1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 6 * Copyright(c) 2018 Intel Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of version 2 of the GNU General Public License as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * The full GNU General Public License is included in this distribution in the 18 * file called LICENSE. 19 * 20 * Contact Information: 21 * Intel Linux Wireless <linuxwifi@intel.com> 22 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 23 * 24 *****************************************************************************/ 25 #include <linux/kernel.h> 26 #include <linux/skbuff.h> 27 #include <linux/slab.h> 28 #include <net/mac80211.h> 29 30 #include <linux/netdevice.h> 31 #include <linux/etherdevice.h> 32 #include <linux/delay.h> 33 34 #include <linux/workqueue.h> 35 #include "rs.h" 36 #include "fw-api.h" 37 #include "sta.h" 38 #include "iwl-op-mode.h" 39 #include "mvm.h" 40 #include "debugfs.h" 41 42 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 43 44 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 45 * Use this macro when dealing with thresholds consts set as a percentage 46 */ 47 #define RS_PERCENT(x) (128 * x) 48 49 static u8 rs_ht_to_legacy[] = { 50 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 51 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 52 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 53 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 54 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 55 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 56 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 57 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 58 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 59 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 60 }; 61 62 static const u8 ant_toggle_lookup[] = { 63 [ANT_NONE] = ANT_NONE, 64 [ANT_A] = ANT_B, 65 [ANT_B] = ANT_A, 66 [ANT_AB] = ANT_AB, 67 }; 68 69 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 70 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 71 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 72 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 73 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 74 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 75 IWL_RATE_##rp##M_INDEX, \ 76 IWL_RATE_##rn##M_INDEX } 77 78 #define IWL_DECLARE_MCS_RATE(s) \ 79 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 84 IWL_RATE_INVM_INDEX, \ 85 IWL_RATE_INVM_INDEX } 86 87 /* 88 * Parameter order: 89 * rate, ht rate, prev rate, next rate 90 * 91 * If there isn't a valid next or previous rate then INV is used which 92 * maps to IWL_RATE_INVALID 93 * 94 */ 95 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 96 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 97 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 98 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 99 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 100 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 101 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 102 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 103 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 104 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 105 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 106 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 107 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 108 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 109 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 110 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 111 }; 112 113 enum rs_action { 114 RS_ACTION_STAY = 0, 115 RS_ACTION_DOWNSCALE = -1, 116 RS_ACTION_UPSCALE = 1, 117 }; 118 119 enum rs_column_mode { 120 RS_INVALID = 0, 121 RS_LEGACY, 122 RS_SISO, 123 RS_MIMO2, 124 }; 125 126 #define MAX_NEXT_COLUMNS 7 127 #define MAX_COLUMN_CHECKS 3 128 129 struct rs_tx_column; 130 131 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 132 struct ieee80211_sta *sta, 133 struct rs_rate *rate, 134 const struct rs_tx_column *next_col); 135 136 struct rs_tx_column { 137 enum rs_column_mode mode; 138 u8 ant; 139 bool sgi; 140 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 141 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 142 }; 143 144 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 145 struct rs_rate *rate, 146 const struct rs_tx_column *next_col) 147 { 148 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 149 } 150 151 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 152 struct rs_rate *rate, 153 const struct rs_tx_column *next_col) 154 { 155 if (!sta->ht_cap.ht_supported) 156 return false; 157 158 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 159 return false; 160 161 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 162 return false; 163 164 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 165 return false; 166 167 if (mvm->nvm_data->sku_cap_mimo_disabled) 168 return false; 169 170 return true; 171 } 172 173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 174 struct rs_rate *rate, 175 const struct rs_tx_column *next_col) 176 { 177 if (!sta->ht_cap.ht_supported) 178 return false; 179 180 return true; 181 } 182 183 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 184 struct rs_rate *rate, 185 const struct rs_tx_column *next_col) 186 { 187 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 188 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 189 190 if (is_ht20(rate) && (ht_cap->cap & 191 IEEE80211_HT_CAP_SGI_20)) 192 return true; 193 if (is_ht40(rate) && (ht_cap->cap & 194 IEEE80211_HT_CAP_SGI_40)) 195 return true; 196 if (is_ht80(rate) && (vht_cap->cap & 197 IEEE80211_VHT_CAP_SHORT_GI_80)) 198 return true; 199 if (is_ht160(rate) && (vht_cap->cap & 200 IEEE80211_VHT_CAP_SHORT_GI_160)) 201 return true; 202 203 return false; 204 } 205 206 static const struct rs_tx_column rs_tx_columns[] = { 207 [RS_COLUMN_LEGACY_ANT_A] = { 208 .mode = RS_LEGACY, 209 .ant = ANT_A, 210 .next_columns = { 211 RS_COLUMN_LEGACY_ANT_B, 212 RS_COLUMN_SISO_ANT_A, 213 RS_COLUMN_MIMO2, 214 RS_COLUMN_INVALID, 215 RS_COLUMN_INVALID, 216 RS_COLUMN_INVALID, 217 RS_COLUMN_INVALID, 218 }, 219 .checks = { 220 rs_ant_allow, 221 }, 222 }, 223 [RS_COLUMN_LEGACY_ANT_B] = { 224 .mode = RS_LEGACY, 225 .ant = ANT_B, 226 .next_columns = { 227 RS_COLUMN_LEGACY_ANT_A, 228 RS_COLUMN_SISO_ANT_B, 229 RS_COLUMN_MIMO2, 230 RS_COLUMN_INVALID, 231 RS_COLUMN_INVALID, 232 RS_COLUMN_INVALID, 233 RS_COLUMN_INVALID, 234 }, 235 .checks = { 236 rs_ant_allow, 237 }, 238 }, 239 [RS_COLUMN_SISO_ANT_A] = { 240 .mode = RS_SISO, 241 .ant = ANT_A, 242 .next_columns = { 243 RS_COLUMN_SISO_ANT_B, 244 RS_COLUMN_MIMO2, 245 RS_COLUMN_SISO_ANT_A_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_B] = { 257 .mode = RS_SISO, 258 .ant = ANT_B, 259 .next_columns = { 260 RS_COLUMN_SISO_ANT_A, 261 RS_COLUMN_MIMO2, 262 RS_COLUMN_SISO_ANT_B_SGI, 263 RS_COLUMN_LEGACY_ANT_A, 264 RS_COLUMN_LEGACY_ANT_B, 265 RS_COLUMN_INVALID, 266 RS_COLUMN_INVALID, 267 }, 268 .checks = { 269 rs_siso_allow, 270 rs_ant_allow, 271 }, 272 }, 273 [RS_COLUMN_SISO_ANT_A_SGI] = { 274 .mode = RS_SISO, 275 .ant = ANT_A, 276 .sgi = true, 277 .next_columns = { 278 RS_COLUMN_SISO_ANT_B_SGI, 279 RS_COLUMN_MIMO2_SGI, 280 RS_COLUMN_SISO_ANT_A, 281 RS_COLUMN_LEGACY_ANT_A, 282 RS_COLUMN_LEGACY_ANT_B, 283 RS_COLUMN_INVALID, 284 RS_COLUMN_INVALID, 285 }, 286 .checks = { 287 rs_siso_allow, 288 rs_ant_allow, 289 rs_sgi_allow, 290 }, 291 }, 292 [RS_COLUMN_SISO_ANT_B_SGI] = { 293 .mode = RS_SISO, 294 .ant = ANT_B, 295 .sgi = true, 296 .next_columns = { 297 RS_COLUMN_SISO_ANT_A_SGI, 298 RS_COLUMN_MIMO2_SGI, 299 RS_COLUMN_SISO_ANT_B, 300 RS_COLUMN_LEGACY_ANT_A, 301 RS_COLUMN_LEGACY_ANT_B, 302 RS_COLUMN_INVALID, 303 RS_COLUMN_INVALID, 304 }, 305 .checks = { 306 rs_siso_allow, 307 rs_ant_allow, 308 rs_sgi_allow, 309 }, 310 }, 311 [RS_COLUMN_MIMO2] = { 312 .mode = RS_MIMO2, 313 .ant = ANT_AB, 314 .next_columns = { 315 RS_COLUMN_SISO_ANT_A, 316 RS_COLUMN_MIMO2_SGI, 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 }, 326 }, 327 [RS_COLUMN_MIMO2_SGI] = { 328 .mode = RS_MIMO2, 329 .ant = ANT_AB, 330 .sgi = true, 331 .next_columns = { 332 RS_COLUMN_SISO_ANT_A_SGI, 333 RS_COLUMN_MIMO2, 334 RS_COLUMN_LEGACY_ANT_A, 335 RS_COLUMN_LEGACY_ANT_B, 336 RS_COLUMN_INVALID, 337 RS_COLUMN_INVALID, 338 RS_COLUMN_INVALID, 339 }, 340 .checks = { 341 rs_mimo_allow, 342 rs_sgi_allow, 343 }, 344 }, 345 }; 346 347 static inline u8 rs_extract_rate(u32 rate_n_flags) 348 { 349 /* also works for HT because bits 7:6 are zero there */ 350 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 351 } 352 353 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 354 { 355 int idx = 0; 356 357 if (rate_n_flags & RATE_MCS_HT_MSK) { 358 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 359 idx += IWL_RATE_MCS_0_INDEX; 360 361 /* skip 9M not supported in HT*/ 362 if (idx >= IWL_RATE_9M_INDEX) 363 idx += 1; 364 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 365 return idx; 366 } else if (rate_n_flags & RATE_MCS_VHT_MSK || 367 rate_n_flags & RATE_MCS_HE_MSK) { 368 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 369 idx += IWL_RATE_MCS_0_INDEX; 370 371 /* skip 9M not supported in VHT*/ 372 if (idx >= IWL_RATE_9M_INDEX) 373 idx++; 374 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 375 return idx; 376 if ((rate_n_flags & RATE_MCS_HE_MSK) && 377 (idx <= IWL_LAST_HE_RATE)) 378 return idx; 379 } else { 380 /* legacy rate format, search for match in table */ 381 382 u8 legacy_rate = rs_extract_rate(rate_n_flags); 383 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 384 if (iwl_rates[idx].plcp == legacy_rate) 385 return idx; 386 } 387 388 return IWL_RATE_INVALID; 389 } 390 391 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 392 struct ieee80211_sta *sta, 393 struct iwl_lq_sta *lq_sta, 394 int tid, bool ndp); 395 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 396 struct ieee80211_sta *sta, 397 struct iwl_lq_sta *lq_sta, 398 const struct rs_rate *initial_rate); 399 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 400 401 /** 402 * The following tables contain the expected throughput metrics for all rates 403 * 404 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 405 * 406 * where invalid entries are zeros. 407 * 408 * CCK rates are only valid in legacy table and will only be used in G 409 * (2.4 GHz) band. 410 */ 411 412 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 413 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 414 }; 415 416 /* Expected TpT tables. 4 indexes: 417 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 418 */ 419 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 420 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 421 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 422 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 423 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 424 }; 425 426 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 427 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 428 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 429 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 430 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 431 }; 432 433 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 434 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 435 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 436 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 437 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 438 }; 439 440 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 441 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 442 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 443 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 444 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 445 }; 446 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 448 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 449 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 450 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 451 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 452 }; 453 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 455 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 456 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 457 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 458 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 459 }; 460 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 462 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 463 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 464 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 465 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 466 }; 467 468 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 469 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 470 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 471 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 472 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 473 }; 474 475 /* mbps, mcs */ 476 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 477 { "1", "BPSK DSSS"}, 478 { "2", "QPSK DSSS"}, 479 {"5.5", "BPSK CCK"}, 480 { "11", "QPSK CCK"}, 481 { "6", "BPSK 1/2"}, 482 { "9", "BPSK 1/2"}, 483 { "12", "QPSK 1/2"}, 484 { "18", "QPSK 3/4"}, 485 { "24", "16QAM 1/2"}, 486 { "36", "16QAM 3/4"}, 487 { "48", "64QAM 2/3"}, 488 { "54", "64QAM 3/4"}, 489 { "60", "64QAM 5/6"}, 490 }; 491 492 #define MCS_INDEX_PER_STREAM (8) 493 494 static const char *rs_pretty_ant(u8 ant) 495 { 496 static const char * const ant_name[] = { 497 [ANT_NONE] = "None", 498 [ANT_A] = "A", 499 [ANT_B] = "B", 500 [ANT_AB] = "AB", 501 [ANT_C] = "C", 502 [ANT_AC] = "AC", 503 [ANT_BC] = "BC", 504 [ANT_ABC] = "ABC", 505 }; 506 507 if (ant > ANT_ABC) 508 return "UNKNOWN"; 509 510 return ant_name[ant]; 511 } 512 513 static const char *rs_pretty_lq_type(enum iwl_table_type type) 514 { 515 static const char * const lq_types[] = { 516 [LQ_NONE] = "NONE", 517 [LQ_LEGACY_A] = "LEGACY_A", 518 [LQ_LEGACY_G] = "LEGACY_G", 519 [LQ_HT_SISO] = "HT SISO", 520 [LQ_HT_MIMO2] = "HT MIMO", 521 [LQ_VHT_SISO] = "VHT SISO", 522 [LQ_VHT_MIMO2] = "VHT MIMO", 523 [LQ_HE_SISO] = "HE SISO", 524 [LQ_HE_MIMO2] = "HE MIMO", 525 }; 526 527 if (type < LQ_NONE || type >= LQ_MAX) 528 return "UNKNOWN"; 529 530 return lq_types[type]; 531 } 532 533 static char *rs_pretty_rate(const struct rs_rate *rate) 534 { 535 static char buf[40]; 536 static const char * const legacy_rates[] = { 537 [IWL_RATE_1M_INDEX] = "1M", 538 [IWL_RATE_2M_INDEX] = "2M", 539 [IWL_RATE_5M_INDEX] = "5.5M", 540 [IWL_RATE_11M_INDEX] = "11M", 541 [IWL_RATE_6M_INDEX] = "6M", 542 [IWL_RATE_9M_INDEX] = "9M", 543 [IWL_RATE_12M_INDEX] = "12M", 544 [IWL_RATE_18M_INDEX] = "18M", 545 [IWL_RATE_24M_INDEX] = "24M", 546 [IWL_RATE_36M_INDEX] = "36M", 547 [IWL_RATE_48M_INDEX] = "48M", 548 [IWL_RATE_54M_INDEX] = "54M", 549 }; 550 static const char *const ht_vht_rates[] = { 551 [IWL_RATE_MCS_0_INDEX] = "MCS0", 552 [IWL_RATE_MCS_1_INDEX] = "MCS1", 553 [IWL_RATE_MCS_2_INDEX] = "MCS2", 554 [IWL_RATE_MCS_3_INDEX] = "MCS3", 555 [IWL_RATE_MCS_4_INDEX] = "MCS4", 556 [IWL_RATE_MCS_5_INDEX] = "MCS5", 557 [IWL_RATE_MCS_6_INDEX] = "MCS6", 558 [IWL_RATE_MCS_7_INDEX] = "MCS7", 559 [IWL_RATE_MCS_8_INDEX] = "MCS8", 560 [IWL_RATE_MCS_9_INDEX] = "MCS9", 561 }; 562 const char *rate_str; 563 564 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 565 rate_str = legacy_rates[rate->index]; 566 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 567 (rate->index >= IWL_RATE_MCS_0_INDEX) && 568 (rate->index <= IWL_RATE_MCS_9_INDEX)) 569 rate_str = ht_vht_rates[rate->index]; 570 else 571 rate_str = "BAD_RATE"; 572 573 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 574 rs_pretty_ant(rate->ant), rate_str); 575 return buf; 576 } 577 578 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 579 const char *prefix) 580 { 581 IWL_DEBUG_RATE(mvm, 582 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 583 prefix, rs_pretty_rate(rate), rate->bw, 584 rate->sgi, rate->ldpc, rate->stbc); 585 } 586 587 