drivers/net/wireless/iwlwifi/mvm/rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2013 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  *  Intel Linux Wireless <ilw@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/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  46 #define IWL_NUMBER_TRY      1
  47 #define IWL_HT_NUMBER_TRY   3
  48
  49 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  50 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  51 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  52
  53 /* max allowed rate miss before sync LQ cmd */
  54 #define IWL_MISSED_RATE_MAX             15
  55 /* max time to accum history 2 seconds */
  56 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  57
  58 static u8 rs_ht_to_legacy[] = {
  59         [IWL_RATE_1M_INDEX] = IWL_RATE_6M_INDEX,
  60         [IWL_RATE_2M_INDEX] = IWL_RATE_6M_INDEX,
  61         [IWL_RATE_5M_INDEX] = IWL_RATE_6M_INDEX,
  62         [IWL_RATE_11M_INDEX] = IWL_RATE_6M_INDEX,
  63         [IWL_RATE_6M_INDEX] = IWL_RATE_6M_INDEX,
  64         [IWL_RATE_9M_INDEX] = IWL_RATE_6M_INDEX,
  65         [IWL_RATE_12M_INDEX] = IWL_RATE_9M_INDEX,
  66         [IWL_RATE_18M_INDEX] = IWL_RATE_12M_INDEX,
  67         [IWL_RATE_24M_INDEX] = IWL_RATE_18M_INDEX,
  68         [IWL_RATE_36M_INDEX] = IWL_RATE_24M_INDEX,
  69         [IWL_RATE_48M_INDEX] = IWL_RATE_36M_INDEX,
  70         [IWL_RATE_54M_INDEX] = IWL_RATE_48M_INDEX,
  71         [IWL_RATE_60M_INDEX] = IWL_RATE_54M_INDEX,
  72 };
  73
  74 static const u8 ant_toggle_lookup[] = {
  75         [ANT_NONE] = ANT_NONE,
  76         [ANT_A] = ANT_B,
  77         [ANT_B] = ANT_C,
  78         [ANT_AB] = ANT_BC,
  79         [ANT_C] = ANT_A,
  80         [ANT_AC] = ANT_AB,
  81         [ANT_BC] = ANT_AC,
  82         [ANT_ABC] = ANT_ABC,
  83 };
  84
  85 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  86         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  87                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  88                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  89                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  90                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  91                                     IWL_RATE_##rp##M_INDEX,           \
  92                                     IWL_RATE_##rn##M_INDEX }
  93
  94 #define IWL_DECLARE_MCS_RATE(s)                                           \
  95         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  96                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  97                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  98                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  99                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
 100                                        IWL_RATE_INVM_INDEX,               \
 101                                        IWL_RATE_INVM_INDEX }
 102
 103 /*
 104  * Parameter order:
 105  *   rate, ht rate, prev rate, next rate
 106  *
 107  * If there isn't a valid next or previous rate then INV is used which
 108  * maps to IWL_RATE_INVALID
 109  *
 110  */
 111 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 112         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 113         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 114         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 115         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 116         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 117         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 118         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 119         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 120         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 121         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 122         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 123         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 124         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 125         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 126         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 127 };
 128
 129 static inline u8 rs_extract_rate(u32 rate_n_flags)
 130 {
 131         /* also works for HT because bits 7:6 are zero there */
 132         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 133 }
 134
 135 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 136 {
 137         int idx = 0;
 138
 139         if (rate_n_flags & RATE_MCS_HT_MSK) {
 140                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 141                 idx += IWL_RATE_MCS_0_INDEX;
 142
 143                 /* skip 9M not supported in HT*/
 144                 if (idx >= IWL_RATE_9M_INDEX)
 145                         idx += 1;
 146                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 147                         return idx;
 148         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 149                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 150                 idx += IWL_RATE_MCS_0_INDEX;
 151
 152                 /* skip 9M not supported in VHT*/
 153                 if (idx >= IWL_RATE_9M_INDEX)
 154                         idx++;
 155                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 156                         return idx;
 157         } else {
 158                 /* legacy rate format, search for match in table */
 159
 160                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 161                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 162                         if (iwl_rates[idx].plcp == legacy_rate)
 163                                 return idx;
 164         }
 165
 166         return -1;
 167 }
 168
 169 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 170                                    struct sk_buff *skb,
 171                                    struct ieee80211_sta *sta,
 172                                    struct iwl_lq_sta *lq_sta);
 173 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
 174                              struct ieee80211_sta *sta,
 175                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 176 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 177
 178
 179 #ifdef CONFIG_MAC80211_DEBUGFS
 180 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 181                              u32 *rate_n_flags);
 182 #else
 183 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 184                              u32 *rate_n_flags)
 185 {}
 186 #endif
 187
 188 /**
 189  * The following tables contain the expected throughput metrics for all rates
 190  *
 191  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 192  *
 193  * where invalid entries are zeros.
 194  *
 195  * CCK rates are only valid in legacy table and will only be used in G
 196  * (2.4 GHz) band.
 197  */
 198
 199 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 200         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 201 };
 202
 203 /* Expected TpT tables. 4 indexes:
 204  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 205  */
 206 static s32 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 207         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 208         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 209         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 210         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 211 };
 212
 213 static s32 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 214         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 215         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 216         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 217         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 218 };
 219
 220 static s32 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 221         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 222         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 223         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 224         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 225 };
 226
 227 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 228         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 229         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 230         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 231         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 232 };
 233
 234 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 235         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 236         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 237         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 238         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 239 };
 240
 241 static s32 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 242         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 243         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 244         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 245         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 246 };
 247
 248 /* mbps, mcs */
 249 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 250         {  "1", "BPSK DSSS"},
 251         {  "2", "QPSK DSSS"},
 252         {"5.5", "BPSK CCK"},
 253         { "11", "QPSK CCK"},
 254         {  "6", "BPSK 1/2"},
 255         {  "9", "BPSK 1/2"},
 256         { "12", "QPSK 1/2"},
 257         { "18", "QPSK 3/4"},
 258         { "24", "16QAM 1/2"},
 259         { "36", "16QAM 3/4"},
 260         { "48", "64QAM 2/3"},
 261         { "54", "64QAM 3/4"},
 262         { "60", "64QAM 5/6"},
 263 };
 264
 265 #define MCS_INDEX_PER_STREAM    (8)
 266
 267 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 268 {
 269         window->data = 0;
 270         window->success_counter = 0;
 271         window->success_ratio = IWL_INVALID_VALUE;
 272         window->counter = 0;
 273         window->average_tpt = IWL_INVALID_VALUE;
 274         window->stamp = 0;
 275 }
 276
 277 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 278 {
 279         return (ant_type & valid_antenna) == ant_type;
 280 }
 281
 282 #ifdef CONFIG_MAC80211_DEBUGFS
 283 /**
 284  * Program the device to use fixed rate for frame transmit
 285  * This is for debugging/testing only
 286  * once the device start use fixed rate, we need to reload the module
 287  * to being back the normal operation.
 288  */
 289 static void rs_program_fix_rate(struct iwl_mvm *mvm,
 290                                 struct iwl_lq_sta *lq_sta)
 291 {
 292         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 293         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 294         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 295
 296         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
 297                        lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 298
 299         if (lq_sta->dbg_fixed_rate) {
 300                 rs_fill_link_cmd(NULL, NULL, lq_sta, lq_sta->dbg_fixed_rate);
 301                 iwl_mvm_send_lq_cmd(lq_sta->drv, &lq_sta->lq, false);
 302         }
 303 }
 304 #endif
 305
 306 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 307                                       struct iwl_lq_sta *lq_data, u8 tid,
 308                                       struct ieee80211_sta *sta)
 309 {
 310         int ret = -EAGAIN;
 311
 312         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 313                      sta->addr, tid);
 314         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 315         if (ret == -EAGAIN) {
 316                 /*
 317                  * driver and mac80211 is out of sync
 318                  * this might be cause by reloading firmware
 319                  * stop the tx ba session here
 320                  */
 321                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 322                         tid);
 323                 ieee80211_stop_tx_ba_session(sta, tid);
 324         }
 325         return ret;
 326 }
 327
 328 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 329                               struct iwl_lq_sta *lq_data,
 330                               struct ieee80211_sta *sta)
 331 {
 332         if (tid < IWL_MAX_TID_COUNT)
 333                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 334         else
 335                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 336                         tid, IWL_MAX_TID_COUNT);
 337 }
 338
 339 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 340 {
 341         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 342                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 343                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 344 }
 345
 346 /*
 347  * Static function to get the expected throughput from an iwl_scale_tbl_info
 348  * that wraps a NULL pointer check
 349  */
 350 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 351 {
 352         if (tbl->expected_tpt)
 353                 return tbl->expected_tpt[rs_index];
 354         return 0;
 355 }
 356
 357 /**
 358  * rs_collect_tx_data - Update the success/failure sliding window
 359  *
 360  * We keep a sliding window of the last 62 packets transmitted
 361  * at this rate.  window->data contains the bitmask of successful
 362  * packets.
 363  */
 364 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 365                               int scale_index, int attempts, int successes)
 366 {
 367         struct iwl_rate_scale_data *window = NULL;
 368         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 369         s32 fail_count, tpt;
 370
 371         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 372                 return -EINVAL;
 373
 374         /* Select window for current tx bit rate */
 375         window = &(tbl->win[scale_index]);
 376
 377         /* Get expected throughput */
 378         tpt = get_expected_tpt(tbl, scale_index);
 379
 380         /*
 381          * Keep track of only the latest 62 tx frame attempts in this rate's
 382          * history window; anything older isn't really relevant any more.
 383          * If we have filled up the sliding window, drop the oldest attempt;
 384          * if the oldest attempt (highest bit in bitmap) shows "success",
 385          * subtract "1" from the success counter (this is the main reason
 386          * we keep these bitmaps!).
 387          */
 388         while (attempts > 0) {
 389                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 390                         /* remove earliest */
 391                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 392
 393                         if (window->data & mask) {
 394                                 window->data &= ~mask;
 395                                 window->success_counter--;
 396                         }
 397                 }
 398
 399                 /* Increment frames-attempted counter */
 400                 window->counter++;
 401
 402                 /* Shift bitmap by one frame to throw away oldest history */
 403                 window->data <<= 1;
 404
 405                 /* Mark the most recent #successes attempts as successful */
 406                 if (successes > 0) {
 407                         window->success_counter++;
 408                         window->data |= 0x1;
 409                         successes--;
 410                 }
 411
 412                 attempts--;
 413         }
 414
 415         /* Calculate current success ratio, avoid divide-by-0! */
 416         if (window->counter > 0)
 417                 window->success_ratio = 128 * (100 * window->success_counter)
 418                                         / window->counter;
 419         else
 420                 window->success_ratio = IWL_INVALID_VALUE;
 421
 422         fail_count = window->counter - window->success_counter;
 423
 424         /* Calculate average throughput, if we have enough history. */
 425         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 426             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 427                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 428         else
 429                 window->average_tpt = IWL_INVALID_VALUE;
 430
 431         /* Tag this window as having been updated */
 432         window->stamp = jiffies;
 433
 434         return 0;
 435 }
 436
 437 /*
 438  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 439  */
 440 /* FIXME:RS:remove this function and put the flags statically in the table */
 441 static u32 rate_n_flags_from_tbl(struct iwl_mvm *mvm,
 442                                  struct iwl_scale_tbl_info *tbl, int index)
 443 {
 444         u32 rate_n_flags = 0;
 445
 446         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 447                          RATE_MCS_ANT_ABC_MSK);
 448
 449         if (is_legacy(tbl->lq_type)) {
 450                 rate_n_flags |= iwl_rates[index].plcp;
 451                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 452                         rate_n_flags |= RATE_MCS_CCK_MSK;
 453                 return rate_n_flags;
 454         }
 455
 456         if (is_ht(tbl->lq_type)) {
 457                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 458                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 459                         index = IWL_LAST_HT_RATE;
 460                 }
 461                 rate_n_flags |= RATE_MCS_HT_MSK;
 462
 463                 if (is_ht_siso(tbl->lq_type))
 464                         rate_n_flags |= iwl_rates[index].plcp_ht_siso;
 465                 else if (is_ht_mimo2(tbl->lq_type))
 466                         rate_n_flags |= iwl_rates[index].plcp_ht_mimo2;
 467                 else
 468                         WARN_ON_ONCE(1);
 469         } else if (is_vht(tbl->lq_type)) {
 470                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 471                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 472                         index = IWL_LAST_VHT_RATE;
 473                 }
 474                 rate_n_flags |= RATE_MCS_VHT_MSK;
 475                 if (is_vht_siso(tbl->lq_type))
 476                         rate_n_flags |= iwl_rates[index].plcp_vht_siso;
 477                 else if (is_vht_mimo2(tbl->lq_type))
 478                         rate_n_flags |= iwl_rates[index].plcp_vht_mimo2;
 479                 else
 480                         WARN_ON_ONCE(1);
 481
 482         } else {
 483                 IWL_ERR(mvm, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 484         }
 485
 486         rate_n_flags |= tbl->bw;
 487         if (tbl->is_SGI)
 488                 rate_n_flags |= RATE_MCS_SGI_MSK;
 489
 490         return rate_n_flags;
 491 }
 492
 493 /*
 494  * Interpret uCode API's rate_n_flags format,
 495  * fill "search" or "active" tx mode table.
