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.h>
  40 #include <linux/wireless.h>
  41
  42 #define IWL 4965
  43
  44 #include "../net/mac80211/ieee80211_rate.h"
  45
  46 #include "iwlwifi.h"
  47 #include "iwl-helpers.h"
  48
  49 #define RS_NAME "iwl-4965-rs"
  50
  51 #define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
  52 #define IWL_NUMBER_TRY      1
  53 #define IWL_HT_NUMBER_TRY   3
  54
  55 #define IWL_RATE_MAX_WINDOW             62
  56 #define IWL_RATE_HIGH_TH                10880
  57 #define IWL_RATE_MIN_FAILURE_TH         6
  58 #define IWL_RATE_MIN_SUCCESS_TH         8
  59 #define IWL_RATE_DECREASE_TH            1920
  60 #define IWL_RATE_INCREASE_TH            8960
  61 #define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)        /*2 seconds */
  62
  63 static u8 rs_ht_to_legacy[] = {
  64         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  65         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  66         IWL_RATE_6M_INDEX,
  67         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  68         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  69         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  70         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  71 };
  72
  73 struct iwl_rate {
  74         u32 rate_n_flags;
  75 } __attribute__ ((packed));
  76
  77 struct iwl_rate_scale_data {
  78         u64 data;
  79         s32 success_counter;
  80         s32 success_ratio;
  81         s32 counter;
  82         s32 average_tpt;
  83         unsigned long stamp;
  84 };
  85
  86 struct iwl_scale_tbl_info {
  87         enum iwl_table_type lq_type;
  88         enum iwl_antenna_type antenna_type;
  89         u8 is_SGI;
  90         u8 is_fat;
  91         u8 is_dup;
  92         u8 action;
  93         s32 *expected_tpt;
  94         struct iwl_rate current_rate;
  95         struct iwl_rate_scale_data win[IWL_RATE_COUNT];
  96 };
  97
  98 struct iwl_rate_scale_priv {
  99         u8 active_tbl;
 100         u8 enable_counter;
 101         u8 stay_in_tbl;
 102         u8 search_better_tbl;
 103         s32 last_tpt;
 104         u32 table_count_limit;
 105         u32 max_failure_limit;
 106         u32 max_success_limit;
 107         u32 table_count;
 108         u32 total_failed;
 109         u32 total_success;
 110         u32 flush_timer;
 111         u8 action_counter;
 112         u8 antenna;
 113         u8 valid_antenna;
 114         u8 is_green;
 115         u8 is_dup;
 116         u8 phymode;
 117         u8 ibss_sta_added;
 118         u32 supp_rates;
 119         u16 active_rate;
 120         u16 active_siso_rate;
 121         u16 active_mimo_rate;
 122         u16 active_rate_basic;
 123         struct iwl_link_quality_cmd lq;
 124         struct iwl_scale_tbl_info lq_info[LQ_SIZE];
 125 #ifdef CONFIG_MAC80211_DEBUGFS
 126        struct dentry *rs_sta_dbgfs_scale_table_file;
 127 #endif
 128 };
 129
 130 static void rs_rate_scale_perform(struct iwl_priv *priv,
 131                                    struct net_device *dev,
 132                                    struct ieee80211_hdr *hdr,
 133                                    struct sta_info *sta);
 134 static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
 135                              struct iwl_rate *tx_mcs,
 136                              struct iwl_link_quality_cmd *tbl);
 137
 138
 139 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
 140         0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
 141 };
 142
 143 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
 144         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
 145 };
 146
 147 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
 148         0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
 149 };
 150
 151 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
 152         0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
 153 };
 154
 155 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
 156         0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
 157 };
 158
 159 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
 160         0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
 161 };
 162
 163 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
 164         0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
 165 };
 166
 167 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
 168         0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
 169 };
 170
 171 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
 172         0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
 173 };
 174
 175 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
 176         0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
 177 };
 178
 179 static int iwl_lq_sync_callback(struct iwl_priv *priv,
 180                                 struct iwl_cmd *cmd, struct sk_buff *skb)
 181 {
 182         /*We didn't cache the SKB; let the caller free it */
 183         return 1;
 184 }
 185
 186 static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
 187 {
 188         return (u8)(rate_n_flags & 0xFF);
 189 }
 190
 191 static int rs_send_lq_cmd(struct iwl_priv *priv,
 192                           struct iwl_link_quality_cmd *lq, u8 flags)
 193 {
 194 #ifdef CONFIG_IWLWIFI_DEBUG
 195         int i;
 196 #endif
 197         int rc = -1;
 198
 199         struct iwl_host_cmd cmd = {
 200                 .id = REPLY_TX_LINK_QUALITY_CMD,
 201                 .len = sizeof(struct iwl_link_quality_cmd),
 202                 .meta.flags = flags,
 203                 .data = lq,
 204         };
 205
 206         if ((lq->sta_id == 0xFF) &&
 207             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
 208                 return rc;
 209
 210         if (lq->sta_id == 0xFF)
 211                 lq->sta_id = IWL_AP_ID;
 212
 213         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
 214         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
 215                        lq->general_params.single_stream_ant_msk,
 216                        lq->general_params.dual_stream_ant_msk);
 217 #ifdef CONFIG_IWLWIFI_DEBUG
 218         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 219                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
 220                                 i, lq->rs_table[i].rate_n_flags);
 221 #endif
 222
 223         if (flags & CMD_ASYNC)
 224                 cmd.meta.u.callback = iwl_lq_sync_callback;
 225
 226         if (iwl_is_associated(priv) && priv->assoc_station_added &&
 227             priv->lq_mngr.lq_ready)
 228                 rc = iwl_send_cmd(priv, &cmd);
 229
 230         return rc;
 231 }
 232
 233 static int rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 234 {
 235         window->data = 0;
 236         window->success_counter = 0;
 237         window->success_ratio = IWL_INVALID_VALUE;
 238         window->counter = 0;
 239         window->average_tpt = IWL_INVALID_VALUE;
 240         window->stamp = 0;
 241
 242         return 0;
 243 }
 244
 245 static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
 246                               int scale_index, s32 tpt, u32 status)
 247 {
 248         int rc = 0;
 249         struct iwl_rate_scale_data *window = NULL;
 250         u64 mask;
 251         u8 win_size = IWL_RATE_MAX_WINDOW;
 252         s32 fail_count;
 253
 254         if (scale_index < 0)
 255                 return -1;
 256
 257         if (scale_index >= IWL_RATE_COUNT)
 258                 return -1;
 259
 260         window = &(windows[scale_index]);
 261
 262         if (window->counter >= win_size) {
 263
 264                 window->counter = win_size - 1;
 265                 mask = 1;
 266                 mask = (mask << (win_size - 1));
 267                 if ((window->data & mask)) {
 268                         window->data &= ~mask;
 269                         window->success_counter = window->success_counter - 1;
 270                 }
 271         }
 272
 273         window->counter = window->counter + 1;
 274         mask = window->data;
 275         window->data = (mask << 1);
 276         if (status != 0) {
 277                 window->success_counter = window->success_counter + 1;
 278                 window->data |= 0x1;
 279         }
 280
 281         if (window->counter > 0)
 282                 window->success_ratio = 128 * (100 * window->success_counter)
 283                                         / window->counter;
 284         else
 285                 window->success_ratio = IWL_INVALID_VALUE;
 286
 287         fail_count = window->counter - window->success_counter;
 288
 289         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 290             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 291                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 292         else
 293                 window->average_tpt = IWL_INVALID_VALUE;
 294
 295         window->stamp = jiffies;
 296
 297         return rc;
 298 }
 299
 300 int static rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
 301                            struct iwl_scale_tbl_info *tbl,
 302                            int index, u8 use_green)
 303 {
 304         int rc = 0;
 305
 306         if (is_legacy(tbl->lq_type)) {
 307                 mcs_rate->rate_n_flags = iwl_rates[index].plcp;
 308                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 309                         mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
 310
 311         } else if (is_siso(tbl->lq_type)) {
 312                 if (index > IWL_LAST_OFDM_RATE)
 313                         index = IWL_LAST_OFDM_RATE;
 314                  mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
 315                                           RATE_MCS_HT_MSK;
 316         } else {
 317                 if (index > IWL_LAST_OFDM_RATE)
 318                         index = IWL_LAST_OFDM_RATE;
 319                 mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
 320                                          RATE_MCS_HT_MSK;
 321         }
 322
 323         switch (tbl->antenna_type) {
 324         case ANT_BOTH:
 325                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
 326                 break;
 327         case ANT_MAIN:
 328                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 329                 break;
 330         case ANT_AUX:
 331                 mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 332                 break;
 333         case ANT_NONE:
 334                 break;
 335         }
 336
 337         if (is_legacy(tbl->lq_type))
 338                 return rc;
 339
 340         if (tbl->is_fat) {
 341                 if (tbl->is_dup)
 342                         mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
 343                 else
 344                         mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
 345         }
 346         if (tbl->is_SGI)
 347                 mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
 348
 349         if (use_green) {
