1// SPDX-License-Identifier: GPL-2.0-only 2/****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014, 2018 - 2020 Intel Corporation. All rights reserved. 5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 7 * 8 * Contact Information: 9 * Intel Linux Wireless <linuxwifi@intel.com> 10 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 11 * 12 *****************************************************************************/ 13#include <linux/kernel.h> 14#include <linux/skbuff.h> 15#include <linux/slab.h> 16#include <net/mac80211.h> 17 18#include <linux/netdevice.h> 19#include <linux/etherdevice.h> 20#include <linux/delay.h> 21 22#include <linux/workqueue.h> 23#include "rs.h" 24#include "fw-api.h" 25#include "sta.h" 26#include "iwl-op-mode.h" 27#include "mvm.h" 28#include "debugfs.h" 29 30#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 31 32/* Calculations of success ratio are done in fixed point where 12800 is 100%. 33 * Use this macro when dealing with thresholds consts set as a percentage 34 */ 35#define RS_PERCENT(x) (128 * x) 36 37static u8 rs_ht_to_legacy[] = { 38 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 39 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 40 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 41 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 42 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 43 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 44 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 45 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 46 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 47 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 48}; 49 50static const u8 ant_toggle_lookup[] = { 51 [ANT_NONE] = ANT_NONE, 52 [ANT_A] = ANT_B, 53 [ANT_B] = ANT_A, 54 [ANT_AB] = ANT_AB, 55}; 56 57#define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 58 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 59 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 60 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 61 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 62 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 63 IWL_RATE_##rp##M_INDEX, \ 64 IWL_RATE_##rn##M_INDEX } 65 66#define IWL_DECLARE_MCS_RATE(s) \ 67 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 68 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 69 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 70 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 71 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 72 IWL_RATE_INVM_INDEX, \ 73 IWL_RATE_INVM_INDEX } 74 75/* 76 * Parameter order: 77 * rate, ht rate, prev rate, next rate 78 * 79 * If there isn't a valid next or previous rate then INV is used which 80 * maps to IWL_RATE_INVALID 81 * 82 */ 83static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 84 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 85 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 86 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 87 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 88 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 89 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 90 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 91 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 92 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 93 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 94 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 95 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 96 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 97 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 98 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 99}; 100 101enum rs_action { 102 RS_ACTION_STAY = 0, 103 RS_ACTION_DOWNSCALE = -1, 104 RS_ACTION_UPSCALE = 1, 105}; 106 107enum rs_column_mode { 108 RS_INVALID = 0, 109 RS_LEGACY, 110 RS_SISO, 111 RS_MIMO2, 112}; 113 114#define MAX_NEXT_COLUMNS 7 115#define MAX_COLUMN_CHECKS 3 116 117struct rs_tx_column; 118 119typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 120 struct ieee80211_sta *sta, 121 struct rs_rate *rate, 122 const struct rs_tx_column *next_col); 123 124struct rs_tx_column { 125 enum rs_column_mode mode; 126 u8 ant; 127 bool sgi; 128 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 129 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 130}; 131 132static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 133 struct rs_rate *rate, 134 const struct rs_tx_column *next_col) 135{ 136 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 137} 138 139static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 140 struct rs_rate *rate, 141 const struct rs_tx_column *next_col) 142{ 143 if (!sta->ht_cap.ht_supported) 144 return false; 145 146 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 147 return false; 148 149 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 150 return false; 151 152 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 153 return false; 154 155 if (mvm->nvm_data->sku_cap_mimo_disabled) 156 return false; 157 158 return true; 159} 160 161static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 162 struct rs_rate *rate, 163 const struct rs_tx_column *next_col) 164{ 165 if (!sta->ht_cap.ht_supported) 166 return false; 167 168 return true; 169} 170 171static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 172 struct rs_rate *rate, 173 const struct rs_tx_column *next_col) 174{ 175 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 176 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 177 178 if (is_ht20(rate) && (ht_cap->cap & 179 IEEE80211_HT_CAP_SGI_20)) 180 return true; 181 if (is_ht40(rate) && (ht_cap->cap & 182 IEEE80211_HT_CAP_SGI_40)) 183 return true; 184 if (is_ht80(rate) && (vht_cap->cap & 185 IEEE80211_VHT_CAP_SHORT_GI_80)) 186 return true; 187 if (is_ht160(rate) && (vht_cap->cap & 188 IEEE80211_VHT_CAP_SHORT_GI_160)) 189 return true; 190 191 return false; 192} 193 194static const struct rs_tx_column rs_tx_columns[] = { 195 [RS_COLUMN_LEGACY_ANT_A] = { 196 .mode = RS_LEGACY, 197 .ant = ANT_A, 198 .next_columns = { 199 RS_COLUMN_LEGACY_ANT_B, 200 RS_COLUMN_SISO_ANT_A, 201 RS_COLUMN_MIMO2, 202 RS_COLUMN_INVALID, 203 RS_COLUMN_INVALID, 204 RS_COLUMN_INVALID, 205 RS_COLUMN_INVALID, 206 }, 207 .checks = { 208 rs_ant_allow, 209 }, 210 }, 211 [RS_COLUMN_LEGACY_ANT_B] = { 212 .mode = RS_LEGACY, 213 .ant = ANT_B, 214 .next_columns = { 215 RS_COLUMN_LEGACY_ANT_A, 216 RS_COLUMN_SISO_ANT_B, 217 RS_COLUMN_MIMO2, 218 RS_COLUMN_INVALID, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 RS_COLUMN_INVALID, 222 }, 223 .checks = { 224 rs_ant_allow, 225 }, 226 }, 227 [RS_COLUMN_SISO_ANT_A] = { 228 .mode = RS_SISO, 229 .ant = ANT_A, 230 .next_columns = { 231 RS_COLUMN_SISO_ANT_B, 232 RS_COLUMN_MIMO2, 233 RS_COLUMN_SISO_ANT_A_SGI, 234 RS_COLUMN_LEGACY_ANT_A, 235 RS_COLUMN_LEGACY_ANT_B, 236 RS_COLUMN_INVALID, 237 RS_COLUMN_INVALID, 238 }, 239 .checks = { 240 rs_siso_allow, 241 rs_ant_allow, 242 }, 243 }, 244 [RS_COLUMN_SISO_ANT_B] = { 245 .mode = RS_SISO, 246 .ant = ANT_B, 247 .next_columns = { 248 RS_COLUMN_SISO_ANT_A, 249 RS_COLUMN_MIMO2, 250 RS_COLUMN_SISO_ANT_B_SGI, 251 RS_COLUMN_LEGACY_ANT_A, 252 RS_COLUMN_LEGACY_ANT_B, 253 RS_COLUMN_INVALID, 254 RS_COLUMN_INVALID, 255 }, 256 .checks = { 257 rs_siso_allow, 258 rs_ant_allow, 259 }, 260 }, 261 [RS_COLUMN_SISO_ANT_A_SGI] = { 262 .mode = RS_SISO, 263 .ant = ANT_A, 264 .sgi = true, 265 .next_columns = { 266 RS_COLUMN_SISO_ANT_B_SGI, 267 RS_COLUMN_MIMO2_SGI, 268 RS_COLUMN_SISO_ANT_A, 269 RS_COLUMN_LEGACY_ANT_A, 270 RS_COLUMN_LEGACY_ANT_B, 271 RS_COLUMN_INVALID, 272 RS_COLUMN_INVALID, 273 }, 274 .checks = { 275 rs_siso_allow, 276 rs_ant_allow, 277 rs_sgi_allow, 278 }, 279 }, 280 [RS_COLUMN_SISO_ANT_B_SGI] = { 281 .mode = RS_SISO, 282 .ant = ANT_B, 283 .sgi = true, 284 .next_columns = { 285 RS_COLUMN_SISO_ANT_A_SGI, 286 RS_COLUMN_MIMO2_SGI, 287 RS_COLUMN_SISO_ANT_B, 288 RS_COLUMN_LEGACY_ANT_A, 289 RS_COLUMN_LEGACY_ANT_B, 290 RS_COLUMN_INVALID, 291 RS_COLUMN_INVALID, 292 }, 293 .checks = { 294 rs_siso_allow, 295 rs_ant_allow, 296 rs_sgi_allow, 297 }, 298 }, 299 [RS_COLUMN_MIMO2] = { 300 .mode = RS_MIMO2, 301 .ant = ANT_AB, 302 .next_columns = { 303 RS_COLUMN_SISO_ANT_A, 304 RS_COLUMN_MIMO2_SGI, 305 RS_COLUMN_LEGACY_ANT_A, 306 RS_COLUMN_LEGACY_ANT_B, 307 RS_COLUMN_INVALID, 308 RS_COLUMN_INVALID, 309 RS_COLUMN_INVALID, 310 }, 311 .checks = { 312 rs_mimo_allow, 313 }, 314 }, 315 [RS_COLUMN_MIMO2_SGI] = { 316 .mode = RS_MIMO2, 317 .ant = ANT_AB, 318 .sgi = true, 319 .next_columns = { 320 RS_COLUMN_SISO_ANT_A_SGI, 321 RS_COLUMN_MIMO2, 322 RS_COLUMN_LEGACY_ANT_A, 323 RS_COLUMN_LEGACY_ANT_B, 324 RS_COLUMN_INVALID, 325 RS_COLUMN_INVALID, 326 RS_COLUMN_INVALID, 327 }, 328 .checks = { 329 rs_mimo_allow, 330 rs_sgi_allow, 331 }, 332 }, 333}; 334 335static inline u8 rs_extract_rate(u32 rate_n_flags) 336{ 337 /* also works for HT because bits 7:6 are zero there */ 338 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 339} 340 341static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 342{ 343 int idx = 0; 344 345 if (rate_n_flags & RATE_MCS_HT_MSK) { 346 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 347 idx += IWL_RATE_MCS_0_INDEX; 348 349 /* skip 9M not supported in HT*/ 350 if (idx >= IWL_RATE_9M_INDEX) 351 idx += 1; 352 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 353 return idx; 354 } else if (rate_n_flags & RATE_MCS_VHT_MSK || 355 rate_n_flags & RATE_MCS_HE_MSK) { 356 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 357 idx += IWL_RATE_MCS_0_INDEX; 358 359 /* skip 9M not supported in VHT*/ 360 if (idx >= IWL_RATE_9M_INDEX) 361 idx++; 362 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 363 return idx; 364 if ((rate_n_flags & RATE_MCS_HE_MSK) && 365 (idx <= IWL_LAST_HE_RATE)) 366 return idx; 367 } else { 368 /* legacy rate format, search for match in table */ 369 370 u8 legacy_rate = rs_extract_rate(rate_n_flags); 371 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 372 if (iwl_rates[idx].plcp == legacy_rate) 373 return idx; 374 } 375 376 return IWL_RATE_INVALID; 377} 378 379static void rs_rate_scale_perform(struct iwl_mvm *mvm, 380 struct ieee80211_sta *sta, 381 struct iwl_lq_sta *lq_sta, 382 int tid, bool ndp); 383static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 384 struct ieee80211_sta *sta, 385 struct iwl_lq_sta *lq_sta, 386 const struct rs_rate *initial_rate); 387static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 388 389/** 390 * The following tables contain the expected throughput metrics for all rates 391 * 392 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 393 * 394 * where invalid entries are zeros. 395 * 396 * CCK rates are only valid in legacy table and will only be used in G 397 * (2.4 GHz) band. 398 */ 399 400static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 401 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 402}; 403 404/* Expected TpT tables. 4 indexes: 405 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 406 */ 407static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 408 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 409 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 410 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 411 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 412}; 413 414static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 415 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 416 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 417 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 418 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 419}; 420 421static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 422 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 423 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 424 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 425 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 426}; 427 428static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 429 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 430 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 431 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 432 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 433}; 434 435static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 436 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 437 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 438 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 439 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 440}; 441 442static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 443 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 444 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 445 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 446 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 447}; 448 449static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 450 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 451 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 452 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 453 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 454}; 455 456static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 457 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 458 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 459 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 460 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 461}; 462 463/* mbps, mcs */ 464static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 465 { "1", "BPSK DSSS"}, 466 { "2", "QPSK DSSS"}, 467 {"5.5", "BPSK CCK"}, 468 { "11", "QPSK CCK"}, 469 { "6", "BPSK 1/2"}, 470 { "9", "BPSK 1/2"}, 471 { "12", "QPSK 1/2"}, 472 { "18", "QPSK 3/4"}, 473 { "24", "16QAM 1/2"}, 474 { "36", "16QAM 3/4"}, 475 { "48", "64QAM 2/3"}, 476 { "54", "64QAM 3/4"}, 477 { "60", "64QAM 5/6"}, 478}; 479 480#define MCS_INDEX_PER_STREAM (8) 481 482static const char *rs_pretty_ant(u8 ant) 483{ 484 static const char * const ant_name[] = { 485 [ANT_NONE] = "None", 486 [ANT_A] = "A", 487 [ANT_B] = "B", 488 [ANT_AB] = "AB", 489 [ANT_C] = "C", 490 [ANT_AC] = "AC", 491 [ANT_BC] = "BC", 492 [ANT_ABC] = "ABC", 493 }; 494 495 if (ant > ANT_ABC) 496 return "UNKNOWN"; 497 498 return ant_name[ant]; 499} 500 501static const char *rs_pretty_lq_type(enum iwl_table_type type) 502{ 503 static const char * const lq_types[] = { 504 [LQ_NONE] = "NONE", 505 [LQ_LEGACY_A] = "LEGACY_A", 506 [LQ_LEGACY_G] = "LEGACY_G", 507 [LQ_HT_SISO] = "HT SISO", 508 [LQ_HT_MIMO2] = "HT MIMO", 509 [LQ_VHT_SISO] = "VHT SISO", 510 [LQ_VHT_MIMO2] = "VHT MIMO", 511 [LQ_HE_SISO] = "HE SISO", 512 [LQ_HE_MIMO2] = "HE MIMO", 513 }; 514 515 if (type < LQ_NONE || type >= LQ_MAX) 516 return "UNKNOWN"; 517 518 return lq_types[type]; 519} 520 521static char *rs_pretty_rate(const struct rs_rate *rate) 522{ 523 static char buf[40]; 524 static const char * const legacy_rates[] = { 525 [IWL_RATE_1M_INDEX] = "1M", 526 [IWL_RATE_2M_INDEX] = "2M", 527 [IWL_RATE_5M_INDEX] = "5.5M", 528 [IWL_RATE_11M_INDEX] = "11M", 529 [IWL_RATE_6M_INDEX] = "6M", 530 [IWL_RATE_9M_INDEX] = "9M", 531 [IWL_RATE_12M_INDEX] = "12M", 532 [IWL_RATE_18M_INDEX] = "18M", 533 [IWL_RATE_24M_INDEX] = "24M", 534 [IWL_RATE_36M_INDEX] = "36M", 535 [IWL_RATE_48M_INDEX] = "48M", 536 [IWL_RATE_54M_INDEX] = "54M", 537 }; 538 static const char *const ht_vht_rates[] = { 539 [IWL_RATE_MCS_0_INDEX] = "MCS0", 540 [IWL_RATE_MCS_1_INDEX] = "MCS1", 541 [IWL_RATE_MCS_2_INDEX] = "MCS2", 542 [IWL_RATE_MCS_3_INDEX] = "MCS3", 543 [IWL_RATE_MCS_4_INDEX] = "MCS4", 544 [IWL_RATE_MCS_5_INDEX] = "MCS5", 545 [IWL_RATE_MCS_6_INDEX] = "MCS6", 546 [IWL_RATE_MCS_7_INDEX] = "MCS7", 547 [IWL_RATE_MCS_8_INDEX] = "MCS8", 548 [IWL_RATE_MCS_9_INDEX] = "MCS9", 549 }; 550 const char *rate_str; 551 552 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 553 rate_str = legacy_rates[rate->index]; 554 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 555 (rate->index >= IWL_RATE_MCS_0_INDEX) && 556 (rate->index <= IWL_RATE_MCS_9_INDEX)) 557 rate_str = ht_vht_rates[rate->index]; 558 else 559 rate_str = "BAD_RATE"; 560 561 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 562 rs_pretty_ant(rate->ant), rate_str); 563 return buf; 564} 565 566static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 567 const char *prefix) 568{ 569 IWL_DEBUG_RATE(mvm, 570 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 571 prefix, rs_pretty_rate(rate), rate->bw, 572 rate->sgi, rate->ldpc, rate->stbc); 