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 588 { 589 window->data = 0; 590 window->success_counter = 0; 591 window->success_ratio = IWL_INVALID_VALUE; 592 window->counter = 0; 593 window->average_tpt = IWL_INVALID_VALUE; 594 } 595 596 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 597 struct iwl_scale_tbl_info *tbl) 598 { 599 int i; 600 601 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 602 for (i = 0; i < IWL_RATE_COUNT; i++) 603 rs_rate_scale_clear_window(&tbl->win[i]); 604 605 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 606 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 607 } 608 609 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 610 { 611 return (ant_type & valid_antenna) == ant_type; 612 } 613 614 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 615 struct iwl_lq_sta *lq_data, u8 tid, 616 struct ieee80211_sta *sta) 617 { 618 int ret = -EAGAIN; 619 620 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 621 sta->addr, tid); 622 623 /* start BA session until the peer sends del BA */ 624 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 625 if (ret == -EAGAIN) { 626 /* 627 * driver and mac80211 is out of sync 628 * this might be cause by reloading firmware 629 * stop the tx ba session here 630 */ 631 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 632 tid); 633 ieee80211_stop_tx_ba_session(sta, tid); 634 } 635 return ret; 636 } 637 638 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 639 u8 tid, struct iwl_lq_sta *lq_sta, 640 struct ieee80211_sta *sta) 641 { 642 struct iwl_mvm_tid_data *tid_data; 643 644 /* 645 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 646 * when the frame is not QoS 647 */ 648 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 649 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 650 tid, IWL_MAX_TID_COUNT); 651 return; 652 } else if (tid == IWL_MAX_TID_COUNT) { 653 return; 654 } 655 656 tid_data = &mvmsta->tid_data[tid]; 657 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 658 tid_data->state == IWL_AGG_OFF && 659 (lq_sta->tx_agg_tid_en & BIT(tid)) && 660 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 661 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 662 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 663 tid_data->state = IWL_AGG_QUEUED; 664 } 665 } 666 667 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 668 { 669 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 670 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 671 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 672 } 673 674 /* 675 * Static function to get the expected throughput from an iwl_scale_tbl_info 676 * that wraps a NULL pointer check 677 */ 678 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 679 { 680 if (tbl->expected_tpt) 681 return tbl->expected_tpt[rs_index]; 682 return 0; 683 } 684 685 /** 686 * rs_collect_tx_data - Update the success/failure sliding window 687 * 688 * We keep a sliding window of the last 62 packets transmitted 689 * at this rate. window->data contains the bitmask of successful 690 * packets. 691 */ 692 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 693 struct iwl_scale_tbl_info *tbl, 694 int scale_index, int attempts, int successes, 695 struct iwl_rate_scale_data *window) 696 { 697 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 698 s32 fail_count, tpt; 699 700 /* Get expected throughput */ 701 tpt = get_expected_tpt(tbl, scale_index); 702 703 /* 704 * Keep track of only the latest 62 tx frame attempts in this rate's 705 * history window; anything older isn't really relevant any more. 706 * If we have filled up the sliding window, drop the oldest attempt; 707 * if the oldest attempt (highest bit in bitmap) shows "success", 708 * subtract "1" from the success counter (this is the main reason 709 * we keep these bitmaps!). 710 */ 711 while (attempts > 0) { 712 if (window->counter >= IWL_RATE_MAX_WINDOW) { 713 /* remove earliest */ 714 window->counter = IWL_RATE_MAX_WINDOW - 1; 715 716 if (window->data & mask) { 717 window->data &= ~mask; 718 window->success_counter--; 719 } 720 } 721 722 /* Increment frames-attempted counter */ 723 window->counter++; 724 725 /* Shift bitmap by one frame to throw away oldest history */ 726 window->data <<= 1; 727 728 /* Mark the most recent #successes attempts as successful */ 729 if (successes > 0) { 730 window->success_counter++; 731 window->data |= 0x1; 732 successes--; 733 } 734 735 attempts--; 736 } 737 738 /* Calculate current success ratio, avoid divide-by-0! */ 739 if (window->counter > 0) 740 window->success_ratio = 128 * (100 * window->success_counter) 741 / window->counter; 742 else 743 window->success_ratio = IWL_INVALID_VALUE; 744 745 fail_count = window->counter - window->success_counter; 746 747 /* Calculate average throughput, if we have enough history. */ 748 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 749 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 750 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 751 else 752 window->average_tpt = IWL_INVALID_VALUE; 753 754 return 0; 755 } 756 757 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 758 struct iwl_lq_sta *lq_sta, 759 struct iwl_scale_tbl_info *tbl, 760 int scale_index, int attempts, int successes, 761 u8 reduced_txp) 762 { 763 struct iwl_rate_scale_data *window = NULL; 764 765 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 766 return -EINVAL; 767 768 window = &tbl->tpc_win[reduced_txp]; 769 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 770 window); 771 } 772 773 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 774 struct iwl_mvm_sta *mvmsta, 775 u8 tid, int successes) 776 { 777 struct iwl_mvm_tid_data *tid_data; 778 779 if (tid >= IWL_MAX_TID_COUNT) 780 return; 781 782 tid_data = &mvmsta->tid_data[tid]; 783 784 /* 785 * Measure if there're enough successful transmits per second. 786 * These statistics are used only to decide if we can start a 787 * BA session, so it should be updated only when A-MPDU is 788 * off. 789 */ 790 if (tid_data->state != IWL_AGG_OFF) 791 return; 792 793 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 794 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 795 tid_data->tx_count_last = tid_data->tx_count; 796 tid_data->tx_count = 0; 797 tid_data->tpt_meas_start = jiffies; 798 } else { 799 tid_data->tx_count += successes; 800 } 801 } 802 803 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 804 struct iwl_mvm_sta *mvmsta, u8 tid, 805 struct iwl_scale_tbl_info *tbl, 806 int scale_index, int attempts, int successes) 807 { 808 struct iwl_rate_scale_data *window = NULL; 809 810 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 811 return -EINVAL; 812 813 if (tbl->column != RS_COLUMN_INVALID) { 814 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 815 816 pers->tx_stats[tbl->column][scale_index].total += attempts; 817 pers->tx_stats[tbl->column][scale_index].success += successes; 818 } 819 820 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 821 822 /* Select window for current tx bit rate */ 823 window = &(tbl->win[scale_index]); 824 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 825 window); 826 } 827 828 /* Convert rs_rate object into ucode rate bitmask */ 829 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 830 struct rs_rate *rate) 831 { 832 u32 ucode_rate = 0; 833 int index = rate->index; 834 835 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 836 RATE_MCS_ANT_ABC_MSK); 837 838 if (is_legacy(rate)) { 839 ucode_rate |= iwl_rates[index].plcp; 840 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 841 ucode_rate |= RATE_MCS_CCK_MSK; 842 return ucode_rate; 843 } 844 845 if (is_ht(rate)) { 846 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 847 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 848 index = IWL_LAST_HT_RATE; 849 } 850 ucode_rate |= RATE_MCS_HT_MSK; 851 852 if (is_ht_siso(rate)) 853 ucode_rate |= iwl_rates[index].plcp_ht_siso; 854 else if (is_ht_mimo2(rate)) 855 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 856 else 857 WARN_ON_ONCE(1); 858 } else if (is_vht(rate)) { 859 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 860 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 861 index = IWL_LAST_VHT_RATE; 862 } 863 ucode_rate |= RATE_MCS_VHT_MSK; 864 if (is_vht_siso(rate)) 865 ucode_rate |= iwl_rates[index].plcp_vht_siso; 866 else if (is_vht_mimo2(rate)) 867 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 868 else 869 WARN_ON_ONCE(1); 870 871 } else { 872 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 873 } 874 875 if (is_siso(rate) && rate->stbc) { 876 /* To enable STBC we need to set both a flag and ANT_AB */ 877 ucode_rate |= RATE_MCS_ANT_AB_MSK; 878 ucode_rate |= RATE_MCS_STBC_MSK; 879 } 880 881 ucode_rate |= rate->bw; 882 if (rate->sgi) 883 ucode_rate |= RATE_MCS_SGI_MSK; 884 if (rate->ldpc) 885 ucode_rate |= RATE_MCS_LDPC_MSK; 886 887 return ucode_rate; 888 } 889 890 /* Convert a ucode rate into an rs_rate object */ 891 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 892 enum nl80211_band band, 893 struct rs_rate *rate) 894 { 895 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 896 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 897 u8 nss; 898 899 memset(rate, 0, sizeof(*rate)); 900 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 901 902 if (rate->index == IWL_RATE_INVALID) 903 return -EINVAL; 904 905 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 906 907 /* Legacy */ 908 if (!(ucode_rate & RATE_MCS_HT_MSK) && 909 !(ucode_rate & RATE_MCS_VHT_MSK) && 910 !(ucode_rate & RATE_MCS_HE_MSK)) { 911 if (num_of_ant == 1) { 912 if (band == NL80211_BAND_5GHZ) 913 rate->type = LQ_LEGACY_A; 914 else 915 rate->type = LQ_LEGACY_G; 916 } 917 918 return 0; 919 } 920 921 /* HT, VHT or HE */ 922 if (ucode_rate & RATE_MCS_SGI_MSK) 923 rate->sgi = true; 924 if (ucode_rate & RATE_MCS_LDPC_MSK) 925 rate->ldpc = true; 926 if (ucode_rate & RATE_MCS_STBC_MSK) 927 rate->stbc = true; 928 if (ucode_rate & RATE_MCS_BF_MSK) 929 rate->bfer = true; 930 931 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 932 933 if (ucode_rate & RATE_MCS_HT_MSK) { 934 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 935 RATE_HT_MCS_NSS_POS) + 1; 936 937 if (nss == 1) { 938 rate->type = LQ_HT_SISO; 939 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 940 "stbc %d bfer %d", 941 rate->stbc, rate->bfer); 942 } else if (nss == 2) { 943 rate->type = LQ_HT_MIMO2; 944 WARN_ON_ONCE(num_of_ant != 2); 945 } else { 946 WARN_ON_ONCE(1); 947 } 948 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 949 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 950 RATE_VHT_MCS_NSS_POS) + 1; 951 952 if (nss == 1) { 953 rate->type = LQ_VHT_SISO; 954 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 955 "stbc %d bfer %d", 956 rate->stbc, rate->bfer); 957 } else if (nss == 2) { 958 rate->type = LQ_VHT_MIMO2; 959 WARN_ON_ONCE(num_of_ant != 2); 960 } else { 961 WARN_ON_ONCE(1); 962 } 963 } else if (ucode_rate & RATE_MCS_HE_MSK) { 964 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 965 RATE_VHT_MCS_NSS_POS) + 1; 966 967 if (nss == 1) { 968 rate->type = LQ_HE_SISO; 969 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 970 "stbc %d bfer %d", rate->stbc, rate->bfer); 971 } else if (nss == 2) { 972 rate->type = LQ_HE_MIMO2; 973 WARN_ON_ONCE(num_of_ant != 2); 974 } else { 975 WARN_ON_ONCE(1); 976 } 977 } 978 979 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 980 !is_he(rate) && !is_vht(rate)); 981 982 return 0; 983 } 984 985 /* switch to another antenna/antennas and return 1 */ 986 /* if no other valid antenna found, return 0 */ 987 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 988 { 989 u8 new_ant_type; 990 991 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 992 return 0; 993 994 if (!rs_is_valid_ant(valid_ant, rate->ant)) 995 return 0; 996 997 new_ant_type = ant_toggle_lookup[rate->ant]; 998 999 while ((new_ant_type != rate->ant) && 1000 !rs_is_valid_ant(valid_ant, new_ant_type)) 1001 new_ant_type = ant_toggle_lookup[new_ant_type]; 1002 1003 if (new_ant_type == rate->ant) 1004 return 0; 1005 1006 rate->ant = new_ant_type; 1007 1008 return 1; 1009 } 1010 1011 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 1012 struct rs_rate *rate) 1013 { 1014 if (is_legacy(rate)) 1015 return lq_sta->active_legacy_rate; 1016 else if (is_siso(rate)) 1017 return lq_sta->active_siso_rate; 1018 else if (is_mimo2(rate)) 1019 return lq_sta->active_mimo2_rate; 1020 1021 WARN_ON_ONCE(1); 1022 return 0; 1023 } 1024 1025 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1026 int rate_type) 1027 { 1028 u8 high = IWL_RATE_INVALID; 1029 u8 low = IWL_RATE_INVALID; 1030 1031 /* 802.11A or ht walks to the next literal adjacent rate in 1032 * the rate table */ 1033 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1034 int i; 1035 u32 mask; 1036 1037 /* Find the previous rate that is in the rate mask */ 1038 i = index - 1; 1039 if (i >= 0) 1040 mask = BIT(i); 1041 for (; i >= 0; i--, mask >>= 1) { 1042 if (rate_mask & mask) { 1043 low = i; 1044 break; 1045 } 1046 } 1047 1048 /* Find the next rate that is in the rate mask */ 1049 i = index + 1; 1050 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1051 if (rate_mask & mask) { 1052 high = i; 1053 break; 1054 } 1055 } 1056 1057 return (high << 8) | low; 1058 } 1059 1060 low = index; 1061 while (low != IWL_RATE_INVALID) { 1062 low = iwl_rates[low].prev_rs; 1063 if (low == IWL_RATE_INVALID) 1064 break; 1065 if (rate_mask & (1 << low)) 1066 break; 1067 } 1068 1069 high = index; 1070 while (high != IWL_RATE_INVALID) { 1071 high = iwl_rates[high].next_rs; 1072 if (high == IWL_RATE_INVALID) 1073 break; 1074 if (rate_mask & (1 << high)) 1075 break; 1076 } 1077 1078 return (high << 8) | low; 1079 } 1080 1081 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1082 struct rs_rate *rate) 1083 { 1084 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1085 } 1086 1087 /* Get the next supported lower rate in the current column. 1088 * Return true if bottom rate in the current column was reached 1089 */ 1090 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1091 struct rs_rate *rate) 1092 { 1093 u8 low; 1094 u16 high_low; 1095 u16 rate_mask; 1096 struct iwl_mvm *mvm = lq_sta->pers.drv; 1097 1098 rate_mask = rs_get_supported_rates(lq_sta, rate); 1099 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1100 rate->type); 1101 low = high_low & 0xff; 1102 1103 /* Bottom rate of column reached */ 1104 if (low == IWL_RATE_INVALID) 1105 return true; 1106 1107 rate->index = low; 1108 return false; 1109 } 1110 1111 /* Get the next rate to use following a column downgrade */ 1112 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1113 struct rs_rate *rate) 1114 { 1115 struct iwl_mvm *mvm = lq_sta->pers.drv; 1116 1117 if (is_legacy(rate)) { 1118 /* No column to downgrade from Legacy */ 1119 return; 1120 } else if (is_siso(rate)) { 1121 /* Downgrade to Legacy if we were in SISO */ 1122 if (lq_sta->band == NL80211_BAND_5GHZ) 1123 rate->type = LQ_LEGACY_A; 1124 else 1125 rate->type = LQ_LEGACY_G; 1126 1127 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1128 1129 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1130 rate->index > IWL_RATE_MCS_9_INDEX); 1131 1132 rate->index = rs_ht_to_legacy[rate->index]; 1133 rate->ldpc = false; 1134 } else { 1135 /* Downgrade to SISO with same MCS if in MIMO */ 1136 rate->type = is_vht_mimo2(rate) ? 