 496  */
 497 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 498                                     enum ieee80211_band band,
 499                                     struct iwl_scale_tbl_info *tbl,
 500                                     int *rate_idx)
 501 {
 502         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 503         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 504         u8 nss;
 505
 506         memset(tbl, 0, offsetof(struct iwl_scale_tbl_info, win));
 507         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 508
 509         if (*rate_idx  == IWL_RATE_INVALID) {
 510                 *rate_idx = -1;
 511                 return -EINVAL;
 512         }
 513         tbl->is_SGI = 0;        /* default legacy setup */
 514         tbl->bw = 0;
 515         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 516         tbl->lq_type = LQ_NONE;
 517         tbl->max_search = IWL_MAX_SEARCH;
 518
 519         /* Legacy */
 520         if (!(rate_n_flags & RATE_MCS_HT_MSK) &&
 521             !(rate_n_flags & RATE_MCS_VHT_MSK)) {
 522                 if (num_of_ant == 1) {
 523                         if (band == IEEE80211_BAND_5GHZ)
 524                                 tbl->lq_type = LQ_LEGACY_A;
 525                         else
 526                                 tbl->lq_type = LQ_LEGACY_G;
 527                 }
 528
 529                 return 0;
 530         }
 531
 532         /* HT or VHT */
 533         if (rate_n_flags & RATE_MCS_SGI_MSK)
 534                 tbl->is_SGI = 1;
 535
 536         tbl->bw = rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK;
 537
 538         if (rate_n_flags & RATE_MCS_HT_MSK) {
 539                 nss = ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
 540                        RATE_HT_MCS_NSS_POS) + 1;
 541
 542                 if (nss == 1) {
 543                         tbl->lq_type = LQ_HT_SISO;
 544                         WARN_ON_ONCE(num_of_ant != 1);
 545                 } else if (nss == 2) {
 546                         tbl->lq_type = LQ_HT_MIMO2;
 547                         WARN_ON_ONCE(num_of_ant != 2);
 548                 } else {
 549                         WARN_ON_ONCE(1);
 550                 }
 551         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 552                 nss = ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
 553                        RATE_VHT_MCS_NSS_POS) + 1;
 554
 555                 if (nss == 1) {
 556                         tbl->lq_type = LQ_VHT_SISO;
 557                         WARN_ON_ONCE(num_of_ant != 1);
 558                 } else if (nss == 2) {
 559                         tbl->lq_type = LQ_VHT_MIMO2;
 560                         WARN_ON_ONCE(num_of_ant != 2);
 561                 } else {
 562                         WARN_ON_ONCE(1);
 563                 }
 564         }
 565
 566         WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_160);
 567         WARN_ON_ONCE(tbl->bw == RATE_MCS_CHAN_WIDTH_80 &&
 568                      !is_vht(tbl->lq_type));
 569
 570         return 0;
 571 }
 572
 573 /* switch to another antenna/antennas and return 1 */
 574 /* if no other valid antenna found, return 0 */
 575 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 576                              struct iwl_scale_tbl_info *tbl)
 577 {
 578         u8 new_ant_type;
 579
 580         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 581                 return 0;
 582
 583         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 584                 return 0;
 585
 586         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 587
 588         while ((new_ant_type != tbl->ant_type) &&
 589                !rs_is_valid_ant(valid_ant, new_ant_type))
 590                 new_ant_type = ant_toggle_lookup[new_ant_type];
 591
 592         if (new_ant_type == tbl->ant_type)
 593                 return 0;
 594
 595         tbl->ant_type = new_ant_type;
 596         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 597         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 598         return 1;
 599 }
 600
 601 /**
 602  * rs_get_supported_rates - get the available rates
 603  *
 604  * if management frame or broadcast frame only return
 605  * basic available rates.
 606  *
 607  */
 608 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 609                                   struct ieee80211_hdr *hdr,
 610                                   enum iwl_table_type rate_type)
 611 {
 612         if (is_legacy(rate_type))
 613                 return lq_sta->active_legacy_rate;
 614         else if (is_siso(rate_type))
 615                 return lq_sta->active_siso_rate;
 616         else if (is_mimo2(rate_type))
 617                 return lq_sta->active_mimo2_rate;
 618
 619         WARN_ON_ONCE(1);
 620         return 0;
 621 }
 622
 623 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 624                                 int rate_type)
 625 {
 626         u8 high = IWL_RATE_INVALID;
 627         u8 low = IWL_RATE_INVALID;
 628
 629         /* 802.11A or ht walks to the next literal adjacent rate in
 630          * the rate table */
 631         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 632                 int i;
 633                 u32 mask;
 634
 635                 /* Find the previous rate that is in the rate mask */
 636                 i = index - 1;
 637                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 638                         if (rate_mask & mask) {
 639                                 low = i;
 640                                 break;
 641                         }
 642                 }
 643
 644                 /* Find the next rate that is in the rate mask */
 645                 i = index + 1;
 646                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 647                         if (rate_mask & mask) {
 648                                 high = i;
 649                                 break;
 650                         }
 651                 }
 652
 653                 return (high << 8) | low;
 654         }
 655
 656         low = index;
 657         while (low != IWL_RATE_INVALID) {
 658                 low = iwl_rates[low].prev_rs;
 659                 if (low == IWL_RATE_INVALID)
 660                         break;
 661                 if (rate_mask & (1 << low))
 662                         break;
 663                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 664         }
 665
 666         high = index;
 667         while (high != IWL_RATE_INVALID) {
 668                 high = iwl_rates[high].next_rs;
 669                 if (high == IWL_RATE_INVALID)
 670                         break;
 671                 if (rate_mask & (1 << high))
 672                         break;
 673                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 674         }
 675
 676         return (high << 8) | low;
 677 }
 678
 679 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 680                              struct iwl_scale_tbl_info *tbl,
 681                              u8 scale_index, u8 ht_possible)
 682 {
 683         s32 low;
 684         u16 rate_mask;
 685         u16 high_low;
 686         u8 switch_to_legacy = 0;
 687         struct iwl_mvm *mvm = lq_sta->drv;
 688
 689         /* check if we need to switch from HT to legacy rates.
 690          * assumption is that mandatory rates (1Mbps or 6Mbps)
 691          * are always supported (spec demand) */
 692         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 693                 switch_to_legacy = 1;
 694                 scale_index = rs_ht_to_legacy[scale_index];
 695                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 696                         tbl->lq_type = LQ_LEGACY_A;
 697                 else
 698                         tbl->lq_type = LQ_LEGACY_G;
 699
 700                 if (num_of_ant(tbl->ant_type) > 1)
 701                         tbl->ant_type =
 702                             first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
 703
 704                 tbl->bw = 0;
 705                 tbl->is_SGI = 0;
 706                 tbl->max_search = IWL_MAX_SEARCH;
 707         }
 708
 709         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 710
 711         /* Mask with station rate restriction */
 712         if (is_legacy(tbl->lq_type)) {
 713                 /* supp_rates has no CCK bits in A mode */
 714                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 715                         rate_mask  = (u16)(rate_mask &
 716                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 717                 else
 718                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 719         }
 720
 721         /* If we switched from HT to legacy, check current rate */
 722         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 723                 low = scale_index;
 724                 goto out;
 725         }
 726
 727         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 728                                         tbl->lq_type);
 729         low = high_low & 0xff;
 730
 731         if (low == IWL_RATE_INVALID)
 732                 low = scale_index;
 733
 734 out:
 735         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low);
 736 }
 737
 738 /*
 739  * Simple function to compare two rate scale table types
 740  */
 741 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 742                                struct iwl_scale_tbl_info *b)
 743 {
 744         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 745                 (a->is_SGI == b->is_SGI);
 746 }
 747
 748 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
 749 {
 750         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 751                 return RATE_MCS_CHAN_WIDTH_40;
 752         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 753                 return RATE_MCS_CHAN_WIDTH_80;
 754         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 755                 return RATE_MCS_CHAN_WIDTH_160;
 756
 757         return RATE_MCS_CHAN_WIDTH_20;
 758 }
 759
 760 /*
 761  * mac80211 sends us Tx status
 762  */
 763 static void rs_tx_status(void *mvm_r, struct ieee80211_supported_band *sband,
 764                          struct ieee80211_sta *sta, void *priv_sta,
 765                          struct sk_buff *skb)
 766 {
 767         int legacy_success;
 768         int retries;
 769         int rs_index, mac_index, i;
 770         struct iwl_lq_sta *lq_sta = priv_sta;
 771         struct iwl_lq_cmd *table;
 772         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 773         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
 774         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
 775         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 776         enum mac80211_rate_control_flags mac_flags;
 777         u32 tx_rate;
 778         struct iwl_scale_tbl_info tbl_type;
 779         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 780
 781         IWL_DEBUG_RATE_LIMIT(mvm,
 782                              "get frame ack response, update rate scale window\n");
 783
 784         /* Treat uninitialized rate scaling data same as non-existing. */
 785         if (!lq_sta) {
 786                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
 787                 return;
 788         } else if (!lq_sta->drv) {
 789                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
 790                 return;
 791         }
 792
 793         if (!ieee80211_is_data(hdr->frame_control) ||
 794             info->flags & IEEE80211_TX_CTL_NO_ACK)
 795                 return;
 796
 797         /* This packet was aggregated but doesn't carry status info */
 798         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 799             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 800                 return;
 801
 802         /*
 803          * Ignore this Tx frame response if its initial rate doesn't match
 804          * that of latest Link Quality command.  There may be stragglers
 805          * from a previous Link Quality command, but we're no longer interested
 806          * in those; they're either from the "active" mode while we're trying
 807          * to check "search" mode, or a prior "search" mode after we've moved
 808          * to a new "search" mode (which might become the new "active" mode).
 809          */
 810         table = &lq_sta->lq;
 811         tx_rate = le32_to_cpu(table->rs_table[0]);
 812         rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type, &rs_index);
 813         if (info->band == IEEE80211_BAND_5GHZ)
 814                 rs_index -= IWL_FIRST_OFDM_RATE;
 815         mac_flags = info->status.rates[0].flags;
 816         mac_index = info->status.rates[0].idx;
 817         /* For HT packets, map MCS to PLCP */
 818         if (mac_flags & IEEE80211_TX_RC_MCS) {
 819                 /* Remove # of streams */
 820                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
 821                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 822                         mac_index++;
 823                 /*
 824                  * mac80211 HT index is always zero-indexed; we need to move
 825                  * HT OFDM rates after CCK rates in 2.4 GHz band
 826                  */
 827                 if (info->band == IEEE80211_BAND_2GHZ)
 828                         mac_index += IWL_FIRST_OFDM_RATE;
 829         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
 830                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
 831                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 832                         mac_index++;
 833         }
 834
 835         /* Here we actually compare this rate to the latest LQ command */
 836         if ((mac_index < 0) ||
 837             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 838             (tbl_type.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
 839             (tbl_type.ant_type != info->status.antenna) ||
 840             (!!(tx_rate & RATE_MCS_HT_MSK) !=
 841              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 842             (!!(tx_rate & RATE_MCS_VHT_MSK) !=
 843              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
 844             (!!(tx_rate & RATE_HT_MCS_GF_MSK) !=
 845              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 846             (rs_index != mac_index)) {
 847                 IWL_DEBUG_RATE(mvm,
 848                                "initial rate %d does not match %d (0x%x)\n",
 849                                mac_index, rs_index, tx_rate);
 850                 /*
 851                  * Since rates mis-match, the last LQ command may have failed.
