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_0_INDEX) && 560 (rate->index <= IWL_RATE_MCS_9_INDEX)) 561 rate_str = ht_vht_rates[rate->index]; 562 else 563 rate_str = "BAD_RATE"; 564 565 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 566 rs_pretty_ant(rate->ant), rate_str); 567 return buf; 568 } 569 570 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 571 const char *prefix) 572 { 573 IWL_DEBUG_RATE(mvm, 574 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 575 prefix, rs_pretty_rate(rate), rate->bw, 576 rate->sgi, rate->ldpc, rate->stbc); 577 } 578 579 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 580 { 581 window->data = 0; 582 window->success_counter = 0; 583 window->success_ratio = IWL_INVALID_VALUE; 584 window->counter = 0; 585 window->average_tpt = IWL_INVALID_VALUE; 586 } 587 588 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 589 struct iwl_scale_tbl_info *tbl) 590 { 591 int i; 592 593 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 594 for (i = 0; i < IWL_RATE_COUNT; i++) 595 rs_rate_scale_clear_window(&tbl->win[i]); 596 597 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 598 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 599 } 600 601 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 602 { 603 return (ant_type & valid_antenna) == ant_type; 604 } 605 606 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 607 struct iwl_lq_sta *lq_data, u8 tid, 608 struct ieee80211_sta *sta) 609 { 610 int ret = -EAGAIN; 611 612 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 613 sta->addr, tid); 614 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 615 if (ret == -EAGAIN) { 616 /* 617 * driver and mac80211 is out of sync 618 * this might be cause by reloading firmware 619 * stop the tx ba session here 620 */ 621 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 622 tid); 623 ieee80211_stop_tx_ba_session(sta, tid); 624 } 625 return ret; 626 } 627 628 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 629 struct iwl_lq_sta *lq_data, 630 struct ieee80211_sta *sta) 631 { 632 if (tid < IWL_MAX_TID_COUNT) 633 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 634 else 635 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 636 tid, IWL_MAX_TID_COUNT); 637 } 638 639 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 640 { 641 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 642 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 643 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 644 } 645 646 /* 647 * Static function to get the expected throughput from an iwl_scale_tbl_info 648 * that wraps a NULL pointer check 649 */ 650 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 651 { 652 if (tbl->expected_tpt) 653 return tbl->expected_tpt[rs_index]; 654 return 0; 655 } 656 657 /** 658 * rs_collect_tx_data - Update the success/failure sliding window 659 * 660 * We keep a sliding window of the last 62 packets transmitted 661 * at this rate. window->data contains the bitmask of successful 662 * packets. 663 */ 664 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 665 struct iwl_scale_tbl_info *tbl, 666 int scale_index, int attempts, int successes, 667 struct iwl_rate_scale_data *window) 668 { 669 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 670 s32 fail_count, tpt; 671 672 /* Get expected throughput */ 673 tpt = get_expected_tpt(tbl, scale_index); 674 675 /* 676 * Keep track of only the latest 62 tx frame attempts in this rate's 677 * history window; anything older isn't really relevant any more. 678 * If we have filled up the sliding window, drop the oldest attempt; 679 * if the oldest attempt (highest bit in bitmap) shows "success", 680 * subtract "1" from the success counter (this is the main reason 681 * we keep these bitmaps!). 682 */ 683 while (attempts > 0) { 684 if (window->counter >= IWL_RATE_MAX_WINDOW) { 685 /* remove earliest */ 686 window->counter = IWL_RATE_MAX_WINDOW - 1; 687 688 if (window->data & mask) { 689 window->data &= ~mask; 690 window->success_counter--; 691 } 692 } 693 694 /* Increment frames-attempted counter */ 695 window->counter++; 696 697 /* Shift bitmap by one frame to throw away oldest history */ 698 window->data <<= 1; 699 700 /* Mark the most recent #successes attempts as successful */ 701 if (successes > 0) { 702 window->success_counter++; 703 window->data |= 0x1; 704 successes--; 705 } 706 707 attempts--; 708 } 709 710 /* Calculate current success ratio, avoid divide-by-0! */ 711 if (window->counter > 0) 712 window->success_ratio = 128 * (100 * window->success_counter) 713 / window->counter; 714 else 715 window->success_ratio = IWL_INVALID_VALUE; 716 717 fail_count = window->counter - window->success_counter; 718 719 /* Calculate average throughput, if we have enough history. */ 720 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 721 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 722 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 723 else 724 window->average_tpt = IWL_INVALID_VALUE; 725 726 return 0; 727 } 728 729 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 730 struct iwl_lq_sta *lq_sta, 731 struct iwl_scale_tbl_info *tbl, 732 int scale_index, int attempts, int successes, 733 u8 reduced_txp) 734 { 735 struct iwl_rate_scale_data *window = NULL; 736 737 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 738 return -EINVAL; 739 740 window = &tbl->tpc_win[reduced_txp]; 741 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 742 window); 743 } 744 745 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 746 struct iwl_lq_sta *lq_sta, 747 struct iwl_scale_tbl_info *tbl, 748 int scale_index, int attempts, int successes) 749 { 750 struct iwl_rate_scale_data *window = NULL; 751 752 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 753 return -EINVAL; 754 755 if (tbl->column != RS_COLUMN_INVALID) { 756 struct lq_sta_pers *pers = &lq_sta->pers; 757 758 pers->tx_stats[tbl->column][scale_index].total += attempts; 759 pers->tx_stats[tbl->column][scale_index].success += successes; 760 } 761 762 /* Select window for current tx bit rate */ 763 window = &(tbl->win[scale_index]); 764 