573} 574 575static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 576{ 577 window->data = 0; 578 window->success_counter = 0; 579 window->success_ratio = IWL_INVALID_VALUE; 580 window->counter = 0; 581 window->average_tpt = IWL_INVALID_VALUE; 582} 583 584static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 585 struct iwl_scale_tbl_info *tbl) 586{ 587 int i; 588 589 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 590 for (i = 0; i < IWL_RATE_COUNT; i++) 591 rs_rate_scale_clear_window(&tbl->win[i]); 592 593 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 594 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 595} 596 597static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 598{ 599 return (ant_type & valid_antenna) == ant_type; 600} 601 602static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 603 struct iwl_lq_sta *lq_data, u8 tid, 604 struct ieee80211_sta *sta) 605{ 606 int ret; 607 608 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 609 sta->addr, tid); 610 611 /* start BA session until the peer sends del BA */ 612 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 613 if (ret == -EAGAIN) { 614 /* 615 * driver and mac80211 is out of sync 616 * this might be cause by reloading firmware 617 * stop the tx ba session here 618 */ 619 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 620 tid); 621 ieee80211_stop_tx_ba_session(sta, tid); 622 } 623 return ret; 624} 625 626static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 627 u8 tid, struct iwl_lq_sta *lq_sta, 628 struct ieee80211_sta *sta) 629{ 630 struct iwl_mvm_tid_data *tid_data; 631 632 /* 633 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 634 * when the frame is not QoS 635 */ 636 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 637 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 638 tid, IWL_MAX_TID_COUNT); 639 return; 640 } else if (tid == IWL_MAX_TID_COUNT) { 641 return; 642 } 643 644 tid_data = &mvmsta->tid_data[tid]; 645 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 646 tid_data->state == IWL_AGG_OFF && 647 (lq_sta->tx_agg_tid_en & BIT(tid)) && 648 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 649 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 650 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 651 tid_data->state = IWL_AGG_QUEUED; 652 } 653} 654 655static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 656{ 657 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 658 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 659 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 660} 661 662/* 663 * Static function to get the expected throughput from an iwl_scale_tbl_info 664 * that wraps a NULL pointer check 665 */ 666static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 667{ 668 if (tbl->expected_tpt) 669 return tbl->expected_tpt[rs_index]; 670 return 0; 671} 672 673/** 674 * rs_collect_tx_data - Update the success/failure sliding window 675 * 676 * We keep a sliding window of the last 62 packets transmitted 677 * at this rate. window->data contains the bitmask of successful 678 * packets. 679 */ 680static int _rs_collect_tx_data(struct iwl_mvm *mvm, 681 struct iwl_scale_tbl_info *tbl, 682 int scale_index, int attempts, int successes, 683 struct iwl_rate_scale_data *window) 684{ 685 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 686 s32 fail_count, tpt; 687 688 /* Get expected throughput */ 689 tpt = get_expected_tpt(tbl, scale_index); 690 691 /* 692 * Keep track of only the latest 62 tx frame attempts in this rate's 693 * history window; anything older isn't really relevant any more. 694 * If we have filled up the sliding window, drop the oldest attempt; 695 * if the oldest attempt (highest bit in bitmap) shows "success", 696 * subtract "1" from the success counter (this is the main reason 697 * we keep these bitmaps!). 698 */ 699 while (attempts > 0) { 700 if (window->counter >= IWL_RATE_MAX_WINDOW) { 701 /* remove earliest */ 702 window->counter = IWL_RATE_MAX_WINDOW - 1; 703 704 if (window->data & mask) { 705 window->data &= ~mask; 706 window->success_counter--; 707 } 708 } 709 710 /* Increment frames-attempted counter */ 711 window->counter++; 712 713 /* Shift bitmap by one frame to throw away oldest history */ 714 window->data <<= 1; 715 716 /* Mark the most recent #successes attempts as successful */ 717 if (successes > 0) { 718 window->success_counter++; 719 window->data |= 0x1; 720 successes--; 721 } 722 723 attempts--; 724 } 725 726 /* Calculate current success ratio, avoid divide-by-0! */ 727 if (window->counter > 0) 728 window->success_ratio = 128 * (100 * window->success_counter) 729 / window->counter; 730 else 731 window->success_ratio = IWL_INVALID_VALUE; 732 733 fail_count = window->counter - window->success_counter; 734 735 /* Calculate average throughput, if we have enough history. */ 736 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 737 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 738 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 739 else 740 window->average_tpt = IWL_INVALID_VALUE; 741 742 return 0; 743} 744 745static int rs_collect_tpc_data(struct iwl_mvm *mvm, 746 struct iwl_lq_sta *lq_sta, 747 struct iwl_scale_tbl_info *tbl, 748 int scale_index, int attempts, int successes, 749 u8 reduced_txp) 750{ 751 struct iwl_rate_scale_data *window = NULL; 752 753 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 754 return -EINVAL; 755 756 window = &tbl->tpc_win[reduced_txp]; 757 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 758 window); 759} 760 761static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 762 struct iwl_mvm_sta *mvmsta, 763 u8 tid, int successes) 764{ 765 struct iwl_mvm_tid_data *tid_data; 766 767 if (tid >= IWL_MAX_TID_COUNT) 768 return; 769 770 tid_data = &mvmsta->tid_data[tid]; 771 772 /* 773 * Measure if there're enough successful transmits per second. 774 * These statistics are used only to decide if we can start a 775 * BA session, so it should be updated only when A-MPDU is 776 * off. 777 */ 778 if (tid_data->state != IWL_AGG_OFF) 779 return; 780 781 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 782 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 783 tid_data->tx_count_last = tid_data->tx_count; 784 tid_data->tx_count = 0; 785 tid_data->tpt_meas_start = jiffies; 786 } else { 787 tid_data->tx_count += successes; 788 } 789} 790 791static int rs_collect_tlc_data(struct iwl_mvm *mvm, 792 struct iwl_mvm_sta *mvmsta, u8 tid, 793 struct iwl_scale_tbl_info *tbl, 794 int scale_index, int attempts, int successes) 795{ 796 struct iwl_rate_scale_data *window = NULL; 797 798 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 799 return -EINVAL; 800 801 if (tbl->column != RS_COLUMN_INVALID) { 802 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 803 804 pers->tx_stats[tbl->column][scale_index].total += attempts; 805 pers->tx_stats[tbl->column][scale_index].success += successes; 806 } 807 808 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 809 810 /* Select window for current tx bit rate */ 811 window = &(tbl->win[scale_index]); 812 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 813 window); 814} 815 816/* Convert rs_rate object into ucode rate bitmask */ 817static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 818 struct rs_rate *rate) 819{ 820 u32 ucode_rate = 0; 821 int index = rate->index; 822 823 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 824 RATE_MCS_ANT_ABC_MSK); 825 826 if (is_legacy(rate)) { 827 ucode_rate |= iwl_rates[index].plcp; 828 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 829 ucode_rate |= RATE_MCS_CCK_MSK; 830 return ucode_rate; 831 } 832 833 /* set RTS protection for all non legacy rates 834 * This helps with congested environments reducing the conflict cost to 835 * RTS retries only, instead of the entire BA packet. 836 */ 837 ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK; 838 839 if (is_ht(rate)) { 840 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 841 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 842 index = IWL_LAST_HT_RATE; 843 } 844 ucode_rate |= RATE_MCS_HT_MSK; 845 846 if (is_ht_siso(rate)) 847 ucode_rate |= iwl_rates[index].plcp_ht_siso; 848 else if (is_ht_mimo2(rate)) 849 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 850 else 851 WARN_ON_ONCE(1); 852 } else if (is_vht(rate)) { 853 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 854 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 855 index = IWL_LAST_VHT_RATE; 856 } 857 ucode_rate |= RATE_MCS_VHT_MSK; 858 if (is_vht_siso(rate)) 859 ucode_rate |= iwl_rates[index].plcp_vht_siso; 860 else if (is_vht_mimo2(rate)) 861 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 862 else 863 WARN_ON_ONCE(1); 864 865 } else { 866 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 867 } 868 869 if (is_siso(rate) && rate->stbc) { 870 /* To enable STBC we need to set both a flag and ANT_AB */ 871 ucode_rate |= RATE_MCS_ANT_AB_MSK; 872 ucode_rate |= RATE_MCS_STBC_MSK; 873 } 874 875 ucode_rate |= rate->bw; 876 if (rate->sgi) 877 ucode_rate |= RATE_MCS_SGI_MSK; 878 if (rate->ldpc) 879 ucode_rate |= RATE_MCS_LDPC_MSK; 880 881 return ucode_rate; 882} 883 884/* Convert a ucode rate into an rs_rate object */ 885static int rs_rate_from_ucode_rate(const u32 ucode_rate, 886 enum nl80211_band band, 887 struct rs_rate *rate) 888{ 889 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 890 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 891 u8 nss; 892 893 memset(rate, 0, sizeof(*rate)); 894 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 895 896 if (rate->index == IWL_RATE_INVALID) 897 return -EINVAL; 898 899 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 900 901 /* Legacy */ 902 if (!(ucode_rate & RATE_MCS_HT_MSK) && 903 !(ucode_rate & RATE_MCS_VHT_MSK) && 904 !(ucode_rate & RATE_MCS_HE_MSK)) { 905 if (num_of_ant == 1) { 906 if (band == NL80211_BAND_5GHZ) 907 rate->type = LQ_LEGACY_A; 908 else 909 rate->type = LQ_LEGACY_G; 910 } 911 912 return 0; 913 } 914 915 /* HT, VHT or HE */ 916 if (ucode_rate & RATE_MCS_SGI_MSK) 917 rate->sgi = true; 918 if (ucode_rate & RATE_MCS_LDPC_MSK) 919 rate->ldpc = true; 920 if (ucode_rate & RATE_MCS_STBC_MSK) 921 rate->stbc = true; 922 if (ucode_rate & RATE_MCS_BF_MSK) 923 rate->bfer = true; 924 925 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 926 927 if (ucode_rate & RATE_MCS_HT_MSK) { 928 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 929 RATE_HT_MCS_NSS_POS) + 1; 930 931 if (nss == 1) { 932 rate->type = LQ_HT_SISO; 933 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 934 "stbc %d bfer %d", 935 rate->stbc, rate->bfer); 936 } else if (nss == 2) { 937 rate->type = LQ_HT_MIMO2; 938 WARN_ON_ONCE(num_of_ant != 2); 939 } else { 940 WARN_ON_ONCE(1); 941 } 942 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 943 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 944 RATE_VHT_MCS_NSS_POS) + 1; 945 946 if (nss == 1) { 947 rate->type = LQ_VHT_SISO; 948 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 949 "stbc %d bfer %d", 950 rate->stbc, rate->bfer); 951 } else if (nss == 2) { 952 rate->type = LQ_VHT_MIMO2; 953 WARN_ON_ONCE(num_of_ant != 2); 954 } else { 955 WARN_ON_ONCE(1); 956 } 957 } else if (ucode_rate & RATE_MCS_HE_MSK) { 958 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 959 RATE_VHT_MCS_NSS_POS) + 1; 960 961 if (nss == 1) { 962 rate->type = LQ_HE_SISO; 963 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 964 "stbc %d bfer %d", rate->stbc, rate->bfer); 965 } else if (nss == 2) { 966 rate->type = LQ_HE_MIMO2; 967 WARN_ON_ONCE(num_of_ant != 2); 968 } else { 969 WARN_ON_ONCE(1); 970 } 971 } 972 973 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 974 !is_he(rate) && !is_vht(rate)); 975 976 return 0; 977} 978 979/* switch to another antenna/antennas and return 1 */ 980/* if no other valid antenna found, return 0 */ 981static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 982{ 983 u8 new_ant_type; 984 985 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 986 return 0; 987 988 if (!rs_is_valid_ant(valid_ant, rate->ant)) 989 return 0; 990 991 new_ant_type = ant_toggle_lookup[rate->ant]; 992 993 while ((new_ant_type != rate->ant) && 994 !rs_is_valid_ant(valid_ant, new_ant_type)) 995 new_ant_type = ant_toggle_lookup[new_ant_type]; 996 997 if (new_ant_type == rate->ant) 998 return 0; 999 1000 rate->ant = new_ant_type; 1001 1002 return 1; 1003} 1004 1005static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 1006 struct rs_rate *rate) 1007{ 1008 if (is_legacy(rate)) 1009 return lq_sta->active_legacy_rate; 1010 else if (is_siso(rate)) 1011 return lq_sta->active_siso_rate; 1012 else if (is_mimo2(rate)) 1013 return lq_sta->active_mimo2_rate; 1014 1015 WARN_ON_ONCE(1); 1016 return 0; 1017} 1018 1019static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1020 int rate_type) 1021{ 1022 u8 high = IWL_RATE_INVALID; 1023 u8 low = IWL_RATE_INVALID; 1024 1025 /* 802.11A or ht walks to the next literal adjacent rate in 1026 * the rate table */ 1027 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1028 int i; 1029 u32 mask; 1030 1031 /* Find the previous rate that is in the rate mask */ 1032 i = index - 1; 1033 if (i >= 0) 1034 mask = BIT(i); 1035 for (; i >= 0; i--, mask >>= 1) { 1036 if (rate_mask & mask) { 1037 low = i; 1038 break; 1039 } 1040 } 1041 1042 /* Find the next rate that is in the rate mask */ 1043 i = index + 1; 1044 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1045 if (rate_mask & mask) { 1046 high = i; 1047 break; 1048 } 1049 } 1050 1051 return (high << 8) | low; 1052 } 1053 1054 low = index; 1055 while (low != IWL_RATE_INVALID) { 1056 low = iwl_rates[low].prev_rs; 1057 if (low == IWL_RATE_INVALID) 1058 break; 1059 if (rate_mask & (1 << low)) 1060 break; 1061 } 1062 1063 high = index; 1064 while (high != IWL_RATE_INVALID) { 1065 high = iwl_rates[high].next_rs; 1066 if (high == IWL_RATE_INVALID) 1067 break; 1068 if (rate_mask & (1 << high)) 1069 break; 1070 } 1071 1072 return (high << 8) | low; 1073} 1074 1075static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1076 struct rs_rate *rate) 1077{ 1078 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1079} 1080 1081/* Get the next supported lower rate in the current column. 1082 * Return true if bottom rate in the current column was reached 1083 */ 1084static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1085 struct rs_rate *rate) 1086{ 1087 u8 low; 1088 u16 high_low; 1089 u16 rate_mask; 1090 struct iwl_mvm *mvm = lq_sta->pers.drv; 1091 1092 rate_mask = rs_get_supported_rates(lq_sta, rate); 1093 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1094 rate->type); 1095 low = high_low & 0xff; 1096 1097 /* Bottom rate of column reached */ 1098 if (low == IWL_RATE_INVALID) 1099 return true; 1100 1101 rate->index = low; 1102 return false; 1103} 1104 1105/* Get the next rate to use following a column downgrade */ 1106static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1107 struct rs_rate *rate) 1108{ 1109 struct iwl_mvm *mvm = lq_sta->pers.drv; 1110 1111 if (is_legacy(rate)) { 1112 /* No column to downgrade from Legacy */ 1113 return; 1114 } else if (is_siso(rate)) { 1115 /* Downgrade to Legacy if we were in SISO */ 1116 if (lq_sta->band == NL80211_BAND_5GHZ) 1117 rate->type = LQ_LEGACY_A; 1118 else 1119 rate->type = LQ_LEGACY_G; 1120 1121 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1122 1123 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1124 rate->index > IWL_RATE_MCS_9_INDEX); 1125 1126 rate->index = rs_ht_to_legacy[rate->index]; 1127 rate->ldpc = false; 1128 } else { 1129 /* Downgrade to SISO with same MCS if in MIMO */ 1130 rate->type = is_vht_mimo2(rate) ? 