1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014, 2018 - 2021 Intel Corporation. All rights reserved. 5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 7 *****************************************************************************/ 8 #include <linux/kernel.h> 9 #include <linux/skbuff.h> 10 #include <linux/slab.h> 11 #include <net/mac80211.h> 12 13 #include <linux/netdevice.h> 14 #include <linux/etherdevice.h> 15 #include <linux/delay.h> 16 17 #include <linux/workqueue.h> 18 #include "rs.h" 19 #include "fw-api.h" 20 #include "sta.h" 21 #include "iwl-op-mode.h" 22 #include "mvm.h" 23 #include "debugfs.h" 24 25 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 26 27 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 28 * Use this macro when dealing with thresholds consts set as a percentage 29 */ 30 #define RS_PERCENT(x) (128 * x) 31 32 static u8 rs_ht_to_legacy[] = { 33 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 34 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 35 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 36 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 37 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 38 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 39 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 40 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 41 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 42 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 43 }; 44 45 static const u8 ant_toggle_lookup[] = { 46 [ANT_NONE] = ANT_NONE, 47 [ANT_A] = ANT_B, 48 [ANT_B] = ANT_A, 49 [ANT_AB] = ANT_AB, 50 }; 51 52 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 53 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 54 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 55 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 56 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 57 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 58 IWL_RATE_##rp##M_INDEX, \ 59 IWL_RATE_##rn##M_INDEX } 60 61 #define IWL_DECLARE_MCS_RATE(s) \ 62 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 63 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 64 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 65 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 66 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 67 IWL_RATE_INVM_INDEX, \ 68 IWL_RATE_INVM_INDEX } 69 70 /* 71 * Parameter order: 72 * rate, ht rate, prev rate, next rate 73 * 74 * If there isn't a valid next or previous rate then INV is used which 75 * maps to IWL_RATE_INVALID 76 * 77 */ 78 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 79 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 80 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 81 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 82 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 83 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 84 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 85 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 86 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 87 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 88 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 89 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 90 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 91 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 92 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 93 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 94 }; 95 96 enum rs_action { 97 RS_ACTION_STAY = 0, 98 RS_ACTION_DOWNSCALE = -1, 99 RS_ACTION_UPSCALE = 1, 100 }; 101 102 enum rs_column_mode { 103 RS_INVALID = 0, 104 RS_LEGACY, 105 RS_SISO, 106 RS_MIMO2, 107 }; 108 109 #define MAX_NEXT_COLUMNS 7 110 #define MAX_COLUMN_CHECKS 3 111 112 struct rs_tx_column; 113 114 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 115 struct ieee80211_sta *sta, 116 struct rs_rate *rate, 117 const struct rs_tx_column *next_col); 118 119 struct rs_tx_column { 120 enum rs_column_mode mode; 121 u8 ant; 122 bool sgi; 123 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 124 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 125 }; 126 127 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 128 struct rs_rate *rate, 129 const struct rs_tx_column *next_col) 130 { 131 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 132 } 133 134 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 135 struct rs_rate *rate, 136 const struct rs_tx_column *next_col) 137 { 138 if (!sta->ht_cap.ht_supported) 139 return false; 140 141 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 142 return false; 143 144 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 145 return false; 146 147 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 148 return false; 149 150 if (mvm->nvm_data->sku_cap_mimo_disabled) 151 return false; 152 153 return true; 154 } 155 156 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 157 struct rs_rate *rate, 158 const struct rs_tx_column *next_col) 159 { 160 if (!sta->ht_cap.ht_supported) 161 return false; 162 163 return true; 164 } 165 166 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 167 struct rs_rate *rate, 168 const struct rs_tx_column *next_col) 169 { 170 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 171 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 172 173 if (is_ht20(rate) && (ht_cap->cap & 174 IEEE80211_HT_CAP_SGI_20)) 175 return true; 176 if (is_ht40(rate) && (ht_cap->cap & 177 IEEE80211_HT_CAP_SGI_40)) 178 return true; 179 if (is_ht80(rate) && (vht_cap->cap & 180 IEEE80211_VHT_CAP_SHORT_GI_80)) 181 return true; 182 if (is_ht160(rate) && (vht_cap->cap & 183 IEEE80211_VHT_CAP_SHORT_GI_160)) 184 return true; 185 186 return false; 187 } 188 189 static const struct rs_tx_column rs_tx_columns[] = { 190 [RS_COLUMN_LEGACY_ANT_A] = { 191 .mode = RS_LEGACY, 192 .ant = ANT_A, 193 .next_columns = { 194 RS_COLUMN_LEGACY_ANT_B, 195 RS_COLUMN_SISO_ANT_A, 196 RS_COLUMN_MIMO2, 197 RS_COLUMN_INVALID, 198 RS_COLUMN_INVALID, 199 RS_COLUMN_INVALID, 200 RS_COLUMN_INVALID, 201 }, 202 .checks = { 203 rs_ant_allow, 204 }, 205 }, 206 [RS_COLUMN_LEGACY_ANT_B] = { 207 .mode = RS_LEGACY, 208 .ant = ANT_B, 209 .next_columns = { 210 RS_COLUMN_LEGACY_ANT_A, 211 RS_COLUMN_SISO_ANT_B, 212 RS_COLUMN_MIMO2, 213 RS_COLUMN_INVALID, 214 RS_COLUMN_INVALID, 215 RS_COLUMN_INVALID, 216 RS_COLUMN_INVALID, 217 }, 218 .checks = { 219 rs_ant_allow, 220 }, 221 }, 222 [RS_COLUMN_SISO_ANT_A] = { 223 .mode = RS_SISO, 224 .ant = ANT_A, 225 .next_columns = { 226 RS_COLUMN_SISO_ANT_B, 227 RS_COLUMN_MIMO2, 228 RS_COLUMN_SISO_ANT_A_SGI, 229 RS_COLUMN_LEGACY_ANT_A, 230 RS_COLUMN_LEGACY_ANT_B, 231 RS_COLUMN_INVALID, 232 RS_COLUMN_INVALID, 233 }, 234 .checks = { 235 rs_siso_allow, 236 rs_ant_allow, 237 }, 238 }, 239 [RS_COLUMN_SISO_ANT_B] = { 240 .mode = RS_SISO, 241 .ant = ANT_B, 242 .next_columns = { 243 RS_COLUMN_SISO_ANT_A, 244 RS_COLUMN_MIMO2, 245 RS_COLUMN_SISO_ANT_B_SGI, 246 RS_COLUMN_LEGACY_ANT_A, 247 RS_COLUMN_LEGACY_ANT_B, 248 RS_COLUMN_INVALID, 249 RS_COLUMN_INVALID, 250 }, 251 .checks = { 252 rs_siso_allow, 253 rs_ant_allow, 254 }, 255 }, 256 [RS_COLUMN_SISO_ANT_A_SGI] = { 257 .mode = RS_SISO, 258 .ant = ANT_A, 259 .sgi = true, 260 .next_columns = { 261 RS_COLUMN_SISO_ANT_B_SGI, 262 RS_COLUMN_MIMO2_SGI, 263 RS_COLUMN_SISO_ANT_A, 264 RS_COLUMN_LEGACY_ANT_A, 265 RS_COLUMN_LEGACY_ANT_B, 266 RS_COLUMN_INVALID, 267 RS_COLUMN_INVALID, 268 }, 269 .checks = { 270 rs_siso_allow, 271 rs_ant_allow, 272 rs_sgi_allow, 273 }, 274 }, 275 [RS_COLUMN_SISO_ANT_B_SGI] = { 276 .mode = RS_SISO, 277 .ant = ANT_B, 278 .sgi = true, 279 .next_columns = { 280 RS_COLUMN_SISO_ANT_A_SGI, 281 RS_COLUMN_MIMO2_SGI, 282 RS_COLUMN_SISO_ANT_B, 283 RS_COLUMN_LEGACY_ANT_A, 284 RS_COLUMN_LEGACY_ANT_B, 285 RS_COLUMN_INVALID, 286 RS_COLUMN_INVALID, 287 }, 288 .checks = { 289 rs_siso_allow, 290 rs_ant_allow, 291 rs_sgi_allow, 292 }, 293 }, 294 [RS_COLUMN_MIMO2] = { 295 .mode = RS_MIMO2, 296 .ant = ANT_AB, 297 .next_columns = { 298 RS_COLUMN_SISO_ANT_A, 299 RS_COLUMN_MIMO2_SGI, 300 RS_COLUMN_LEGACY_ANT_A, 301 RS_COLUMN_LEGACY_ANT_B, 302 RS_COLUMN_INVALID, 303 RS_COLUMN_INVALID, 304 RS_COLUMN_INVALID, 305 }, 306 .checks = { 307 rs_mimo_allow, 308 }, 309 }, 310 [RS_COLUMN_MIMO2_SGI] = { 311 .mode = RS_MIMO2, 312 .ant = ANT_AB, 313 .sgi = true, 314 .next_columns = { 315 RS_COLUMN_SISO_ANT_A_SGI, 316 RS_COLUMN_MIMO2, 317 RS_COLUMN_LEGACY_ANT_A, 318 RS_COLUMN_LEGACY_ANT_B, 319 RS_COLUMN_INVALID, 320 RS_COLUMN_INVALID, 321 RS_COLUMN_INVALID, 322 }, 323 .checks = { 324 rs_mimo_allow, 325 rs_sgi_allow, 326 }, 327 }, 328 }; 329 330 static inline u8 rs_extract_rate(u32 rate_n_flags) 331 { 332 /* also works for HT because bits 7:6 are zero there */ 333 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1); 334 } 335 336 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 337 { 338 int idx = 0; 339 340 if (rate_n_flags & RATE_MCS_HT_MSK_V1) { 341 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1; 342 idx += IWL_RATE_MCS_0_INDEX; 343 344 /* skip 9M not supported in HT*/ 345 if (idx >= IWL_RATE_9M_INDEX) 346 idx += 1; 347 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 348 return idx; 349 } else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 || 350 rate_n_flags & RATE_MCS_HE_MSK_V1) { 351 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 352 idx += IWL_RATE_MCS_0_INDEX; 353 354 /* skip 9M not supported in VHT*/ 355 if (idx >= IWL_RATE_9M_INDEX) 356 idx++; 357 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 358 return idx; 359 if ((rate_n_flags & RATE_MCS_HE_MSK_V1) && 360 idx <= IWL_LAST_HE_RATE) 361 return idx; 362 } else { 363 /* legacy rate format, search for match in table */ 364 365 u8 legacy_rate = rs_extract_rate(rate_n_flags); 366 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 367 if (iwl_rates[idx].plcp == legacy_rate) 368 return idx; 369 } 370 371 return IWL_RATE_INVALID; 372 } 373 374 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 375 struct ieee80211_sta *sta, 376 struct iwl_lq_sta *lq_sta, 377 int tid, bool ndp); 378 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 379 struct ieee80211_sta *sta, 380 struct iwl_lq_sta *lq_sta, 381 const struct rs_rate *initial_rate); 382 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 383 384 /* 385 * The following tables contain the expected throughput metrics for all rates 386 * 387 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 388 * 389 * where invalid entries are zeros. 390 * 391 * CCK rates are only valid in legacy table and will only be used in G 392 * (2.4 GHz) band. 393 */ 394 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 395 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 396 }; 397 398 /* Expected TpT tables. 4 indexes: 399 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 400 */ 401 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 402 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 403 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 404 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 405 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 406 }; 407 408 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 409 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 410 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 411 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 412 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 413 }; 414 415 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 416 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 417 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 418 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 419 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 420 }; 421 422 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 423 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 424 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 425 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 426 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 427 }; 428 429 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 430 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 431 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 432 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 433 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 434 }; 435 436 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 437 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 438 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 439 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 440 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 441 }; 442 443 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 444 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 445 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 446 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 447 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 448 }; 449 450 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 451 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 452 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 453 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 454 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 455 }; 456 457 #define MCS_INDEX_PER_STREAM (8) 458 459 static const char *rs_pretty_lq_type(enum iwl_table_type type) 460 { 461 static const char * const lq_types[] = { 462 [LQ_NONE] = "NONE", 463 [LQ_LEGACY_A] = "LEGACY_A", 464 [LQ_LEGACY_G] = "LEGACY_G", 465 [LQ_HT_SISO] = "HT SISO", 466 [LQ_HT_MIMO2] = "HT MIMO", 467 [LQ_VHT_SISO] = "VHT SISO", 468 [LQ_VHT_MIMO2] = "VHT MIMO", 469 [LQ_HE_SISO] = "HE SISO", 470 [LQ_HE_MIMO2] = "HE MIMO", 471 }; 472 473 if (type < LQ_NONE || type >= LQ_MAX) 474 return "UNKNOWN"; 475 476 return lq_types[type]; 477 } 478 479 static char *rs_pretty_rate(const struct rs_rate *rate) 480 { 481 static char buf[40]; 482 static const char * const legacy_rates[] = { 483 [IWL_RATE_1M_INDEX] = "1M", 484 [IWL_RATE_2M_INDEX] = "2M", 485 [IWL_RATE_5M_INDEX] = "5.5M", 486 [IWL_RATE_11M_INDEX] = "11M", 487 [IWL_RATE_6M_INDEX] = "6M", 488 [IWL_RATE_9M_INDEX] = "9M", 489 [IWL_RATE_12M_INDEX] = "12M", 490 [IWL_RATE_18M_INDEX] = "18M", 491 [IWL_RATE_24M_INDEX] = "24M", 492 [IWL_RATE_36M_INDEX] = "36M", 493 [IWL_RATE_48M_INDEX] = "48M", 494 [IWL_RATE_54M_INDEX] = "54M", 495 }; 496 static const char *const ht_vht_rates[] = { 497 [IWL_RATE_MCS_0_INDEX] = "MCS0", 498 [IWL_RATE_MCS_1_INDEX] = "MCS1", 499 [IWL_RATE_MCS_2_INDEX] = "MCS2", 500 [IWL_RATE_MCS_3_INDEX] = "MCS3", 501 [IWL_RATE_MCS_4_INDEX] = "MCS4", 502 [IWL_RATE_MCS_5_INDEX] = "MCS5", 503 [IWL_RATE_MCS_6_INDEX] = "MCS6", 504 [IWL_RATE_MCS_7_INDEX] = "MCS7", 505 [IWL_RATE_MCS_8_INDEX] = "MCS8", 506 [IWL_RATE_MCS_9_INDEX] = "MCS9", 507 }; 508 const char *rate_str; 509 510 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 511 rate_str = legacy_rates[rate->index]; 512 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 513 (rate->index >= IWL_RATE_MCS_0_INDEX) && 514 (rate->index <= IWL_RATE_MCS_9_INDEX)) 515 rate_str = ht_vht_rates[rate->index]; 516 else 517 rate_str = "BAD_RATE"; 518 519 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 520 iwl_rs_pretty_ant(rate->ant), rate_str); 521 return buf; 522 } 523 524 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 525 const char *prefix) 526 { 527 IWL_DEBUG_RATE(mvm, 528 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 529 prefix, rs_pretty_rate(rate), rate->bw, 530 rate->sgi, rate->ldpc, rate->stbc); 531 } 532 533 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 534 { 535 window->data = 0; 536 window->success_counter = 0; 537 window->success_ratio = IWL_INVALID_VALUE; 538 window->counter = 0; 539 window->average_tpt = IWL_INVALID_VALUE; 540 } 541 542 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 543 struct iwl_scale_tbl_info *tbl) 544 { 545 int i; 546 547 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 548 for (i = 0; i < IWL_RATE_COUNT; i++) 549 rs_rate_scale_clear_window(&tbl->win[i]); 550 551 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 552 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 553 } 554 555 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 556 { 557 return (ant_type & valid_antenna) == ant_type; 558 } 559 560 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 561 struct iwl_lq_sta *lq_data, u8 tid, 562 struct ieee80211_sta *sta) 563 { 564 int ret; 565 566 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 567 sta->addr, tid); 568 569 /* start BA session until the peer sends del BA */ 570 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 571 if (ret == -EAGAIN) { 572 /* 573 * driver and mac80211 is out of sync 574 * this might be cause by reloading firmware 575 * stop the tx ba session here 576 */ 577 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 578 tid); 579 ieee80211_stop_tx_ba_session(sta, tid); 580 } 581 return ret; 582 } 583 584 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 585 u8 tid, struct iwl_lq_sta *lq_sta, 586 struct ieee80211_sta *sta) 587 { 588 struct iwl_mvm_tid_data *tid_data; 589 590 /* 591 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 592 * when the frame is not QoS 593 */ 594 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 595 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 596 tid, IWL_MAX_TID_COUNT); 597 return; 598 } else if (tid == IWL_MAX_TID_COUNT) { 599 return; 600 } 601 602 tid_data = &mvmsta->tid_data[tid]; 603 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 604 tid_data->state == IWL_AGG_OFF && 605 (lq_sta->tx_agg_tid_en & BIT(tid)) && 606 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 607 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 608 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 609 tid_data->state = IWL_AGG_QUEUED; 610 } 611 } 612 613 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 614 { 615 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 616 !!