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 765 window); 766 } 767 768 /* Convert rs_rate object into ucode rate bitmask */ 769 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 770 struct rs_rate *rate) 771 { 772 u32 ucode_rate = 0; 773 int index = rate->index; 774 775 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 776 RATE_MCS_ANT_ABC_MSK); 777 778 if (is_legacy(rate)) { 779 ucode_rate |= iwl_rates[index].plcp; 780 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 781 ucode_rate |= RATE_MCS_CCK_MSK; 782 return ucode_rate; 783 } 784 785 if (is_ht(rate)) { 786 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 787 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 788 index = IWL_LAST_HT_RATE; 789 } 790 ucode_rate |= RATE_MCS_HT_MSK; 791 792 if (is_ht_siso(rate)) 793 ucode_rate |= iwl_rates[index].plcp_ht_siso; 794 else if (is_ht_mimo2(rate)) 795 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 796 else 797 WARN_ON_ONCE(1); 798 } else if (is_vht(rate)) { 799 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 800 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 801 index = IWL_LAST_VHT_RATE; 802 } 803 ucode_rate |= RATE_MCS_VHT_MSK; 804 if (is_vht_siso(rate)) 805 ucode_rate |= iwl_rates[index].plcp_vht_siso; 806 else if (is_vht_mimo2(rate)) 807 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 808 else 809 WARN_ON_ONCE(1); 810 811 } else { 812 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 813 } 814 815 if (is_siso(rate) && rate->stbc) { 816 /* To enable STBC we need to set both a flag and ANT_AB */ 817 ucode_rate |= RATE_MCS_ANT_AB_MSK; 818 ucode_rate |= RATE_MCS_VHT_STBC_MSK; 819 } 820 821 ucode_rate |= rate->bw; 822 if (rate->sgi) 823 ucode_rate |= RATE_MCS_SGI_MSK; 824 if (rate->ldpc) 825 ucode_rate |= RATE_MCS_LDPC_MSK; 826 827 return ucode_rate; 828 } 829 830 /* Convert a ucode rate into an rs_rate object */ 831 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 832 enum nl80211_band band, 833 struct rs_rate *rate) 834 { 835 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 836 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 837 u8 nss; 838 839 memset(rate, 0, sizeof(*rate)); 840 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 841 842 if (rate->index == IWL_RATE_INVALID) 843 return -EINVAL; 844 845 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 846 847 /* Legacy */ 848 if (!(ucode_rate & RATE_MCS_HT_MSK) && 849 !(ucode_rate & RATE_MCS_VHT_MSK)) { 850 if (num_of_ant == 1) { 851 if (band == NL80211_BAND_5GHZ) 852 rate->type = LQ_LEGACY_A; 853 else 854 rate->type = LQ_LEGACY_G; 855 } 856 857 return 0; 858 } 859 860 /* HT or VHT */ 861 if (ucode_rate & RATE_MCS_SGI_MSK) 862 rate->sgi = true; 863 if (ucode_rate & RATE_MCS_LDPC_MSK) 864 rate->ldpc = true; 865 if (ucode_rate & RATE_MCS_VHT_STBC_MSK) 866 rate->stbc = true; 867 if (ucode_rate & RATE_MCS_BF_MSK) 868 rate->bfer = true; 869 870 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 871 872 if (ucode_rate & RATE_MCS_HT_MSK) { 873 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 874 RATE_HT_MCS_NSS_POS) + 1; 875 876 if (nss == 1) { 877 rate->type = LQ_HT_SISO; 878 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 879 "stbc %d bfer %d", 880 rate->stbc, rate->bfer); 881 } else if (nss == 2) { 882 rate->type = LQ_HT_MIMO2; 883 WARN_ON_ONCE(num_of_ant != 2); 884 } else { 885 WARN_ON_ONCE(1); 886 } 887 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 888 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 889 RATE_VHT_MCS_NSS_POS) + 1; 890 891 if (nss == 1) { 892 rate->type = LQ_VHT_SISO; 893 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 894 "stbc %d bfer %d", 895 rate->stbc, rate->bfer); 896 } else if (nss == 2) { 897 rate->type = LQ_VHT_MIMO2; 898 WARN_ON_ONCE(num_of_ant != 2); 899 } else { 900 WARN_ON_ONCE(1); 901 } 902 } 903 904 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160); 905 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 906 !is_vht(rate)); 907 908 return 0; 909 } 910 911 /* switch to another antenna/antennas and return 1 */ 912 /* if no other valid antenna found, return 0 */ 913 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 914 { 915 u8 new_ant_type; 916 917 if (!rate->ant || rate->ant > ANT_ABC) 918 return 0; 919 920 if (!rs_is_valid_ant(valid_ant, rate->ant)) 921 return 0; 922 923 new_ant_type = ant_toggle_lookup[rate->ant]; 924 925 while ((new_ant_type != rate->ant) && 926 !rs_is_valid_ant(valid_ant, new_ant_type)) 927 new_ant_type = ant_toggle_lookup[new_ant_type]; 928 929 if (new_ant_type == rate->ant) 930 return 0; 931 932 rate->ant = new_ant_type; 933 934 return 1; 935 } 936 937 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 938 struct rs_rate *rate) 939 { 940 if (is_legacy(rate)) 941 return lq_sta->active_legacy_rate; 942 else if (is_siso(rate)) 943 return lq_sta->active_siso_rate; 944 else if (is_mimo2(rate)) 945 return lq_sta->active_mimo2_rate; 946 947 WARN_ON_ONCE(1); 948 return 0; 949 } 950 951 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 952 int rate_type) 953 { 954 u8 high = IWL_RATE_INVALID; 955 u8 low = IWL_RATE_INVALID; 956 957 /* 802.11A or ht walks to the next literal adjacent rate in 958 * the rate table */ 959 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 960 int i; 961 u32 mask; 962 963 /* Find the previous rate that is in the rate mask */ 964 i = index - 1; 965 for (mask = (1 << i); i >= 0; i--, mask >>= 1) { 966 if (rate_mask & mask) { 967 low = i; 968 break; 969 } 970 } 971 972 /* Find the next rate that is in the rate mask */ 973 i = index + 1; 974 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 975 if (rate_mask & mask) { 976 high = i; 977 break; 978 } 979 } 980 981 return (high << 8) | low; 982 } 983 984 low = index; 985 while (low != IWL_RATE_INVALID) { 986 low = iwl_rates[low].prev_rs; 987 if (low == IWL_RATE_INVALID) 988 break; 989 if (rate_mask & (1 << low)) 990 break; 991 } 992 993 high = index; 994 while (high != IWL_RATE_INVALID) { 995 high = iwl_rates[high].next_rs; 996 if (high == IWL_RATE_INVALID) 997 break; 998 if (rate_mask & (1 << high)) 999 break; 1000 } 1001 1002 return (high << 8) | low; 1003 } 1004 1005 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1006 struct rs_rate *rate) 1007 { 1008 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1009 } 1010 1011 /* Get the next supported lower rate in the current column. 