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 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_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_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 struct iwl_mvm_sta *mvmsta; 165 struct iwl_mvm_vif *mvmvif; 166 167 if (!sta->ht_cap.ht_supported) 168 return false; 169 170 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 171 return false; 172 173 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 174 return false; 175 176 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 177 return false; 178 179 mvmsta = iwl_mvm_sta_from_mac80211(sta); 180 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 181 182 if (mvm->nvm_data->sku_cap_mimo_disabled) 183 return false; 184 185 return true; 186 } 187 188 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 189 struct rs_rate *rate, 190 const struct rs_tx_column *next_col) 191 { 192 if (!sta->ht_cap.ht_supported) 193 return false; 194 195 return true; 196 } 197 198 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 199 struct rs_rate *rate, 200 const struct rs_tx_column *next_col) 201 { 202 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 203 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 204 205 if (is_ht20(rate) && (ht_cap->cap & 206 IEEE80211_HT_CAP_SGI_20)) 207 return true; 208 if (is_ht40(rate) && (ht_cap->cap & 209 IEEE80211_HT_CAP_SGI_40)) 210 return true; 211 if (is_ht80(rate) && (vht_cap->cap & 212 IEEE80211_VHT_CAP_SHORT_GI_80)) 213 return true; 214 215 return false; 216 } 217 218 static const struct rs_tx_column rs_tx_columns[] = { 219 [RS_COLUMN_LEGACY_ANT_A] = { 220 .mode = RS_LEGACY, 221 .ant = ANT_A, 222 .next_columns = { 223 RS_COLUMN_LEGACY_ANT_B, 224 RS_COLUMN_SISO_ANT_A, 225 RS_COLUMN_MIMO2, 226 RS_COLUMN_INVALID, 227 RS_COLUMN_INVALID, 228 RS_COLUMN_INVALID, 229 RS_COLUMN_INVALID, 230 }, 231 .checks = { 232 rs_ant_allow, 233 }, 234 }, 235 [RS_COLUMN_LEGACY_ANT_B] = { 236 .mode = RS_LEGACY, 237 .ant = ANT_B, 238 .next_columns = { 239 RS_COLUMN_LEGACY_ANT_A, 240 RS_COLUMN_SISO_ANT_B, 241 RS_COLUMN_MIMO2, 242 RS_COLUMN_INVALID, 243 RS_COLUMN_INVALID, 244 RS_COLUMN_INVALID, 245 RS_COLUMN_INVALID, 246 }, 247 .checks = { 248 rs_ant_allow, 249 }, 250 }, 251 [RS_COLUMN_SISO_ANT_A] = { 252 .mode = RS_SISO, 253 .ant = ANT_A, 254 .next_columns = { 255 RS_COLUMN_SISO_ANT_B, 256 RS_COLUMN_MIMO2, 257 RS_COLUMN_SISO_ANT_A_SGI, 258 RS_COLUMN_LEGACY_ANT_A, 259 RS_COLUMN_LEGACY_ANT_B, 260 RS_COLUMN_INVALID, 261 RS_COLUMN_INVALID, 262 }, 263 .checks = { 264 rs_siso_allow, 265 rs_ant_allow, 266 }, 267 }, 268 [RS_COLUMN_SISO_ANT_B] = { 269 .mode = RS_SISO, 270 .ant = ANT_B, 271 .next_columns = { 272 RS_COLUMN_SISO_ANT_A, 273 RS_COLUMN_MIMO2, 274 RS_COLUMN_SISO_ANT_B_SGI, 275 RS_COLUMN_LEGACY_ANT_A, 276 RS_COLUMN_LEGACY_ANT_B, 277 RS_COLUMN_INVALID, 278 RS_COLUMN_INVALID, 279 }, 280 .checks = { 281 rs_siso_allow, 282 rs_ant_allow, 283 }, 284 }, 285 [RS_COLUMN_SISO_ANT_A_SGI] = { 286 .mode = RS_SISO, 287 .ant = ANT_A, 288 .sgi = true, 289 .next_columns = { 290 RS_COLUMN_SISO_ANT_B_SGI, 291 RS_COLUMN_MIMO2_SGI, 292 RS_COLUMN_SISO_ANT_A, 293 RS_COLUMN_LEGACY_ANT_A, 294 RS_COLUMN_LEGACY_ANT_B, 295 RS_COLUMN_INVALID, 296 RS_COLUMN_INVALID, 297 }, 298 .checks = { 299 rs_siso_allow, 300 rs_ant_allow, 301 rs_sgi_allow, 302 }, 303 }, 304 [RS_COLUMN_SISO_ANT_B_SGI] = { 305 .mode = RS_SISO, 306 .ant = ANT_B, 307 .sgi = true, 308 .next_columns = { 309 RS_COLUMN_SISO_ANT_A_SGI, 310 RS_COLUMN_MIMO2_SGI, 311 RS_COLUMN_SISO_ANT_B, 312 RS_COLUMN_LEGACY_ANT_A, 313 RS_COLUMN_LEGACY_ANT_B, 314 RS_COLUMN_INVALID, 315 RS_COLUMN_INVALID, 316 }, 317 .checks = { 318 rs_siso_allow, 319 rs_ant_allow, 320 rs_sgi_allow, 321 }, 322 }, 323 [RS_COLUMN_MIMO2] = { 324 .mode = RS_MIMO2, 325 .ant = ANT_AB, 326 .next_columns = { 327 RS_COLUMN_SISO_ANT_A, 328 RS_COLUMN_MIMO2_SGI, 329 RS_COLUMN_LEGACY_ANT_A, 330 RS_COLUMN_LEGACY_ANT_B, 331 RS_COLUMN_INVALID, 332 RS_COLUMN_INVALID, 333 RS_COLUMN_INVALID, 334 }, 335 .checks = { 336 rs_mimo_allow, 337 }, 338 }, 339 [RS_COLUMN_MIMO2_SGI] = { 340 .mode = RS_MIMO2, 341 .ant = ANT_AB, 342 .sgi = true, 343 .next_columns = { 344 RS_COLUMN_SISO_ANT_A_SGI, 345 RS_COLUMN_MIMO2, 346 RS_COLUMN_LEGACY_ANT_A, 347 RS_COLUMN_LEGACY_ANT_B, 348 RS_COLUMN_INVALID, 349 RS_COLUMN_INVALID, 350 RS_COLUMN_INVALID, 351 }, 352 .checks = { 353 rs_mimo_allow, 354 rs_sgi_allow, 355 }, 356 }, 357 }; 358 359 static inline u8 rs_extract_rate(u32 rate_n_flags) 360 { 361 /* also works for HT because bits 7:6 are zero there */ 362 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 363 } 364 365 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 366 { 367 int idx = 0; 368 369 if (rate_n_flags & RATE_MCS_HT_MSK) { 370 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 371 idx += IWL_RATE_MCS_0_INDEX; 372 373 /* skip 9M not supported in HT*/ 374 if (idx >= IWL_RATE_9M_INDEX) 375 idx += 1; 376 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 377 return idx; 378 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 379 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 380 idx += IWL_RATE_MCS_0_INDEX; 381 382 /* skip 9M not supported in VHT*/ 383 if (idx >= IWL_RATE_9M_INDEX) 384 idx++; 385 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 386 return idx; 387 } else { 388 /* legacy rate format, search for match in table */ 389 390 u8 legacy_rate = rs_extract_rate(rate_n_flags); 391 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 392 if (iwl_rates[idx].plcp == legacy_rate) 393 return idx; 394 } 395 396 return IWL_RATE_INVALID; 397 } 398 399 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 400 struct ieee80211_sta *sta, 401 struct iwl_lq_sta *lq_sta, 402 int tid); 403 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 404 struct ieee80211_sta *sta, 405 struct iwl_lq_sta *lq_sta, 406 const struct rs_rate *initial_rate); 407 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 408 409 /** 410 * The following tables contain the expected throughput metrics for all rates 411 * 412 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 413 * 414 * where invalid entries are zeros. 415 * 416 * CCK rates are only valid in legacy table and will only be used in G 417 * (2.4 GHz) band. 418 */ 419 420 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 421 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 422 }; 423 424 /* Expected TpT tables. 4 indexes: 425 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 426 */ 427 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 428 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 429 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 430 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 431 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 432 }; 433 434 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 435 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 436 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 437 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 438 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 439 }; 440 441 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 442 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 443 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 444 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 445 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 446 }; 447 448 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 449 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 450 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 451 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 452 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 453 }; 454 455 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 456 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 457 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 458 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 459 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 460 }; 461 462 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 463 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 464 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 465 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 466 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 467 }; 468 469 /* mbps, mcs */ 470 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 471 { "1", "BPSK DSSS"}, 472 { "2", "QPSK DSSS"}, 473 {"5.5", "BPSK CCK"}, 474 { "11", "QPSK CCK"}, 475 { "6", "BPSK 1/2"}, 476 { "9", "BPSK 1/2"}, 477 { "12", "QPSK 1/2"}, 478 { "18", "QPSK 3/4"}, 479 { "24", "16QAM 1/2"}, 480 { "36", "16QAM 3/4"}, 481 { "48", "64QAM 2/3"}, 482 { "54", "64QAM 3/4"}, 483 { "60", "64QAM 5/6"}, 484 }; 485 486 #define MCS_INDEX_PER_STREAM (8) 487 488 static const char *rs_pretty_ant(u8 ant) 489 { 490 static const char * const ant_name[] = { 491 [ANT_NONE] = "None", 492 [ANT_A] = "A", 493 [ANT_B] = "B", 494 [ANT_AB] = "AB", 495 [ANT_C] = "C", 496 [ANT_AC] = "AC", 497 [ANT_BC] = "BC", 498 [ANT_ABC] = "ABC", 499 }; 500 501 if (ant > ANT_ABC) 502 return "UNKNOWN"; 503 504 return ant_name[ant]; 505 } 506 507 static const char *rs_pretty_lq_type(enum iwl_table_type type) 508 { 509 static const char * const lq_types[] = { 510 [LQ_NONE] = "NONE", 511 [LQ_LEGACY_A] = "LEGACY_A", 512 [LQ_LEGACY_G] = "LEGACY_G", 513 [LQ_HT_SISO] = "HT SISO", 514 [LQ_HT_MIMO2] = "HT MIMO", 515 [LQ_VHT_SISO] = "VHT SISO", 516 [LQ_VHT_MIMO2] = "VHT MIMO", 517 }; 518 519 if (type < LQ_NONE || type >= LQ_MAX) 520 return "UNKNOWN"; 521 522 return lq_types[type]; 523 } 524 525 static char *rs_pretty_rate(const struct rs_rate *rate) 526 { 527 static char buf[40]; 528 static const char * const legacy_rates[] = { 529 [IWL_RATE_1M_INDEX] = "1M", 530 [IWL_RATE_2M_INDEX] = "2M", 531 [IWL_RATE_5M_INDEX] = "5.5M", 532 [IWL_RATE_11M_INDEX] = "11M", 533 [IWL_RATE_6M_INDEX] = "6M", 534 [IWL_RATE_9M_INDEX] = "9M", 535 [IWL_RATE_12M_INDEX] = "12M", 536 [IWL_RATE_18M_INDEX] = "18M", 537 [IWL_RATE_24M_INDEX] = "24M", 538 [IWL_RATE_36M_INDEX] = "36M", 539 [IWL_RATE_48M_INDEX] = "48M", 540 [IWL_RATE_54M_INDEX] = "54M", 541 }; 542 static const char *const ht_vht_rates[] = { 543 [IWL_RATE_MCS_0_INDEX] = "MCS0", 544 [IWL_RATE_MCS_1_INDEX] = "MCS1", 545 [IWL_RATE_MCS_2_INDEX] = "MCS2", 546 [IWL_RATE_MCS_3_INDEX] = "MCS3", 547 [IWL_RATE_MCS_4_INDEX] = "MCS4", 548 [IWL_RATE_MCS_5_INDEX] = "MCS5", 549 [IWL_RATE_MCS_6_INDEX] = "MCS6", 550 [IWL_RATE_MCS_7_INDEX] = "MCS7", 551 [IWL_RATE_MCS_8_INDEX] = "MCS8", 552 [IWL_RATE_MCS_9_INDEX] = "MCS9", 553 }; 554 const char *rate_str; 555 556 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 557 rate_str = legacy_rates[rate->index]; 558 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 559 (rate->index <= IWL_RATE_MCS_9_INDEX)) 560 rate_str = ht_vht_rates[rate->index]; 561 else 562 rate_str = "BAD_RATE"; 563 564 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 565 rs_pretty_ant(rate->ant), rate_str); 566 return buf; 567 } 568 569 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 570 const char *prefix) 571 { 572 IWL_DEBUG_RATE(mvm, 573 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 574 prefix, rs_pretty_rate(rate), rate->bw, 575 rate->sgi, rate->ldpc, rate->stbc); 576 } 577 578 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 579 { 580 window->data = 0; 581 window->success_counter = 0; 582 window->success_ratio = IWL_INVALID_VALUE; 583 window->counter = 0; 584 window->average_tpt = IWL_INVALID_VALUE; 585 } 586 587 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 588 struct iwl_scale_tbl_info *tbl) 589 { 590 int i; 591 592 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 593 for (i = 0; i < IWL_RATE_COUNT; i++) 594 rs_rate_scale_clear_window(&tbl->win[i]); 595 596 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 597 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 598 } 599 600 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 601 { 602 return (ant_type & valid_antenna) == ant_type; 603 } 604 605 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 606 struct iwl_lq_sta *lq_data, u8 tid, 607 struct ieee80211_sta *sta) 608 { 609 int ret = -EAGAIN; 610 611 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 612 sta->addr, tid); 613 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 614 if (ret == -EAGAIN) { 615 /* 616 * driver and mac80211 is out of sync 617 * this might be cause by reloading firmware 618 * stop the tx ba session here 619 */ 620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 621 tid); 622 ieee80211_stop_tx_ba_session(sta, tid); 623 } 624 return ret; 625 } 626 627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 628 struct iwl_lq_sta *lq_data, 629 struct ieee80211_sta *sta) 630 { 631 if (tid < IWL_MAX_TID_COUNT) 632 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 633 else 634 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 635 tid, IWL_MAX_TID_COUNT); 636 } 637 638 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 639 { 640 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 641 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 642 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 643 } 644 645 /* 646 * Static function to get the expected throughput from an iwl_scale_tbl_info 647 * that wraps a NULL pointer check 648 */ 649 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 650 { 651 if (tbl->expected_tpt) 652 return tbl->expected_tpt[rs_index]; 653 return 0; 654 } 655 656 /** 657 * rs_collect_tx_data - Update the success/failure sliding window 658 * 659 * We keep a sliding window of the last 62 packets transmitted 660 * at this rate. window->data contains the bitmask of successful 661 * packets. 662 */ 663 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 664 struct iwl_scale_tbl_info *tbl, 665 int scale_index, int attempts, int successes, 666 struct iwl_rate_scale_data *window) 667 { 668 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 669 s32 fail_count, tpt; 670 671 /* Get expected throughput */ 672 tpt = get_expected_tpt(tbl, scale_index); 673 674 /* 675 * Keep track of only the latest 62 tx frame attempts in this rate's 676 * history window; anything older isn't really relevant any more. 677 * If we have filled up the sliding window, drop the oldest attempt; 678 * if the oldest attempt (highest bit in bitmap) shows "success", 679 * subtract "1" from the success counter (this is the main reason 680 * we keep these bitmaps!). 