 350                 mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
 351                 if (is_siso(tbl->lq_type))
 352                         mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
 353         }
 354         return rc;
 355 }
 356
 357 static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
 358                                     int phymode, struct iwl_scale_tbl_info *tbl,
 359                                     int *rate_idx)
 360 {
 361         int index;
 362         u32 ant_msk;
 363
 364         index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
 365
 366         if (index  == IWL_RATE_INVALID) {
 367                 *rate_idx = -1;
 368                 return -1;
 369         }
 370         tbl->is_SGI = 0;
 371         tbl->is_fat = 0;
 372         tbl->is_dup = 0;
 373         tbl->antenna_type = ANT_BOTH;
 374
 375         if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
 376                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 377
 378                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 379                         tbl->lq_type = LQ_NONE;
 380                 else {
 381
 382                         if (phymode == MODE_IEEE80211A)
 383                                 tbl->lq_type = LQ_A;
 384                         else
 385                                 tbl->lq_type = LQ_G;
 386
 387                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 388                                 tbl->antenna_type = ANT_MAIN;
 389                         else
 390                                 tbl->antenna_type = ANT_AUX;
 391                 }
 392                 *rate_idx = index;
 393
 394         } else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
 395                                         <= IWL_RATE_SISO_60M_PLCP) {
 396                 tbl->lq_type = LQ_SISO;
 397
 398                 ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
 399                 if (ant_msk == RATE_MCS_ANT_AB_MSK)
 400                         tbl->lq_type = LQ_NONE;
 401                 else {
 402                         if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
 403                                 tbl->antenna_type = ANT_MAIN;
 404                         else
 405                                 tbl->antenna_type = ANT_AUX;
 406                 }
 407                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 408                         tbl->is_SGI = 1;
 409
 410                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 411                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 412                         tbl->is_fat = 1;
 413
 414                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 415                         tbl->is_dup = 1;
 416
 417                 *rate_idx = index;
 418         } else {
 419                 tbl->lq_type = LQ_MIMO;
 420                 if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
 421                         tbl->is_SGI = 1;
 422
 423                 if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
 424                     (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
 425                         tbl->is_fat = 1;
 426
 427                 if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
 428                         tbl->is_dup = 1;
 429                 *rate_idx = index;
 430         }
 431         return 0;
 432 }
 433
 434 static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
 435                                      struct iwl_scale_tbl_info *tbl)
 436 {
 437         if (tbl->antenna_type == ANT_AUX) {
 438                 tbl->antenna_type = ANT_MAIN;
 439                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
 440                 new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
 441         } else {
 442                 tbl->antenna_type = ANT_AUX;
 443                 new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
 444                 new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
 445         }
 446 }
 447
 448 static inline s8 rs_use_green(struct iwl_priv *priv)
 449 {
 450         s8 rc = 0;
 451 #ifdef CONFIG_IWLWIFI_HT
 452         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 453                 return 0;
 454
 455         if ((priv->current_assoc_ht.is_green_field) &&
 456             !(priv->current_assoc_ht.operating_mode & 0x4))
 457                 rc = 1;
 458 #endif  /*CONFIG_IWLWIFI_HT */
 459         return rc;
 460 }
 461
 462 /**
 463  * rs_get_supported_rates - get the available rates
 464  *
 465  * if management frame or broadcast frame only return
 466  * basic available rates.
 467  *
 468  */
 469 static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
 470                                    struct ieee80211_hdr *hdr,
 471                                    enum iwl_table_type rate_type,
 472                                    u16 *data_rate)
 473 {
 474         if (is_legacy(rate_type))
 475                 *data_rate = lq_data->active_rate;
 476         else {
 477                 if (is_siso(rate_type))
 478                         *data_rate = lq_data->active_siso_rate;
 479                 else
 480                         *data_rate = lq_data->active_mimo_rate;
 481         }
 482
 483         if (hdr && is_multicast_ether_addr(hdr->addr1) &&
 484             lq_data->active_rate_basic)
 485                 *data_rate = lq_data->active_rate_basic;
 486 }
 487
 488 static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
 489 {
 490         u8 high = IWL_RATE_INVALID;
 491         u8 low = IWL_RATE_INVALID;
 492
 493         /* 802.11A or ht walks to the next literal adjascent rate in
 494          * the rate table */
 495         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 496                 int i;
 497                 u32 mask;
 498
 499                 /* Find the previous rate that is in the rate mask */
 500                 i = index - 1;
 501                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 502                         if (rate_mask & mask) {
 503                                 low = i;
 504                                 break;
 505                         }
 506                 }
 507
 508                 /* Find the next rate that is in the rate mask */
 509                 i = index + 1;
 510                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 511                         if (rate_mask & mask) {
 512                                 high = i;
 513                                 break;
 514                         }
 515                 }
 516
 517                 return (high << 8) | low;
 518         }
 519
 520         low = index;
 521         while (low != IWL_RATE_INVALID) {
 522                 low = iwl_rates[low].prev_rs;
 523                 if (low == IWL_RATE_INVALID)
 524                         break;
 525                 if (rate_mask & (1 << low))
 526                         break;
 527                 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
 528         }
 529
 530         high = index;
 531         while (high != IWL_RATE_INVALID) {
 532                 high = iwl_rates[high].next_rs;
 533                 if (high == IWL_RATE_INVALID)
 534                         break;
 535                 if (rate_mask & (1 << high))
 536                         break;
 537                 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
 538         }
 539
 540         return (high << 8) | low;
 541 }
 542
 543 static int rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
 544                              struct iwl_scale_tbl_info *tbl, u8 scale_index,
 545                              u8 ht_possible, struct iwl_rate *mcs_rate)
 546 {
 547         s32 low;
 548         u16 rate_mask;
 549         u16 high_low;
 550         u8 switch_to_legacy = 0;
 551         u8 is_green = lq_data->is_green;
 552
 553         /* check if we need to switch from HT to legacy rates.
 554          * assumption is that mandatory rates (1Mbps or 6Mbps)
 555          * are always supported (spec demand) */
 556         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 557                 switch_to_legacy = 1;
 558                 scale_index = rs_ht_to_legacy[scale_index];
 559                 if (lq_data->phymode == MODE_IEEE80211A)
 560                         tbl->lq_type = LQ_A;
 561                 else
 562                         tbl->lq_type = LQ_G;
 563
 564                 if ((tbl->antenna_type == ANT_BOTH) ||
 565                     (tbl->antenna_type == ANT_NONE))
 566                         tbl->antenna_type = ANT_MAIN;
 567
 568                 tbl->is_fat = 0;
 569                 tbl->is_SGI = 0;
 570         }
 571
 572         rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
 573
 574         /* mask with station rate restriction */
 575         if (is_legacy(tbl->lq_type)) {
 576                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
 577                         rate_mask  = (u16)(rate_mask &
 578                            (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
 579                 else
 580                         rate_mask = (u16)(rate_mask & lq_data->supp_rates);
 581         }
 582
 583         /* if we did switched from HT to legacy check current rate */
 584         if ((switch_to_legacy) &&
 585             (rate_mask & (1 << scale_index))) {
 586                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 587                 return 0;
 588         }
 589
 590         high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
 591         low = high_low & 0xff;
 592
 593         if (low != IWL_RATE_INVALID)
 594                 rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
 595         else
 596                 rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
 597
 598         return 0;
 599 }
 600
 601 static void rs_tx_status(void *priv_rate,
 602                          struct net_device *dev,
 603                          struct sk_buff *skb,
 604                          struct ieee80211_tx_status *tx_resp)
 605 {
 606         int status;
 607         u8 retries;
 608         int rs_index, index = 0;
 609         struct iwl_rate_scale_priv *lq;
 610         struct iwl_link_quality_cmd *table;
 611         struct sta_info *sta;
 612         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 613         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
 614         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 615         struct iwl_rate_scale_data *window = NULL;
 616         struct iwl_rate_scale_data *search_win = NULL;
 617         struct iwl_rate tx_mcs;
 618         struct iwl_scale_tbl_info tbl_type;
 619         struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
 620         u8 active_index = 0;
 621         u16 fc = le16_to_cpu(hdr->frame_control);
 622         s32 tpt = 0;
 623
 624         IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
 625
 626         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