1012 * Return true if bottom rate in the current column was reached 1013 */ 1014 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1015 struct rs_rate *rate) 1016 { 1017 u8 low; 1018 u16 high_low; 1019 u16 rate_mask; 1020 struct iwl_mvm *mvm = lq_sta->pers.drv; 1021 1022 rate_mask = rs_get_supported_rates(lq_sta, rate); 1023 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1024 rate->type); 1025 low = high_low & 0xff; 1026 1027 /* Bottom rate of column reached */ 1028 if (low == IWL_RATE_INVALID) 1029 return true; 1030 1031 rate->index = low; 1032 return false; 1033 } 1034 1035 /* Get the next rate to use following a column downgrade */ 1036 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1037 struct rs_rate *rate) 1038 { 1039 struct iwl_mvm *mvm = lq_sta->pers.drv; 1040 1041 if (is_legacy(rate)) { 1042 /* No column to downgrade from Legacy */ 1043 return; 1044 } else if (is_siso(rate)) { 1045 /* Downgrade to Legacy if we were in SISO */ 1046 if (lq_sta->band == NL80211_BAND_5GHZ) 1047 rate->type = LQ_LEGACY_A; 1048 else 1049 rate->type = LQ_LEGACY_G; 1050 1051 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1052 1053 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1054 rate->index > IWL_RATE_MCS_9_INDEX); 1055 1056 rate->index = rs_ht_to_legacy[rate->index]; 1057 rate->ldpc = false; 1058 } else { 1059 /* Downgrade to SISO with same MCS if in MIMO */ 1060 rate->type = is_vht_mimo2(rate) ? 1061 LQ_VHT_SISO : LQ_HT_SISO; 1062 } 1063 1064 if (num_of_ant(rate->ant) > 1) 1065 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1066 1067 /* Relevant in both switching to SISO or Legacy */ 1068 rate->sgi = false; 1069 1070 if (!rs_rate_supported(lq_sta, rate)) 1071 rs_get_lower_rate_in_column(lq_sta, rate); 1072 } 1073 1074 /* Check if both rates are identical 1075 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1076 * with a rate indicating STBC/BFER and ANT_AB. 1077 */ 1078 static inline bool rs_rate_equal(struct rs_rate *a, 1079 struct rs_rate *b, 1080 bool allow_ant_mismatch) 1081 1082 { 1083 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1084 (a->bfer == b->bfer); 1085 1086 if (allow_ant_mismatch) { 1087 if (a->stbc || a->bfer) { 1088 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1089 a->stbc, a->bfer, a->ant); 1090 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1091 } else if (b->stbc || b->bfer) { 1092 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1093 b->stbc, b->bfer, b->ant); 1094 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1095 } 1096 } 1097 1098 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1099 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1100 } 1101 1102 /* Check if both rates share the same column */ 1103 static inline bool rs_rate_column_match(struct rs_rate *a, 1104 struct rs_rate *b) 1105 { 1106 bool ant_match; 1107 1108 if (a->stbc || a->bfer) 1109 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1110 else 1111 ant_match = (a->ant == b->ant); 1112 1113 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1114 && ant_match; 1115 } 1116 1117 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1118 { 1119 if (is_legacy(rate)) { 1120 if (rate->ant == ANT_A) 1121 return RS_COLUMN_LEGACY_ANT_A; 1122 1123 if (rate->ant == ANT_B) 1124 return RS_COLUMN_LEGACY_ANT_B; 1125 1126 goto err; 1127 } 1128 1129 if (is_siso(rate)) { 1130 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1131 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1132 RS_COLUMN_SISO_ANT_A; 1133 1134 if (rate->ant == ANT_B) 1135 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1136 RS_COLUMN_SISO_ANT_B; 1137 1138 goto err; 1139 } 1140 1141 if (is_mimo(rate)) 1142 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1143 1144 err: 1145 return RS_COLUMN_INVALID; 1146 } 1147 1148 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1149 { 1150 u8 tid = IWL_MAX_TID_COUNT; 1151 1152 if (ieee80211_is_data_qos(hdr->frame_control)) { 1153 u8 *qc = ieee80211_get_qos_ctl(hdr); 1154 tid = qc[0] & 0xf; 1155 } 1156 1157 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1158 tid = IWL_MAX_TID_COUNT; 1159 1160 return tid; 1161 } 1162 1163 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1164 int tid, struct ieee80211_tx_info *info) 1165 { 1166 int legacy_success; 1167 int retries; 1168 int i; 1169 struct iwl_lq_cmd *table; 1170 u32 lq_hwrate; 1171 struct rs_rate lq_rate, tx_resp_rate; 1172 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1173 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1174 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1175 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1176 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1177 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1178 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1179 1180 /* Treat uninitialized rate scaling data same as non-existing. */ 1181 if (!lq_sta) { 1182 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1183 return; 1184 } else if (!lq_sta->pers.drv) { 1185 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1186 return; 1187 } 1188 1189 /* This packet was aggregated but doesn't carry status info */ 1190 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1191 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1192 return; 1193 1194 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1195 1196 #ifdef CONFIG_MAC80211_DEBUGFS 1197 /* Disable last tx check if we are debugging with fixed rate but 1198 * update tx stats */ 1199 if (lq_sta->pers.dbg_fixed_rate) { 1200 int index = tx_resp_rate.index; 1201 enum rs_column column; 1202 int attempts, success; 1203 1204 column = rs_get_column_from_rate(&tx_resp_rate); 1205 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1206 "Can't map rate 0x%x to column", 1207 tx_resp_hwrate)) 1208 return; 1209 1210 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1211 attempts = info->status.ampdu_len; 1212 success = info->status.ampdu_ack_len; 