681 */ 682 while (attempts > 0) { 683 if (window->counter >= IWL_RATE_MAX_WINDOW) { 684 /* remove earliest */ 685 window->counter = IWL_RATE_MAX_WINDOW - 1; 686 687 if (window->data & mask) { 688 window->data &= ~mask; 689 window->success_counter--; 690 } 691 } 692 693 /* Increment frames-attempted counter */ 694 window->counter++; 695 696 /* Shift bitmap by one frame to throw away oldest history */ 697 window->data <<= 1; 698 699 /* Mark the most recent #successes attempts as successful */ 700 if (successes > 0) { 701 window->success_counter++; 702 window->data |= 0x1; 703 successes--; 704 } 705 706 attempts--; 707 } 708 709 /* Calculate current success ratio, avoid divide-by-0! */ 710 if (window->counter > 0) 711 window->success_ratio = 128 * (100 * window->success_counter) 712 / window->counter; 713 else 714 window->success_ratio = IWL_INVALID_VALUE; 715 716 fail_count = window->counter - window->success_counter; 717 718 /* Calculate average throughput, if we have enough history. */ 719 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 720 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 721 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 722 else 723 window->average_tpt = IWL_INVALID_VALUE; 724 725 return 0; 726 } 727 728 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 729 struct iwl_lq_sta *lq_sta, 730 struct iwl_scale_tbl_info *tbl, 731 int scale_index, int attempts, int successes, 732 u8 reduced_txp) 733 { 734 struct iwl_rate_scale_data *window = NULL; 735 736 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 737 return -EINVAL; 738 739 window = &tbl->tpc_win[reduced_txp]; 740 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 741 window); 742 } 743 744 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 745 struct iwl_lq_sta *lq_sta, 746 struct iwl_scale_tbl_info *tbl, 747 int scale_index, int attempts, int successes) 748 { 749 struct iwl_rate_scale_data *window = NULL; 750 751 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 752 return -EINVAL; 753 754 if (tbl->column != RS_COLUMN_INVALID) { 755 struct lq_sta_pers *pers = &lq_sta->pers; 756 757 pers->tx_stats[tbl->column][scale_index].total += attempts; 758 pers->tx_stats[tbl->column][scale_index].success += successes; 759 } 760 761 /* Select window for current tx bit rate */ 762 window = &(tbl->win[scale_index]); 763 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 764 window); 765 } 766 767 /* Convert rs_rate object into ucode rate bitmask */ 768 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 769 struct rs_rate *rate) 770 { 771 u32 ucode_rate = 0; 772 int index = rate->index; 773 774 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 775 RATE_MCS_ANT_ABC_MSK); 776 777 if (is_legacy(rate)) { 778 ucode_rate |= iwl_rates[index].plcp; 779 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 780 ucode_rate |= RATE_MCS_CCK_MSK; 781 return ucode_rate; 782 } 783 784 if (is_ht(rate)) { 785 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 786 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 787 index = IWL_LAST_HT_RATE; 788 } 789 ucode_rate |= RATE_MCS_HT_MSK; 790 791 if (is_ht_siso(rate)) 792 ucode_rate |= iwl_rates[index].plcp_ht_siso; 793 else if (is_ht_mimo2(rate)) 794 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 795 else 796 WARN_ON_ONCE(1); 797 } else if (is_vht(rate)) { 798 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 799 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 800 index = IWL_LAST_VHT_RATE; 801 } 802 ucode_rate |= RATE_MCS_VHT_MSK; 803 if (is_vht_siso(rate)) 804 ucode_rate |= iwl_rates[index].plcp_vht_siso; 805 else if (is_vht_mimo2(rate)) 806 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 807 else 808 WARN_ON_ONCE(1); 809 810 } else { 811 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 812 } 813 814 if (is_siso(rate) && rate->stbc) { 815 /* To enable STBC we need to set both a flag and ANT_AB */ 816 ucode_rate |= RATE_MCS_ANT_AB_MSK; 817 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 818 } 819 820 ucode_rate |= rate->bw; 821 if (rate->sgi) 822 ucode_rate |= RATE_MCS_SGI_MSK; 823 if (rate->ldpc) 824 ucode_rate |= RATE_MCS_LDPC_MSK; 825 826 return ucode_rate; 827 } 828 829 /* Convert a ucode rate into an rs_rate object */ 830 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 831 enum ieee80211_band band, 832 struct rs_rate *rate) 833 { 834 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 835 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 836 u8 nss; 837 838 memset(rate, 0, sizeof(*rate)); 839 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 840 841 if (rate->index == IWL_RATE_INVALID) 842 return -EINVAL; 843 844 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 845 846 /* Legacy */ 847 if (!(ucode_rate & RATE_MCS_HT_MSK) && 848 !(ucode_rate & RATE_MCS_VHT_MSK)) { 849 if (num_of_ant == 1) { 850 if (band == IEEE80211_BAND_5GHZ) 851 rate->type = LQ_LEGACY_A; 852 else 853 rate->type = LQ_LEGACY_G; 854 } 855 856 return 0; 857 } 858 859 /* HT or VHT */ 860 if (ucode_rate & RATE_MCS_SGI_MSK) 861 rate->sgi = true; 862 if (ucode_rate & RATE_MCS_LDPC_MSK) 863 rate->ldpc = true; 864 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 865 rate->stbc = true; 866 if (ucode_rate & RATE_MCS_BF_MSK) 867 rate->bfer = true; 868 869 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 870 871 if (ucode_rate & RATE_MCS_HT_MSK) { 872 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 873 RATE_HT_MCS_NSS_POS) + 1; 874 875 if (nss == 1) { 876 rate->type = LQ_HT_SISO; 877 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 878 "stbc %d bfer %d", 879 rate->stbc, rate->bfer); 880 } else if (nss == 2) { 881 rate->type = LQ_HT_MIMO2; 882 WARN_ON_ONCE(num_of_ant != 2); 883 } else { 884 WARN_ON_ONCE(1); 885 } 886 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 887 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 888 RATE_VHT_MCS_NSS_POS) + 1; 889 890 if (nss == 1) { 891 rate->type = LQ_VHT_SISO; 892 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 893 "stbc %d bfer %d", 894 rate->stbc, rate->bfer); 895 } else if (nss == 2) { 896 rate->type = LQ_VHT_MIMO2; 897 WARN_ON_ONCE(num_of_ant != 2); 898 } else { 899 WARN_ON_ONCE(1); 900 } 901 } 902 903 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); 904 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 905 !is_vht(rate)); 906 907 return 0; 908 } 909 910 /* switch to another antenna/antennas and return 1 */ 911 /* if no other valid antenna found, return 0 */ 912 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 913 { 914 u8 new_ant_type; 915 916 if (!rate->ant || rate->ant > ANT_ABC) 917 return 0; 918 919 if (!rs_is_valid_ant(valid_ant, rate->ant)) 920 return 0; 921 922 new_ant_type = ant_toggle_lookup[rate->ant]; 923 924 while ((new_ant_type != rate->ant) && 925 !rs_is_valid_ant(valid_ant, new_ant_type)) 926 new_ant_type = ant_toggle_lookup[new_ant_type]; 927 928 if (new_ant_type == rate->ant) 929 return 0; 930 931 rate->ant = new_ant_type; 932 933 return 1; 934 } 935 936 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 937 struct rs_rate *rate) 938 { 939 if (is_legacy(rate)) 940 return lq_sta->active_legacy_rate; 941 else if (is_siso(rate)) 942 return lq_sta->active_siso_rate; 943 else if (is_mimo2(rate)) 944 return lq_sta->active_mimo2_rate; 945 946 WARN_ON_ONCE(1); 947 return 0; 948 } 949 950 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 951 int rate_type) 952 { 953 u8 high = IWL_RATE_INVALID; 954 u8 low = IWL_RATE_INVALID; 955 956 /* 802.11A or ht walks to the next literal adjacent rate in 957 * the rate table */ 958 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 959 int i; 960 u32 mask; 961 962 /* Find the previous rate that is in the rate mask */ 963 i = index - 1; 964 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 965 if (rate_mask & mask) { 966 low = i; 967 break; 968 } 969 } 970 971 /* Find the next rate that is in the rate mask */ 972 i = index + 1; 973 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 974 if (rate_mask & mask) { 975 high = i; 976 break; 977 } 978 } 979 980 return (high << 8) | low; 981 } 982 983 low = index; 984 while (low != IWL_RATE_INVALID) { 985 low = iwl_rates[low].prev_rs; 986 if (low == IWL_RATE_INVALID) 987 break; 988 if (rate_mask & (1 << low)) 989 break; 990 } 991 992 high = index; 993 while (high != IWL_RATE_INVALID) { 994 high = iwl_rates[high].next_rs; 995 if (high == IWL_RATE_INVALID) 996 break; 997 if (rate_mask & (1 << high)) 998 break; 999 } 1000 1001 return (high << 8) | low; 1002 } 1003 1004 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1005 struct rs_rate *rate) 1006 { 1007 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1008 } 1009 1010 /* Get the next supported lower rate in the current column. 1011 * Return true if bottom rate in the current column was reached 1012 */ 1013 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1014 struct rs_rate *rate) 1015 { 1016 u8 low; 1017 u16 high_low; 1018 u16 rate_mask; 1019 struct iwl_mvm *mvm = lq_sta->pers.drv; 1020 1021 rate_mask = rs_get_supported_rates(lq_sta, rate); 1022 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1023 rate->type); 1024 low = high_low & 0xff; 1025 1026 /* Bottom rate of column reached */ 1027 if (low == IWL_RATE_INVALID) 1028 return true; 1029 1030 rate->index = low; 1031 return false; 1032 } 1033 1034 /* Get the next rate to use following a column downgrade */ 1035 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1036 struct rs_rate *rate) 1037 { 1038 struct iwl_mvm *mvm = lq_sta->pers.drv; 1039 1040 if (is_legacy(rate)) { 1041 /* No column to downgrade from Legacy */ 1042 return; 1043 } else if (is_siso(rate)) { 1044 /* Downgrade to Legacy if we were in SISO */ 1045 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1046 rate->type = LQ_LEGACY_A; 1047 else 1048 rate->type = LQ_LEGACY_G; 1049 1050 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1051 1052 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1053 rate->index > IWL_RATE_MCS_9_INDEX); 1054 1055 rate->index = rs_ht_to_legacy[rate->index]; 1056 rate->ldpc = false; 1057 } else { 1058 /* Downgrade to SISO with same MCS if in MIMO */ 1059 rate->type = is_vht_mimo2(rate) ? 1060 LQ_VHT_SISO : LQ_HT_SISO; 1061 } 1062 1063 if (num_of_ant(rate->ant) > 1) 1064 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1065 1066 /* Relevant in both switching to SISO or Legacy */ 1067 rate->sgi = false; 1068 1069 if (!rs_rate_supported(lq_sta, rate)) 1070 rs_get_lower_rate_in_column(lq_sta, rate); 1071 } 1072 1073 /* Check if both rates are identical 1074 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1075 * with a rate indicating STBC/BFER and ANT_AB. 1076 */ 1077 static inline bool rs_rate_equal(struct rs_rate *a, 1078 struct rs_rate *b, 1079 bool allow_ant_mismatch) 1080 1081 { 1082 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1083 (a->bfer == b->bfer); 1084 1085 if (allow_ant_mismatch) { 1086 if (a->stbc || a->bfer) { 1087 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1088 a->stbc, a->bfer, a->ant); 1089 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1090 } else if (b->stbc || b->bfer) { 1091 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1092 b->stbc, b->bfer, b->ant); 1093 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1094 } 1095 } 1096 1097 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1098 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1099 } 1100 1101 /* Check if both rates share the same column */ 1102 static inline bool rs_rate_column_match(struct rs_rate *a, 1103 struct rs_rate *b) 1104 { 1105 bool ant_match; 1106 1107 if (a->stbc || a->bfer) 1108 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1109 else 1110 ant_match = (a->ant == b->ant); 1111 1112 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1113 && ant_match; 1114 } 1115 1116 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1117 { 1118 if (is_legacy(rate)) { 1119 if (rate->ant == ANT_A) 1120 return RS_COLUMN_LEGACY_ANT_A; 1121 1122 if (rate->ant == ANT_B) 1123 return RS_COLUMN_LEGACY_ANT_B; 1124 1125 goto err; 1126 } 1127 1128 if (is_siso(rate)) { 1129 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1130 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1131 RS_COLUMN_SISO_ANT_A; 1132 1133 if (rate->ant == ANT_B) 1134 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1135 RS_COLUMN_SISO_ANT_B; 1136 1137 goto err; 1138 } 1139 1140 if (is_mimo(rate)) 1141 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1142 1143 err: 1144 return RS_COLUMN_INVALID; 1145 } 1146 1147 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1148 { 1149 u8 tid = IWL_MAX_TID_COUNT; 1150 1151 if (ieee80211_is_data_qos(hdr->frame_control)) { 1152 u8 *qc = ieee80211_get_qos_ctl(hdr); 1153 tid = qc[0] & 0xf; 1154 } 1155 1156 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1157 tid = IWL_MAX_TID_COUNT; 1158 1159 return tid; 1160 } 1161 1162 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1163 int tid, struct ieee80211_tx_info *info) 1164 { 1165 int legacy_success; 1166 int retries; 1167 int i; 1168 struct iwl_lq_cmd *table; 1169 u32 lq_hwrate; 1170 struct rs_rate lq_rate, tx_resp_rate; 1171 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1172 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1173 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1174 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1175 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1176 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1177 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1178 1179 /* Treat uninitialized rate scaling data same as non-existing. */ 1180 if (!lq_sta) { 1181 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1182 return; 1183 } else if (!lq_sta->pers.drv) { 1184 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1185 return; 1186 } 1187 1188 /* This packet was aggregated but doesn't carry status info */ 1189 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1190 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1191 return; 1192 1193 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1194 1195 #ifdef CONFIG_MAC80211_DEBUGFS 1196 /* Disable last tx check if we are debugging with fixed rate but 1197 * update tx stats */ 1198 if (lq_sta->pers.dbg_fixed_rate) { 1199 int index = tx_resp_rate.index; 1200 enum rs_column column; 1201 int attempts, success; 1202 1203 column = rs_get_column_from_rate(&tx_resp_rate); 1204 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1205 "Can't map rate 0x%x to column", 1206 tx_resp_hwrate)) 1207 return; 1208 1209 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1210 attempts = info->status.ampdu_len; 1211 success = info->status.ampdu_ack_len; 1212 } else { 1213 attempts = info->status.rates[0].count; 1214 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1215 } 1216 1217 lq_sta->pers.tx_stats[column][index].total += attempts; 1218 lq_sta->pers.tx_stats[column][index].success += success; 1219 1220 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1221 tx_resp_hwrate, success, attempts); 1222 return; 1223 } 1224 #endif 1225 1226 if (time_after(jiffies, 1227 (unsigned long)(lq_sta->last_tx + 1228 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1229 int t; 1230 1231 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1232 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1233 ieee80211_stop_tx_ba_session(sta, t); 1234 1235 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1236 return; 1237 } 1238 lq_sta->last_tx = jiffies; 1239 1240 /* Ignore this Tx frame response if its initial rate doesn't match 1241 * that of latest Link Quality command. There may be stragglers 1242 * from a previous Link Quality command, but we're no longer interested 1243 * in those; they're either from the "active" mode while we're trying 1244 * to check "search" mode, or a prior "search" mode after we've moved 1245 * to a new "search" mode (which might become the new "active" mode). 