 627                 return;
 628
 629         retries = tx_resp->retry_count;
 630
 631         if (retries > 15)
 632                 retries = 15;
 633
 634
 635         sta = sta_info_get(local, hdr->addr1);
 636
 637         if (!sta || !sta->rate_ctrl_priv) {
 638                 if (sta)
 639                         sta_info_put(sta);
 640                 return;
 641         }
 642
 643         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
 644
 645         if (!priv->lq_mngr.lq_ready)
 646                 return;
 647
 648         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
 649                 return;
 650
 651         table = &lq->lq;
 652         active_index = lq->active_tbl;
 653
 654         lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
 655         if (!lq->antenna)
 656                 lq->antenna = lq->valid_antenna;
 657
 658         lq->antenna = lq->valid_antenna;
 659         curr_tbl = &(lq->lq_info[active_index]);
 660         search_tbl = &(lq->lq_info[(1 - active_index)]);
 661         window = (struct iwl_rate_scale_data *)
 662             &(curr_tbl->win[0]);
 663         search_win = (struct iwl_rate_scale_data *)
 664             &(search_tbl->win[0]);
 665
 666         tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 667
 668         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 669                                   &tbl_type, &rs_index);
 670         if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
 671                 IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
 672                              rs_index, tx_mcs.rate_n_flags);
 673                 sta_info_put(sta);
 674                 return;
 675         }
 676
 677         if (retries &&
 678             (tx_mcs.rate_n_flags !=
 679                                 le32_to_cpu(table->rs_table[0].rate_n_flags))) {
 680                 IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
 681                                 tx_mcs.rate_n_flags,
 682                                 le32_to_cpu(table->rs_table[0].rate_n_flags));
 683                 sta_info_put(sta);
 684                 return;
 685         }
 686
 687         while (retries) {
 688                 tx_mcs.rate_n_flags =
 689                     le32_to_cpu(table->rs_table[index].rate_n_flags);
 690                 rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 691                                           &tbl_type, &rs_index);
 692
 693                 if ((tbl_type.lq_type == search_tbl->lq_type) &&
 694                     (tbl_type.antenna_type == search_tbl->antenna_type) &&
 695                     (tbl_type.is_SGI == search_tbl->is_SGI)) {
 696                         if (search_tbl->expected_tpt)
 697                                 tpt = search_tbl->expected_tpt[rs_index];
 698                         else
 699                                 tpt = 0;
 700                         rs_collect_tx_data(search_win,
 701                                             rs_index, tpt, 0);
 702                 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 703                            (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 704                            (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 705                         if (curr_tbl->expected_tpt)
 706                                 tpt = curr_tbl->expected_tpt[rs_index];
 707                         else
 708                                 tpt = 0;
 709                         rs_collect_tx_data(window, rs_index, tpt, 0);
 710                 }
 711                 if (lq->stay_in_tbl)
 712                         lq->total_failed++;
 713                 --retries;
 714                 index++;
 715
 716         }
 717
 718         if (!tx_resp->retry_count)
 719                 tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
 720         else
 721                 tx_mcs.rate_n_flags =
 722                         le32_to_cpu(table->rs_table[index].rate_n_flags);
 723
 724         rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
 725                                   &tbl_type, &rs_index);
 726
 727         if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
 728                 status = 1;
 729         else
 730                 status = 0;
 731
 732         if ((tbl_type.lq_type == search_tbl->lq_type) &&
 733             (tbl_type.antenna_type == search_tbl->antenna_type) &&
 734             (tbl_type.is_SGI == search_tbl->is_SGI)) {
 735                 if (search_tbl->expected_tpt)
 736                         tpt = search_tbl->expected_tpt[rs_index];
 737                 else
 738                         tpt = 0;
 739                 rs_collect_tx_data(search_win,
 740                                     rs_index, tpt, status);
 741         } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
 742                    (tbl_type.antenna_type == curr_tbl->antenna_type) &&
 743                    (tbl_type.is_SGI == curr_tbl->is_SGI)) {
 744                 if (curr_tbl->expected_tpt)
 745                         tpt = curr_tbl->expected_tpt[rs_index];
 746                 else
 747                         tpt = 0;
 748                 rs_collect_tx_data(window, rs_index, tpt, status);
 749         }
 750
 751         if (lq->stay_in_tbl) {
 752                 if (status)
 753                         lq->total_success++;
 754                 else
 755                         lq->total_failed++;
 756         }
 757
 758         rs_rate_scale_perform(priv, dev, hdr, sta);
 759         sta_info_put(sta);
 760         return;
 761 }
 762
 763 static u8 rs_is_ant_connected(u8 valid_antenna,
 764                               enum iwl_antenna_type antenna_type)
 765 {
 766         if (antenna_type == ANT_AUX)
 767                 return ((valid_antenna & 0x2) ? 1:0);
 768         else if (antenna_type == ANT_MAIN)
 769                 return ((valid_antenna & 0x1) ? 1:0);
 770         else if (antenna_type == ANT_BOTH) {
 771                 if ((valid_antenna & 0x3) == 0x3)
 772                         return 1;
 773                 else
 774                         return 0;
 775         }
 776
 777         return 1;
 778 }
 779
 780 static u8 rs_is_other_ant_connected(u8 valid_antenna,
 781                                     enum iwl_antenna_type antenna_type)
 782 {
 783         if (antenna_type == ANT_AUX)
 784                 return (rs_is_ant_connected(valid_antenna, ANT_MAIN));
 785         else
 786                 return (rs_is_ant_connected(valid_antenna, ANT_AUX));
 787
 788         return 0;
 789 }
 790
 791 static void rs_set_stay_in_table(u8 is_legacy,
 792                                  struct iwl_rate_scale_priv *lq_data)
 793 {
 794         IWL_DEBUG_HT("we are staying in the same table\n");
 795         lq_data->stay_in_tbl = 1;
 796         if (is_legacy) {
 797                 lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 798                 lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 799                 lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
 800         } else {
 801                 lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 802                 lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 803                 lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 804         }
 805         lq_data->table_count = 0;
 806         lq_data->total_failed = 0;
 807         lq_data->total_success = 0;
 808 }
 809
 810 static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
 811                                       struct iwl_scale_tbl_info *tbl)
 812 {
 813         if (is_legacy(tbl->lq_type)) {
 814                 if (!is_a_band(tbl->lq_type))
 815                         tbl->expected_tpt = expected_tpt_G;
 816                 else
 817                         tbl->expected_tpt = expected_tpt_A;
 818         } else if (is_siso(tbl->lq_type)) {
 819                 if (tbl->is_fat && !lq_data->is_dup)
 820                         if (tbl->is_SGI)
 821                                 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
 822                         else
 823                                 tbl->expected_tpt = expected_tpt_siso40MHz;
 824                 else if (tbl->is_SGI)
 825                         tbl->expected_tpt = expected_tpt_siso20MHzSGI;
 826                 else
 827                         tbl->expected_tpt = expected_tpt_siso20MHz;
 828
 829         } else if (is_mimo(tbl->lq_type)) {
 830                 if (tbl->is_fat && !lq_data->is_dup)
 831                         if (tbl->is_SGI)
 832                                 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
 833                         else
 834                                 tbl->expected_tpt = expected_tpt_mimo40MHz;
 835                 else if (tbl->is_SGI)
 836                         tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
 837                 else
 838                         tbl->expected_tpt = expected_tpt_mimo20MHz;
 839         } else
 840                 tbl->expected_tpt = expected_tpt_G;
 841 }
 842
 843 #ifdef CONFIG_IWLWIFI_HT
 844 static s32 rs_get_best_rate(struct iwl_priv *priv,
 845                             struct iwl_rate_scale_priv *lq_data,
 846                             struct iwl_scale_tbl_info *tbl,
 847                             u16 rate_mask, s8 index, s8 rate)
 848 {
 849         struct iwl_scale_tbl_info *active_tbl =
 850             &(lq_data->lq_info[lq_data->active_tbl]);
 851         s32 new_rate, high, low, start_hi;
 852         s32 active_sr = active_tbl->win[index].success_ratio;
 853         s32 *tpt_tbl = tbl->expected_tpt;
 854         s32 active_tpt = active_tbl->expected_tpt[index];
 855         u16 high_low;
 856
 857         new_rate = high = low = start_hi = IWL_RATE_INVALID;
 858
 859         for (; ;) {
 860                 high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
 861
 862                 low = high_low & 0xff;
 863                 high = (high_low >> 8) & 0xff;
 864
 865                 if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
 866                      ((active_sr > IWL_RATE_DECREASE_TH) &&
 867                       (active_sr <= IWL_RATE_HIGH_TH) &&
 868                       (tpt_tbl[rate] <= active_tpt))) ||
 869                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
 870                      (tpt_tbl[rate] > active_tpt))) {
 871
 872                         if (start_hi != IWL_RATE_INVALID) {
 873                                 new_rate = start_hi;
 874                                 break;
 875                         }
 876                         new_rate = rate;
 877                         if (low != IWL_RATE_INVALID)
 878                                 rate = low;
 879                         else
 880                                 break;
 881                 } else {
 882                         if (new_rate != IWL_RATE_INVALID)
 883                                 break;
 884                         else if (high != IWL_RATE_INVALID) {