 852                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 853                  * ... driver.
 854                  */
 855                 lq_sta->missed_rate_counter++;
 856                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 857                         lq_sta->missed_rate_counter = 0;
 858                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
 859                 }
 860                 /* Regardless, ignore this status info for outdated rate */
 861                 return;
 862         } else
 863                 /* Rate did match, so reset the missed_rate_counter */
 864                 lq_sta->missed_rate_counter = 0;
 865
 866         /* Figure out if rate scale algorithm is in active or search table */
 867         if (table_type_matches(&tbl_type,
 868                                &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 869                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 870                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 871         } else if (table_type_matches(
 872                         &tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
 873                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 874                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 875         } else {
 876                 IWL_DEBUG_RATE(mvm,
 877                                "Neither active nor search matches tx rate\n");
 878                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 879                 IWL_DEBUG_RATE(mvm, "active- lq:%x, ant:%x, SGI:%d\n",
 880                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 881                                tmp_tbl->is_SGI);
 882                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
 883                 IWL_DEBUG_RATE(mvm, "search- lq:%x, ant:%x, SGI:%d\n",
 884                                tmp_tbl->lq_type, tmp_tbl->ant_type,
 885                                tmp_tbl->is_SGI);
 886                 IWL_DEBUG_RATE(mvm, "actual- lq:%x, ant:%x, SGI:%d\n",
 887                                tbl_type.lq_type, tbl_type.ant_type,
 888                                tbl_type.is_SGI);
 889                 /*
 890                  * no matching table found, let's by-pass the data collection
 891                  * and continue to perform rate scale to find the rate table
 892                  */
 893                 rs_stay_in_table(lq_sta, true);
 894                 goto done;
 895         }
 896
 897         /*
 898          * Updating the frame history depends on whether packets were
 899          * aggregated.
 900          *
 901          * For aggregation, all packets were transmitted at the same rate, the
 902          * first index into rate scale table.
 903          */
 904         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
 905                 tx_rate = le32_to_cpu(table->rs_table[0]);
 906                 rs_get_tbl_info_from_mcs(tx_rate, info->band, &tbl_type,
 907                                          &rs_index);
 908                 rs_collect_tx_data(curr_tbl, rs_index,
 909                                    info->status.ampdu_len,
 910                                    info->status.ampdu_ack_len);
 911
 912                 /* Update success/fail counts if not searching for new mode */
 913                 if (lq_sta->stay_in_tbl) {
 914                         lq_sta->total_success += info->status.ampdu_ack_len;
 915                         lq_sta->total_failed += (info->status.ampdu_len -
 916                                         info->status.ampdu_ack_len);
 917                 }
 918         } else {
 919         /*
 920          * For legacy, update frame history with for each Tx retry.
 921          */
 922                 retries = info->status.rates[0].count - 1;
 923                 /* HW doesn't send more than 15 retries */
 924                 retries = min(retries, 15);
 925
 926                 /* The last transmission may have been successful */
 927                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
 928                 /* Collect data for each rate used during failed TX attempts */
 929                 for (i = 0; i <= retries; ++i) {
 930                         tx_rate = le32_to_cpu(table->rs_table[i]);
 931                         rs_get_tbl_info_from_mcs(tx_rate, info->band,
 932                                                  &tbl_type, &rs_index);
 933                         /*
 934                          * Only collect stats if retried rate is in the same RS
 935                          * table as active/search.
 936                          */
 937                         if (table_type_matches(&tbl_type, curr_tbl))
 938                                 tmp_tbl = curr_tbl;
 939                         else if (table_type_matches(&tbl_type, other_tbl))
 940                                 tmp_tbl = other_tbl;
 941                         else
 942                                 continue;
 943                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
 944                                            i < retries ? 0 : legacy_success);
 945                 }
 946
 947                 /* Update success/fail counts if not searching for new mode */
 948                 if (lq_sta->stay_in_tbl) {
 949                         lq_sta->total_success += legacy_success;
 950                         lq_sta->total_failed += retries + (1 - legacy_success);
 951                 }
 952         }
 953         /* The last TX rate is cached in lq_sta; it's set in if/else above */
 954         lq_sta->last_rate_n_flags = tx_rate;
 955 done:
 956         /* See if there's a better rate or modulation mode to try. */
 957         if (sta && sta->supp_rates[sband->band])
 958                 rs_rate_scale_perform(mvm, skb, sta, lq_sta);
 959 }
 960
 961 /*
 962  * Begin a period of staying with a selected modulation mode.
 963  * Set "stay_in_tbl" flag to prevent any mode switches.
 964  * Set frame tx success limits according to legacy vs. high-throughput,
 965  * and reset overall (spanning all rates) tx success history statistics.
 966  * These control how long we stay using same modulation mode before
 967  * searching for a new mode.
 968  */
 969 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
 970                                  struct iwl_lq_sta *lq_sta)
 971 {
 972         IWL_DEBUG_RATE(mvm, "we are staying in the same table\n");
 973         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
 974         if (is_legacy) {
 975                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
 976                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
 977                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
 978         } else {
 979                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
 980                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
 981                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
 982         }
 983         lq_sta->table_count = 0;
 984         lq_sta->total_failed = 0;
 985         lq_sta->total_success = 0;
 986         lq_sta->flush_timer = jiffies;
 987         lq_sta->action_counter = 0;
 988 }
 989
 990 /*
 991  * Find correct throughput table for given mode of modulation
 992  */
 993 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
 994                                       struct iwl_scale_tbl_info *tbl)
 995 {
 996         /* Used to choose among HT tables */
 997         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
 998
 999         /* Check for invalid LQ type */
1000         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_ht(tbl->lq_type) &&
1001                          !(is_vht(tbl->lq_type)))) {
1002                 tbl->expected_tpt = expected_tpt_legacy;
1003                 return;
1004         }
1005
1006         /* Legacy rates have only one table */
1007         if (is_legacy(tbl->lq_type)) {
1008                 tbl->expected_tpt = expected_tpt_legacy;
1009                 return;
1010         }
1011
1012         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1013         /* Choose among many HT tables depending on number of streams
1014          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1015          * status */
1016         if (is_siso(tbl->lq_type)) {
1017                 switch (tbl->bw) {
1018                 case RATE_MCS_CHAN_WIDTH_20:
1019                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1020                         break;
1021                 case RATE_MCS_CHAN_WIDTH_40:
1022                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1023                         break;
1024                 case RATE_MCS_CHAN_WIDTH_80:
1025                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1026                         break;
1027                 default:
1028                         WARN_ON_ONCE(1);
1029                 }
1030         } else if (is_mimo2(tbl->lq_type)) {
1031                 switch (tbl->bw) {
1032                 case RATE_MCS_CHAN_WIDTH_20:
1033                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1034                         break;
1035                 case RATE_MCS_CHAN_WIDTH_40:
1036                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1037                         break;
1038                 case RATE_MCS_CHAN_WIDTH_80:
1039                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1040                         break;
1041                 default:
1042                         WARN_ON_ONCE(1);
1043                 }
1044         } else {
1045                 WARN_ON_ONCE(1);
1046         }
1047
1048         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1049                 tbl->expected_tpt = ht_tbl_pointer[0];
1050         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1051                 tbl->expected_tpt = ht_tbl_pointer[1];
1052         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1053                 tbl->expected_tpt = ht_tbl_pointer[2];
1054         else                                            /* AGG+SGI */
1055                 tbl->expected_tpt = ht_tbl_pointer[3];
1056 }
1057
1058 /*
1059  * Find starting rate for new "search" high-throughput mode of modulation.
1060  * Goal is to find lowest expected rate (under perfect conditions) that is
1061  * above the current measured throughput of "active" mode, to give new mode
1062  * a fair chance to prove itself without too many challenges.
1063  *
1064  * This gets called when transitioning to more aggressive modulation
1065  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1066  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1067  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1068  * bit rate will typically need to increase, but not if performance was bad.
1069  */
1070 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1071                             struct iwl_lq_sta *lq_sta,
1072                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1073                             u16 rate_mask, s8 index)
1074 {
1075         /* "active" values */
1076         struct iwl_scale_tbl_info *active_tbl =
1077             &(lq_sta->lq_info[lq_sta->active_tbl]);
1078         s32 active_sr = active_tbl->win[index].success_ratio;
1079         s32 active_tpt = active_tbl->expected_tpt[index];
1080
1081         /* expected "search" throughput */
1082         s32 *tpt_tbl = tbl->expected_tpt;
1083
1084         s32 new_rate, high, low, start_hi;
1085         u16 high_low;
1086         s8 rate = index;
1087
1088         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1089
1090         while (1) {
1091                 high_low = rs_get_adjacent_rate(mvm, rate, rate_mask,
1092                                                 tbl->lq_type);
1093
1094                 low = high_low & 0xff;
1095                 high = (high_low >> 8) & 0xff;
1096
1097                 /*
1098                  * Lower the "search" bit rate, to give new "search" mode
1099                  * approximately the same throughput as "active" if:
1100                  *
1101                  * 1) "Active" mode has been working modestly well (but not
1102                  *    great), and expected "search" throughput (under perfect
1103                  *    conditions) at candidate rate is above the actual
1104                  *    measured "active" throughput (but less than expected
1105                  *    "active" throughput under perfect conditions).
1106                  * OR
1107                  * 2) "Active" mode has been working perfectly or very well
1108                  *    and expected "search" throughput (under perfect
1109                  *    conditions) at candidate rate is above expected
1110                  *    "active" throughput (under perfect conditions).
1111                  */
1112                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1113                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1114                       (active_sr <= IWL_RATE_HIGH_TH) &&
1115                       (tpt_tbl[rate] <= active_tpt))) ||
1116                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1117                      (tpt_tbl[rate] > active_tpt))) {
1118                         /* (2nd or later pass)
1119                          * If we've already tried to raise the rate, and are
1120                          * now trying to lower it, use the higher rate. */
1121                         if (start_hi != IWL_RATE_INVALID) {
1122                                 new_rate = start_hi;
1123                                 break;
1124                         }
1125
1126                         new_rate = rate;
1127
1128                         /* Loop again with lower rate */
1129                         if (low != IWL_RATE_INVALID)
1130                                 rate = low;
1131
1132                         /* Lower rate not available, use the original */
1133                         else
1134                                 break;
1135
1136                 /* Else try to raise the "search" rate to match "active" */
1137                 } else {
1138                         /* (2nd or later pass)
1139                          * If we've already tried to lower the rate, and are
1140                          * now trying to raise it, use the lower rate. */
1141                         if (new_rate != IWL_RATE_INVALID)
1142                                 break;
1143
1144                         /* Loop again with higher rate */
1145                         else if (high != IWL_RATE_INVALID) {
1146                                 start_hi = high;
1147                                 rate = high;
1148
1149                         /* Higher rate not available, use the original */
1150                         } else {
1151                                 new_rate = rate;
1152                                 break;
1153                         }
1154                 }
1155         }
1156
1157         return new_rate;
1158 }
1159
1160 /* Move to the next action and wrap around to the first action in case
1161  * we're at the last action. Assumes actions start at 0.