(rate_n_flags & RATE_MCS_ANT_B_MSK); 617 } 618 619 /* 620 * Static function to get the expected throughput from an iwl_scale_tbl_info 621 * that wraps a NULL pointer check 622 */ 623 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 624 { 625 if (tbl->expected_tpt) 626 return tbl->expected_tpt[rs_index]; 627 return 0; 628 } 629 630 /* 631 * rs_collect_tx_data - Update the success/failure sliding window 632 * 633 * We keep a sliding window of the last 62 packets transmitted 634 * at this rate. window->data contains the bitmask of successful 635 * packets. 636 */ 637 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 638 struct iwl_scale_tbl_info *tbl, 639 int scale_index, int attempts, int successes, 640 struct iwl_rate_scale_data *window) 641 { 642 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 643 s32 fail_count, tpt; 644 645 /* Get expected throughput */ 646 tpt = get_expected_tpt(tbl, scale_index); 647 648 /* 649 * Keep track of only the latest 62 tx frame attempts in this rate's 650 * history window; anything older isn't really relevant any more. 651 * If we have filled up the sliding window, drop the oldest attempt; 652 * if the oldest attempt (highest bit in bitmap) shows "success", 653 * subtract "1" from the success counter (this is the main reason 654 * we keep these bitmaps!). 655 */ 656 while (attempts > 0) { 657 if (window->counter >= IWL_RATE_MAX_WINDOW) { 658 /* remove earliest */ 659 window->counter = IWL_RATE_MAX_WINDOW - 1; 660 661 if (window->data & mask) { 662 window->data &= ~mask; 663 window->success_counter--; 664 } 665 } 666 667 /* Increment frames-attempted counter */ 668 window->counter++; 669 670 /* Shift bitmap by one frame to throw away oldest history */ 671 window->data <<= 1; 672 673 /* Mark the most recent #successes attempts as successful */ 674 if (successes > 0) { 675 window->success_counter++; 676 window->data |= 0x1; 677 successes--; 678 } 679 680 attempts--; 681 } 682 683 /* Calculate current success ratio, avoid divide-by-0! */ 684 if (window->counter > 0) 685 window->success_ratio = 128 * (100 * window->success_counter) 686 / window->counter; 687 else 688 window->success_ratio = IWL_INVALID_VALUE; 689 690 fail_count = window->counter - window->success_counter; 691 692 /* Calculate average throughput, if we have enough history. */ 693 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 694 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 695 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 696 else 697 window->average_tpt = IWL_INVALID_VALUE; 698 699 return 0; 700 } 701 702 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 703 struct iwl_lq_sta *lq_sta, 704 struct iwl_scale_tbl_info *tbl, 705 int scale_index, int attempts, int successes, 706 u8 reduced_txp) 707 { 708 struct iwl_rate_scale_data *window = NULL; 709 710 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 711 return -EINVAL; 712 713 window = &tbl->tpc_win[reduced_txp]; 714 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 715 window); 716 } 717 718 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 719 struct iwl_mvm_sta *mvmsta, 720 u8 tid, int successes) 721 { 722 struct iwl_mvm_tid_data *tid_data; 723 724 if (tid >= IWL_MAX_TID_COUNT) 725 return; 726 727 tid_data = &mvmsta->tid_data[tid]; 728 729 /* 730 * Measure if there're enough successful transmits per second. 731 * These statistics are used only to decide if we can start a 732 * BA session, so it should be updated only when A-MPDU is 733 * off. 734 */ 735 if (tid_data->state != IWL_AGG_OFF) 736 return; 737 738 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 739 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 740 tid_data->tx_count_last = tid_data->tx_count; 741 tid_data->tx_count = 0; 742 tid_data->tpt_meas_start = jiffies; 743 } else { 744 tid_data->tx_count += successes; 745 } 746 } 747 748 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 749 struct iwl_mvm_sta *mvmsta, u8 tid, 750 struct iwl_scale_tbl_info *tbl, 751 int scale_index, int attempts, int successes) 752 { 753 struct iwl_rate_scale_data *window = NULL; 754 755 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 756 return -EINVAL; 757 758 if (tbl->column != RS_COLUMN_INVALID) { 759 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 760 761 pers->tx_stats[tbl->column][scale_index].total += attempts; 762 pers->tx_stats[tbl->column][scale_index].success += successes; 763 } 764 765 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 766 767 /* Select window for current tx bit rate */ 768 window = &(tbl->win[scale_index]); 769 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 770 window); 771 } 772 773 /* Convert rs_rate object into ucode rate bitmask */ 774 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 775 struct rs_rate *rate) 776 { 777 u32 ucode_rate = 0; 778 int index = rate->index; 779 780 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 781 RATE_MCS_ANT_AB_MSK); 782 783 if (is_legacy(rate)) { 784 ucode_rate |= iwl_rates[index].plcp; 785 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 786 ucode_rate |= RATE_MCS_CCK_MSK_V1; 787 return ucode_rate; 788 } 789 790 /* set RTS protection for all non legacy rates 791 * This helps with congested environments reducing the conflict cost to 792 * RTS retries only, instead of the entire BA packet. 793 */ 794 ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK; 795 796 if (is_ht(rate)) { 797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 799 index = IWL_LAST_HT_RATE; 800 } 801 ucode_rate |= RATE_MCS_HT_MSK_V1; 802 803 if (is_ht_siso(rate)) 804 ucode_rate |= iwl_rates[index].plcp_ht_siso; 805 else if (is_ht_mimo2(rate)) 806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 807 else 808 WARN_ON_ONCE(1); 809 } else if (is_vht(rate)) { 810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 812 index = IWL_LAST_VHT_RATE; 813 } 814 ucode_rate |= RATE_MCS_VHT_MSK_V1; 815 if (is_vht_siso(rate)) 816 ucode_rate |= iwl_rates[index].plcp_vht_siso; 817 else if (is_vht_mimo2(rate)) 818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 819 else 820 WARN_ON_ONCE(1); 821 822 } else { 823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 824 } 825 826 if (is_siso(rate) && rate->stbc) { 827 /* To enable STBC we need to set both a flag and ANT_AB */ 828 ucode_rate |= RATE_MCS_ANT_AB_MSK; 829 ucode_rate |= RATE_MCS_STBC_MSK; 830 } 831 832 ucode_rate |= rate->bw; 833 if (rate->sgi) 834 ucode_rate |= RATE_MCS_SGI_MSK_V1; 835 if (rate->ldpc) 836 ucode_rate |= RATE_MCS_LDPC_MSK_V1; 837 838 return ucode_rate; 839 } 840 841 /* Convert a ucode rate into an rs_rate object */ 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 843 enum nl80211_band band, 844 struct rs_rate *rate) 845 { 846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK; 847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 848 u8 nss; 849 850 memset(rate, 0, sizeof(*rate)); 851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 852 853 if (rate->index == IWL_RATE_INVALID) 854 return -EINVAL; 855 856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 857 858 /* Legacy */ 859 if (!(ucode_rate & RATE_MCS_HT_MSK_V1) && 860 !(ucode_rate & RATE_MCS_VHT_MSK_V1) && 861 !(ucode_rate & RATE_MCS_HE_MSK_V1)) { 862 if (num_of_ant == 1) { 863 if (band == NL80211_BAND_5GHZ) 864 rate->type = LQ_LEGACY_A; 865 else 866 rate->type = LQ_LEGACY_G; 867 } 868 869 return 0; 870 } 871 872 /* HT, VHT or HE */ 873 if (ucode_rate & RATE_MCS_SGI_MSK_V1) 874 rate->sgi = true; 875 if (ucode_rate & RATE_MCS_LDPC_MSK_V1) 876 rate->ldpc = true; 877 if (ucode_rate & RATE_MCS_STBC_MSK) 878 rate->stbc = true; 879 if (ucode_rate & RATE_MCS_BF_MSK) 880 rate->bfer = true; 881 882 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1; 883 884 if (ucode_rate & RATE_MCS_HT_MSK_V1) { 885 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >> 886 RATE_HT_MCS_NSS_POS_V1) + 1; 887 888 if (nss == 1) { 889 rate->type = LQ_HT_SISO; 890 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 891 "stbc %d bfer %d", 892 rate->stbc, rate->bfer); 893 } else if (nss == 2) { 894 rate->type = LQ_HT_MIMO2; 895 WARN_ON_ONCE(num_of_ant != 2); 896 } else { 897 WARN_ON_ONCE(1); 898 } 899 } else if (ucode_rate & RATE_MCS_VHT_MSK_V1) { 900 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 901 RATE_VHT_MCS_NSS_POS) + 1; 902 903 if (nss == 1) { 904 rate->type = LQ_VHT_SISO; 905 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 906 "stbc %d bfer %d", 907 rate->stbc, rate->bfer); 908 } else if (nss == 2) { 909 rate->type = LQ_VHT_MIMO2; 910 WARN_ON_ONCE(num_of_ant != 2); 911 } else { 912 WARN_ON_ONCE(1); 913 } 914 } else if (ucode_rate & RATE_MCS_HE_MSK_V1) { 915 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 916 RATE_VHT_MCS_NSS_POS) + 1; 917 918 if (nss == 1) { 919 rate->type = LQ_HE_SISO; 920 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 921 "stbc %d bfer %d", rate->stbc, rate->bfer); 922 } else if (nss == 2) { 923 rate->type = LQ_HE_MIMO2; 924 WARN_ON_ONCE(num_of_ant != 2); 925 } else { 926 WARN_ON_ONCE(1); 927 } 928 } 929 930 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 931 !is_he(rate) && !is_vht(rate)); 932 933 return 0; 934 } 935 936 /* switch to another antenna/antennas and return 1 */ 937 /* if no other valid antenna found, return 0 */ 938 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 939 { 940 u8 new_ant_type; 941 942 if (!rs_is_valid_ant(valid_ant, rate->ant)) 943 return 0; 944 945 new_ant_type = ant_toggle_lookup[rate->ant]; 946 947 while ((new_ant_type != rate->ant) && 948 !rs_is_valid_ant(valid_ant, new_ant_type)) 949 new_ant_type = ant_toggle_lookup[new_ant_type]; 950 951 if (new_ant_type == rate->ant) 952 return 0; 953 954 rate->ant = new_ant_type; 955 956 return 1; 957 } 958 959 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 960 struct rs_rate *rate) 961 { 962 if (is_legacy(rate)) 963 return lq_sta->active_legacy_rate; 964 else if (is_siso(rate)) 965 return lq_sta->active_siso_rate; 966 else if (is_mimo2(rate)) 967 return lq_sta->active_mimo2_rate; 968 969 WARN_ON_ONCE(1); 970 return 0; 971 } 972 973 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 974 int rate_type) 975 { 976 u8 high = IWL_RATE_INVALID; 977 u8 low = IWL_RATE_INVALID; 978 979 /* 802.11A or ht walks to the next literal adjacent rate in 980 * the rate table */ 981 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 982 int i; 983 u32 mask; 984 985 /* Find the previous rate that is in the rate mask */ 986 i = index - 1; 987 if (i >= 0) 988 mask = BIT(i); 989 for (; i >= 0; i--, mask >>= 1) { 990 if (rate_mask & mask) { 991 low = i; 992 break; 993 } 994 } 995 996 /* Find the next rate that is in the rate mask */ 997 i = index + 1; 998 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 999 if (rate_mask & mask) { 1000 high = i; 1001 break; 1002 } 1003 } 1004 1005 return (high << 8) | low; 1006 } 1007 1008 low = index; 1009 while (low != IWL_RATE_INVALID) { 1010 low = iwl_rates[low].prev_rs; 1011 if (low == IWL_RATE_INVALID) 1012 break; 1013 if (rate_mask & (1 << low)) 1014 break; 1015 } 1016 1017 high = index; 1018 while (high != IWL_RATE_INVALID) { 1019 high = iwl_rates[high].next_rs; 1020 if (high == IWL_RATE_INVALID) 1021 break; 1022 if (rate_mask & (1 << high)) 1023 break; 1024 } 1025 1026 return (high << 8) | low; 1027 } 1028 1029 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1030 struct rs_rate *rate) 1031 { 1032 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1033 } 1034 1035 /* Get the next supported lower rate in the current column. 1036 * Return true if bottom rate in the current column was reached 1037 */ 1038 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1039 struct rs_rate *rate) 1040 { 1041 u8 low; 1042 u16 high_low; 1043 u16 rate_mask; 1044 struct iwl_mvm *mvm = lq_sta->pers.drv; 1045 1046 rate_mask = rs_get_supported_rates(lq_sta, rate); 1047 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1048 rate->type); 1049 low = high_low & 0xff; 1050 1051 /* Bottom rate of column reached */ 1052 if (low == IWL_RATE_INVALID) 1053 return true; 1054 1055 rate->index = low; 1056 return false; 1057 } 1058 1059 /* Get the next rate to use following a column downgrade */ 1060 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1061 struct rs_rate *rate) 1062 { 1063 struct iwl_mvm *mvm = lq_sta->pers.drv; 1064 1065 if (is_legacy(rate)) { 1066 /* No column to downgrade from Legacy */ 1067 return; 1068 } else if (is_siso(rate)) { 1069 /* Downgrade to Legacy if we were in SISO */ 1070 if (lq_sta->band == NL80211_BAND_5GHZ) 1071 rate->type = LQ_LEGACY_A; 1072 else 1073 rate->type = LQ_LEGACY_G; 1074 1075 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1076 1077 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1078 rate->index > IWL_RATE_MCS_9_INDEX); 1079 1080 rate->index = rs_ht_to_legacy[rate->index]; 1081 rate->ldpc = false; 1082 } else { 1083 /* Downgrade to SISO with same MCS if in MIMO */ 1084 rate->type = is_vht_mimo2(rate) ? 1085 LQ_VHT_SISO : LQ_HT_SISO; 1086 } 1087 1088 if (num_of_ant(rate->ant) > 1) 1089 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1090 1091 /* Relevant in both switching to SISO or Legacy */ 1092 rate->sgi = false; 1093 1094 if (!rs_rate_supported(lq_sta, rate)) 1095 rs_get_lower_rate_in_column(lq_sta, rate); 1096 } 1097 1098 /* Check if both rates share the same column */ 1099 static inline bool rs_rate_column_match(struct rs_rate *a, 1100 struct rs_rate *b) 1101 { 1102 bool ant_match; 1103 1104 if (a->stbc || a->bfer) 1105 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1106 else 1107 ant_match = (a->ant == b->ant); 1108 1109 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1110 && ant_match; 1111 } 1112 1113 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1114 { 1115 if (is_legacy(rate)) { 1116 if (rate->ant == ANT_A) 1117 return RS_COLUMN_LEGACY_ANT_A; 1118 1119 if (rate->ant == ANT_B) 1120 return RS_COLUMN_LEGACY_ANT_B; 1121 1122 goto err; 1123 } 1124 1125 if (is_siso(rate)) { 1126 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1127 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1128 RS_COLUMN_SISO_ANT_A; 1129 1130 if (rate->ant == ANT_B) 1131 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1132 RS_COLUMN_SISO_ANT_B; 1133 1134 goto err; 1135 } 1136 1137 if (is_mimo(rate)) 1138 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1139 1140 err: 1141 return RS_COLUMN_INVALID; 1142 } 1143 1144 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1145 { 1146 u8 tid = IWL_MAX_TID_COUNT; 1147 1148 if (ieee80211_is_data_qos(hdr->frame_control)) { 1149 u8 *qc = ieee80211_get_qos_ctl(hdr); 1150 tid = qc[0] & 0xf; 1151 } 1152 1153 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1154 tid = IWL_MAX_TID_COUNT; 1155 1156 return tid; 1157 } 1158 1159 /* 1160 * mac80211 sends us Tx status 1161 */ 1162 static void rs_drv_mac80211_tx_status(void *mvm_r, 1163 struct ieee80211_supported_band *sband, 1164 struct ieee80211_sta *sta, void *priv_sta, 1165 struct sk_buff *skb) 1166 { 1167 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1168 struct iwl_op_mode *op_mode = mvm_r; 1169 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1171 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1172 1173 if (!mvmsta->vif) 1174 return; 1175 1176 if (!ieee80211_is_data(hdr->frame_control) || 1177 info->flags & IEEE80211_TX_CTL_NO_ACK) 1178 return; 1179 1180 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1181 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1182 } 1183 1184 /* 1185 * Begin a period of staying with a selected modulation mode. 1186 * Set "stay_in_tbl" flag to prevent any mode switches. 