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