1162  */
1163 static inline void rs_move_next_action(struct iwl_scale_tbl_info *tbl,
1164                                        u8 last_action)
1165 {
1166         BUILD_BUG_ON(IWL_LEGACY_FIRST_ACTION != 0);
1167         BUILD_BUG_ON(IWL_SISO_FIRST_ACTION != 0);
1168         BUILD_BUG_ON(IWL_MIMO2_FIRST_ACTION != 0);
1169
1170         tbl->action = (tbl->action + 1) % (last_action + 1);
1171 }
1172
1173 static void rs_set_bw_from_sta(struct iwl_scale_tbl_info *tbl,
1174                                struct ieee80211_sta *sta)
1175 {
1176         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1177                 tbl->bw = RATE_MCS_CHAN_WIDTH_80;
1178         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1179                 tbl->bw = RATE_MCS_CHAN_WIDTH_40;
1180         else
1181                 tbl->bw = RATE_MCS_CHAN_WIDTH_20;
1182 }
1183
1184 static bool rs_sgi_allowed(struct iwl_scale_tbl_info *tbl,
1185                            struct ieee80211_sta *sta)
1186 {
1187         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1188         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
1189
1190         if (is_ht20(tbl) && (ht_cap->cap &
1191                              IEEE80211_HT_CAP_SGI_20))
1192                 return true;
1193         if (is_ht40(tbl) && (ht_cap->cap &
1194                              IEEE80211_HT_CAP_SGI_40))
1195                 return true;
1196         if (is_ht80(tbl) && (vht_cap->cap &
1197                              IEEE80211_VHT_CAP_SHORT_GI_80))
1198                 return true;
1199
1200         return false;
1201 }
1202
1203 /*
1204  * Set up search table for MIMO2
1205  */
1206 static int rs_switch_to_mimo2(struct iwl_mvm *mvm,
1207                              struct iwl_lq_sta *lq_sta,
1208                              struct ieee80211_sta *sta,
1209                              struct iwl_scale_tbl_info *tbl, int index)
1210 {
1211         u16 rate_mask;
1212         s32 rate;
1213
1214         if (!sta->ht_cap.ht_supported)
1215                 return -1;
1216
1217         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
1218                 return -1;
1219
1220         /* Need both Tx chains/antennas to support MIMO */
1221         if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) < 2)
1222                 return -1;
1223
1224         IWL_DEBUG_RATE(mvm, "LQ: try to switch to MIMO2\n");
1225
1226         tbl->lq_type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1227         tbl->action = 0;
1228         tbl->max_search = IWL_MAX_SEARCH;
1229         rate_mask = lq_sta->active_mimo2_rate;
1230
1231         rs_set_bw_from_sta(tbl, sta);
1232         rs_set_expected_tpt_table(lq_sta, tbl);
1233
1234         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1235
1236         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 best rate %d mask %X\n",
1237                        rate, rate_mask);
1238         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1239                 IWL_DEBUG_RATE(mvm, "Can't switch with index %d rate mask %x\n",
1240                                rate, rate_mask);
1241                 return -1;
1242         }
1243         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1244
1245         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1246                        tbl->current_rate);
1247         return 0;
1248 }
1249
1250 /*
1251  * Set up search table for SISO
1252  */
1253 static int rs_switch_to_siso(struct iwl_mvm *mvm,
1254                              struct iwl_lq_sta *lq_sta,
1255                              struct ieee80211_sta *sta,
1256                              struct iwl_scale_tbl_info *tbl, int index)
1257 {
1258         u16 rate_mask;
1259         s32 rate;
1260
1261         if (!sta->ht_cap.ht_supported)
1262                 return -1;
1263
1264         IWL_DEBUG_RATE(mvm, "LQ: try to switch to SISO\n");
1265
1266         tbl->lq_type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1267         tbl->action = 0;
1268         tbl->max_search = IWL_MAX_SEARCH;
1269         rate_mask = lq_sta->active_siso_rate;
1270
1271         rs_set_bw_from_sta(tbl, sta);
1272         rs_set_expected_tpt_table(lq_sta, tbl);
1273         rate = rs_get_best_rate(mvm, lq_sta, tbl, rate_mask, index);
1274
1275         IWL_DEBUG_RATE(mvm, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1276         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1277                 IWL_DEBUG_RATE(mvm,
1278                                "can not switch with index %d rate mask %x\n",
1279                                rate, rate_mask);
1280                 return -1;
1281         }
1282         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, rate);
1283         IWL_DEBUG_RATE(mvm, "LQ: Switch to new mcs %X index\n",
1284                        tbl->current_rate);
1285         return 0;
1286 }
1287
1288 /*
1289  * Try to switch to new modulation mode from legacy
1290  */
1291 static int rs_move_legacy_other(struct iwl_mvm *mvm,
1292                                 struct iwl_lq_sta *lq_sta,
1293                                 struct ieee80211_sta *sta,
1294                                 int index)
1295 {
1296         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1297         struct iwl_scale_tbl_info *search_tbl =
1298                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1299         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1300         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1301                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1302         u8 start_action;
1303         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1304         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1305         int ret;
1306         u8 update_search_tbl_counter = 0;
1307
1308         start_action = tbl->action;
1309         while (1) {
1310                 lq_sta->action_counter++;
1311                 switch (tbl->action) {
1312                 case IWL_LEGACY_SWITCH_ANTENNA:
1313                         IWL_DEBUG_RATE(mvm, "LQ: Legacy toggle Antenna\n");
1314
1315                         if (tx_chains_num <= 1)
1316                                 break;
1317
1318                         /* Don't change antenna if success has been great */
1319                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1320                                 break;
1321
1322                         /* Set up search table to try other antenna */
1323                         memcpy(search_tbl, tbl, sz);
1324
1325                         if (rs_toggle_antenna(valid_tx_ant,
1326                                               &search_tbl->current_rate,
1327                                               search_tbl)) {
1328                                 update_search_tbl_counter = 1;
1329                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1330                                 goto out;
1331                         }
1332                         break;
1333                 case IWL_LEGACY_SWITCH_SISO:
1334                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to SISO\n");
1335
1336                         /* Set up search table to try SISO */
1337                         memcpy(search_tbl, tbl, sz);
1338                         search_tbl->is_SGI = 0;
1339                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1340                                                  search_tbl, index);
1341                         if (!ret) {
1342                                 lq_sta->action_counter = 0;
1343                                 goto out;
1344                         }
1345
1346                         break;
1347                 case IWL_LEGACY_SWITCH_MIMO2:
1348                         IWL_DEBUG_RATE(mvm, "LQ: Legacy switch to MIMO2\n");
1349
1350                         /* Set up search table to try MIMO */
1351                         memcpy(search_tbl, tbl, sz);
1352                         search_tbl->is_SGI = 0;
1353
1354                         search_tbl->ant_type = ANT_AB;
1355
1356                         if (!rs_is_valid_ant(valid_tx_ant,
1357                                              search_tbl->ant_type))
1358                                 break;
1359
1360                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1361                                                  search_tbl, index);
1362                         if (!ret) {
1363                                 lq_sta->action_counter = 0;
1364                                 goto out;
1365                         }
1366                         break;
1367                 default:
1368                         WARN_ON_ONCE(1);
1369                 }
1370                 rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1371
1372                 if (tbl->action == start_action)
1373                         break;
1374         }
1375         search_tbl->lq_type = LQ_NONE;
1376         return 0;
1377
1378 out:
1379         lq_sta->search_better_tbl = 1;
1380         rs_move_next_action(tbl, IWL_LEGACY_LAST_ACTION);
1381         if (update_search_tbl_counter)
1382                 search_tbl->action = tbl->action;
1383         return 0;
1384 }
1385
1386 /*
1387  * Try to switch to new modulation mode from SISO
1388  */
1389 static int rs_move_siso_to_other(struct iwl_mvm *mvm,
1390                                  struct iwl_lq_sta *lq_sta,
1391                                  struct ieee80211_sta *sta, int index)
1392 {
1393         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1394         struct iwl_scale_tbl_info *search_tbl =
1395                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1396         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1397         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1398                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1399         u8 start_action;
1400         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1401         u8 tx_chains_num = num_of_ant(valid_tx_ant);
1402         u8 update_search_tbl_counter = 0;
1403         int ret;
1404
1405         if (tbl->action == IWL_SISO_SWITCH_MIMO2 &&
1406             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1407                 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1408
1409         start_action = tbl->action;
1410         while (1) {
1411                 lq_sta->action_counter++;
1412                 switch (tbl->action) {
1413                 case IWL_SISO_SWITCH_ANTENNA:
1414                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle Antenna\n");
1415                         if (tx_chains_num <= 1)
1416                                 break;
1417
1418                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1419                             BT_MBOX_MSG(&mvm->last_bt_notif, 3,
1420                                         TRAFFIC_LOAD) == 0)
1421                                 break;
1422
1423                         memcpy(search_tbl, tbl, sz);
1424                         if (rs_toggle_antenna(valid_tx_ant,
1425                                               &search_tbl->current_rate,
1426                                               search_tbl)) {
1427                                 update_search_tbl_counter = 1;
1428                                 goto out;
1429                         }
1430                         break;
1431                 case IWL_SISO_SWITCH_MIMO2:
1432                         IWL_DEBUG_RATE(mvm, "LQ: SISO switch to MIMO2\n");
1433                         memcpy(search_tbl, tbl, sz);
1434                         search_tbl->is_SGI = 0;
1435
1436                         search_tbl->ant_type = ANT_AB;
1437
1438                         if (!rs_is_valid_ant(valid_tx_ant,
1439                                              search_tbl->ant_type))
1440                                 break;
1441
1442                         ret = rs_switch_to_mimo2(mvm, lq_sta, sta,
1443                                                  search_tbl, index);
1444                         if (!ret)
1445                                 goto out;
1446                         break;
1447                 case IWL_SISO_SWITCH_GI:
1448                         if (!rs_sgi_allowed(tbl, sta))
1449                                 break;
1450
1451                         IWL_DEBUG_RATE(mvm, "LQ: SISO toggle SGI/NGI\n");
1452
1453                         memcpy(search_tbl, tbl, sz);
1454                         search_tbl->is_SGI = !tbl->is_SGI;
1455                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1456                         if (tbl->is_SGI) {
1457                                 s32 tpt = lq_sta->last_tpt / 100;
1458                                 if (tpt >= search_tbl->expected_tpt[index])
1459                                         break;
1460                         }
1461                         search_tbl->current_rate =
1462                                 rate_n_flags_from_tbl(mvm, search_tbl, index);
1463                         update_search_tbl_counter = 1;
1464                         goto out;
1465                 default:
1466                         WARN_ON_ONCE(1);
1467                 }
1468                 rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1469
1470                 if (tbl->action == start_action)
1471                         break;
1472         }
1473         search_tbl->lq_type = LQ_NONE;
1474         return 0;
1475
1476  out:
1477         lq_sta->search_better_tbl = 1;
1478         rs_move_next_action(tbl, IWL_SISO_LAST_ACTION);
1479         if (update_search_tbl_counter)
1480                 search_tbl->action = tbl->action;
1481
1482         return 0;
1483 }
1484
1485 /*
1486  * Try to switch to new modulation mode from MIMO2
1487  */
1488 static int rs_move_mimo2_to_other(struct iwl_mvm *mvm,
1489                                  struct iwl_lq_sta *lq_sta,
1490                                  struct ieee80211_sta *sta, int index)
1491 {
1492         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1493         struct iwl_scale_tbl_info *search_tbl =
1494                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1495         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1496                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1497         u8 start_action;
1498         u8 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
1499         u8 update_search_tbl_counter = 0;
1500         int ret;
1501
1502         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1503                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1504
1505         start_action = tbl->action;
1506         while (1) {
1507                 lq_sta->action_counter++;
1508                 switch (tbl->action) {
1509                 case IWL_MIMO2_SWITCH_SISO_A:
1510                 case IWL_MIMO2_SWITCH_SISO_B:
1511                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 switch to SISO\n");
1512
1513                         /* Set up new search table for SISO */
1514                         memcpy(search_tbl, tbl, sz);
1515
1516                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1517                                 search_tbl->ant_type = ANT_A;
1518                         else /* tbl->action == IWL_MIMO2_SWITCH_SISO_B */
1519                                 search_tbl->ant_type = ANT_B;
1520
1521                         if (!rs_is_valid_ant(valid_tx_ant,
1522                                              search_tbl->ant_type))
1523                                 break;
1524
1525                         ret = rs_switch_to_siso(mvm, lq_sta, sta,
1526                                                  search_tbl, index);
1527                         if (!ret)
1528                                 goto out;
1529
1530                         break;
1531
1532                 case IWL_MIMO2_SWITCH_GI:
1533                         if (!rs_sgi_allowed(tbl, sta))
1534                                 break;
1535
1536                         IWL_DEBUG_RATE(mvm, "LQ: MIMO2 toggle SGI/NGI\n");
1537
1538                         /* Set up new search table for MIMO2 */
1539                         memcpy(search_tbl, tbl, sz);
1540                         search_tbl->is_SGI = !tbl->is_SGI;
1541                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1542                         /*
1543                          * If active table already uses the fastest possible
1544                          * modulation (dual stream with short guard interval),
1545                          * and it's working well, there's no need to look
1546                          * for a better type of modulation!