1213 } else { 1214 attempts = info->status.rates[0].count; 1215 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1216 } 1217 1218 lq_sta->pers.tx_stats[column][index].total += attempts; 1219 lq_sta->pers.tx_stats[column][index].success += success; 1220 1221 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1222 tx_resp_hwrate, success, attempts); 1223 return; 1224 } 1225 #endif 1226 1227 if (time_after(jiffies, 1228 (unsigned long)(lq_sta->last_tx + 1229 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1230 int t; 1231 1232 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1233 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1234 ieee80211_stop_tx_ba_session(sta, t); 1235 1236 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1237 return; 1238 } 1239 lq_sta->last_tx = jiffies; 1240 1241 /* Ignore this Tx frame response if its initial rate doesn't match 1242 * that of latest Link Quality command. There may be stragglers 1243 * from a previous Link Quality command, but we're no longer interested 1244 * in those; they're either from the "active" mode while we're trying 1245 * to check "search" mode, or a prior "search" mode after we've moved 1246 * to a new "search" mode (which might become the new "active" mode). 1247 */ 1248 table = &lq_sta->lq; 1249 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1250 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1251 1252 /* Here we actually compare this rate to the latest LQ command */ 1253 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1254 IWL_DEBUG_RATE(mvm, 1255 "initial tx resp rate 0x%x does not match 0x%x\n", 1256 tx_resp_hwrate, lq_hwrate); 1257 1258 /* 1259 * Since rates mis-match, the last LQ command may have failed. 1260 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1261 * ... driver. 1262 */ 1263 lq_sta->missed_rate_counter++; 1264 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1265 lq_sta->missed_rate_counter = 0; 1266 IWL_DEBUG_RATE(mvm, 1267 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1268 lq_sta->rs_state); 1269 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1270 } 1271 /* Regardless, ignore this status info for outdated rate */ 1272 return; 1273 } else 1274 /* Rate did match, so reset the missed_rate_counter */ 1275 lq_sta->missed_rate_counter = 0; 1276 1277 if (!lq_sta->search_better_tbl) { 1278 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1279 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1280 } else { 1281 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1282 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1283 } 1284 1285 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1286 IWL_DEBUG_RATE(mvm, 1287 "Neither active nor search matches tx rate\n"); 1288 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1289 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1290 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1291 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1292 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1293 1294 /* 1295 * no matching table found, let's by-pass the data collection 1296 * and continue to perform rate scale to find the rate table 1297 */ 1298 rs_stay_in_table(lq_sta, true); 1299 goto done; 1300 } 1301 1302 /* 1303 * Updating the frame history depends on whether packets were 1304 * aggregated. 1305 * 1306 * For aggregation, all packets were transmitted at the same rate, the 1307 * first index into rate scale table. 1308 */ 1309 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1310 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1311 info->status.ampdu_len, 1312 info->status.ampdu_ack_len, 1313 reduced_txp); 1314 1315 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1316 * it as a single frame loss as we don't want the success ratio 1317 * to dip too quickly because a BA wasn't received. 1318 * For TPC, there's no need for this optimisation since we want 1319 * to recover very quickly from a bad power reduction and, 1320 * therefore we'd like the success ratio to get an immediate hit 1321 * when failing to get a BA, so we'd switch back to a lower or 1322 * zero power reduction. When FW transmits agg with a rate 1323 * different from the initial rate, it will not use reduced txp 1324 * and will send BA notification twice (one empty with reduced 1325 * txp equal to the value from LQ and one with reduced txp 0). 1326 * We need to update counters for each txp level accordingly. 1327 */ 1328 if (info->status.ampdu_ack_len == 0) 1329 info->status.ampdu_len = 1; 1330 1331 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1332 info->status.ampdu_len, 1333 info->status.ampdu_ack_len); 1334 1335 /* Update success/fail counts if not searching for new mode */ 1336 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1337 lq_sta->total_success += info->status.ampdu_ack_len; 1338 lq_sta->total_failed += (info->status.ampdu_len - 1339 info->status.ampdu_ack_len); 1340 } 1341 } else { 1342 /* For legacy, update frame history with for each Tx retry. */ 1343 retries = info->status.rates[0].count - 1; 1344 /* HW doesn't send more than 15 retries */ 1345 retries = min(retries, 15); 1346 1347 /* The last transmission may have been successful */ 1348 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1349 /* Collect data for each rate used during failed TX attempts */ 1350 for (i = 0; i <= retries; ++i) { 1351 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1352 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1353 &lq_rate); 1354 /* 1355 * Only collect stats if retried rate is in the same RS 1356 * table as active/search. 1357 */ 1358 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1359 tmp_tbl = curr_tbl; 1360 else if (rs_rate_column_match(&lq_rate, 1361 &other_tbl->rate)) 1362 tmp_tbl = other_tbl; 1363 else 1364 continue; 1365 1366 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1367 lq_rate.index, 1, 1368 i < retries ? 0 : legacy_success, 1369 reduced_txp); 1370 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1371 lq_rate.index, 1, 1372 i < retries ? 