 885                                 start_hi = high;
 886                                 rate = high;
 887                         } else {
 888                                 new_rate = rate;
 889                                 break;
 890                         }
 891                 }
 892         }
 893
 894         return new_rate;
 895 }
 896 #endif                          /* CONFIG_IWLWIFI_HT */
 897
 898 static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
 899 {
 900         return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
 901 }
 902
 903 static int rs_switch_to_mimo(struct iwl_priv *priv,
 904                              struct iwl_rate_scale_priv *lq_data,
 905                              struct iwl_scale_tbl_info *tbl, int index)
 906 {
 907         int rc = -1;
 908 #ifdef CONFIG_IWLWIFI_HT
 909         u16 rate_mask;
 910         s32 rate;
 911         s8 is_green = lq_data->is_green;
 912
 913         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 914                 return -1;
 915
 916         IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
 917         tbl->lq_type = LQ_MIMO;
 918         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
 919                                 &rate_mask);
 920
 921         if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
 922                 return -1;
 923
 924         if (!rs_is_both_ant_supp(lq_data->antenna))
 925                 return -1;
 926
 927         rc = 0;
 928         tbl->is_dup = lq_data->is_dup;
 929         tbl->action = 0;
 930         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
 931                 tbl->is_fat = 1;
 932         else
 933                 tbl->is_fat = 0;
 934
 935         if (tbl->is_fat) {
 936                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
 937                         tbl->is_SGI = 1;
 938                 else
 939                         tbl->is_SGI = 0;
 940         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
 941                 tbl->is_SGI = 1;
 942         else
 943                 tbl->is_SGI = 0;
 944
 945         rs_get_expected_tpt_table(lq_data, tbl);
 946
 947         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
 948
 949         IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
 950         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
 951                 return -1;
 952         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
 953
 954         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
 955                      tbl->current_rate.rate_n_flags, is_green);
 956
 957 #endif                          /*CONFIG_IWLWIFI_HT */
 958         return rc;
 959 }
 960
 961 static int rs_switch_to_siso(struct iwl_priv *priv,
 962                              struct iwl_rate_scale_priv *lq_data,
 963                              struct iwl_scale_tbl_info *tbl, int index)
 964 {
 965         int rc = -1;
 966 #ifdef CONFIG_IWLWIFI_HT
 967         u16 rate_mask;
 968         u8 is_green = lq_data->is_green;
 969         s32 rate;
 970
 971         IWL_DEBUG_HT("LQ: try to switch to SISO\n");
 972         if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
 973                 return -1;
 974
 975         rc = 0;
 976         tbl->is_dup = lq_data->is_dup;
 977         tbl->lq_type = LQ_SISO;
 978         tbl->action = 0;
 979         rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
 980                                 &rate_mask);
 981
 982         if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
 983                 tbl->is_fat = 1;
 984         else
 985                 tbl->is_fat = 0;
 986
 987         if (tbl->is_fat) {
 988                 if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
 989                         tbl->is_SGI = 1;
 990                 else
 991                         tbl->is_SGI = 0;
 992         } else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
 993                 tbl->is_SGI = 1;
 994         else
 995                 tbl->is_SGI = 0;
 996
 997         if (is_green)
 998                 tbl->is_SGI = 0;
 999
1000         rs_get_expected_tpt_table(lq_data, tbl);
1001         rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
1002
1003         IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
1004         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1005                 IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
1006                              rate, rate_mask);
1007                 return -1;
1008         }
1009         rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
1010         IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
1011                      tbl->current_rate.rate_n_flags, is_green);
1012
1013 #endif                          /*CONFIG_IWLWIFI_HT */
1014         return rc;
1015 }
1016
1017 static int rs_move_legacy_other(struct iwl_priv *priv,
1018                                 struct iwl_rate_scale_priv *lq_data,
1019                                 int index)
1020 {
1021         int rc = 0;
1022         struct iwl_scale_tbl_info *tbl =
1023             &(lq_data->lq_info[lq_data->active_tbl]);
1024         struct iwl_scale_tbl_info *search_tbl =
1025             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1026         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1027         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1028                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1029         u8 start_action = tbl->action;
1030
1031         for (; ;) {
1032                 switch (tbl->action) {
1033                 case IWL_LEGACY_SWITCH_ANTENNA:
1034                         IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
1035
1036                         search_tbl->lq_type = LQ_NONE;
1037                         lq_data->action_counter++;
1038                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1039                                 break;
1040                         if (!rs_is_other_ant_connected(lq_data->antenna,
1041                                                         tbl->antenna_type))
1042                                 break;
1043
1044                         memcpy(search_tbl, tbl, sz);
1045
1046                         rs_toggle_antenna(&(search_tbl->current_rate),
1047                                            search_tbl);
1048                         rs_get_expected_tpt_table(lq_data, search_tbl);
1049                         lq_data->search_better_tbl = 1;
1050                         goto out;
1051
1052                 case IWL_LEGACY_SWITCH_SISO:
1053                         IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
1054                         memcpy(search_tbl, tbl, sz);
1055                         search_tbl->lq_type = LQ_SISO;
1056                         search_tbl->is_SGI = 0;
1057                         search_tbl->is_fat = 0;
1058                         rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1059                                                index);
1060                         if (!rc) {
1061                                 lq_data->search_better_tbl = 1;
1062                                 lq_data->action_counter = 0;
1063                         }
1064                         if (!rc)
1065                                 goto out;
1066
1067                         break;
1068                 case IWL_LEGACY_SWITCH_MIMO:
1069                         IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
1070                         memcpy(search_tbl, tbl, sz);
1071                         search_tbl->lq_type = LQ_MIMO;
1072                         search_tbl->is_SGI = 0;
1073                         search_tbl->is_fat = 0;
1074                         search_tbl->antenna_type = ANT_BOTH;
1075                         rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1076                                                index);
1077                         if (!rc) {
1078                                 lq_data->search_better_tbl = 1;
1079                                 lq_data->action_counter = 0;
1080                         }
1081                         if (!rc)
1082                                 goto out;
1083                         break;
1084                 }
1085                 tbl->action++;
1086                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1087                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1088
1089                 if (tbl->action == start_action)
1090                         break;
1091
1092         }
1093         return 0;
1094
1095  out:
1096         tbl->action++;
1097         if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
1098                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1099         return 0;
1100
1101 }
1102
1103 static int rs_move_siso_to_other(struct iwl_priv *priv,
1104                                  struct iwl_rate_scale_priv *lq_data,
1105                                  int index)
1106 {
1107         int rc = -1;
1108         u8 is_green = lq_data->is_green;
1109         struct iwl_scale_tbl_info *tbl =
1110             &(lq_data->lq_info[lq_data->active_tbl]);
1111         struct iwl_scale_tbl_info *search_tbl =
1112             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1113         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1114         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1115                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1116         u8 start_action = tbl->action;
1117
1118         for (;;) {
1119                 lq_data->action_counter++;
1120                 switch (tbl->action) {
1121                 case IWL_SISO_SWITCH_ANTENNA:
1122                         IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
1123                         search_tbl->lq_type = LQ_NONE;
1124                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1125                                 break;
1126                         if (!rs_is_other_ant_connected(lq_data->antenna,
1127                                                        tbl->antenna_type))
1128                                 break;
1129
1130                         memcpy(search_tbl, tbl, sz);
1131                         search_tbl->action = IWL_SISO_SWITCH_MIMO;
1132                         rs_toggle_antenna(&(search_tbl->current_rate),
1133                                            search_tbl);
1134                         lq_data->search_better_tbl = 1;
1135
1136                         goto out;
1137
1138                 case IWL_SISO_SWITCH_MIMO:
1139                         IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
1140                         memcpy(search_tbl, tbl, sz);
1141                         search_tbl->lq_type = LQ_MIMO;
1142                         search_tbl->is_SGI = 0;
1143                         search_tbl->is_fat = 0;
1144                         search_tbl->antenna_type = ANT_BOTH;
1145                         rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
1146                                                index);