1547                          */
1548                         if (tbl->is_SGI) {
1549                                 s32 tpt = lq_sta->last_tpt / 100;
1550                                 if (tpt >= search_tbl->expected_tpt[index])
1551                                         break;
1552                         }
1553                         search_tbl->current_rate =
1554                                 rate_n_flags_from_tbl(mvm, search_tbl, index);
1555                         update_search_tbl_counter = 1;
1556                         goto out;
1557                 default:
1558                         WARN_ON_ONCE(1);
1559                 }
1560                 rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1561
1562                 if (tbl->action == start_action)
1563                         break;
1564         }
1565         search_tbl->lq_type = LQ_NONE;
1566         return 0;
1567  out:
1568         lq_sta->search_better_tbl = 1;
1569         rs_move_next_action(tbl, IWL_MIMO2_LAST_ACTION);
1570         if (update_search_tbl_counter)
1571                 search_tbl->action = tbl->action;
1572
1573         return 0;
1574 }
1575
1576 /*
1577  * Check whether we should continue using same modulation mode, or
1578  * begin search for a new mode, based on:
1579  * 1) # tx successes or failures while using this mode
1580  * 2) # times calling this function
1581  * 3) elapsed time in this mode (not used, for now)
1582  */
1583 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1584 {
1585         struct iwl_scale_tbl_info *tbl;
1586         int i;
1587         int active_tbl;
1588         int flush_interval_passed = 0;
1589         struct iwl_mvm *mvm;
1590
1591         mvm = lq_sta->drv;
1592         active_tbl = lq_sta->active_tbl;
1593
1594         tbl = &(lq_sta->lq_info[active_tbl]);
1595
1596         /* If we've been disallowing search, see if we should now allow it */
1597         if (lq_sta->stay_in_tbl) {
1598                 /* Elapsed time using current modulation mode */
1599                 if (lq_sta->flush_timer)
1600                         flush_interval_passed =
1601                                 time_after(jiffies,
1602                                            (unsigned long)(lq_sta->flush_timer +
1603                                                 IWL_RATE_SCALE_FLUSH_INTVL));
1604
1605                 /*
1606                  * Check if we should allow search for new modulation mode.
1607                  * If many frames have failed or succeeded, or we've used
1608                  * this same modulation for a long time, allow search, and
1609                  * reset history stats that keep track of whether we should
1610                  * allow a new search.  Also (below) reset all bitmaps and
1611                  * stats in active history.
1612                  */
1613                 if (force_search ||
1614                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1615                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1616                     ((!lq_sta->search_better_tbl) &&
1617                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1618                         IWL_DEBUG_RATE(mvm,
1619                                        "LQ: stay is expired %d %d %d\n",
1620                                      lq_sta->total_failed,
1621                                      lq_sta->total_success,
1622                                      flush_interval_passed);
1623
1624                         /* Allow search for new mode */
1625                         lq_sta->stay_in_tbl = 0;        /* only place reset */
1626                         lq_sta->total_failed = 0;
1627                         lq_sta->total_success = 0;
1628                         lq_sta->flush_timer = 0;
1629                 /*
1630                  * Else if we've used this modulation mode enough repetitions
1631                  * (regardless of elapsed time or success/failure), reset
1632                  * history bitmaps and rate-specific stats for all rates in
1633                  * active table.
1634                  */
1635                 } else {
1636                         lq_sta->table_count++;
1637                         if (lq_sta->table_count >=
1638                             lq_sta->table_count_limit) {
1639                                 lq_sta->table_count = 0;
1640
1641                                 IWL_DEBUG_RATE(mvm,
1642                                                "LQ: stay in table clear win\n");
1643                                 for (i = 0; i < IWL_RATE_COUNT; i++)
1644                                         rs_rate_scale_clear_window(
1645                                                 &(tbl->win[i]));
1646                         }
1647                 }
1648
1649                 /* If transitioning to allow "search", reset all history
1650                  * bitmaps and stats in active table (this will become the new
1651                  * "search" table). */
1652                 if (!lq_sta->stay_in_tbl) {
1653                         for (i = 0; i < IWL_RATE_COUNT; i++)
1654                                 rs_rate_scale_clear_window(&(tbl->win[i]));
1655                 }
1656         }
1657 }
1658
1659 /*
1660  * setup rate table in uCode
1661  */
1662 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1663                                struct ieee80211_sta *sta,
1664                                struct iwl_lq_sta *lq_sta,
1665                                struct iwl_scale_tbl_info *tbl,
1666                                int index)
1667 {
1668         u32 rate;
1669
1670         /* Update uCode's rate table. */
1671         rate = rate_n_flags_from_tbl(mvm, tbl, index);
1672         rs_fill_link_cmd(mvm, sta, lq_sta, rate);
1673         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1674 }
1675
1676 static u8 rs_get_tid(struct iwl_lq_sta *lq_data,
1677                      struct ieee80211_hdr *hdr)
1678 {
1679         u8 tid = IWL_MAX_TID_COUNT;
1680
1681         if (ieee80211_is_data_qos(hdr->frame_control)) {
1682                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1683                 tid = qc[0] & 0xf;
1684         }
1685
1686         if (unlikely(tid > IWL_MAX_TID_COUNT))
1687                 tid = IWL_MAX_TID_COUNT;
1688
1689         return tid;
1690 }
1691
1692 /*
1693  * Do rate scaling and search for new modulation mode.
1694  */
1695 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
1696                                   struct sk_buff *skb,
1697                                   struct ieee80211_sta *sta,
1698                                   struct iwl_lq_sta *lq_sta)
1699 {
1700         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1701         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1702         int low = IWL_RATE_INVALID;
1703         int high = IWL_RATE_INVALID;
1704         int index;
1705         int i;
1706         struct iwl_rate_scale_data *window = NULL;
1707         int current_tpt = IWL_INVALID_VALUE;
1708         int low_tpt = IWL_INVALID_VALUE;
1709         int high_tpt = IWL_INVALID_VALUE;
1710         u32 fail_count;
1711         s8 scale_action = 0;
1712         u16 rate_mask;
1713         u8 update_lq = 0;
1714         struct iwl_scale_tbl_info *tbl, *tbl1;
1715         u16 rate_scale_index_msk = 0;
1716         u8 active_tbl = 0;
1717         u8 done_search = 0;
1718         u16 high_low;
1719         s32 sr;
1720         u8 tid = IWL_MAX_TID_COUNT;
1721         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
1722         struct iwl_mvm_tid_data *tid_data;
1723
1724         IWL_DEBUG_RATE(mvm, "rate scale calculate new rate for skb\n");
1725
1726         /* Send management frames and NO_ACK data using lowest rate. */
1727         /* TODO: this could probably be improved.. */
1728         if (!ieee80211_is_data(hdr->frame_control) ||
1729             info->flags & IEEE80211_TX_CTL_NO_ACK)
1730                 return;
1731
1732         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
1733
1734         tid = rs_get_tid(lq_sta, hdr);
1735         if ((tid != IWL_MAX_TID_COUNT) &&
1736             (lq_sta->tx_agg_tid_en & (1 << tid))) {
1737                 tid_data = &sta_priv->tid_data[tid];
1738                 if (tid_data->state == IWL_AGG_OFF)
1739                         lq_sta->is_agg = 0;
1740                 else
1741                         lq_sta->is_agg = 1;
1742         } else {
1743                 lq_sta->is_agg = 0;
1744         }
1745
1746         /*
1747          * Select rate-scale / modulation-mode table to work with in
1748          * the rest of this function:  "search" if searching for better
1749          * modulation mode, or "active" if doing rate scaling within a mode.
1750          */
1751         if (!lq_sta->search_better_tbl)
1752                 active_tbl = lq_sta->active_tbl;
1753         else
1754                 active_tbl = 1 - lq_sta->active_tbl;
1755
1756         tbl = &(lq_sta->lq_info[active_tbl]);
1757
1758         /* current tx rate */
1759         index = lq_sta->last_txrate_idx;
1760
1761         IWL_DEBUG_RATE(mvm, "Rate scale index %d for type %d\n", index,
1762                        tbl->lq_type);
1763
1764         /* rates available for this association, and for modulation mode */
1765         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1766
1767         IWL_DEBUG_RATE(mvm, "mask 0x%04X\n", rate_mask);
1768
1769         /* mask with station rate restriction */
1770         if (is_legacy(tbl->lq_type)) {
1771                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1772                         /* supp_rates has no CCK bits in A mode */
1773                         rate_scale_index_msk = (u16) (rate_mask &
1774                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1775                 else
1776                         rate_scale_index_msk = (u16) (rate_mask &
1777                                                       lq_sta->supp_rates);
1778
1779         } else {
1780                 rate_scale_index_msk = rate_mask;
1781         }
1782
1783         if (!rate_scale_index_msk)
1784                 rate_scale_index_msk = rate_mask;
1785
1786         if (!((1 << index) & rate_scale_index_msk)) {
1787                 IWL_ERR(mvm, "Current Rate is not valid\n");
1788                 if (lq_sta->search_better_tbl) {
1789                         /* revert to active table if search table is not valid*/
1790                         tbl->lq_type = LQ_NONE;
1791                         lq_sta->search_better_tbl = 0;
1792                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1793                         /* get "active" rate info */
1794                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1795                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
1796                 }
1797                 return;
1798         }
1799
1800         /* Get expected throughput table and history window for current rate */
1801         if (!tbl->expected_tpt) {
1802                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
1803                 return;
1804         }
1805
1806         /* force user max rate if set by user */
1807         if ((lq_sta->max_rate_idx != -1) &&
1808             (lq_sta->max_rate_idx < index)) {
1809                 index = lq_sta->max_rate_idx;
1810                 update_lq = 1;
1811                 window = &(tbl->win[index]);
1812                 goto lq_update;
1813         }
1814
1815         window = &(tbl->win[index]);
1816
1817         /*
1818          * If there is not enough history to calculate actual average
1819          * throughput, keep analyzing results of more tx frames, without
1820          * changing rate or mode (bypass most of the rest of this function).
1821          * Set up new rate table in uCode only if old rate is not supported
1822          * in current association (use new rate found above).