0 : legacy_success); 1373 } 1374 1375 /* Update success/fail counts if not searching for new mode */ 1376 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1377 lq_sta->total_success += legacy_success; 1378 lq_sta->total_failed += retries + (1 - legacy_success); 1379 } 1380 } 1381 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1382 lq_sta->last_rate_n_flags = lq_hwrate; 1383 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1384 done: 1385 /* See if there's a better rate or modulation mode to try. */ 1386 if (sta->supp_rates[info->band]) 1387 rs_rate_scale_perform(mvm, sta, lq_sta, tid); 1388 } 1389 1390 /* 1391 * mac80211 sends us Tx status 1392 */ 1393 static void rs_mac80211_tx_status(void *mvm_r, 1394 struct ieee80211_supported_band *sband, 1395 struct ieee80211_sta *sta, void *priv_sta, 1396 struct sk_buff *skb) 1397 { 1398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1399 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1400 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1402 1403 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1404 return; 1405 1406 if (!ieee80211_is_data(hdr->frame_control) || 1407 info->flags & IEEE80211_TX_CTL_NO_ACK) 1408 return; 1409 1410 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info); 1411 } 1412 1413 /* 1414 * Begin a period of staying with a selected modulation mode. 1415 * Set "stay_in_tbl" flag to prevent any mode switches. 1416 * Set frame tx success limits according to legacy vs. high-throughput, 1417 * and reset overall (spanning all rates) tx success history statistics. 1418 * These control how long we stay using same modulation mode before 1419 * searching for a new mode. 1420 */ 1421 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1422 struct iwl_lq_sta *lq_sta) 1423 { 1424 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1425 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1426 if (is_legacy) { 1427 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1428 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1429 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1430 } else { 1431 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1432 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1433 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1434 } 1435 lq_sta->table_count = 0; 1436 lq_sta->total_failed = 0; 1437 lq_sta->total_success = 0; 1438 lq_sta->flush_timer = jiffies; 1439 lq_sta->visited_columns = 0; 1440 } 1441 1442 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1443 { 1444 if (rate_mask) 1445 return find_last_bit(&rate_mask, BITS_PER_LONG); 1446 return IWL_RATE_INVALID; 1447 } 1448 1449 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1450 const struct rs_tx_column *column) 1451 { 1452 switch (column->mode) { 1453 case RS_LEGACY: 1454 return lq_sta->max_legacy_rate_idx; 1455 case RS_SISO: 1456 return lq_sta->max_siso_rate_idx; 1457 case RS_MIMO2: 1458 return lq_sta->max_mimo2_rate_idx; 1459 default: 1460 WARN_ON_ONCE(1); 1461 } 1462 1463 return lq_sta->max_legacy_rate_idx; 1464 } 1465 1466 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1467 const struct rs_tx_column *column, 1468 u32 bw) 1469 { 1470 /* Used to choose among HT tables */ 1471 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1472 1473 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1474 column->mode != RS_SISO && 1475 column->mode != RS_MIMO2)) 1476 return expected_tpt_legacy; 1477 1478 /* Legacy rates have only one table */ 1479 if (column->mode == RS_LEGACY) 1480 return expected_tpt_legacy; 1481 1482 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1483 /* Choose among many HT tables depending on number of streams 1484 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1485 * status */ 1486 if (column->mode == RS_SISO) { 1487 switch (bw) { 1488 case RATE_MCS_CHAN_WIDTH_20: 1489 ht_tbl_pointer = expected_tpt_siso_20MHz; 1490 break; 1491 case RATE_MCS_CHAN_WIDTH_40: 1492 ht_tbl_pointer = expected_tpt_siso_40MHz; 1493 break; 1494 case RATE_MCS_CHAN_WIDTH_80: 1495 ht_tbl_pointer = expected_tpt_siso_80MHz; 1496 break; 1497 default: 1498 WARN_ON_ONCE(1); 1499 } 1500 } else if (column->mode == RS_MIMO2) { 1501 switch (bw) { 1502 case RATE_MCS_CHAN_WIDTH_20: 1503 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1504 break; 1505 case RATE_MCS_CHAN_WIDTH_40: 1506 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1507 break; 1508 case RATE_MCS_CHAN_WIDTH_80: 1509 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1510 break; 1511 default: 1512 WARN_ON_ONCE(1); 1513 } 1514 } else { 1515 WARN_ON_ONCE(1); 1516 } 1517 1518 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1519 return ht_tbl_pointer[0]; 1520 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1521 return ht_tbl_pointer[1]; 1522 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1523 return ht_tbl_pointer[2]; 1524 else /* AGG+SGI */ 1525 return ht_tbl_pointer[3]; 1526 } 1527 1528 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1529 struct iwl_scale_tbl_info *tbl) 1530 { 1531 struct rs_rate *rate = &tbl->rate; 1532 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1533 1534 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1535 } 1536 1537 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1538 struct iwl_lq_sta *lq_sta, 1539 struct iwl_scale_tbl_info *tbl, /* "search" */ 1540 unsigned long rate_mask, s8 index) 1541 { 1542 struct iwl_scale_tbl_info *active_tbl = 1543 &(lq_sta->lq_info[lq_sta->active_tbl]); 1544 s32 success_ratio = active_tbl->win[index].success_ratio; 1545 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1546 const u16 *tpt_tbl = tbl->expected_tpt; 1547 u16 high_low; 1548 u32 target_tpt; 1549 int rate_idx; 1550 1551 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1552 target_tpt = 100 * expected_current_tpt; 1553 IWL_DEBUG_RATE(mvm, 1554 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1555 success_ratio, target_tpt); 1556 } else { 1557 target_tpt = lq_sta->last_tpt; 1558 IWL_DEBUG_RATE(mvm, 1559 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1560 success_ratio, target_tpt); 1561 } 1562 1563 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1564 1565 while (rate_idx != IWL_RATE_INVALID) { 1566 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1567 break; 1568 1569 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1570 tbl->rate.type); 1571 1572 rate_idx = (high_low >> 8) & 0xff; 1573 } 1574 1575 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1576 rate_idx, target_tpt, 1577 rate_idx != IWL_RATE_INVALID ? 