1147                         if (!rc)
1148                                 lq_data->search_better_tbl = 1;
1149
1150                         if (!rc)
1151                                 goto out;
1152                         break;
1153                 case IWL_SISO_SWITCH_GI:
1154                         IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
1155                         memcpy(search_tbl, tbl, sz);
1156                         search_tbl->action = 0;
1157                         if (search_tbl->is_SGI)
1158                                 search_tbl->is_SGI = 0;
1159                         else if (!is_green)
1160                                 search_tbl->is_SGI = 1;
1161                         else
1162                                 break;
1163                         lq_data->search_better_tbl = 1;
1164                         if ((tbl->lq_type == LQ_SISO) &&
1165                             (tbl->is_SGI)) {
1166                                 s32 tpt = lq_data->last_tpt / 100;
1167                                 if (((!tbl->is_fat) &&
1168                                      (tpt >= expected_tpt_siso20MHz[index])) ||
1169                                     ((tbl->is_fat) &&
1170                                      (tpt >= expected_tpt_siso40MHz[index])))
1171                                         lq_data->search_better_tbl = 0;
1172                         }
1173                         rs_get_expected_tpt_table(lq_data, search_tbl);
1174                         rs_mcs_from_tbl(&search_tbl->current_rate,
1175                                              search_tbl, index, is_green);
1176                         goto out;
1177                 }
1178                 tbl->action++;
1179                 if (tbl->action > IWL_SISO_SWITCH_GI)
1180                         tbl->action = IWL_SISO_SWITCH_ANTENNA;
1181
1182                 if (tbl->action == start_action)
1183                         break;
1184         }
1185         return 0;
1186
1187  out:
1188         tbl->action++;
1189         if (tbl->action > IWL_SISO_SWITCH_GI)
1190                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1191         return 0;
1192 }
1193
1194 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1195                                  struct iwl_rate_scale_priv *lq_data,
1196                                  int index)
1197 {
1198         int rc = -1;
1199         s8 is_green = lq_data->is_green;
1200         struct iwl_scale_tbl_info *tbl =
1201             &(lq_data->lq_info[lq_data->active_tbl]);
1202         struct iwl_scale_tbl_info *search_tbl =
1203             &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1204         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1205                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1206         u8 start_action = tbl->action;
1207
1208         for (;;) {
1209                 lq_data->action_counter++;
1210                 switch (tbl->action) {
1211                 case IWL_MIMO_SWITCH_ANTENNA_A:
1212                 case IWL_MIMO_SWITCH_ANTENNA_B:
1213                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
1214                         memcpy(search_tbl, tbl, sz);
1215                         search_tbl->lq_type = LQ_SISO;
1216                         search_tbl->is_SGI = 0;
1217                         search_tbl->is_fat = 0;
1218                         if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1219                                 search_tbl->antenna_type = ANT_MAIN;
1220                         else
1221                                 search_tbl->antenna_type = ANT_AUX;
1222
1223                         rc = rs_switch_to_siso(priv, lq_data, search_tbl,
1224                                                index);
1225                         if (!rc) {
1226                                 lq_data->search_better_tbl = 1;
1227                                 goto out;
1228                         }
1229                         break;
1230
1231                 case IWL_MIMO_SWITCH_GI:
1232                         IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
1233                         memcpy(search_tbl, tbl, sz);
1234                         search_tbl->lq_type = LQ_MIMO;
1235                         search_tbl->antenna_type = ANT_BOTH;
1236                         search_tbl->action = 0;
1237                         if (search_tbl->is_SGI)
1238                                 search_tbl->is_SGI = 0;
1239                         else
1240                                 search_tbl->is_SGI = 1;
1241                         lq_data->search_better_tbl = 1;
1242                         if ((tbl->lq_type == LQ_MIMO) &&
1243                             (tbl->is_SGI)) {
1244                                 s32 tpt = lq_data->last_tpt / 100;
1245                                 if (((!tbl->is_fat) &&
1246                                      (tpt >= expected_tpt_mimo20MHz[index])) ||
1247                                     ((tbl->is_fat) &&
1248                                      (tpt >= expected_tpt_mimo40MHz[index])))
1249                                         lq_data->search_better_tbl = 0;
1250                         }
1251                         rs_get_expected_tpt_table(lq_data, search_tbl);
1252                         rs_mcs_from_tbl(&search_tbl->current_rate,
1253                                              search_tbl, index, is_green);
1254                         goto out;
1255
1256                 }
1257                 tbl->action++;
1258                 if (tbl->action > IWL_MIMO_SWITCH_GI)
1259                         tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1260
1261                 if (tbl->action == start_action)
1262                         break;
1263         }
1264
1265         return 0;
1266  out:
1267         tbl->action++;
1268         if (tbl->action > IWL_MIMO_SWITCH_GI)
1269                 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1270         return 0;
1271
1272 }
1273
1274 static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
1275 {
1276         struct iwl_scale_tbl_info *tbl;
1277         int i;
1278         int active_tbl;
1279         int flush_interval_passed = 0;
1280
1281         active_tbl = lq_data->active_tbl;
1282
1283         tbl = &(lq_data->lq_info[active_tbl]);
1284
1285         if (lq_data->stay_in_tbl) {
1286
1287                 if (lq_data->flush_timer)
1288                         flush_interval_passed =
1289                             time_after(jiffies,
1290                                        (unsigned long)(lq_data->flush_timer +
1291                                         IWL_RATE_SCALE_FLUSH_INTVL));
1292
1293                 flush_interval_passed = 0;
1294                 if ((lq_data->total_failed > lq_data->max_failure_limit) ||
1295                     (lq_data->total_success > lq_data->max_success_limit) ||
1296                     ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
1297                      && (flush_interval_passed))) {
1298                         IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
1299                                      lq_data->total_failed,
1300                                      lq_data->total_success,
1301                                      flush_interval_passed);
1302                         lq_data->stay_in_tbl = 0;
1303                         lq_data->total_failed = 0;
1304                         lq_data->total_success = 0;
1305                         lq_data->flush_timer = 0;
1306                 } else if (lq_data->table_count > 0) {
1307                         lq_data->table_count++;
1308                         if (lq_data->table_count >=
1309                             lq_data->table_count_limit) {
1310                                 lq_data->table_count = 0;
1311
1312                                 IWL_DEBUG_HT("LQ: stay in table clear win\n");
1313                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1314                                         rs_rate_scale_clear_window(
1315                                                 &(tbl->win[i]));
1316                         }
1317                 }
1318
1319                 if (!lq_data->stay_in_tbl) {
1320                         for (i = 0; i < IWL_RATE_COUNT; i++)
1321                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1322                 }
1323         }
1324 }
1325
1326 static void rs_rate_scale_perform(struct iwl_priv *priv,
1327                                   struct net_device *dev,
1328                                   struct ieee80211_hdr *hdr,
1329                                   struct sta_info *sta)
1330 {
1331         int low = IWL_RATE_INVALID;
1332         int high = IWL_RATE_INVALID;
1333         int index;
1334         int i;
1335         struct iwl_rate_scale_data *window = NULL;
1336         int current_tpt = IWL_INVALID_VALUE;
1337         int low_tpt = IWL_INVALID_VALUE;
1338         int high_tpt = IWL_INVALID_VALUE;
1339         u32 fail_count;
1340         s8 scale_action = 0;
1341         u16 fc, rate_mask;
1342         u8 update_lq = 0;
1343         struct iwl_rate_scale_priv *lq_data;
1344         struct iwl_scale_tbl_info *tbl, *tbl1;
1345         u16 rate_scale_index_msk = 0;
1346         struct iwl_rate mcs_rate;
1347         u8 is_green = 0;
1348         u8 active_tbl = 0;
1349         u8 done_search = 0;
1350         u16 high_low;
1351
1352         IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1353
1354         fc = le16_to_cpu(hdr->frame_control);
1355         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1356                 /* Send management frames and broadcast/multicast data using
1357                  * lowest rate. */
1358                 /* TODO: this could probably be improved.. */
1359                 return;
1360         }
1361
1362         if (!sta || !sta->rate_ctrl_priv)
1363                 return;
1364
1365         if (!priv->lq_mngr.lq_ready) {
1366                 IWL_DEBUG_RATE("still rate scaling not ready\n");
1367                 return;
1368         }
1369         lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1370
1371         if (!lq_data->search_better_tbl)
1372                 active_tbl = lq_data->active_tbl;
1373         else
1374                 active_tbl = 1 - lq_data->active_tbl;
1375
1376         tbl = &(lq_data->lq_info[active_tbl]);
1377         is_green = lq_data->is_green;
1378
1379         index = sta->last_txrate;
1380
1381         IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1382                        tbl->lq_type);
1383
1384         rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
1385                                 &rate_mask);
1386
1387         IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1388
1389         /* mask with station rate restriction */
1390         if (is_legacy(tbl->lq_type)) {
1391                 if (lq_data->phymode == (u8) MODE_IEEE80211A)
1392                         rate_scale_index_msk = (u16) (rate_mask &