1823          */
1824         fail_count = window->counter - window->success_counter;
1825         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1826             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1827                 IWL_DEBUG_RATE(mvm,
1828                                "LQ: still below TH. succ=%d total=%d for index %d\n",
1829                                window->success_counter, window->counter, index);
1830
1831                 /* Can't calculate this yet; not enough history */
1832                 window->average_tpt = IWL_INVALID_VALUE;
1833
1834                 /* Should we stay with this modulation mode,
1835                  * or search for a new one? */
1836                 rs_stay_in_table(lq_sta, false);
1837
1838                 goto out;
1839         }
1840         /* Else we have enough samples; calculate estimate of
1841          * actual average throughput */
1842         if (window->average_tpt != ((window->success_ratio *
1843                         tbl->expected_tpt[index] + 64) / 128)) {
1844                 IWL_ERR(mvm,
1845                         "expected_tpt should have been calculated by now\n");
1846                 window->average_tpt = ((window->success_ratio *
1847                                         tbl->expected_tpt[index] + 64) / 128);
1848         }
1849
1850         /* If we are searching for better modulation mode, check success. */
1851         if (lq_sta->search_better_tbl) {
1852                 /* If good success, continue using the "search" mode;
1853                  * no need to send new link quality command, since we're
1854                  * continuing to use the setup that we've been trying. */
1855                 if (window->average_tpt > lq_sta->last_tpt) {
1856                         IWL_DEBUG_RATE(mvm,
1857                                        "LQ: SWITCHING TO NEW TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1858                                        window->success_ratio,
1859                                        window->average_tpt,
1860                                        lq_sta->last_tpt);
1861
1862                         if (!is_legacy(tbl->lq_type))
1863                                 lq_sta->enable_counter = 1;
1864
1865                         /* Swap tables; "search" becomes "active" */
1866                         lq_sta->active_tbl = active_tbl;
1867                         current_tpt = window->average_tpt;
1868                 /* Else poor success; go back to mode in "active" table */
1869                 } else {
1870                         IWL_DEBUG_RATE(mvm,
1871                                        "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
1872                                        window->success_ratio,
1873                                        window->average_tpt,
1874                                        lq_sta->last_tpt);
1875
1876                         /* Nullify "search" table */
1877                         tbl->lq_type = LQ_NONE;
1878
1879                         /* Revert to "active" table */
1880                         active_tbl = lq_sta->active_tbl;
1881                         tbl = &(lq_sta->lq_info[active_tbl]);
1882
1883                         /* Revert to "active" rate and throughput info */
1884                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1885                         current_tpt = lq_sta->last_tpt;
1886
1887                         /* Need to set up a new rate table in uCode */
1888                         update_lq = 1;
1889                 }
1890
1891                 /* Either way, we've made a decision; modulation mode
1892                  * search is done, allow rate adjustment next time. */
1893                 lq_sta->search_better_tbl = 0;
1894                 done_search = 1;        /* Don't switch modes below! */
1895                 goto lq_update;
1896         }
1897
1898         /* (Else) not in search of better modulation mode, try for better
1899          * starting rate, while staying in this mode. */
1900         high_low = rs_get_adjacent_rate(mvm, index, rate_scale_index_msk,
1901                                         tbl->lq_type);
1902         low = high_low & 0xff;
1903         high = (high_low >> 8) & 0xff;
1904
1905         /* If user set max rate, dont allow higher than user constrain */
1906         if ((lq_sta->max_rate_idx != -1) &&
1907             (lq_sta->max_rate_idx < high))
1908                 high = IWL_RATE_INVALID;
1909
1910         sr = window->success_ratio;
1911
1912         /* Collect measured throughputs for current and adjacent rates */
1913         current_tpt = window->average_tpt;
1914         if (low != IWL_RATE_INVALID)
1915                 low_tpt = tbl->win[low].average_tpt;
1916         if (high != IWL_RATE_INVALID)
1917                 high_tpt = tbl->win[high].average_tpt;
1918
1919         scale_action = 0;
1920
1921         /* Too many failures, decrease rate */
1922         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1923                 IWL_DEBUG_RATE(mvm,
1924                                "decrease rate because of low success_ratio\n");
1925                 scale_action = -1;
1926         /* No throughput measured yet for adjacent rates; try increase. */
1927         } else if ((low_tpt == IWL_INVALID_VALUE) &&
1928                    (high_tpt == IWL_INVALID_VALUE)) {
1929                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1930                         scale_action = 1;
1931                 else if (low != IWL_RATE_INVALID)
1932                         scale_action = 0;
1933         }
1934
1935         /* Both adjacent throughputs are measured, but neither one has better
1936          * throughput; we're using the best rate, don't change it! */
1937         else if ((low_tpt != IWL_INVALID_VALUE) &&
1938                  (high_tpt != IWL_INVALID_VALUE) &&
1939                  (low_tpt < current_tpt) &&
1940                  (high_tpt < current_tpt))
1941                 scale_action = 0;
1942
1943         /* At least one adjacent rate's throughput is measured,
1944          * and may have better performance. */
1945         else {
1946                 /* Higher adjacent rate's throughput is measured */
1947                 if (high_tpt != IWL_INVALID_VALUE) {
1948                         /* Higher rate has better throughput */
1949                         if (high_tpt > current_tpt &&
1950                             sr >= IWL_RATE_INCREASE_TH) {
1951                                 scale_action = 1;
1952                         } else {
1953                                 scale_action = 0;
1954                         }
1955
1956                 /* Lower adjacent rate's throughput is measured */
1957                 } else if (low_tpt != IWL_INVALID_VALUE) {
1958                         /* Lower rate has better throughput */
1959                         if (low_tpt > current_tpt) {
1960                                 IWL_DEBUG_RATE(mvm,
1961                                                "decrease rate because of low tpt\n");
1962                                 scale_action = -1;
1963                         } else if (sr >= IWL_RATE_INCREASE_TH) {
1964                                 scale_action = 1;
1965                         }
1966                 }
1967         }
1968
1969         /* Sanity check; asked for decrease, but success rate or throughput
1970          * has been good at old rate.  Don't change it. */
1971         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1972             ((sr > IWL_RATE_HIGH_TH) ||
1973              (current_tpt > (100 * tbl->expected_tpt[low]))))
1974                 scale_action = 0;
1975
1976         /* Force a search in case BT doesn't like us being in MIMO */
1977         if (is_mimo(tbl->lq_type) &&
1978             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
1979                 rs_stay_in_table(lq_sta, true);
1980                 goto lq_update;
1981         }
1982
1983         switch (scale_action) {
1984         case -1:
1985                 /* Decrease starting rate, update uCode's rate table */
1986                 if (low != IWL_RATE_INVALID) {
1987                         update_lq = 1;
1988                         index = low;
1989                 }
1990
1991                 break;
1992         case 1:
1993                 /* Increase starting rate, update uCode's rate table */
1994                 if (high != IWL_RATE_INVALID) {
1995                         update_lq = 1;
1996                         index = high;
1997                 }
1998
1999                 break;
2000         case 0:
2001                 /* No change */
2002         default:
2003                 break;
2004         }
2005
2006         IWL_DEBUG_RATE(mvm,
2007                        "choose rate scale index %d action %d low %d high %d type %d\n",
2008                        index, scale_action, low, high, tbl->lq_type);
2009
2010 lq_update:
2011         /* Replace uCode's rate table for the destination station. */
2012         if (update_lq)
2013                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl, index);
2014
2015         rs_stay_in_table(lq_sta, false);
2016
2017         /*
2018          * Search for new modulation mode if we're:
2019          * 1)  Not changing rates right now
2020          * 2)  Not just finishing up a search
2021          * 3)  Allowing a new search
2022          */
2023         if (!update_lq && !done_search &&
2024             !lq_sta->stay_in_tbl && window->counter) {
2025                 /* Save current throughput to compare with "search" throughput*/
2026                 lq_sta->last_tpt = current_tpt;
2027
2028                 /* Select a new "search" modulation mode to try.
2029                  * If one is found, set up the new "search" table. */
2030                 if (is_legacy(tbl->lq_type))
2031                         rs_move_legacy_other(mvm, lq_sta, sta, index);
2032                 else if (is_siso(tbl->lq_type))
2033                         rs_move_siso_to_other(mvm, lq_sta, sta, index);
2034                 else if (is_mimo2(tbl->lq_type))
2035                         rs_move_mimo2_to_other(mvm, lq_sta, sta, index);
2036                 else
2037                         WARN_ON_ONCE(1);
2038
2039                 /* If new "search" mode was selected, set up in uCode table */
2040                 if (lq_sta->search_better_tbl) {
2041                         /* Access the "search" table, clear its history. */
2042                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2043                         for (i = 0; i < IWL_RATE_COUNT; i++)
2044                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2045
2046                         /* Use new "search" start rate */
2047                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2048
2049                         IWL_DEBUG_RATE(mvm,
2050                                        "Switch current  mcs: %X index: %d\n",
2051                                        tbl->current_rate, index);
2052                         rs_fill_link_cmd(mvm, sta, lq_sta, tbl->current_rate);
2053                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2054                 } else {
2055                         done_search = 1;
2056                 }
2057         }
2058
2059         if (done_search && !lq_sta->stay_in_tbl) {
2060                 /* If the "active" (non-search) mode was legacy,
2061                  * and we've tried switching antennas,
2062                  * but we haven't been able to try HT modes (not available),
2063                  * stay with best antenna legacy modulation for a while
2064                  * before next round of mode comparisons. */
2065                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2066                 if (is_legacy(tbl1->lq_type) && !sta->ht_cap.ht_supported &&
2067                     lq_sta->action_counter > tbl1->max_search) {
2068                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2069                         rs_set_stay_in_table(mvm, 1, lq_sta);
2070                 }
2071
2072                 /* If we're in an HT mode, and all 3 mode switch actions
2073                  * have been tried and compared, stay in this best modulation
2074                  * mode for a while before next round of mode comparisons. */
2075                 if (lq_sta->enable_counter &&
2076                     (lq_sta->action_counter >= tbl1->max_search)) {
2077                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2078                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2079                             (tid != IWL_MAX_TID_COUNT)) {
2080                                 tid_data = &sta_priv->tid_data[tid];
2081                                 if (tid_data->state == IWL_AGG_OFF) {
2082                                         IWL_DEBUG_RATE(mvm,
2083                                                        "try to aggregate tid %d\n",
2084                                                        tid);
2085                                         rs_tl_turn_on_agg(mvm, tid,
2086                                                           lq_sta, sta);
2087                                 }
2088                         }
2089                         rs_set_stay_in_table(mvm, 0, lq_sta);
2090                 }
2091         }
2092
2093 out:
2094         tbl->current_rate = rate_n_flags_from_tbl(mvm, tbl, index);
2095         lq_sta->last_txrate_idx = index;
2096 }
2097
2098 /**
2099  * rs_initialize_lq - Initialize a station's hardware rate table
2100  *
2101  * The uCode's station table contains a table of fallback rates
2102  * for automatic fallback during transmission.
2103  *
2104  * NOTE: This sets up a default set of values.  These will be replaced later
2105  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2106  *       rc80211_simple.
2107  *
2108  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2109  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2110  *       which requires station table entry to exist).