1578 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1579 1580 return rate_idx; 1581 } 1582 1583 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1584 { 1585 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 1586 return RATE_MCS_CHAN_WIDTH_80; 1587 else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) 1588 return RATE_MCS_CHAN_WIDTH_40; 1589 1590 return RATE_MCS_CHAN_WIDTH_20; 1591 } 1592 1593 /* 1594 * Check whether we should continue using same modulation mode, or 1595 * begin search for a new mode, based on: 1596 * 1) # tx successes or failures while using this mode 1597 * 2) # times calling this function 1598 * 3) elapsed time in this mode (not used, for now) 1599 */ 1600 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1601 { 1602 struct iwl_scale_tbl_info *tbl; 1603 int active_tbl; 1604 int flush_interval_passed = 0; 1605 struct iwl_mvm *mvm; 1606 1607 mvm = lq_sta->pers.drv; 1608 active_tbl = lq_sta->active_tbl; 1609 1610 tbl = &(lq_sta->lq_info[active_tbl]); 1611 1612 /* If we've been disallowing search, see if we should now allow it */ 1613 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1614 /* Elapsed time using current modulation mode */ 1615 if (lq_sta->flush_timer) 1616 flush_interval_passed = 1617 time_after(jiffies, 1618 (unsigned long)(lq_sta->flush_timer + 1619 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1620 1621 /* 1622 * Check if we should allow search for new modulation mode. 1623 * If many frames have failed or succeeded, or we've used 1624 * this same modulation for a long time, allow search, and 1625 * reset history stats that keep track of whether we should 1626 * allow a new search. Also (below) reset all bitmaps and 1627 * stats in active history. 1628 */ 1629 if (force_search || 1630 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1631 (lq_sta->total_success > lq_sta->max_success_limit) || 1632 ((!lq_sta->search_better_tbl) && 1633 (lq_sta->flush_timer) && (flush_interval_passed))) { 1634 IWL_DEBUG_RATE(mvm, 1635 "LQ: stay is expired %d %d %d\n", 1636 lq_sta->total_failed, 1637 lq_sta->total_success, 1638 flush_interval_passed); 1639 1640 /* Allow search for new mode */ 1641 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1642 IWL_DEBUG_RATE(mvm, 1643 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1644 lq_sta->total_failed = 0; 1645 lq_sta->total_success = 0; 1646 lq_sta->flush_timer = 0; 1647 /* mark the current column as visited */ 1648 lq_sta->visited_columns = BIT(tbl->column); 1649 /* 1650 * Else if we've used this modulation mode enough repetitions 1651 * (regardless of elapsed time or success/failure), reset 1652 * history bitmaps and rate-specific stats for all rates in 1653 * active table. 1654 */ 1655 } else { 1656 lq_sta->table_count++; 1657 if (lq_sta->table_count >= 1658 lq_sta->table_count_limit) { 1659 lq_sta->table_count = 0; 1660 1661 IWL_DEBUG_RATE(mvm, 1662 "LQ: stay in table clear win\n"); 1663 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1664 } 1665 } 1666 1667 /* If transitioning to allow "search", reset all history 1668 * bitmaps and stats in active table (this will become the new 1669 * "search" table). */ 1670 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1671 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1672 } 1673 } 1674 } 1675 1676 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1677 struct iwl_scale_tbl_info *tbl, 1678 enum rs_action scale_action) 1679 { 1680 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 1681 1682 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1683 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1684 scale_action == RS_ACTION_DOWNSCALE) 1685 sta_priv->tlc_amsdu = false; 1686 else 1687 sta_priv->tlc_amsdu = true; 1688 } 1689 1690 /* 1691 * setup rate table in uCode 1692 */ 1693 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1694 struct ieee80211_sta *sta, 1695 struct iwl_lq_sta *lq_sta, 1696 struct iwl_scale_tbl_info *tbl) 1697 { 1698 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1699 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1700 } 1701 1702 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1703 struct ieee80211_sta *sta, 1704 struct iwl_lq_sta *lq_sta, 1705 struct iwl_scale_tbl_info *tbl, 1706 enum rs_action scale_action) 1707 { 1708 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1709 return false; 1710 1711 if (!is_vht_siso(&tbl->rate)) 1712 return false; 1713 1714 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1715 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1716 (scale_action == RS_ACTION_DOWNSCALE)) { 1717 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1718 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1719 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1720 goto tweaked; 1721 } 1722 1723 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1724 * sustainable, i.e. we're past the test window. We can't go back 1725 * if MCS5 is just tested as this will happen always after switching 1726 * to 20Mhz MCS4 because the rate stats are cleared. 