1187 * Set frame tx success limits according to legacy vs. high-throughput, 1188 * and reset overall (spanning all rates) tx success history statistics. 1189 * These control how long we stay using same modulation mode before 1190 * searching for a new mode. 1191 */ 1192 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1193 struct iwl_lq_sta *lq_sta) 1194 { 1195 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1196 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1197 if (is_legacy) { 1198 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1199 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1200 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1201 } else { 1202 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1203 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1204 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1205 } 1206 lq_sta->table_count = 0; 1207 lq_sta->total_failed = 0; 1208 lq_sta->total_success = 0; 1209 lq_sta->flush_timer = jiffies; 1210 lq_sta->visited_columns = 0; 1211 } 1212 1213 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1214 { 1215 if (rate_mask) 1216 return find_last_bit(&rate_mask, BITS_PER_LONG); 1217 return IWL_RATE_INVALID; 1218 } 1219 1220 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1221 const struct rs_tx_column *column) 1222 { 1223 switch (column->mode) { 1224 case RS_LEGACY: 1225 return lq_sta->max_legacy_rate_idx; 1226 case RS_SISO: 1227 return lq_sta->max_siso_rate_idx; 1228 case RS_MIMO2: 1229 return lq_sta->max_mimo2_rate_idx; 1230 default: 1231 WARN_ON_ONCE(1); 1232 } 1233 1234 return lq_sta->max_legacy_rate_idx; 1235 } 1236 1237 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1238 const struct rs_tx_column *column, 1239 u32 bw) 1240 { 1241 /* Used to choose among HT tables */ 1242 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1243 1244 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1245 column->mode != RS_SISO && 1246 column->mode != RS_MIMO2)) 1247 return expected_tpt_legacy; 1248 1249 /* Legacy rates have only one table */ 1250 if (column->mode == RS_LEGACY) 1251 return expected_tpt_legacy; 1252 1253 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1254 /* Choose among many HT tables depending on number of streams 1255 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1256 * status */ 1257 if (column->mode == RS_SISO) { 1258 switch (bw) { 1259 case RATE_MCS_CHAN_WIDTH_20: 1260 ht_tbl_pointer = expected_tpt_siso_20MHz; 1261 break; 1262 case RATE_MCS_CHAN_WIDTH_40: 1263 ht_tbl_pointer = expected_tpt_siso_40MHz; 1264 break; 1265 case RATE_MCS_CHAN_WIDTH_80: 1266 ht_tbl_pointer = expected_tpt_siso_80MHz; 1267 break; 1268 case RATE_MCS_CHAN_WIDTH_160: 1269 ht_tbl_pointer = expected_tpt_siso_160MHz; 1270 break; 1271 default: 1272 WARN_ON_ONCE(1); 1273 } 1274 } else if (column->mode == RS_MIMO2) { 1275 switch (bw) { 1276 case RATE_MCS_CHAN_WIDTH_20: 1277 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1278 break; 1279 case RATE_MCS_CHAN_WIDTH_40: 1280 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1281 break; 1282 case RATE_MCS_CHAN_WIDTH_80: 1283 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1284 break; 1285 case RATE_MCS_CHAN_WIDTH_160: 1286 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1287 break; 1288 default: 1289 WARN_ON_ONCE(1); 1290 } 1291 } else { 1292 WARN_ON_ONCE(1); 1293 } 1294 1295 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1296 return ht_tbl_pointer[0]; 1297 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1298 return ht_tbl_pointer[1]; 1299 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1300 return ht_tbl_pointer[2]; 1301 else /* AGG+SGI */ 1302 return ht_tbl_pointer[3]; 1303 } 1304 1305 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1306 struct iwl_scale_tbl_info *tbl) 1307 { 1308 struct rs_rate *rate = &tbl->rate; 1309 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1310 1311 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1312 } 1313 1314 /* rs uses two tables, one is active and the second is for searching better 1315 * configuration. This function, according to the index of the currently 1316 * active table returns the search table, which is located at the 1317 * index complementary to 1 according to the active table (active = 1, 1318 * search = 0 or active = 0, search = 1). 1319 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds. 1320 */ 1321 static inline u8 rs_search_tbl(u8 active_tbl) 1322 { 1323 return (active_tbl ^ 1) & 1; 1324 } 1325 1326 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1327 struct iwl_lq_sta *lq_sta, 1328 struct iwl_scale_tbl_info *tbl, /* "search" */ 1329 unsigned long rate_mask, s8 index) 1330 { 1331 struct iwl_scale_tbl_info *active_tbl = 1332 &(lq_sta->lq_info[lq_sta->active_tbl]); 1333 s32 success_ratio = active_tbl->win[index].success_ratio; 1334 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1335 const u16 *tpt_tbl = tbl->expected_tpt; 1336 u16 high_low; 1337 u32 target_tpt; 1338 int rate_idx; 1339 1340 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1341 target_tpt = 100 * expected_current_tpt; 1342 IWL_DEBUG_RATE(mvm, 1343 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1344 success_ratio, target_tpt); 1345 } else { 1346 target_tpt = lq_sta->last_tpt; 1347 IWL_DEBUG_RATE(mvm, 1348 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1349 success_ratio, target_tpt); 1350 } 1351 1352 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1353 1354 while (rate_idx != IWL_RATE_INVALID) { 1355 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1356 break; 1357 1358 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1359 tbl->rate.type); 1360 1361 rate_idx = (high_low >> 8) & 0xff; 1362 } 1363 1364 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1365 rate_idx, target_tpt, 1366 rate_idx != IWL_RATE_INVALID ? 1367 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1368 1369 return rate_idx; 1370 } 1371 1372 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1373 { 1374 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1375 struct ieee80211_vht_cap vht_cap = { 1376 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1377 .supp_mcs = sta_vht_cap->vht_mcs, 1378 }; 1379 1380 switch (sta->bandwidth) { 1381 case IEEE80211_STA_RX_BW_160: 1382 /* 1383 * Don't use 160 MHz if VHT extended NSS support 1384 * says we cannot use 2 streams, we don't want to 1385 * deal with this. 1386 * We only check MCS 0 - they will support that if 1387 * we got here at all and we don't care which MCS, 1388 * we want to determine a more global state. 1389 */ 1390 if (ieee80211_get_vht_max_nss(&vht_cap, 1391 IEEE80211_VHT_CHANWIDTH_160MHZ, 1392 0, true, 1393 sta->rx_nss) < sta->rx_nss) 1394 return RATE_MCS_CHAN_WIDTH_80; 1395 return RATE_MCS_CHAN_WIDTH_160; 1396 case IEEE80211_STA_RX_BW_80: 1397 return RATE_MCS_CHAN_WIDTH_80; 1398 case IEEE80211_STA_RX_BW_40: 1399 return RATE_MCS_CHAN_WIDTH_40; 1400 case IEEE80211_STA_RX_BW_20: 1401 default: 1402 return RATE_MCS_CHAN_WIDTH_20; 1403 } 1404 } 1405 1406 /* 1407 * Check whether we should continue using same modulation mode, or 1408 * begin search for a new mode, based on: 1409 * 1) # tx successes or failures while using this mode 1410 * 2) # times calling this function 1411 * 3) elapsed time in this mode (not used, for now) 1412 */ 1413 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1414 { 1415 struct iwl_scale_tbl_info *tbl; 1416 int active_tbl; 1417 int flush_interval_passed = 0; 1418 struct iwl_mvm *mvm; 1419 1420 mvm = lq_sta->pers.drv; 1421 active_tbl = lq_sta->active_tbl; 1422 1423 tbl = &(lq_sta->lq_info[active_tbl]); 1424 1425 /* If we've been disallowing search, see if we should now allow it */ 1426 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1427 /* Elapsed time using current modulation mode */ 1428 if (lq_sta->flush_timer) 1429 flush_interval_passed = 1430 time_after(jiffies, 1431 (unsigned long)(lq_sta->flush_timer + 1432 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1433 1434 /* 1435 * Check if we should allow search for new modulation mode. 1436 * If many frames have failed or succeeded, or we've used 1437 * this same modulation for a long time, allow search, and 1438 * reset history stats that keep track of whether we should 1439 * allow a new search. Also (below) reset all bitmaps and 1440 * stats in active history. 1441 */ 1442 if (force_search || 1443 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1444 (lq_sta->total_success > lq_sta->max_success_limit) || 1445 ((!lq_sta->search_better_tbl) && 1446 (lq_sta->flush_timer) && (flush_interval_passed))) { 1447 IWL_DEBUG_RATE(mvm, 1448 "LQ: stay is expired %d %d %d\n", 1449 lq_sta->total_failed, 1450 lq_sta->total_success, 1451 flush_interval_passed); 1452 1453 /* Allow search for new mode */ 1454 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1455 IWL_DEBUG_RATE(mvm, 1456 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1457 lq_sta->total_failed = 0; 1458 lq_sta->total_success = 0; 1459 lq_sta->flush_timer = 0; 1460 /* mark the current column as visited */ 1461 lq_sta->visited_columns = BIT(tbl->column); 1462 /* 1463 * Else if we've used this modulation mode enough repetitions 1464 * (regardless of elapsed time or success/failure), reset 1465 * history bitmaps and rate-specific stats for all rates in 1466 * active table. 1467 */ 1468 } else { 1469 lq_sta->table_count++; 1470 if (lq_sta->table_count >= 1471 lq_sta->table_count_limit) { 1472 lq_sta->table_count = 0; 1473 1474 IWL_DEBUG_RATE(mvm, 1475 "LQ: stay in table clear win\n"); 1476 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1477 } 1478 } 1479 1480 /* If transitioning to allow "search", reset all history 1481 * bitmaps and stats in active table (this will become the new 1482 * "search" table). */ 1483 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1484 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1485 } 1486 } 1487 } 1488 1489 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1490 struct iwl_scale_tbl_info *tbl, 1491 enum rs_action scale_action) 1492 { 1493 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1494 int i; 1495 1496 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta); 1497 1498 /* 1499 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1500 * or 0, since there is no per-TID alg. 1501 */ 1502 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1503 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1504 scale_action == RS_ACTION_DOWNSCALE) 1505 mvmsta->amsdu_enabled = 0; 1506 else 1507 mvmsta->amsdu_enabled = 0xFFFF; 1508 1509 if (mvmsta->vif->bss_conf.he_support && 1510 !iwlwifi_mod_params.disable_11ax) 1511 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1512 else 1513 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1514 1515 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1516 1517 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1518 if (mvmsta->amsdu_enabled) 1519 sta->max_tid_amsdu_len[i] = 1520 iwl_mvm_max_amsdu_size(mvm, sta, i); 1521 else 1522 /* 1523 * Not so elegant, but this will effectively 1524 * prevent AMSDU on this TID 1525 */ 1526 sta->max_tid_amsdu_len[i] = 1; 1527 } 1528 } 1529 1530 /* 1531 * setup rate table in uCode 1532 */ 1533 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1534 struct ieee80211_sta *sta, 1535 struct iwl_lq_sta *lq_sta, 1536 struct iwl_scale_tbl_info *tbl) 1537 { 1538 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1539 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 1540 } 1541 1542 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1543 struct ieee80211_sta *sta, 1544 struct iwl_lq_sta *lq_sta, 1545 struct iwl_scale_tbl_info *tbl, 1546 enum rs_action scale_action) 1547 { 1548 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1549 return false; 1550 1551 if (!is_vht_siso(&tbl->rate)) 1552 return false; 1553 1554 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1555 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1556 (scale_action == RS_ACTION_DOWNSCALE)) { 1557 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1558 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1559 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1560 goto tweaked; 1561 } 1562 1563 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1564 * sustainable, i.e. we're past the test window. We can't go back 1565 * if MCS5 is just tested as this will happen always after switching 1566 * to 20Mhz MCS4 because the rate stats are cleared. 1567 */ 1568 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1569 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1570 (scale_action == RS_ACTION_STAY)) || 1571 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1572 (scale_action == RS_ACTION_UPSCALE)))) { 1573 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1574 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1575 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1576 goto tweaked; 1577 } 1578 1579 return false; 1580 1581 tweaked: 1582 rs_set_expected_tpt_table(lq_sta, tbl); 1583 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1584 return true; 1585 } 1586 1587 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1588 struct iwl_lq_sta *lq_sta, 1589 struct ieee80211_sta *sta, 1590 struct iwl_scale_tbl_info *tbl) 1591 { 1592 int i, j, max_rate; 1593 enum rs_column next_col_id; 1594 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1595 const struct rs_tx_column *next_col; 1596 allow_column_func_t allow_func; 1597 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1598 const u16 *expected_tpt_tbl; 1599 u16 tpt, max_expected_tpt; 1600 1601 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1602 next_col_id = curr_col->next_columns[i]; 1603 1604 if (next_col_id == RS_COLUMN_INVALID) 1605 continue; 1606 1607 if (lq_sta->visited_columns & BIT(next_col_id)) { 1608 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1609 next_col_id); 1610 continue; 1611 } 1612 1613 next_col = &rs_tx_columns[next_col_id]; 1614 1615 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1616 IWL_DEBUG_RATE(mvm, 1617 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1618 next_col_id, valid_ants, next_col->ant); 1619 continue; 1620 } 1621 1622 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1623 allow_func = next_col->checks[j]; 1624 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1625 next_col)) 1626 break; 1627 } 1628 1629 if (j != MAX_COLUMN_CHECKS) { 1630 IWL_DEBUG_RATE(mvm, 1631 "Skip column %d: not allowed (check %d failed)\n", 1632 next_col_id, j); 1633 1634 continue; 1635 } 1636 1637 tpt = lq_sta->last_tpt / 100; 1638 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1639 rs_bw_from_sta_bw(sta)); 1640 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1641 continue; 1642 1643 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1644 if (max_rate == IWL_RATE_INVALID) { 1645 IWL_DEBUG_RATE(mvm, 1646 "Skip column %d: no rate is allowed in this column\n", 1647 next_col_id); 1648 continue; 1649 } 1650 1651 max_expected_tpt = expected_tpt_tbl[max_rate]; 1652 if (tpt >= max_expected_tpt) { 1653 IWL_DEBUG_RATE(mvm, 1654 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1655 next_col_id, max_expected_tpt, tpt); 1656 continue; 1657 } 1658 1659 IWL_DEBUG_RATE(mvm, 1660 "Found potential column %d. Max expected %d current %d\n", 1661 next_col_id, max_expected_tpt, tpt); 1662 break; 1663 } 1664 1665 if (i == MAX_NEXT_COLUMNS) 1666 return RS_COLUMN_INVALID; 1667 1668 return next_col_id; 1669 } 1670 1671 static int rs_switch_to_column(struct iwl_mvm *mvm, 1672 struct iwl_lq_sta *lq_sta, 1673 struct ieee80211_sta *sta, 1674 enum rs_column col_id) 1675 { 1676 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 1677 struct iwl_scale_tbl_info *search_tbl = 1678 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 1679 struct rs_rate *rate = &search_tbl->rate; 1680 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1681 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1682 unsigned long rate_mask = 0; 1683 u32 rate_idx = 0; 1684 1685 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1686 1687 rate->sgi = column->sgi; 1688 rate->ant = column->ant; 1689 1690 if (column->mode == RS_LEGACY) { 1691 if (lq_sta->band == NL80211_BAND_5GHZ) 1692 rate->type = LQ_LEGACY_A; 1693 else 1694 rate->type = LQ_LEGACY_G; 1695 1696 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1697 rate->ldpc = false; 1698 rate_mask = lq_sta->active_legacy_rate; 1699 } else if (column->mode == RS_SISO) { 1700 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1701 rate_mask = lq_sta->active_siso_rate; 1702 } else if (column->mode == RS_MIMO2) { 1703 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1704 rate_mask = lq_sta->active_mimo2_rate; 1705 } else { 1706 WARN_ONCE(1, "Bad column mode"); 1707 } 1708 1709 if (column->mode != RS_LEGACY) { 1710 rate->bw = rs_bw_from_sta_bw(sta); 1711 rate->ldpc = lq_sta->ldpc; 1712 } 1713 1714 search_tbl->column = col_id; 1715 rs_set_expected_tpt_table(lq_sta, search_tbl); 1716 1717 lq_sta->visited_columns |= BIT(col_id); 1718 1719 /* Get the best matching rate if we're changing modes. e.g. 1720 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1721 */ 1722 if (curr_column->mode != column->mode) { 1723 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1724 rate_mask, rate->index); 1725 1726 if ((rate_idx == IWL_RATE_INVALID) || 1727 !