2111  */
2112 static void rs_initialize_lq(struct iwl_mvm *mvm,
2113                              struct ieee80211_sta *sta,
2114                              struct iwl_lq_sta *lq_sta,
2115                              enum ieee80211_band band,
2116                              bool init)
2117 {
2118         struct iwl_scale_tbl_info *tbl;
2119         int rate_idx;
2120         int i;
2121         u32 rate;
2122         u8 active_tbl = 0;
2123         u8 valid_tx_ant;
2124
2125         if (!sta || !lq_sta)
2126                 return;
2127
2128         i = lq_sta->last_txrate_idx;
2129
2130         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2131
2132         if (!lq_sta->search_better_tbl)
2133                 active_tbl = lq_sta->active_tbl;
2134         else
2135                 active_tbl = 1 - lq_sta->active_tbl;
2136
2137         tbl = &(lq_sta->lq_info[active_tbl]);
2138
2139         if ((i < 0) || (i >= IWL_RATE_COUNT))
2140                 i = 0;
2141
2142         rate = iwl_rates[i].plcp;
2143         tbl->ant_type = first_antenna(valid_tx_ant);
2144         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2145
2146         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2147                 rate |= RATE_MCS_CCK_MSK;
2148
2149         rs_get_tbl_info_from_mcs(rate, band, tbl, &rate_idx);
2150         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2151                 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2152
2153         rate = rate_n_flags_from_tbl(mvm, tbl, rate_idx);
2154         tbl->current_rate = rate;
2155         rs_set_expected_tpt_table(lq_sta, tbl);
2156         rs_fill_link_cmd(NULL, NULL, lq_sta, rate);
2157         /* TODO restore station should remember the lq cmd */
2158         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2159 }
2160
2161 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2162                         struct ieee80211_tx_rate_control *txrc)
2163 {
2164         struct sk_buff *skb = txrc->skb;
2165         struct ieee80211_supported_band *sband = txrc->sband;
2166         struct iwl_op_mode *op_mode __maybe_unused =
2167                         (struct iwl_op_mode *)mvm_r;
2168         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2169         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2170         struct iwl_lq_sta *lq_sta = mvm_sta;
2171
2172         IWL_DEBUG_RATE_LIMIT(mvm, "rate scale calculate new rate for skb\n");
2173
2174         /* Get max rate if user set max rate */
2175         if (lq_sta) {
2176                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2177                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2178                     (lq_sta->max_rate_idx != -1))
2179                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2180                 if ((lq_sta->max_rate_idx < 0) ||
2181                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2182                         lq_sta->max_rate_idx = -1;
2183         }
2184
2185         /* Treat uninitialized rate scaling data same as non-existing. */
2186         if (lq_sta && !lq_sta->drv) {
2187                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2188                 mvm_sta = NULL;
2189         }
2190
2191         /* Send management frames and NO_ACK data using lowest rate. */
2192         if (rate_control_send_low(sta, mvm_sta, txrc))
2193                 return;
2194
2195         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2196                                   info->band, &info->control.rates[0]);
2197
2198         info->control.rates[0].count = 1;
2199 }
2200
2201 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2202                           gfp_t gfp)
2203 {
2204         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2205         struct iwl_op_mode *op_mode __maybe_unused =
2206                         (struct iwl_op_mode *)mvm_rate;
2207         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2208
2209         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2210
2211         return &sta_priv->lq_sta;
2212 }
2213
2214 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2215                                        int nss)
2216 {
2217         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2218                 (0x3 << (2 * (nss - 1)));
2219         rx_mcs >>= (2 * (nss - 1));
2220
2221         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2222                 return IWL_RATE_MCS_7_INDEX;
2223         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2224                 return IWL_RATE_MCS_8_INDEX;
2225         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2226                 return IWL_RATE_MCS_9_INDEX;
2227
2228         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2229         return -1;
2230 }
2231
2232 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2233                                      struct ieee80211_sta_vht_cap *vht_cap,
2234                                      struct iwl_lq_sta *lq_sta)
2235 {
2236         int i;
2237         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2238
2239         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2240                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2241                         if (i == IWL_RATE_9M_INDEX)
2242                                 continue;
2243
2244                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2245                         if (i == IWL_RATE_MCS_9_INDEX &&
2246                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2247                                 continue;
2248
2249                         lq_sta->active_siso_rate |= BIT(i);
2250                 }
2251         }
2252
2253         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2254         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2255                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2256                         if (i == IWL_RATE_9M_INDEX)
2257                                 continue;
2258
2259                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2260                         if (i == IWL_RATE_MCS_9_INDEX &&
2261                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2262                                 continue;
2263
2264                         lq_sta->active_mimo2_rate |= BIT(i);
2265                 }
2266         }
2267 }
2268
2269 /*
2270  * Called after adding a new station to initialize rate scaling
2271  */
2272 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2273                           enum ieee80211_band band, bool init)
2274 {
2275         int i, j;
2276         struct ieee80211_hw *hw = mvm->hw;
2277         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2278         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2279         struct iwl_mvm_sta *sta_priv;
2280         struct iwl_lq_sta *lq_sta;
2281         struct ieee80211_supported_band *sband;
2282         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2283
2284         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2285         lq_sta = &sta_priv->lq_sta;
2286         memset(lq_sta, 0, sizeof(*lq_sta));
2287
2288         sband = hw->wiphy->bands[band];
2289
2290         lq_sta->lq.sta_id = sta_priv->sta_id;
2291
2292         for (j = 0; j < LQ_SIZE; j++)
2293                 for (i = 0; i < IWL_RATE_COUNT; i++)
2294                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2295
2296         lq_sta->flush_timer = 0;
2297         lq_sta->supp_rates = sta->supp_rates[sband->band];
2298
2299         IWL_DEBUG_RATE(mvm,
2300                        "LQ: *** rate scale station global init for station %d ***\n",
2301                        sta_priv->sta_id);
2302         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2303          * the lowest or the highest rate.. Could consider using RSSI from
2304          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2305          * after assoc.. */
2306
2307         lq_sta->max_rate_idx = -1;
2308         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2309         lq_sta->band = sband->band;
2310         /*
2311          * active legacy rates as per supported rates bitmap
2312          */
2313         supp = sta->supp_rates[sband->band];
2314         lq_sta->active_legacy_rate = 0;
2315         for_each_set_bit(i, &supp, BITS_PER_LONG)
2316                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2317
2318         /* TODO: should probably account for rx_highest for both HT/VHT */
2319         if (!vht_cap || !vht_cap->vht_supported) {
2320                 /* active_siso_rate mask includes 9 MBits (bit 5),
2321                  * and CCK (bits 0-3), supp_rates[] does not;
2322                  * shift to convert format, force 9 MBits off.
2323                  */
2324                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2325                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2326                 lq_sta->active_siso_rate &= ~((u16)0x2);
2327                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2328
2329                 /* Same here */
2330                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2331                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2332                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2333                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2334
2335                 lq_sta->is_vht = false;
2336         } else {
2337                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2338                 lq_sta->is_vht = true;
2339         }
2340
2341         IWL_DEBUG_RATE(mvm,
2342                        "SISO-RATE=%X MIMO2-RATE=%X VHT=%d\n",
2343                        lq_sta->active_siso_rate,
2344                        lq_sta->active_mimo2_rate,
2345                        lq_sta->is_vht);
2346
2347         /* These values will be overridden later */
2348         lq_sta->lq.single_stream_ant_msk =
2349                 first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2350         lq_sta->lq.dual_stream_ant_msk =
2351                 iwl_fw_valid_tx_ant(mvm->fw) &
2352                 ~first_antenna(iwl_fw_valid_tx_ant(mvm->fw));
2353         if (!lq_sta->lq.dual_stream_ant_msk) {
2354                 lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2355         } else if (num_of_ant(iwl_fw_valid_tx_ant(mvm->fw)) == 2) {
2356                 lq_sta->lq.dual_stream_ant_msk =
2357                         iwl_fw_valid_tx_ant(mvm->fw);
2358         }
2359
2360         /* as default allow aggregation for all tids */
2361         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2362         lq_sta->drv = mvm;
2363
2364         /* Set last_txrate_idx to lowest rate */
2365         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2366         if (sband->band == IEEE80211_BAND_5GHZ)
2367                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2368         lq_sta->is_agg = 0;
2369 #ifdef CONFIG_MAC80211_DEBUGFS
2370         lq_sta->dbg_fixed_rate = 0;
2371 #endif
2372
2373         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2374 }
2375
2376 static void rs_rate_update(void *mvm_r,
2377                            struct ieee80211_supported_band *sband,
2378                            struct cfg80211_chan_def *chandef,
2379                            struct ieee80211_sta *sta, void *priv_sta,
2380                            u32 changed)
2381 {
2382         u8 tid;
2383         struct iwl_op_mode *op_mode  =
2384                         (struct iwl_op_mode *)mvm_r;
2385         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2386
2387         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2388         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2389                 ieee80211_stop_tx_ba_session(sta, tid);
2390
2391         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2392 }
2393
2394 static void rs_fill_link_cmd(struct iwl_mvm *mvm,
2395                              struct ieee80211_sta *sta,
2396                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2397 {
2398         struct iwl_scale_tbl_info tbl_type;
2399         int index = 0;
2400         int rate_idx;
2401         int repeat_rate = 0;
2402         u8 ant_toggle_cnt = 0;
2403         u8 use_ht_possible = 1;
2404         u8 valid_tx_ant = 0;
2405         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2406
2407         /* Override starting rate (index 0) if needed for debug purposes */
2408         rs_dbgfs_set_mcs(lq_sta, &new_rate);
2409
2410         /* Interpret new_rate (rate_n_flags) */
2411         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2412                                  &tbl_type, &rate_idx);
2413
2414         /* How many times should we repeat the initial rate? */
2415         if (is_legacy(tbl_type.lq_type)) {
2416                 ant_toggle_cnt = 1;
2417                 repeat_rate = IWL_NUMBER_TRY;
2418         } else {
2419                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2420                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2421         }
2422
2423         lq_cmd->mimo_delim = is_mimo(tbl_type.lq_type) ? 1 : 0;
2424
2425         /* Fill 1st table entry (index 0) */
2426         lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2427
2428         if (num_of_ant(tbl_type.ant_type) == 1)
2429                 lq_cmd->single_stream_ant_msk = tbl_type.ant_type;
2430         else if (num_of_ant(tbl_type.ant_type) == 2)
2431                 lq_cmd->dual_stream_ant_msk = tbl_type.ant_type;
2432         /* otherwise we don't modify the existing value */
2433
2434         index++;
2435         repeat_rate--;
2436         if (mvm)
2437                 valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2438
2439         /* Fill rest of rate table */
2440         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2441                 /* Repeat initial/next rate.
2442                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2443                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2444                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2445                         if (is_legacy(tbl_type.lq_type)) {
2446                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2447                                         ant_toggle_cnt++;
2448                                 else if (mvm &&
2449                                          rs_toggle_antenna(valid_tx_ant,
2450                                                         &new_rate, &tbl_type))
2451                                         ant_toggle_cnt = 1;
2452                         }
2453
2454                         /* Override next rate if needed for debug purposes */
2455                         rs_dbgfs_set_mcs(lq_sta, &new_rate);
2456
2457                         /* Fill next table entry */
2458                         lq_cmd->rs_table[index] =
2459                                         cpu_to_le32(new_rate);
2460                         repeat_rate--;
2461                         index++;
2462                 }
2463
2464                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2465                                          &rate_idx);
2466
2467                 /* Indicate to uCode which entries might be MIMO.
2468                  * If initial rate was MIMO, this will finally end up
2469                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2470                 if (is_mimo(tbl_type.lq_type))
2471                         lq_cmd->mimo_delim = index;
2472
2473                 /* Get next rate */
2474                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2475                                              use_ht_possible);
2476
2477                 /* How many times should we repeat the next rate? */
2478                 if (is_legacy(tbl_type.lq_type)) {
2479                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2480                                 ant_toggle_cnt++;
2481                         else if (mvm &&
2482                                  rs_toggle_antenna(valid_tx_ant,
2483                                                    &new_rate, &tbl_type))
2484                                 ant_toggle_cnt = 1;
2485
2486                         repeat_rate = IWL_NUMBER_TRY;
2487                 } else {
2488                         repeat_rate = IWL_HT_NUMBER_TRY;
2489                 }
2490
2491                 /* Don't allow HT rates after next pass.
2492                  * rs_get_lower_rate() will change type to LQ_LEGACY_A
2493                  * or LQ_LEGACY_G.