1246 */ 1247 table = &lq_sta->lq; 1248 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1249 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1250 1251 /* Here we actually compare this rate to the latest LQ command */ 1252 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1253 IWL_DEBUG_RATE(mvm, 1254 "initial tx resp rate 0x%x does not match 0x%x\n", 1255 tx_resp_hwrate, lq_hwrate); 1256 1257 /* 1258 * Since rates mis-match, the last LQ command may have failed. 1259 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1260 * ... driver. 1261 */ 1262 lq_sta->missed_rate_counter++; 1263 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1264 lq_sta->missed_rate_counter = 0; 1265 IWL_DEBUG_RATE(mvm, 1266 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1267 lq_sta->rs_state); 1268 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1269 } 1270 /* Regardless, ignore this status info for outdated rate */ 1271 return; 1272 } else 1273 /* Rate did match, so reset the missed_rate_counter */ 1274 lq_sta->missed_rate_counter = 0; 1275 1276 if (!lq_sta->search_better_tbl) { 1277 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1278 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1279 } else { 1280 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1281 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1282 } 1283 1284 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1285 IWL_DEBUG_RATE(mvm, 1286 "Neither active nor search matches tx rate\n"); 1287 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1288 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1289 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1290 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1291 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1292 1293 /* 1294 * no matching table found, let's by-pass the data collection 1295 * and continue to perform rate scale to find the rate table 1296 */ 1297 rs_stay_in_table(lq_sta, true); 1298 goto done; 1299 } 1300 1301 /* 1302 * Updating the frame history depends on whether packets were 1303 * aggregated. 1304 * 1305 * For aggregation, all packets were transmitted at the same rate, the 1306 * first index into rate scale table. 1307 */ 1308 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1309 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1310 info->status.ampdu_len, 1311 info->status.ampdu_ack_len, 1312 reduced_txp); 1313 1314 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1315 * it as a single frame loss as we don't want the success ratio 1316 * to dip too quickly because a BA wasn't received. 1317 * For TPC, there's no need for this optimisation since we want 1318 * to recover very quickly from a bad power reduction and, 1319 * therefore we'd like the success ratio to get an immediate hit 1320 * when failing to get a BA, so we'd switch back to a lower or 1321 * zero power reduction. When FW transmits agg with a rate 1322 * different from the initial rate, it will not use reduced txp 1323 * and will send BA notification twice (one empty with reduced 1324 * txp equal to the value from LQ and one with reduced txp 0). 1325 * We need to update counters for each txp level accordingly. 1326 */ 1327 if (info->status.ampdu_ack_len == 0) 1328 info->status.ampdu_len = 1; 1329 1330 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1331 info->status.ampdu_len, 1332 info->status.ampdu_ack_len); 1333 1334 /* Update success/fail counts if not searching for new mode */ 1335 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1336 lq_sta->total_success += info->status.ampdu_ack_len; 1337 lq_sta->total_failed += (info->status.ampdu_len - 1338 info->status.ampdu_ack_len); 1339 } 1340 } else { 1341 /* For legacy, update frame history with for each Tx retry. */ 1342 retries = info->status.rates[0].count - 1; 1343 /* HW doesn't send more than 15 retries */ 1344 retries = min(retries, 15); 1345 1346 /* The last transmission may have been successful */ 1347 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1348 /* Collect data for each rate used during failed TX attempts */ 1349 for (i = 0; i <= retries; ++i) { 1350 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1351 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1352 &lq_rate); 1353 /* 1354 * Only collect stats if retried rate is in the same RS 1355 * table as active/search. 1356 */ 1357 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1358 tmp_tbl = curr_tbl; 1359 else if (rs_rate_column_match(&lq_rate, 1360 &other_tbl->rate)) 1361 tmp_tbl = other_tbl; 1362 else 1363 continue; 1364 1365 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1366 lq_rate.index, 1, 1367 i < retries ? 0 : legacy_success, 1368 reduced_txp); 1369 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1370 lq_rate.index, 1, 1371 i < retries ? 0 : legacy_success); 1372 } 1373 1374 /* Update success/fail counts if not searching for new mode */ 1375 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1376 lq_sta->total_success += legacy_success; 1377 lq_sta->total_failed += retries + (1 - legacy_success); 1378 } 1379 } 1380 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1381 lq_sta->last_rate_n_flags = lq_hwrate; 1382 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1383 done: 1384 /* See if there's a better rate or modulation mode to try. */ 1385 if (sta->supp_rates[info->band]) 1386 rs_rate_scale_perform(mvm, sta, lq_sta, tid); 1387 } 1388 1389 /* 1390 * mac80211 sends us Tx status 1391 */ 1392 static void rs_mac80211_tx_status(void *mvm_r, 1393 struct ieee80211_supported_band *sband, 1394 struct ieee80211_sta *sta, void *priv_sta, 1395 struct sk_buff *skb) 1396 { 1397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1398 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1399 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1401 1402 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1403 return; 1404 1405 if (!ieee80211_is_data(hdr->frame_control) || 1406 info->flags & IEEE80211_TX_CTL_NO_ACK) 1407 return; 1408 1409 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info); 1410 } 1411 1412 /* 1413 * Begin a period of staying with a selected modulation mode. 1414 * Set "stay_in_tbl" flag to prevent any mode switches. 1415 * Set frame tx success limits according to legacy vs. high-throughput, 1416 * and reset overall (spanning all rates) tx success history statistics. 1417 * These control how long we stay using same modulation mode before 1418 * searching for a new mode. 1419 */ 1420 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1421 struct iwl_lq_sta *lq_sta) 1422 { 1423 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1424 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1425 if (is_legacy) { 1426 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1427 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1428 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1429 } else { 1430 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1431 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1432 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1433 } 1434 lq_sta->table_count = 0; 1435 lq_sta->total_failed = 0; 1436 lq_sta->total_success = 0; 1437 lq_sta->flush_timer = jiffies; 1438 lq_sta->visited_columns = 0; 1439 } 1440 1441 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1442 { 1443 if (rate_mask) 1444 return find_last_bit(&rate_mask, BITS_PER_LONG); 1445 return IWL_RATE_INVALID; 1446 } 1447 1448 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1449 const struct rs_tx_column *column) 1450 { 1451 switch (column->mode) { 1452 case RS_LEGACY: 1453 return lq_sta->max_legacy_rate_idx; 1454 case RS_SISO: 1455 return lq_sta->max_siso_rate_idx; 1456 case RS_MIMO2: 1457 return lq_sta->max_mimo2_rate_idx; 1458 default: 1459 WARN_ON_ONCE(1); 1460 } 1461 1462 return lq_sta->max_legacy_rate_idx; 1463 } 1464 1465 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1466 const struct rs_tx_column *column, 1467 u32 bw) 1468 { 1469 /* Used to choose among HT tables */ 1470 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1471 1472 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1473 column->mode != RS_SISO && 1474 column->mode != RS_MIMO2)) 1475 return expected_tpt_legacy; 1476 1477 /* Legacy rates have only one table */ 1478 if (column->mode == RS_LEGACY) 1479 return expected_tpt_legacy; 1480 1481 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1482 /* Choose among many HT tables depending on number of streams 1483 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1484 * status */ 1485 if (column->mode == RS_SISO) { 1486 switch (bw) { 1487 case RATE_MCS_CHAN_WIDTH_20: 1488 ht_tbl_pointer = expected_tpt_siso_20MHz; 1489 break; 1490 case RATE_MCS_CHAN_WIDTH_40: 1491 ht_tbl_pointer = expected_tpt_siso_40MHz; 1492 break; 1493 case RATE_MCS_CHAN_WIDTH_80: 1494 ht_tbl_pointer = expected_tpt_siso_80MHz; 1495 break; 1496 default: 1497 WARN_ON_ONCE(1); 1498 } 1499 } else if (column->mode == RS_MIMO2) { 1500 switch (bw) { 1501 case RATE_MCS_CHAN_WIDTH_20: 1502 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1503 break; 1504 case RATE_MCS_CHAN_WIDTH_40: 1505 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1506 break; 1507 case RATE_MCS_CHAN_WIDTH_80: 1508 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1509 break; 1510 default: 1511 WARN_ON_ONCE(1); 1512 } 1513 } else { 1514 WARN_ON_ONCE(1); 1515 } 1516 1517 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1518 return ht_tbl_pointer[0]; 1519 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1520 return ht_tbl_pointer[1]; 1521 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1522 return ht_tbl_pointer[2]; 1523 else /* AGG+SGI */ 1524 return ht_tbl_pointer[3]; 1525 } 1526 1527 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1528 struct iwl_scale_tbl_info *tbl) 1529 { 1530 struct rs_rate *rate = &tbl->rate; 1531 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1532 1533 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1534 } 1535 1536 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1537 struct iwl_lq_sta *lq_sta, 1538 struct iwl_scale_tbl_info *tbl, /* "search" */ 1539 unsigned long rate_mask, s8 index) 1540 { 1541 struct iwl_scale_tbl_info *active_tbl = 1542 &(lq_sta->lq_info[lq_sta->active_tbl]); 1543 s32 success_ratio = active_tbl->win[index].success_ratio; 1544 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1545 const u16 *tpt_tbl = tbl->expected_tpt; 1546 u16 high_low; 1547 u32 target_tpt; 1548 int rate_idx; 1549 1550 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1551 target_tpt = 100 * expected_current_tpt; 1552 IWL_DEBUG_RATE(mvm, 1553 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1554 success_ratio, target_tpt); 1555 } else { 1556 target_tpt = lq_sta->last_tpt; 1557 IWL_DEBUG_RATE(mvm, 1558 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1559 success_ratio, target_tpt); 1560 } 1561 1562 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1563 1564 while (rate_idx != IWL_RATE_INVALID) { 1565 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1566 break; 1567 1568 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1569 tbl->rate.type); 1570 1571 rate_idx = (high_low >> 8) & 0xff; 1572 } 1573 1574 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1575 rate_idx, target_tpt, 1576 rate_idx != IWL_RATE_INVALID ? 1577 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1578 1579 return rate_idx; 1580 } 1581 1582 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1583 { 1584 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 1585 return RATE_MCS_CHAN_WIDTH_80; 1586 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) 1587 return RATE_MCS_CHAN_WIDTH_40; 1588 1589 return RATE_MCS_CHAN_WIDTH_20; 1590 } 1591 1592 /* 1593 * Check whether we should continue using same modulation mode, or 1594 * begin search for a new mode, based on: 1595 * 1) # tx successes or failures while using this mode 1596 * 2) # times calling this function 1597 * 3) elapsed time in this mode (not used, for now) 1598 */ 1599 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1600 { 1601 struct iwl_scale_tbl_info *tbl; 1602 int active_tbl; 1603 int flush_interval_passed = 0; 1604 struct iwl_mvm *mvm; 1605 1606 mvm = lq_sta->pers.drv; 1607 active_tbl = lq_sta->active_tbl; 1608 1609 tbl = &(lq_sta->lq_info[active_tbl]); 1610 1611 /* If we've been disallowing search, see if we should now allow it */ 1612 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1613 /* Elapsed time using current modulation mode */ 1614 if (lq_sta->flush_timer) 1615 flush_interval_passed = 1616 time_after(jiffies, 1617 (unsigned long)(lq_sta->flush_timer + 1618 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1619 1620 /* 1621 * Check if we should allow search for new modulation mode. 1622 * If many frames have failed or succeeded, or we've used 1623 * this same modulation for a long time, allow search, and 1624 * reset history stats that keep track of whether we should 1625 * allow a new search. Also (below) reset all bitmaps and 1626 * stats in active history. 1627 */ 1628 if (force_search || 1629 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1630 (lq_sta->total_success > lq_sta->max_success_limit) || 1631 ((!lq_sta->search_better_tbl) && 1632 (lq_sta->flush_timer) && (flush_interval_passed))) { 1633 IWL_DEBUG_RATE(mvm, 1634 "LQ: stay is expired %d %d %d\n", 1635 lq_sta->total_failed, 1636 lq_sta->total_success, 1637 flush_interval_passed); 1638 1639 /* Allow search for new mode */ 1640 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1641 IWL_DEBUG_RATE(mvm, 1642 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1643 lq_sta->total_failed = 0; 1644 lq_sta->total_success = 0; 1645 lq_sta->flush_timer = 0; 1646 /* mark the current column as visited */ 1647 lq_sta->visited_columns = BIT(tbl->column); 1648 /* 1649 * Else if we've used this modulation mode enough repetitions 1650 * (regardless of elapsed time or success/failure), reset 1651 * history bitmaps and rate-specific stats for all rates in 1652 * active table. 