1131 LQ_VHT_SISO : LQ_HT_SISO; 1132 } 1133 1134 if (num_of_ant(rate->ant) > 1) 1135 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1136 1137 /* Relevant in both switching to SISO or Legacy */ 1138 rate->sgi = false; 1139 1140 if (!rs_rate_supported(lq_sta, rate)) 1141 rs_get_lower_rate_in_column(lq_sta, rate); 1142} 1143 1144/* Check if both rates share the same column */ 1145static inline bool rs_rate_column_match(struct rs_rate *a, 1146 struct rs_rate *b) 1147{ 1148 bool ant_match; 1149 1150 if (a->stbc || a->bfer) 1151 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1152 else 1153 ant_match = (a->ant == b->ant); 1154 1155 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1156 && ant_match; 1157} 1158 1159static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1160{ 1161 if (is_legacy(rate)) { 1162 if (rate->ant == ANT_A) 1163 return RS_COLUMN_LEGACY_ANT_A; 1164 1165 if (rate->ant == ANT_B) 1166 return RS_COLUMN_LEGACY_ANT_B; 1167 1168 goto err; 1169 } 1170 1171 if (is_siso(rate)) { 1172 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1173 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1174 RS_COLUMN_SISO_ANT_A; 1175 1176 if (rate->ant == ANT_B) 1177 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1178 RS_COLUMN_SISO_ANT_B; 1179 1180 goto err; 1181 } 1182 1183 if (is_mimo(rate)) 1184 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1185 1186err: 1187 return RS_COLUMN_INVALID; 1188} 1189 1190static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1191{ 1192 u8 tid = IWL_MAX_TID_COUNT; 1193 1194 if (ieee80211_is_data_qos(hdr->frame_control)) { 1195 u8 *qc = ieee80211_get_qos_ctl(hdr); 1196 tid = qc[0] & 0xf; 1197 } 1198 1199 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1200 tid = IWL_MAX_TID_COUNT; 1201 1202 return tid; 1203} 1204 1205/* 1206 * mac80211 sends us Tx status 1207 */ 1208static void rs_drv_mac80211_tx_status(void *mvm_r, 1209 struct ieee80211_supported_band *sband, 1210 struct ieee80211_sta *sta, void *priv_sta, 1211 struct sk_buff *skb) 1212{ 1213 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1214 struct iwl_op_mode *op_mode = mvm_r; 1215 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1217 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1218 1219 if (!mvmsta->vif) 1220 return; 1221 1222 if (!ieee80211_is_data(hdr->frame_control) || 1223 info->flags & IEEE80211_TX_CTL_NO_ACK) 1224 return; 1225 1226 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1227 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1228} 1229 1230/* 1231 * Begin a period of staying with a selected modulation mode. 1232 * Set "stay_in_tbl" flag to prevent any mode switches. 1233 * Set frame tx success limits according to legacy vs. high-throughput, 1234 * and reset overall (spanning all rates) tx success history statistics. 1235 * These control how long we stay using same modulation mode before 1236 * searching for a new mode. 1237 */ 1238static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1239 struct iwl_lq_sta *lq_sta) 1240{ 1241 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1242 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1243 if (is_legacy) { 1244 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1245 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1246 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1247 } else { 1248 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1249 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1250 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1251 } 1252 lq_sta->table_count = 0; 1253 lq_sta->total_failed = 0; 1254 lq_sta->total_success = 0; 1255 lq_sta->flush_timer = jiffies; 1256 lq_sta->visited_columns = 0; 1257} 1258 1259static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1260{ 1261 if (rate_mask) 1262 return find_last_bit(&rate_mask, BITS_PER_LONG); 1263 return IWL_RATE_INVALID; 1264} 1265 1266static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1267 const struct rs_tx_column *column) 1268{ 1269 switch (column->mode) { 1270 case RS_LEGACY: 1271 return lq_sta->max_legacy_rate_idx; 1272 case RS_SISO: 1273 return lq_sta->max_siso_rate_idx; 1274 case RS_MIMO2: 1275 return lq_sta->max_mimo2_rate_idx; 1276 default: 1277 WARN_ON_ONCE(1); 1278 } 1279 1280 return lq_sta->max_legacy_rate_idx; 1281} 1282 1283static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1284 const struct rs_tx_column *column, 1285 u32 bw) 1286{ 1287 /* Used to choose among HT tables */ 1288 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1289 1290 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1291 column->mode != RS_SISO && 1292 column->mode != RS_MIMO2)) 1293 return expected_tpt_legacy; 1294 1295 /* Legacy rates have only one table */ 1296 if (column->mode == RS_LEGACY) 1297 return expected_tpt_legacy; 1298 1299 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1300 /* Choose among many HT tables depending on number of streams 1301 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1302 * status */ 1303 if (column->mode == RS_SISO) { 1304 switch (bw) { 1305 case RATE_MCS_CHAN_WIDTH_20: 1306 ht_tbl_pointer = expected_tpt_siso_20MHz; 1307 break; 1308 case RATE_MCS_CHAN_WIDTH_40: 1309 ht_tbl_pointer = expected_tpt_siso_40MHz; 1310 break; 1311 case RATE_MCS_CHAN_WIDTH_80: 1312 ht_tbl_pointer = expected_tpt_siso_80MHz; 1313 break; 1314 case RATE_MCS_CHAN_WIDTH_160: 1315 ht_tbl_pointer = expected_tpt_siso_160MHz; 1316 break; 1317 default: 1318 WARN_ON_ONCE(1); 1319 } 1320 } else if (column->mode == RS_MIMO2) { 1321 switch (bw) { 1322 case RATE_MCS_CHAN_WIDTH_20: 1323 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1324 break; 1325 case RATE_MCS_CHAN_WIDTH_40: 1326 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1327 break; 1328 case RATE_MCS_CHAN_WIDTH_80: 1329 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1330 break; 1331 case RATE_MCS_CHAN_WIDTH_160: 1332 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1333 break; 1334 default: 1335 WARN_ON_ONCE(1); 1336 } 1337 } else { 1338 WARN_ON_ONCE(1); 1339 } 1340 1341 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1342 return ht_tbl_pointer[0]; 1343 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1344 return ht_tbl_pointer[1]; 1345 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1346 return ht_tbl_pointer[2]; 1347 else /* AGG+SGI */ 1348 return ht_tbl_pointer[3]; 1349} 1350 1351static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1352 struct iwl_scale_tbl_info *tbl) 1353{ 1354 struct rs_rate *rate = &tbl->rate; 1355 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1356 1357 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1358} 1359 1360/* rs uses two tables, one is active and the second is for searching better 1361 * configuration. This function, according to the index of the currently 1362 * active table returns the search table, which is located at the 1363 * index complementary to 1 according to the active table (active = 1, 1364 * search = 0 or active = 0, search = 1). 1365 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds. 1366 */ 1367static inline u8 rs_search_tbl(u8 active_tbl) 1368{ 1369 return (active_tbl ^ 1) & 1; 1370} 1371 1372static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1373 struct iwl_lq_sta *lq_sta, 1374 struct iwl_scale_tbl_info *tbl, /* "search" */ 1375 unsigned long rate_mask, s8 index) 1376{ 1377 struct iwl_scale_tbl_info *active_tbl = 1378 &(lq_sta->lq_info[lq_sta->active_tbl]); 1379 s32 success_ratio = active_tbl->win[index].success_ratio; 1380 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1381 const u16 *tpt_tbl = tbl->expected_tpt; 1382 u16 high_low; 1383 u32 target_tpt; 1384 int rate_idx; 1385 1386 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1387 target_tpt = 100 * expected_current_tpt; 1388 IWL_DEBUG_RATE(mvm, 1389 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1390 success_ratio, target_tpt); 1391 } else { 1392 target_tpt = lq_sta->last_tpt; 1393 IWL_DEBUG_RATE(mvm, 1394 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1395 success_ratio, target_tpt); 1396 } 1397 1398 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1399 1400 while (rate_idx != IWL_RATE_INVALID) { 1401 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1402 break; 1403 1404 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1405 tbl->rate.type); 1406 1407 rate_idx = (high_low >> 8) & 0xff; 1408 } 1409 1410 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1411 rate_idx, target_tpt, 1412 rate_idx != IWL_RATE_INVALID ? 1413 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1414 1415 return rate_idx; 1416} 1417 1418static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1419{ 1420 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1421 struct ieee80211_vht_cap vht_cap = { 1422 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1423 .supp_mcs = sta_vht_cap->vht_mcs, 1424 }; 1425 1426 switch (sta->bandwidth) { 1427 case IEEE80211_STA_RX_BW_160: 1428 /* 1429 * Don't use 160 MHz if VHT extended NSS support 1430 * says we cannot use 2 streams, we don't want to 1431 * deal with this. 1432 * We only check MCS 0 - they will support that if 1433 * we got here at all and we don't care which MCS, 1434 * we want to determine a more global state. 1435 */ 1436 if (ieee80211_get_vht_max_nss(&vht_cap, 1437 IEEE80211_VHT_CHANWIDTH_160MHZ, 1438 0, true, 1439 sta->rx_nss) < sta->rx_nss) 1440 return RATE_MCS_CHAN_WIDTH_80; 1441 return RATE_MCS_CHAN_WIDTH_160; 1442 case IEEE80211_STA_RX_BW_80: 1443 return RATE_MCS_CHAN_WIDTH_80; 1444 case IEEE80211_STA_RX_BW_40: 1445 return RATE_MCS_CHAN_WIDTH_40; 1446 case IEEE80211_STA_RX_BW_20: 1447 default: 1448 return RATE_MCS_CHAN_WIDTH_20; 1449 } 1450} 1451 1452/* 1453 * Check whether we should continue using same modulation mode, or 1454 * begin search for a new mode, based on: 1455 * 1) # tx successes or failures while using this mode 1456 * 2) # times calling this function 1457 * 3) elapsed time in this mode (not used, for now) 1458 */ 1459static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1460{ 1461 struct iwl_scale_tbl_info *tbl; 1462 int active_tbl; 1463 int flush_interval_passed = 0; 1464 struct iwl_mvm *mvm; 1465 1466 mvm = lq_sta->pers.drv; 1467 active_tbl = lq_sta->active_tbl; 1468 1469 tbl = &(lq_sta->lq_info[active_tbl]); 1470 1471 /* If we've been disallowing search, see if we should now allow it */ 1472 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1473 /* Elapsed time using current modulation mode */ 1474 if (lq_sta->flush_timer) 1475 flush_interval_passed = 1476 time_after(jiffies, 1477 (unsigned long)(lq_sta->flush_timer + 1478 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1479 1480 /* 1481 * Check if we should allow search for new modulation mode. 1482 * If many frames have failed or succeeded, or we've used 1483 * this same modulation for a long time, allow search, and 1484 * reset history stats that keep track of whether we should 1485 * allow a new search. Also (below) reset all bitmaps and 1486 * stats in active history. 1487 */ 1488 if (force_search || 1489 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1490 (lq_sta->total_success > lq_sta->max_success_limit) || 1491 ((!lq_sta->search_better_tbl) && 1492 (lq_sta->flush_timer) && (flush_interval_passed))) { 1493 IWL_DEBUG_RATE(mvm, 1494 "LQ: stay is expired %d %d %d\n", 1495 lq_sta->total_failed, 1496 lq_sta->total_success, 1497 flush_interval_passed); 1498 1499 /* Allow search for new mode */ 1500 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1501 IWL_DEBUG_RATE(mvm, 1502 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1503 lq_sta->total_failed = 0; 1504 lq_sta->total_success = 0; 1505 lq_sta->flush_timer = 0; 1506 /* mark the current column as visited */ 1507 lq_sta->visited_columns = BIT(tbl->column); 1508 /* 1509 * Else if we've used this modulation mode enough repetitions 1510 * (regardless of elapsed time or success/failure), reset 1511 * history bitmaps and rate-specific stats for all rates in 1512 * active table. 1513 */ 1514 } else { 1515 lq_sta->table_count++; 1516 if (lq_sta->table_count >= 1517 lq_sta->table_count_limit) { 1518 lq_sta->table_count = 0; 1519 1520 IWL_DEBUG_RATE(mvm, 1521 "LQ: stay in table clear win\n"); 1522 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1523 } 1524 } 1525 1526 /* If transitioning to allow "search", reset all history 1527 * bitmaps and stats in active table (this will become the new 1528 * "search" table). */ 1529 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1530 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1531 } 1532 } 1533} 1534 1535static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1536 struct iwl_scale_tbl_info *tbl, 1537 enum rs_action scale_action) 1538{ 1539 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1540 int i; 1541 1542 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta); 1543 1544 /* 1545 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1546 * or 0, since there is no per-TID alg. 1547 */ 1548 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1549 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1550 scale_action == RS_ACTION_DOWNSCALE) 1551 mvmsta->amsdu_enabled = 0; 1552 else 1553 mvmsta->amsdu_enabled = 0xFFFF; 1554 1555 if (mvmsta->vif->bss_conf.he_support && 1556 !iwlwifi_mod_params.disable_11ax) 1557 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1558 else 1559 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1560 1561 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1562 1563 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1564 if (mvmsta->amsdu_enabled) 1565 sta->max_tid_amsdu_len[i] = 1566 iwl_mvm_max_amsdu_size(mvm, sta, i); 1567 else 1568 /* 1569 * Not so elegant, but this will effectively 1570 * prevent AMSDU on this TID 1571 */ 1572 sta->max_tid_amsdu_len[i] = 1; 1573 } 1574} 1575 1576/* 1577 * setup rate table in uCode 1578 */ 1579static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1580 struct ieee80211_sta *sta, 1581 struct iwl_lq_sta *lq_sta, 1582 struct iwl_scale_tbl_info *tbl) 1583{ 1584 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1585 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 1586} 1587 1588static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1589 struct ieee80211_sta *sta, 1590 struct iwl_lq_sta *lq_sta, 1591 struct iwl_scale_tbl_info *tbl, 1592 enum rs_action scale_action) 1593{ 1594 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1595 return false; 1596 1597 if (!is_vht_siso(&tbl->rate)) 1598 return false; 1599 1600 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1601 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1602 (scale_action == RS_ACTION_DOWNSCALE)) { 1603 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1604 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1605 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1606 goto tweaked; 1607 } 1608 1609 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1610 * sustainable, i.e. we're past the test window. We can't go back 1611 * if MCS5 is just tested as this will happen always after switching 1612 * to 20Mhz MCS4 because the rate stats are cleared. 