2494                  */
2495                 use_ht_possible = 0;
2496
2497                 /* Override next rate if needed for debug purposes */
2498                 rs_dbgfs_set_mcs(lq_sta, &new_rate);
2499
2500                 /* Fill next table entry */
2501                 lq_cmd->rs_table[index] = cpu_to_le32(new_rate);
2502
2503                 index++;
2504                 repeat_rate--;
2505         }
2506
2507         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2508         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2509
2510         lq_cmd->agg_time_limit =
2511                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2512
2513         if (sta)
2514                 lq_cmd->agg_time_limit =
2515                         cpu_to_le16(iwl_mvm_bt_coex_agg_time_limit(mvm, sta));
2516 }
2517
2518 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
2519 {
2520         return hw->priv;
2521 }
2522 /* rate scale requires free function to be implemented */
2523 static void rs_free(void *mvm_rate)
2524 {
2525         return;
2526 }
2527
2528 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
2529                         void *mvm_sta)
2530 {
2531         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
2532         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2533
2534         IWL_DEBUG_RATE(mvm, "enter\n");
2535         IWL_DEBUG_RATE(mvm, "leave\n");
2536 }
2537
2538 #ifdef CONFIG_MAC80211_DEBUGFS
2539 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
2540                              u32 *rate_n_flags)
2541 {
2542         struct iwl_mvm *mvm;
2543         u8 valid_tx_ant;
2544         u8 ant_sel_tx;
2545
2546         mvm = lq_sta->drv;
2547         valid_tx_ant = iwl_fw_valid_tx_ant(mvm->fw);
2548         if (lq_sta->dbg_fixed_rate) {
2549                 ant_sel_tx =
2550                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
2551                   >> RATE_MCS_ANT_POS);
2552                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
2553                         *rate_n_flags = lq_sta->dbg_fixed_rate;
2554                         IWL_DEBUG_RATE(mvm, "Fixed rate ON\n");
2555                 } else {
2556                         lq_sta->dbg_fixed_rate = 0;
2557                         IWL_ERR(mvm,
2558                                 "Invalid antenna selection 0x%X, Valid is 0x%X\n",
2559                                 ant_sel_tx, valid_tx_ant);
2560                         IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2561                 }
2562         } else {
2563                 IWL_DEBUG_RATE(mvm, "Fixed rate OFF\n");
2564         }
2565 }
2566
2567 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2568                         const char __user *user_buf, size_t count, loff_t *ppos)
2569 {
2570         struct iwl_lq_sta *lq_sta = file->private_data;
2571         struct iwl_mvm *mvm;
2572         char buf[64];
2573         size_t buf_size;
2574         u32 parsed_rate;
2575
2576
2577         mvm = lq_sta->drv;
2578         memset(buf, 0, sizeof(buf));
2579         buf_size = min(count, sizeof(buf) -  1);
2580         if (copy_from_user(buf, user_buf, buf_size))
2581                 return -EFAULT;
2582
2583         if (sscanf(buf, "%x", &parsed_rate) == 1)
2584                 lq_sta->dbg_fixed_rate = parsed_rate;
2585         else
2586                 lq_sta->dbg_fixed_rate = 0;
2587
2588         rs_program_fix_rate(mvm, lq_sta);
2589
2590         return count;
2591 }
2592
2593 static int rs_pretty_print_rate(char *buf, const u32 rate)
2594 {
2595         static const char * const ant_name[] = {
2596                 [ANT_NONE] = "None",
2597                 [ANT_A]    = "A",
2598                 [ANT_B]    = "B",
2599                 [ANT_AB]   = "AB",
2600                 [ANT_C]    = "C",
2601                 [ANT_AC]   = "AC",
2602                 [ANT_BC]   = "BC",
2603                 [ANT_ABC]  = "ABC",
2604         };
2605
2606         char *type, *bw;
2607         u8 mcs = 0, nss = 0;
2608         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2609
2610         if (!(rate & RATE_MCS_HT_MSK) &&
2611             !(rate & RATE_MCS_VHT_MSK)) {
2612                 int index = iwl_hwrate_to_plcp_idx(rate);
2613
2614                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
2615                                ant_name[ant], iwl_rate_mcs[index].mbps);
2616         }
2617
2618         if (rate & RATE_MCS_VHT_MSK) {
2619                 type = "VHT";
2620                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2621                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
2622                        >> RATE_VHT_MCS_NSS_POS) + 1;
2623         } else if (rate & RATE_MCS_HT_MSK) {
2624                 type = "HT";
2625                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
2626         } else {
2627                 type = "Unknown"; /* shouldn't happen */
2628         }
2629
2630         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2631         case RATE_MCS_CHAN_WIDTH_20:
2632                 bw = "20Mhz";
2633                 break;
2634         case RATE_MCS_CHAN_WIDTH_40:
2635                 bw = "40Mhz";
2636                 break;
2637         case RATE_MCS_CHAN_WIDTH_80:
2638                 bw = "80Mhz";
2639                 break;
2640         case RATE_MCS_CHAN_WIDTH_160:
2641                 bw = "160Mhz";
2642                 break;
2643         default:
2644                 bw = "BAD BW";
2645         }
2646
2647         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
2648                        type, ant_name[ant], bw, mcs, nss,
2649                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
2650                        (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
2651                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
2652                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
2653                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
2654 }
2655
2656 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2657                         char __user *user_buf, size_t count, loff_t *ppos)
2658 {
2659         char *buff;
2660         int desc = 0;
2661         int i = 0;
2662         ssize_t ret;
2663
2664         struct iwl_lq_sta *lq_sta = file->private_data;
2665         struct iwl_mvm *mvm;
2666         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2667
2668         mvm = lq_sta->drv;
2669         buff = kmalloc(2048, GFP_KERNEL);
2670         if (!buff)
2671                 return -ENOMEM;
2672
2673         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2674         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2675                         lq_sta->total_failed, lq_sta->total_success,
2676                         lq_sta->active_legacy_rate);
2677         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2678                         lq_sta->dbg_fixed_rate);
2679         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
2680             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_A) ? "ANT_A," : "",
2681             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_B) ? "ANT_B," : "",
2682             (iwl_fw_valid_tx_ant(mvm->fw) & ANT_C) ? "ANT_C" : "");
2683         desc += sprintf(buff+desc, "lq type %s\n",
2684                         (is_legacy(tbl->lq_type)) ? "legacy" :
2685                         is_vht(tbl->lq_type) ? "VHT" : "HT");
2686         if (!is_legacy(tbl->lq_type)) {
2687                 desc += sprintf(buff+desc, " %s",
2688                    (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
2689                    desc += sprintf(buff+desc, " %s",
2690                                    (is_ht20(tbl)) ? "20MHz" :
2691                                    (is_ht40(tbl)) ? "40MHz" :
2692                                    (is_ht80(tbl)) ? "80Mhz" : "BAD BW");
2693                    desc += sprintf(buff+desc, " %s %s\n",
2694                                    (tbl->is_SGI) ? "SGI" : "NGI",
2695                                    (lq_sta->is_agg) ? "AGG on" : "");
2696         }
2697         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
2698                         lq_sta->last_rate_n_flags);
2699         desc += sprintf(buff+desc,
2700                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
2701                         lq_sta->lq.flags,
2702                         lq_sta->lq.mimo_delim,
2703                         lq_sta->lq.single_stream_ant_msk,
2704                         lq_sta->lq.dual_stream_ant_msk);
2705
2706         desc += sprintf(buff+desc,
2707                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2708                         le16_to_cpu(lq_sta->lq.agg_time_limit),
2709                         lq_sta->lq.agg_disable_start_th,
2710                         lq_sta->lq.agg_frame_cnt_limit);
2711
2712         desc += sprintf(buff+desc,
2713                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2714                         lq_sta->lq.initial_rate_index[0],
2715                         lq_sta->lq.initial_rate_index[1],
2716                         lq_sta->lq.initial_rate_index[2],
2717                         lq_sta->lq.initial_rate_index[3]);
2718
2719         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
2720                 u32 rate = le32_to_cpu(lq_sta->lq.rs_table[i]);
2721                 desc += sprintf(buff+desc,
2722                                 " rate[%d] 0x%X ",
2723                                 i, rate);
2724
2725                 desc += rs_pretty_print_rate(buff+desc, rate);
2726         }
2727
2728         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2729         kfree(buff);
2730         return ret;
2731 }
2732
2733 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2734         .write = rs_sta_dbgfs_scale_table_write,
2735         .read = rs_sta_dbgfs_scale_table_read,
2736         .open = simple_open,
2737         .llseek = default_llseek,
2738 };
2739 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2740                         char __user *user_buf, size_t count, loff_t *ppos)
2741 {
2742         char *buff;
2743         int desc = 0;
2744         int i, j;
2745         ssize_t ret;
2746         struct iwl_scale_tbl_info *tbl;
2747         struct iwl_lq_sta *lq_sta = file->private_data;
2748
2749         buff = kmalloc(1024, GFP_KERNEL);
2750         if (!buff)
2751                 return -ENOMEM;
2752
2753         for (i = 0; i < LQ_SIZE; i++) {
2754                 tbl = &(lq_sta->lq_info[i]);
2755                 desc += sprintf(buff+desc,
2756                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
2757                                 "rate=0x%X\n",
2758                                 lq_sta->active_tbl == i ? "*" : "x",
2759                                 tbl->lq_type,
2760                                 tbl->is_SGI,
2761                                 is_ht20(tbl) ? "20Mhz" :
2762                                 is_ht40(tbl) ? "40Mhz" :
2763                                 is_ht80(tbl) ? "80Mhz" : "ERR",
2764                                 tbl->current_rate);
2765                 for (j = 0; j < IWL_RATE_COUNT; j++) {
2766                         desc += sprintf(buff+desc,
2767                                 "counter=%d success=%d %%=%d\n",
2768                                 tbl->win[j].counter,
2769                                 tbl->win[j].success_counter,
2770                                 tbl->win[j].success_ratio);
2771                 }
2772         }
2773         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2774         kfree(buff);
2775         return ret;
2776 }
2777
2778 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2779         .read = rs_sta_dbgfs_stats_table_read,
2780         .open = simple_open,
2781         .llseek = default_llseek,
2782 };
2783
2784 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
2785 {
2786         struct iwl_lq_sta *lq_sta = mvm_sta;
2787         lq_sta->rs_sta_dbgfs_scale_table_file =
2788                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
2789                                     lq_sta, &rs_sta_dbgfs_scale_table_ops);
2790         lq_sta->rs_sta_dbgfs_stats_table_file =
2791                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
2792                                     lq_sta, &rs_sta_dbgfs_stats_table_ops);
2793         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2794                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
2795                                   &lq_sta->tx_agg_tid_en);
2796 }
2797
2798 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
2799 {
2800         struct iwl_lq_sta *lq_sta = mvm_sta;
2801         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2802         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2803         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2804 }
2805 #endif
2806
2807 /*
2808  * Initialization of rate scaling information is done by driver after
2809  * the station is added. Since mac80211 calls this function before a
2810  * station is added we ignore it.
2811  */
2812 static void rs_rate_init_stub(void *mvm_r,
2813                               struct ieee80211_supported_band *sband,
2814                               struct cfg80211_chan_def *chandef,
2815                               struct ieee80211_sta *sta, void *mvm_sta)
2816 {
2817 }
2818 static struct rate_control_ops rs_mvm_ops = {
2819         .module = NULL,
2820         .name = RS_NAME,
2821         .tx_status = rs_tx_status,
2822         .get_rate = rs_get_rate,
2823         .rate_init = rs_rate_init_stub,
2824         .alloc = rs_alloc,
2825         .free = rs_free,
2826         .alloc_sta = rs_alloc_sta,
2827         .free_sta = rs_free_sta,
2828         .rate_update = rs_rate_update,
2829 #ifdef CONFIG_MAC80211_DEBUGFS
2830         .add_sta_debugfs = rs_add_debugfs,
2831         .remove_sta_debugfs = rs_remove_debugfs,
2832 #endif
2833 };
2834
2835 int iwl_mvm_rate_control_register(void)
2836 {
2837         return ieee80211_rate_control_register(&rs_mvm_ops);
2838 }
2839
2840 void iwl_mvm_rate_control_unregister(void)
2841 {
2842         ieee80211_rate_control_unregister(&rs_mvm_ops);
2843 }
2844
2845 /**
2846  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
2847  * Tx protection, according to this rquest and previous requests,
2848  * and send the LQ command.
2849  * @mvmsta: The station
2850  * @enable: Enable Tx protection?
2851  */
2852 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
2853                           bool enable)
2854 {
2855         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
2856
2857         lockdep_assert_held(&mvm->mutex);
2858
2859         if (enable) {
2860                 if (mvmsta->tx_protection == 0)
2861                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
2862                 mvmsta->tx_protection++;
2863         } else {
2864                 mvmsta->tx_protection--;
2865                 if (mvmsta->tx_protection == 0)
2866                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
2867         }
2868
2869         return iwl_mvm_send_lq_cmd(mvm, lq, false);
2870 }