1653 */ 1654 } else { 1655 lq_sta->table_count++; 1656 if (lq_sta->table_count >= 1657 lq_sta->table_count_limit) { 1658 lq_sta->table_count = 0; 1659 1660 IWL_DEBUG_RATE(mvm, 1661 "LQ: stay in table clear win\n"); 1662 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1663 } 1664 } 1665 1666 /* If transitioning to allow "search", reset all history 1667 * bitmaps and stats in active table (this will become the new 1668 * "search" table). */ 1669 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1670 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1671 } 1672 } 1673 } 1674 1675 /* 1676 * setup rate table in uCode 1677 */ 1678 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1679 struct ieee80211_sta *sta, 1680 struct iwl_lq_sta *lq_sta, 1681 struct iwl_scale_tbl_info *tbl) 1682 { 1683 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1684 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1685 } 1686 1687 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1688 struct ieee80211_sta *sta, 1689 struct iwl_lq_sta *lq_sta, 1690 struct iwl_scale_tbl_info *tbl, 1691 enum rs_action scale_action) 1692 { 1693 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1694 return false; 1695 1696 if (!is_vht_siso(&tbl->rate)) 1697 return false; 1698 1699 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1700 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1701 (scale_action == RS_ACTION_DOWNSCALE)) { 1702 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1703 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1704 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1705 goto tweaked; 1706 } 1707 1708 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1709 * sustainable, i.e. we're past the test window. We can't go back 1710 * if MCS5 is just tested as this will happen always after switching 1711 * to 20Mhz MCS4 because the rate stats are cleared. 1712 */ 1713 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1714 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1715 (scale_action == RS_ACTION_STAY)) || 1716 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1717 (scale_action == RS_ACTION_UPSCALE)))) { 1718 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1719 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1720 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1721 goto tweaked; 1722 } 1723 1724 return false; 1725 1726 tweaked: 1727 rs_set_expected_tpt_table(lq_sta, tbl); 1728 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1729 return true; 1730 } 1731 1732 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1733 struct iwl_lq_sta *lq_sta, 1734 struct ieee80211_sta *sta, 1735 struct iwl_scale_tbl_info *tbl) 1736 { 1737 int i, j, max_rate; 1738 enum rs_column next_col_id; 1739 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1740 const struct rs_tx_column *next_col; 1741 allow_column_func_t allow_func; 1742 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1743 const u16 *expected_tpt_tbl; 1744 u16 tpt, max_expected_tpt; 1745 1746 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1747 next_col_id = curr_col->next_columns[i]; 1748 1749 if (next_col_id == RS_COLUMN_INVALID) 1750 continue; 1751 1752 if (lq_sta->visited_columns & BIT(next_col_id)) { 1753 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1754 next_col_id); 1755 continue; 1756 } 1757 1758 next_col = &rs_tx_columns[next_col_id]; 1759 1760 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1761 IWL_DEBUG_RATE(mvm, 1762 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1763 next_col_id, valid_ants, next_col->ant); 1764 continue; 1765 } 1766 1767 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1768 allow_func = next_col->checks[j]; 1769 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1770 next_col)) 1771 break; 1772 } 1773 1774 if (j != MAX_COLUMN_CHECKS) { 1775 IWL_DEBUG_RATE(mvm, 1776 "Skip column %d: not allowed (check %d failed)\n", 1777 next_col_id, j); 1778 1779 continue; 1780 } 1781 1782 tpt = lq_sta->last_tpt / 100; 1783 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1784 rs_bw_from_sta_bw(sta)); 1785 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1786 continue; 1787 1788 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1789 if (max_rate == IWL_RATE_INVALID) { 1790 IWL_DEBUG_RATE(mvm, 1791 "Skip column %d: no rate is allowed in this column\n", 1792 next_col_id); 1793 continue; 1794 } 1795 1796 max_expected_tpt = expected_tpt_tbl[max_rate]; 1797 if (tpt >= max_expected_tpt) { 1798 IWL_DEBUG_RATE(mvm, 1799 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1800 next_col_id, max_expected_tpt, tpt); 1801 continue; 1802 } 1803 1804 IWL_DEBUG_RATE(mvm, 1805 "Found potential column %d. Max expected %d current %d\n", 1806 next_col_id, max_expected_tpt, tpt); 1807 break; 1808 } 1809 1810 if (i == MAX_NEXT_COLUMNS) 1811 return RS_COLUMN_INVALID; 1812 1813 return next_col_id; 1814 } 1815 1816 static int rs_switch_to_column(struct iwl_mvm *mvm, 1817 struct iwl_lq_sta *lq_sta, 1818 struct ieee80211_sta *sta, 1819 enum rs_column col_id) 1820 { 1821 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1822 struct iwl_scale_tbl_info *search_tbl = 1823 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1824 struct rs_rate *rate = &search_tbl->rate; 1825 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1826 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1827 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1828 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1829 unsigned long rate_mask = 0; 1830 u32 rate_idx = 0; 1831 1832 memcpy(search_tbl, tbl, sz); 1833 1834 rate->sgi = column->sgi; 1835 rate->ant = column->ant; 1836 1837 if (column->mode == RS_LEGACY) { 1838 if (lq_sta->band == IEEE80211_BAND_5GHZ) 1839 rate->type = LQ_LEGACY_A; 1840 else 1841 rate->type = LQ_LEGACY_G; 1842 1843 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1844 rate->ldpc = false; 1845 rate_mask = lq_sta->active_legacy_rate; 1846 } else if (column->mode == RS_SISO) { 1847 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1848 rate_mask = lq_sta->active_siso_rate; 1849 } else if (column->mode == RS_MIMO2) { 1850 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1851 rate_mask = lq_sta->active_mimo2_rate; 1852 } else { 1853 WARN_ONCE(1, "Bad column mode"); 1854 } 1855 1856 if (column->mode != RS_LEGACY) { 1857 rate->bw = rs_bw_from_sta_bw(sta); 1858 rate->ldpc = lq_sta->ldpc; 1859 } 1860 1861 search_tbl->column = col_id; 1862 rs_set_expected_tpt_table(lq_sta, search_tbl); 1863 1864 lq_sta->visited_columns |= BIT(col_id); 1865 1866 /* Get the best matching rate if we're changing modes. e.g. 1867 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1868 */ 1869 if (curr_column->mode != column->mode) { 1870 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1871 rate_mask, rate->index); 1872 1873 if ((rate_idx == IWL_RATE_INVALID) || 1874 !(BIT(rate_idx) & rate_mask)) { 1875 IWL_DEBUG_RATE(mvm, 1876 "can not switch with index %d" 1877 " rate mask %lx\n", 1878 rate_idx, rate_mask); 1879 1880 goto err; 1881 } 1882 1883 rate->index = rate_idx; 1884 } 1885 1886 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1887 col_id, rate->index); 1888 1889 return 0; 1890 1891 err: 1892 rate->type = LQ_NONE; 1893 return -1; 1894 } 1895 1896 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1897 struct iwl_scale_tbl_info *tbl, 1898 s32 sr, int low, int high, 1899 int current_tpt, 1900 int low_tpt, int high_tpt) 1901 { 1902 enum rs_action action = RS_ACTION_STAY; 1903 1904 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1905 (current_tpt == 0)) { 1906 IWL_DEBUG_RATE(mvm, 1907 "Decrease rate because of low SR\n"); 1908 return RS_ACTION_DOWNSCALE; 1909 } 1910 1911 if ((low_tpt == IWL_INVALID_VALUE) && 1912 (high_tpt == IWL_INVALID_VALUE) && 1913 (high != IWL_RATE_INVALID)) { 1914 IWL_DEBUG_RATE(mvm, 1915 "No data about high/low rates. Increase rate\n"); 1916 return RS_ACTION_UPSCALE; 1917 } 1918 1919 if ((high_tpt == IWL_INVALID_VALUE) && 1920 (high != IWL_RATE_INVALID) && 1921 (low_tpt != IWL_INVALID_VALUE) && 1922 (low_tpt < current_tpt)) { 1923 IWL_DEBUG_RATE(mvm, 1924 "No data about high rate and low rate is worse. Increase rate\n"); 1925 return RS_ACTION_UPSCALE; 1926 } 1927 1928 if ((high_tpt != IWL_INVALID_VALUE) && 1929 (high_tpt > current_tpt)) { 1930 IWL_DEBUG_RATE(mvm, 1931 "Higher rate is better. Increate rate\n"); 1932 return RS_ACTION_UPSCALE; 1933 } 1934 1935 if ((low_tpt != IWL_INVALID_VALUE) && 1936 (high_tpt != IWL_INVALID_VALUE) && 1937 (low_tpt < current_tpt) && 1938 (high_tpt < current_tpt)) { 1939 IWL_DEBUG_RATE(mvm, 1940 "Both high and low are worse. Maintain rate\n"); 1941 return RS_ACTION_STAY; 1942 } 1943 1944 if ((low_tpt != IWL_INVALID_VALUE) && 1945 (low_tpt > current_tpt)) { 1946 IWL_DEBUG_RATE(mvm, 1947 "Lower rate is better\n"); 1948 action = RS_ACTION_DOWNSCALE; 1949 goto out; 1950 } 1951 1952 if ((low_tpt == IWL_INVALID_VALUE) && 1953 (low != IWL_RATE_INVALID)) { 1954 IWL_DEBUG_RATE(mvm, 1955 "No data about lower rate\n"); 1956 action = RS_ACTION_DOWNSCALE; 1957 goto out; 1958 } 1959 1960 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1961 1962 out: 1963 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1964 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1965 IWL_DEBUG_RATE(mvm, 1966 "SR is above NO DECREASE. Avoid downscale\n"); 1967 action = RS_ACTION_STAY; 1968 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1969 IWL_DEBUG_RATE(mvm, 1970 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1971 action = RS_ACTION_STAY; 1972 } else { 1973 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1974 } 1975 } 1976 1977 return action; 1978 } 1979 1980 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1981 struct iwl_lq_sta *lq_sta) 1982 { 1983 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1984 * supports STBC of at least 1*SS 1985 */ 1986 if (!lq_sta->stbc_capable) 1987 return false; 1988 1989 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1990 return false; 1991 1992 return true; 1993 } 1994 1995 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1996 int *weaker, int *stronger) 1997 { 1998 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1999 if (*weaker > TPC_MAX_REDUCTION) 2000 *weaker = TPC_INVALID; 2001 2002 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2003 if (*stronger < 0) 2004 *stronger = TPC_INVALID; 2005 } 2006 2007 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2008 struct rs_rate *rate, enum ieee80211_band band) 2009 { 2010 int index = rate->index; 2011 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2012 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2013 !vif->bss_conf.ps); 2014 2015 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2016 cam, sta_ps_disabled); 2017 /* 2018 * allow tpc only if power management is enabled, or bt coex 2019 * activity grade allows it and we are on 2.4Ghz. 2020 */ 2021 if ((cam || sta_ps_disabled) && 2022 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2023 return false; 2024 2025 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2026 if (is_legacy(rate)) 2027 return index == IWL_RATE_54M_INDEX; 2028 if (is_ht(rate)) 2029 return index == IWL_RATE_MCS_7_INDEX; 2030 if (is_vht(rate)) 2031 return index == IWL_RATE_MCS_7_INDEX || 2032 index == IWL_RATE_MCS_8_INDEX || 2033 index == IWL_RATE_MCS_9_INDEX; 2034 2035 WARN_ON_ONCE(1); 2036 return false; 2037 } 2038 2039 enum tpc_action { 2040 TPC_ACTION_STAY, 2041 TPC_ACTION_DECREASE, 2042 TPC_ACTION_INCREASE, 2043 TPC_ACTION_NO_RESTIRCTION, 2044 }; 2045 2046 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2047 s32 sr, int weak, int strong, 2048 int current_tpt, 2049 int weak_tpt, int strong_tpt) 2050 { 2051 /* stay until we have valid tpt */ 2052 if (current_tpt == IWL_INVALID_VALUE) { 2053 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2054 return TPC_ACTION_STAY; 2055 } 2056 2057 /* Too many failures, increase txp */ 2058 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2059 current_tpt == 0) { 2060 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2061 return TPC_ACTION_NO_RESTIRCTION; 2062 } 2063 2064 /* try decreasing first if applicable */ 2065 if (weak != TPC_INVALID) { 2066 if (weak_tpt == IWL_INVALID_VALUE && 2067 (strong_tpt == IWL_INVALID_VALUE || 2068 current_tpt >= strong_tpt)) { 2069 IWL_DEBUG_RATE(mvm, 2070 "no weak txp measurement. decrease txp\n"); 2071 return TPC_ACTION_DECREASE; 2072 } 2073 2074 if (weak_tpt > current_tpt) { 2075 IWL_DEBUG_RATE(mvm, 2076 "lower txp has better tpt. decrease txp\n"); 2077 return TPC_ACTION_DECREASE; 2078 } 2079 } 2080 2081 /* next, increase if needed */ 2082 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2083 strong != TPC_INVALID) { 2084 if (weak_tpt == IWL_INVALID_VALUE && 2085 strong_tpt != IWL_INVALID_VALUE && 2086 current_tpt < strong_tpt) { 2087 IWL_DEBUG_RATE(mvm, 2088 "higher txp has better tpt. increase txp\n"); 2089 return TPC_ACTION_INCREASE; 2090 } 2091 2092 if (weak_tpt < current_tpt && 2093 (strong_tpt == IWL_INVALID_VALUE || 2094 strong_tpt > current_tpt)) { 2095 IWL_DEBUG_RATE(mvm, 2096 "lower txp has worse tpt. increase txp\n"); 2097 return TPC_ACTION_INCREASE; 2098 } 2099 } 2100 2101 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2102 return TPC_ACTION_STAY; 2103 } 2104 2105 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2106 struct ieee80211_sta *sta, 2107 struct iwl_lq_sta *lq_sta, 2108 struct iwl_scale_tbl_info *tbl) 2109 { 2110 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2111 struct ieee80211_vif *vif = mvm_sta->vif; 2112 struct ieee80211_chanctx_conf *chanctx_conf; 2113 enum ieee80211_band band; 2114 struct iwl_rate_scale_data *window; 2115 struct rs_rate *rate = &tbl->rate; 2116 enum tpc_action action; 2117 s32 sr; 2118 u8 cur = lq_sta->lq.reduced_tpc; 2119 int current_tpt; 2120 int weak, strong; 2121 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2122 2123 #ifdef CONFIG_MAC80211_DEBUGFS 2124 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2125 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2126 lq_sta->pers.dbg_fixed_txp_reduction); 2127 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2128 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2129 } 2130 #endif 2131 2132 rcu_read_lock(); 2133 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2134 if (WARN_ON(!chanctx_conf)) 2135 band = IEEE80211_NUM_BANDS; 2136 else 2137 band = chanctx_conf->def.chan->band; 2138 rcu_read_unlock(); 2139 2140 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2141 IWL_DEBUG_RATE(mvm, 2142 "tpc is not allowed. remove txp restrictions\n"); 2143 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2144 return cur != TPC_NO_REDUCTION; 2145 } 2146 2147 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2148 2149 /* Collect measured throughputs for current and adjacent rates */ 2150 window = tbl->tpc_win; 2151 sr = window[cur].success_ratio; 2152 current_tpt = window[cur].average_tpt; 2153 if (weak != TPC_INVALID) 2154 weak_tpt = window[weak].average_tpt; 2155 if (strong != TPC_INVALID) 2156 strong_tpt = window[strong].average_tpt; 2157 2158 IWL_DEBUG_RATE(mvm, 2159 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2160 cur, current_tpt, sr, weak, strong, 2161 weak_tpt, strong_tpt); 2162 2163 action = rs_get_tpc_action(mvm, sr, weak, strong, 2164 current_tpt, weak_tpt, strong_tpt); 2165 2166 /* override actions if we are on the edge */ 2167 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2168 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2169 action = TPC_ACTION_STAY; 2170 } else if (strong == TPC_INVALID && 2171 (action == TPC_ACTION_INCREASE || 2172 action == TPC_ACTION_NO_RESTIRCTION)) { 2173 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2174 action = TPC_ACTION_STAY; 2175 } 2176 2177 switch (action) { 2178 case TPC_ACTION_DECREASE: 2179 lq_sta->lq.reduced_tpc = weak; 2180 return true; 2181 case TPC_ACTION_INCREASE: 2182 lq_sta->lq.reduced_tpc = strong; 2183 return true; 2184 case TPC_ACTION_NO_RESTIRCTION: 2185 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2186 return true; 2187 case TPC_ACTION_STAY: 2188 /* do nothing */ 2189 break; 2190 } 2191 return false; 2192 } 2193 2194 /* 2195 * Do rate scaling and search for new modulation mode. 2196 */ 2197 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2198 struct ieee80211_sta *sta, 2199 struct iwl_lq_sta *lq_sta, 2200 int tid) 2201 { 2202 int low = IWL_RATE_INVALID; 2203 int high = IWL_RATE_INVALID; 2204 int index; 2205 struct iwl_rate_scale_data *window = NULL; 2206 int current_tpt = IWL_INVALID_VALUE; 2207 int low_tpt = IWL_INVALID_VALUE; 2208 int high_tpt = IWL_INVALID_VALUE; 2209 u32 fail_count; 2210 enum rs_action scale_action = RS_ACTION_STAY; 2211 u16 rate_mask; 2212 u8 update_lq = 0; 2213 struct iwl_scale_tbl_info *tbl, *tbl1; 2214 u8 active_tbl = 0; 2215 u8 done_search = 0; 2216 u16 high_low; 2217 s32 sr; 2218 u8 prev_agg = lq_sta->is_agg; 2219 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2220 struct iwl_mvm_tid_data *tid_data; 2221 struct rs_rate *rate; 2222 2223 lq_sta->is_agg = !!sta_priv->agg_tids; 2224 2225 /* 2226 * Select rate-scale / modulation-mode table to work with in 2227 * the rest of this function: "search" if searching for better 2228 * modulation mode, or "active" if doing rate scaling within a mode. 2229 */ 2230 if (!lq_sta->search_better_tbl) 2231 active_tbl = lq_sta->active_tbl; 2232 else 2233 active_tbl = 1 - lq_sta->active_tbl; 2234 2235 tbl = &(lq_sta->lq_info[active_tbl]); 2236 rate = &tbl->rate; 2237 2238 if (prev_agg != lq_sta->is_agg) { 2239 IWL_DEBUG_RATE(mvm, 2240 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2241 prev_agg, lq_sta->is_agg); 2242 rs_set_expected_tpt_table(lq_sta, tbl); 2243 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2244 } 2245 2246 /* current tx rate */ 2247 index = rate->index; 2248 2249 /* rates available for this association, and for modulation mode */ 2250 rate_mask = rs_get_supported_rates(lq_sta, rate); 2251 2252 if (!(BIT(index) & rate_mask)) { 2253 IWL_ERR(mvm, "Current Rate is not valid\n"); 2254 if (lq_sta->search_better_tbl) { 2255 /* revert to active table if search table is not valid*/ 2256 rate->type = LQ_NONE; 2257 lq_sta->search_better_tbl = 0; 2258 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2259 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2260 } 2261 return; 2262 } 2263 2264 /* Get expected throughput table and history window for current rate */ 2265 if (!tbl->expected_tpt) { 2266 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2267 return; 2268 } 2269 2270 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2271 window = &(tbl->win[index]); 2272 2273 /* 2274 * If there is not enough history to calculate actual average 2275 * throughput, keep analyzing results of more tx frames, without 2276 * changing rate or mode (bypass most of the rest of this function). 2277 * Set up new rate table in uCode only if old rate is not supported 2278 * in current association (use new rate found above). 2279 */ 2280 fail_count = window->counter - window->success_counter; 2281 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2282 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2283 IWL_DEBUG_RATE(mvm, 2284 "%s: Test Window: succ %d total %d\n", 2285 rs_pretty_rate(rate), 2286 window->success_counter, window->counter); 2287 2288 /* Can't calculate this yet; not enough history */ 2289 window->average_tpt = IWL_INVALID_VALUE; 2290 2291 /* Should we stay with this modulation mode, 2292 * or search for a new one? */ 2293 rs_stay_in_table(lq_sta, false); 2294 2295 return; 2296 } 2297 2298 /* If we are searching for better modulation mode, check success. */ 2299 if (lq_sta->search_better_tbl) { 2300 /* If good success, continue using the "search" mode; 2301 * no need to send new link quality command, since we're 2302 * continuing to use the setup that we've been trying. */ 2303 if (window->average_tpt > lq_sta->last_tpt) { 2304 IWL_DEBUG_RATE(mvm, 2305 "SWITCHING TO NEW TABLE SR: %d " 2306 "cur-tpt %d old-tpt %d\n", 2307 window->success_ratio, 2308 window->average_tpt, 2309 lq_sta->last_tpt); 2310 2311 /* Swap tables; "search" becomes "active" */ 2312 lq_sta->active_tbl = active_tbl; 2313 current_tpt = window->average_tpt; 2314 /* Else poor success; go back to mode in "active" table */ 2315 } else { 2316 IWL_DEBUG_RATE(mvm, 2317 "GOING BACK TO THE OLD TABLE: SR %d " 2318 "cur-tpt %d old-tpt %d\n", 2319 window->success_ratio, 2320 window->average_tpt, 2321 lq_sta->last_tpt); 2322 2323 /* Nullify "search" table */ 2324 rate->type = LQ_NONE; 2325 2326 /* Revert to "active" table */ 2327 active_tbl = lq_sta->active_tbl; 2328 tbl = &(lq_sta->lq_info[active_tbl]); 2329 2330 /* Revert to "active" rate and throughput info */ 2331 index = tbl->rate.index; 2332 current_tpt = lq_sta->last_tpt; 2333 2334 /* Need to set up a new rate table in uCode */ 2335 update_lq = 1; 2336 } 2337 2338 /* Either way, we've made a decision; modulation mode 2339 * search is done, allow rate adjustment next time. */ 2340 lq_sta->search_better_tbl = 0; 2341 done_search = 1; /* Don't switch modes below! */ 2342 goto lq_update; 2343 } 2344 2345 /* (Else) not in search of better modulation mode, try for better 2346 * starting rate, while staying in this mode. */ 2347 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2348 low = high_low & 0xff; 2349 high = (high_low >> 8) & 0xff; 2350 2351 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2352 2353 sr = window->success_ratio; 2354 2355 /* Collect measured throughputs for current and adjacent rates */ 2356 current_tpt = window->average_tpt; 2357 if (low != IWL_RATE_INVALID) 2358 low_tpt = tbl->win[low].average_tpt; 2359 if (high != IWL_RATE_INVALID) 2360 high_tpt = tbl->win[high].average_tpt; 2361 2362 IWL_DEBUG_RATE(mvm, 2363 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2364 rs_pretty_rate(rate), current_tpt, sr, 2365 low, high, low_tpt, high_tpt); 2366 2367 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2368 current_tpt, low_tpt, high_tpt); 2369 2370 /* Force a search in case BT doesn't like us being in MIMO */ 2371 if (is_mimo(rate) && 2372 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2373 IWL_DEBUG_RATE(mvm, 2374 "BT Coex forbids MIMO. Search for new config\n"); 2375 rs_stay_in_table(lq_sta, true); 2376 goto lq_update; 2377 } 2378 2379 switch (scale_action) { 2380 case RS_ACTION_DOWNSCALE: 2381 /* Decrease starting rate, update uCode's rate table */ 2382 if (low != IWL_RATE_INVALID) { 2383 update_lq = 1; 2384 index = low; 2385 } else { 2386 IWL_DEBUG_RATE(mvm, 2387 "At the bottom rate. Can't decrease\n"); 2388 } 2389 2390 break; 2391 case RS_ACTION_UPSCALE: 2392 /* Increase starting rate, update uCode's rate table */ 2393 if (high != IWL_RATE_INVALID) { 2394 update_lq = 1; 2395 index = high; 2396 } else { 2397 IWL_DEBUG_RATE(mvm, 2398 "At the top rate. Can't increase\n"); 2399 } 2400 2401 break; 2402 case RS_ACTION_STAY: 2403 /* No change */ 2404 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2405 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2406 break; 2407 default: 2408 break; 2409 } 2410 2411 lq_update: 2412 /* Replace uCode's rate table for the destination station. */ 2413 if (update_lq) { 2414 tbl->rate.index = index; 2415 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2416 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2417 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2418 } 2419 2420 rs_stay_in_table(lq_sta, false); 2421 2422 /* 2423 * Search for new modulation mode if we're: 2424 * 1) Not changing rates right now 2425 * 2) Not just finishing up a search 2426 * 3) Allowing a new search 2427 */ 2428 if (!update_lq && !done_search && 2429 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2430 && window->counter) { 2431 enum rs_column next_column; 2432 2433 /* Save current throughput to compare with "search" throughput*/ 2434 lq_sta->last_tpt = current_tpt; 2435 2436 IWL_DEBUG_RATE(mvm, 2437 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2438 update_lq, done_search, lq_sta->rs_state, 2439 window->counter); 2440 2441 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2442 if (next_column != RS_COLUMN_INVALID) { 2443 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2444 next_column); 2445 if (!ret) 2446 lq_sta->search_better_tbl = 1; 2447 } else { 2448 IWL_DEBUG_RATE(mvm, 2449 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2450 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2451 } 2452 2453 /* If new "search" mode was selected, set up in uCode table */ 2454 if (lq_sta->search_better_tbl) { 2455 /* Access the "search" table, clear its history. */ 2456 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2457 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2458 2459 /* Use new "search" start rate */ 2460 index = tbl->rate.index; 2461 2462 rs_dump_rate(mvm, &tbl->rate, 2463 "Switch to SEARCH TABLE:"); 2464 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2465 } else { 2466 done_search = 1; 2467 } 2468 } 2469 2470 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2471 /* If the "active" (non-search) mode was legacy, 2472 * and we've tried switching antennas, 2473 * but we haven't been able to try HT modes (not available), 2474 * stay with best antenna legacy modulation for a while 2475 * before next round of mode comparisons. */ 2476 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2477 if (is_legacy(&tbl1->rate)) { 2478 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2479 2480 if (tid != IWL_MAX_TID_COUNT) { 2481 tid_data = &sta_priv->tid_data[tid]; 2482 if (tid_data->state != IWL_AGG_OFF) { 2483 IWL_DEBUG_RATE(mvm, 2484 "Stop aggregation on tid %d\n", 2485 tid); 2486 ieee80211_stop_tx_ba_session(sta, tid); 2487 } 2488 } 2489 rs_set_stay_in_table(mvm, 1, lq_sta); 2490 } else { 2491 /* If we're in an HT mode, and all 3 mode switch actions 2492 * have been tried and compared, stay in this best modulation 2493 * mode for a while before next round of mode comparisons. */ 2494 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2495 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2496 (tid != IWL_MAX_TID_COUNT)) { 2497 tid_data = &sta_priv->tid_data[tid]; 2498 if (tid_data->state == IWL_AGG_OFF) { 2499 IWL_DEBUG_RATE(mvm, 2500 "try to aggregate tid %d\n", 2501 tid); 2502 rs_tl_turn_on_agg(mvm, tid, 2503 lq_sta, sta); 2504 } 2505 } 2506 rs_set_stay_in_table(mvm, 0, lq_sta); 2507 } 2508 } 2509 } 2510 2511 struct rs_init_rate_info { 2512 s8 rssi; 2513 u8 rate_idx; 2514 }; 2515 2516 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2517 { -60, IWL_RATE_54M_INDEX }, 2518 { -64, IWL_RATE_48M_INDEX }, 2519 { -68, IWL_RATE_36M_INDEX }, 2520 { -80, IWL_RATE_24M_INDEX }, 2521 { -84, IWL_RATE_18M_INDEX }, 2522 { -85, IWL_RATE_12M_INDEX }, 2523 { -86, IWL_RATE_11M_INDEX }, 2524 { -88, IWL_RATE_5M_INDEX }, 2525 { -90, IWL_RATE_2M_INDEX }, 2526 { S8_MIN, IWL_RATE_1M_INDEX }, 2527 }; 2528 2529 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2530 { -60, IWL_RATE_54M_INDEX }, 2531 { -64, IWL_RATE_48M_INDEX }, 2532 { -72, IWL_RATE_36M_INDEX }, 2533 { -80, IWL_RATE_24M_INDEX }, 2534 { -84, IWL_RATE_18M_INDEX }, 2535 { -85, IWL_RATE_12M_INDEX }, 2536 { -87, IWL_RATE_9M_INDEX }, 2537 { S8_MIN, IWL_RATE_6M_INDEX }, 2538 }; 2539 2540 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2541 { -60, IWL_RATE_MCS_7_INDEX }, 2542 { -64, IWL_RATE_MCS_6_INDEX }, 2543 { -68, IWL_RATE_MCS_5_INDEX }, 2544 { -72, IWL_RATE_MCS_4_INDEX }, 2545 { -80, IWL_RATE_MCS_3_INDEX }, 2546 { -84, IWL_RATE_MCS_2_INDEX }, 2547 { -85, IWL_RATE_MCS_1_INDEX }, 2548 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2549 }; 2550 2551 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2552 { -60, IWL_RATE_MCS_8_INDEX }, 2553 { -64, IWL_RATE_MCS_7_INDEX }, 2554 { -68, IWL_RATE_MCS_6_INDEX }, 2555 { -72, IWL_RATE_MCS_5_INDEX }, 2556 { -80, IWL_RATE_MCS_4_INDEX }, 2557 { -84, IWL_RATE_MCS_3_INDEX }, 2558 { -85, IWL_RATE_MCS_2_INDEX }, 2559 { -87, IWL_RATE_MCS_1_INDEX }, 2560 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2561 }; 2562 2563 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = { 2564 { -60, IWL_RATE_MCS_9_INDEX }, 2565 { -64, IWL_RATE_MCS_8_INDEX }, 2566 { -68, IWL_RATE_MCS_7_INDEX }, 2567 { -72, IWL_RATE_MCS_6_INDEX }, 2568 { -80, IWL_RATE_MCS_5_INDEX }, 2569 { -84, IWL_RATE_MCS_4_INDEX }, 2570 { -85, IWL_RATE_MCS_3_INDEX }, 2571 { -87, IWL_RATE_MCS_2_INDEX }, 2572 { -88, IWL_RATE_MCS_1_INDEX }, 2573 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2574 }; 2575 2576 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2577 2578 /* Init the optimal rate based on STA caps 2579 * This combined with rssi is used to report the last tx rate 2580 * to userspace when we haven't transmitted enough frames. 2581 */ 2582 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2583 struct ieee80211_sta *sta, 2584 struct iwl_lq_sta *lq_sta) 2585 { 2586 struct rs_rate *rate = &lq_sta->optimal_rate; 2587 2588 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2589 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2590 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2591 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2592 else if (lq_sta->band == IEEE80211_BAND_5GHZ) 2593 rate->type = LQ_LEGACY_A; 2594 else 2595 rate->type = LQ_LEGACY_G; 2596 2597 rate->bw = rs_bw_from_sta_bw(sta); 2598 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2599 2600 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2601 2602 if (is_mimo(rate)) { 2603 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2604 } else if (is_siso(rate)) { 2605 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2606 } else { 2607 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2608 2609 if (lq_sta->band == IEEE80211_BAND_5GHZ) { 2610 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2611 lq_sta->optimal_nentries = 2612 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2613 } else { 2614 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2615 lq_sta->optimal_nentries = 2616 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2617 } 2618 } 2619 2620 if (is_vht(rate)) { 2621 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2622 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2623 lq_sta->optimal_nentries = 2624 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2625 } else { 2626 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz; 2627 lq_sta->optimal_nentries = 2628 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2629 } 2630 } else if (is_ht(rate)) { 2631 lq_sta->optimal_rates = rs_optimal_rates_ht; 2632 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2633 } 2634 } 2635 2636 /* Compute the optimal rate index based on RSSI */ 2637 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2638 struct iwl_lq_sta *lq_sta) 2639 { 2640 struct rs_rate *rate = &lq_sta->optimal_rate; 2641 int i; 2642 2643 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2644 BITS_PER_LONG); 2645 2646 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2647 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2648 2649 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2650 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2651 rate->index = rate_idx; 2652 break; 2653 } 2654 } 2655 2656 return rate; 2657 } 2658 2659 /* Choose an initial legacy rate and antenna to use based on the RSSI 2660 * of last Rx 2661 */ 2662 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2663 struct ieee80211_sta *sta, 2664 struct iwl_lq_sta *lq_sta, 2665 enum ieee80211_band band, 2666 struct rs_rate *rate) 2667 { 2668 int i, nentries; 2669 unsigned long active_rate; 2670 s8 best_rssi = S8_MIN; 2671 u8 best_ant = ANT_NONE; 2672 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2673 const struct rs_init_rate_info *initial_rates; 2674 2675 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2676 if (!