1613 */ 1614 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1615 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1616 (scale_action == RS_ACTION_STAY)) || 1617 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1618 (scale_action == RS_ACTION_UPSCALE)))) { 1619 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1620 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1621 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1622 goto tweaked; 1623 } 1624 1625 return false; 1626 1627tweaked: 1628 rs_set_expected_tpt_table(lq_sta, tbl); 1629 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1630 return true; 1631} 1632 1633static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1634 struct iwl_lq_sta *lq_sta, 1635 struct ieee80211_sta *sta, 1636 struct iwl_scale_tbl_info *tbl) 1637{ 1638 int i, j, max_rate; 1639 enum rs_column next_col_id; 1640 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1641 const struct rs_tx_column *next_col; 1642 allow_column_func_t allow_func; 1643 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1644 const u16 *expected_tpt_tbl; 1645 u16 tpt, max_expected_tpt; 1646 1647 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1648 next_col_id = curr_col->next_columns[i]; 1649 1650 if (next_col_id == RS_COLUMN_INVALID) 1651 continue; 1652 1653 if (lq_sta->visited_columns & BIT(next_col_id)) { 1654 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1655 next_col_id); 1656 continue; 1657 } 1658 1659 next_col = &rs_tx_columns[next_col_id]; 1660 1661 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1662 IWL_DEBUG_RATE(mvm, 1663 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1664 next_col_id, valid_ants, next_col->ant); 1665 continue; 1666 } 1667 1668 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1669 allow_func = next_col->checks[j]; 1670 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1671 next_col)) 1672 break; 1673 } 1674 1675 if (j != MAX_COLUMN_CHECKS) { 1676 IWL_DEBUG_RATE(mvm, 1677 "Skip column %d: not allowed (check %d failed)\n", 1678 next_col_id, j); 1679 1680 continue; 1681 } 1682 1683 tpt = lq_sta->last_tpt / 100; 1684 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1685 rs_bw_from_sta_bw(sta)); 1686 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1687 continue; 1688 1689 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1690 if (max_rate == IWL_RATE_INVALID) { 1691 IWL_DEBUG_RATE(mvm, 1692 "Skip column %d: no rate is allowed in this column\n", 1693 next_col_id); 1694 continue; 1695 } 1696 1697 max_expected_tpt = expected_tpt_tbl[max_rate]; 1698 if (tpt >= max_expected_tpt) { 1699 IWL_DEBUG_RATE(mvm, 1700 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1701 next_col_id, max_expected_tpt, tpt); 1702 continue; 1703 } 1704 1705 IWL_DEBUG_RATE(mvm, 1706 "Found potential column %d. Max expected %d current %d\n", 1707 next_col_id, max_expected_tpt, tpt); 1708 break; 1709 } 1710 1711 if (i == MAX_NEXT_COLUMNS) 1712 return RS_COLUMN_INVALID; 1713 1714 return next_col_id; 1715} 1716 1717static int rs_switch_to_column(struct iwl_mvm *mvm, 1718 struct iwl_lq_sta *lq_sta, 1719 struct ieee80211_sta *sta, 1720 enum rs_column col_id) 1721{ 1722 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 1723 struct iwl_scale_tbl_info *search_tbl = 1724 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 1725 struct rs_rate *rate = &search_tbl->rate; 1726 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1727 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1728 unsigned long rate_mask = 0; 1729 u32 rate_idx = 0; 1730 1731 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1732 1733 rate->sgi = column->sgi; 1734 rate->ant = column->ant; 1735 1736 if (column->mode == RS_LEGACY) { 1737 if (lq_sta->band == NL80211_BAND_5GHZ) 1738 rate->type = LQ_LEGACY_A; 1739 else 1740 rate->type = LQ_LEGACY_G; 1741 1742 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1743 rate->ldpc = false; 1744 rate_mask = lq_sta->active_legacy_rate; 1745 } else if (column->mode == RS_SISO) { 1746 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1747 rate_mask = lq_sta->active_siso_rate; 1748 } else if (column->mode == RS_MIMO2) { 1749 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1750 rate_mask = lq_sta->active_mimo2_rate; 1751 } else { 1752 WARN_ONCE(1, "Bad column mode"); 1753 } 1754 1755 if (column->mode != RS_LEGACY) { 1756 rate->bw = rs_bw_from_sta_bw(sta); 1757 rate->ldpc = lq_sta->ldpc; 1758 } 1759 1760 search_tbl->column = col_id; 1761 rs_set_expected_tpt_table(lq_sta, search_tbl); 1762 1763 lq_sta->visited_columns |= BIT(col_id); 1764 1765 /* Get the best matching rate if we're changing modes. e.g. 1766 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1767 */ 1768 if (curr_column->mode != column->mode) { 1769 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1770 rate_mask, rate->index); 1771 1772 if ((rate_idx == IWL_RATE_INVALID) || 1773 !(BIT(rate_idx) & rate_mask)) { 1774 IWL_DEBUG_RATE(mvm, 1775 "can not switch with index %d" 1776 " rate mask %lx\n", 1777 rate_idx, rate_mask); 1778 1779 goto err; 1780 } 1781 1782 rate->index = rate_idx; 1783 } 1784 1785 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1786 col_id, rate->index); 1787 1788 return 0; 1789 1790err: 1791 rate->type = LQ_NONE; 1792 return -1; 1793} 1794 1795static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1796 struct iwl_scale_tbl_info *tbl, 1797 s32 sr, int low, int high, 1798 int current_tpt, 1799 int low_tpt, int high_tpt) 1800{ 1801 enum rs_action action = RS_ACTION_STAY; 1802 1803 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1804 (current_tpt == 0)) { 1805 IWL_DEBUG_RATE(mvm, 1806 "Decrease rate because of low SR\n"); 1807 return RS_ACTION_DOWNSCALE; 1808 } 1809 1810 if ((low_tpt == IWL_INVALID_VALUE) && 1811 (high_tpt == IWL_INVALID_VALUE) && 1812 (high != IWL_RATE_INVALID)) { 1813 IWL_DEBUG_RATE(mvm, 1814 "No data about high/low rates. Increase rate\n"); 1815 return RS_ACTION_UPSCALE; 1816 } 1817 1818 if ((high_tpt == IWL_INVALID_VALUE) && 1819 (high != IWL_RATE_INVALID) && 1820 (low_tpt != IWL_INVALID_VALUE) && 1821 (low_tpt < current_tpt)) { 1822 IWL_DEBUG_RATE(mvm, 1823 "No data about high rate and low rate is worse. Increase rate\n"); 1824 return RS_ACTION_UPSCALE; 1825 } 1826 1827 if ((high_tpt != IWL_INVALID_VALUE) && 1828 (high_tpt > current_tpt)) { 1829 IWL_DEBUG_RATE(mvm, 1830 "Higher rate is better. Increate rate\n"); 1831 return RS_ACTION_UPSCALE; 1832 } 1833 1834 if ((low_tpt != IWL_INVALID_VALUE) && 1835 (high_tpt != IWL_INVALID_VALUE) && 1836 (low_tpt < current_tpt) && 1837 (high_tpt < current_tpt)) { 1838 IWL_DEBUG_RATE(mvm, 1839 "Both high and low are worse. Maintain rate\n"); 1840 return RS_ACTION_STAY; 1841 } 1842 1843 if ((low_tpt != IWL_INVALID_VALUE) && 1844 (low_tpt > current_tpt)) { 1845 IWL_DEBUG_RATE(mvm, 1846 "Lower rate is better\n"); 1847 action = RS_ACTION_DOWNSCALE; 1848 goto out; 1849 } 1850 1851 if ((low_tpt == IWL_INVALID_VALUE) && 1852 (low != IWL_RATE_INVALID)) { 1853 IWL_DEBUG_RATE(mvm, 1854 "No data about lower rate\n"); 1855 action = RS_ACTION_DOWNSCALE; 1856 goto out; 1857 } 1858 1859 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1860 1861out: 1862 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1863 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1864 IWL_DEBUG_RATE(mvm, 1865 "SR is above NO DECREASE. Avoid downscale\n"); 1866 action = RS_ACTION_STAY; 1867 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1868 IWL_DEBUG_RATE(mvm, 1869 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1870 action = RS_ACTION_STAY; 1871 } else { 1872 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1873 } 1874 } 1875 1876 return action; 1877} 1878 1879static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1880 struct iwl_lq_sta *lq_sta) 1881{ 1882 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1883 * supports STBC of at least 1*SS 1884 */ 1885 if (!lq_sta->stbc_capable) 1886 return false; 1887 1888 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1889 return false; 1890 1891 return true; 1892} 1893 1894static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1895 int *weaker, int *stronger) 1896{ 1897 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1898 if (*weaker > TPC_MAX_REDUCTION) 1899 *weaker = TPC_INVALID; 1900 1901 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1902 if (*stronger < 0) 1903 *stronger = TPC_INVALID; 1904} 1905 1906static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1907 struct rs_rate *rate, enum nl80211_band band) 1908{ 1909 int index = rate->index; 1910 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1911 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1912 !vif->bss_conf.ps); 1913 1914 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1915 cam, sta_ps_disabled); 1916 /* 1917 * allow tpc only if power management is enabled, or bt coex 1918 * activity grade allows it and we are on 2.4Ghz. 1919 */ 1920 if ((cam || sta_ps_disabled) && 1921 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1922 return false; 1923 1924 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1925 if (is_legacy(rate)) 1926 return index == IWL_RATE_54M_INDEX; 1927 if (is_ht(rate)) 1928 return index == IWL_RATE_MCS_7_INDEX; 1929 if (is_vht(rate)) 1930 return index == IWL_RATE_MCS_7_INDEX || 1931 index == IWL_RATE_MCS_8_INDEX || 1932 index == IWL_RATE_MCS_9_INDEX; 1933 1934 WARN_ON_ONCE(1); 1935 return false; 1936} 1937 1938enum tpc_action { 1939 TPC_ACTION_STAY, 1940 TPC_ACTION_DECREASE, 1941 TPC_ACTION_INCREASE, 1942 TPC_ACTION_NO_RESTIRCTION, 1943}; 1944 1945static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1946 s32 sr, int weak, int strong, 1947 int current_tpt, 1948 int weak_tpt, int strong_tpt) 1949{ 1950 /* stay until we have valid tpt */ 1951 if (current_tpt == IWL_INVALID_VALUE) { 1952 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1953 return TPC_ACTION_STAY; 1954 } 1955 1956 /* Too many failures, increase txp */ 1957 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1958 current_tpt == 0) { 1959 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1960 return TPC_ACTION_NO_RESTIRCTION; 1961 } 1962 1963 /* try decreasing first if applicable */ 1964 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1965 weak != TPC_INVALID) { 1966 if (weak_tpt == IWL_INVALID_VALUE && 1967 (strong_tpt == IWL_INVALID_VALUE || 1968 current_tpt >= strong_tpt)) { 1969 IWL_DEBUG_RATE(mvm, 1970 "no weak txp measurement. decrease txp\n"); 1971 return TPC_ACTION_DECREASE; 1972 } 1973 1974 if (weak_tpt > current_tpt) { 1975 IWL_DEBUG_RATE(mvm, 1976 "lower txp has better tpt. decrease txp\n"); 1977 return TPC_ACTION_DECREASE; 1978 } 1979 } 1980 1981 /* next, increase if needed */ 1982 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1983 strong != TPC_INVALID) { 1984 if (weak_tpt == IWL_INVALID_VALUE && 1985 strong_tpt != IWL_INVALID_VALUE && 1986 current_tpt < strong_tpt) { 1987 IWL_DEBUG_RATE(mvm, 1988 "higher txp has better tpt. increase txp\n"); 1989 return TPC_ACTION_INCREASE; 1990 } 1991 1992 if (weak_tpt < current_tpt && 1993 (strong_tpt == IWL_INVALID_VALUE || 1994 strong_tpt > current_tpt)) { 1995 IWL_DEBUG_RATE(mvm, 1996 "lower txp has worse tpt. increase txp\n"); 1997 return TPC_ACTION_INCREASE; 1998 } 1999 } 2000 2001 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2002 return TPC_ACTION_STAY; 2003} 2004 2005static bool rs_tpc_perform(struct iwl_mvm *mvm, 2006 struct ieee80211_sta *sta, 2007 struct iwl_lq_sta *lq_sta, 2008 struct iwl_scale_tbl_info *tbl) 2009{ 2010 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2011 struct ieee80211_vif *vif = mvm_sta->vif; 2012 struct ieee80211_chanctx_conf *chanctx_conf; 2013 enum nl80211_band band; 2014 struct iwl_rate_scale_data *window; 2015 struct rs_rate *rate = &tbl->rate; 2016 enum tpc_action action; 2017 s32 sr; 2018 u8 cur = lq_sta->lq.reduced_tpc; 2019 int current_tpt; 2020 int weak, strong; 2021 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2022 2023#ifdef CONFIG_MAC80211_DEBUGFS 2024 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2025 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2026 lq_sta->pers.dbg_fixed_txp_reduction); 2027 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2028 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2029 } 2030#endif 2031 2032 rcu_read_lock(); 2033 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2034 if (WARN_ON(!chanctx_conf)) 2035 band = NUM_NL80211_BANDS; 2036 else 2037 band = chanctx_conf->def.chan->band; 2038 rcu_read_unlock(); 2039 2040 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2041 IWL_DEBUG_RATE(mvm, 2042 "tpc is not allowed. remove txp restrictions\n"); 2043 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2044 return cur != TPC_NO_REDUCTION; 2045 } 2046 2047 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2048 2049 /* Collect measured throughputs for current and adjacent rates */ 2050 window = tbl->tpc_win; 2051 sr = window[cur].success_ratio; 2052 current_tpt = window[cur].average_tpt; 2053 if (weak != TPC_INVALID) 2054 weak_tpt = window[weak].average_tpt; 2055 if (strong != TPC_INVALID) 2056 strong_tpt = window[strong].average_tpt; 2057 2058 IWL_DEBUG_RATE(mvm, 2059 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2060 cur, current_tpt, sr, weak, strong, 2061 weak_tpt, strong_tpt); 2062 2063 action = rs_get_tpc_action(mvm, sr, weak, strong, 2064 current_tpt, weak_tpt, strong_tpt); 2065 2066 /* override actions if we are on the edge */ 2067 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2068 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2069 action = TPC_ACTION_STAY; 2070 } else if (strong == TPC_INVALID && 2071 (action == TPC_ACTION_INCREASE || 2072 action == TPC_ACTION_NO_RESTIRCTION)) { 2073 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2074 action = TPC_ACTION_STAY; 2075 } 2076 2077 switch (action) { 2078 case TPC_ACTION_DECREASE: 2079 lq_sta->lq.reduced_tpc = weak; 2080 return true; 2081 case TPC_ACTION_INCREASE: 2082 lq_sta->lq.reduced_tpc = strong; 2083 return true; 2084 case TPC_ACTION_NO_RESTIRCTION: 2085 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2086 return true; 2087 case TPC_ACTION_STAY: 2088 /* do nothing */ 2089 break; 2090 } 2091 return false; 2092} 2093 2094/* 2095 * Do rate scaling and search for new modulation mode. 2096 */ 2097static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2098 struct ieee80211_sta *sta, 2099 struct iwl_lq_sta *lq_sta, 2100 int tid, bool ndp) 2101{ 2102 int low = IWL_RATE_INVALID; 2103 int high = IWL_RATE_INVALID; 2104 int index; 2105 struct iwl_rate_scale_data *window = NULL; 2106 int current_tpt = IWL_INVALID_VALUE; 2107 int low_tpt = IWL_INVALID_VALUE; 2108 int high_tpt = IWL_INVALID_VALUE; 2109 u32 fail_count; 2110 enum rs_action scale_action = RS_ACTION_STAY; 2111 u16 rate_mask; 2112 u8 update_lq = 0; 2113 struct iwl_scale_tbl_info *tbl, *tbl1; 2114 u8 active_tbl = 0; 2115 u8 done_search = 0; 2116 u16 high_low; 2117 s32 sr; 2118 u8 prev_agg = lq_sta->is_agg; 2119 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2120 struct rs_rate *rate; 2121 2122 lq_sta->is_agg = !!mvmsta->agg_tids; 2123 2124 /* 2125 * Select rate-scale / modulation-mode table to work with in 2126 * the rest of this function: "search" if searching for better 2127 * modulation mode, or "active" if doing rate scaling within a mode. 2128 */ 2129 if (!lq_sta->search_better_tbl) 2130 active_tbl = lq_sta->active_tbl; 2131 else 2132 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2133 2134 tbl = &(lq_sta->lq_info[active_tbl]); 2135 rate = &tbl->rate; 2136 2137 if (prev_agg != lq_sta->is_agg) { 2138 IWL_DEBUG_RATE(mvm, 2139 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2140 prev_agg, lq_sta->is_agg); 2141 rs_set_expected_tpt_table(lq_sta, tbl); 2142 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2143 } 2144 2145 /* current tx rate */ 2146 index = rate->index; 2147 2148 /* rates available for this association, and for modulation mode */ 2149 rate_mask = rs_get_supported_rates(lq_sta, rate); 2150 2151 if (!(BIT(index) & rate_mask)) { 2152 IWL_ERR(mvm, "Current Rate is not valid\n"); 2153 if (lq_sta->search_better_tbl) { 2154 /* revert to active table if search table is not valid*/ 2155 rate->type = LQ_NONE; 2156 lq_sta->search_better_tbl = 0; 2157 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2158 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2159 } 2160 return; 2161 } 2162 2163 /* Get expected throughput table and history window for current rate */ 2164 if (!tbl->expected_tpt) { 2165 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2166 return; 2167 } 2168 2169 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2170 window = &(tbl->win[index]); 2171 2172 /* 2173 * If there is not enough history to calculate actual average 2174 * throughput, keep analyzing results of more tx frames, without 2175 * changing rate or mode (bypass most of the rest of this function). 2176 * Set up new rate table in uCode only if old rate is not supported 2177 * in current association (use new rate found above). 