1137 LQ_VHT_SISO : LQ_HT_SISO; 1138 } 1139 1140 if (num_of_ant(rate->ant) > 1) 1141 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1142 1143 /* Relevant in both switching to SISO or Legacy */ 1144 rate->sgi = false; 1145 1146 if (!rs_rate_supported(lq_sta, rate)) 1147 rs_get_lower_rate_in_column(lq_sta, rate); 1148 } 1149 1150 /* Check if both rates share the same column */ 1151 static inline bool rs_rate_column_match(struct rs_rate *a, 1152 struct rs_rate *b) 1153 { 1154 bool ant_match; 1155 1156 if (a->stbc || a->bfer) 1157 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1158 else 1159 ant_match = (a->ant == b->ant); 1160 1161 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1162 && ant_match; 1163 } 1164 1165 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1166 { 1167 if (is_legacy(rate)) { 1168 if (rate->ant == ANT_A) 1169 return RS_COLUMN_LEGACY_ANT_A; 1170 1171 if (rate->ant == ANT_B) 1172 return RS_COLUMN_LEGACY_ANT_B; 1173 1174 goto err; 1175 } 1176 1177 if (is_siso(rate)) { 1178 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1179 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1180 RS_COLUMN_SISO_ANT_A; 1181 1182 if (rate->ant == ANT_B) 1183 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1184 RS_COLUMN_SISO_ANT_B; 1185 1186 goto err; 1187 } 1188 1189 if (is_mimo(rate)) 1190 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1191 1192 err: 1193 return RS_COLUMN_INVALID; 1194 } 1195 1196 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1197 { 1198 u8 tid = IWL_MAX_TID_COUNT; 1199 1200 if (ieee80211_is_data_qos(hdr->frame_control)) { 1201 u8 *qc = ieee80211_get_qos_ctl(hdr); 1202 tid = qc[0] & 0xf; 1203 } 1204 1205 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1206 tid = IWL_MAX_TID_COUNT; 1207 1208 return tid; 1209 } 1210 1211 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1212 int tid, struct ieee80211_tx_info *info, bool ndp) 1213 { 1214 int legacy_success; 1215 int retries; 1216 int i; 1217 struct iwl_lq_cmd *table; 1218 u32 lq_hwrate; 1219 struct rs_rate lq_rate, tx_resp_rate; 1220 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1221 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1222 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1223 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1224 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1225 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1226 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 1227 1228 /* Treat uninitialized rate scaling data same as non-existing. */ 1229 if (!lq_sta) { 1230 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1231 return; 1232 } else if (!lq_sta->pers.drv) { 1233 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1234 return; 1235 } 1236 1237 /* This packet was aggregated but doesn't carry status info */ 1238 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1239 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1240 return; 1241 1242 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 1243 &tx_resp_rate)) { 1244 WARN_ON_ONCE(1); 1245 return; 1246 } 1247 1248 #ifdef CONFIG_MAC80211_DEBUGFS 1249 /* Disable last tx check if we are debugging with fixed rate but 1250 * update tx stats */ 1251 if (lq_sta->pers.dbg_fixed_rate) { 1252 int index = tx_resp_rate.index; 1253 enum rs_column column; 1254 int attempts, success; 1255 1256 column = rs_get_column_from_rate(&tx_resp_rate); 1257 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1258 "Can't map rate 0x%x to column", 1259 tx_resp_hwrate)) 1260 return; 1261 1262 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1263 attempts = info->status.ampdu_len; 1264 success = info->status.ampdu_ack_len; 1265 } else { 1266 attempts = info->status.rates[0].count; 1267 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1268 } 1269 1270 lq_sta->pers.tx_stats[column][index].total += attempts; 1271 lq_sta->pers.tx_stats[column][index].success += success; 1272 1273 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1274 tx_resp_hwrate, success, attempts); 1275 return; 1276 } 1277 #endif 1278 1279 if (time_after(jiffies, 1280 (unsigned long)(lq_sta->last_tx + 1281 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1282 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1283 iwl_mvm_rs_rate_init(mvm, sta, info->band, true); 1284 return; 1285 } 1286 lq_sta->last_tx = jiffies; 1287 1288 /* Ignore this Tx frame response if its initial rate doesn't match 1289 * that of latest Link Quality command. There may be stragglers 1290 * from a previous Link Quality command, but we're no longer interested 1291 * in those; they're either from the "active" mode while we're trying 1292 * to check "search" mode, or a prior "search" mode after we've moved 1293 * to a new "search" mode (which might become the new "active" mode). 1294 */ 1295 table = &lq_sta->lq; 1296 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1297 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 1298 WARN_ON_ONCE(1); 1299 return; 1300 } 1301 1302 /* Here we actually compare this rate to the latest LQ command */ 1303 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1304 IWL_DEBUG_RATE(mvm, 1305 "tx resp color 0x%x does not match 0x%x\n", 1306 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1307 1308 /* 1309 * Since rates mis-match, the last LQ command may have failed. 1310 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1311 * ... driver. 1312 */ 1313 lq_sta->missed_rate_counter++; 1314 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1315 lq_sta->missed_rate_counter = 0; 1316 IWL_DEBUG_RATE(mvm, 1317 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1318 lq_sta->rs_state); 1319 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1320 } 1321 /* Regardless, ignore this status info for outdated rate */ 1322 return; 1323 } else 1324 /* Rate did match, so reset the missed_rate_counter */ 1325 lq_sta->missed_rate_counter = 0; 1326 1327 if (!lq_sta->search_better_tbl) { 1328 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1329 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1330 } else { 1331 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1332 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1333 } 1334 1335 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1336 IWL_DEBUG_RATE(mvm, 1337 "Neither active nor search matches tx rate\n"); 1338 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1339 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1340 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1341 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1342 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1343 1344 /* 1345 * no matching table found, let's by-pass the data collection 1346 * and continue to perform rate scale to find the rate table 1347 */ 1348 rs_stay_in_table(lq_sta, true); 1349 goto done; 1350 } 1351 1352 /* 1353 * Updating the frame history depends on whether packets were 1354 * aggregated. 1355 * 1356 * For aggregation, all packets were transmitted at the same rate, the 1357 * first index into rate scale table. 1358 */ 1359 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1360 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1361 info->status.ampdu_len, 1362 info->status.ampdu_ack_len, 1363 reduced_txp); 1364 1365 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1366 * it as a single frame loss as we don't want the success ratio 1367 * to dip too quickly because a BA wasn't received. 1368 * For TPC, there's no need for this optimisation since we want 1369 * to recover very quickly from a bad power reduction and, 1370 * therefore we'd like the success ratio to get an immediate hit 1371 * when failing to get a BA, so we'd switch back to a lower or 1372 * zero power reduction. When FW transmits agg with a rate 1373 * different from the initial rate, it will not use reduced txp 1374 * and will send BA notification twice (one empty with reduced 1375 * txp equal to the value from LQ and one with reduced txp 0). 1376 * We need to update counters for each txp level accordingly. 1377 */ 1378 if (info->status.ampdu_ack_len == 0) 1379 info->status.ampdu_len = 1; 1380 1381 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1382 info->status.ampdu_len, 1383 info->status.ampdu_ack_len); 1384 1385 /* Update success/fail counts if not searching for new mode */ 1386 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1387 lq_sta->total_success += info->status.ampdu_ack_len; 1388 lq_sta->total_failed += (info->status.ampdu_len - 1389 info->status.ampdu_ack_len); 1390 } 1391 } else { 1392 /* For legacy, update frame history with for each Tx retry. */ 1393 retries = info->status.rates[0].count - 1; 1394 /* HW doesn't send more than 15 retries */ 1395 retries = min(retries, 15); 1396 1397 /* The last transmission may have been successful */ 1398 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1399 /* Collect data for each rate used during failed TX attempts */ 1400 for (i = 0; i <= retries; ++i) { 1401 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1402 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 1403 &lq_rate)) { 1404 WARN_ON_ONCE(1); 1405 return; 1406 } 1407 1408 /* 1409 * Only collect stats if retried rate is in the same RS 1410 * table as active/search. 1411 */ 1412 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1413 tmp_tbl = curr_tbl; 1414 else if (rs_rate_column_match(&lq_rate, 1415 &other_tbl->rate)) 1416 tmp_tbl = other_tbl; 1417 else 1418 continue; 1419 1420 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1421 tx_resp_rate.index, 1, 1422 i < retries ? 0 : legacy_success, 1423 reduced_txp); 1424 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1425 tx_resp_rate.index, 1, 1426 i < retries ? 0 : legacy_success); 1427 } 1428 1429 /* Update success/fail counts if not searching for new mode */ 1430 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1431 lq_sta->total_success += legacy_success; 1432 lq_sta->total_failed += retries + (1 - legacy_success); 1433 } 1434 } 1435 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1436 lq_sta->last_rate_n_flags = lq_hwrate; 1437 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1438 done: 1439 /* See if there's a better rate or modulation mode to try. */ 1440 if (sta->supp_rates[info->band]) 1441 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1442 } 1443 1444 /* 1445 * mac80211 sends us Tx status 1446 */ 1447 static void rs_drv_mac80211_tx_status(void *mvm_r, 1448 struct ieee80211_supported_band *sband, 1449 struct ieee80211_sta *sta, void *priv_sta, 1450 struct sk_buff *skb) 1451 { 1452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1453 struct iwl_op_mode *op_mode = mvm_r; 1454 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1455 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1456 1457 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1458 return; 1459 1460 if (!ieee80211_is_data(hdr->frame_control) || 1461 info->flags & IEEE80211_TX_CTL_NO_ACK) 1462 return; 1463 1464 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1465 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1466 } 1467 1468 /* 1469 * Begin a period of staying with a selected modulation mode. 1470 * Set "stay_in_tbl" flag to prevent any mode switches. 1471 * Set frame tx success limits according to legacy vs. high-throughput, 1472 * and reset overall (spanning all rates) tx success history statistics. 1473 * These control how long we stay using same modulation mode before 1474 * searching for a new mode. 1475 */ 1476 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1477 struct iwl_lq_sta *lq_sta) 1478 { 1479 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1480 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1481 if (is_legacy) { 1482 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1483 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1484 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1485 } else { 1486 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1487 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1488 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1489 } 1490 lq_sta->table_count = 0; 1491 lq_sta->total_failed = 0; 1492 lq_sta->total_success = 0; 1493 lq_sta->flush_timer = jiffies; 1494 lq_sta->visited_columns = 0; 1495 } 1496 1497 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1498 { 1499 if (rate_mask) 1500 return find_last_bit(&rate_mask, BITS_PER_LONG); 1501 return IWL_RATE_INVALID; 1502 } 1503 1504 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1505 const struct rs_tx_column *column) 1506 { 1507 switch (column->mode) { 1508 case RS_LEGACY: 1509 return lq_sta->max_legacy_rate_idx; 1510 case RS_SISO: 1511 return lq_sta->max_siso_rate_idx; 1512 case RS_MIMO2: 1513 return lq_sta->max_mimo2_rate_idx; 1514 default: 1515 WARN_ON_ONCE(1); 1516 } 1517 1518 return lq_sta->max_legacy_rate_idx; 1519 } 1520 1521 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1522 const struct rs_tx_column *column, 1523 u32 bw) 1524 { 1525 /* Used to choose among HT tables */ 1526 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1527 1528 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1529 column->mode != RS_SISO && 1530 column->mode != RS_MIMO2)) 1531 return expected_tpt_legacy; 1532 1533 /* Legacy rates have only one table */ 1534 if (column->mode == RS_LEGACY) 1535 return expected_tpt_legacy; 1536 1537 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1538 /* Choose among many HT tables depending on number of streams 1539 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1540 * status */ 1541 if (column->mode == RS_SISO) { 1542 switch (bw) { 1543 case RATE_MCS_CHAN_WIDTH_20: 1544 ht_tbl_pointer = expected_tpt_siso_20MHz; 1545 break; 1546 case RATE_MCS_CHAN_WIDTH_40: 1547 ht_tbl_pointer = expected_tpt_siso_40MHz; 1548 break; 1549 case RATE_MCS_CHAN_WIDTH_80: 1550 ht_tbl_pointer = expected_tpt_siso_80MHz; 1551 break; 1552 case RATE_MCS_CHAN_WIDTH_160: 1553 ht_tbl_pointer = expected_tpt_siso_160MHz; 1554 break; 1555 default: 1556 WARN_ON_ONCE(1); 1557 } 1558 } else if (column->mode == RS_MIMO2) { 1559 switch (bw) { 1560 case RATE_MCS_CHAN_WIDTH_20: 1561 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1562 break; 1563 case RATE_MCS_CHAN_WIDTH_40: 1564 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1565 break; 1566 case RATE_MCS_CHAN_WIDTH_80: 1567 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1568 break; 1569 case RATE_MCS_CHAN_WIDTH_160: 1570 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1571 break; 1572 default: 1573 WARN_ON_ONCE(1); 1574 } 1575 } else { 1576 WARN_ON_ONCE(1); 1577 } 1578 1579 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1580 return ht_tbl_pointer[0]; 1581 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1582 return ht_tbl_pointer[1]; 1583 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1584 return ht_tbl_pointer[2]; 1585 else /* AGG+SGI */ 1586 return ht_tbl_pointer[3]; 1587 } 1588 1589 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1590 struct iwl_scale_tbl_info *tbl) 1591 { 1592 struct rs_rate *rate = &tbl->rate; 1593 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1594 1595 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1596 } 1597 1598 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1599 struct iwl_lq_sta *lq_sta, 1600 struct iwl_scale_tbl_info *tbl, /* "search" */ 1601 unsigned long rate_mask, s8 index) 1602 { 1603 struct iwl_scale_tbl_info *active_tbl = 1604 &(lq_sta->lq_info[lq_sta->active_tbl]); 1605 s32 success_ratio = active_tbl->win[index].success_ratio; 1606 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1607 const u16 *tpt_tbl = tbl->expected_tpt; 1608 u16 high_low; 1609 u32 target_tpt; 1610 int rate_idx; 1611 1612 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1613 target_tpt = 100 * expected_current_tpt; 1614 IWL_DEBUG_RATE(mvm, 1615 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1616 success_ratio, target_tpt); 1617 } else { 1618 target_tpt = lq_sta->last_tpt; 1619 IWL_DEBUG_RATE(mvm, 1620 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1621 success_ratio, target_tpt); 1622 } 1623 1624 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1625 1626 while (rate_idx != IWL_RATE_INVALID) { 1627 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1628 break; 1629 1630 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1631 tbl->rate.type); 1632 1633 rate_idx = (high_low >> 8) & 0xff; 1634 } 1635 1636 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1637 rate_idx, target_tpt, 1638 rate_idx != IWL_RATE_INVALID ? 