1727 */ 1728 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1729 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1730 (scale_action == RS_ACTION_STAY)) || 1731 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1732 (scale_action == RS_ACTION_UPSCALE)))) { 1733 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1734 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1735 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1736 goto tweaked; 1737 } 1738 1739 return false; 1740 1741 tweaked: 1742 rs_set_expected_tpt_table(lq_sta, tbl); 1743 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1744 return true; 1745 } 1746 1747 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1748 struct iwl_lq_sta *lq_sta, 1749 struct ieee80211_sta *sta, 1750 struct iwl_scale_tbl_info *tbl) 1751 { 1752 int i, j, max_rate; 1753 enum rs_column next_col_id; 1754 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1755 const struct rs_tx_column *next_col; 1756 allow_column_func_t allow_func; 1757 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1758 const u16 *expected_tpt_tbl; 1759 u16 tpt, max_expected_tpt; 1760 1761 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1762 next_col_id = curr_col->next_columns[i]; 1763 1764 if (next_col_id == RS_COLUMN_INVALID) 1765 continue; 1766 1767 if (lq_sta->visited_columns & BIT(next_col_id)) { 1768 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1769 next_col_id); 1770 continue; 1771 } 1772 1773 next_col = &rs_tx_columns[next_col_id]; 1774 1775 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1776 IWL_DEBUG_RATE(mvm, 1777 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1778 next_col_id, valid_ants, next_col->ant); 1779 continue; 1780 } 1781 1782 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1783 allow_func = next_col->checks[j]; 1784 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1785 next_col)) 1786 break; 1787 } 1788 1789 if (j != MAX_COLUMN_CHECKS) { 1790 IWL_DEBUG_RATE(mvm, 1791 "Skip column %d: not allowed (check %d failed)\n", 1792 next_col_id, j); 1793 1794 continue; 1795 } 1796 1797 tpt = lq_sta->last_tpt / 100; 1798 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1799 rs_bw_from_sta_bw(sta)); 1800 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1801 continue; 1802 1803 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1804 if (max_rate == IWL_RATE_INVALID) { 1805 IWL_DEBUG_RATE(mvm, 1806 "Skip column %d: no rate is allowed in this column\n", 1807 next_col_id); 1808 continue; 1809 } 1810 1811 max_expected_tpt = expected_tpt_tbl[max_rate]; 1812 if (tpt >= max_expected_tpt) { 1813 IWL_DEBUG_RATE(mvm, 1814 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1815 next_col_id, max_expected_tpt, tpt); 1816 continue; 1817 } 1818 1819 IWL_DEBUG_RATE(mvm, 1820 "Found potential column %d. Max expected %d current %d\n", 1821 next_col_id, max_expected_tpt, tpt); 1822 break; 1823 } 1824 1825 if (i == MAX_NEXT_COLUMNS) 1826 return RS_COLUMN_INVALID; 1827 1828 return next_col_id; 1829 } 1830 1831 static int rs_switch_to_column(struct iwl_mvm *mvm, 1832 struct iwl_lq_sta *lq_sta, 1833 struct ieee80211_sta *sta, 1834 enum rs_column col_id) 1835 { 1836 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1837 struct iwl_scale_tbl_info *search_tbl = 1838 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1839 struct rs_rate *rate = &search_tbl->rate; 1840 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1841 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1842 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1843 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1844 unsigned long rate_mask = 0; 1845 u32 rate_idx = 0; 1846 1847 memcpy(search_tbl, tbl, sz); 1848 1849 rate->sgi = column->sgi; 1850 rate->ant = column->ant; 1851 1852 if (column->mode == RS_LEGACY) { 1853 if (lq_sta->band == NL80211_BAND_5GHZ) 1854 rate->type = LQ_LEGACY_A; 1855 else 1856 rate->type = LQ_LEGACY_G; 1857 1858 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1859 rate->ldpc = false; 1860 rate_mask = lq_sta->active_legacy_rate; 1861 } else if (column->mode == RS_SISO) { 1862 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1863 rate_mask = lq_sta->active_siso_rate; 1864 } else if (column->mode == RS_MIMO2) { 1865 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1866 rate_mask = lq_sta->active_mimo2_rate; 1867 } else { 1868 WARN_ONCE(1, "Bad column mode"); 1869 } 1870 1871 if (column->mode != RS_LEGACY) { 1872 rate->bw = rs_bw_from_sta_bw(sta); 1873 rate->ldpc = lq_sta->ldpc; 1874 } 1875 1876 search_tbl->column = col_id; 1877 rs_set_expected_tpt_table(lq_sta, search_tbl); 1878 1879 lq_sta->visited_columns |= BIT(col_id); 1880 1881 /* Get the best matching rate if we're changing modes. e.g. 1882 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1883 */ 1884 if (curr_column->mode != column->mode) { 1885 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1886 rate_mask, rate->index); 1887 1888 if ((rate_idx == IWL_RATE_INVALID) || 1889 !(BIT(rate_idx) & rate_mask)) { 1890 IWL_DEBUG_RATE(mvm, 1891 "can not switch with index %d" 1892 " rate mask %lx\n", 1893 rate_idx, rate_mask); 1894 1895 goto err; 1896 } 1897 1898 rate->index = rate_idx; 1899 } 1900 1901 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1902 col_id, rate->index); 1903 1904 return 0; 1905 1906 err: 1907 rate->type = LQ_NONE; 1908 return -1; 1909 } 1910 1911 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1912 struct iwl_scale_tbl_info *tbl, 1913 s32 sr, int low, int high, 1914 int current_tpt, 1915 int low_tpt, int high_tpt) 1916 { 1917 enum rs_action action = RS_ACTION_STAY; 1918 1919 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1920 (current_tpt == 0)) { 1921 IWL_DEBUG_RATE(mvm, 1922 "Decrease rate because of low SR\n"); 1923 return RS_ACTION_DOWNSCALE; 1924 } 1925 1926 if ((low_tpt == IWL_INVALID_VALUE) && 1927 (high_tpt == IWL_INVALID_VALUE) && 1928 (high != IWL_RATE_INVALID)) { 1929 IWL_DEBUG_RATE(mvm, 1930 "No data about high/low rates. Increase rate\n"); 1931 return RS_ACTION_UPSCALE; 1932 } 1933 1934 if ((high_tpt == IWL_INVALID_VALUE) && 1935 (high != IWL_RATE_INVALID) && 1936 (low_tpt != IWL_INVALID_VALUE) && 1937 (low_tpt < current_tpt)) { 1938 IWL_DEBUG_RATE(mvm, 1939 "No data about high rate and low rate is worse. Increase rate\n"); 1940 return RS_ACTION_UPSCALE; 1941 } 1942 1943 if ((high_tpt != IWL_INVALID_VALUE) && 1944 (high_tpt > current_tpt)) { 1945 IWL_DEBUG_RATE(mvm, 1946 "Higher rate is better. Increate rate\n"); 1947 return RS_ACTION_UPSCALE; 1948 } 1949 1950 if ((low_tpt != IWL_INVALID_VALUE) && 1951 (high_tpt != IWL_INVALID_VALUE) && 1952 (low_tpt < current_tpt) && 1953 (high_tpt < current_tpt)) { 1954 IWL_DEBUG_RATE(mvm, 1955 "Both high and low are worse. Maintain rate\n"); 1956 return RS_ACTION_STAY; 1957 } 1958 1959 if ((low_tpt != IWL_INVALID_VALUE) && 1960 (low_tpt > current_tpt)) { 1961 IWL_DEBUG_RATE(mvm, 1962 "Lower rate is better\n"); 