2178 */ 2179 fail_count = window->counter - window->success_counter; 2180 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2181 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2182 IWL_DEBUG_RATE(mvm, 2183 "%s: Test Window: succ %d total %d\n", 2184 rs_pretty_rate(rate), 2185 window->success_counter, window->counter); 2186 2187 /* Can't calculate this yet; not enough history */ 2188 window->average_tpt = IWL_INVALID_VALUE; 2189 2190 /* Should we stay with this modulation mode, 2191 * or search for a new one? */ 2192 rs_stay_in_table(lq_sta, false); 2193 2194 return; 2195 } 2196 2197 /* If we are searching for better modulation mode, check success. */ 2198 if (lq_sta->search_better_tbl) { 2199 /* If good success, continue using the "search" mode; 2200 * no need to send new link quality command, since we're 2201 * continuing to use the setup that we've been trying. */ 2202 if (window->average_tpt > lq_sta->last_tpt) { 2203 IWL_DEBUG_RATE(mvm, 2204 "SWITCHING TO NEW TABLE SR: %d " 2205 "cur-tpt %d old-tpt %d\n", 2206 window->success_ratio, 2207 window->average_tpt, 2208 lq_sta->last_tpt); 2209 2210 /* Swap tables; "search" becomes "active" */ 2211 lq_sta->active_tbl = active_tbl; 2212 current_tpt = window->average_tpt; 2213 /* Else poor success; go back to mode in "active" table */ 2214 } else { 2215 IWL_DEBUG_RATE(mvm, 2216 "GOING BACK TO THE OLD TABLE: SR %d " 2217 "cur-tpt %d old-tpt %d\n", 2218 window->success_ratio, 2219 window->average_tpt, 2220 lq_sta->last_tpt); 2221 2222 /* Nullify "search" table */ 2223 rate->type = LQ_NONE; 2224 2225 /* Revert to "active" table */ 2226 active_tbl = lq_sta->active_tbl; 2227 tbl = &(lq_sta->lq_info[active_tbl]); 2228 2229 /* Revert to "active" rate and throughput info */ 2230 index = tbl->rate.index; 2231 current_tpt = lq_sta->last_tpt; 2232 2233 /* Need to set up a new rate table in uCode */ 2234 update_lq = 1; 2235 } 2236 2237 /* Either way, we've made a decision; modulation mode 2238 * search is done, allow rate adjustment next time. */ 2239 lq_sta->search_better_tbl = 0; 2240 done_search = 1; /* Don't switch modes below! */ 2241 goto lq_update; 2242 } 2243 2244 /* (Else) not in search of better modulation mode, try for better 2245 * starting rate, while staying in this mode. */ 2246 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2247 low = high_low & 0xff; 2248 high = (high_low >> 8) & 0xff; 2249 2250 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2251 2252 sr = window->success_ratio; 2253 2254 /* Collect measured throughputs for current and adjacent rates */ 2255 current_tpt = window->average_tpt; 2256 if (low != IWL_RATE_INVALID) 2257 low_tpt = tbl->win[low].average_tpt; 2258 if (high != IWL_RATE_INVALID) 2259 high_tpt = tbl->win[high].average_tpt; 2260 2261 IWL_DEBUG_RATE(mvm, 2262 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2263 rs_pretty_rate(rate), current_tpt, sr, 2264 low, high, low_tpt, high_tpt); 2265 2266 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2267 current_tpt, low_tpt, high_tpt); 2268 2269 /* Force a search in case BT doesn't like us being in MIMO */ 2270 if (is_mimo(rate) && 2271 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2272 IWL_DEBUG_RATE(mvm, 2273 "BT Coex forbids MIMO. Search for new config\n"); 2274 rs_stay_in_table(lq_sta, true); 2275 goto lq_update; 2276 } 2277 2278 switch (scale_action) { 2279 case RS_ACTION_DOWNSCALE: 2280 /* Decrease starting rate, update uCode's rate table */ 2281 if (low != IWL_RATE_INVALID) { 2282 update_lq = 1; 2283 index = low; 2284 } else { 2285 IWL_DEBUG_RATE(mvm, 2286 "At the bottom rate. Can't decrease\n"); 2287 } 2288 2289 break; 2290 case RS_ACTION_UPSCALE: 2291 /* Increase starting rate, update uCode's rate table */ 2292 if (high != IWL_RATE_INVALID) { 2293 update_lq = 1; 2294 index = high; 2295 } else { 2296 IWL_DEBUG_RATE(mvm, 2297 "At the top rate. Can't increase\n"); 2298 } 2299 2300 break; 2301 case RS_ACTION_STAY: 2302 /* No change */ 2303 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2304 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2305 break; 2306 default: 2307 break; 2308 } 2309 2310lq_update: 2311 /* Replace uCode's rate table for the destination station. */ 2312 if (update_lq) { 2313 tbl->rate.index = index; 2314 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2315 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2316 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2317 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2318 } 2319 2320 rs_stay_in_table(lq_sta, false); 2321 2322 /* 2323 * Search for new modulation mode if we're: 2324 * 1) Not changing rates right now 2325 * 2) Not just finishing up a search 2326 * 3) Allowing a new search 2327 */ 2328 if (!update_lq && !done_search && 2329 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2330 && window->counter) { 2331 enum rs_column next_column; 2332 2333 /* Save current throughput to compare with "search" throughput*/ 2334 lq_sta->last_tpt = current_tpt; 2335 2336 IWL_DEBUG_RATE(mvm, 2337 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2338 update_lq, done_search, lq_sta->rs_state, 2339 window->counter); 2340 2341 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2342 if (next_column != RS_COLUMN_INVALID) { 2343 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2344 next_column); 2345 if (!ret) 2346 lq_sta->search_better_tbl = 1; 2347 } else { 2348 IWL_DEBUG_RATE(mvm, 2349 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2350 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2351 } 2352 2353 /* If new "search" mode was selected, set up in uCode table */ 2354 if (lq_sta->search_better_tbl) { 2355 /* Access the "search" table, clear its history. */ 2356 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 2357 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2358 2359 /* Use new "search" start rate */ 2360 index = tbl->rate.index; 2361 2362 rs_dump_rate(mvm, &tbl->rate, 2363 "Switch to SEARCH TABLE:"); 2364 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2365 } else { 2366 done_search = 1; 2367 } 2368 } 2369 2370 if (!ndp) 2371 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2372 2373 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2374 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2375 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2376 } 2377} 2378 2379struct rs_init_rate_info { 2380 s8 rssi; 2381 u8 rate_idx; 2382}; 2383 2384static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2385 { -60, IWL_RATE_54M_INDEX }, 2386 { -64, IWL_RATE_48M_INDEX }, 2387 { -68, IWL_RATE_36M_INDEX }, 2388 { -80, IWL_RATE_24M_INDEX }, 2389 { -84, IWL_RATE_18M_INDEX }, 2390 { -85, IWL_RATE_12M_INDEX }, 2391 { -86, IWL_RATE_11M_INDEX }, 2392 { -88, IWL_RATE_5M_INDEX }, 2393 { -90, IWL_RATE_2M_INDEX }, 2394 { S8_MIN, IWL_RATE_1M_INDEX }, 2395}; 2396 2397static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2398 { -60, IWL_RATE_54M_INDEX }, 2399 { -64, IWL_RATE_48M_INDEX }, 2400 { -72, IWL_RATE_36M_INDEX }, 2401 { -80, IWL_RATE_24M_INDEX }, 2402 { -84, IWL_RATE_18M_INDEX }, 2403 { -85, IWL_RATE_12M_INDEX }, 2404 { -87, IWL_RATE_9M_INDEX }, 2405 { S8_MIN, IWL_RATE_6M_INDEX }, 2406}; 2407 2408static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2409 { -60, IWL_RATE_MCS_7_INDEX }, 2410 { -64, IWL_RATE_MCS_6_INDEX }, 2411 { -68, IWL_RATE_MCS_5_INDEX }, 2412 { -72, IWL_RATE_MCS_4_INDEX }, 2413 { -80, IWL_RATE_MCS_3_INDEX }, 2414 { -84, IWL_RATE_MCS_2_INDEX }, 2415 { -85, IWL_RATE_MCS_1_INDEX }, 2416 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2417}; 2418 2419/* MCS index 9 is not valid for 20MHz VHT channel width, 2420 * but is ok for 40, 80 and 160MHz channels. 2421 */ 2422static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2423 { -60, IWL_RATE_MCS_8_INDEX }, 2424 { -64, IWL_RATE_MCS_7_INDEX }, 2425 { -68, IWL_RATE_MCS_6_INDEX }, 2426 { -72, IWL_RATE_MCS_5_INDEX }, 2427 { -80, IWL_RATE_MCS_4_INDEX }, 2428 { -84, IWL_RATE_MCS_3_INDEX }, 2429 { -85, IWL_RATE_MCS_2_INDEX }, 2430 { -87, IWL_RATE_MCS_1_INDEX }, 2431 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2432}; 2433 2434static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2435 { -60, IWL_RATE_MCS_9_INDEX }, 2436 { -64, IWL_RATE_MCS_8_INDEX }, 2437 { -68, IWL_RATE_MCS_7_INDEX }, 2438 { -72, IWL_RATE_MCS_6_INDEX }, 2439 { -80, IWL_RATE_MCS_5_INDEX }, 2440 { -84, IWL_RATE_MCS_4_INDEX }, 2441 { -85, IWL_RATE_MCS_3_INDEX }, 2442 { -87, IWL_RATE_MCS_2_INDEX }, 2443 { -88, IWL_RATE_MCS_1_INDEX }, 2444 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2445}; 2446 2447#define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2448 2449/* Init the optimal rate based on STA caps 2450 * This combined with rssi is used to report the last tx rate 2451 * to userspace when we haven't transmitted enough frames. 2452 */ 2453static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2454 struct ieee80211_sta *sta, 2455 struct iwl_lq_sta *lq_sta) 2456{ 2457 struct rs_rate *rate = &lq_sta->optimal_rate; 2458 2459 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2460 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2461 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2462 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2463 else if (lq_sta->band == NL80211_BAND_5GHZ) 2464 rate->type = LQ_LEGACY_A; 2465 else 2466 rate->type = LQ_LEGACY_G; 2467 2468 rate->bw = rs_bw_from_sta_bw(sta); 2469 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2470 2471 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2472 2473 if (is_mimo(rate)) { 2474 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2475 } else if (is_siso(rate)) { 2476 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2477 } else { 2478 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2479 2480 if (lq_sta->band == NL80211_BAND_5GHZ) { 2481 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2482 lq_sta->optimal_nentries = 2483 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2484 } else { 2485 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2486 lq_sta->optimal_nentries = 2487 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2488 } 2489 } 2490 2491 if (is_vht(rate)) { 2492 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2493 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2494 lq_sta->optimal_nentries = 2495 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2496 } else { 2497 lq_sta->optimal_rates = rs_optimal_rates_vht; 2498 lq_sta->optimal_nentries = 2499 ARRAY_SIZE(rs_optimal_rates_vht); 2500 } 2501 } else if (is_ht(rate)) { 2502 lq_sta->optimal_rates = rs_optimal_rates_ht; 2503 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2504 } 2505} 2506 2507/* Compute the optimal rate index based on RSSI */ 2508static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2509 struct iwl_lq_sta *lq_sta) 2510{ 2511 struct rs_rate *rate = &lq_sta->optimal_rate; 2512 int i; 2513 2514 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2515 BITS_PER_LONG); 2516 2517 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2518 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2519 2520 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2521 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2522 rate->index = rate_idx; 2523 break; 2524 } 2525 } 2526 2527 return rate; 2528} 2529 2530/* Choose an initial legacy rate and antenna to use based on the RSSI 2531 * of last Rx 2532 */ 2533static void rs_get_initial_rate(struct iwl_mvm *mvm, 2534 struct ieee80211_sta *sta, 2535 struct iwl_lq_sta *lq_sta, 2536 enum nl80211_band band, 2537 struct rs_rate *rate) 2538{ 2539 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2540 int i, nentries; 2541 unsigned long active_rate; 2542 s8 best_rssi = S8_MIN; 2543 u8 best_ant = ANT_NONE; 2544 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2545 const struct rs_init_rate_info *initial_rates; 2546 2547 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2548 if (!(lq_sta->pers.chains & BIT(i))) 2549 continue; 2550 2551 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2552 best_rssi = lq_sta->pers.chain_signal[i]; 2553 best_ant = BIT(i); 2554 } 2555 } 2556 2557 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2558 rs_pretty_ant(best_ant), best_rssi); 2559 2560 if (best_ant != ANT_A && best_ant != ANT_B) 2561 rate->ant = first_antenna(valid_tx_ant); 2562 else 2563 rate->ant = best_ant; 2564 2565 rate->sgi = false; 2566 rate->ldpc = false; 2567 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2568 2569 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2570 BITS_PER_LONG); 2571 2572 if (band == NL80211_BAND_5GHZ) { 2573 rate->type = LQ_LEGACY_A; 2574 initial_rates = rs_optimal_rates_5ghz_legacy; 2575 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2576 } else { 2577 rate->type = LQ_LEGACY_G; 2578 initial_rates = rs_optimal_rates_24ghz_legacy; 2579 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2580 } 2581 2582 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2583 goto out; 2584 2585 /* Start from a higher rate if the corresponding debug capability 2586 * is enabled. The rate is chosen according to AP capabilities. 2587 * In case of VHT/HT when the rssi is low fallback to the case of 2588 * legacy rates. 2589 */ 2590 if (sta->vht_cap.vht_supported && 2591 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2592 /* 2593 * In AP mode, when a new station associates, rs is initialized 2594 * immediately upon association completion, before the phy 2595 * context is updated with the association parameters, so the 2596 * sta bandwidth might be wider than the phy context allows. 2597 * To avoid this issue, always initialize rs with 20mhz 2598 * bandwidth rate, and after authorization, when the phy context 2599 * is already up-to-date, re-init rs with the correct bw. 2600 */ 2601 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2602 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2603 2604 switch (bw) { 2605 case RATE_MCS_CHAN_WIDTH_40: 2606 case RATE_MCS_CHAN_WIDTH_80: 2607 case RATE_MCS_CHAN_WIDTH_160: 2608 initial_rates = rs_optimal_rates_vht; 2609 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2610 break; 2611 case RATE_MCS_CHAN_WIDTH_20: 2612 initial_rates = rs_optimal_rates_vht_20mhz; 2613 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2614 break; 2615 default: 2616 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2617 goto out; 2618 } 2619 2620 active_rate = lq_sta->active_siso_rate; 2621 rate->type = LQ_VHT_SISO; 2622 rate->bw = bw; 2623 } else if (sta->ht_cap.ht_supported && 2624 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2625 initial_rates = rs_optimal_rates_ht; 2626 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2627 active_rate = lq_sta->active_siso_rate; 2628 rate->type = LQ_HT_SISO; 2629 } else { 2630 active_rate = lq_sta->active_legacy_rate; 2631 } 2632 2633 for (i = 0; i < nentries; i++) { 2634 int rate_idx = initial_rates[i].rate_idx; 2635 2636 if ((best_rssi >= initial_rates[i].rssi) && 2637 (BIT(rate_idx) & active_rate)) { 2638 rate->index = rate_idx; 2639 break; 2640 } 2641 } 2642 2643out: 2644 rs_dump_rate(mvm, rate, "INITIAL"); 2645} 2646 2647/* Save info about RSSI of last Rx */ 2648void rs_update_last_rssi(struct iwl_mvm *mvm, 2649 struct iwl_mvm_sta *mvmsta, 2650 struct ieee80211_rx_status *rx_status) 2651{ 2652 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2653 int i; 2654 2655 lq_sta->pers.chains = rx_status->chains; 2656 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2657 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2658 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2659 lq_sta->pers.last_rssi = S8_MIN; 2660 2661 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2662 if (!(lq_sta->pers.chains & BIT(i))) 2663 continue; 2664 2665 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2666 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2667 } 2668} 2669 2670/** 2671 * rs_initialize_lq - Initialize a station's hardware rate table 2672 * 2673 * The uCode's station table contains a table of fallback rates 2674 * for automatic fallback during transmission. 2675 * 2676 * NOTE: This sets up a default set of values. These will be replaced later 2677 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2678 * rc80211_simple. 2679 * 2680 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2681 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2682 * which requires station table entry to exist). 