1393                                 (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
1394                 else
1395                         rate_scale_index_msk = (u16) (rate_mask &
1396                                                       lq_data->supp_rates);
1397
1398         } else
1399                 rate_scale_index_msk = rate_mask;
1400
1401         if (!rate_scale_index_msk)
1402                 rate_scale_index_msk = rate_mask;
1403
1404         if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
1405                 index = IWL_INVALID_VALUE;
1406                 update_lq = 1;
1407
1408                 /* get the lowest availabe rate */
1409                 for (i = 0; i <= IWL_RATE_COUNT; i++) {
1410                         if ((1 << i) & rate_scale_index_msk)
1411                                 index = i;
1412                 }
1413
1414                 if (index == IWL_INVALID_VALUE) {
1415                         IWL_WARNING("Can not find a suitable rate\n");
1416                         return;
1417                 }
1418         }
1419
1420         if (!tbl->expected_tpt)
1421                 rs_get_expected_tpt_table(lq_data, tbl);
1422
1423         window = &(tbl->win[index]);
1424
1425         fail_count = window->counter - window->success_counter;
1426         if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1427              (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
1428             || (tbl->expected_tpt == NULL)) {
1429                 IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
1430                                "for index %d\n",
1431                                window->success_counter, window->counter, index);
1432                 window->average_tpt = IWL_INVALID_VALUE;
1433                 rs_stay_in_table(lq_data);
1434                 if (update_lq) {
1435                         rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1436                         rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1437                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1438                 }
1439                 goto out;
1440
1441         } else
1442                 window->average_tpt = ((window->success_ratio *
1443                                         tbl->expected_tpt[index] + 64) / 128);
1444
1445         if (lq_data->search_better_tbl) {
1446                 int success_limit = IWL_RATE_SCALE_SWITCH;
1447
1448                 if ((window->success_ratio > success_limit) ||
1449                     (window->average_tpt > lq_data->last_tpt)) {
1450                         if (!is_legacy(tbl->lq_type)) {
1451                                 IWL_DEBUG_HT("LQ: we are switching to HT"
1452                                              " rate suc %d current tpt %d"
1453                                              " old tpt %d\n",
1454                                              window->success_ratio,
1455                                              window->average_tpt,
1456                                              lq_data->last_tpt);
1457                                 lq_data->enable_counter = 1;
1458                         }
1459                         lq_data->active_tbl = active_tbl;
1460                         current_tpt = window->average_tpt;
1461                 } else {
1462                         tbl->lq_type = LQ_NONE;
1463                         active_tbl = lq_data->active_tbl;
1464                         tbl = &(lq_data->lq_info[active_tbl]);
1465
1466                         index = iwl_rate_index_from_plcp(
1467                                 tbl->current_rate.rate_n_flags);
1468
1469                         update_lq = 1;
1470                         current_tpt = lq_data->last_tpt;
1471                         IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
1472                 }
1473                 lq_data->search_better_tbl = 0;
1474                 done_search = 1;
1475                 goto lq_update;
1476         }
1477
1478         high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
1479                                         tbl->lq_type);
1480         low = high_low & 0xff;
1481         high = (high_low >> 8) & 0xff;
1482
1483         current_tpt = window->average_tpt;
1484
1485         if (low != IWL_RATE_INVALID)
1486                 low_tpt = tbl->win[low].average_tpt;
1487
1488         if (high != IWL_RATE_INVALID)
1489                 high_tpt = tbl->win[high].average_tpt;
1490
1491
1492         scale_action = 1;
1493
1494         if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
1495             (current_tpt == 0)) {
1496                 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1497                 scale_action = -1;
1498         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1499                    (high_tpt == IWL_INVALID_VALUE))
1500                 scale_action = 1;
1501         else if ((low_tpt != IWL_INVALID_VALUE) &&
1502                  (high_tpt != IWL_INVALID_VALUE) &&
1503                  (low_tpt < current_tpt) &&
1504                  (high_tpt < current_tpt))
1505                 scale_action = 0;
1506         else {
1507                 if (high_tpt != IWL_INVALID_VALUE) {
1508                         if (high_tpt > current_tpt)
1509                                 scale_action = 1;
1510                         else {
1511                                 IWL_DEBUG_RATE
1512                                     ("decrease rate because of high tpt\n");
1513                                 scale_action = -1;
1514                         }
1515                 } else if (low_tpt != IWL_INVALID_VALUE) {
1516                         if (low_tpt > current_tpt) {
1517                                 IWL_DEBUG_RATE
1518                                     ("decrease rate because of low tpt\n");
1519                                 scale_action = -1;
1520                         } else
1521                                 scale_action = 1;
1522                 }
1523         }
1524
1525         if (scale_action == -1) {
1526                 if ((low != IWL_RATE_INVALID) &&
1527                     ((window->success_ratio > IWL_RATE_HIGH_TH) ||
1528                      (current_tpt > (100 * tbl->expected_tpt[low]))))
1529                         scale_action = 0;
1530         } else if ((scale_action == 1) &&
1531                    (window->success_ratio < IWL_RATE_INCREASE_TH))
1532                 scale_action = 0;
1533
1534         switch (scale_action) {
1535         case -1:
1536                 if (low != IWL_RATE_INVALID) {
1537                         update_lq = 1;
1538                         index = low;
1539                 }
1540                 break;
1541         case 1:
1542                 if (high != IWL_RATE_INVALID) {
1543                         update_lq = 1;
1544                         index = high;
1545                 }
1546
1547                 break;
1548         case 0:
1549         default:
1550                 break;
1551         }
1552
1553         IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
1554                     "high %d type %d\n",
1555                      index, scale_action, low, high, tbl->lq_type);
1556
1557  lq_update:
1558         if (update_lq) {
1559                 rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
1560                 rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq);
1561                 rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1562         }
1563         rs_stay_in_table(lq_data);
1564
1565         if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
1566                 lq_data->last_tpt = current_tpt;
1567
1568                 if (is_legacy(tbl->lq_type))
1569                         rs_move_legacy_other(priv, lq_data, index);
1570                 else if (is_siso(tbl->lq_type))
1571                         rs_move_siso_to_other(priv, lq_data, index);
1572                 else
1573                         rs_move_mimo_to_other(priv, lq_data, index);
1574
1575                 if (lq_data->search_better_tbl) {
1576                         tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
1577                         for (i = 0; i < IWL_RATE_COUNT; i++)
1578                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1579
1580                         index = iwl_rate_index_from_plcp(
1581                                         tbl->current_rate.rate_n_flags);
1582
1583                         IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
1584                                      tbl->current_rate.rate_n_flags, index);
1585                         rs_fill_link_cmd(lq_data, &tbl->current_rate,
1586                                          &lq_data->lq);
1587                         rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
1588                 }
1589                 tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
1590
1591                 if (is_legacy(tbl1->lq_type) &&
1592 #ifdef CONFIG_IWLWIFI_HT
1593                     !priv->current_assoc_ht.is_ht &&
1594 #endif
1595                     (lq_data->action_counter >= 1)) {
1596                         lq_data->action_counter = 0;
1597                         IWL_DEBUG_HT("LQ: STAY in legacy table\n");
1598                         rs_set_stay_in_table(1, lq_data);
1599                 }
1600
1601                 if (lq_data->enable_counter &&
1602                     (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
1603 #ifdef CONFIG_IWLWIFI_HT_AGG
1604                         if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
1605                             (priv->lq_mngr.agg_ctrl.auto_agg)) {
1606                                 priv->lq_mngr.agg_ctrl.tid_retry =
1607                                     TID_ALL_SPECIFIED;
1608                                 schedule_work(&priv->agg_work);
1609                         }
1610 #endif /*CONFIG_IWLWIFI_HT_AGG */
1611                         lq_data->action_counter = 0;
1612                         rs_set_stay_in_table(0, lq_data);
1613                 }
1614         } else {
1615                 if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
1616                         lq_data->flush_timer = jiffies;
1617         }
1618
1619 out:
1620         rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
1621         i = index;
1622         sta->last_txrate = i;
1623
1624         /* sta->txrate is an index to A mode rates which start
1625          * at IWL_FIRST_OFDM_RATE
1626          */
1627         if (lq_data->phymode == (u8) MODE_IEEE80211A)
1628                 sta->txrate = i - IWL_FIRST_OFDM_RATE;
1629         else
1630                 sta->txrate = i;
1631
1632         return;
1633 }
1634
1635
1636 static void rs_initialize_lq(struct iwl_priv *priv,
1637                              struct sta_info *sta)
1638 {
1639         int i;
1640         struct iwl_rate_scale_priv *lq;
1641         struct iwl_scale_tbl_info *tbl;
1642         u8 active_tbl = 0;
1643         int rate_idx;
1644         u8 use_green = rs_use_green(priv);
1645         struct iwl_rate mcs_rate;
1646