(lq_sta->pers.chains & BIT(i))) 2677 continue; 2678 2679 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2680 best_rssi = lq_sta->pers.chain_signal[i]; 2681 best_ant = BIT(i); 2682 } 2683 } 2684 2685 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2686 rs_pretty_ant(best_ant), best_rssi); 2687 2688 if (best_ant != ANT_A && best_ant != ANT_B) 2689 rate->ant = first_antenna(valid_tx_ant); 2690 else 2691 rate->ant = best_ant; 2692 2693 rate->sgi = false; 2694 rate->ldpc = false; 2695 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2696 2697 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2698 BITS_PER_LONG); 2699 2700 if (band == IEEE80211_BAND_5GHZ) { 2701 rate->type = LQ_LEGACY_A; 2702 initial_rates = rs_optimal_rates_5ghz_legacy; 2703 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2704 } else { 2705 rate->type = LQ_LEGACY_G; 2706 initial_rates = rs_optimal_rates_24ghz_legacy; 2707 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2708 } 2709 2710 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2711 goto out; 2712 2713 /* Start from a higher rate if the corresponding debug capability 2714 * is enabled. The rate is chosen according to AP capabilities. 2715 * In case of VHT/HT when the rssi is low fallback to the case of 2716 * legacy rates. 2717 */ 2718 if (sta->vht_cap.vht_supported && 2719 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2720 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) { 2721 initial_rates = rs_optimal_rates_vht_40_80mhz; 2722 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2723 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 2724 rate->bw = RATE_MCS_CHAN_WIDTH_80; 2725 else 2726 rate->bw = RATE_MCS_CHAN_WIDTH_40; 2727 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) { 2728 initial_rates = rs_optimal_rates_vht_20mhz; 2729 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2730 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2731 } else { 2732 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2733 goto out; 2734 } 2735 active_rate = lq_sta->active_siso_rate; 2736 rate->type = LQ_VHT_SISO; 2737 } else if (sta->ht_cap.ht_supported && 2738 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2739 initial_rates = rs_optimal_rates_ht; 2740 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2741 active_rate = lq_sta->active_siso_rate; 2742 rate->type = LQ_HT_SISO; 2743 } else { 2744 active_rate = lq_sta->active_legacy_rate; 2745 } 2746 2747 for (i = 0; i < nentries; i++) { 2748 int rate_idx = initial_rates[i].rate_idx; 2749 2750 if ((best_rssi >= initial_rates[i].rssi) && 2751 (BIT(rate_idx) & active_rate)) { 2752 rate->index = rate_idx; 2753 break; 2754 } 2755 } 2756 2757 out: 2758 rs_dump_rate(mvm, rate, "INITIAL"); 2759 } 2760 2761 /* Save info about RSSI of last Rx */ 2762 void rs_update_last_rssi(struct iwl_mvm *mvm, 2763 struct iwl_lq_sta *lq_sta, 2764 struct ieee80211_rx_status *rx_status) 2765 { 2766 int i; 2767 2768 lq_sta->pers.chains = rx_status->chains; 2769 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2770 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2771 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2772 lq_sta->pers.last_rssi = S8_MIN; 2773 2774 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2775 if (!(lq_sta->pers.chains & BIT(i))) 2776 continue; 2777 2778 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2779 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2780 } 2781 } 2782 2783 /** 2784 * rs_initialize_lq - Initialize a station's hardware rate table 2785 * 2786 * The uCode's station table contains a table of fallback rates 2787 * for automatic fallback during transmission. 2788 * 2789 * NOTE: This sets up a default set of values. These will be replaced later 2790 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2791 * rc80211_simple. 2792 * 2793 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2794 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2795 * which requires station table entry to exist). 2796 */ 2797 static void rs_initialize_lq(struct iwl_mvm *mvm, 2798 struct ieee80211_sta *sta, 2799 struct iwl_lq_sta *lq_sta, 2800 enum ieee80211_band band, 2801 bool init) 2802 { 2803 struct iwl_scale_tbl_info *tbl; 2804 struct rs_rate *rate; 2805 u8 active_tbl = 0; 2806 2807 if (!sta || !lq_sta) 2808 return; 2809 2810 if (!lq_sta->search_better_tbl) 2811 active_tbl = lq_sta->active_tbl; 2812 else 2813 active_tbl = 1 - lq_sta->active_tbl; 2814 2815 tbl = &(lq_sta->lq_info[active_tbl]); 2816 rate = &tbl->rate; 2817 2818 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2819 rs_init_optimal_rate(mvm, sta, lq_sta); 2820 2821 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2822 tbl->column = rs_get_column_from_rate(rate); 2823 2824 rs_set_expected_tpt_table(lq_sta, tbl); 2825 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2826 /* TODO restore station should remember the lq cmd */ 2827 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2828 } 2829 2830 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2831 struct ieee80211_tx_rate_control *txrc) 2832 { 2833 struct sk_buff *skb = txrc->skb; 2834 struct iwl_op_mode *op_mode __maybe_unused = 2835 (struct iwl_op_mode *)mvm_r; 2836 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2838 struct iwl_lq_sta *lq_sta = mvm_sta; 2839 struct rs_rate *optimal_rate; 2840 u32 last_ucode_rate; 2841 2842 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2843 /* if vif isn't initialized mvm doesn't know about 2844 * this station, so don't do anything with the it 2845 */ 2846 sta = NULL; 2847 mvm_sta = NULL; 2848 } 2849 2850 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2851 2852 /* Treat uninitialized rate scaling data same as non-existing. */ 2853 if (lq_sta && !lq_sta->pers.drv) { 2854 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2855 mvm_sta = NULL; 2856 } 2857 2858 /* Send management frames and NO_ACK data using lowest rate. */ 2859 if (rate_control_send_low(sta, mvm_sta, txrc)) 2860 return; 2861 2862 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2863 info->band, &info->control.rates[0]); 2864 info->control.rates[0].count = 1; 2865 2866 /* Report the optimal rate based on rssi and STA caps if we haven't 2867 * converged yet (too little traffic) or exploring other modulations 2868 */ 2869 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2870 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2871 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2872 optimal_rate); 2873 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2874 &txrc->reported_rate); 2875 } 2876 } 2877 2878 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2879 gfp_t gfp) 2880 { 2881 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2882 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2883 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2884 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2885 2886 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2887 2888 lq_sta->pers.drv = mvm; 2889 #ifdef CONFIG_MAC80211_DEBUGFS 2890 lq_sta->pers.dbg_fixed_rate = 0; 2891 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2892 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2893 #endif 2894 lq_sta->pers.chains = 0; 2895 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2896 lq_sta->pers.last_rssi = S8_MIN; 2897 2898 return &sta_priv->lq_sta; 2899 } 2900 2901 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2902 int nss) 2903 { 2904 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2905 (0x3 << (2 * (nss - 1))); 2906 rx_mcs >>= (2 * (nss - 1)); 2907 2908 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2909 return IWL_RATE_MCS_7_INDEX; 2910 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2911 return IWL_RATE_MCS_8_INDEX; 2912 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2913 return IWL_RATE_MCS_9_INDEX; 2914 2915 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2916 return -1; 2917 } 2918 2919 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2920 struct ieee80211_sta_vht_cap *vht_cap, 2921 struct iwl_lq_sta *lq_sta) 2922 { 2923 int i; 2924 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2925 2926 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2927 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2928 if (i == IWL_RATE_9M_INDEX) 2929 continue; 2930 2931 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2932 if (i == IWL_RATE_MCS_9_INDEX && 2933 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2934 continue; 2935 2936 lq_sta->active_siso_rate |= BIT(i); 2937 } 2938 } 2939 2940 if (sta->rx_nss < 2) 2941 return; 2942 2943 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2944 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2945 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2946 if (i == IWL_RATE_9M_INDEX) 2947 continue; 2948 2949 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2950 if (i == IWL_RATE_MCS_9_INDEX && 2951 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2952 continue; 2953 2954 lq_sta->active_mimo2_rate |= BIT(i); 2955 } 2956 } 2957 } 2958 2959 static void rs_ht_init(struct iwl_mvm *mvm, 2960 struct ieee80211_sta *sta, 2961 struct iwl_lq_sta *lq_sta, 2962 struct ieee80211_sta_ht_cap *ht_cap) 2963 { 2964 /* active_siso_rate mask includes 9 MBits (bit 5), 2965 * and CCK (bits 0-3), supp_rates[] does not; 2966 * shift to convert format, force 9 MBits off. 2967 */ 2968 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2969 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2970 lq_sta->active_siso_rate &= ~((u16)0x2); 2971 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2972 2973 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2974 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2975 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2976 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2977 2978 if (mvm->cfg->ht_params->ldpc && 2979 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2980 lq_sta->ldpc = true; 2981 2982 if (mvm->cfg->ht_params->stbc && 2983 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2984 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2985 lq_sta->stbc_capable = true; 2986 2987 lq_sta->is_vht = false; 2988 } 2989 2990 static void rs_vht_init(struct iwl_mvm *mvm, 2991 struct ieee80211_sta *sta, 2992 struct iwl_lq_sta *lq_sta, 2993 struct ieee80211_sta_vht_cap *vht_cap) 2994 { 2995 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2996 2997 if (mvm->cfg->ht_params->ldpc && 2998 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2999 lq_sta->ldpc = true; 3000 3001 if (mvm->cfg->ht_params->stbc && 3002 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3003 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3004 lq_sta->stbc_capable = true; 3005 3006 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3007 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3008 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3009 lq_sta->bfer_capable = true; 3010 3011 lq_sta->is_vht = true; 3012 } 3013 3014 #ifdef CONFIG_IWLWIFI_DEBUGFS 3015 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3016 { 3017 spin_lock_bh(&mvm->drv_stats_lock); 3018 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3019 spin_unlock_bh(&mvm->drv_stats_lock); 3020 } 3021 3022 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3023 { 3024 u8 nss = 0, mcs = 0; 3025 3026 spin_lock(&mvm->drv_stats_lock); 3027 3028 if (agg) 3029 mvm->drv_rx_stats.agg_frames++; 3030 3031 mvm->drv_rx_stats.success_frames++; 3032 3033 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3034 case RATE_MCS_CHAN_WIDTH_20: 3035 mvm->drv_rx_stats.bw_20_frames++; 3036 break; 3037 case RATE_MCS_CHAN_WIDTH_40: 3038 mvm->drv_rx_stats.bw_40_frames++; 3039 break; 3040 case RATE_MCS_CHAN_WIDTH_80: 3041 mvm->drv_rx_stats.bw_80_frames++; 3042 break; 3043 default: 3044 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3045 } 3046 3047 if (rate & RATE_MCS_HT_MSK) { 3048 mvm->drv_rx_stats.ht_frames++; 3049 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; 3050 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3051 } else if (rate & RATE_MCS_VHT_MSK) { 3052 mvm->drv_rx_stats.vht_frames++; 3053 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3054 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3055 RATE_VHT_MCS_NSS_POS) + 1; 3056 } else { 3057 mvm->drv_rx_stats.legacy_frames++; 3058 } 3059 3060 if (nss == 1) 3061 mvm->drv_rx_stats.siso_frames++; 3062 else if (nss == 2) 3063 mvm->drv_rx_stats.mimo2_frames++; 3064 3065 if (rate & RATE_MCS_SGI_MSK) 3066 mvm->drv_rx_stats.sgi_frames++; 3067 else 3068 mvm->drv_rx_stats.ngi_frames++; 3069 3070 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3071 mvm->drv_rx_stats.last_frame_idx = 3072 (mvm->drv_rx_stats.last_frame_idx + 1) % 3073 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3074 3075 spin_unlock(&mvm->drv_stats_lock); 3076 } 3077 #endif 3078 3079 /* 3080 * Called after adding a new station to initialize rate scaling 3081 */ 3082 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3083 enum ieee80211_band band, bool init) 3084 { 3085 int i, j; 3086 struct ieee80211_hw *hw = mvm->hw; 3087 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3088 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3089 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3090 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3091 struct ieee80211_supported_band *sband; 3092 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3093 3094 /* clear all non-persistent lq data */ 3095 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3096 3097 sband = hw->wiphy->bands[band]; 3098 3099 lq_sta->lq.sta_id = sta_priv->sta_id; 3100 3101 for (j = 0; j < LQ_SIZE; j++) 3102 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3103 3104 lq_sta->flush_timer = 0; 3105 lq_sta->last_tx = jiffies; 3106 3107 IWL_DEBUG_RATE(mvm, 3108 "LQ: *** rate scale station global init for station %d ***\n", 3109 sta_priv->sta_id); 3110 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3111 * the lowest or the highest rate.. Could consider using RSSI from 3112 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3113 * after assoc.. */ 3114 3115 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3116 lq_sta->band = sband->band; 3117 /* 3118 * active legacy rates as per supported rates bitmap 3119 */ 3120 supp = sta->supp_rates[sband->band]; 3121 lq_sta->active_legacy_rate = 0; 3122 for_each_set_bit(i, &supp, BITS_PER_LONG) 3123 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3124 3125 /* TODO: should probably account for rx_highest for both HT/VHT */ 3126 if (!vht_cap || !vht_cap->vht_supported) 3127 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3128 else 3129 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3130 3131 lq_sta->max_legacy_rate_idx = 3132 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3133 lq_sta->max_siso_rate_idx = 3134 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3135 lq_sta->max_mimo2_rate_idx = 3136 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3137 3138 IWL_DEBUG_RATE(mvm, 3139 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3140 lq_sta->active_legacy_rate, 3141 lq_sta->active_siso_rate, 3142 lq_sta->active_mimo2_rate, 3143 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3144 lq_sta->bfer_capable); 3145 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3146 lq_sta->max_legacy_rate_idx, 3147 lq_sta->max_siso_rate_idx, 3148 lq_sta->max_mimo2_rate_idx); 3149 3150 /* These values will be overridden later */ 3151 lq_sta->lq.single_stream_ant_msk = 3152 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3153 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3154 3155 /* as default allow aggregation for all tids */ 3156 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3157 lq_sta->is_agg = 0; 3158 #ifdef CONFIG_IWLWIFI_DEBUGFS 3159 iwl_mvm_reset_frame_stats(mvm); 3160 #endif 3161 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3162 } 3163 3164 static void rs_rate_update(void *mvm_r, 3165 struct ieee80211_supported_band *sband, 3166 struct cfg80211_chan_def *chandef, 3167 struct ieee80211_sta *sta, void *priv_sta, 3168 u32 changed) 3169 { 3170 u8 tid; 3171 struct iwl_op_mode *op_mode = 3172 (struct iwl_op_mode *)mvm_r; 3173 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3174 3175 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3176 return; 3177 3178 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3179 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3180 ieee80211_stop_tx_ba_session(sta, tid); 3181 3182 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3183 } 3184 3185 #ifdef CONFIG_MAC80211_DEBUGFS 3186 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3187 struct iwl_lq_cmd *lq_cmd, 3188 enum ieee80211_band band, 3189 u32 ucode_rate) 3190 { 3191 struct rs_rate rate; 3192 int i; 3193 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3194 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3195 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3196 3197 for (i = 0; i < num_rates; i++) 3198 lq_cmd->rs_table[i] = ucode_rate_le32; 3199 3200 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3201 3202 if (is_mimo(&rate)) 3203 lq_cmd->mimo_delim = num_rates - 1; 3204 else 3205 lq_cmd->mimo_delim = 0; 3206 3207 lq_cmd->reduced_tpc = 0; 3208 3209 if (num_of_ant(ant) == 1) 3210 lq_cmd->single_stream_ant_msk = ant; 3211 3212 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3213 } 3214 #endif /* CONFIG_MAC80211_DEBUGFS */ 3215 3216 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3217 struct iwl_lq_sta *lq_sta, 3218 struct rs_rate *rate, 3219 __le32 *rs_table, int *rs_table_index, 3220 int num_rates, int num_retries, 3221 u8 valid_tx_ant, bool toggle_ant) 3222 { 3223 int i, j; 3224 __le32 ucode_rate; 3225 bool bottom_reached = false; 3226 int prev_rate_idx = rate->index; 3227 int end = LINK_QUAL_MAX_RETRY_NUM; 3228 int index = *rs_table_index; 3229 3230 for (i = 0; i < num_rates && index < end; i++) { 3231 for (j = 0; j < num_retries && index < end; j++, index++) { 3232 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3233 rate)); 3234 rs_table[index] = ucode_rate; 3235 if (toggle_ant) 3236 rs_toggle_antenna(valid_tx_ant, rate); 3237 } 3238 3239 prev_rate_idx = rate->index; 3240 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3241 if (bottom_reached && !is_legacy(rate)) 3242 break; 3243 } 3244 3245 if (!bottom_reached && !is_legacy(rate)) 3246 rate->index = prev_rate_idx; 3247 3248 *rs_table_index = index; 3249 } 3250 3251 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3252 * column the rate table should look like this: 3253 * 3254 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3255 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3256 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3257 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3258 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3259 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3260 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3261 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3262 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3263 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3264 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3265 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3266 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3267 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3268 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3269 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3270 */ 3271 static void rs_build_rates_table(struct iwl_mvm *mvm, 3272 struct ieee80211_sta *sta, 3273 struct iwl_lq_sta *lq_sta, 3274 const struct rs_rate *initial_rate) 3275 { 3276 struct rs_rate rate; 3277 int num_rates, num_retries, index = 0; 3278 u8 valid_tx_ant = 0; 3279 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3280 bool toggle_ant = false; 3281 3282 memcpy(&rate, initial_rate, sizeof(rate)); 3283 3284 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3285 3286 /* TODO: remove old API when min FW API hits 14 */ 3287 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3288 rs_stbc_allow(mvm, sta, lq_sta)) 3289 rate.stbc = true; 3290 3291 if (is_siso(&rate)) { 3292 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3293 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3294 } else if (is_mimo(&rate)) { 3295 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3296 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3297 } else { 3298 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3299 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3300 toggle_ant = true; 3301 } 3302 3303 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3304 num_rates, num_retries, valid_tx_ant, 3305 toggle_ant); 3306 3307 rs_get_lower_rate_down_column(lq_sta, &rate); 3308 3309 if (is_siso(&rate)) { 3310 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3311 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3312 lq_cmd->mimo_delim = index; 3313 } else if (is_legacy(&rate)) { 3314 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3315 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3316 } else { 3317 WARN_ON_ONCE(1); 3318 } 3319 3320 toggle_ant = true; 3321 3322 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3323 num_rates, num_retries, valid_tx_ant, 3324 toggle_ant); 3325 3326 rs_get_lower_rate_down_column(lq_sta, &rate); 3327 3328 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3329 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3330 3331 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3332 num_rates, num_retries, valid_tx_ant, 3333 toggle_ant); 3334 3335 } 3336 3337 struct rs_bfer_active_iter_data { 3338 struct ieee80211_sta *exclude_sta; 3339 struct iwl_mvm_sta *bfer_mvmsta; 3340 }; 3341 3342 static void rs_bfer_active_iter(void *_data, 3343 struct ieee80211_sta *sta) 3344 { 3345 struct rs_bfer_active_iter_data *data = _data; 3346 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3347 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3348 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3349 3350 if (sta == data->exclude_sta) 3351 return; 3352 3353 /* The current sta has BFER allowed */ 3354 if (ss_params & LQ_SS_BFER_ALLOWED) { 3355 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3356 3357 data->bfer_mvmsta = mvmsta; 3358 } 3359 } 3360 3361 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3362 { 3363 int prio = -1; 3364 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3365 3366 switch (viftype) { 3367 case NL80211_IFTYPE_AP: 3368 case NL80211_IFTYPE_P2P_GO: 3369 prio = 3; 3370 break; 3371 case NL80211_IFTYPE_P2P_CLIENT: 3372 prio = 2; 3373 break; 3374 case NL80211_IFTYPE_STATION: 3375 prio = 1; 3376 break; 3377 default: 3378 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3379 prio = -1; 3380 } 3381 3382 return prio; 3383 } 3384 3385 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3386 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3387 struct iwl_mvm_sta *sta2) 3388 { 3389 int prio1 = rs_bfer_priority(sta1); 3390 int prio2 = rs_bfer_priority(sta2); 3391 3392 if (prio1 > prio2) 3393 return 1; 3394 if (prio1 < prio2) 3395 return -1; 3396 return 0; 3397 } 3398 3399 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3400 struct ieee80211_sta *sta, 3401 struct iwl_lq_sta *lq_sta, 3402 const struct rs_rate *initial_rate) 3403 { 3404 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3405 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3406 struct rs_bfer_active_iter_data data = { 3407 .exclude_sta = sta, 3408 .bfer_mvmsta = NULL, 3409 }; 3410 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3411 u32 ss_params = LQ_SS_PARAMS_VALID; 3412 3413 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3414 goto out; 3415 3416 #ifdef CONFIG_MAC80211_DEBUGFS 3417 /* Check if forcing the decision is configured. 3418 * Note that SISO is forced by not allowing STBC or BFER 3419 */ 3420 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3421 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3422 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3423 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3424 3425 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3426 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3427 lq_sta->pers.ss_force); 3428 goto out; 3429 } 3430 #endif 3431 3432 if (lq_sta->stbc_capable) 3433 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3434 3435 if (!lq_sta->bfer_capable) 3436 goto out; 3437 3438 ieee80211_iterate_stations_atomic(mvm->hw, 3439 rs_bfer_active_iter, 3440 &data); 3441 bfer_mvmsta = data.bfer_mvmsta; 3442 3443 /* This code is safe as it doesn't run concurrently for different 3444 * stations. This is guaranteed by the fact that calls to 3445 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3446 */ 3447 if (!bfer_mvmsta) { 3448 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3449 3450 ss_params |= LQ_SS_BFER_ALLOWED; 3451 goto out; 3452 } 3453 3454 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3455 bfer_mvmsta->sta_id); 3456 3457 /* Disallow BFER on another STA if active and we're a higher priority */ 3458 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3459 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3460 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3461 3462 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3463 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3464 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3465 3466 ss_params |= LQ_SS_BFER_ALLOWED; 3467 IWL_DEBUG_RATE(mvm, 3468 "Lower priority BFER sta found (%d). Switch BFER\n", 3469 bfer_mvmsta->sta_id); 3470 } 3471 out: 3472 lq_cmd->ss_params = cpu_to_le32(ss_params); 3473 } 3474 3475 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3476 struct ieee80211_sta *sta, 3477 struct iwl_lq_sta *lq_sta, 3478 const struct rs_rate *initial_rate) 3479 { 3480 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3481 struct iwl_mvm_sta *mvmsta; 3482 struct iwl_mvm_vif *mvmvif; 3483 3484 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3485 lq_cmd->agg_time_limit = 3486 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3487 3488 #ifdef CONFIG_MAC80211_DEBUGFS 3489 if (lq_sta->pers.dbg_fixed_rate) { 3490 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3491 lq_sta->band, 3492 lq_sta->pers.dbg_fixed_rate); 3493 return; 3494 } 3495 #endif 3496 if (WARN_ON_ONCE(!sta || !initial_rate)) 3497 return; 3498 3499 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3500 3501 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3502 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3503 3504 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3505 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3506 3507 if (num_of_ant(initial_rate->ant) == 1) 3508 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3509 3510 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3511 3512 /* 3513 * In case of low latency, tell the firmware to leave a frame in the 3514 * Tx Fifo so that it can start a transaction in the same TxOP. This 3515 * basically allows the firmware to send bursts. 3516 */ 3517 if (iwl_mvm_vif_low_latency(mvmvif)) 3518 lq_cmd->agg_frame_cnt_limit--; 3519 3520 if (mvmsta->vif->p2p) 3521 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3522 3523 lq_cmd->agg_time_limit = 3524 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3525 } 3526 3527 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3528 { 3529 return hw->priv; 3530 } 3531 /* rate scale requires free function to be implemented */ 3532 static void rs_free(void *mvm_rate) 3533 { 3534 return; 3535 } 3536 3537 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3538 void *mvm_sta) 3539 { 3540 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3541 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3542 3543 IWL_DEBUG_RATE(mvm, "enter\n"); 3544 IWL_DEBUG_RATE(mvm, "leave\n"); 3545 } 3546 3547 #ifdef CONFIG_MAC80211_DEBUGFS 3548 int rs_pretty_print_rate(char *buf, const u32 rate) 3549 { 3550 3551 char *type, *bw; 3552 u8 mcs = 0, nss = 0; 3553 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3554 3555 if (!(rate & RATE_MCS_HT_MSK) && 3556 !