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