1639 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1640 1641 return rate_idx; 1642 } 1643 1644 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1645 { 1646 switch (sta->bandwidth) { 1647 case IEEE80211_STA_RX_BW_160: 1648 return RATE_MCS_CHAN_WIDTH_160; 1649 case IEEE80211_STA_RX_BW_80: 1650 return RATE_MCS_CHAN_WIDTH_80; 1651 case IEEE80211_STA_RX_BW_40: 1652 return RATE_MCS_CHAN_WIDTH_40; 1653 case IEEE80211_STA_RX_BW_20: 1654 default: 1655 return RATE_MCS_CHAN_WIDTH_20; 1656 } 1657 } 1658 1659 /* 1660 * Check whether we should continue using same modulation mode, or 1661 * begin search for a new mode, based on: 1662 * 1) # tx successes or failures while using this mode 1663 * 2) # times calling this function 1664 * 3) elapsed time in this mode (not used, for now) 1665 */ 1666 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1667 { 1668 struct iwl_scale_tbl_info *tbl; 1669 int active_tbl; 1670 int flush_interval_passed = 0; 1671 struct iwl_mvm *mvm; 1672 1673 mvm = lq_sta->pers.drv; 1674 active_tbl = lq_sta->active_tbl; 1675 1676 tbl = &(lq_sta->lq_info[active_tbl]); 1677 1678 /* If we've been disallowing search, see if we should now allow it */ 1679 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1680 /* Elapsed time using current modulation mode */ 1681 if (lq_sta->flush_timer) 1682 flush_interval_passed = 1683 time_after(jiffies, 1684 (unsigned long)(lq_sta->flush_timer + 1685 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1686 1687 /* 1688 * Check if we should allow search for new modulation mode. 1689 * If many frames have failed or succeeded, or we've used 1690 * this same modulation for a long time, allow search, and 1691 * reset history stats that keep track of whether we should 1692 * allow a new search. Also (below) reset all bitmaps and 1693 * stats in active history. 1694 */ 1695 if (force_search || 1696 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1697 (lq_sta->total_success > lq_sta->max_success_limit) || 1698 ((!lq_sta->search_better_tbl) && 1699 (lq_sta->flush_timer) && (flush_interval_passed))) { 1700 IWL_DEBUG_RATE(mvm, 1701 "LQ: stay is expired %d %d %d\n", 1702 lq_sta->total_failed, 1703 lq_sta->total_success, 1704 flush_interval_passed); 1705 1706 /* Allow search for new mode */ 1707 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1708 IWL_DEBUG_RATE(mvm, 1709 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1710 lq_sta->total_failed = 0; 1711 lq_sta->total_success = 0; 1712 lq_sta->flush_timer = 0; 1713 /* mark the current column as visited */ 1714 lq_sta->visited_columns = BIT(tbl->column); 1715 /* 1716 * Else if we've used this modulation mode enough repetitions 1717 * (regardless of elapsed time or success/failure), reset 1718 * history bitmaps and rate-specific stats for all rates in 1719 * active table. 1720 */ 1721 } else { 1722 lq_sta->table_count++; 1723 if (lq_sta->table_count >= 1724 lq_sta->table_count_limit) { 1725 lq_sta->table_count = 0; 1726 1727 IWL_DEBUG_RATE(mvm, 1728 "LQ: stay in table clear win\n"); 1729 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1730 } 1731 } 1732 1733 /* If transitioning to allow "search", reset all history 1734 * bitmaps and stats in active table (this will become the new 1735 * "search" table). */ 1736 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1737 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1738 } 1739 } 1740 } 1741 1742 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1743 struct iwl_scale_tbl_info *tbl, 1744 enum rs_action scale_action) 1745 { 1746 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1747 1748 /* 1749 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1750 * or 0, since there is no per-TID alg. 1751 */ 1752 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1753 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1754 scale_action == RS_ACTION_DOWNSCALE) 1755 mvmsta->amsdu_enabled = 0; 1756 else 1757 mvmsta->amsdu_enabled = 0xFFFF; 1758 1759 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1760 } 1761 1762 /* 1763 * setup rate table in uCode 1764 */ 1765 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1766 struct ieee80211_sta *sta, 1767 struct iwl_lq_sta *lq_sta, 1768 struct iwl_scale_tbl_info *tbl) 1769 { 1770 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1771 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1772 } 1773 1774 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1775 struct ieee80211_sta *sta, 1776 struct iwl_lq_sta *lq_sta, 1777 struct iwl_scale_tbl_info *tbl, 1778 enum rs_action scale_action) 1779 { 1780 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1781 return false; 1782 1783 if (!is_vht_siso(&tbl->rate)) 1784 return false; 1785 1786 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1787 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1788 (scale_action == RS_ACTION_DOWNSCALE)) { 1789 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1790 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1791 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1792 goto tweaked; 1793 } 1794 1795 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1796 * sustainable, i.e. we're past the test window. We can't go back 1797 * if MCS5 is just tested as this will happen always after switching 1798 * to 20Mhz MCS4 because the rate stats are cleared. 1799 */ 1800 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1801 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1802 (scale_action == RS_ACTION_STAY)) || 1803 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1804 (scale_action == RS_ACTION_UPSCALE)))) { 1805 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1806 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1807 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1808 goto tweaked; 1809 } 1810 1811 return false; 1812 1813 tweaked: 1814 rs_set_expected_tpt_table(lq_sta, tbl); 1815 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1816 return true; 1817 } 1818 1819 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1820 struct iwl_lq_sta *lq_sta, 1821 struct ieee80211_sta *sta, 1822 struct iwl_scale_tbl_info *tbl) 1823 { 1824 int i, j, max_rate; 1825 enum rs_column next_col_id; 1826 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1827 const struct rs_tx_column *next_col; 1828 allow_column_func_t allow_func; 1829 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1830 const u16 *expected_tpt_tbl; 1831 u16 tpt, max_expected_tpt; 1832 1833 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1834 next_col_id = curr_col->next_columns[i]; 1835 1836 if (next_col_id == RS_COLUMN_INVALID) 1837 continue; 1838 1839 if (lq_sta->visited_columns & BIT(next_col_id)) { 1840 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1841 next_col_id); 1842 continue; 1843 } 1844 1845 next_col = &rs_tx_columns[next_col_id]; 1846 1847 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1848 IWL_DEBUG_RATE(mvm, 1849 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1850 next_col_id, valid_ants, next_col->ant); 1851 continue; 1852 } 1853 1854 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1855 allow_func = next_col->checks[j]; 1856 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1857 next_col)) 1858 break; 1859 } 1860 1861 if (j != MAX_COLUMN_CHECKS) { 1862 IWL_DEBUG_RATE(mvm, 1863 "Skip column %d: not allowed (check %d failed)\n", 1864 next_col_id, j); 1865 1866 continue; 1867 } 1868 1869 tpt = lq_sta->last_tpt / 100; 1870 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1871 rs_bw_from_sta_bw(sta)); 1872 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1873 continue; 1874 1875 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1876 if (max_rate == IWL_RATE_INVALID) { 1877 IWL_DEBUG_RATE(mvm, 1878 "Skip column %d: no rate is allowed in this column\n", 1879 next_col_id); 1880 continue; 1881 } 1882 1883 max_expected_tpt = expected_tpt_tbl[max_rate]; 1884 if (tpt >= max_expected_tpt) { 1885 IWL_DEBUG_RATE(mvm, 1886 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1887 next_col_id, max_expected_tpt, tpt); 1888 continue; 1889 } 1890 1891 IWL_DEBUG_RATE(mvm, 1892 "Found potential column %d. Max expected %d current %d\n", 1893 next_col_id, max_expected_tpt, tpt); 1894 break; 1895 } 1896 1897 if (i == MAX_NEXT_COLUMNS) 1898 return RS_COLUMN_INVALID; 1899 1900 return next_col_id; 1901 } 1902 1903 static int rs_switch_to_column(struct iwl_mvm *mvm, 1904 struct iwl_lq_sta *lq_sta, 1905 struct ieee80211_sta *sta, 1906 enum rs_column col_id) 1907 { 1908 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1909 struct iwl_scale_tbl_info *search_tbl = 1910 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1911 struct rs_rate *rate = &search_tbl->rate; 1912 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1913 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1914 unsigned long rate_mask = 0; 1915 u32 rate_idx = 0; 1916 1917 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1918 1919 rate->sgi = column->sgi; 1920 rate->ant = column->ant; 1921 1922 if (column->mode == RS_LEGACY) { 1923 if (lq_sta->band == NL80211_BAND_5GHZ) 1924 rate->type = LQ_LEGACY_A; 1925 else 1926 rate->type = LQ_LEGACY_G; 1927 1928 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1929 rate->ldpc = false; 1930 rate_mask = lq_sta->active_legacy_rate; 1931 } else if (column->mode == RS_SISO) { 1932 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1933 rate_mask = lq_sta->active_siso_rate; 1934 } else if (column->mode == RS_MIMO2) { 1935 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1936 rate_mask = lq_sta->active_mimo2_rate; 1937 } else { 1938 WARN_ONCE(1, "Bad column mode"); 1939 } 1940 1941 if (column->mode != RS_LEGACY) { 1942 rate->bw = rs_bw_from_sta_bw(sta); 1943 rate->ldpc = lq_sta->ldpc; 1944 } 1945 1946 search_tbl->column = col_id; 1947 rs_set_expected_tpt_table(lq_sta, search_tbl); 1948 1949 lq_sta->visited_columns |= BIT(col_id); 1950 1951 /* Get the best matching rate if we're changing modes. e.g. 1952 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1953 */ 1954 if (curr_column->mode != column->mode) { 1955 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1956 rate_mask, rate->index); 1957 1958 if ((rate_idx == IWL_RATE_INVALID) || 1959 !(BIT(rate_idx) & rate_mask)) { 1960 IWL_DEBUG_RATE(mvm, 1961 "can not switch with index %d" 1962 " rate mask %lx\n", 1963 rate_idx, rate_mask); 1964 1965 goto err; 1966 } 1967 1968 rate->index = rate_idx; 1969 } 1970 1971 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1972 col_id, rate->index); 1973 1974 return 0; 1975 1976 err: 1977 rate->type = LQ_NONE; 1978 return -1; 1979 } 1980 1981 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1982 struct iwl_scale_tbl_info *tbl, 1983 s32 sr, int low, int high, 1984 int current_tpt, 1985 int low_tpt, int high_tpt) 1986 { 1987 enum rs_action action = RS_ACTION_STAY; 1988 1989 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1990 (current_tpt == 0)) { 1991 IWL_DEBUG_RATE(mvm, 1992 "Decrease rate because of low SR\n"); 1993 return RS_ACTION_DOWNSCALE; 1994 } 1995 1996 if ((low_tpt == IWL_INVALID_VALUE) && 1997 (high_tpt == IWL_INVALID_VALUE) && 1998 (high != IWL_RATE_INVALID)) { 1999 IWL_DEBUG_RATE(mvm, 2000 "No data about high/low rates. Increase rate\n"); 2001 return RS_ACTION_UPSCALE; 2002 } 2003 2004 if ((high_tpt == IWL_INVALID_VALUE) && 2005 (high != IWL_RATE_INVALID) && 2006 (low_tpt != IWL_INVALID_VALUE) && 2007 (low_tpt < current_tpt)) { 2008 IWL_DEBUG_RATE(mvm, 2009 "No data about high rate and low rate is worse. Increase rate\n"); 2010 return RS_ACTION_UPSCALE; 2011 } 2012 2013 if ((high_tpt != IWL_INVALID_VALUE) && 2014 (high_tpt > current_tpt)) { 2015 IWL_DEBUG_RATE(mvm, 2016 "Higher rate is better. Increate rate\n"); 2017 return RS_ACTION_UPSCALE; 2018 } 2019 2020 if ((low_tpt != IWL_INVALID_VALUE) && 2021 (high_tpt != IWL_INVALID_VALUE) && 2022 (low_tpt < current_tpt) && 2023 (high_tpt < current_tpt)) { 2024 IWL_DEBUG_RATE(mvm, 2025 "Both high and low are worse. Maintain rate\n"); 2026 return RS_ACTION_STAY; 2027 } 2028 2029 if ((low_tpt != IWL_INVALID_VALUE) && 2030 (low_tpt > current_tpt)) { 2031 IWL_DEBUG_RATE(mvm, 2032 "Lower rate is better\n"); 2033 action = RS_ACTION_DOWNSCALE; 2034 goto out; 2035 } 2036 2037 if ((low_tpt == IWL_INVALID_VALUE) && 2038 (low != IWL_RATE_INVALID)) { 2039 IWL_DEBUG_RATE(mvm, 2040 "No data about lower rate\n"); 2041 action = RS_ACTION_DOWNSCALE; 2042 goto out; 2043 } 2044 2045 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2046 2047 out: 2048 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2049 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2050 IWL_DEBUG_RATE(mvm, 2051 "SR is above NO DECREASE. Avoid downscale\n"); 2052 action = RS_ACTION_STAY; 2053 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2054 IWL_DEBUG_RATE(mvm, 2055 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2056 action = RS_ACTION_STAY; 2057 } else { 2058 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2059 } 2060 } 2061 2062 return action; 2063 } 2064 2065 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2066 struct iwl_lq_sta *lq_sta) 2067 { 2068 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2069 * supports STBC of at least 1*SS 2070 */ 2071 if (!lq_sta->stbc_capable) 2072 return false; 2073 2074 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2075 return false; 2076 2077 return true; 2078 } 2079 2080 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2081 int *weaker, int *stronger) 2082 { 2083 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2084 if (*weaker > TPC_MAX_REDUCTION) 2085 *weaker = TPC_INVALID; 2086 2087 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2088 if (*stronger < 0) 2089 *stronger = TPC_INVALID; 2090 } 2091 2092 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2093 struct rs_rate *rate, enum nl80211_band band) 2094 { 2095 int index = rate->index; 2096 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2097 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2098 !vif->bss_conf.ps); 2099 2100 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2101 cam, sta_ps_disabled); 2102 /* 2103 * allow tpc only if power management is enabled, or bt coex 2104 * activity grade allows it and we are on 2.4Ghz. 2105 */ 2106 if ((cam || sta_ps_disabled) && 2107 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2108 return false; 2109 2110 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2111 if (is_legacy(rate)) 2112 return index == IWL_RATE_54M_INDEX; 2113 if (is_ht(rate)) 2114 return index == IWL_RATE_MCS_7_INDEX; 2115 if (is_vht(rate)) 2116 return index == IWL_RATE_MCS_7_INDEX || 2117 index == IWL_RATE_MCS_8_INDEX || 2118 index == IWL_RATE_MCS_9_INDEX; 2119 2120 WARN_ON_ONCE(1); 2121 return false; 2122 } 2123 2124 enum tpc_action { 2125 TPC_ACTION_STAY, 2126 TPC_ACTION_DECREASE, 2127 TPC_ACTION_INCREASE, 2128 TPC_ACTION_NO_RESTIRCTION, 2129 }; 2130 2131 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2132 s32 sr, int weak, int strong, 2133 int current_tpt, 2134 int weak_tpt, int strong_tpt) 2135 { 2136 /* stay until we have valid tpt */ 2137 if (current_tpt == IWL_INVALID_VALUE) { 2138 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2139 return TPC_ACTION_STAY; 2140 } 2141 2142 /* Too many failures, increase txp */ 2143 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2144 current_tpt == 0) { 2145 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2146 return TPC_ACTION_NO_RESTIRCTION; 2147 } 2148 2149 /* try decreasing first if applicable */ 2150 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2151 weak != TPC_INVALID) { 2152 if (weak_tpt == IWL_INVALID_VALUE && 2153 (strong_tpt == IWL_INVALID_VALUE || 2154 current_tpt >= strong_tpt)) { 2155 IWL_DEBUG_RATE(mvm, 2156 "no weak txp measurement. decrease txp\n"); 2157 return TPC_ACTION_DECREASE; 2158 } 2159 2160 if (weak_tpt > current_tpt) { 2161 IWL_DEBUG_RATE(mvm, 2162 "lower txp has better tpt. decrease txp\n"); 2163 return TPC_ACTION_DECREASE; 2164 } 2165 } 2166 2167 /* next, increase if needed */ 2168 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2169 strong != TPC_INVALID) { 2170 if (weak_tpt == IWL_INVALID_VALUE && 2171 strong_tpt != IWL_INVALID_VALUE && 2172 current_tpt < strong_tpt) { 2173 IWL_DEBUG_RATE(mvm, 2174 "higher txp has better tpt. increase txp\n"); 2175 return TPC_ACTION_INCREASE; 2176 } 2177 2178 if (weak_tpt < current_tpt && 2179 (strong_tpt == IWL_INVALID_VALUE || 2180 strong_tpt > current_tpt)) { 2181 IWL_DEBUG_RATE(mvm, 2182 "lower txp has worse tpt. increase txp\n"); 2183 return TPC_ACTION_INCREASE; 2184 } 2185 } 2186 2187 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2188 return TPC_ACTION_STAY; 2189 } 2190 2191 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2192 struct ieee80211_sta *sta, 2193 struct iwl_lq_sta *lq_sta, 2194 struct iwl_scale_tbl_info *tbl) 2195 { 2196 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2197 struct ieee80211_vif *vif = mvm_sta->vif; 2198 struct ieee80211_chanctx_conf *chanctx_conf; 2199 enum nl80211_band band; 2200 struct iwl_rate_scale_data *window; 2201 struct rs_rate *rate = &tbl->rate; 2202 enum tpc_action action; 2203 s32 sr; 2204 u8 cur = lq_sta->lq.reduced_tpc; 2205 int current_tpt; 2206 int weak, strong; 2207 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2208 2209 #ifdef CONFIG_MAC80211_DEBUGFS 2210 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2211 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2212 lq_sta->pers.dbg_fixed_txp_reduction); 2213 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2214 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2215 } 2216 #endif 2217 2218 rcu_read_lock(); 2219 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2220 if (WARN_ON(!chanctx_conf)) 2221 band = NUM_NL80211_BANDS; 2222 else 2223 band = chanctx_conf->def.chan->band; 2224 rcu_read_unlock(); 2225 2226 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2227 IWL_DEBUG_RATE(mvm, 2228 "tpc is not allowed. remove txp restrictions\n"); 2229 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2230 return cur != TPC_NO_REDUCTION; 2231 } 2232 2233 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2234 2235 /* Collect measured throughputs for current and adjacent rates */ 2236 window = tbl->tpc_win; 2237 sr = window[cur].success_ratio; 2238 current_tpt = window[cur].average_tpt; 2239 if (weak != TPC_INVALID) 2240 weak_tpt = window[weak].average_tpt; 2241 if (strong != TPC_INVALID) 2242 strong_tpt = window[strong].average_tpt; 2243 2244 IWL_DEBUG_RATE(mvm, 2245 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2246 cur, current_tpt, sr, weak, strong, 2247 weak_tpt, strong_tpt); 2248 2249 action = rs_get_tpc_action(mvm, sr, weak, strong, 2250 current_tpt, weak_tpt, strong_tpt); 2251 2252 /* override actions if we are on the edge */ 2253 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2254 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2255 action = TPC_ACTION_STAY; 2256 } else if (strong == TPC_INVALID && 2257 (action == TPC_ACTION_INCREASE || 2258 action == TPC_ACTION_NO_RESTIRCTION)) { 2259 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2260 action = TPC_ACTION_STAY; 2261 } 2262 2263 switch (action) { 2264 case TPC_ACTION_DECREASE: 2265 lq_sta->lq.reduced_tpc = weak; 2266 return true; 2267 case TPC_ACTION_INCREASE: 2268 lq_sta->lq.reduced_tpc = strong; 2269 return true; 2270 case TPC_ACTION_NO_RESTIRCTION: 2271 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2272 return true; 2273 case TPC_ACTION_STAY: 2274 /* do nothing */ 2275 break; 2276 } 2277 return false; 2278 } 2279 2280 /* 2281 * Do rate scaling and search for new modulation mode. 2282 */ 2283 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2284 struct ieee80211_sta *sta, 2285 struct iwl_lq_sta *lq_sta, 2286 int tid, bool ndp) 2287 { 2288 int low = IWL_RATE_INVALID; 2289 int high = IWL_RATE_INVALID; 2290 int index; 2291 struct iwl_rate_scale_data *window = NULL; 2292 int current_tpt = IWL_INVALID_VALUE; 2293 int low_tpt = IWL_INVALID_VALUE; 2294 int high_tpt = IWL_INVALID_VALUE; 2295 u32 fail_count; 2296 enum rs_action scale_action = RS_ACTION_STAY; 2297 u16 rate_mask; 2298 u8 update_lq = 0; 2299 struct iwl_scale_tbl_info *tbl, *tbl1; 2300 u8 active_tbl = 0; 2301 u8 done_search = 0; 2302 u16 high_low; 2303 s32 sr; 2304 u8 prev_agg = lq_sta->is_agg; 2305 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2306 struct rs_rate *rate; 2307 2308 lq_sta->is_agg = !!mvmsta->agg_tids; 2309 2310 /* 2311 * Select rate-scale / modulation-mode table to work with in 2312 * the rest of this function: "search" if searching for better 2313 * modulation mode, or "active" if doing rate scaling within a mode. 2314 */ 2315 if (!lq_sta->search_better_tbl) 2316 active_tbl = lq_sta->active_tbl; 2317 else 2318 active_tbl = 1 - lq_sta->active_tbl; 2319 2320 tbl = &(lq_sta->lq_info[active_tbl]); 2321 rate = &tbl->rate; 2322 2323 if (prev_agg != lq_sta->is_agg) { 2324 IWL_DEBUG_RATE(mvm, 2325 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2326 prev_agg, lq_sta->is_agg); 2327 rs_set_expected_tpt_table(lq_sta, tbl); 2328 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2329 } 2330 2331 /* current tx rate */ 2332 index = rate->index; 2333 2334 /* rates available for this association, and for modulation mode */ 2335 rate_mask = rs_get_supported_rates(lq_sta, rate); 2336 2337 if (!(BIT(index) & rate_mask)) { 2338 IWL_ERR(mvm, "Current Rate is not valid\n"); 2339 if (lq_sta->search_better_tbl) { 2340 /* revert to active table if search table is not valid*/ 2341 rate->type = LQ_NONE; 2342 lq_sta->search_better_tbl = 0; 2343 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2344 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2345 } 2346 return; 2347 } 2348 2349 /* Get expected throughput table and history window for current rate */ 2350 if (!tbl->expected_tpt) { 2351 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2352 return; 2353 } 2354 2355 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2356 window = &(tbl->win[index]); 2357 2358 /* 2359 * If there is not enough history to calculate actual average 2360 * throughput, keep analyzing results of more tx frames, without 2361 * changing rate or mode (bypass most of the rest of this function). 2362 * Set up new rate table in uCode only if old rate is not supported 2363 * in current association (use new rate found above). 2364 */ 2365 fail_count = window->counter - window->success_counter; 2366 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2367 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2368 IWL_DEBUG_RATE(mvm, 2369 "%s: Test Window: succ %d total %d\n", 2370 rs_pretty_rate(rate), 2371 window->success_counter, window->counter); 2372 2373 /* Can't calculate this yet; not enough history */ 2374 window->average_tpt = IWL_INVALID_VALUE; 2375 2376 /* Should we stay with this modulation mode, 2377 * or search for a new one? */ 2378 rs_stay_in_table(lq_sta, false); 2379 2380 return; 2381 } 2382 2383 /* If we are searching for better modulation mode, check success. */ 2384 if (lq_sta->search_better_tbl) { 2385 /* If good success, continue using the "search" mode; 2386 * no need to send new link quality command, since we're 2387 * continuing to use the setup that we've been trying. */ 2388 if (window->average_tpt > lq_sta->last_tpt) { 2389 IWL_DEBUG_RATE(mvm, 2390 "SWITCHING TO NEW TABLE SR: %d " 2391 "cur-tpt %d old-tpt %d\n", 2392 window->success_ratio, 2393 window->average_tpt, 2394 lq_sta->last_tpt); 2395 2396 /* Swap tables; "search" becomes "active" */ 2397 lq_sta->active_tbl = active_tbl; 2398 current_tpt = window->average_tpt; 2399 /* Else poor success; go back to mode in "active" table */ 2400 } else { 2401 IWL_DEBUG_RATE(mvm, 2402 "GOING BACK TO THE OLD TABLE: SR %d " 2403 "cur-tpt %d old-tpt %d\n", 2404 window->success_ratio, 2405 window->average_tpt, 2406 lq_sta->last_tpt); 2407 2408 /* Nullify "search" table */ 2409 rate->type = LQ_NONE; 2410 2411 /* Revert to "active" table */ 2412 active_tbl = lq_sta->active_tbl; 2413 tbl = &(lq_sta->lq_info[active_tbl]); 2414 2415 /* Revert to "active" rate and throughput info */ 2416 index = tbl->rate.index; 2417 current_tpt = lq_sta->last_tpt; 2418 2419 /* Need to set up a new rate table in uCode */ 2420 update_lq = 1; 2421 } 2422 2423 /* Either way, we've made a decision; modulation mode 2424 * search is done, allow rate adjustment next time. */ 2425 lq_sta->search_better_tbl = 0; 2426 done_search = 1; /* Don't switch modes below! */ 2427 goto lq_update; 2428 } 2429 2430 /* (Else) not in search of better modulation mode, try for better 2431 * starting rate, while staying in this mode. */ 2432 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2433 low = high_low & 0xff; 2434 high = (high_low >> 8) & 0xff; 2435 2436 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2437 2438 sr = window->success_ratio; 2439 2440 /* Collect measured throughputs for current and adjacent rates */ 2441 current_tpt = window->average_tpt; 2442 if (low != IWL_RATE_INVALID) 2443 low_tpt = tbl->win[low].average_tpt; 2444 if (high != IWL_RATE_INVALID) 2445 high_tpt = tbl->win[high].average_tpt; 2446 2447 IWL_DEBUG_RATE(mvm, 2448 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2449 rs_pretty_rate(rate), current_tpt, sr, 2450 low, high, low_tpt, high_tpt); 2451 2452 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2453 current_tpt, low_tpt, high_tpt); 2454 2455 /* Force a search in case BT doesn't like us being in MIMO */ 2456 if (is_mimo(rate) && 2457 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2458 IWL_DEBUG_RATE(mvm, 2459 "BT Coex forbids MIMO. Search for new config\n"); 2460 rs_stay_in_table(lq_sta, true); 2461 goto lq_update; 2462 } 2463 2464 switch (scale_action) { 2465 case RS_ACTION_DOWNSCALE: 2466 /* Decrease starting rate, update uCode's rate table */ 2467 if (low != IWL_RATE_INVALID) { 2468 update_lq = 1; 2469 index = low; 2470 } else { 2471 IWL_DEBUG_RATE(mvm, 2472 "At the bottom rate. Can't decrease\n"); 2473 } 2474 2475 break; 2476 case RS_ACTION_UPSCALE: 2477 /* Increase starting rate, update uCode's rate table */ 2478 if (high != IWL_RATE_INVALID) { 2479 update_lq = 1; 2480 index = high; 2481 } else { 2482 IWL_DEBUG_RATE(mvm, 2483 "At the top rate. Can't increase\n"); 2484 } 2485 2486 break; 2487 case RS_ACTION_STAY: 2488 /* No change */ 2489 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2490 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2491 break; 2492 default: 2493 break; 2494 } 2495 2496 lq_update: 2497 /* Replace uCode's rate table for the destination station. */ 2498 if (update_lq) { 2499 tbl->rate.index = index; 2500 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2501 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2502 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2503 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2504 } 2505 2506 rs_stay_in_table(lq_sta, false); 2507 2508 /* 2509 * Search for new modulation mode if we're: 2510 * 1) Not changing rates right now 2511 * 2) Not just finishing up a search 2512 * 3) Allowing a new search 2513 */ 2514 if (!update_lq && !done_search && 2515 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2516 && window->counter) { 2517 enum rs_column next_column; 2518 2519 /* Save current throughput to compare with "search" throughput*/ 2520 lq_sta->last_tpt = current_tpt; 2521 2522 IWL_DEBUG_RATE(mvm, 2523 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2524 update_lq, done_search, lq_sta->rs_state, 2525 window->counter); 2526 2527 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2528 if (next_column != RS_COLUMN_INVALID) { 2529 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2530 next_column); 2531 if (!ret) 2532 lq_sta->search_better_tbl = 1; 2533 } else { 2534 IWL_DEBUG_RATE(mvm, 2535 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2536 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2537 } 2538 2539 /* If new "search" mode was selected, set up in uCode table */ 2540 if (lq_sta->search_better_tbl) { 2541 /* Access the "search" table, clear its history. */ 2542 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2543 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2544 2545 /* Use new "search" start rate */ 2546 index = tbl->rate.index; 2547 2548 rs_dump_rate(mvm, &tbl->rate, 2549 "Switch to SEARCH TABLE:"); 2550 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2551 } else { 2552 done_search = 1; 2553 } 2554 } 2555 2556 if (!ndp) 2557 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2558 2559 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2560 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2561 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2562 } 2563 } 2564 2565 struct rs_init_rate_info { 2566 s8 rssi; 2567 u8 rate_idx; 2568 }; 2569 2570 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2571 { -60, IWL_RATE_54M_INDEX }, 2572 { -64, IWL_RATE_48M_INDEX }, 2573 { -68, IWL_RATE_36M_INDEX }, 2574 { -80, IWL_RATE_24M_INDEX }, 2575 { -84, IWL_RATE_18M_INDEX }, 2576 { -85, IWL_RATE_12M_INDEX }, 2577 { -86, IWL_RATE_11M_INDEX }, 2578 { -88, IWL_RATE_5M_INDEX }, 2579 { -90, IWL_RATE_2M_INDEX }, 2580 { S8_MIN, IWL_RATE_1M_INDEX }, 2581 }; 2582 2583 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2584 { -60, IWL_RATE_54M_INDEX }, 2585 { -64, IWL_RATE_48M_INDEX }, 2586 { -72, IWL_RATE_36M_INDEX }, 2587 { -80, IWL_RATE_24M_INDEX }, 2588 { -84, IWL_RATE_18M_INDEX }, 2589 { -85, IWL_RATE_12M_INDEX }, 2590 { -87, IWL_RATE_9M_INDEX }, 2591 { S8_MIN, IWL_RATE_6M_INDEX }, 2592 }; 2593 2594 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2595 { -60, IWL_RATE_MCS_7_INDEX }, 2596 { -64, IWL_RATE_MCS_6_INDEX }, 2597 { -68, IWL_RATE_MCS_5_INDEX }, 2598 { -72, IWL_RATE_MCS_4_INDEX }, 2599 { -80, IWL_RATE_MCS_3_INDEX }, 2600 { -84, IWL_RATE_MCS_2_INDEX }, 2601 { -85, IWL_RATE_MCS_1_INDEX }, 2602 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2603 }; 2604 2605 /* MCS index 9 is not valid for 20MHz VHT channel width, 2606 * but is ok for 40, 80 and 160MHz channels. 2607 */ 2608 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2609 { -60, IWL_RATE_MCS_8_INDEX }, 2610 { -64, IWL_RATE_MCS_7_INDEX }, 2611 { -68, IWL_RATE_MCS_6_INDEX }, 2612 { -72, IWL_RATE_MCS_5_INDEX }, 2613 { -80, IWL_RATE_MCS_4_INDEX }, 2614 { -84, IWL_RATE_MCS_3_INDEX }, 2615 { -85, IWL_RATE_MCS_2_INDEX }, 2616 { -87, IWL_RATE_MCS_1_INDEX }, 2617 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2618 }; 2619 2620 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2621 { -60, IWL_RATE_MCS_9_INDEX }, 2622 { -64, IWL_RATE_MCS_8_INDEX }, 2623 { -68, IWL_RATE_MCS_7_INDEX }, 2624 { -72, IWL_RATE_MCS_6_INDEX }, 2625 { -80, IWL_RATE_MCS_5_INDEX }, 2626 { -84, IWL_RATE_MCS_4_INDEX }, 2627 { -85, IWL_RATE_MCS_3_INDEX }, 2628 { -87, IWL_RATE_MCS_2_INDEX }, 2629 { -88, IWL_RATE_MCS_1_INDEX }, 2630 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2631 }; 2632 2633 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2634 2635 /* Init the optimal rate based on STA caps 2636 * This combined with rssi is used to report the last tx rate 2637 * to userspace when we haven't transmitted enough frames. 