2683 */ 2684static void rs_initialize_lq(struct iwl_mvm *mvm, 2685 struct ieee80211_sta *sta, 2686 struct iwl_lq_sta *lq_sta, 2687 enum nl80211_band band) 2688{ 2689 struct iwl_scale_tbl_info *tbl; 2690 struct rs_rate *rate; 2691 u8 active_tbl = 0; 2692 2693 if (!sta || !lq_sta) 2694 return; 2695 2696 if (!lq_sta->search_better_tbl) 2697 active_tbl = lq_sta->active_tbl; 2698 else 2699 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2700 2701 tbl = &(lq_sta->lq_info[active_tbl]); 2702 rate = &tbl->rate; 2703 2704 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2705 rs_init_optimal_rate(mvm, sta, lq_sta); 2706 2707 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2708 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2709 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2710 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2711 2712 tbl->column = rs_get_column_from_rate(rate); 2713 2714 rs_set_expected_tpt_table(lq_sta, tbl); 2715 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2716 /* TODO restore station should remember the lq cmd */ 2717 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 2718} 2719 2720static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2721 void *mvm_sta, 2722 struct ieee80211_tx_rate_control *txrc) 2723{ 2724 struct iwl_op_mode *op_mode = mvm_r; 2725 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2726 struct sk_buff *skb = txrc->skb; 2727 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2728 struct iwl_lq_sta *lq_sta; 2729 struct rs_rate *optimal_rate; 2730 u32 last_ucode_rate; 2731 2732 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2733 /* if vif isn't initialized mvm doesn't know about 2734 * this station, so don't do anything with the it 2735 */ 2736 sta = NULL; 2737 mvm_sta = NULL; 2738 } 2739 2740 if (!mvm_sta) 2741 return; 2742 2743 lq_sta = mvm_sta; 2744 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2745 info->band, &info->control.rates[0]); 2746 info->control.rates[0].count = 1; 2747 2748 /* Report the optimal rate based on rssi and STA caps if we haven't 2749 * converged yet (too little traffic) or exploring other modulations 2750 */ 2751 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2752 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2753 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2754 optimal_rate); 2755 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2756 &txrc->reported_rate); 2757 } 2758} 2759 2760static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2761 gfp_t gfp) 2762{ 2763 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2764 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2765 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2766 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2767 2768 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2769 2770 lq_sta->pers.drv = mvm; 2771#ifdef CONFIG_MAC80211_DEBUGFS 2772 lq_sta->pers.dbg_fixed_rate = 0; 2773 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2774 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2775#endif 2776 lq_sta->pers.chains = 0; 2777 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2778 lq_sta->pers.last_rssi = S8_MIN; 2779 2780 return lq_sta; 2781} 2782 2783static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2784 int nss) 2785{ 2786 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2787 (0x3 << (2 * (nss - 1))); 2788 rx_mcs >>= (2 * (nss - 1)); 2789 2790 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2791 return IWL_RATE_MCS_7_INDEX; 2792 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2793 return IWL_RATE_MCS_8_INDEX; 2794 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2795 return IWL_RATE_MCS_9_INDEX; 2796 2797 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2798 return -1; 2799} 2800 2801static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2802 struct ieee80211_sta_vht_cap *vht_cap, 2803 struct iwl_lq_sta *lq_sta) 2804{ 2805 int i; 2806 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2807 2808 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2809 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2810 if (i == IWL_RATE_9M_INDEX) 2811 continue; 2812 2813 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2814 if (i == IWL_RATE_MCS_9_INDEX && 2815 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2816 continue; 2817 2818 lq_sta->active_siso_rate |= BIT(i); 2819 } 2820 } 2821 2822 if (sta->rx_nss < 2) 2823 return; 2824 2825 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2826 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2827 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2828 if (i == IWL_RATE_9M_INDEX) 2829 continue; 2830 2831 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2832 if (i == IWL_RATE_MCS_9_INDEX && 2833 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2834 continue; 2835 2836 lq_sta->active_mimo2_rate |= BIT(i); 2837 } 2838 } 2839} 2840 2841static void rs_ht_init(struct iwl_mvm *mvm, 2842 struct ieee80211_sta *sta, 2843 struct iwl_lq_sta *lq_sta, 2844 struct ieee80211_sta_ht_cap *ht_cap) 2845{ 2846 /* active_siso_rate mask includes 9 MBits (bit 5), 2847 * and CCK (bits 0-3), supp_rates[] does not; 2848 * shift to convert format, force 9 MBits off. 2849 */ 2850 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2851 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2852 lq_sta->active_siso_rate &= ~((u16)0x2); 2853 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2854 2855 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2856 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2857 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2858 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2859 2860 if (mvm->cfg->ht_params->ldpc && 2861 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2862 lq_sta->ldpc = true; 2863 2864 if (mvm->cfg->ht_params->stbc && 2865 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2866 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2867 lq_sta->stbc_capable = true; 2868 2869 lq_sta->is_vht = false; 2870} 2871 2872static void rs_vht_init(struct iwl_mvm *mvm, 2873 struct ieee80211_sta *sta, 2874 struct iwl_lq_sta *lq_sta, 2875 struct ieee80211_sta_vht_cap *vht_cap) 2876{ 2877 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2878 2879 if (mvm->cfg->ht_params->ldpc && 2880 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2881 lq_sta->ldpc = true; 2882 2883 if (mvm->cfg->ht_params->stbc && 2884 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2885 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2886 lq_sta->stbc_capable = true; 2887 2888 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2889 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2890 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2891 lq_sta->bfer_capable = true; 2892 2893 lq_sta->is_vht = true; 2894} 2895 2896#ifdef CONFIG_IWLWIFI_DEBUGFS 2897void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2898{ 2899 spin_lock_bh(&mvm->drv_stats_lock); 2900 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2901 spin_unlock_bh(&mvm->drv_stats_lock); 2902} 2903 2904void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2905{ 2906 u8 nss = 0; 2907 2908 spin_lock(&mvm->drv_stats_lock); 2909 2910 if (agg) 2911 mvm->drv_rx_stats.agg_frames++; 2912 2913 mvm->drv_rx_stats.success_frames++; 2914 2915 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 2916 case RATE_MCS_CHAN_WIDTH_20: 2917 mvm->drv_rx_stats.bw_20_frames++; 2918 break; 2919 case RATE_MCS_CHAN_WIDTH_40: 2920 mvm->drv_rx_stats.bw_40_frames++; 2921 break; 2922 case RATE_MCS_CHAN_WIDTH_80: 2923 mvm->drv_rx_stats.bw_80_frames++; 2924 break; 2925 case RATE_MCS_CHAN_WIDTH_160: 2926 mvm->drv_rx_stats.bw_160_frames++; 2927 break; 2928 default: 2929 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2930 } 2931 2932 if (rate & RATE_MCS_HT_MSK) { 2933 mvm->drv_rx_stats.ht_frames++; 2934 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 2935 } else if (rate & RATE_MCS_VHT_MSK) { 2936 mvm->drv_rx_stats.vht_frames++; 2937 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2938 RATE_VHT_MCS_NSS_POS) + 1; 2939 } else { 2940 mvm->drv_rx_stats.legacy_frames++; 2941 } 2942 2943 if (nss == 1) 2944 mvm->drv_rx_stats.siso_frames++; 2945 else if (nss == 2) 2946 mvm->drv_rx_stats.mimo2_frames++; 2947 2948 if (rate & RATE_MCS_SGI_MSK) 2949 mvm->drv_rx_stats.sgi_frames++; 2950 else 2951 mvm->drv_rx_stats.ngi_frames++; 2952 2953 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2954 mvm->drv_rx_stats.last_frame_idx = 2955 (mvm->drv_rx_stats.last_frame_idx + 1) % 2956 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2957 2958 spin_unlock(&mvm->drv_stats_lock); 2959} 2960#endif 2961 2962/* 2963 * Called after adding a new station to initialize rate scaling 2964 */ 2965static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2966 enum nl80211_band band) 2967{ 2968 int i, j; 2969 struct ieee80211_hw *hw = mvm->hw; 2970 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2971 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2972 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2973 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2974 struct ieee80211_supported_band *sband; 2975 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2976 2977 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock); 2978 2979 /* clear all non-persistent lq data */ 2980 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2981 2982 sband = hw->wiphy->bands[band]; 2983 2984 lq_sta->lq.sta_id = mvmsta->sta_id; 2985 mvmsta->amsdu_enabled = 0; 2986 mvmsta->max_amsdu_len = sta->max_amsdu_len; 2987 2988 for (j = 0; j < LQ_SIZE; j++) 2989 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2990 2991 lq_sta->flush_timer = 0; 2992 lq_sta->last_tx = jiffies; 2993 2994 IWL_DEBUG_RATE(mvm, 2995 "LQ: *** rate scale station global init for station %d ***\n", 2996 mvmsta->sta_id); 2997 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2998 * the lowest or the highest rate.. Could consider using RSSI from 2999 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3000 * after assoc.. */ 3001 3002 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3003 lq_sta->band = sband->band; 3004 /* 3005 * active legacy rates as per supported rates bitmap 3006 */ 3007 supp = sta->supp_rates[sband->band]; 3008 lq_sta->active_legacy_rate = 0; 3009 for_each_set_bit(i, &supp, BITS_PER_LONG) 3010 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3011 3012 /* TODO: should probably account for rx_highest for both HT/VHT */ 3013 if (!vht_cap || !vht_cap->vht_supported) 3014 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3015 else 3016 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3017 3018 lq_sta->max_legacy_rate_idx = 3019 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3020 lq_sta->max_siso_rate_idx = 3021 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3022 lq_sta->max_mimo2_rate_idx = 3023 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3024 3025 IWL_DEBUG_RATE(mvm, 3026 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3027 lq_sta->active_legacy_rate, 3028 lq_sta->active_siso_rate, 3029 lq_sta->active_mimo2_rate, 3030 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3031 lq_sta->bfer_capable); 3032 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3033 lq_sta->max_legacy_rate_idx, 3034 lq_sta->max_siso_rate_idx, 3035 lq_sta->max_mimo2_rate_idx); 3036 3037 /* These values will be overridden later */ 3038 lq_sta->lq.single_stream_ant_msk = 3039 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3040 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3041 3042 /* as default allow aggregation for all tids */ 3043 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3044 lq_sta->is_agg = 0; 3045#ifdef CONFIG_IWLWIFI_DEBUGFS 3046 iwl_mvm_reset_frame_stats(mvm); 3047#endif 3048 rs_initialize_lq(mvm, sta, lq_sta, band); 3049} 3050 3051static void rs_drv_rate_update(void *mvm_r, 3052 struct ieee80211_supported_band *sband, 3053 struct cfg80211_chan_def *chandef, 3054 struct ieee80211_sta *sta, 3055 void *priv_sta, u32 changed) 3056{ 3057 struct iwl_op_mode *op_mode = mvm_r; 3058 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3059 u8 tid; 3060 3061 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3062 return; 3063 3064 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3065 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3066 ieee80211_stop_tx_ba_session(sta, tid); 3067 3068 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3069} 3070 3071static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, 3072 struct ieee80211_sta *sta, 3073 int tid, struct ieee80211_tx_info *info, 3074 bool ndp) 3075{ 3076 int legacy_success; 3077 int retries; 3078 int i; 3079 struct iwl_lq_cmd *table; 3080 u32 lq_hwrate; 3081 struct rs_rate lq_rate, tx_resp_rate; 3082 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 3083 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 3084 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 3085 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 3086 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 3087 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3088 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3089 3090 if (!lq_sta->pers.drv) { 3091 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 3092 return; 3093 } 3094 3095 /* This packet was aggregated but doesn't carry status info */ 3096 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 3097 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 3098 return; 3099 3100 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 3101 &tx_resp_rate)) { 3102 WARN_ON_ONCE(1); 3103 return; 3104 } 3105 3106#ifdef CONFIG_MAC80211_DEBUGFS 3107 /* Disable last tx check if we are debugging with fixed rate but 3108 * update tx stats 3109 */ 3110 if (lq_sta->pers.dbg_fixed_rate) { 3111 int index = tx_resp_rate.index; 3112 enum rs_column column; 3113 int attempts, success; 3114 3115 column = rs_get_column_from_rate(&tx_resp_rate); 3116 if (WARN_ONCE(column == RS_COLUMN_INVALID, 3117 "Can't map rate 0x%x to column", 3118 tx_resp_hwrate)) 3119 return; 3120 3121 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3122 attempts = info->status.ampdu_len; 3123 success = info->status.ampdu_ack_len; 3124 } else { 3125 attempts = info->status.rates[0].count; 3126 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3127 } 3128 3129 lq_sta->pers.tx_stats[column][index].total += attempts; 3130 lq_sta->pers.tx_stats[column][index].success += success; 3131 3132 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 3133 tx_resp_hwrate, success, attempts); 3134 return; 3135 } 3136#endif 3137 3138 if (time_after(jiffies, 3139 (unsigned long)(lq_sta->last_tx + 3140 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 3141 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 3142 /* reach here only in case of driver RS, call directly 3143 * the unlocked version 3144 */ 3145 rs_drv_rate_init(mvm, sta, info->band); 3146 return; 3147 } 3148 lq_sta->last_tx = jiffies; 3149 3150 /* Ignore this Tx frame response if its initial rate doesn't match 3151 * that of latest Link Quality command. There may be stragglers 3152 * from a previous Link Quality command, but we're no longer interested 3153 * in those; they're either from the "active" mode while we're trying 3154 * to check "search" mode, or a prior "search" mode after we've moved 3155 * to a new "search" mode (which might become the new "active" mode). 3156 */ 3157 table = &lq_sta->lq; 3158 lq_hwrate = le32_to_cpu(table->rs_table[0]); 3159 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 3160 WARN_ON_ONCE(1); 3161 return; 3162 } 3163 3164 /* Here we actually compare this rate to the latest LQ command */ 3165 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 3166 IWL_DEBUG_RATE(mvm, 3167 "tx resp color 0x%x does not match 0x%x\n", 3168 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 3169 3170 /* Since rates mis-match, the last LQ command may have failed. 3171 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 3172 * ... driver. 3173 */ 3174 lq_sta->missed_rate_counter++; 3175 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 3176 lq_sta->missed_rate_counter = 0; 3177 IWL_DEBUG_RATE(mvm, 3178 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 3179 lq_sta->rs_state); 3180 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 3181 } 3182 /* Regardless, ignore this status info for outdated rate */ 3183 return; 3184 } 3185 3186 /* Rate did match, so reset the missed_rate_counter */ 3187 lq_sta->missed_rate_counter = 0; 3188 3189 if (!lq_sta->search_better_tbl) { 3190 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3191 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3192 } else { 3193 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3194 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3195 } 3196 3197 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 3198 IWL_DEBUG_RATE(mvm, 3199 "Neither active nor search matches tx rate\n"); 3200 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3201 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 3202 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3203 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 3204 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 3205 3206 /* no matching table found, let's by-pass the data collection 3207 * and continue to perform rate scale to find the rate table 3208 */ 3209 rs_stay_in_table(lq_sta, true); 3210 goto done; 3211 } 3212 3213 /* Updating the frame history depends on whether packets were 3214 * aggregated. 3215 * 3216 * For aggregation, all packets were transmitted at the same rate, the 3217 * first index into rate scale table. 