(BIT(rate_idx) & rate_mask)) { 1728 IWL_DEBUG_RATE(mvm, 1729 "can not switch with index %d" 1730 " rate mask %lx\n", 1731 rate_idx, rate_mask); 1732 1733 goto err; 1734 } 1735 1736 rate->index = rate_idx; 1737 } 1738 1739 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1740 col_id, rate->index); 1741 1742 return 0; 1743 1744 err: 1745 rate->type = LQ_NONE; 1746 return -1; 1747 } 1748 1749 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1750 struct iwl_scale_tbl_info *tbl, 1751 s32 sr, int low, int high, 1752 int current_tpt, 1753 int low_tpt, int high_tpt) 1754 { 1755 enum rs_action action = RS_ACTION_STAY; 1756 1757 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1758 (current_tpt == 0)) { 1759 IWL_DEBUG_RATE(mvm, 1760 "Decrease rate because of low SR\n"); 1761 return RS_ACTION_DOWNSCALE; 1762 } 1763 1764 if ((low_tpt == IWL_INVALID_VALUE) && 1765 (high_tpt == IWL_INVALID_VALUE) && 1766 (high != IWL_RATE_INVALID)) { 1767 IWL_DEBUG_RATE(mvm, 1768 "No data about high/low rates. Increase rate\n"); 1769 return RS_ACTION_UPSCALE; 1770 } 1771 1772 if ((high_tpt == IWL_INVALID_VALUE) && 1773 (high != IWL_RATE_INVALID) && 1774 (low_tpt != IWL_INVALID_VALUE) && 1775 (low_tpt < current_tpt)) { 1776 IWL_DEBUG_RATE(mvm, 1777 "No data about high rate and low rate is worse. Increase rate\n"); 1778 return RS_ACTION_UPSCALE; 1779 } 1780 1781 if ((high_tpt != IWL_INVALID_VALUE) && 1782 (high_tpt > current_tpt)) { 1783 IWL_DEBUG_RATE(mvm, 1784 "Higher rate is better. Increate rate\n"); 1785 return RS_ACTION_UPSCALE; 1786 } 1787 1788 if ((low_tpt != IWL_INVALID_VALUE) && 1789 (high_tpt != IWL_INVALID_VALUE) && 1790 (low_tpt < current_tpt) && 1791 (high_tpt < current_tpt)) { 1792 IWL_DEBUG_RATE(mvm, 1793 "Both high and low are worse. Maintain rate\n"); 1794 return RS_ACTION_STAY; 1795 } 1796 1797 if ((low_tpt != IWL_INVALID_VALUE) && 1798 (low_tpt > current_tpt)) { 1799 IWL_DEBUG_RATE(mvm, 1800 "Lower rate is better\n"); 1801 action = RS_ACTION_DOWNSCALE; 1802 goto out; 1803 } 1804 1805 if ((low_tpt == IWL_INVALID_VALUE) && 1806 (low != IWL_RATE_INVALID)) { 1807 IWL_DEBUG_RATE(mvm, 1808 "No data about lower rate\n"); 1809 action = RS_ACTION_DOWNSCALE; 1810 goto out; 1811 } 1812 1813 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1814 1815 out: 1816 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1817 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1818 IWL_DEBUG_RATE(mvm, 1819 "SR is above NO DECREASE. Avoid downscale\n"); 1820 action = RS_ACTION_STAY; 1821 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1822 IWL_DEBUG_RATE(mvm, 1823 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1824 action = RS_ACTION_STAY; 1825 } else { 1826 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1827 } 1828 } 1829 1830 return action; 1831 } 1832 1833 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1834 struct iwl_lq_sta *lq_sta) 1835 { 1836 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1837 * supports STBC of at least 1*SS 1838 */ 1839 if (!lq_sta->stbc_capable) 1840 return false; 1841 1842 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1843 return false; 1844 1845 return true; 1846 } 1847 1848 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1849 int *weaker, int *stronger) 1850 { 1851 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1852 if (*weaker > TPC_MAX_REDUCTION) 1853 *weaker = TPC_INVALID; 1854 1855 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1856 if (*stronger < 0) 1857 *stronger = TPC_INVALID; 1858 } 1859 1860 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1861 struct rs_rate *rate, enum nl80211_band band) 1862 { 1863 int index = rate->index; 1864 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1865 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1866 !vif->bss_conf.ps); 1867 1868 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1869 cam, sta_ps_disabled); 1870 /* 1871 * allow tpc only if power management is enabled, or bt coex 1872 * activity grade allows it and we are on 2.4Ghz. 1873 */ 1874 if ((cam || sta_ps_disabled) && 1875 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1876 return false; 1877 1878 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1879 if (is_legacy(rate)) 1880 return index == IWL_RATE_54M_INDEX; 1881 if (is_ht(rate)) 1882 return index == IWL_RATE_MCS_7_INDEX; 1883 if (is_vht(rate)) 1884 return index == IWL_RATE_MCS_9_INDEX; 1885 1886 WARN_ON_ONCE(1); 1887 return false; 1888 } 1889 1890 enum tpc_action { 1891 TPC_ACTION_STAY, 1892 TPC_ACTION_DECREASE, 1893 TPC_ACTION_INCREASE, 1894 TPC_ACTION_NO_RESTIRCTION, 1895 }; 1896 1897 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1898 s32 sr, int weak, int strong, 1899 int current_tpt, 1900 int weak_tpt, int strong_tpt) 1901 { 1902 /* stay until we have valid tpt */ 1903 if (current_tpt == IWL_INVALID_VALUE) { 1904 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1905 return TPC_ACTION_STAY; 1906 } 1907 1908 /* Too many failures, increase txp */ 1909 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1910 current_tpt == 0) { 1911 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1912 return TPC_ACTION_NO_RESTIRCTION; 1913 } 1914 1915 /* try decreasing first if applicable */ 1916 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1917 weak != TPC_INVALID) { 1918 if (weak_tpt == IWL_INVALID_VALUE && 1919 (strong_tpt == IWL_INVALID_VALUE || 1920 current_tpt >= strong_tpt)) { 1921 IWL_DEBUG_RATE(mvm, 1922 "no weak txp measurement. decrease txp\n"); 1923 return TPC_ACTION_DECREASE; 1924 } 1925 1926 if (weak_tpt > current_tpt) { 1927 IWL_DEBUG_RATE(mvm, 1928 "lower txp has better tpt. decrease txp\n"); 1929 return TPC_ACTION_DECREASE; 1930 } 1931 } 1932 1933 /* next, increase if needed */ 1934 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1935 strong != TPC_INVALID) { 1936 if (weak_tpt == IWL_INVALID_VALUE && 1937 strong_tpt != IWL_INVALID_VALUE && 1938 current_tpt < strong_tpt) { 1939 IWL_DEBUG_RATE(mvm, 1940 "higher txp has better tpt. increase txp\n"); 1941 return TPC_ACTION_INCREASE; 1942 } 1943 1944 if (weak_tpt < current_tpt && 1945 (strong_tpt == IWL_INVALID_VALUE || 1946 strong_tpt > current_tpt)) { 1947 IWL_DEBUG_RATE(mvm, 1948 "lower txp has worse tpt. increase txp\n"); 1949 return TPC_ACTION_INCREASE; 1950 } 1951 } 1952 1953 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 1954 return TPC_ACTION_STAY; 1955 } 1956 1957 static bool rs_tpc_perform(struct iwl_mvm *mvm, 1958 struct ieee80211_sta *sta, 1959 struct iwl_lq_sta *lq_sta, 1960 struct iwl_scale_tbl_info *tbl) 1961 { 1962 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 1963 struct ieee80211_vif *vif = mvm_sta->vif; 1964 struct ieee80211_chanctx_conf *chanctx_conf; 1965 enum nl80211_band band; 1966 struct iwl_rate_scale_data *window; 1967 struct rs_rate *rate = &tbl->rate; 1968 enum tpc_action action; 1969 s32 sr; 1970 u8 cur = lq_sta->lq.reduced_tpc; 1971 int current_tpt; 1972 int weak, strong; 1973 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 1974 1975 #ifdef CONFIG_MAC80211_DEBUGFS 1976 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 1977 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 1978 lq_sta->pers.dbg_fixed_txp_reduction); 1979 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 1980 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 1981 } 1982 #endif 1983 1984 rcu_read_lock(); 1985 chanctx_conf = rcu_dereference(vif->chanctx_conf); 1986 if (WARN_ON(!chanctx_conf)) 1987 band = NUM_NL80211_BANDS; 1988 else 1989 band = chanctx_conf->def.chan->band; 1990 rcu_read_unlock(); 1991 1992 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 1993 IWL_DEBUG_RATE(mvm, 1994 "tpc is not allowed. remove txp restrictions\n"); 1995 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 1996 return cur != TPC_NO_REDUCTION; 1997 } 1998 1999 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2000 2001 /* Collect measured throughputs for current and adjacent rates */ 2002 window = tbl->tpc_win; 2003 sr = window[cur].success_ratio; 2004 current_tpt = window[cur].average_tpt; 2005 if (weak != TPC_INVALID) 2006 weak_tpt = window[weak].average_tpt; 2007 if (strong != TPC_INVALID) 2008 strong_tpt = window[strong].average_tpt; 2009 2010 IWL_DEBUG_RATE(mvm, 2011 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2012 cur, current_tpt, sr, weak, strong, 2013 weak_tpt, strong_tpt); 2014 2015 action = rs_get_tpc_action(mvm, sr, weak, strong, 2016 current_tpt, weak_tpt, strong_tpt); 2017 2018 /* override actions if we are on the edge */ 2019 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2020 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2021 action = TPC_ACTION_STAY; 2022 } else if (strong == TPC_INVALID && 2023 (action == TPC_ACTION_INCREASE || 2024 action == TPC_ACTION_NO_RESTIRCTION)) { 2025 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2026 action = TPC_ACTION_STAY; 2027 } 2028 2029 switch (action) { 2030 case TPC_ACTION_DECREASE: 2031 lq_sta->lq.reduced_tpc = weak; 2032 return true; 2033 case TPC_ACTION_INCREASE: 2034 lq_sta->lq.reduced_tpc = strong; 2035 return true; 2036 case TPC_ACTION_NO_RESTIRCTION: 2037 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2038 return true; 2039 case TPC_ACTION_STAY: 2040 /* do nothing */ 2041 break; 2042 } 2043 return false; 2044 } 2045 2046 /* 2047 * Do rate scaling and search for new modulation mode. 2048 */ 2049 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2050 struct ieee80211_sta *sta, 2051 struct iwl_lq_sta *lq_sta, 2052 int tid, bool ndp) 2053 { 2054 int low = IWL_RATE_INVALID; 2055 int high = IWL_RATE_INVALID; 2056 int index; 2057 struct iwl_rate_scale_data *window = NULL; 2058 int current_tpt = IWL_INVALID_VALUE; 2059 int low_tpt = IWL_INVALID_VALUE; 2060 int high_tpt = IWL_INVALID_VALUE; 2061 u32 fail_count; 2062 enum rs_action scale_action = RS_ACTION_STAY; 2063 u16 rate_mask; 2064 u8 update_lq = 0; 2065 struct iwl_scale_tbl_info *tbl, *tbl1; 2066 u8 active_tbl = 0; 2067 u8 done_search = 0; 2068 u16 high_low; 2069 s32 sr; 2070 u8 prev_agg = lq_sta->is_agg; 2071 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2072 struct rs_rate *rate; 2073 2074 lq_sta->is_agg = !!mvmsta->agg_tids; 2075 2076 /* 2077 * Select rate-scale / modulation-mode table to work with in 2078 * the rest of this function: "search" if searching for better 2079 * modulation mode, or "active" if doing rate scaling within a mode. 2080 */ 2081 if (!lq_sta->search_better_tbl) 2082 active_tbl = lq_sta->active_tbl; 2083 else 2084 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2085 2086 tbl = &(lq_sta->lq_info[active_tbl]); 2087 rate = &tbl->rate; 2088 2089 if (prev_agg != lq_sta->is_agg) { 2090 IWL_DEBUG_RATE(mvm, 2091 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2092 prev_agg, lq_sta->is_agg); 2093 rs_set_expected_tpt_table(lq_sta, tbl); 2094 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2095 } 2096 2097 /* current tx rate */ 2098 index = rate->index; 2099 2100 /* rates available for this association, and for modulation mode */ 2101 rate_mask = rs_get_supported_rates(lq_sta, rate); 2102 2103 if (!(BIT(index) & rate_mask)) { 2104 IWL_ERR(mvm, "Current Rate is not valid\n"); 2105 if (lq_sta->search_better_tbl) { 2106 /* revert to active table if search table is not valid*/ 2107 rate->type = LQ_NONE; 2108 lq_sta->search_better_tbl = 0; 2109 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2110 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2111 } 2112 return; 2113 } 2114 2115 /* Get expected throughput table and history window for current rate */ 2116 if (!tbl->expected_tpt) { 2117 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2118 return; 2119 } 2120 2121 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2122 window = &(tbl->win[index]); 2123 2124 /* 2125 * If there is not enough history to calculate actual average 2126 * throughput, keep analyzing results of more tx frames, without 2127 * changing rate or mode (bypass most of the rest of this function). 2128 * Set up new rate table in uCode only if old rate is not supported 2129 * in current association (use new rate found above). 