2638 */ 2639 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2640 struct ieee80211_sta *sta, 2641 struct iwl_lq_sta *lq_sta) 2642 { 2643 struct rs_rate *rate = &lq_sta->optimal_rate; 2644 2645 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2646 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2647 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2648 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2649 else if (lq_sta->band == NL80211_BAND_5GHZ) 2650 rate->type = LQ_LEGACY_A; 2651 else 2652 rate->type = LQ_LEGACY_G; 2653 2654 rate->bw = rs_bw_from_sta_bw(sta); 2655 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2656 2657 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2658 2659 if (is_mimo(rate)) { 2660 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2661 } else if (is_siso(rate)) { 2662 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2663 } else { 2664 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2665 2666 if (lq_sta->band == NL80211_BAND_5GHZ) { 2667 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2668 lq_sta->optimal_nentries = 2669 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2670 } else { 2671 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2672 lq_sta->optimal_nentries = 2673 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2674 } 2675 } 2676 2677 if (is_vht(rate)) { 2678 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2679 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2680 lq_sta->optimal_nentries = 2681 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2682 } else { 2683 lq_sta->optimal_rates = rs_optimal_rates_vht; 2684 lq_sta->optimal_nentries = 2685 ARRAY_SIZE(rs_optimal_rates_vht); 2686 } 2687 } else if (is_ht(rate)) { 2688 lq_sta->optimal_rates = rs_optimal_rates_ht; 2689 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2690 } 2691 } 2692 2693 /* Compute the optimal rate index based on RSSI */ 2694 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2695 struct iwl_lq_sta *lq_sta) 2696 { 2697 struct rs_rate *rate = &lq_sta->optimal_rate; 2698 int i; 2699 2700 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2701 BITS_PER_LONG); 2702 2703 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2704 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2705 2706 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2707 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2708 rate->index = rate_idx; 2709 break; 2710 } 2711 } 2712 2713 return rate; 2714 } 2715 2716 /* Choose an initial legacy rate and antenna to use based on the RSSI 2717 * of last Rx 2718 */ 2719 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2720 struct ieee80211_sta *sta, 2721 struct iwl_lq_sta *lq_sta, 2722 enum nl80211_band band, 2723 struct rs_rate *rate) 2724 { 2725 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2726 int i, nentries; 2727 unsigned long active_rate; 2728 s8 best_rssi = S8_MIN; 2729 u8 best_ant = ANT_NONE; 2730 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2731 const struct rs_init_rate_info *initial_rates; 2732 2733 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2734 if (!(lq_sta->pers.chains & BIT(i))) 2735 continue; 2736 2737 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2738 best_rssi = lq_sta->pers.chain_signal[i]; 2739 best_ant = BIT(i); 2740 } 2741 } 2742 2743 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2744 rs_pretty_ant(best_ant), best_rssi); 2745 2746 if (best_ant != ANT_A && best_ant != ANT_B) 2747 rate->ant = first_antenna(valid_tx_ant); 2748 else 2749 rate->ant = best_ant; 2750 2751 rate->sgi = false; 2752 rate->ldpc = false; 2753 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2754 2755 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2756 BITS_PER_LONG); 2757 2758 if (band == NL80211_BAND_5GHZ) { 2759 rate->type = LQ_LEGACY_A; 2760 initial_rates = rs_optimal_rates_5ghz_legacy; 2761 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2762 } else { 2763 rate->type = LQ_LEGACY_G; 2764 initial_rates = rs_optimal_rates_24ghz_legacy; 2765 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2766 } 2767 2768 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2769 goto out; 2770 2771 /* Start from a higher rate if the corresponding debug capability 2772 * is enabled. The rate is chosen according to AP capabilities. 2773 * In case of VHT/HT when the rssi is low fallback to the case of 2774 * legacy rates. 2775 */ 2776 if (sta->vht_cap.vht_supported && 2777 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2778 /* 2779 * In AP mode, when a new station associates, rs is initialized 2780 * immediately upon association completion, before the phy 2781 * context is updated with the association parameters, so the 2782 * sta bandwidth might be wider than the phy context allows. 2783 * To avoid this issue, always initialize rs with 20mhz 2784 * bandwidth rate, and after authorization, when the phy context 2785 * is already up-to-date, re-init rs with the correct bw. 2786 */ 2787 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2788 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2789 2790 switch (bw) { 2791 case RATE_MCS_CHAN_WIDTH_40: 2792 case RATE_MCS_CHAN_WIDTH_80: 2793 case RATE_MCS_CHAN_WIDTH_160: 2794 initial_rates = rs_optimal_rates_vht; 2795 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2796 break; 2797 case RATE_MCS_CHAN_WIDTH_20: 2798 initial_rates = rs_optimal_rates_vht_20mhz; 2799 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2800 break; 2801 default: 2802 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2803 goto out; 2804 } 2805 2806 active_rate = lq_sta->active_siso_rate; 2807 rate->type = LQ_VHT_SISO; 2808 rate->bw = bw; 2809 } else if (sta->ht_cap.ht_supported && 2810 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2811 initial_rates = rs_optimal_rates_ht; 2812 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2813 active_rate = lq_sta->active_siso_rate; 2814 rate->type = LQ_HT_SISO; 2815 } else { 2816 active_rate = lq_sta->active_legacy_rate; 2817 } 2818 2819 for (i = 0; i < nentries; i++) { 2820 int rate_idx = initial_rates[i].rate_idx; 2821 2822 if ((best_rssi >= initial_rates[i].rssi) && 2823 (BIT(rate_idx) & active_rate)) { 2824 rate->index = rate_idx; 2825 break; 2826 } 2827 } 2828 2829 out: 2830 rs_dump_rate(mvm, rate, "INITIAL"); 2831 } 2832 2833 /* Save info about RSSI of last Rx */ 2834 void rs_update_last_rssi(struct iwl_mvm *mvm, 2835 struct iwl_mvm_sta *mvmsta, 2836 struct ieee80211_rx_status *rx_status) 2837 { 2838 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2839 int i; 2840 2841 lq_sta->pers.chains = rx_status->chains; 2842 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2843 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2844 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2845 lq_sta->pers.last_rssi = S8_MIN; 2846 2847 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2848 if (!(lq_sta->pers.chains & BIT(i))) 2849 continue; 2850 2851 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2852 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2853 } 2854 } 2855 2856 /** 2857 * rs_initialize_lq - Initialize a station's hardware rate table 2858 * 2859 * The uCode's station table contains a table of fallback rates 2860 * for automatic fallback during transmission. 2861 * 2862 * NOTE: This sets up a default set of values. These will be replaced later 2863 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2864 * rc80211_simple. 2865 * 2866 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2867 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2868 * which requires station table entry to exist). 2869 */ 2870 static void rs_initialize_lq(struct iwl_mvm *mvm, 2871 struct ieee80211_sta *sta, 2872 struct iwl_lq_sta *lq_sta, 2873 enum nl80211_band band, bool update) 2874 { 2875 struct iwl_scale_tbl_info *tbl; 2876 struct rs_rate *rate; 2877 u8 active_tbl = 0; 2878 2879 if (!sta || !lq_sta) 2880 return; 2881 2882 if (!lq_sta->search_better_tbl) 2883 active_tbl = lq_sta->active_tbl; 2884 else 2885 active_tbl = 1 - lq_sta->active_tbl; 2886 2887 tbl = &(lq_sta->lq_info[active_tbl]); 2888 rate = &tbl->rate; 2889 2890 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2891 rs_init_optimal_rate(mvm, sta, lq_sta); 2892 2893 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2894 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2895 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2896 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2897 2898 tbl->column = rs_get_column_from_rate(rate); 2899 2900 rs_set_expected_tpt_table(lq_sta, tbl); 2901 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2902 /* TODO restore station should remember the lq cmd */ 2903 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update); 2904 } 2905 2906 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2907 void *mvm_sta, 2908 struct ieee80211_tx_rate_control *txrc) 2909 { 2910 struct iwl_op_mode *op_mode = mvm_r; 2911 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2912 struct sk_buff *skb = txrc->skb; 2913 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2914 struct iwl_lq_sta *lq_sta; 2915 struct rs_rate *optimal_rate; 2916 u32 last_ucode_rate; 2917 2918 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2919 /* if vif isn't initialized mvm doesn't know about 2920 * this station, so don't do anything with the it 2921 */ 2922 sta = NULL; 2923 mvm_sta = NULL; 2924 } 2925 2926 /* Send management frames and NO_ACK data using lowest rate. */ 2927 if (rate_control_send_low(sta, mvm_sta, txrc)) 2928 return; 2929 2930 if (!mvm_sta) 2931 return; 2932 2933 lq_sta = mvm_sta; 2934 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2935 info->band, &info->control.rates[0]); 2936 info->control.rates[0].count = 1; 2937 2938 /* Report the optimal rate based on rssi and STA caps if we haven't 2939 * converged yet (too little traffic) or exploring other modulations 2940 */ 2941 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2942 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2943 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2944 optimal_rate); 2945 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2946 &txrc->reported_rate); 2947 } 2948 } 2949 2950 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2951 gfp_t gfp) 2952 { 2953 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2954 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2955 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2956 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2957 2958 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2959 2960 lq_sta->pers.drv = mvm; 2961 #ifdef CONFIG_MAC80211_DEBUGFS 2962 lq_sta->pers.dbg_fixed_rate = 0; 2963 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2964 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2965 #endif 2966 lq_sta->pers.chains = 0; 2967 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2968 lq_sta->pers.last_rssi = S8_MIN; 2969 2970 return lq_sta; 2971 } 2972 2973 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2974 int nss) 2975 { 2976 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2977 (0x3 << (2 * (nss - 1))); 2978 rx_mcs >>= (2 * (nss - 1)); 2979 2980 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2981 return IWL_RATE_MCS_7_INDEX; 2982 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2983 return IWL_RATE_MCS_8_INDEX; 2984 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2985 return IWL_RATE_MCS_9_INDEX; 2986 2987 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2988 return -1; 2989 } 2990 2991 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2992 struct ieee80211_sta_vht_cap *vht_cap, 2993 struct iwl_lq_sta *lq_sta) 2994 { 2995 int i; 2996 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2997 2998 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2999 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 3000 if (i == IWL_RATE_9M_INDEX) 3001 continue; 3002 3003 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 3004 if (i == IWL_RATE_MCS_9_INDEX && 3005 sta->bandwidth == IEEE80211_STA_RX_BW_20) 3006 continue; 3007 3008 lq_sta->active_siso_rate |= BIT(i); 3009 } 3010 } 3011 3012 if (sta->rx_nss < 2) 3013 return; 3014 3015 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 3016 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 3017 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 3018 if (i == IWL_RATE_9M_INDEX) 3019 continue; 3020 3021 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 3022 if (i == IWL_RATE_MCS_9_INDEX && 3023 sta->bandwidth == IEEE80211_STA_RX_BW_20) 3024 continue; 3025 3026 lq_sta->active_mimo2_rate |= BIT(i); 3027 } 3028 } 3029 } 3030 3031 static void rs_ht_init(struct iwl_mvm *mvm, 3032 struct ieee80211_sta *sta, 3033 struct iwl_lq_sta *lq_sta, 3034 struct ieee80211_sta_ht_cap *ht_cap) 3035 { 3036 /* active_siso_rate mask includes 9 MBits (bit 5), 3037 * and CCK (bits 0-3), supp_rates[] does not; 3038 * shift to convert format, force 9 MBits off. 3039 */ 3040 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3041 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3042 lq_sta->active_siso_rate &= ~((u16)0x2); 3043 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3044 3045 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3046 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3047 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3048 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3049 3050 if (mvm->cfg->ht_params->ldpc && 3051 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3052 lq_sta->ldpc = true; 3053 3054 if (mvm->cfg->ht_params->stbc && 3055 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3056 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3057 lq_sta->stbc_capable = true; 3058 3059 lq_sta->is_vht = false; 3060 } 3061 3062 static void rs_vht_init(struct iwl_mvm *mvm, 3063 struct ieee80211_sta *sta, 3064 struct iwl_lq_sta *lq_sta, 3065 struct ieee80211_sta_vht_cap *vht_cap) 3066 { 3067 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3068 3069 if (mvm->cfg->ht_params->ldpc && 3070 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3071 lq_sta->ldpc = true; 3072 3073 if (mvm->cfg->ht_params->stbc && 3074 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3075 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3076 lq_sta->stbc_capable = true; 3077 3078 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3079 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3080 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3081 lq_sta->bfer_capable = true; 3082 3083 lq_sta->is_vht = true; 3084 } 3085 3086 #ifdef CONFIG_IWLWIFI_DEBUGFS 3087 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3088 { 3089 spin_lock_bh(&mvm->drv_stats_lock); 3090 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3091 spin_unlock_bh(&mvm->drv_stats_lock); 3092 } 3093 3094 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3095 { 3096 u8 nss = 0; 3097 3098 spin_lock(&mvm->drv_stats_lock); 3099 3100 if (agg) 3101 mvm->drv_rx_stats.agg_frames++; 3102 3103 mvm->drv_rx_stats.success_frames++; 3104 3105 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3106 case RATE_MCS_CHAN_WIDTH_20: 3107 mvm->drv_rx_stats.bw_20_frames++; 3108 break; 3109 case RATE_MCS_CHAN_WIDTH_40: 3110 mvm->drv_rx_stats.bw_40_frames++; 3111 break; 3112 case RATE_MCS_CHAN_WIDTH_80: 3113 mvm->drv_rx_stats.bw_80_frames++; 3114 break; 3115 case RATE_MCS_CHAN_WIDTH_160: 3116 mvm->drv_rx_stats.bw_160_frames++; 3117 break; 3118 default: 3119 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3120 } 3121 3122 if (rate & RATE_MCS_HT_MSK) { 3123 mvm->drv_rx_stats.ht_frames++; 3124 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3125 } else if (rate & RATE_MCS_VHT_MSK) { 3126 mvm->drv_rx_stats.vht_frames++; 3127 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3128 RATE_VHT_MCS_NSS_POS) + 1; 3129 } else { 3130 mvm->drv_rx_stats.legacy_frames++; 3131 } 3132 3133 if (nss == 1) 3134 mvm->drv_rx_stats.siso_frames++; 3135 else if (nss == 2) 3136 mvm->drv_rx_stats.mimo2_frames++; 3137 3138 if (rate & RATE_MCS_SGI_MSK) 3139 mvm->drv_rx_stats.sgi_frames++; 3140 else 3141 mvm->drv_rx_stats.ngi_frames++; 3142 3143 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3144 mvm->drv_rx_stats.last_frame_idx = 3145 (mvm->drv_rx_stats.last_frame_idx + 1) % 3146 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3147 3148 spin_unlock(&mvm->drv_stats_lock); 3149 } 3150 #endif 3151 3152 /* 3153 * Called after adding a new station to initialize rate scaling 3154 */ 3155 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3156 enum nl80211_band band, bool update) 3157 { 3158 int i, j; 3159 struct ieee80211_hw *hw = mvm->hw; 3160 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3161 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3162 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3163 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3164 struct ieee80211_supported_band *sband; 3165 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3166 3167 /* clear all non-persistent lq data */ 3168 