3218 */ 3219 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3220 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 3221 info->status.ampdu_len, 3222 info->status.ampdu_ack_len, 3223 reduced_txp); 3224 3225 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 3226 * it as a single frame loss as we don't want the success ratio 3227 * to dip too quickly because a BA wasn't received. 3228 * For TPC, there's no need for this optimisation since we want 3229 * to recover very quickly from a bad power reduction and, 3230 * therefore we'd like the success ratio to get an immediate hit 3231 * when failing to get a BA, so we'd switch back to a lower or 3232 * zero power reduction. When FW transmits agg with a rate 3233 * different from the initial rate, it will not use reduced txp 3234 * and will send BA notification twice (one empty with reduced 3235 * txp equal to the value from LQ and one with reduced txp 0). 3236 * We need to update counters for each txp level accordingly. 3237 */ 3238 if (info->status.ampdu_ack_len == 0) 3239 info->status.ampdu_len = 1; 3240 3241 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, 3242 tx_resp_rate.index, 3243 info->status.ampdu_len, 3244 info->status.ampdu_ack_len); 3245 3246 /* Update success/fail counts if not searching for new mode */ 3247 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3248 lq_sta->total_success += info->status.ampdu_ack_len; 3249 lq_sta->total_failed += (info->status.ampdu_len - 3250 info->status.ampdu_ack_len); 3251 } 3252 } else { 3253 /* For legacy, update frame history with for each Tx retry. */ 3254 retries = info->status.rates[0].count - 1; 3255 /* HW doesn't send more than 15 retries */ 3256 retries = min(retries, 15); 3257 3258 /* The last transmission may have been successful */ 3259 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3260 /* Collect data for each rate used during failed TX attempts */ 3261 for (i = 0; i <= retries; ++i) { 3262 lq_hwrate = le32_to_cpu(table->rs_table[i]); 3263 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 3264 &lq_rate)) { 3265 WARN_ON_ONCE(1); 3266 return; 3267 } 3268 3269 /* Only collect stats if retried rate is in the same RS 3270 * table as active/search. 3271 */ 3272 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 3273 tmp_tbl = curr_tbl; 3274 else if (rs_rate_column_match(&lq_rate, 3275 &other_tbl->rate)) 3276 tmp_tbl = other_tbl; 3277 else 3278 continue; 3279 3280 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 3281 tx_resp_rate.index, 1, 3282 i < retries ? 0 : legacy_success, 3283 reduced_txp); 3284 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 3285 tx_resp_rate.index, 1, 3286 i < retries ? 0 : legacy_success); 3287 } 3288 3289 /* Update success/fail counts if not searching for new mode */ 3290 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3291 lq_sta->total_success += legacy_success; 3292 lq_sta->total_failed += retries + (1 - legacy_success); 3293 } 3294 } 3295 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 3296 lq_sta->last_rate_n_flags = lq_hwrate; 3297 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 3298done: 3299 /* See if there's a better rate or modulation mode to try. */ 3300 if (sta->supp_rates[info->band]) 3301 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 3302} 3303 3304void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3305 int tid, struct ieee80211_tx_info *info, bool ndp) 3306{ 3307 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3308 3309 /* If it's locked we are in middle of init flow 3310 * just wait for next tx status to update the lq_sta data 3311 */ 3312 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock)) 3313 return; 3314 3315 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp); 3316 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 3317} 3318 3319#ifdef CONFIG_MAC80211_DEBUGFS 3320static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3321 struct iwl_lq_cmd *lq_cmd, 3322 enum nl80211_band band, 3323 u32 ucode_rate) 3324{ 3325 struct rs_rate rate; 3326 int i; 3327 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3328 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3329 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3330 3331 for (i = 0; i < num_rates; i++) 3332 lq_cmd->rs_table[i] = ucode_rate_le32; 3333 3334 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3335 WARN_ON_ONCE(1); 3336 return; 3337 } 3338 3339 if (is_mimo(&rate)) 3340 lq_cmd->mimo_delim = num_rates - 1; 3341 else 3342 lq_cmd->mimo_delim = 0; 3343 3344 lq_cmd->reduced_tpc = 0; 3345 3346 if (num_of_ant(ant) == 1) 3347 lq_cmd->single_stream_ant_msk = ant; 3348 3349 if (!mvm->trans->trans_cfg->gen2) 3350 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3351 else 3352 lq_cmd->agg_frame_cnt_limit = 3353 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3354} 3355#endif /* CONFIG_MAC80211_DEBUGFS */ 3356 3357static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3358 struct iwl_lq_sta *lq_sta, 3359 struct rs_rate *rate, 3360 __le32 *rs_table, int *rs_table_index, 3361 int num_rates, int num_retries, 3362 u8 valid_tx_ant, bool toggle_ant) 3363{ 3364 int i, j; 3365 __le32 ucode_rate; 3366 bool bottom_reached = false; 3367 int prev_rate_idx = rate->index; 3368 int end = LINK_QUAL_MAX_RETRY_NUM; 3369 int index = *rs_table_index; 3370 3371 for (i = 0; i < num_rates && index < end; i++) { 3372 for (j = 0; j < num_retries && index < end; j++, index++) { 3373 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3374 rate)); 3375 rs_table[index] = ucode_rate; 3376 if (toggle_ant) 3377 rs_toggle_antenna(valid_tx_ant, rate); 3378 } 3379 3380 prev_rate_idx = rate->index; 3381 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3382 if (bottom_reached && !is_legacy(rate)) 3383 break; 3384 } 3385 3386 if (!bottom_reached && !is_legacy(rate)) 3387 rate->index = prev_rate_idx; 3388 3389 *rs_table_index = index; 3390} 3391 3392/* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3393 * column the rate table should look like this: 3394 * 3395 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3396 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3397 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3398 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3399 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3400 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3401 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3402 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3403 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3404 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3405 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3406 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3407 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3408 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3409 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3410 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3411 */ 3412static void rs_build_rates_table(struct iwl_mvm *mvm, 3413 struct ieee80211_sta *sta, 3414 struct iwl_lq_sta *lq_sta, 3415 const struct rs_rate *initial_rate) 3416{ 3417 struct rs_rate rate; 3418 int num_rates, num_retries, index = 0; 3419 u8 valid_tx_ant = 0; 3420 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3421 bool toggle_ant = false; 3422 u32 color; 3423 3424 memcpy(&rate, initial_rate, sizeof(rate)); 3425 3426 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3427 3428 /* TODO: remove old API when min FW API hits 14 */ 3429 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3430 rs_stbc_allow(mvm, sta, lq_sta)) 3431 rate.stbc = true; 3432 3433 if (is_siso(&rate)) { 3434 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3435 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3436 } else if (is_mimo(&rate)) { 3437 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3438 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3439 } else { 3440 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3441 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3442 toggle_ant = true; 3443 } 3444 3445 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3446 num_rates, num_retries, valid_tx_ant, 3447 toggle_ant); 3448 3449 rs_get_lower_rate_down_column(lq_sta, &rate); 3450 3451 if (is_siso(&rate)) { 3452 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3453 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3454 lq_cmd->mimo_delim = index; 3455 } else if (is_legacy(&rate)) { 3456 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3457 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3458 } else { 3459 WARN_ON_ONCE(1); 3460 } 3461 3462 toggle_ant = true; 3463 3464 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3465 num_rates, num_retries, valid_tx_ant, 3466 toggle_ant); 3467 3468 rs_get_lower_rate_down_column(lq_sta, &rate); 3469 3470 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3471 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3472 3473 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3474 num_rates, num_retries, valid_tx_ant, 3475 toggle_ant); 3476 3477 /* update the color of the LQ command (as a counter at bits 1-3) */ 3478 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3479 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3480} 3481 3482struct rs_bfer_active_iter_data { 3483 struct ieee80211_sta *exclude_sta; 3484 struct iwl_mvm_sta *bfer_mvmsta; 3485}; 3486 3487static void rs_bfer_active_iter(void *_data, 3488 struct ieee80211_sta *sta) 3489{ 3490 struct rs_bfer_active_iter_data *data = _data; 3491 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3492 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3493 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3494 3495 if (sta == data->exclude_sta) 3496 return; 3497 3498 /* The current sta has BFER allowed */ 3499 if (ss_params & LQ_SS_BFER_ALLOWED) { 3500 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3501 3502 data->bfer_mvmsta = mvmsta; 3503 } 3504} 3505 3506static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3507{ 3508 int prio = -1; 3509 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3510 3511 switch (viftype) { 3512 case NL80211_IFTYPE_AP: 3513 case NL80211_IFTYPE_P2P_GO: 3514 prio = 3; 3515 break; 3516 case NL80211_IFTYPE_P2P_CLIENT: 3517 prio = 2; 3518 break; 3519 case NL80211_IFTYPE_STATION: 3520 prio = 1; 3521 break; 3522 default: 3523 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3524 prio = -1; 3525 } 3526 3527 return prio; 3528} 3529 3530/* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3531static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3532 struct iwl_mvm_sta *sta2) 3533{ 3534 int prio1 = rs_bfer_priority(sta1); 3535 int prio2 = rs_bfer_priority(sta2); 3536 3537 if (prio1 > prio2) 3538 return 1; 3539 if (prio1 < prio2) 3540 return -1; 3541 return 0; 3542} 3543 3544static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3545 struct ieee80211_sta *sta, 3546 struct iwl_lq_sta *lq_sta, 3547 const struct rs_rate *initial_rate) 3548{ 3549 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3550 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3551 struct rs_bfer_active_iter_data data = { 3552 .exclude_sta = sta, 3553 .bfer_mvmsta = NULL, 3554 }; 3555 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3556 u32 ss_params = LQ_SS_PARAMS_VALID; 3557 3558 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3559 goto out; 3560 3561#ifdef CONFIG_MAC80211_DEBUGFS 3562 /* Check if forcing the decision is configured. 3563 * Note that SISO is forced by not allowing STBC or BFER 3564 */ 3565 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3566 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3567 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3568 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3569 3570 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3571 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3572 lq_sta->pers.ss_force); 3573 goto out; 3574 } 3575#endif 3576 3577 if (lq_sta->stbc_capable) 3578 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3579 3580 if (!lq_sta->bfer_capable) 3581 goto out; 3582 3583 ieee80211_iterate_stations_atomic(mvm->hw, 3584 rs_bfer_active_iter, 3585 &data); 3586 bfer_mvmsta = data.bfer_mvmsta; 3587 3588 /* This code is safe as it doesn't run concurrently for different 3589 * stations. This is guaranteed by the fact that calls to 3590 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3591 */ 3592 if (!bfer_mvmsta) { 3593 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3594 3595 ss_params |= LQ_SS_BFER_ALLOWED; 3596 goto out; 3597 } 3598 3599 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3600 bfer_mvmsta->sta_id); 3601 3602 /* Disallow BFER on another STA if active and we're a higher priority */ 3603 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3604 struct iwl_lq_cmd *bfersta_lq_cmd = 3605 &bfer_mvmsta->lq_sta.rs_drv.lq; 3606 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3607 3608 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3609 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3610 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd); 3611 3612 ss_params |= LQ_SS_BFER_ALLOWED; 3613 IWL_DEBUG_RATE(mvm, 3614 "Lower priority BFER sta found (%d). Switch BFER\n", 3615 bfer_mvmsta->sta_id); 3616 } 3617out: 3618 lq_cmd->ss_params = cpu_to_le32(ss_params); 3619} 3620 3621static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3622 struct ieee80211_sta *sta, 3623 struct iwl_lq_sta *lq_sta, 3624 const struct rs_rate *initial_rate) 3625{ 3626 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3627 struct iwl_mvm_sta *mvmsta; 3628 struct iwl_mvm_vif *mvmvif; 3629 3630 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3631 lq_cmd->agg_time_limit = 3632 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3633 3634#ifdef CONFIG_MAC80211_DEBUGFS 3635 if (lq_sta->pers.dbg_fixed_rate) { 3636 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3637 lq_sta->band, 3638 lq_sta->pers.dbg_fixed_rate); 3639 return; 3640 } 3641#endif 3642 if (WARN_ON_ONCE(!sta || !initial_rate)) 3643 return; 3644 3645 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3646 3647 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3648 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3649 3650 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3651 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3652 3653 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3654 num_of_ant(initial_rate->ant) == 1) 3655 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3656 3657 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3658 3659 /* 3660 * In case of low latency, tell the firmware to leave a frame in the 3661 * Tx Fifo so that it can start a transaction in the same TxOP. This 3662 * basically allows the firmware to send bursts. 3663 */ 3664 if (iwl_mvm_vif_low_latency(mvmvif)) 3665 lq_cmd->agg_frame_cnt_limit--; 3666 3667 if (mvmsta->vif->p2p) 3668 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3669 3670 lq_cmd->agg_time_limit = 3671 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3672} 3673 3674static void *rs_alloc(struct ieee80211_hw *hw) 3675{ 3676 return hw->priv; 3677} 3678 3679/* rate scale requires free function to be implemented */ 3680static void rs_free(void *mvm_rate) 3681{ 3682 return; 3683} 3684 3685static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3686{ 3687 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3688 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3689 3690 IWL_DEBUG_RATE(mvm, "enter\n"); 3691 IWL_DEBUG_RATE(mvm, "leave\n"); 3692} 3693 3694int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3695{ 3696 3697 char *type, *bw; 3698 u8 mcs = 0, nss = 0; 3699 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3700 3701 if (!(rate & RATE_MCS_HT_MSK) && 3702 !(rate & RATE_MCS_VHT_MSK) && 3703 !