1647         if (!sta || !sta->rate_ctrl_priv)
1648                 goto out;
1649
1650         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1651         i = sta->last_txrate;
1652
1653         if ((lq->lq.sta_id == 0xff) &&
1654             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
1655                 goto out;
1656
1657         if (!lq->search_better_tbl)
1658                 active_tbl = lq->active_tbl;
1659         else
1660                 active_tbl = 1 - lq->active_tbl;
1661
1662         tbl = &(lq->lq_info[active_tbl]);
1663
1664         if ((i < 0) || (i >= IWL_RATE_COUNT))
1665                 i = 0;
1666
1667         mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
1668         mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
1669         mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
1670
1671         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
1672                 mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
1673
1674         tbl->antenna_type = ANT_AUX;
1675         rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
1676         if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
1677             rs_toggle_antenna(&mcs_rate, tbl);
1678
1679         rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
1680         tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
1681         rs_get_expected_tpt_table(lq, tbl);
1682         rs_fill_link_cmd(lq, &mcs_rate, &lq->lq);
1683         rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
1684  out:
1685         return;
1686 }
1687
1688 static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
1689                                                  *local)
1690 {
1691         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1692         int i;
1693
1694         for (i = 0; i < mode->num_rates; i++) {
1695                 struct ieee80211_rate *rate = &mode->rates[i];
1696
1697                 if (rate->flags & IEEE80211_RATE_SUPPORTED)
1698                         return rate;
1699         }
1700
1701         return &mode->rates[0];
1702 }
1703
1704 static struct ieee80211_rate *rs_get_rate(void *priv_rate,
1705                                                struct net_device *dev,
1706                                                struct sk_buff *skb,
1707                                                struct rate_control_extra
1708                                                *extra)
1709 {
1710
1711         int i;
1712         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1713         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1714         struct sta_info *sta;
1715         u16 fc;
1716         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1717         struct iwl_rate_scale_priv *lq;
1718
1719         IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
1720
1721         memset(extra, 0, sizeof(*extra));
1722
1723         fc = le16_to_cpu(hdr->frame_control);
1724         if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1725                 /* Send management frames and broadcast/multicast data using
1726                  * lowest rate. */
1727                 /* TODO: this could probably be improved.. */
1728                 return rs_get_lowest_rate(local);
1729         }
1730
1731         sta = sta_info_get(local, hdr->addr1);
1732
1733         if (!sta || !sta->rate_ctrl_priv) {
1734                 if (sta)
1735                         sta_info_put(sta);
1736                 return rs_get_lowest_rate(local);
1737         }
1738
1739         lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
1740         i = sta->last_txrate;
1741
1742         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
1743                 u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
1744                 DECLARE_MAC_BUF(mac);
1745
1746                 if (sta_id == IWL_INVALID_STATION) {
1747                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
1748                                        print_mac(mac, hdr->addr1));
1749                         sta_id = iwl_add_station(priv,
1750                                                  hdr->addr1, 0, CMD_ASYNC);
1751                 }
1752                 if ((sta_id != IWL_INVALID_STATION)) {
1753                         lq->lq.sta_id = sta_id;
1754                         lq->lq.rs_table[0].rate_n_flags = 0;
1755                         lq->ibss_sta_added = 1;
1756                         rs_initialize_lq(priv, sta);
1757                 }
1758                 if (!lq->ibss_sta_added)
1759                         goto done;
1760         }
1761
1762  done:
1763         sta_info_put(sta);
1764         if ((i < 0) || (i > IWL_RATE_COUNT))
1765                 return rs_get_lowest_rate(local);
1766
1767         return &priv->ieee_rates[i];
1768 }
1769
1770 static void *rs_alloc_sta(void *priv, gfp_t gfp)
1771 {
1772         struct iwl_rate_scale_priv *crl;
1773         int i, j;
1774
1775         IWL_DEBUG_RATE("create station rate scale window\n");
1776
1777         crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
1778
1779         if (crl == NULL)
1780                 return NULL;
1781         crl->lq.sta_id = 0xff;
1782
1783
1784         for (j = 0; j < LQ_SIZE; j++)
1785                 for (i = 0; i < IWL_RATE_COUNT; i++)
1786                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1787
1788         return crl;
1789 }
1790
1791 static void rs_rate_init(void *priv_rate, void *priv_sta,
1792                          struct ieee80211_local *local,
1793                          struct sta_info *sta)
1794 {
1795         int i, j;
1796         struct ieee80211_hw_mode *mode = local->oper_hw_mode;
1797         struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
1798         struct iwl_rate_scale_priv *crl = priv_sta;
1799
1800         crl->flush_timer = 0;
1801         crl->supp_rates = sta->supp_rates;
1802         sta->txrate = 3;
1803         for (j = 0; j < LQ_SIZE; j++)
1804                 for (i = 0; i < IWL_RATE_COUNT; i++)
1805                         rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
1806
1807         IWL_DEBUG_RATE("rate scale global init\n");
1808         /* TODO: what is a good starting rate for STA? About middle? Maybe not
1809          * the lowest or the highest rate.. Could consider using RSSI from
1810          * previous packets? Need to have IEEE 802.1X auth succeed immediately
1811          * after assoc.. */
1812
1813         crl->ibss_sta_added = 0;
1814         if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
1815                 u8 sta_id = iwl_hw_find_station(priv, sta->addr);
1816                 DECLARE_MAC_BUF(mac);
1817
1818                 /* for IBSS the call are from tasklet */
1819                 IWL_DEBUG_HT("LQ: ADD station %s\n",
1820                              print_mac(mac, sta->addr));
1821
1822                 if (sta_id == IWL_INVALID_STATION) {
1823                         IWL_DEBUG_RATE("LQ: ADD station %s\n",
1824                                        print_mac(mac, sta->addr));
1825                         sta_id = iwl_add_station(priv,
1826                                                  sta->addr, 0, CMD_ASYNC);
1827                 }
1828                 if ((sta_id != IWL_INVALID_STATION)) {
1829                         crl->lq.sta_id = sta_id;
1830                         crl->lq.rs_table[0].rate_n_flags = 0;
1831                 }
1832                 /* FIXME: this is w/a remove it later */
1833                 priv->assoc_station_added = 1;
1834         }
1835
1836         for (i = 0; i < mode->num_rates; i++) {
1837                 if ((sta->supp_rates & BIT(i)) &&
1838                     (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
1839                         sta->txrate = i;
1840         }
1841         sta->last_txrate = sta->txrate;
1842         /* For MODE_IEEE80211A mode cck rate are at end
1843          * rate table
1844          */
1845         if (local->hw.conf.phymode == MODE_IEEE80211A)
1846                 sta->last_txrate += IWL_FIRST_OFDM_RATE;
1847
1848         crl->is_dup = priv->is_dup;
1849         crl->valid_antenna = priv->valid_antenna;
1850         crl->antenna = priv->antenna;
1851         crl->is_green = rs_use_green(priv);
1852         crl->active_rate = priv->active_rate;
1853         crl->active_rate &= ~(0x1000);
1854         crl->active_rate_basic = priv->active_rate_basic;
1855         crl->phymode = priv->phymode;
1856 #ifdef CONFIG_IWLWIFI_HT
1857         crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
1858         crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
1859         crl->active_siso_rate &= ~((u16)0x2);
1860         crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
1861
1862         crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
1863         crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
1864         crl->active_mimo_rate &= ~((u16)0x2);
1865         crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
1866         IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
1867                      crl->active_mimo_rate);
1868 #endif /*CONFIG_IWLWIFI_HT*/
1869
1870         if (priv->assoc_station_added)
1871                 priv->lq_mngr.lq_ready = 1;
1872
1873         rs_initialize_lq(priv, sta);
1874 }
1875
1876 static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
1877                             struct iwl_rate *tx_mcs,
1878                             struct iwl_link_quality_cmd *lq_cmd)
1879 {
1880         int index = 0;
1881         int rc = 0;
1882         int rate_idx;
1883         u8 ant_toggle_count = 0;
1884         u8 use_ht_possible = 1;
1885         u8 repeat_cur_rate = 0;
1886         struct iwl_rate new_rate;
1887         struct iwl_scale_tbl_info tbl_type = { 0 };
1888
1889         rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
1890                                   &tbl_type, &rate_idx);
1891
1892         if (is_legacy(tbl_type.lq_type)) {
1893                 ant_toggle_count = 1;
1894                 repeat_cur_rate = IWL_NUMBER_TRY;
1895         } else
1896                 repeat_cur_rate = IWL_HT_NUMBER_TRY;
1897
1898         lq_cmd->general_params.mimo_delimiter =
1899                         is_mimo(tbl_type.lq_type) ? 1 : 0;
1900         lq_cmd->rs_table[index].rate_n_flags =
1901                         cpu_to_le32(tx_mcs->rate_n_flags);
1902         new_rate.rate_n_flags = tx_mcs->rate_n_flags;
1903
1904         if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
1905                 lq_cmd->general_params.single_stream_ant_msk = 1;
1906         else
1907                 lq_cmd->general_params.single_stream_ant_msk = 2;
1908
1909         index++;
1910         repeat_cur_rate--;
1911
1912         while (index < LINK_QUAL_MAX_RETRY_NUM) {
1913                 while (repeat_cur_rate && (index < LINK_QUAL_MAX_RETRY_NUM)) {
1914                         if (is_legacy(tbl_type.lq_type)) {
1915                                 if (ant_toggle_count <
1916                                     NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1917                                         ant_toggle_count++;