2130 */ 2131 fail_count = window->counter - window->success_counter; 2132 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2133 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2134 IWL_DEBUG_RATE(mvm, 2135 "%s: Test Window: succ %d total %d\n", 2136 rs_pretty_rate(rate), 2137 window->success_counter, window->counter); 2138 2139 /* Can't calculate this yet; not enough history */ 2140 window->average_tpt = IWL_INVALID_VALUE; 2141 2142 /* Should we stay with this modulation mode, 2143 * or search for a new one? */ 2144 rs_stay_in_table(lq_sta, false); 2145 2146 return; 2147 } 2148 2149 /* If we are searching for better modulation mode, check success. */ 2150 if (lq_sta->search_better_tbl) { 2151 /* If good success, continue using the "search" mode; 2152 * no need to send new link quality command, since we're 2153 * continuing to use the setup that we've been trying. */ 2154 if (window->average_tpt > lq_sta->last_tpt) { 2155 IWL_DEBUG_RATE(mvm, 2156 "SWITCHING TO NEW TABLE SR: %d " 2157 "cur-tpt %d old-tpt %d\n", 2158 window->success_ratio, 2159 window->average_tpt, 2160 lq_sta->last_tpt); 2161 2162 /* Swap tables; "search" becomes "active" */ 2163 lq_sta->active_tbl = active_tbl; 2164 current_tpt = window->average_tpt; 2165 /* Else poor success; go back to mode in "active" table */ 2166 } else { 2167 IWL_DEBUG_RATE(mvm, 2168 "GOING BACK TO THE OLD TABLE: SR %d " 2169 "cur-tpt %d old-tpt %d\n", 2170 window->success_ratio, 2171 window->average_tpt, 2172 lq_sta->last_tpt); 2173 2174 /* Nullify "search" table */ 2175 rate->type = LQ_NONE; 2176 2177 /* Revert to "active" table */ 2178 active_tbl = lq_sta->active_tbl; 2179 tbl = &(lq_sta->lq_info[active_tbl]); 2180 2181 /* Revert to "active" rate and throughput info */ 2182 index = tbl->rate.index; 2183 current_tpt = lq_sta->last_tpt; 2184 2185 /* Need to set up a new rate table in uCode */ 2186 update_lq = 1; 2187 } 2188 2189 /* Either way, we've made a decision; modulation mode 2190 * search is done, allow rate adjustment next time. */ 2191 lq_sta->search_better_tbl = 0; 2192 done_search = 1; /* Don't switch modes below! */ 2193 goto lq_update; 2194 } 2195 2196 /* (Else) not in search of better modulation mode, try for better 2197 * starting rate, while staying in this mode. */ 2198 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2199 low = high_low & 0xff; 2200 high = (high_low >> 8) & 0xff; 2201 2202 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2203 2204 sr = window->success_ratio; 2205 2206 /* Collect measured throughputs for current and adjacent rates */ 2207 current_tpt = window->average_tpt; 2208 if (low != IWL_RATE_INVALID) 2209 low_tpt = tbl->win[low].average_tpt; 2210 if (high != IWL_RATE_INVALID) 2211 high_tpt = tbl->win[high].average_tpt; 2212 2213 IWL_DEBUG_RATE(mvm, 2214 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2215 rs_pretty_rate(rate), current_tpt, sr, 2216 low, high, low_tpt, high_tpt); 2217 2218 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2219 current_tpt, low_tpt, high_tpt); 2220 2221 /* Force a search in case BT doesn't like us being in MIMO */ 2222 if (is_mimo(rate) && 2223 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2224 IWL_DEBUG_RATE(mvm, 2225 "BT Coex forbids MIMO. Search for new config\n"); 2226 rs_stay_in_table(lq_sta, true); 2227 goto lq_update; 2228 } 2229 2230 switch (scale_action) { 2231 case RS_ACTION_DOWNSCALE: 2232 /* Decrease starting rate, update uCode's rate table */ 2233 if (low != IWL_RATE_INVALID) { 2234 update_lq = 1; 2235 index = low; 2236 } else { 2237 IWL_DEBUG_RATE(mvm, 2238 "At the bottom rate. Can't decrease\n"); 2239 } 2240 2241 break; 2242 case RS_ACTION_UPSCALE: 2243 /* Increase starting rate, update uCode's rate table */ 2244 if (high != IWL_RATE_INVALID) { 2245 update_lq = 1; 2246 index = high; 2247 } else { 2248 IWL_DEBUG_RATE(mvm, 2249 "At the top rate. Can't increase\n"); 2250 } 2251 2252 break; 2253 case RS_ACTION_STAY: 2254 /* No change */ 2255 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2256 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2257 break; 2258 default: 2259 break; 2260 } 2261 2262 lq_update: 2263 /* Replace uCode's rate table for the destination station. */ 2264 if (update_lq) { 2265 tbl->rate.index = index; 2266 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2267 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2268 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2269 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2270 } 2271 2272 rs_stay_in_table(lq_sta, false); 2273 2274 /* 2275 * Search for new modulation mode if we're: 2276 * 1) Not changing rates right now 2277 * 2) Not just finishing up a search 2278 * 3) Allowing a new search 2279 */ 2280 if (!update_lq && !done_search && 2281 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2282 && window->counter) { 2283 enum rs_column next_column; 2284 2285 /* Save current throughput to compare with "search" throughput*/ 2286 lq_sta->last_tpt = current_tpt; 2287 2288 IWL_DEBUG_RATE(mvm, 2289 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2290 update_lq, done_search, lq_sta->rs_state, 2291 window->counter); 2292 2293 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2294 if (next_column != RS_COLUMN_INVALID) { 2295 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2296 next_column); 2297 if (!ret) 2298 lq_sta->search_better_tbl = 1; 2299 } else { 2300 IWL_DEBUG_RATE(mvm, 2301 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2302 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2303 } 2304 2305 /* If new "search" mode was selected, set up in uCode table */ 2306 if (lq_sta->search_better_tbl) { 2307 /* Access the "search" table, clear its history. */ 2308 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 2309 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2310 2311 /* Use new "search" start rate */ 2312 index = tbl->rate.index; 2313 2314 rs_dump_rate(mvm, &tbl->rate, 2315 "Switch to SEARCH TABLE:"); 2316 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2317 } else { 2318 done_search = 1; 2319 } 2320 } 2321 2322 if (!ndp) 2323 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2324 2325 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2326 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2327 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2328 } 2329 } 2330 2331 struct rs_init_rate_info { 2332 s8 rssi; 2333 u8 rate_idx; 2334 }; 2335 2336 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2337 { -60, IWL_RATE_54M_INDEX }, 2338 { -64, IWL_RATE_48M_INDEX }, 2339 { -68, IWL_RATE_36M_INDEX }, 2340 { -80, IWL_RATE_24M_INDEX }, 2341 { -84, IWL_RATE_18M_INDEX }, 2342 { -85, IWL_RATE_12M_INDEX }, 2343 { -86, IWL_RATE_11M_INDEX }, 2344 { -88, IWL_RATE_5M_INDEX }, 2345 { -90, IWL_RATE_2M_INDEX }, 2346 { S8_MIN, IWL_RATE_1M_INDEX }, 2347 }; 2348 2349 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2350 { -60, IWL_RATE_54M_INDEX }, 2351 { -64, IWL_RATE_48M_INDEX }, 2352 { -72, IWL_RATE_36M_INDEX }, 2353 { -80, IWL_RATE_24M_INDEX }, 2354 { -84, IWL_RATE_18M_INDEX }, 2355 { -85, IWL_RATE_12M_INDEX }, 2356 { -87, IWL_RATE_9M_INDEX }, 2357 { S8_MIN, IWL_RATE_6M_INDEX }, 2358 }; 2359 2360 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2361 { -60, IWL_RATE_MCS_7_INDEX }, 2362 { -64, IWL_RATE_MCS_6_INDEX }, 2363 { -68, IWL_RATE_MCS_5_INDEX }, 2364 { -72, IWL_RATE_MCS_4_INDEX }, 2365 { -80, IWL_RATE_MCS_3_INDEX }, 2366 { -84, IWL_RATE_MCS_2_INDEX }, 2367 { -85, IWL_RATE_MCS_1_INDEX }, 2368 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2369 }; 2370 2371 /* MCS index 9 is not valid for 20MHz VHT channel width, 2372 * but is ok for 40, 80 and 160MHz channels. 2373 */ 2374 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2375 { -60, IWL_RATE_MCS_8_INDEX }, 2376 { -64, IWL_RATE_MCS_7_INDEX }, 2377 { -68, IWL_RATE_MCS_6_INDEX }, 2378 { -72, IWL_RATE_MCS_5_INDEX }, 2379 { -80, IWL_RATE_MCS_4_INDEX }, 2380 { -84, IWL_RATE_MCS_3_INDEX }, 2381 { -85, IWL_RATE_MCS_2_INDEX }, 2382 { -87, IWL_RATE_MCS_1_INDEX }, 2383 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2384 }; 2385 2386 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2387 { -60, IWL_RATE_MCS_9_INDEX }, 2388 { -64, IWL_RATE_MCS_8_INDEX }, 2389 { -68, IWL_RATE_MCS_7_INDEX }, 2390 { -72, IWL_RATE_MCS_6_INDEX }, 2391 { -80, IWL_RATE_MCS_5_INDEX }, 2392 { -84, IWL_RATE_MCS_4_INDEX }, 2393 { -85, IWL_RATE_MCS_3_INDEX }, 2394 { -87, IWL_RATE_MCS_2_INDEX }, 2395 { -88, IWL_RATE_MCS_1_INDEX }, 2396 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2397 }; 2398 2399 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2400 2401 /* Init the optimal rate based on STA caps 2402 * This combined with rssi is used to report the last tx rate 2403 * to userspace when we haven't transmitted enough frames. 2404 */ 2405 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2406 struct ieee80211_sta *sta, 2407 struct iwl_lq_sta *lq_sta) 2408 { 2409 struct rs_rate *rate = &lq_sta->optimal_rate; 2410 2411 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2412 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2413 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2414 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2415 else if (lq_sta->band == NL80211_BAND_5GHZ) 2416 rate->type = LQ_LEGACY_A; 2417 else 2418 rate->type = LQ_LEGACY_G; 2419 2420 rate->bw = rs_bw_from_sta_bw(sta); 2421 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2422 2423 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2424 2425 if (is_mimo(rate)) { 2426 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2427 } else if (is_siso(rate)) { 2428 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2429 } else { 2430 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2431 2432 if (lq_sta->band == NL80211_BAND_5GHZ) { 2433 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2434 lq_sta->optimal_nentries = 2435 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2436 } else { 2437 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2438 lq_sta->optimal_nentries = 2439 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2440 } 2441 } 2442 2443 if (is_vht(rate)) { 2444 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2445 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2446 lq_sta->optimal_nentries = 2447 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2448 } else { 2449 lq_sta->optimal_rates = rs_optimal_rates_vht; 2450 lq_sta->optimal_nentries = 2451 ARRAY_SIZE(rs_optimal_rates_vht); 2452 } 2453 } else if (is_ht(rate)) { 2454 lq_sta->optimal_rates = rs_optimal_rates_ht; 2455 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2456 } 2457 } 2458 2459 /* Compute the optimal rate index based on RSSI */ 2460 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2461 struct iwl_lq_sta *lq_sta) 2462 { 2463 struct rs_rate *rate = &lq_sta->optimal_rate; 2464 int i; 2465 2466 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2467 BITS_PER_LONG); 2468 2469 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2470 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2471 2472 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2473 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2474 rate->index = rate_idx; 2475 break; 2476 } 2477 } 2478 2479 return rate; 2480 } 2481 2482 /* Choose an initial legacy rate and antenna to use based on the RSSI 2483 * of last Rx 2484 */ 2485 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2486 struct ieee80211_sta *sta, 2487 struct iwl_lq_sta *lq_sta, 2488 enum nl80211_band band, 2489 struct rs_rate *rate) 2490 { 2491 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2492 int i, nentries; 2493 unsigned long active_rate; 2494 s8 best_rssi = S8_MIN; 2495 u8 best_ant = ANT_NONE; 2496 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2497 const struct rs_init_rate_info *initial_rates; 2498 2499 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2500 if (!(lq_sta->pers.chains & BIT(i))) 2501 continue; 2502 2503 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2504 best_rssi = lq_sta->pers.chain_signal[i]; 2505 best_ant = BIT(i); 2506 } 2507 } 2508 2509 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2510 iwl_rs_pretty_ant(best_ant), best_rssi); 2511 2512 if (best_ant != ANT_A && best_ant != ANT_B) 2513 rate->ant = first_antenna(valid_tx_ant); 2514 else 2515 rate->ant = best_ant; 2516 2517 rate->sgi = false; 2518 rate->ldpc = false; 2519 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2520 2521 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2522 BITS_PER_LONG); 2523 2524 if (band == NL80211_BAND_5GHZ) { 2525 rate->type = LQ_LEGACY_A; 2526 initial_rates = rs_optimal_rates_5ghz_legacy; 2527 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2528 } else { 2529 rate->type = LQ_LEGACY_G; 2530 initial_rates = rs_optimal_rates_24ghz_legacy; 2531 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2532 } 2533 2534 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2535 goto out; 2536 2537 /* Start from a higher rate if the corresponding debug capability 2538 * is enabled. The rate is chosen according to AP capabilities. 2539 * In case of VHT/HT when the rssi is low fallback to the case of 2540 * legacy rates. 2541 */ 2542 if (sta->vht_cap.vht_supported && 2543 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2544 /* 2545 * In AP mode, when a new station associates, rs is initialized 2546 * immediately upon association completion, before the phy 2547 * context is updated with the association parameters, so the 2548 * sta bandwidth might be wider than the phy context allows. 2549 * To avoid this issue, always initialize rs with 20mhz 2550 * bandwidth rate, and after authorization, when the phy context 2551 * is already up-to-date, re-init rs with the correct bw. 2552 */ 2553 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2554 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2555 2556 switch (bw) { 2557 case RATE_MCS_CHAN_WIDTH_40: 2558 case RATE_MCS_CHAN_WIDTH_80: 2559 case RATE_MCS_CHAN_WIDTH_160: 2560 initial_rates = rs_optimal_rates_vht; 2561 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2562 break; 2563 case RATE_MCS_CHAN_WIDTH_20: 2564 initial_rates = rs_optimal_rates_vht_20mhz; 2565 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2566 break; 2567 default: 2568 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2569 goto out; 2570 } 2571 2572 active_rate = lq_sta->active_siso_rate; 2573 rate->type = LQ_VHT_SISO; 2574 rate->bw = bw; 2575 } else if (sta->ht_cap.ht_supported && 2576 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2577 initial_rates = rs_optimal_rates_ht; 2578 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2579 active_rate = lq_sta->active_siso_rate; 2580 rate->type = LQ_HT_SISO; 2581 } else { 2582 active_rate = lq_sta->active_legacy_rate; 2583 } 2584 2585 for (i = 0; i < nentries; i++) { 2586 int rate_idx = initial_rates[i].rate_idx; 2587 2588 if ((best_rssi >= initial_rates[i].rssi) && 2589 (BIT(rate_idx) & active_rate)) { 2590 rate->index = rate_idx; 2591 break; 2592 } 2593 } 2594 2595 out: 2596 rs_dump_rate(mvm, rate, "INITIAL"); 2597 } 2598 2599 /* Save info about RSSI of last Rx */ 2600 void rs_update_last_rssi(struct iwl_mvm *mvm, 2601 struct iwl_mvm_sta *mvmsta, 2602 struct ieee80211_rx_status *rx_status) 2603 { 2604 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2605 int i; 2606 2607 lq_sta->pers.chains = rx_status->chains; 2608 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2609 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2610 lq_sta->pers.last_rssi = S8_MIN; 2611 2612 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2613 if (!(lq_sta->pers.chains & BIT(i))) 2614 continue; 2615 2616 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2617 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2618 } 2619 } 2620 2621 /* 2622 * rs_initialize_lq - Initialize a station's hardware rate table 2623 * 2624 * The uCode's station table contains a table of fallback rates 2625 * for automatic fallback during transmission. 2626 * 2627 * NOTE: This sets up a default set of values. These will be replaced later 2628 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2629 * rc80211_simple. 2630 * 2631 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2632 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2633 * which requires station table entry to exist). 