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3169 3170 sband = hw->wiphy->bands[band]; 3171 3172 lq_sta->lq.sta_id = mvmsta->sta_id; 3173 mvmsta->amsdu_enabled = 0; 3174 mvmsta->max_amsdu_len = sta->max_amsdu_len; 3175 3176 for (j = 0; j < LQ_SIZE; j++) 3177 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3178 3179 lq_sta->flush_timer = 0; 3180 lq_sta->last_tx = jiffies; 3181 3182 IWL_DEBUG_RATE(mvm, 3183 "LQ: *** rate scale station global init for station %d ***\n", 3184 mvmsta->sta_id); 3185 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3186 * the lowest or the highest rate.. Could consider using RSSI from 3187 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3188 * after assoc.. */ 3189 3190 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3191 lq_sta->band = sband->band; 3192 /* 3193 * active legacy rates as per supported rates bitmap 3194 */ 3195 supp = sta->supp_rates[sband->band]; 3196 lq_sta->active_legacy_rate = 0; 3197 for_each_set_bit(i, &supp, BITS_PER_LONG) 3198 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3199 3200 /* TODO: should probably account for rx_highest for both HT/VHT */ 3201 if (!vht_cap || !vht_cap->vht_supported) 3202 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3203 else 3204 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3205 3206 lq_sta->max_legacy_rate_idx = 3207 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3208 lq_sta->max_siso_rate_idx = 3209 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3210 lq_sta->max_mimo2_rate_idx = 3211 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3212 3213 IWL_DEBUG_RATE(mvm, 3214 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3215 lq_sta->active_legacy_rate, 3216 lq_sta->active_siso_rate, 3217 lq_sta->active_mimo2_rate, 3218 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3219 lq_sta->bfer_capable); 3220 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3221 lq_sta->max_legacy_rate_idx, 3222 lq_sta->max_siso_rate_idx, 3223 lq_sta->max_mimo2_rate_idx); 3224 3225 /* These values will be overridden later */ 3226 lq_sta->lq.single_stream_ant_msk = 3227 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3228 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3229 3230 /* as default allow aggregation for all tids */ 3231 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3232 lq_sta->is_agg = 0; 3233 #ifdef CONFIG_IWLWIFI_DEBUGFS 3234 iwl_mvm_reset_frame_stats(mvm); 3235 #endif 3236 rs_initialize_lq(mvm, sta, lq_sta, band, update); 3237 } 3238 3239 static void rs_drv_rate_update(void *mvm_r, 3240 struct ieee80211_supported_band *sband, 3241 struct cfg80211_chan_def *chandef, 3242 struct ieee80211_sta *sta, 3243 void *priv_sta, u32 changed) 3244 { 3245 struct iwl_op_mode *op_mode = mvm_r; 3246 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3247 u8 tid; 3248 3249 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3250 return; 3251 3252 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3253 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3254 ieee80211_stop_tx_ba_session(sta, tid); 3255 3256 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3257 } 3258 3259 #ifdef CONFIG_MAC80211_DEBUGFS 3260 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3261 struct iwl_lq_cmd *lq_cmd, 3262 enum nl80211_band band, 3263 u32 ucode_rate) 3264 { 3265 struct rs_rate rate; 3266 int i; 3267 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3268 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3269 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3270 3271 for (i = 0; i < num_rates; i++) 3272 lq_cmd->rs_table[i] = ucode_rate_le32; 3273 3274 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3275 WARN_ON_ONCE(1); 3276 return; 3277 } 3278 3279 if (is_mimo(&rate)) 3280 lq_cmd->mimo_delim = num_rates - 1; 3281 else 3282 lq_cmd->mimo_delim = 0; 3283 3284 lq_cmd->reduced_tpc = 0; 3285 3286 if (num_of_ant(ant) == 1) 3287 lq_cmd->single_stream_ant_msk = ant; 3288 3289 if (!mvm->trans->cfg->gen2) 3290 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3291 else 3292 lq_cmd->agg_frame_cnt_limit = 3293 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3294 } 3295 #endif /* CONFIG_MAC80211_DEBUGFS */ 3296 3297 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3298 struct iwl_lq_sta *lq_sta, 3299 struct rs_rate *rate, 3300 __le32 *rs_table, int *rs_table_index, 3301 int num_rates, int num_retries, 3302 u8 valid_tx_ant, bool toggle_ant) 3303 { 3304 int i, j; 3305 __le32 ucode_rate; 3306 bool bottom_reached = false; 3307 int prev_rate_idx = rate->index; 3308 int end = LINK_QUAL_MAX_RETRY_NUM; 3309 int index = *rs_table_index; 3310 3311 for (i = 0; i < num_rates && index < end; i++) { 3312 for (j = 0; j < num_retries && index < end; j++, index++) { 3313 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3314 rate)); 3315 rs_table[index] = ucode_rate; 3316 if (toggle_ant) 3317 rs_toggle_antenna(valid_tx_ant, rate); 3318 } 3319 3320 prev_rate_idx = rate->index; 3321 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3322 if (bottom_reached && !is_legacy(rate)) 3323 break; 3324 } 3325 3326 if (!bottom_reached && !is_legacy(rate)) 3327 rate->index = prev_rate_idx; 3328 3329 *rs_table_index = index; 3330 } 3331 3332 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3333 * column the rate table should look like this: 3334 * 3335 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3336 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3337 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3338 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3339 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3340 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3341 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3342 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3343 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3344 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3345 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3346 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3347 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3348 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3349 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3350 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3351 */ 3352 static void rs_build_rates_table(struct iwl_mvm *mvm, 3353 struct ieee80211_sta *sta, 3354 struct iwl_lq_sta *lq_sta, 3355 const struct rs_rate *initial_rate) 3356 { 3357 struct rs_rate rate; 3358 int num_rates, num_retries, index = 0; 3359 u8 valid_tx_ant = 0; 3360 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3361 bool toggle_ant = false; 3362 u32 color; 3363 3364 memcpy(&rate, initial_rate, sizeof(rate)); 3365 3366 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3367 3368 /* TODO: remove old API when min FW API hits 14 */ 3369 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3370 rs_stbc_allow(mvm, sta, lq_sta)) 3371 rate.stbc = true; 3372 3373 if (is_siso(&rate)) { 3374 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3375 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3376 } else if (is_mimo(&rate)) { 3377 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3378 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3379 } else { 3380 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3381 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3382 toggle_ant = true; 3383 } 3384 3385 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3386 num_rates, num_retries, valid_tx_ant, 3387 toggle_ant); 3388 3389 rs_get_lower_rate_down_column(lq_sta, &rate); 3390 3391 if (is_siso(&rate)) { 3392 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3393 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3394 lq_cmd->mimo_delim = index; 3395 } else if (is_legacy(&rate)) { 3396 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3397 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3398 } else { 3399 WARN_ON_ONCE(1); 3400 } 3401 3402 toggle_ant = true; 3403 3404 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3405 num_rates, num_retries, valid_tx_ant, 3406 toggle_ant); 3407 3408 rs_get_lower_rate_down_column(lq_sta, &rate); 3409 3410 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3411 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3412 3413 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3414 num_rates, num_retries, valid_tx_ant, 3415 toggle_ant); 3416 3417 /* update the color of the LQ command (as a counter at bits 1-3) */ 3418 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3419 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3420 } 3421 3422 struct rs_bfer_active_iter_data { 3423 struct ieee80211_sta *exclude_sta; 3424 struct iwl_mvm_sta *bfer_mvmsta; 3425 }; 3426 3427 static void rs_bfer_active_iter(void *_data, 3428 struct ieee80211_sta *sta) 3429 { 3430 struct rs_bfer_active_iter_data *data = _data; 3431 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3432 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3433 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3434 3435 if (sta == data->exclude_sta) 3436 return; 3437 3438 /* The current sta has BFER allowed */ 3439 if (ss_params & LQ_SS_BFER_ALLOWED) { 3440 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3441 3442 data->bfer_mvmsta = mvmsta; 3443 } 3444 } 3445 3446 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3447 { 3448 int prio = -1; 3449 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3450 3451 switch (viftype) { 3452 case NL80211_IFTYPE_AP: 3453 case NL80211_IFTYPE_P2P_GO: 3454 prio = 3; 3455 break; 3456 case NL80211_IFTYPE_P2P_CLIENT: 3457 prio = 2; 3458 break; 3459 case NL80211_IFTYPE_STATION: 3460 prio = 1; 3461 break; 3462 default: 3463 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3464 prio = -1; 3465 } 3466 3467 return prio; 3468 } 3469 3470 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3471 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3472 struct iwl_mvm_sta *sta2) 3473 { 3474 int prio1 = rs_bfer_priority(sta1); 3475 int prio2 = rs_bfer_priority(sta2); 3476 3477 if (prio1 > prio2) 3478 return 1; 3479 if (prio1 < prio2) 3480 return -1; 3481 return 0; 3482 } 3483 3484 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3485 struct ieee80211_sta *sta, 3486 struct iwl_lq_sta *lq_sta, 3487 const struct rs_rate *initial_rate) 3488 { 3489 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3490 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3491 struct rs_bfer_active_iter_data data = { 3492 .exclude_sta = sta, 3493 .bfer_mvmsta = NULL, 3494 }; 3495 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3496 u32 ss_params = LQ_SS_PARAMS_VALID; 3497 3498 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3499 goto out; 3500 3501 #ifdef CONFIG_MAC80211_DEBUGFS 3502 /* Check if forcing the decision is configured. 3503 * Note that SISO is forced by not allowing STBC or BFER 3504 */ 3505 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3506 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3507 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3508 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3509 3510 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3511 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3512 lq_sta->pers.ss_force); 3513 goto out; 3514 } 3515 #endif 3516 3517 if (lq_sta->stbc_capable) 3518 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3519 3520 if (!lq_sta->bfer_capable) 3521 goto out; 3522 3523 ieee80211_iterate_stations_atomic(mvm->hw, 3524 rs_bfer_active_iter, 3525 &data); 3526 bfer_mvmsta = data.bfer_mvmsta; 3527 3528 /* This code is safe as it doesn't run concurrently for different 3529 * stations. This is guaranteed by the fact that calls to 3530 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3531 */ 3532 if (!bfer_mvmsta) { 3533 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3534 3535 ss_params |= LQ_SS_BFER_ALLOWED; 3536 goto out; 3537 } 3538 3539 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3540 bfer_mvmsta->sta_id); 3541 3542 /* Disallow BFER on another STA if active and we're a higher priority */ 3543 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3544 struct iwl_lq_cmd *bfersta_lq_cmd = 3545 &bfer_mvmsta->lq_sta.rs_drv.lq; 3546 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3547 3548 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3549 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3550 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3551 3552 ss_params |= LQ_SS_BFER_ALLOWED; 3553 IWL_DEBUG_RATE(mvm, 3554 "Lower priority BFER sta found (%d). Switch BFER\n", 3555 bfer_mvmsta->sta_id); 3556 } 3557 out: 3558 lq_cmd->ss_params = cpu_to_le32(ss_params); 3559 } 3560 3561 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3562 struct ieee80211_sta *sta, 3563 struct iwl_lq_sta *lq_sta, 3564 const struct rs_rate *initial_rate) 3565 { 3566 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3567 struct iwl_mvm_sta *mvmsta; 3568 struct iwl_mvm_vif *mvmvif; 3569 3570 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3571 lq_cmd->agg_time_limit = 3572 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3573 3574 #ifdef CONFIG_MAC80211_DEBUGFS 3575 if (lq_sta->pers.dbg_fixed_rate) { 3576 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3577 lq_sta->band, 3578 lq_sta->pers.dbg_fixed_rate); 3579 return; 3580 } 3581 #endif 3582 if (WARN_ON_ONCE(!sta || !initial_rate)) 3583 return; 3584 3585 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3586 3587 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3588 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3589 3590 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3591 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3592 3593 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3594 num_of_ant(initial_rate->ant) == 1) 3595 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3596 3597 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3598 3599 /* 3600 * In case of low latency, tell the firmware to leave a frame in the 3601 * Tx Fifo so that it can start a transaction in the same TxOP. This 3602 * basically allows the firmware to send bursts. 3603 */ 3604 if (iwl_mvm_vif_low_latency(mvmvif)) 3605 lq_cmd->agg_frame_cnt_limit--; 3606 3607 if (mvmsta->vif->p2p) 3608 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3609 3610 lq_cmd->agg_time_limit = 3611 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3612 } 3613 3614 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3615 { 3616 return hw->priv; 3617 } 3618 3619 /* rate scale requires free function to be implemented */ 3620 static void rs_free(void *mvm_rate) 3621 { 3622 return; 3623 } 3624 3625 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3626 { 3627 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3628 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3629 3630 IWL_DEBUG_RATE(mvm, "enter\n"); 3631 IWL_DEBUG_RATE(mvm, "leave\n"); 3632 } 3633 3634 #ifdef CONFIG_MAC80211_DEBUGFS 3635 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3636 { 3637 3638 char *type, *bw; 3639 u8 mcs = 0, nss = 0; 3640 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3641 3642 if (!(rate & RATE_MCS_HT_MSK) && 3643 !(rate & RATE_MCS_VHT_MSK) && 3644 !