1918                                 else {
1919                                         rs_toggle_antenna(&new_rate, &tbl_type);
1920                                         ant_toggle_count = 1;
1921                                 }
1922                         }
1923                         lq_cmd->rs_table[index].rate_n_flags =
1924                                         cpu_to_le32(new_rate.rate_n_flags);
1925                         repeat_cur_rate--;
1926                         index++;
1927                 }
1928
1929                 rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
1930                                                 &rate_idx);
1931
1932                 if (is_mimo(tbl_type.lq_type))
1933                         lq_cmd->general_params.mimo_delimiter = index;
1934
1935                 rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
1936                                   use_ht_possible, &new_rate);
1937
1938                 if (is_legacy(tbl_type.lq_type)) {
1939                         if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
1940                                 ant_toggle_count++;
1941                         else {
1942                                 rs_toggle_antenna(&new_rate, &tbl_type);
1943                                 ant_toggle_count = 1;
1944                         }
1945                         repeat_cur_rate = IWL_NUMBER_TRY;
1946                 } else
1947                         repeat_cur_rate = IWL_HT_NUMBER_TRY;
1948
1949                 use_ht_possible = 0;
1950
1951                 lq_cmd->rs_table[index].rate_n_flags =
1952                                 cpu_to_le32(new_rate.rate_n_flags);
1953                 /* lq_cmd->rs_table[index].rate_n_flags = 0x800d; */
1954
1955                 index++;
1956                 repeat_cur_rate--;
1957         }
1958
1959         /* lq_cmd->rs_table[0].rate_n_flags = 0x800d; */
1960
1961         lq_cmd->general_params.dual_stream_ant_msk = 3;
1962         lq_cmd->agg_params.agg_dis_start_th = 3;
1963         lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
1964         return rc;
1965 }
1966
1967 static void *rs_alloc(struct ieee80211_local *local)
1968 {
1969         return local->hw.priv;
1970 }
1971 /* rate scale requires free function to be implemented */
1972 static void rs_free(void *priv_rate)
1973 {
1974         return;
1975 }
1976
1977 static void rs_clear(void *priv_rate)
1978 {
1979         struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
1980
1981         IWL_DEBUG_RATE("enter\n");
1982
1983         priv->lq_mngr.lq_ready = 0;
1984 #ifdef CONFIG_IWLWIFI_HT
1985 #ifdef CONFIG_IWLWIFI_HT_AGG
1986         if (priv->lq_mngr.agg_ctrl.granted_ba)
1987                 iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
1988 #endif /*CONFIG_IWLWIFI_HT_AGG */
1989 #endif /* CONFIG_IWLWIFI_HT */
1990
1991         IWL_DEBUG_RATE("leave\n");
1992 }
1993
1994 static void rs_free_sta(void *priv, void *priv_sta)
1995 {
1996         struct iwl_rate_scale_priv *rs_priv = priv_sta;
1997
1998         IWL_DEBUG_RATE("enter\n");
1999         kfree(rs_priv);
2000         IWL_DEBUG_RATE("leave\n");
2001 }
2002
2003
2004 #ifdef CONFIG_MAC80211_DEBUGFS
2005 static int open_file_generic(struct inode *inode, struct file *file)
2006 {
2007         file->private_data = inode->i_private;
2008         return 0;
2009 }
2010
2011 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2012                         char __user *user_buf, size_t count, loff_t *ppos)
2013 {
2014         char buff[1024];
2015         int desc = 0;
2016         int i = 0;
2017
2018         struct iwl_rate_scale_priv *rs_priv = file->private_data;
2019
2020         desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
2021         desc += sprintf(buff+desc, "failed=%d success=%d rate=%X\n",
2022                         rs_priv->total_failed, rs_priv->total_success,
2023                         rs_priv->active_rate);
2024         desc += sprintf(buff+desc, "general:"
2025                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2026                 rs_priv->lq.general_params.flags,
2027                 rs_priv->lq.general_params.mimo_delimiter,
2028                 rs_priv->lq.general_params.single_stream_ant_msk,
2029                 rs_priv->lq.general_params.dual_stream_ant_msk);
2030
2031         desc += sprintf(buff+desc, "agg:"
2032                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2033                         le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
2034                         rs_priv->lq.agg_params.agg_dis_start_th,
2035                         rs_priv->lq.agg_params.agg_frame_cnt_limit);
2036
2037         desc += sprintf(buff+desc,
2038                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2039                         rs_priv->lq.general_params.start_rate_index[0],
2040                         rs_priv->lq.general_params.start_rate_index[1],
2041                         rs_priv->lq.general_params.start_rate_index[2],
2042                         rs_priv->lq.general_params.start_rate_index[3]);
2043
2044
2045         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2046                 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2047                         i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));
2048
2049         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2050 }
2051
2052 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2053         .read = rs_sta_dbgfs_scale_table_read,
2054         .open = open_file_generic,
2055 };
2056
2057 static void rs_add_debugfs(void *priv, void *priv_sta,
2058                                         struct dentry *dir)
2059 {
2060         struct iwl_rate_scale_priv *rs_priv = priv_sta;
2061         rs_priv->rs_sta_dbgfs_scale_table_file =
2062                 debugfs_create_file("rate_scale_table", 0444, dir,
2063                                 rs_priv, &rs_sta_dbgfs_scale_table_ops);
2064 }
2065
2066 static void rs_remove_debugfs(void *priv, void *priv_sta)
2067 {
2068         struct iwl_rate_scale_priv *rs_priv = priv_sta;
2069         debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
2070 }
2071 #endif
2072
2073 static struct rate_control_ops rs_ops = {
2074         .module = NULL,
2075         .name = RS_NAME,
2076         .tx_status = rs_tx_status,
2077         .get_rate = rs_get_rate,
2078         .rate_init = rs_rate_init,
2079         .clear = rs_clear,
2080         .alloc = rs_alloc,
2081         .free = rs_free,
2082         .alloc_sta = rs_alloc_sta,
2083         .free_sta = rs_free_sta,
2084 #ifdef CONFIG_MAC80211_DEBUGFS
2085         .add_sta_debugfs = rs_add_debugfs,
2086         .remove_sta_debugfs = rs_remove_debugfs,
2087 #endif
2088 };
2089
2090 int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2091 {
2092         struct ieee80211_local *local = hw_to_local(hw);
2093         struct iwl_priv *priv = hw->priv;
2094         struct iwl_rate_scale_priv *rs_priv;
2095         struct sta_info *sta;
2096         int count = 0, i;
2097         u32 samples = 0, success = 0, good = 0;
2098         unsigned long now = jiffies;
2099         u32 max_time = 0;
2100         u8 lq_type, antenna;
2101
2102         sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2103         if (!sta || !sta->rate_ctrl_priv) {
2104                 if (sta) {
2105                         sta_info_put(sta);
2106                         IWL_DEBUG_RATE("leave - no private rate data!\n");
2107                 } else
2108                         IWL_DEBUG_RATE("leave - no station!\n");
2109                 return sprintf(buf, "station %d not found\n", sta_id);
2110         }
2111
2112         rs_priv = (void *)sta->rate_ctrl_priv;
2113
2114         lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
2115         antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
2116
2117         if (is_legacy(lq_type))
2118                 i = IWL_RATE_54M_INDEX;
2119         else
2120                 i = IWL_RATE_60M_INDEX;
2121         while (1) {
2122                 u64 mask;
2123                 int j;
2124                 int active = rs_priv->active_tbl;
2125
2126                 count +=
2127                     sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
2128
2129                 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2130                 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2131                         buf[count++] =
2132                                 (rs_priv->lq_info[active].win[i].data & mask)
2133                                 ? '1' : '0';
2134
2135                 samples += rs_priv->lq_info[active].win[i].counter;
2136                 good += rs_priv->lq_info[active].win[i].success_counter;
2137                 success += rs_priv->lq_info[active].win[i].success_counter *
2138                            iwl_rates[i].ieee;
2139
2140                 if (rs_priv->lq_info[active].win[i].stamp) {
2141                         int delta =
2142                                    jiffies_to_msecs(now -
2143                                    rs_priv->lq_info[active].win[i].stamp);
2144
2145                         if (delta > max_time)
2146                                 max_time = delta;
2147
2148                         count += sprintf(&buf[count], "%5dms\n", delta);
2149                 } else
2150                         buf[count++] = '\n';
2151
2152                 j = iwl_get_prev_ieee_rate(i);
2153                 if (j == i)
2154                         break;
2155                 i = j;
2156         }
2157
2158         /* Display the average rate of all samples taken.
2159          *
2160          * NOTE:  We multiple # of samples by 2 since the IEEE measurement
2161          * added from iwl_rates is actually 2X the rate */
2162         if (samples)
2163                 count += sprintf(&buf[count],
2164                          "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2165                          "%3d%% success (%d good packets over %d tries)\n",
2166                          success / (2 * samples), (success * 5 / samples) % 10,
2167                          max_time, good * 100 / samples, good, samples);
2168         else
2169                 count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
2170         count += sprintf(&buf[count], "\nrate scale type %d anntena %d "
2171                          "active_search %d rate index %d\n", lq_type, antenna,
2172                          rs_priv->search_better_tbl, sta->last_txrate);
2173
2174         sta_info_put(sta);
2175         return count;
2176 }
2177
2178 void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2179 {
2180         struct iwl_priv *priv = hw->priv;
2181
2182         priv->lq_mngr.lq_ready = 1;
2183 }
2184
2185 void iwl_rate_control_register(struct ieee80211_hw *hw)
2186 {
2187         ieee80211_rate_control_register(&rs_ops);
2188 }
2189
2190 void iwl_rate_control_unregister(struct ieee80211_hw *hw)
2191 {
2192         ieee80211_rate_control_unregister(&rs_ops);
2193 }
2194