2634 */ 2635 static void rs_initialize_lq(struct iwl_mvm *mvm, 2636 struct ieee80211_sta *sta, 2637 struct iwl_lq_sta *lq_sta, 2638 enum nl80211_band band) 2639 { 2640 struct iwl_scale_tbl_info *tbl; 2641 struct rs_rate *rate; 2642 u8 active_tbl = 0; 2643 2644 if (!sta || !lq_sta) 2645 return; 2646 2647 if (!lq_sta->search_better_tbl) 2648 active_tbl = lq_sta->active_tbl; 2649 else 2650 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2651 2652 tbl = &(lq_sta->lq_info[active_tbl]); 2653 rate = &tbl->rate; 2654 2655 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2656 rs_init_optimal_rate(mvm, sta, lq_sta); 2657 2658 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2659 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2660 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2661 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2662 2663 tbl->column = rs_get_column_from_rate(rate); 2664 2665 rs_set_expected_tpt_table(lq_sta, tbl); 2666 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2667 /* TODO restore station should remember the lq cmd */ 2668 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 2669 } 2670 2671 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2672 void *mvm_sta, 2673 struct ieee80211_tx_rate_control *txrc) 2674 { 2675 struct iwl_op_mode *op_mode = mvm_r; 2676 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2677 struct sk_buff *skb = txrc->skb; 2678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2679 struct iwl_lq_sta *lq_sta; 2680 struct rs_rate *optimal_rate; 2681 u32 last_ucode_rate; 2682 2683 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2684 /* if vif isn't initialized mvm doesn't know about 2685 * this station, so don't do anything with the it 2686 */ 2687 sta = NULL; 2688 mvm_sta = NULL; 2689 } 2690 2691 if (!mvm_sta) 2692 return; 2693 2694 lq_sta = mvm_sta; 2695 iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags, 2696 info->band, &info->control.rates[0]); 2697 info->control.rates[0].count = 1; 2698 2699 /* Report the optimal rate based on rssi and STA caps if we haven't 2700 * converged yet (too little traffic) or exploring other modulations 2701 */ 2702 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2703 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2704 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2705 optimal_rate); 2706 iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band, 2707 &txrc->reported_rate); 2708 } 2709 } 2710 2711 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2712 gfp_t gfp) 2713 { 2714 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2715 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2716 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2717 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2718 2719 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2720 2721 lq_sta->pers.drv = mvm; 2722 #ifdef CONFIG_MAC80211_DEBUGFS 2723 lq_sta->pers.dbg_fixed_rate = 0; 2724 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2725 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2726 #endif 2727 lq_sta->pers.chains = 0; 2728 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2729 lq_sta->pers.last_rssi = S8_MIN; 2730 2731 return lq_sta; 2732 } 2733 2734 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2735 int nss) 2736 { 2737 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2738 (0x3 << (2 * (nss - 1))); 2739 rx_mcs >>= (2 * (nss - 1)); 2740 2741 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2742 return IWL_RATE_MCS_7_INDEX; 2743 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2744 return IWL_RATE_MCS_8_INDEX; 2745 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2746 return IWL_RATE_MCS_9_INDEX; 2747 2748 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2749 return -1; 2750 } 2751 2752 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2753 struct ieee80211_sta_vht_cap *vht_cap, 2754 struct iwl_lq_sta *lq_sta) 2755 { 2756 int i; 2757 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2758 2759 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2760 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2761 if (i == IWL_RATE_9M_INDEX) 2762 continue; 2763 2764 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2765 if (i == IWL_RATE_MCS_9_INDEX && 2766 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2767 continue; 2768 2769 lq_sta->active_siso_rate |= BIT(i); 2770 } 2771 } 2772 2773 if (sta->rx_nss < 2) 2774 return; 2775 2776 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2777 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2778 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2779 if (i == IWL_RATE_9M_INDEX) 2780 continue; 2781 2782 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2783 if (i == IWL_RATE_MCS_9_INDEX && 2784 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2785 continue; 2786 2787 lq_sta->active_mimo2_rate |= BIT(i); 2788 } 2789 } 2790 } 2791 2792 static void rs_ht_init(struct iwl_mvm *mvm, 2793 struct ieee80211_sta *sta, 2794 struct iwl_lq_sta *lq_sta, 2795 struct ieee80211_sta_ht_cap *ht_cap) 2796 { 2797 /* active_siso_rate mask includes 9 MBits (bit 5), 2798 * and CCK (bits 0-3), supp_rates[] does not; 2799 * shift to convert format, force 9 MBits off. 2800 */ 2801 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2802 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2803 lq_sta->active_siso_rate &= ~((u16)0x2); 2804 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2805 2806 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2807 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2808 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2809 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2810 2811 if (mvm->cfg->ht_params->ldpc && 2812 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2813 lq_sta->ldpc = true; 2814 2815 if (mvm->cfg->ht_params->stbc && 2816 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2817 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2818 lq_sta->stbc_capable = true; 2819 2820 lq_sta->is_vht = false; 2821 } 2822 2823 static void rs_vht_init(struct iwl_mvm *mvm, 2824 struct ieee80211_sta *sta, 2825 struct iwl_lq_sta *lq_sta, 2826 struct ieee80211_sta_vht_cap *vht_cap) 2827 { 2828 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2829 2830 if (mvm->cfg->ht_params->ldpc && 2831 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2832 lq_sta->ldpc = true; 2833 2834 if (mvm->cfg->ht_params->stbc && 2835 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2836 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2837 lq_sta->stbc_capable = true; 2838 2839 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2840 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2841 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2842 lq_sta->bfer_capable = true; 2843 2844 lq_sta->is_vht = true; 2845 } 2846 2847 #ifdef CONFIG_IWLWIFI_DEBUGFS 2848 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2849 { 2850 spin_lock_bh(&mvm->drv_stats_lock); 2851 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2852 spin_unlock_bh(&mvm->drv_stats_lock); 2853 } 2854 2855 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2856 { 2857 u8 nss = 0; 2858 2859 spin_lock(&mvm->drv_stats_lock); 2860 2861 if (agg) 2862 mvm->drv_rx_stats.agg_frames++; 2863 2864 mvm->drv_rx_stats.success_frames++; 2865 2866 switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) { 2867 case RATE_MCS_CHAN_WIDTH_20: 2868 mvm->drv_rx_stats.bw_20_frames++; 2869 break; 2870 case RATE_MCS_CHAN_WIDTH_40: 2871 mvm->drv_rx_stats.bw_40_frames++; 2872 break; 2873 case RATE_MCS_CHAN_WIDTH_80: 2874 mvm->drv_rx_stats.bw_80_frames++; 2875 break; 2876 case RATE_MCS_CHAN_WIDTH_160: 2877 mvm->drv_rx_stats.bw_160_frames++; 2878 break; 2879 default: 2880 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2881 } 2882 2883 if (rate & RATE_MCS_HT_MSK_V1) { 2884 mvm->drv_rx_stats.ht_frames++; 2885 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1; 2886 } else if (rate & RATE_MCS_VHT_MSK_V1) { 2887 mvm->drv_rx_stats.vht_frames++; 2888 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2889 RATE_VHT_MCS_NSS_POS) + 1; 2890 } else { 2891 mvm->drv_rx_stats.legacy_frames++; 2892 } 2893 2894 if (nss == 1) 2895 mvm->drv_rx_stats.siso_frames++; 2896 else if (nss == 2) 2897 mvm->drv_rx_stats.mimo2_frames++; 2898 2899 if (rate & RATE_MCS_SGI_MSK_V1) 2900 mvm->drv_rx_stats.sgi_frames++; 2901 else 2902 mvm->drv_rx_stats.ngi_frames++; 2903 2904 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2905 mvm->drv_rx_stats.last_frame_idx = 2906 (mvm->drv_rx_stats.last_frame_idx + 1) % 2907 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2908 2909 spin_unlock(&mvm->drv_stats_lock); 2910 } 2911 #endif 2912 2913 /* 2914 * Called after adding a new station to initialize rate scaling 2915 */ 2916 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2917 enum nl80211_band band) 2918 { 2919 int i, j; 2920 struct ieee80211_hw *hw = mvm->hw; 2921 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2922 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2923 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2924 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2925 struct ieee80211_supported_band *sband; 2926 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2927 2928 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock); 2929 2930 /* clear all non-persistent lq data */ 2931 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2932 2933 sband = hw->wiphy->bands[band]; 2934 2935 lq_sta->lq.sta_id = mvmsta->sta_id; 2936 mvmsta->amsdu_enabled = 0; 2937 mvmsta->max_amsdu_len = sta->max_amsdu_len; 2938 2939 for (j = 0; j < LQ_SIZE; j++) 2940 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2941 2942 lq_sta->flush_timer = 0; 2943 lq_sta->last_tx = jiffies; 2944 2945 IWL_DEBUG_RATE(mvm, 2946 "LQ: *** rate scale station global init for station %d ***\n", 2947 mvmsta->sta_id); 2948 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2949 * the lowest or the highest rate.. Could consider using RSSI from 2950 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2951 * after assoc.. */ 2952 2953 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 2954 lq_sta->band = sband->band; 2955 /* 2956 * active legacy rates as per supported rates bitmap 2957 */ 2958 supp = sta->supp_rates[sband->band]; 2959 lq_sta->active_legacy_rate = 0; 2960 for_each_set_bit(i, &supp, BITS_PER_LONG) 2961 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 2962 2963 /* TODO: should probably account for rx_highest for both HT/VHT */ 2964 if (!vht_cap || !vht_cap->vht_supported) 2965 rs_ht_init(mvm, sta, lq_sta, ht_cap); 2966 else 2967 rs_vht_init(mvm, sta, lq_sta, vht_cap); 2968 2969 lq_sta->max_legacy_rate_idx = 2970 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 2971 lq_sta->max_siso_rate_idx = 2972 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 2973 lq_sta->max_mimo2_rate_idx = 2974 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 2975 2976 IWL_DEBUG_RATE(mvm, 2977 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 2978 lq_sta->active_legacy_rate, 2979 lq_sta->active_siso_rate, 2980 lq_sta->active_mimo2_rate, 2981 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 2982 lq_sta->bfer_capable); 2983 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 2984 lq_sta->max_legacy_rate_idx, 2985 lq_sta->max_siso_rate_idx, 2986 lq_sta->max_mimo2_rate_idx); 2987 2988 /* These values will be overridden later */ 2989 lq_sta->lq.single_stream_ant_msk = 2990 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 2991 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 2992 2993 /* as default allow aggregation for all tids */ 2994 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 2995 lq_sta->is_agg = 0; 2996 #ifdef CONFIG_IWLWIFI_DEBUGFS 2997 iwl_mvm_reset_frame_stats(mvm); 2998 #endif 2999 rs_initialize_lq(mvm, sta, lq_sta, band); 3000 } 3001 3002 static void rs_drv_rate_update(void *mvm_r, 3003 struct ieee80211_supported_band *sband, 3004 struct cfg80211_chan_def *chandef, 3005 struct ieee80211_sta *sta, 3006 void *priv_sta, u32 changed) 3007 { 3008 struct iwl_op_mode *op_mode = mvm_r; 3009 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3010 u8 tid; 3011 3012 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3013 return; 3014 3015 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3016 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3017 ieee80211_stop_tx_ba_session(sta, tid); 3018 3019 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3020 } 3021 3022 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, 3023 struct ieee80211_sta *sta, 3024 int tid, struct ieee80211_tx_info *info, 3025 bool ndp) 3026 { 3027 int legacy_success; 3028 int retries; 3029 int i; 3030 struct iwl_lq_cmd *table; 3031 u32 lq_hwrate; 3032 struct rs_rate lq_rate, tx_resp_rate; 3033 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 3034 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 3035 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 3036 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 3037 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 3038 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3039 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3040 3041 if (!lq_sta->pers.drv) { 3042 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 3043 return; 3044 } 3045 3046 /* This packet was aggregated but doesn't carry status info */ 3047 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 3048 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 3049 return; 3050 3051 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 3052 &tx_resp_rate)) { 3053 WARN_ON_ONCE(1); 3054 return; 3055 } 3056 3057 #ifdef CONFIG_MAC80211_DEBUGFS 3058 /* Disable last tx check if we are debugging with fixed rate but 3059 * update tx stats 3060 */ 3061 if (lq_sta->pers.dbg_fixed_rate) { 3062 int index = tx_resp_rate.index; 3063 enum rs_column column; 3064 int attempts, success; 3065 3066 column = rs_get_column_from_rate(&tx_resp_rate); 3067 if (WARN_ONCE(column == RS_COLUMN_INVALID, 3068 "Can't map rate 0x%x to column", 3069 tx_resp_hwrate)) 3070 return; 3071 3072 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3073 attempts = info->status.ampdu_len; 3074 success = info->status.ampdu_ack_len; 3075 } else { 3076 attempts = info->status.rates[0].count; 3077 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3078 } 3079 3080 lq_sta->pers.tx_stats[column][index].total += attempts; 3081 lq_sta->pers.tx_stats[column][index].success += success; 3082 3083 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 3084 tx_resp_hwrate, success, attempts); 3085 return; 3086 } 3087 #endif 3088 3089 if (time_after(jiffies, 3090 (unsigned long)(lq_sta->last_tx + 3091 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 3092 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 3093 /* reach here only in case of driver RS, call directly 3094 * the unlocked version 3095 */ 3096 rs_drv_rate_init(mvm, sta, info->band); 3097 return; 3098 } 3099 lq_sta->last_tx = jiffies; 3100 3101 /* Ignore this Tx frame response if its initial rate doesn't match 3102 * that of latest Link Quality command. There may be stragglers 3103 * from a previous Link Quality command, but we're no longer interested 3104 * in those; they're either from the "active" mode while we're trying 3105 * to check "search" mode, or a prior "search" mode after we've moved 3106 * to a new "search" mode (which might become the new "active" mode). 3107 */ 3108 table = &lq_sta->lq; 3109 lq_hwrate = le32_to_cpu(table->rs_table[0]); 3110 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 3111 WARN_ON_ONCE(1); 3112 return; 3113 } 3114 3115 /* Here we actually compare this rate to the latest LQ command */ 3116 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 3117 IWL_DEBUG_RATE(mvm, 3118 "tx resp color 0x%x does not match 0x%x\n", 3119 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 3120 3121 /* Since rates mis-match, the last LQ command may have failed. 3122 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 3123 * ... driver. 3124 */ 3125 lq_sta->missed_rate_counter++; 3126 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 3127 lq_sta->missed_rate_counter = 0; 3128 IWL_DEBUG_RATE(mvm, 3129 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 3130 lq_sta->rs_state); 3131 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 3132 } 3133 /* Regardless, ignore this status info for outdated rate */ 3134 return; 3135 } 3136 3137 /* Rate did match, so reset the missed_rate_counter */ 3138 lq_sta->missed_rate_counter = 0; 3139 3140 if (!lq_sta->search_better_tbl) { 3141 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3142 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3143 } else { 3144 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3145 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3146 } 3147 3148 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 3149 IWL_DEBUG_RATE(mvm, 3150 "Neither active nor search matches tx rate\n"); 3151 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3152 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 3153 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3154 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 3155 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 3156 3157 /* no matching table found, let's by-pass the data collection 3158 * and continue to perform rate scale to find the rate table 3159 */ 3160 rs_stay_in_table(lq_sta, true); 3161 goto done; 3162 } 3163 3164 /* Updating the frame history depends on whether packets were 3165 * aggregated. 3166 * 3167 * For aggregation, all packets were transmitted at the same rate, the 3168 * first index into rate scale table. 3169 */ 3170 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3171 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 3172 info->status.ampdu_len, 3173 info->status.ampdu_ack_len, 3174 reduced_txp); 3175 3176 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 3177 * it as a single frame loss as we don't want the success ratio 3178 * to dip too quickly because a BA wasn't received. 