         repeat_rate--;
2290                         index++;
2291                 }
2292
2293                 rs_get_tbl_info_from_mcs(&new_rate, lq_sta->phymode, &tbl_type,
2294                                                 &rate_idx);
2295
2296                 /* Indicate to uCode which entries might be MIMO.
2297                  * If initial rate was MIMO, this will finally end up
2298                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2299                 if (is_mimo(tbl_type.lq_type))
2300                         lq_cmd->general_params.mimo_delimiter = index;
2301
2302                 /* Get next rate */
2303                 rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2304                                   use_ht_possible, &new_rate);
2305
2306                 /* How many times should we repeat the next rate? */
2307                 if (is_legacy(tbl_type.lq_type)) {
2308                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
2309                                 ant_toggle_count++;
2310                         else {
2311                                 rs_toggle_antenna(&new_rate, &tbl_type);
2312                                 ant_toggle_count = 1;
2313                         }
2314                         repeat_rate = IWL_NUMBER_TRY;
2315                 } else
2316                         repeat_rate = IWL_HT_NUMBER_TRY;
2317
2318                 /* Don't allow HT rates after next pass.
2319                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2320                 use_ht_possible = 0;
2321
2322                 /* Override next rate if needed for debug purposes */
2323                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2324
2325                 /* Fill next table entry */
2326                 lq_cmd->rs_table[index].rate_n_flags =
2327                                 cpu_to_le32(new_rate.rate_n_flags);
2328
2329                 index++;
2330                 repeat_rate--;
2331         }
2332
2333         lq_cmd->general_params.dual_stream_ant_msk = 3;
2334         lq_cmd->agg_params.agg_dis_start_th = 3;
2335         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2336 }
2337
2338 static void *rs_alloc(struct ieee80211_local *local)
2339 {
2340         return local->hw.priv;
2341 }
2342 /* rate scale requires free function to be implemented */
2343 static void rs_free(void *priv_rate)
2344 {
2345         return;
2346 }
2347
2348 static void rs_clear(void *priv_rate)
2349 {
2350         struct iwl4965_priv *priv = (struct iwl4965_priv *) priv_rate;
2351
2352         IWL_DEBUG_RATE("enter\n");
2353
2354         priv->lq_mngr.lq_ready = 0;
2355 #ifdef CONFIG_IWL4965_HT
2356 #ifdef CONFIG_IWL4965_HT_AGG
2357         if (priv->lq_mngr.agg_ctrl.granted_ba)
2358                 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
2359 #endif /*CONFIG_IWL4965_HT_AGG */
2360 #endif /* CONFIG_IWL4965_HT */
2361
2362         IWL_DEBUG_RATE("leave\n");
2363 }
2364
2365 static void rs_free_sta(void *priv, void *priv_sta)
2366 {
2367         struct iwl4965_lq_sta *lq_sta = priv_sta;
2368
2369         IWL_DEBUG_RATE("enter\n");
2370         kfree(lq_sta);
2371         IWL_DEBUG_RATE("leave\n");
2372 }
2373
2374
2375 #ifdef CONFIG_MAC80211_DEBUGFS
2376 static int open_file_generic(struct inode *inode, struct file *file)
2377 {
2378         file->private_data = inode->i_private;
2379         return 0;
2380 }
2381 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2382                                 struct iwl4965_rate *mcs, int index)
2383 {
2384         u32 base_rate;
2385
2386         if (lq_sta->phymode == (u8) MODE_IEEE80211A)
2387                 base_rate = 0x800D;
2388         else
2389                 base_rate = 0x820A;
2390
2391         if (lq_sta->dbg_fixed.rate_n_flags) {
2392                 if (index < 12)
2393                         mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
2394                 else
2395                         mcs->rate_n_flags = base_rate;
2396                 IWL_DEBUG_RATE("Fixed rate ON\n");
2397                 return;
2398         }
2399
2400         IWL_DEBUG_RATE("Fixed rate OFF\n");
2401 }
2402
2403 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2404                         const char __user *user_buf, size_t count, loff_t *ppos)
2405 {
2406         struct iwl4965_lq_sta *lq_sta = file->private_data;
2407         char buf[64];
2408         int buf_size;
2409         u32 parsed_rate;
2410
2411         memset(buf, 0, sizeof(buf));
2412         buf_size = min(count, sizeof(buf) -  1);
2413         if (copy_from_user(buf, user_buf, buf_size))
2414                 return -EFAULT;
2415
2416         if (sscanf(buf, "%x", &parsed_rate) == 1)
2417                 lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
2418         else
2419                 lq_sta->dbg_fixed.rate_n_flags = 0;
2420
2421         lq_sta->active_rate = 0x0FFF;   /* 1 - 54 MBits, includes CCK */
2422         lq_sta->active_siso_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2423         lq_sta->active_mimo_rate = 0x1FD0;      /* 6 - 60 MBits, no 9, no CCK */