(rate & RATE_MCS_VHT_MSK)) { 3557 int index = iwl_hwrate_to_plcp_idx(rate); 3558 3559 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3560 rs_pretty_ant(ant), 3561 index == IWL_RATE_INVALID ? "BAD" : 3562 iwl_rate_mcs[index].mbps); 3563 } 3564 3565 if (rate & RATE_MCS_VHT_MSK) { 3566 type = "VHT"; 3567 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3568 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3569 >> RATE_VHT_MCS_NSS_POS) + 1; 3570 } else if (rate & RATE_MCS_HT_MSK) { 3571 type = "HT"; 3572 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3573 } else { 3574 type = "Unknown"; /* shouldn't happen */ 3575 } 3576 3577 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3578 case RATE_MCS_CHAN_WIDTH_20: 3579 bw = "20Mhz"; 3580 break; 3581 case RATE_MCS_CHAN_WIDTH_40: 3582 bw = "40Mhz"; 3583 break; 3584 case RATE_MCS_CHAN_WIDTH_80: 3585 bw = "80Mhz"; 3586 break; 3587 case RATE_MCS_CHAN_WIDTH_160: 3588 bw = "160Mhz"; 3589 break; 3590 default: 3591 bw = "BAD BW"; 3592 } 3593 3594 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", 3595 type, rs_pretty_ant(ant), bw, mcs, nss, 3596 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3597 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3598 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3599 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3600 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3601 } 3602 3603 /** 3604 * Program the device to use fixed rate for frame transmit 3605 * This is for debugging/testing only 3606 * once the device start use fixed rate, we need to reload the module 3607 * to being back the normal operation. 3608 */ 3609 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3610 struct iwl_lq_sta *lq_sta) 3611 { 3612 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3613 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3614 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3615 3616 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3617 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3618 3619 if (lq_sta->pers.dbg_fixed_rate) { 3620 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3621 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3622 } 3623 } 3624 3625 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3626 const char __user *user_buf, size_t count, loff_t *ppos) 3627 { 3628 struct iwl_lq_sta *lq_sta = file->private_data; 3629 struct iwl_mvm *mvm; 3630 char buf[64]; 3631 size_t buf_size; 3632 u32 parsed_rate; 3633 3634 mvm = lq_sta->pers.drv; 3635 memset(buf, 0, sizeof(buf)); 3636 buf_size = min(count, sizeof(buf) - 1); 3637 if (copy_from_user(buf, user_buf, buf_size)) 3638 return -EFAULT; 3639 3640 if (sscanf(buf, "%x", &parsed_rate) == 1) 3641 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3642 else 3643 lq_sta->pers.dbg_fixed_rate = 0; 3644 3645 rs_program_fix_rate(mvm, lq_sta); 3646 3647 return count; 3648 } 3649 3650 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3651 char __user *user_buf, size_t count, loff_t *ppos) 3652 { 3653 char *buff; 3654 int desc = 0; 3655 int i = 0; 3656 ssize_t ret; 3657 3658 struct iwl_lq_sta *lq_sta = file->private_data; 3659 struct iwl_mvm *mvm; 3660 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3661 struct rs_rate *rate = &tbl->rate; 3662 u32 ss_params; 3663 mvm = lq_sta->pers.drv; 3664 buff = kmalloc(2048, GFP_KERNEL); 3665 if (!buff) 3666 return -ENOMEM; 3667 3668 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3669 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3670 lq_sta->total_failed, lq_sta->total_success, 3671 lq_sta->active_legacy_rate); 3672 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3673 lq_sta->pers.dbg_fixed_rate); 3674 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3675 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3676 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3677 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3678 desc += sprintf(buff+desc, "lq type %s\n", 3679 (is_legacy(rate)) ? "legacy" : 3680 is_vht(rate) ? "VHT" : "HT"); 3681 if (!is_legacy(rate)) { 3682 desc += sprintf(buff + desc, " %s", 3683 (is_siso(rate)) ? "SISO" : "MIMO2"); 3684 desc += sprintf(buff + desc, " %s", 3685 (is_ht20(rate)) ? "20MHz" : 3686 (is_ht40(rate)) ? "40MHz" : 3687 (is_ht80(rate)) ? "80Mhz" : "BAD BW"); 3688 desc += sprintf(buff + desc, " %s %s %s\n", 3689 (rate->sgi) ? "SGI" : "NGI", 3690 (rate->ldpc) ? "LDPC" : "BCC", 3691 (lq_sta->is_agg) ? "AGG on" : ""); 3692 } 3693 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3694 lq_sta->last_rate_n_flags); 3695 desc += sprintf(buff+desc, 3696 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3697 lq_sta->lq.flags, 3698 lq_sta->lq.mimo_delim, 3699 lq_sta->lq.single_stream_ant_msk, 3700 lq_sta->lq.dual_stream_ant_msk); 3701 3702 desc += sprintf(buff+desc, 3703 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3704 le16_to_cpu(lq_sta->lq.agg_time_limit), 3705 lq_sta->lq.agg_disable_start_th, 3706 lq_sta->lq.agg_frame_cnt_limit); 3707 3708 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3709 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3710 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3711 (ss_params & LQ_SS_PARAMS_VALID) ? 3712 "VALID" : "INVALID", 3713 (ss_params & LQ_SS_BFER_ALLOWED) ? 3714 ", BFER" : "", 3715 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3716 ", STBC" : "", 3717 (ss_params & LQ_SS_FORCE) ? 3718 ", FORCE" : ""); 3719 desc += sprintf(buff+desc, 3720 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3721 lq_sta->lq.initial_rate_index[0], 3722 lq_sta->lq.initial_rate_index[1], 3723 lq_sta->lq.initial_rate_index[2], 3724 lq_sta->lq.initial_rate_index[3]); 3725 3726 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3727 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3728 3729 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3730 desc += rs_pretty_print_rate(buff+desc, r); 3731 } 3732 3733 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3734 kfree(buff); 3735 return ret; 3736 } 3737 3738 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3739 .write = rs_sta_dbgfs_scale_table_write, 3740 .read = rs_sta_dbgfs_scale_table_read, 3741 .open = simple_open, 3742 .llseek = default_llseek, 3743 }; 3744 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3745 char __user *user_buf, size_t count, loff_t *ppos) 3746 { 3747 char *buff; 3748 int desc = 0; 3749 int i, j; 3750 ssize_t ret; 3751 struct iwl_scale_tbl_info *tbl; 3752 struct rs_rate *rate; 3753 struct iwl_lq_sta *lq_sta = file->private_data; 3754 3755 buff = kmalloc(1024, GFP_KERNEL); 3756 if (!buff) 3757 return -ENOMEM; 3758 3759 for (i = 0; i < LQ_SIZE; i++) { 3760 tbl = &(lq_sta->lq_info[i]); 3761 rate = &tbl->rate; 3762 desc += sprintf(buff+desc, 3763 "%s type=%d SGI=%d BW=%s DUP=0\n" 3764 "index=%d\n", 3765 lq_sta->active_tbl == i ? "*" : "x", 3766 rate->type, 3767 rate->sgi, 3768 is_ht20(rate) ? "20Mhz" : 3769 is_ht40(rate) ? "40Mhz" : 3770 is_ht80(rate) ? "80Mhz" : "ERR", 3771 rate->index); 3772 for (j = 0; j < IWL_RATE_COUNT; j++) { 3773 desc += sprintf(buff+desc, 3774 "counter=%d success=%d %%=%d\n", 3775 tbl->win[j].counter, 3776 tbl->win[j].success_counter, 3777 tbl->win[j].success_ratio); 3778 } 3779 } 3780 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3781 kfree(buff); 3782 return ret; 3783 } 3784 3785 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3786 .read = rs_sta_dbgfs_stats_table_read, 3787 .open = simple_open, 3788 .llseek = default_llseek, 3789 }; 3790 3791 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3792 char __user *user_buf, 3793 size_t count, loff_t *ppos) 3794 { 3795 static const char * const column_name[] = { 3796 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3797 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3798 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3799 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3800 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3801 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3802 [RS_COLUMN_MIMO2] = "MIMO2", 3803 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3804 }; 3805 3806 static const char * const rate_name[] = { 3807 [IWL_RATE_1M_INDEX] = "1M", 3808 [IWL_RATE_2M_INDEX] = "2M", 3809 [IWL_RATE_5M_INDEX] = "5.5M", 3810 [IWL_RATE_11M_INDEX] = "11M", 3811 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3812 [IWL_RATE_9M_INDEX] = "9M", 3813 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3814 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3815 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3816 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3817 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3818 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3819 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3820 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3821 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3822 }; 3823 3824 char *buff, *pos, *endpos; 3825 int col, rate; 3826 ssize_t ret; 3827 struct iwl_lq_sta *lq_sta = file->private_data; 3828 struct rs_rate_stats *stats; 3829 static const size_t bufsz = 1024; 3830 3831 buff = kmalloc(bufsz, GFP_KERNEL); 3832 if (!buff) 3833 return -ENOMEM; 3834 3835 pos = buff; 3836 endpos = pos + bufsz; 3837 3838 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3839 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3840 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3841 pos += scnprintf(pos, endpos - pos, "\n"); 3842 3843 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3844 pos += scnprintf(pos, endpos - pos, 3845 "%s,", column_name[col]); 3846 3847 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3848 stats = &(lq_sta->pers.tx_stats[col][rate]); 3849 pos += scnprintf(pos, endpos - pos, 3850 "%llu/%llu,", 3851 stats->success, 3852 stats->total); 3853 } 3854 pos += scnprintf(pos, endpos - pos, "\n"); 3855 } 3856 3857 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3858 kfree(buff); 3859 return ret; 3860 } 3861 3862 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3863 const char __user *user_buf, 3864 size_t count, loff_t *ppos) 3865 { 3866 struct iwl_lq_sta *lq_sta = file->private_data; 3867 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3868 3869 return count; 3870 } 3871 3872 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3873 .read = rs_sta_dbgfs_drv_tx_stats_read, 3874 .write = rs_sta_dbgfs_drv_tx_stats_write, 3875 .open = simple_open, 3876 .llseek = default_llseek, 3877 }; 3878 3879 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3880 char __user *user_buf, 3881 size_t count, loff_t *ppos) 3882 { 3883 struct iwl_lq_sta *lq_sta = file->private_data; 3884 char buf[12]; 3885 int bufsz = sizeof(buf); 3886 int pos = 0; 3887 static const char * const ss_force_name[] = { 3888 [RS_SS_FORCE_NONE] = "none", 3889 [RS_SS_FORCE_STBC] = "stbc", 3890 [RS_SS_FORCE_BFER] = "bfer", 3891 [RS_SS_FORCE_SISO] = "siso", 3892 }; 3893 3894 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3895 ss_force_name[lq_sta->pers.ss_force]); 3896 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3897 } 3898 3899 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3900 size_t count, loff_t *ppos) 3901 { 3902 struct iwl_mvm *mvm = lq_sta->pers.drv; 3903 int ret = 0; 3904 3905 if (!strncmp("none", buf, 4)) { 3906 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3907 } else if (!strncmp("siso", buf, 4)) { 3908 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3909 } else if (!strncmp("stbc", buf, 4)) { 3910 if (lq_sta->stbc_capable) { 3911 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3912 } else { 3913 IWL_ERR(mvm, 3914 "can't force STBC. peer doesn't support\n"); 3915 ret = -EINVAL; 3916 } 3917 } else if (!strncmp("bfer", buf, 4)) { 3918 if (lq_sta->bfer_capable) { 3919 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3920 } else { 3921 IWL_ERR(mvm, 3922 "can't force BFER. peer doesn't support\n"); 3923 ret = -EINVAL; 3924 } 3925 } else { 3926 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3927 ret = -EINVAL; 3928 } 3929 return ret ?: count; 3930 } 3931 3932 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3933 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3934 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3935 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3936 &iwl_dbgfs_##name##_ops)) \ 3937 goto err; \ 3938 } while (0) 3939 3940 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3941 3942 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3943 { 3944 struct iwl_lq_sta *lq_sta = priv_sta; 3945 struct iwl_mvm_sta *mvmsta; 3946 3947 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3948 3949 if (!mvmsta->vif) 3950 return; 3951 3952 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3953 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3954 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3955 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3956 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 3957 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 3958 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3959 &lq_sta->tx_agg_tid_en); 3960 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 3961 &lq_sta->pers.dbg_fixed_txp_reduction); 3962 3963 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 3964 return; 3965 err: 3966 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 3967 } 3968 3969 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 3970 { 3971 } 3972 #endif 3973 3974 /* 3975 * Initialization of rate scaling information is done by driver after 3976 * the station is added. Since mac80211 calls this function before a 3977 * station is added we ignore it. 3978 */ 3979 static void rs_rate_init_stub(void *mvm_r, 3980 struct ieee80211_supported_band *sband, 3981 struct cfg80211_chan_def *chandef, 3982 struct ieee80211_sta *sta, void *mvm_sta) 3983 { 3984 } 3985 3986 static const struct rate_control_ops rs_mvm_ops = { 3987 .name = RS_NAME, 3988 .tx_status = rs_mac80211_tx_status, 3989 .get_rate = rs_get_rate, 3990 .rate_init = rs_rate_init_stub, 3991 .alloc = rs_alloc, 3992 .free = rs_free, 3993 .alloc_sta = rs_alloc_sta, 3994 .free_sta = rs_free_sta, 3995 .rate_update = rs_rate_update, 3996 #ifdef CONFIG_MAC80211_DEBUGFS 3997 .add_sta_debugfs = rs_add_debugfs, 3998 .remove_sta_debugfs = rs_remove_debugfs, 3999 #endif 4000 }; 4001 4002 int iwl_mvm_rate_control_register(void) 4003 { 4004 return ieee80211_rate_control_register(&rs_mvm_ops); 4005 } 4006 4007 void iwl_mvm_rate_control_unregister(void) 4008 { 4009 ieee80211_rate_control_unregister(&rs_mvm_ops); 4010 } 4011 4012 /** 4013 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4014 * Tx protection, according to this request and previous requests, 4015 * and send the LQ command. 4016 * @mvmsta: The station 4017 * @enable: Enable Tx protection? 4018 */ 4019 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4020 bool enable) 4021 { 4022 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4023 4024 lockdep_assert_held(&mvm->mutex); 4025 4026 if (enable) { 4027 if (mvmsta->tx_protection == 0) 4028 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4029 mvmsta->tx_protection++; 4030 } else { 4031 mvmsta->tx_protection--; 4032 if (mvmsta->tx_protection == 0) 4033 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4034 } 4035 4036 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4037 } 4038