3179 * For TPC, there's no need for this optimisation since we want 3180 * to recover very quickly from a bad power reduction and, 3181 * therefore we'd like the success ratio to get an immediate hit 3182 * when failing to get a BA, so we'd switch back to a lower or 3183 * zero power reduction. When FW transmits agg with a rate 3184 * different from the initial rate, it will not use reduced txp 3185 * and will send BA notification twice (one empty with reduced 3186 * txp equal to the value from LQ and one with reduced txp 0). 3187 * We need to update counters for each txp level accordingly. 3188 */ 3189 if (info->status.ampdu_ack_len == 0) 3190 info->status.ampdu_len = 1; 3191 3192 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, 3193 tx_resp_rate.index, 3194 info->status.ampdu_len, 3195 info->status.ampdu_ack_len); 3196 3197 /* Update success/fail counts if not searching for new mode */ 3198 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3199 lq_sta->total_success += info->status.ampdu_ack_len; 3200 lq_sta->total_failed += (info->status.ampdu_len - 3201 info->status.ampdu_ack_len); 3202 } 3203 } else { 3204 /* For legacy, update frame history with for each Tx retry. */ 3205 retries = info->status.rates[0].count - 1; 3206 /* HW doesn't send more than 15 retries */ 3207 retries = min(retries, 15); 3208 3209 /* The last transmission may have been successful */ 3210 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3211 /* Collect data for each rate used during failed TX attempts */ 3212 for (i = 0; i <= retries; ++i) { 3213 lq_hwrate = le32_to_cpu(table->rs_table[i]); 3214 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 3215 &lq_rate)) { 3216 WARN_ON_ONCE(1); 3217 return; 3218 } 3219 3220 /* Only collect stats if retried rate is in the same RS 3221 * table as active/search. 3222 */ 3223 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 3224 tmp_tbl = curr_tbl; 3225 else if (rs_rate_column_match(&lq_rate, 3226 &other_tbl->rate)) 3227 tmp_tbl = other_tbl; 3228 else 3229 continue; 3230 3231 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 3232 tx_resp_rate.index, 1, 3233 i < retries ? 0 : legacy_success, 3234 reduced_txp); 3235 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 3236 tx_resp_rate.index, 1, 3237 i < retries ? 0 : legacy_success); 3238 } 3239 3240 /* Update success/fail counts if not searching for new mode */ 3241 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3242 lq_sta->total_success += legacy_success; 3243 lq_sta->total_failed += retries + (1 - legacy_success); 3244 } 3245 } 3246 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 3247 lq_sta->last_rate_n_flags = lq_hwrate; 3248 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 3249 done: 3250 /* See if there's a better rate or modulation mode to try. */ 3251 if (sta->supp_rates[info->band]) 3252 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 3253 } 3254 3255 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3256 int tid, struct ieee80211_tx_info *info, bool ndp) 3257 { 3258 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3259 3260 /* If it's locked we are in middle of init flow 3261 * just wait for next tx status to update the lq_sta data 3262 */ 3263 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock)) 3264 return; 3265 3266 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp); 3267 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 3268 } 3269 3270 #ifdef CONFIG_MAC80211_DEBUGFS 3271 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3272 struct iwl_lq_cmd *lq_cmd, 3273 enum nl80211_band band, 3274 u32 ucode_rate) 3275 { 3276 struct rs_rate rate; 3277 int i; 3278 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3279 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3280 u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS; 3281 3282 for (i = 0; i < num_rates; i++) 3283 lq_cmd->rs_table[i] = ucode_rate_le32; 3284 3285 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3286 WARN_ON_ONCE(1); 3287 return; 3288 } 3289 3290 if (is_mimo(&rate)) 3291 lq_cmd->mimo_delim = num_rates - 1; 3292 else 3293 lq_cmd->mimo_delim = 0; 3294 3295 lq_cmd->reduced_tpc = 0; 3296 3297 if (num_of_ant(ant) == 1) 3298 lq_cmd->single_stream_ant_msk = ant; 3299 3300 if (!mvm->trans->trans_cfg->gen2) 3301 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3302 else 3303 lq_cmd->agg_frame_cnt_limit = 3304 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3305 } 3306 #endif /* CONFIG_MAC80211_DEBUGFS */ 3307 3308 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3309 struct iwl_lq_sta *lq_sta, 3310 struct rs_rate *rate, 3311 __le32 *rs_table, int *rs_table_index, 3312 int num_rates, int num_retries, 3313 u8 valid_tx_ant, bool toggle_ant) 3314 { 3315 int i, j; 3316 __le32 ucode_rate; 3317 bool bottom_reached = false; 3318 int prev_rate_idx = rate->index; 3319 int end = LINK_QUAL_MAX_RETRY_NUM; 3320 int index = *rs_table_index; 3321 3322 for (i = 0; i < num_rates && index < end; i++) { 3323 for (j = 0; j < num_retries && index < end; j++, index++) { 3324 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3325 rate)); 3326 rs_table[index] = ucode_rate; 3327 if (toggle_ant) 3328 rs_toggle_antenna(valid_tx_ant, rate); 3329 } 3330 3331 prev_rate_idx = rate->index; 3332 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3333 if (bottom_reached && !is_legacy(rate)) 3334 break; 3335 } 3336 3337 if (!bottom_reached && !is_legacy(rate)) 3338 rate->index = prev_rate_idx; 3339 3340 *rs_table_index = index; 3341 } 3342 3343 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3344 * column the rate table should look like this: 3345 * 3346 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3347 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3348 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3349 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3350 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3351 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3352 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3353 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3354 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3355 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3356 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3357 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3358 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3359 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3360 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3361 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3362 */ 3363 static void rs_build_rates_table(struct iwl_mvm *mvm, 3364 struct ieee80211_sta *sta, 3365 struct iwl_lq_sta *lq_sta, 3366 const struct rs_rate *initial_rate) 3367 { 3368 struct rs_rate rate; 3369 int num_rates, num_retries, index = 0; 3370 u8 valid_tx_ant = 0; 3371 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3372 bool toggle_ant = false; 3373 u32 color; 3374 3375 memcpy(&rate, initial_rate, sizeof(rate)); 3376 3377 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3378 3379 /* TODO: remove old API when min FW API hits 14 */ 3380 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3381 rs_stbc_allow(mvm, sta, lq_sta)) 3382 rate.stbc = true; 3383 3384 if (is_siso(&rate)) { 3385 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3386 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3387 } else if (is_mimo(&rate)) { 3388 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3389 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3390 } else { 3391 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3392 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3393 toggle_ant = true; 3394 } 3395 3396 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3397 num_rates, num_retries, valid_tx_ant, 3398 toggle_ant); 3399 3400 rs_get_lower_rate_down_column(lq_sta, &rate); 3401 3402 if (is_siso(&rate)) { 3403 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3404 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3405 lq_cmd->mimo_delim = index; 3406 } else if (is_legacy(&rate)) { 3407 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3408 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3409 } else { 3410 WARN_ON_ONCE(1); 3411 } 3412 3413 toggle_ant = true; 3414 3415 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3416 num_rates, num_retries, valid_tx_ant, 3417 toggle_ant); 3418 3419 rs_get_lower_rate_down_column(lq_sta, &rate); 3420 3421 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3422 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3423 3424 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3425 num_rates, num_retries, valid_tx_ant, 3426 toggle_ant); 3427 3428 /* update the color of the LQ command (as a counter at bits 1-3) */ 3429 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3430 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3431 } 3432 3433 struct rs_bfer_active_iter_data { 3434 struct ieee80211_sta *exclude_sta; 3435 struct iwl_mvm_sta *bfer_mvmsta; 3436 }; 3437 3438 static void rs_bfer_active_iter(void *_data, 3439 struct ieee80211_sta *sta) 3440 { 3441 struct rs_bfer_active_iter_data *data = _data; 3442 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3443 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3444 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3445 3446 if (sta == data->exclude_sta) 3447 return; 3448 3449 /* The current sta has BFER allowed */ 3450 if (ss_params & LQ_SS_BFER_ALLOWED) { 3451 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3452 3453 data->bfer_mvmsta = mvmsta; 3454 } 3455 } 3456 3457 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3458 { 3459 int prio = -1; 3460 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3461 3462 switch (viftype) { 3463 case NL80211_IFTYPE_AP: 3464 case NL80211_IFTYPE_P2P_GO: 3465 prio = 3; 3466 break; 3467 case NL80211_IFTYPE_P2P_CLIENT: 3468 prio = 2; 3469 break; 3470 case NL80211_IFTYPE_STATION: 3471 prio = 1; 3472 break; 3473 default: 3474 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3475 prio = -1; 3476 } 3477 3478 return prio; 3479 } 3480 3481 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3482 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3483 struct iwl_mvm_sta *sta2) 3484 { 3485 int prio1 = rs_bfer_priority(sta1); 3486 int prio2 = rs_bfer_priority(sta2); 3487 3488 if (prio1 > prio2) 3489 return 1; 3490 if (prio1 < prio2) 3491 return -1; 3492 return 0; 3493 } 3494 3495 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3496 struct ieee80211_sta *sta, 3497 struct iwl_lq_sta *lq_sta, 3498 const struct rs_rate *initial_rate) 3499 { 3500 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3501 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3502 struct rs_bfer_active_iter_data data = { 3503 .exclude_sta = sta, 3504 .bfer_mvmsta = NULL, 3505 }; 3506 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3507 u32 ss_params = LQ_SS_PARAMS_VALID; 3508 3509 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3510 goto out; 3511 3512 #ifdef CONFIG_MAC80211_DEBUGFS 3513 /* Check if forcing the decision is configured. 3514 * Note that SISO is forced by not allowing STBC or BFER 3515 */ 3516 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3517 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3518 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3519 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3520 3521 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3522 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3523 lq_sta->pers.ss_force); 3524 goto out; 3525 } 3526 #endif 3527 3528 if (lq_sta->stbc_capable) 3529 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3530 3531 if (!lq_sta->bfer_capable) 3532 goto out; 3533 3534 ieee80211_iterate_stations_atomic(mvm->hw, 3535 rs_bfer_active_iter, 3536 &data); 3537 bfer_mvmsta = data.bfer_mvmsta; 3538 3539 /* This code is safe as it doesn't run concurrently for different 3540 * stations. This is guaranteed by the fact that calls to 3541 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3542 */ 3543 if (!bfer_mvmsta) { 3544 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3545 3546 ss_params |= LQ_SS_BFER_ALLOWED; 3547 goto out; 3548 } 3549 3550 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3551 bfer_mvmsta->sta_id); 3552 3553 /* Disallow BFER on another STA if active and we're a higher priority */ 3554 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3555 struct iwl_lq_cmd *bfersta_lq_cmd = 3556 &bfer_mvmsta->lq_sta.rs_drv.lq; 3557 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3558 3559 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3560 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3561 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd); 3562 3563 ss_params |= LQ_SS_BFER_ALLOWED; 3564 IWL_DEBUG_RATE(mvm, 3565 "Lower priority BFER sta found (%d). Switch BFER\n", 3566 bfer_mvmsta->sta_id); 3567 } 3568 out: 3569 lq_cmd->ss_params = cpu_to_le32(ss_params); 3570 } 3571 3572 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3573 struct ieee80211_sta *sta, 3574 struct iwl_lq_sta *lq_sta, 3575 const struct rs_rate *initial_rate) 3576 { 3577 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3578 struct iwl_mvm_sta *mvmsta; 3579 struct iwl_mvm_vif *mvmvif; 3580 3581 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3582 lq_cmd->agg_time_limit = 3583 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3584 3585 #ifdef CONFIG_MAC80211_DEBUGFS 3586 if (lq_sta->pers.dbg_fixed_rate) { 3587 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3588 lq_sta->band, 3589 lq_sta->pers.dbg_fixed_rate); 3590 return; 3591 } 3592 #endif 3593 if (WARN_ON_ONCE(!sta || !initial_rate)) 3594 return; 3595 3596 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3597 3598 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3599 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3600 3601 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3602 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3603 3604 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3605 num_of_ant(initial_rate->ant) == 1) 3606 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3607 3608 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3609 3610 /* 3611 * In case of low latency, tell the firmware to leave a frame in the 3612 * Tx Fifo so that it can start a transaction in the same TxOP. This 3613 * basically allows the firmware to send bursts. 3614 */ 3615 if (iwl_mvm_vif_low_latency(mvmvif)) 3616 lq_cmd->agg_frame_cnt_limit--; 3617 3618 if (mvmsta->vif->p2p) 3619 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3620 3621 lq_cmd->agg_time_limit = 3622 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3623 } 3624 3625 static void *rs_alloc(struct ieee80211_hw *hw) 3626 { 3627 return hw->priv; 3628 } 3629 3630 /* rate scale requires free function to be implemented */ 3631 static void rs_free(void *mvm_rate) 3632 { 3633 return; 3634 } 3635 3636 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3637 { 3638 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3639 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3640 3641 IWL_DEBUG_RATE(mvm, "enter\n"); 3642 IWL_DEBUG_RATE(mvm, "leave\n"); 3643 } 3644 3645 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate) 3646 { 3647 3648 char *type; 3649 u8 mcs = 0, nss = 0; 3650 u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS; 3651 u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >> 3652 RATE_MCS_CHAN_WIDTH_POS; 3653 3654 if (!(rate & RATE_MCS_HT_MSK_V1) && 3655 !(rate & RATE_MCS_VHT_MSK_V1) && 3656 !