(rate & RATE_MCS_HE_MSK)) { 3645 int index = iwl_hwrate_to_plcp_idx(rate); 3646 3647 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3648 rs_pretty_ant(ant), 3649 index == IWL_RATE_INVALID ? "BAD" : 3650 iwl_rate_mcs[index].mbps); 3651 } 3652 3653 if (rate & RATE_MCS_VHT_MSK) { 3654 type = "VHT"; 3655 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3656 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3657 >> RATE_VHT_MCS_NSS_POS) + 1; 3658 } else if (rate & RATE_MCS_HT_MSK) { 3659 type = "HT"; 3660 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3661 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3662 >> RATE_HT_MCS_NSS_POS) + 1; 3663 } else if (rate & RATE_MCS_HE_MSK) { 3664 type = "HE"; 3665 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3666 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3667 >> RATE_VHT_MCS_NSS_POS) + 1; 3668 } else { 3669 type = "Unknown"; /* shouldn't happen */ 3670 } 3671 3672 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3673 case RATE_MCS_CHAN_WIDTH_20: 3674 bw = "20Mhz"; 3675 break; 3676 case RATE_MCS_CHAN_WIDTH_40: 3677 bw = "40Mhz"; 3678 break; 3679 case RATE_MCS_CHAN_WIDTH_80: 3680 bw = "80Mhz"; 3681 break; 3682 case RATE_MCS_CHAN_WIDTH_160: 3683 bw = "160Mhz"; 3684 break; 3685 default: 3686 bw = "BAD BW"; 3687 } 3688 3689 return scnprintf(buf, bufsz, 3690 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3691 type, rs_pretty_ant(ant), bw, mcs, nss, 3692 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3693 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3694 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3695 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3696 } 3697 3698 /** 3699 * Program the device to use fixed rate for frame transmit 3700 * This is for debugging/testing only 3701 * once the device start use fixed rate, we need to reload the module 3702 * to being back the normal operation. 3703 */ 3704 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3705 struct iwl_lq_sta *lq_sta) 3706 { 3707 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3708 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3709 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3710 3711 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3712 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3713 3714 if (lq_sta->pers.dbg_fixed_rate) { 3715 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3716 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3717 } 3718 } 3719 3720 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3721 const char __user *user_buf, size_t count, loff_t *ppos) 3722 { 3723 struct iwl_lq_sta *lq_sta = file->private_data; 3724 struct iwl_mvm *mvm; 3725 char buf[64]; 3726 size_t buf_size; 3727 u32 parsed_rate; 3728 3729 mvm = lq_sta->pers.drv; 3730 memset(buf, 0, sizeof(buf)); 3731 buf_size = min(count, sizeof(buf) - 1); 3732 if (copy_from_user(buf, user_buf, buf_size)) 3733 return -EFAULT; 3734 3735 if (sscanf(buf, "%x", &parsed_rate) == 1) 3736 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3737 else 3738 lq_sta->pers.dbg_fixed_rate = 0; 3739 3740 rs_program_fix_rate(mvm, lq_sta); 3741 3742 return count; 3743 } 3744 3745 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3746 char __user *user_buf, size_t count, loff_t *ppos) 3747 { 3748 char *buff; 3749 int desc = 0; 3750 int i = 0; 3751 ssize_t ret; 3752 static const size_t bufsz = 2048; 3753 3754 struct iwl_lq_sta *lq_sta = file->private_data; 3755 struct iwl_mvm_sta *mvmsta = 3756 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3757 struct iwl_mvm *mvm; 3758 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3759 struct rs_rate *rate = &tbl->rate; 3760 u32 ss_params; 3761 3762 mvm = lq_sta->pers.drv; 3763 buff = kmalloc(bufsz, GFP_KERNEL); 3764 if (!buff) 3765 return -ENOMEM; 3766 3767 desc += scnprintf(buff + desc, bufsz - desc, 3768 "sta_id %d\n", lq_sta->lq.sta_id); 3769 desc += scnprintf(buff + desc, bufsz - desc, 3770 "failed=%d success=%d rate=0%lX\n", 3771 lq_sta->total_failed, lq_sta->total_success, 3772 lq_sta->active_legacy_rate); 3773 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3774 lq_sta->pers.dbg_fixed_rate); 3775 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3776 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3777 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3778 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3779 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3780 (is_legacy(rate)) ? "legacy" : 3781 is_vht(rate) ? "VHT" : "HT"); 3782 if (!is_legacy(rate)) { 3783 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3784 (is_siso(rate)) ? "SISO" : "MIMO2"); 3785 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3786 (is_ht20(rate)) ? "20MHz" : 3787 (is_ht40(rate)) ? "40MHz" : 3788 (is_ht80(rate)) ? "80MHz" : 3789 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3790 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3791 (rate->sgi) ? "SGI" : "NGI", 3792 (rate->ldpc) ? "LDPC" : "BCC", 3793 (lq_sta->is_agg) ? "AGG on" : "", 3794 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3795 } 3796 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3797 lq_sta->last_rate_n_flags); 3798 desc += scnprintf(buff + desc, bufsz - desc, 3799 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3800 lq_sta->lq.flags, 3801 lq_sta->lq.mimo_delim, 3802 lq_sta->lq.single_stream_ant_msk, 3803 lq_sta->lq.dual_stream_ant_msk); 3804 3805 desc += scnprintf(buff + desc, bufsz - desc, 3806 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3807 le16_to_cpu(lq_sta->lq.agg_time_limit), 3808 lq_sta->lq.agg_disable_start_th, 3809 lq_sta->lq.agg_frame_cnt_limit); 3810 3811 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3812 lq_sta->lq.reduced_tpc); 3813 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3814 desc += scnprintf(buff + desc, bufsz - desc, 3815 "single stream params: %s%s%s%s\n", 3816 (ss_params & LQ_SS_PARAMS_VALID) ? 3817 "VALID" : "INVALID", 3818 (ss_params & LQ_SS_BFER_ALLOWED) ? 3819 ", BFER" : "", 3820 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3821 ", STBC" : "", 3822 (ss_params & LQ_SS_FORCE) ? 3823 ", FORCE" : ""); 3824 desc += scnprintf(buff + desc, bufsz - desc, 3825 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3826 lq_sta->lq.initial_rate_index[0], 3827 lq_sta->lq.initial_rate_index[1], 3828 lq_sta->lq.initial_rate_index[2], 3829 lq_sta->lq.initial_rate_index[3]); 3830 3831 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3832 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3833 3834 desc += scnprintf(buff + desc, bufsz - desc, 3835 " rate[%d] 0x%X ", i, r); 3836 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3837 } 3838 3839 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3840 kfree(buff); 3841 return ret; 3842 } 3843 3844 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3845 .write = rs_sta_dbgfs_scale_table_write, 3846 .read = rs_sta_dbgfs_scale_table_read, 3847 .open = simple_open, 3848 .llseek = default_llseek, 3849 }; 3850 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3851 char __user *user_buf, size_t count, loff_t *ppos) 3852 { 3853 char *buff; 3854 int desc = 0; 3855 int i, j; 3856 ssize_t ret; 3857 struct iwl_scale_tbl_info *tbl; 3858 struct rs_rate *rate; 3859 struct iwl_lq_sta *lq_sta = file->private_data; 3860 3861 buff = kmalloc(1024, GFP_KERNEL); 3862 if (!buff) 3863 return -ENOMEM; 3864 3865 for (i = 0; i < LQ_SIZE; i++) { 3866 tbl = &(lq_sta->lq_info[i]); 3867 rate = &tbl->rate; 3868 desc += sprintf(buff+desc, 3869 "%s type=%d SGI=%d BW=%s DUP=0\n" 3870 "index=%d\n", 3871 lq_sta->active_tbl == i ? "*" : "x", 3872 rate->type, 3873 rate->sgi, 3874 is_ht20(rate) ? "20MHz" : 3875 is_ht40(rate) ? "40MHz" : 3876 is_ht80(rate) ? "80MHz" : 3877 is_ht160(rate) ? "160MHz" : "ERR", 3878 rate->index); 3879 for (j = 0; j < IWL_RATE_COUNT; j++) { 3880 desc += sprintf(buff+desc, 3881 "counter=%d success=%d %%=%d\n", 3882 tbl->win[j].counter, 3883 tbl->win[j].success_counter, 3884 tbl->win[j].success_ratio); 3885 } 3886 } 3887 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3888 kfree(buff); 3889 return ret; 3890 } 3891 3892 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3893 .read = rs_sta_dbgfs_stats_table_read, 3894 .open = simple_open, 3895 .llseek = default_llseek, 3896 }; 3897 3898 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3899 char __user *user_buf, 3900 size_t count, loff_t *ppos) 3901 { 3902 static const char * const column_name[] = { 3903 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3904 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3905 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3906 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3907 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3908 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3909 [RS_COLUMN_MIMO2] = "MIMO2", 3910 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3911 }; 3912 3913 static const char * const rate_name[] = { 3914 [IWL_RATE_1M_INDEX] = "1M", 3915 [IWL_RATE_2M_INDEX] = "2M", 3916 [IWL_RATE_5M_INDEX] = "5.5M", 3917 [IWL_RATE_11M_INDEX] = "11M", 3918 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3919 [IWL_RATE_9M_INDEX] = "9M", 3920 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3921 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3922 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3923 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3924 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3925 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3926 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3927 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3928 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3929 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3930 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3931 }; 3932 3933 char *buff, *pos, *endpos; 3934 int col, rate; 3935 ssize_t ret; 3936 struct iwl_lq_sta *lq_sta = file->private_data; 3937 struct rs_rate_stats *stats; 3938 static const size_t bufsz = 1024; 3939 3940 buff = kmalloc(bufsz, GFP_KERNEL); 3941 if (!buff) 3942 return -ENOMEM; 3943 3944 pos = buff; 3945 endpos = pos + bufsz; 3946 3947 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3948 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3949 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3950 pos += scnprintf(pos, endpos - pos, "\n"); 3951 3952 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3953 pos += scnprintf(pos, endpos - pos, 3954 "%s,", column_name[col]); 3955 3956 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3957 stats = &(lq_sta->pers.tx_stats[col][rate]); 3958 pos += scnprintf(pos, endpos - pos, 3959 "%llu/%llu,", 3960 stats->success, 3961 stats->total); 3962 } 3963 pos += scnprintf(pos, endpos - pos, "\n"); 3964 } 3965 3966 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3967 kfree(buff); 3968 return ret; 3969 } 3970 3971 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3972 const char __user *user_buf, 3973 size_t count, loff_t *ppos) 3974 { 3975 struct iwl_lq_sta *lq_sta = file->private_data; 3976 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3977 3978 return count; 3979 } 3980 3981 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3982 .read = rs_sta_dbgfs_drv_tx_stats_read, 3983 .write = rs_sta_dbgfs_drv_tx_stats_write, 3984 .open = simple_open, 3985 .llseek = default_llseek, 3986 }; 3987 3988 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3989 char __user *user_buf, 3990 size_t count, loff_t *ppos) 3991 { 3992 struct iwl_lq_sta *lq_sta = file->private_data; 3993 char buf[12]; 3994 int bufsz = sizeof(buf); 3995 int pos = 0; 3996 static const char * const ss_force_name[] = { 3997 [RS_SS_FORCE_NONE] = "none", 3998 [RS_SS_FORCE_STBC] = "stbc", 3999 [RS_SS_FORCE_BFER] = "bfer", 4000 [RS_SS_FORCE_SISO] = "siso", 4001 }; 4002 4003 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4004 ss_force_name[lq_sta->pers.ss_force]); 4005 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4006 } 4007 4008 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4009 size_t count, loff_t *ppos) 4010 { 4011 struct iwl_mvm *mvm = lq_sta->pers.drv; 4012 int ret = 0; 4013 4014 if (!strncmp("none", buf, 4)) { 4015 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4016 } else if (!strncmp("siso", buf, 4)) { 4017 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4018 } else if (!strncmp("stbc", buf, 4)) { 4019 if (lq_sta->stbc_capable) { 4020 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4021 } else { 4022 IWL_ERR(mvm, 4023 "can't force STBC. peer doesn't support\n"); 4024 ret = -EINVAL; 4025 } 4026 } else if (!strncmp("bfer", buf, 4)) { 4027 if (lq_sta->bfer_capable) { 4028 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4029 } else { 4030 IWL_ERR(mvm, 4031 "can't force BFER. peer doesn't support\n"); 4032 ret = -EINVAL; 4033 } 4034 } else { 4035 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4036 ret = -EINVAL; 4037 } 4038 return ret ?: count; 4039 } 4040 4041 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4042 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4043 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4044 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 4045 &iwl_dbgfs_##name##_ops)) \ 4046 goto err; \ 4047 } while (0) 4048 4049 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4050 4051 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4052 struct dentry *dir) 4053 { 4054 struct iwl_lq_sta *lq_sta = priv_sta; 4055 struct iwl_mvm_sta *mvmsta; 4056 4057 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4058 4059 if (!mvmsta->vif) 4060 return; 4061 4062 debugfs_create_file("rate_scale_table", 0600, dir, 4063 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4064 debugfs_create_file("rate_stats_table", 0400, dir, 4065 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4066 debugfs_create_file("drv_tx_stats", 0600, dir, 4067 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4068 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4069 &lq_sta->tx_agg_tid_en); 4070 debugfs_create_u8("reduced_tpc", 0600, dir, 4071 &lq_sta->pers.dbg_fixed_txp_reduction); 4072 4073 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4074 return; 4075 err: 4076 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4077 } 4078 4079 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta) 4080 { 4081 } 4082 #endif 4083 4084 /* 4085 * Initialization of rate scaling information is done by driver after 4086 * the station is added. Since mac80211 calls this function before a 4087 * station is added we ignore it. 4088 */ 4089 static void rs_rate_init_ops(void *mvm_r, 4090 struct ieee80211_supported_band *sband, 4091 struct cfg80211_chan_def *chandef, 4092 struct ieee80211_sta *sta, void *mvm_sta) 4093 { 4094 } 4095 4096 /* ops for rate scaling implemented in the driver */ 4097 static const struct rate_control_ops rs_mvm_ops_drv = { 4098 .name = RS_NAME, 4099 .tx_status = rs_drv_mac80211_tx_status, 4100 .get_rate = rs_drv_get_rate, 4101 .rate_init = rs_rate_init_ops, 4102 .alloc = rs_alloc, 4103 .free = rs_free, 4104 .alloc_sta = rs_drv_alloc_sta, 4105 .free_sta = rs_free_sta, 4106 .rate_update = rs_drv_rate_update, 4107 #ifdef CONFIG_MAC80211_DEBUGFS 4108 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4109 .remove_sta_debugfs = rs_remove_sta_debugfs, 4110 #endif 4111 }; 4112 4113 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4114 enum nl80211_band band, bool update) 4115 { 4116 if (iwl_mvm_has_tlc_offload(mvm)) 4117 rs_fw_rate_init(mvm, sta, band, update); 4118 else 4119 rs_drv_rate_init(mvm, sta, band, update); 4120 } 4121 4122 int iwl_mvm_rate_control_register(void) 4123 { 4124 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4125 } 4126 4127 void iwl_mvm_rate_control_unregister(void) 4128 { 4129 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4130 } 4131 4132 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4133 bool enable) 4134 { 4135 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4136 4137 lockdep_assert_held(&mvm->mutex); 4138 4139 if (enable) { 4140 if (mvmsta->tx_protection == 0) 4141 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4142 mvmsta->tx_protection++; 4143 } else { 4144 mvmsta->tx_protection--; 4145 if (mvmsta->tx_protection == 0) 4146 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4147 } 4148 4149 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4150 } 4151 4152 /** 4153 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4154 * @mvmsta: The station 4155 * @enable: Enable Tx protection? 4156 */ 4157 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4158 bool enable) 4159 { 4160 if (iwl_mvm_has_tlc_offload(mvm)) 4161 return rs_fw_tx_protection(mvm, mvmsta, enable); 4162 else 4163 return rs_drv_tx_protection(mvm, mvmsta, enable); 4164 } 4165