2424
2425         IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2426                 lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
2427
2428         if (lq_sta->dbg_fixed.rate_n_flags) {
2429                 rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
2430                 rs_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2431         }
2432
2433         return count;
2434 }
2435
2436 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2437                         char __user *user_buf, size_t count, loff_t *ppos)
2438 {
2439         char buff[1024];
2440         int desc = 0;
2441         int i = 0;
2442
2443         struct iwl4965_lq_sta *lq_sta = file->private_data;
2444
2445         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2446         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2447                         lq_sta->total_failed, lq_sta->total_success,
2448                         lq_sta->active_rate);
2449         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2450                         lq_sta->dbg_fixed.rate_n_flags);
2451         desc += sprintf(buff+desc, "general:"
2452                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2453                 lq_sta->lq.general_params.flags,
2454                 lq_sta->lq.general_params.mimo_delimiter,
2455                 lq_sta->lq.general_params.single_stream_ant_msk,
2456                 lq_sta->lq.general_params.dual_stream_ant_msk);
2457
2458         desc += sprintf(buff+desc, "agg:"
2459                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2460                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2461                         lq_sta->lq.agg_params.agg_dis_start_th,
2462                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
2463
2464         desc += sprintf(buff+desc,
2465                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2466                         lq_sta->lq.general_params.start_rate_index[0],
2467                         lq_sta->lq.general_params.start_rate_index[1],
2468                         lq_sta->lq.general_params.start_rate_index[2],
2469                         lq_sta->lq.general_params.start_rate_index[3]);
2470
2471
2472         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2473                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2474                         i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2475
2476         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2477 }
2478
2479 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2480         .write = rs_sta_dbgfs_scale_table_write,
2481         .read = rs_sta_dbgfs_scale_table_read,
2482         .open = open_file_generic,
2483 };
2484 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2485                         char __user *user_buf, size_t count, loff_t *ppos)
2486 {
2487         char buff[1024];
2488         int desc = 0;
2489         int i, j;
2490
2491         struct iwl4965_lq_sta *lq_sta = file->private_data;
2492         for (i = 0; i < LQ_SIZE; i++) {
2493                 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2494                                 "rate=0x%X\n",
2495                                 lq_sta->active_tbl == i?"*":"x",
2496                                 lq_sta->lq_info[i].lq_type,
2497                                 lq_sta->lq_info[i].is_SGI,
2498                                 lq_sta->lq_info[i].is_fat,
2499                                 lq_sta->lq_info[i].is_dup,
2500                                 lq_sta->lq_info[i].current_rate.rate_n_flags);
2501                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2502                         desc += sprintf(buff+desc,
2503                                 "counter=%d success=%d %%=%d\n",
2504                                 lq_sta->lq_info[i].win[j].counter,
2505                                 lq_sta->lq_info[i].win[j].success_counter,
2506                                 lq_sta->lq_info[i].win[j].success_ratio);
2507                 }
2508         }
2509         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2510 }
2511
2512 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2513         .read = rs_sta_dbgfs_stats_table_read,
2514         .open = open_file_generic,
2515 };
2516
2517 static void rs_add_debugfs(void *priv, void *priv_sta,
2518                                         struct dentry *dir)
2519 {
2520         struct iwl4965_lq_sta *lq_sta = priv_sta;
2521         lq_sta->rs_sta_dbgfs_scale_table_file =
2522                 debugfs_create_file("rate_scale_table", 0600, dir,
2523                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2524         lq_sta->rs_sta_dbgfs_stats_table_file =
2525                 debugfs_create_file("rate_stats_table", 0600, dir,
2526                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
2527 }
2528
2529 static void rs_remove_debugfs(void *priv, void *priv_sta)