(rate & RATE_MCS_HE_MSK_V1)) { 3657 int index = iwl_hwrate_to_plcp_idx(rate); 3658 3659 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps", 3660 iwl_rs_pretty_ant(ant), 3661 index == IWL_RATE_INVALID ? "BAD" : 3662 iwl_rate_mcs(index)->mbps); 3663 } 3664 3665 if (rate & RATE_MCS_VHT_MSK_V1) { 3666 type = "VHT"; 3667 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3668 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3669 >> RATE_VHT_MCS_NSS_POS) + 1; 3670 } else if (rate & RATE_MCS_HT_MSK_V1) { 3671 type = "HT"; 3672 mcs = rate & RATE_HT_MCS_INDEX_MSK_V1; 3673 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) 3674 >> RATE_HT_MCS_NSS_POS_V1) + 1; 3675 } else if (rate & RATE_MCS_HE_MSK_V1) { 3676 type = "HE"; 3677 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3678 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3679 >> RATE_VHT_MCS_NSS_POS) + 1; 3680 } else { 3681 type = "Unknown"; /* shouldn't happen */ 3682 } 3683 3684 return scnprintf(buf, bufsz, 3685 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s", 3686 rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss, 3687 (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ", 3688 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3689 (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "", 3690 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "", 3691 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3692 } 3693 3694 #ifdef CONFIG_MAC80211_DEBUGFS 3695 /* 3696 * Program the device to use fixed rate for frame transmit 3697 * This is for debugging/testing only 3698 * once the device start use fixed rate, we need to reload the module 3699 * to being back the normal operation. 3700 */ 3701 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3702 struct iwl_lq_sta *lq_sta) 3703 { 3704 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3705 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3706 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3707 3708 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3709 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3710 3711 if (lq_sta->pers.dbg_fixed_rate) { 3712 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3713 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq); 3714 } 3715 } 3716 3717 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3718 const char __user *user_buf, size_t count, loff_t *ppos) 3719 { 3720 struct iwl_lq_sta *lq_sta = file->private_data; 3721 struct iwl_mvm *mvm; 3722 char buf[64]; 3723 size_t buf_size; 3724 u32 parsed_rate; 3725 3726 mvm = lq_sta->pers.drv; 3727 memset(buf, 0, sizeof(buf)); 3728 buf_size = min(count, sizeof(buf) - 1); 3729 if (copy_from_user(buf, user_buf, buf_size)) 3730 return -EFAULT; 3731 3732 if (sscanf(buf, "%x", &parsed_rate) == 1) 3733 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3734 else 3735 lq_sta->pers.dbg_fixed_rate = 0; 3736 3737 rs_program_fix_rate(mvm, lq_sta); 3738 3739 return count; 3740 } 3741 3742 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3743 char __user *user_buf, size_t count, loff_t *ppos) 3744 { 3745 char *buff; 3746 int desc = 0; 3747 int i = 0; 3748 ssize_t ret; 3749 static const size_t bufsz = 2048; 3750 3751 struct iwl_lq_sta *lq_sta = file->private_data; 3752 struct iwl_mvm_sta *mvmsta = 3753 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3754 struct iwl_mvm *mvm; 3755 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3756 struct rs_rate *rate = &tbl->rate; 3757 u32 ss_params; 3758 3759 mvm = lq_sta->pers.drv; 3760 buff = kmalloc(bufsz, GFP_KERNEL); 3761 if (!buff) 3762 return -ENOMEM; 3763 3764 desc += scnprintf(buff + desc, bufsz - desc, 3765 "sta_id %d\n", lq_sta->lq.sta_id); 3766 desc += scnprintf(buff + desc, bufsz - desc, 3767 "failed=%d success=%d rate=0%lX\n", 3768 lq_sta->total_failed, lq_sta->total_success, 3769 lq_sta->active_legacy_rate); 3770 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3771 lq_sta->pers.dbg_fixed_rate); 3772 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n", 3773 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3774 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : ""); 3775 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3776 (is_legacy(rate)) ? "legacy" : 3777 is_vht(rate) ? "VHT" : "HT"); 3778 if (!is_legacy(rate)) { 3779 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3780 (is_siso(rate)) ? "SISO" : "MIMO2"); 3781 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3782 (is_ht20(rate)) ? "20MHz" : 3783 (is_ht40(rate)) ? "40MHz" : 3784 (is_ht80(rate)) ? "80MHz" : 3785 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3786 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3787 (rate->sgi) ? "SGI" : "NGI", 3788 (rate->ldpc) ? "LDPC" : "BCC", 3789 (lq_sta->is_agg) ? "AGG on" : "", 3790 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3791 } 3792 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3793 lq_sta->last_rate_n_flags); 3794 desc += scnprintf(buff + desc, bufsz - desc, 3795 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3796 lq_sta->lq.flags, 3797 lq_sta->lq.mimo_delim, 3798 lq_sta->lq.single_stream_ant_msk, 3799 lq_sta->lq.dual_stream_ant_msk); 3800 3801 desc += scnprintf(buff + desc, bufsz - desc, 3802 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3803 le16_to_cpu(lq_sta->lq.agg_time_limit), 3804 lq_sta->lq.agg_disable_start_th, 3805 lq_sta->lq.agg_frame_cnt_limit); 3806 3807 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3808 lq_sta->lq.reduced_tpc); 3809 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3810 desc += scnprintf(buff + desc, bufsz - desc, 3811 "single stream params: %s%s%s%s\n", 3812 (ss_params & LQ_SS_PARAMS_VALID) ? 3813 "VALID" : "INVALID", 3814 (ss_params & LQ_SS_BFER_ALLOWED) ? 3815 ", BFER" : "", 3816 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3817 ", STBC" : "", 3818 (ss_params & LQ_SS_FORCE) ? 3819 ", FORCE" : ""); 3820 desc += scnprintf(buff + desc, bufsz - desc, 3821 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3822 lq_sta->lq.initial_rate_index[0], 3823 lq_sta->lq.initial_rate_index[1], 3824 lq_sta->lq.initial_rate_index[2], 3825 lq_sta->lq.initial_rate_index[3]); 3826 3827 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3828 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3829 3830 desc += scnprintf(buff + desc, bufsz - desc, 3831 " rate[%d] 0x%X ", i, r); 3832 desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r); 3833 if (desc < bufsz - 1) 3834 buff[desc++] = '\n'; 3835 } 3836 3837 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3838 kfree(buff); 3839 return ret; 3840 } 3841 3842 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3843 .write = rs_sta_dbgfs_scale_table_write, 3844 .read = rs_sta_dbgfs_scale_table_read, 3845 .open = simple_open, 3846 .llseek = default_llseek, 3847 }; 3848 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3849 char __user *user_buf, size_t count, loff_t *ppos) 3850 { 3851 char *buff; 3852 int desc = 0; 3853 int i, j; 3854 ssize_t ret; 3855 struct iwl_scale_tbl_info *tbl; 3856 struct rs_rate *rate; 3857 struct iwl_lq_sta *lq_sta = file->private_data; 3858 3859 buff = kmalloc(1024, GFP_KERNEL); 3860 if (!buff) 3861 return -ENOMEM; 3862 3863 for (i = 0; i < LQ_SIZE; i++) { 3864 tbl = &(lq_sta->lq_info[i]); 3865 rate = &tbl->rate; 3866 desc += sprintf(buff+desc, 3867 "%s type=%d SGI=%d BW=%s DUP=0\n" 3868 "index=%d\n", 3869 lq_sta->active_tbl == i ? "*" : "x", 3870 rate->type, 3871 rate->sgi, 3872 is_ht20(rate) ? "20MHz" : 3873 is_ht40(rate) ? "40MHz" : 3874 is_ht80(rate) ? "80MHz" : 3875 is_ht160(rate) ? "160MHz" : "ERR", 3876 rate->index); 3877 for (j = 0; j < IWL_RATE_COUNT; j++) { 3878 desc += sprintf(buff+desc, 3879 "counter=%d success=%d %%=%d\n", 3880 tbl->win[j].counter, 3881 tbl->win[j].success_counter, 3882 tbl->win[j].success_ratio); 3883 } 3884 } 3885 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3886 kfree(buff); 3887 return ret; 3888 } 3889 3890 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3891 .read = rs_sta_dbgfs_stats_table_read, 3892 .open = simple_open, 3893 .llseek = default_llseek, 3894 }; 3895 3896 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3897 char __user *user_buf, 3898 size_t count, loff_t *ppos) 3899 { 3900 static const char * const column_name[] = { 3901 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3902 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3903 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3904 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3905 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3906 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3907 [RS_COLUMN_MIMO2] = "MIMO2", 3908 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3909 }; 3910 3911 static const char * const rate_name[] = { 3912 [IWL_RATE_1M_INDEX] = "1M", 3913 [IWL_RATE_2M_INDEX] = "2M", 3914 [IWL_RATE_5M_INDEX] = "5.5M", 3915 [IWL_RATE_11M_INDEX] = "11M", 3916 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3917 [IWL_RATE_9M_INDEX] = "9M", 3918 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3919 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3920 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3921 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3922 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3923 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3924 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3925 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3926 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3927 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3928 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3929 }; 3930 3931 char *buff, *pos, *endpos; 3932 int col, rate; 3933 ssize_t ret; 3934 struct iwl_lq_sta *lq_sta = file->private_data; 3935 struct rs_rate_stats *stats; 3936 static const size_t bufsz = 1024; 3937 3938 buff = kmalloc(bufsz, GFP_KERNEL); 3939 if (!buff) 3940 return -ENOMEM; 3941 3942 pos = buff; 3943 endpos = pos + bufsz; 3944 3945 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3946 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3947 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3948 pos += scnprintf(pos, endpos - pos, "\n"); 3949 3950 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3951 pos += scnprintf(pos, endpos - pos, 3952 "%s,", column_name[col]); 3953 3954 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3955 stats = &(lq_sta->pers.tx_stats[col][rate]); 3956 pos += scnprintf(pos, endpos - pos, 3957 "%llu/%llu,", 3958 stats->success, 3959 stats->total); 3960 } 3961 pos += scnprintf(pos, endpos - pos, "\n"); 3962 } 3963 3964 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3965 kfree(buff); 3966 return ret; 3967 } 3968 3969 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3970 const char __user *user_buf, 3971 size_t count, loff_t *ppos) 3972 { 3973 struct iwl_lq_sta *lq_sta = file->private_data; 3974 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3975 3976 return count; 3977 } 3978 3979 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3980 .read = rs_sta_dbgfs_drv_tx_stats_read, 3981 .write = rs_sta_dbgfs_drv_tx_stats_write, 3982 .open = simple_open, 3983 .llseek = default_llseek, 3984 }; 3985 3986 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3987 char __user *user_buf, 3988 size_t count, loff_t *ppos) 3989 { 3990 struct iwl_lq_sta *lq_sta = file->private_data; 3991 char buf[12]; 3992 int bufsz = sizeof(buf); 3993 int pos = 0; 3994 static const char * const ss_force_name[] = { 3995 [RS_SS_FORCE_NONE] = "none", 3996 [RS_SS_FORCE_STBC] = "stbc", 3997 [RS_SS_FORCE_BFER] = "bfer", 3998 [RS_SS_FORCE_SISO] = "siso", 3999 }; 4000 4001 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4002 ss_force_name[lq_sta->pers.ss_force]); 4003 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4004 } 4005 4006 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4007 size_t count, loff_t *ppos) 4008 { 4009 struct iwl_mvm *mvm = lq_sta->pers.drv; 4010 int ret = 0; 4011 4012 if (!strncmp("none", buf, 4)) { 4013 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4014 } else if (!strncmp("siso", buf, 4)) { 4015 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4016 } else if (!strncmp("stbc", buf, 4)) { 4017 if (lq_sta->stbc_capable) { 4018 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4019 } else { 4020 IWL_ERR(mvm, 4021 "can't force STBC. peer doesn't support\n"); 4022 ret = -EINVAL; 4023 } 4024 } else if (!strncmp("bfer", buf, 4)) { 4025 if (lq_sta->bfer_capable) { 4026 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4027 } else { 4028 IWL_ERR(mvm, 4029 "can't force BFER. peer doesn't support\n"); 4030 ret = -EINVAL; 4031 } 4032 } else { 4033 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4034 ret = -EINVAL; 4035 } 4036 return ret ?: count; 4037 } 4038 4039 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4040 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4041 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4042 debugfs_create_file(#name, mode, parent, lq_sta, \ 4043 &iwl_dbgfs_##name##_ops); \ 4044 } while (0) 4045 4046 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4047 4048 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4049 struct dentry *dir) 4050 { 4051 struct iwl_lq_sta *lq_sta = priv_sta; 4052 struct iwl_mvm_sta *mvmsta; 4053 4054 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4055 4056 if (!mvmsta->vif) 4057 return; 4058 4059 debugfs_create_file("rate_scale_table", 0600, dir, 4060 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4061 debugfs_create_file("rate_stats_table", 0400, dir, 4062 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4063 debugfs_create_file("drv_tx_stats", 0600, dir, 4064 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4065 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4066 &lq_sta->tx_agg_tid_en); 4067 debugfs_create_u8("reduced_tpc", 0600, dir, 4068 &lq_sta->pers.dbg_fixed_txp_reduction); 4069 4070 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4071 } 4072 #endif 4073 4074 /* 4075 * Initialization of rate scaling information is done by driver after 4076 * the station is added. Since mac80211 calls this function before a 4077 * station is added we ignore it. 4078 */ 4079 static void rs_rate_init_ops(void *mvm_r, 4080 struct ieee80211_supported_band *sband, 4081 struct cfg80211_chan_def *chandef, 4082 struct ieee80211_sta *sta, void *mvm_sta) 4083 { 4084 } 4085 4086 /* ops for rate scaling implemented in the driver */ 4087 static const struct rate_control_ops rs_mvm_ops_drv = { 4088 .name = RS_NAME, 4089 .tx_status = rs_drv_mac80211_tx_status, 4090 .get_rate = rs_drv_get_rate, 4091 .rate_init = rs_rate_init_ops, 4092 .alloc = rs_alloc, 4093 .free = rs_free, 4094 .alloc_sta = rs_drv_alloc_sta, 4095 .free_sta = rs_free_sta, 4096 .rate_update = rs_drv_rate_update, 4097 #ifdef CONFIG_MAC80211_DEBUGFS 4098 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4099 #endif 4100 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4101 }; 4102 4103 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4104 enum nl80211_band band, bool update) 4105 { 4106 if (iwl_mvm_has_tlc_offload(mvm)) { 4107 rs_fw_rate_init(mvm, sta, band, update); 4108 } else { 4109 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 4110 4111 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock); 4112 rs_drv_rate_init(mvm, sta, band); 4113 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 4114 } 4115 } 4116 4117 int iwl_mvm_rate_control_register(void) 4118 { 4119 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4120 } 4121 4122 void iwl_mvm_rate_control_unregister(void) 4123 { 4124 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4125 } 4126 4127 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4128 bool enable) 4129 { 4130 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4131 4132 lockdep_assert_held(&mvm->mutex); 4133 4134 if (enable) { 4135 if (mvmsta->tx_protection == 0) 4136 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4137 mvmsta->tx_protection++; 4138 } else { 4139 mvmsta->tx_protection--; 4140 if (mvmsta->tx_protection == 0) 4141 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4142 } 4143 4144 return iwl_mvm_send_lq_cmd(mvm, lq); 4145 } 4146 4147 /** 4148 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4149 * @mvm: The mvm component 4150 * @mvmsta: The station 4151 * @enable: Enable Tx protection? 4152 */ 4153 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4154 bool enable) 4155 { 4156 if (iwl_mvm_has_tlc_offload(mvm)) 4157 return rs_fw_tx_protection(mvm, mvmsta, enable); 4158 else 4159 return rs_drv_tx_protection(mvm, mvmsta, enable); 4160 } 4161