(rate & RATE_MCS_HE_MSK)) { 3704 int index = iwl_hwrate_to_plcp_idx(rate); 3705 3706 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps", 3707 rs_pretty_ant(ant), 3708 index == IWL_RATE_INVALID ? "BAD" : 3709 iwl_rate_mcs[index].mbps); 3710 } 3711 3712 if (rate & RATE_MCS_VHT_MSK) { 3713 type = "VHT"; 3714 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3715 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3716 >> RATE_VHT_MCS_NSS_POS) + 1; 3717 } else if (rate & RATE_MCS_HT_MSK) { 3718 type = "HT"; 3719 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3720 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3721 >> RATE_HT_MCS_NSS_POS) + 1; 3722 } else if (rate & RATE_MCS_HE_MSK) { 3723 type = "HE"; 3724 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3725 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3726 >> RATE_VHT_MCS_NSS_POS) + 1; 3727 } else { 3728 type = "Unknown"; /* shouldn't happen */ 3729 } 3730 3731 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3732 case RATE_MCS_CHAN_WIDTH_20: 3733 bw = "20Mhz"; 3734 break; 3735 case RATE_MCS_CHAN_WIDTH_40: 3736 bw = "40Mhz"; 3737 break; 3738 case RATE_MCS_CHAN_WIDTH_80: 3739 bw = "80Mhz"; 3740 break; 3741 case RATE_MCS_CHAN_WIDTH_160: 3742 bw = "160Mhz"; 3743 break; 3744 default: 3745 bw = "BAD BW"; 3746 } 3747 3748 return scnprintf(buf, bufsz, 3749 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s", 3750 rate, type, rs_pretty_ant(ant), bw, mcs, nss, 3751 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3752 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3753 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3754 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "", 3755 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3756} 3757 3758#ifdef CONFIG_MAC80211_DEBUGFS 3759/** 3760 * Program the device to use fixed rate for frame transmit 3761 * This is for debugging/testing only 3762 * once the device start use fixed rate, we need to reload the module 3763 * to being back the normal operation. 3764 */ 3765static void rs_program_fix_rate(struct iwl_mvm *mvm, 3766 struct iwl_lq_sta *lq_sta) 3767{ 3768 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3769 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3770 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3771 3772 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3773 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3774 3775 if (lq_sta->pers.dbg_fixed_rate) { 3776 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3777 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq); 3778 } 3779} 3780 3781static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3782 const char __user *user_buf, size_t count, loff_t *ppos) 3783{ 3784 struct iwl_lq_sta *lq_sta = file->private_data; 3785 struct iwl_mvm *mvm; 3786 char buf[64]; 3787 size_t buf_size; 3788 u32 parsed_rate; 3789 3790 mvm = lq_sta->pers.drv; 3791 memset(buf, 0, sizeof(buf)); 3792 buf_size = min(count, sizeof(buf) - 1); 3793 if (copy_from_user(buf, user_buf, buf_size)) 3794 return -EFAULT; 3795 3796 if (sscanf(buf, "%x", &parsed_rate) == 1) 3797 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3798 else 3799 lq_sta->pers.dbg_fixed_rate = 0; 3800 3801 rs_program_fix_rate(mvm, lq_sta); 3802 3803 return count; 3804} 3805 3806static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3807 char __user *user_buf, size_t count, loff_t *ppos) 3808{ 3809 char *buff; 3810 int desc = 0; 3811 int i = 0; 3812 ssize_t ret; 3813 static const size_t bufsz = 2048; 3814 3815 struct iwl_lq_sta *lq_sta = file->private_data; 3816 struct iwl_mvm_sta *mvmsta = 3817 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3818 struct iwl_mvm *mvm; 3819 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3820 struct rs_rate *rate = &tbl->rate; 3821 u32 ss_params; 3822 3823 mvm = lq_sta->pers.drv; 3824 buff = kmalloc(bufsz, GFP_KERNEL); 3825 if (!buff) 3826 return -ENOMEM; 3827 3828 desc += scnprintf(buff + desc, bufsz - desc, 3829 "sta_id %d\n", lq_sta->lq.sta_id); 3830 desc += scnprintf(buff + desc, bufsz - desc, 3831 "failed=%d success=%d rate=0%lX\n", 3832 lq_sta->total_failed, lq_sta->total_success, 3833 lq_sta->active_legacy_rate); 3834 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3835 lq_sta->pers.dbg_fixed_rate); 3836 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3837 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3838 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3839 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3840 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3841 (is_legacy(rate)) ? "legacy" : 3842 is_vht(rate) ? "VHT" : "HT"); 3843 if (!is_legacy(rate)) { 3844 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3845 (is_siso(rate)) ? "SISO" : "MIMO2"); 3846 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3847 (is_ht20(rate)) ? "20MHz" : 3848 (is_ht40(rate)) ? "40MHz" : 3849 (is_ht80(rate)) ? "80MHz" : 3850 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3851 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3852 (rate->sgi) ? "SGI" : "NGI", 3853 (rate->ldpc) ? "LDPC" : "BCC", 3854 (lq_sta->is_agg) ? "AGG on" : "", 3855 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3856 } 3857 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3858 lq_sta->last_rate_n_flags); 3859 desc += scnprintf(buff + desc, bufsz - desc, 3860 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3861 lq_sta->lq.flags, 3862 lq_sta->lq.mimo_delim, 3863 lq_sta->lq.single_stream_ant_msk, 3864 lq_sta->lq.dual_stream_ant_msk); 3865 3866 desc += scnprintf(buff + desc, bufsz - desc, 3867 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3868 le16_to_cpu(lq_sta->lq.agg_time_limit), 3869 lq_sta->lq.agg_disable_start_th, 3870 lq_sta->lq.agg_frame_cnt_limit); 3871 3872 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3873 lq_sta->lq.reduced_tpc); 3874 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3875 desc += scnprintf(buff + desc, bufsz - desc, 3876 "single stream params: %s%s%s%s\n", 3877 (ss_params & LQ_SS_PARAMS_VALID) ? 3878 "VALID" : "INVALID", 3879 (ss_params & LQ_SS_BFER_ALLOWED) ? 3880 ", BFER" : "", 3881 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3882 ", STBC" : "", 3883 (ss_params & LQ_SS_FORCE) ? 3884 ", FORCE" : ""); 3885 desc += scnprintf(buff + desc, bufsz - desc, 3886 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3887 lq_sta->lq.initial_rate_index[0], 3888 lq_sta->lq.initial_rate_index[1], 3889 lq_sta->lq.initial_rate_index[2], 3890 lq_sta->lq.initial_rate_index[3]); 3891 3892 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3893 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3894 3895 desc += scnprintf(buff + desc, bufsz - desc, 3896 " rate[%d] 0x%X ", i, r); 3897 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3898 if (desc < bufsz - 1) 3899 buff[desc++] = '\n'; 3900 } 3901 3902 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3903 kfree(buff); 3904 return ret; 3905} 3906 3907static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3908 .write = rs_sta_dbgfs_scale_table_write, 3909 .read = rs_sta_dbgfs_scale_table_read, 3910 .open = simple_open, 3911 .llseek = default_llseek, 3912}; 3913static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3914 char __user *user_buf, size_t count, loff_t *ppos) 3915{ 3916 char *buff; 3917 int desc = 0; 3918 int i, j; 3919 ssize_t ret; 3920 struct iwl_scale_tbl_info *tbl; 3921 struct rs_rate *rate; 3922 struct iwl_lq_sta *lq_sta = file->private_data; 3923 3924 buff = kmalloc(1024, GFP_KERNEL); 3925 if (!buff) 3926 return -ENOMEM; 3927 3928 for (i = 0; i < LQ_SIZE; i++) { 3929 tbl = &(lq_sta->lq_info[i]); 3930 rate = &tbl->rate; 3931 desc += sprintf(buff+desc, 3932 "%s type=%d SGI=%d BW=%s DUP=0\n" 3933 "index=%d\n", 3934 lq_sta->active_tbl == i ? "*" : "x", 3935 rate->type, 3936 rate->sgi, 3937 is_ht20(rate) ? "20MHz" : 3938 is_ht40(rate) ? "40MHz" : 3939 is_ht80(rate) ? "80MHz" : 3940 is_ht160(rate) ? "160MHz" : "ERR", 3941 rate->index); 3942 for (j = 0; j < IWL_RATE_COUNT; j++) { 3943 desc += sprintf(buff+desc, 3944 "counter=%d success=%d %%=%d\n", 3945 tbl->win[j].counter, 3946 tbl->win[j].success_counter, 3947 tbl->win[j].success_ratio); 3948 } 3949 } 3950 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3951 kfree(buff); 3952 return ret; 3953} 3954 3955static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3956 .read = rs_sta_dbgfs_stats_table_read, 3957 .open = simple_open, 3958 .llseek = default_llseek, 3959}; 3960 3961static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3962 char __user *user_buf, 3963 size_t count, loff_t *ppos) 3964{ 3965 static const char * const column_name[] = { 3966 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3967 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3968 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3969 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3970 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3971 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3972 [RS_COLUMN_MIMO2] = "MIMO2", 3973 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3974 }; 3975 3976 static const char * const rate_name[] = { 3977 [IWL_RATE_1M_INDEX] = "1M", 3978 [IWL_RATE_2M_INDEX] = "2M", 3979 [IWL_RATE_5M_INDEX] = "5.5M", 3980 [IWL_RATE_11M_INDEX] = "11M", 3981 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3982 [IWL_RATE_9M_INDEX] = "9M", 3983 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3984 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3985 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3986 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3987 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3988 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3989 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3990 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3991 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3992 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3993 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3994 }; 3995 3996 char *buff, *pos, *endpos; 3997 int col, rate; 3998 ssize_t ret; 3999 struct iwl_lq_sta *lq_sta = file->private_data; 4000 struct rs_rate_stats *stats; 4001 static const size_t bufsz = 1024; 4002 4003 buff = kmalloc(bufsz, GFP_KERNEL); 4004 if (!buff) 4005 return -ENOMEM; 4006 4007 pos = buff; 4008 endpos = pos + bufsz; 4009 4010 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 4011 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 4012 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 4013 pos += scnprintf(pos, endpos - pos, "\n"); 4014 4015 for (col = 0; col < RS_COLUMN_COUNT; col++) { 4016 pos += scnprintf(pos, endpos - pos, 4017 "%s,", column_name[col]); 4018 4019 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 4020 stats = &(lq_sta->pers.tx_stats[col][rate]); 4021 pos += scnprintf(pos, endpos - pos, 4022 "%llu/%llu,", 4023 stats->success, 4024 stats->total); 4025 } 4026 pos += scnprintf(pos, endpos - pos, "\n"); 4027 } 4028 4029 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 4030 kfree(buff); 4031 return ret; 4032} 4033 4034static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 4035 const char __user *user_buf, 4036 size_t count, loff_t *ppos) 4037{ 4038 struct iwl_lq_sta *lq_sta = file->private_data; 4039 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 4040 4041 return count; 4042} 4043 4044static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 4045 .read = rs_sta_dbgfs_drv_tx_stats_read, 4046 .write = rs_sta_dbgfs_drv_tx_stats_write, 4047 .open = simple_open, 4048 .llseek = default_llseek, 4049}; 4050 4051static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 4052 char __user *user_buf, 4053 size_t count, loff_t *ppos) 4054{ 4055 struct iwl_lq_sta *lq_sta = file->private_data; 4056 char buf[12]; 4057 int bufsz = sizeof(buf); 4058 int pos = 0; 4059 static const char * const ss_force_name[] = { 4060 [RS_SS_FORCE_NONE] = "none", 4061 [RS_SS_FORCE_STBC] = "stbc", 4062 [RS_SS_FORCE_BFER] = "bfer", 4063 [RS_SS_FORCE_SISO] = "siso", 4064 }; 4065 4066 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4067 ss_force_name[lq_sta->pers.ss_force]); 4068 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4069} 4070 4071static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4072 size_t count, loff_t *ppos) 4073{ 4074 struct iwl_mvm *mvm = lq_sta->pers.drv; 4075 int ret = 0; 4076 4077 if (!strncmp("none", buf, 4)) { 4078 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4079 } else if (!strncmp("siso", buf, 4)) { 4080 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4081 } else if (!strncmp("stbc", buf, 4)) { 4082 if (lq_sta->stbc_capable) { 4083 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4084 } else { 4085 IWL_ERR(mvm, 4086 "can't force STBC. peer doesn't support\n"); 4087 ret = -EINVAL; 4088 } 4089 } else if (!strncmp("bfer", buf, 4)) { 4090 if (lq_sta->bfer_capable) { 4091 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4092 } else { 4093 IWL_ERR(mvm, 4094 "can't force BFER. peer doesn't support\n"); 4095 ret = -EINVAL; 4096 } 4097 } else { 4098 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4099 ret = -EINVAL; 4100 } 4101 return ret ?: count; 4102} 4103 4104#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4105 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4106#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4107 debugfs_create_file(#name, mode, parent, lq_sta, \ 4108 &iwl_dbgfs_##name##_ops); \ 4109 } while (0) 4110 4111MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4112 4113static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4114 struct dentry *dir) 4115{ 4116 struct iwl_lq_sta *lq_sta = priv_sta; 4117 struct iwl_mvm_sta *mvmsta; 4118 4119 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4120 4121 if (!mvmsta->vif) 4122 return; 4123 4124 debugfs_create_file("rate_scale_table", 0600, dir, 4125 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4126 debugfs_create_file("rate_stats_table", 0400, dir, 4127 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4128 debugfs_create_file("drv_tx_stats", 0600, dir, 4129 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4130 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4131 &lq_sta->tx_agg_tid_en); 4132 debugfs_create_u8("reduced_tpc", 0600, dir, 4133 &lq_sta->pers.dbg_fixed_txp_reduction); 4134 4135 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4136} 4137#endif 4138 4139/* 4140 * Initialization of rate scaling information is done by driver after 4141 * the station is added. Since mac80211 calls this function before a 4142 * station is added we ignore it. 4143 */ 4144static void rs_rate_init_ops(void *mvm_r, 4145 struct ieee80211_supported_band *sband, 4146 struct cfg80211_chan_def *chandef, 4147 struct ieee80211_sta *sta, void *mvm_sta) 4148{ 4149} 4150 4151/* ops for rate scaling implemented in the driver */ 4152static const struct rate_control_ops rs_mvm_ops_drv = { 4153 .name = RS_NAME, 4154 .tx_status = rs_drv_mac80211_tx_status, 4155 .get_rate = rs_drv_get_rate, 4156 .rate_init = rs_rate_init_ops, 4157 .alloc = rs_alloc, 4158 .free = rs_free, 4159 .alloc_sta = rs_drv_alloc_sta, 4160 .free_sta = rs_free_sta, 4161 .rate_update = rs_drv_rate_update, 4162#ifdef CONFIG_MAC80211_DEBUGFS 4163 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4164#endif 4165 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4166}; 4167 4168void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4169 enum nl80211_band band, bool update) 4170{ 4171 if (iwl_mvm_has_tlc_offload(mvm)) { 4172 rs_fw_rate_init(mvm, sta, band, update); 4173 } else { 4174 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 4175 4176 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock); 4177 rs_drv_rate_init(mvm, sta, band); 4178 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 4179 } 4180} 4181 4182int iwl_mvm_rate_control_register(void) 4183{ 4184 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4185} 4186 4187void iwl_mvm_rate_control_unregister(void) 4188{ 4189 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4190} 4191 4192static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4193 bool enable) 4194{ 4195 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4196 4197 lockdep_assert_held(&mvm->mutex); 4198 4199 if (enable) { 4200 if (mvmsta->tx_protection == 0) 4201 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4202 mvmsta->tx_protection++; 4203 } else { 4204 mvmsta->tx_protection--; 4205 if (mvmsta->tx_protection == 0) 4206 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4207 } 4208 4209 return iwl_mvm_send_lq_cmd(mvm, lq); 4210} 4211 4212/** 4213 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4214 * @mvmsta: The station 4215 * @enable: Enable Tx protection? 4216 */ 4217int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4218 bool enable) 4219{ 4220 if (iwl_mvm_has_tlc_offload(mvm)) 4221 return rs_fw_tx_protection(mvm, mvmsta, enable); 4222 else 4223 return rs_drv_tx_protection(mvm, mvmsta, enable); 4224} 4225