2530 {
2531         struct iwl4965_lq_sta *lq_sta = priv_sta;
2532         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2533         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2534 }
2535 #endif
2536
2537 static struct rate_control_ops rs_ops = {
2538         .module = NULL,
2539         .name = RS_NAME,
2540         .tx_status = rs_tx_status,
2541         .get_rate = rs_get_rate,
2542         .rate_init = rs_rate_init,
2543         .clear = rs_clear,
2544         .alloc = rs_alloc,
2545         .free = rs_free,
2546         .alloc_sta = rs_alloc_sta,
2547         .free_sta = rs_free_sta,
2548 #ifdef CONFIG_MAC80211_DEBUGFS
2549         .add_sta_debugfs = rs_add_debugfs,
2550         .remove_sta_debugfs = rs_remove_debugfs,
2551 #endif
2552 };
2553
2554 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2555 {
2556         struct ieee80211_local *local = hw_to_local(hw);
2557         struct iwl4965_priv *priv = hw->priv;
2558         struct iwl4965_lq_sta *lq_sta;
2559         struct sta_info *sta;
2560         int cnt = 0, i;
2561         u32 samples = 0, success = 0, good = 0;
2562         unsigned long now = jiffies;
2563         u32 max_time = 0;
2564         u8 lq_type, antenna;
2565
2566         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2567         if (!sta || !sta->rate_ctrl_priv) {
2568                 if (sta) {
2569                         sta_info_put(sta);
2570                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2571                 } else
2572                         IWL_DEBUG_RATE("leave - no station!\n");
2573                 return sprintf(buf, "station %d not found\n", sta_id);
2574         }
2575
2576         lq_sta = (void *)sta->rate_ctrl_priv;
2577
2578         lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2579         antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
2580
2581         if (is_legacy(lq_type))
2582                 i = IWL_RATE_54M_INDEX;
2583         else
2584                 i = IWL_RATE_60M_INDEX;
2585         while (1) {
2586                 u64 mask;
2587                 int j;
2588                 int active = lq_sta->active_tbl;
2589
2590                 cnt +=
2591                     sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
2592
2593                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2594                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2595                         buf[cnt++] =
2596                                 (lq_sta->lq_info[active].win[i].data & mask)
2597                                 ? '1' : '0';
2598
2599                 samples += lq_sta->lq_info[active].win[i].counter;
2600                 good += lq_sta->lq_info[active].win[i].success_counter;
2601                 success += lq_sta->lq_info[active].win[i].success_counter *
2602                            iwl4965_rates[i].ieee;
2603
2604                 if (lq_sta->lq_info[active].win[i].stamp) {
2605                         int delta =
2606                                    jiffies_to_msecs(now -
2607                                    lq_sta->lq_info[active].win[i].stamp);
2608
2609                         if (delta > max_time)
2610                                 max_time = delta;
2611
2612                         cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2613                 } else
2614                         buf[cnt++] = '\n';
2615
2616                 j = iwl4965_get_prev_ieee_rate(i);
2617                 if (j == i)
2618                         break;
2619                 i = j;
2620         }
2621
2622         /* Display the average rate of all samples taken.
2623          *
2624          * NOTE:  We multiply # of samples by 2 since the IEEE measurement
2625          * added from iwl4965_rates is actually 2X the rate */
2626         if (samples)
2627                 cnt += sprintf(&buf[cnt],
2628                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2629                          "%3d%% success (%d good packets over %d tries)\n",
2630                          success / (2 * samples), (success * 5 / samples) % 10,
2631                          max_time, good * 100 / samples, good, samples);
2632         else
2633                 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2634
2635         cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2636                          "active_search %d rate index %d\n", lq_type, antenna,
2637                          lq_sta->search_better_tbl, sta->last_txrate);
2638
2639         sta_info_put(sta);
2640         return cnt;
2641 }
2642
2643 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2644 {
2645         struct iwl4965_priv *priv = hw->priv;
2646
2647         priv->lq_mngr.lq_ready = 1;
2648 }
2649
2650 void iwl4965_rate_control_register(struct ieee80211_hw *hw)
2651 {
2652         ieee80211_rate_control_register(&rs_ops);
2653 }
2654
2655 void iwl4965_rate_control_unregister(struct ieee80211_hw *hw)
2656 {
2657         ieee80211_rate_control_unregister(&rs_ops);
2658 }
2659