1963 action = RS_ACTION_DOWNSCALE; 1964 goto out; 1965 } 1966 1967 if ((low_tpt == IWL_INVALID_VALUE) && 1968 (low != IWL_RATE_INVALID)) { 1969 IWL_DEBUG_RATE(mvm, 1970 "No data about lower rate\n"); 1971 action = RS_ACTION_DOWNSCALE; 1972 goto out; 1973 } 1974 1975 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1976 1977 out: 1978 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1979 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1980 IWL_DEBUG_RATE(mvm, 1981 "SR is above NO DECREASE. Avoid downscale\n"); 1982 action = RS_ACTION_STAY; 1983 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1984 IWL_DEBUG_RATE(mvm, 1985 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1986 action = RS_ACTION_STAY; 1987 } else { 1988 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1989 } 1990 } 1991 1992 return action; 1993 } 1994 1995 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1996 struct iwl_lq_sta *lq_sta) 1997 { 1998 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1999 * supports STBC of at least 1*SS 2000 */ 2001 if (!lq_sta->stbc_capable) 2002 return false; 2003 2004 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2005 return false; 2006 2007 return true; 2008 } 2009 2010 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2011 int *weaker, int *stronger) 2012 { 2013 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2014 if (*weaker > TPC_MAX_REDUCTION) 2015 *weaker = TPC_INVALID; 2016 2017 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2018 if (*stronger < 0) 2019 *stronger = TPC_INVALID; 2020 } 2021 2022 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2023 struct rs_rate *rate, enum nl80211_band band) 2024 { 2025 int index = rate->index; 2026 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2027 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2028 !vif->bss_conf.ps); 2029 2030 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2031 cam, sta_ps_disabled); 2032 /* 2033 * allow tpc only if power management is enabled, or bt coex 2034 * activity grade allows it and we are on 2.4Ghz. 2035 */ 2036 if ((cam || sta_ps_disabled) && 2037 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2038 return false; 2039 2040 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2041 if (is_legacy(rate)) 2042 return index == IWL_RATE_54M_INDEX; 2043 if (is_ht(rate)) 2044 return index == IWL_RATE_MCS_7_INDEX; 2045 if (is_vht(rate)) 2046 return index == IWL_RATE_MCS_7_INDEX || 2047 index == IWL_RATE_MCS_8_INDEX || 2048 index == IWL_RATE_MCS_9_INDEX; 2049 2050 WARN_ON_ONCE(1); 2051 return false; 2052 } 2053 2054 enum tpc_action { 2055 TPC_ACTION_STAY, 2056 TPC_ACTION_DECREASE, 2057 TPC_ACTION_INCREASE, 2058 TPC_ACTION_NO_RESTIRCTION, 2059 }; 2060 2061 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2062 s32 sr, int weak, int strong, 2063 int current_tpt, 2064 int weak_tpt, int strong_tpt) 2065 { 2066 /* stay until we have valid tpt */ 2067 if (current_tpt == IWL_INVALID_VALUE) { 2068 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2069 return TPC_ACTION_STAY; 2070 } 2071 2072 /* Too many failures, increase txp */ 2073 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2074 current_tpt == 0) { 2075 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2076 return TPC_ACTION_NO_RESTIRCTION; 2077 } 2078 2079 /* try decreasing first if applicable */ 2080 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2081 weak != TPC_INVALID) { 2082 if (weak_tpt == IWL_INVALID_VALUE && 2083 (strong_tpt == IWL_INVALID_VALUE || 2084 current_tpt >= strong_tpt)) { 2085 IWL_DEBUG_RATE(mvm, 2086 "no weak txp measurement. decrease txp\n"); 2087 return TPC_ACTION_DECREASE; 2088 } 2089 2090 if (weak_tpt > current_tpt) { 2091 IWL_DEBUG_RATE(mvm, 2092 "lower txp has better tpt. decrease txp\n"); 2093 return TPC_ACTION_DECREASE; 2094 } 2095 } 2096 2097 /* next, increase if needed */ 2098 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2099 strong != TPC_INVALID) { 2100 if (weak_tpt == IWL_INVALID_VALUE && 2101 strong_tpt != IWL_INVALID_VALUE && 2102 current_tpt < strong_tpt) { 2103 IWL_DEBUG_RATE(mvm, 2104 "higher txp has better tpt. increase txp\n"); 2105 return TPC_ACTION_INCREASE; 2106 } 2107 2108 if (weak_tpt < current_tpt && 2109 (strong_tpt == IWL_INVALID_VALUE || 2110 strong_tpt > current_tpt)) { 2111 IWL_DEBUG_RATE(mvm, 2112 "lower txp has worse tpt. increase txp\n"); 2113 return TPC_ACTION_INCREASE; 2114 } 2115 } 2116 2117 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2118 return TPC_ACTION_STAY; 2119 } 2120 2121 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2122 struct ieee80211_sta *sta, 2123 struct iwl_lq_sta *lq_sta, 2124 struct iwl_scale_tbl_info *tbl) 2125 { 2126 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2127 struct ieee80211_vif *vif = mvm_sta->vif; 2128 struct ieee80211_chanctx_conf *chanctx_conf; 2129 enum nl80211_band band; 2130 struct iwl_rate_scale_data *window; 2131 struct rs_rate *rate = &tbl->rate; 2132 enum tpc_action action; 2133 s32 sr; 2134 u8 cur = lq_sta->lq.reduced_tpc; 2135 int current_tpt; 2136 int weak, strong; 2137 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2138 2139 #ifdef CONFIG_MAC80211_DEBUGFS 2140 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2141 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2142 lq_sta->pers.dbg_fixed_txp_reduction); 2143 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2144 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2145 } 2146 #endif 2147 2148 rcu_read_lock(); 2149 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2150 if (WARN_ON(!chanctx_conf)) 2151 band = NUM_NL80211_BANDS; 2152 else 2153 band = chanctx_conf->def.chan->band; 2154 rcu_read_unlock(); 2155 2156 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2157 IWL_DEBUG_RATE(mvm, 2158 "tpc is not allowed. remove txp restrictions\n"); 2159 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2160 return cur != TPC_NO_REDUCTION; 2161 } 2162 2163 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2164 2165 /* Collect measured throughputs for current and adjacent rates */ 2166 window = tbl->tpc_win; 2167 sr = window[cur].success_ratio; 2168 current_tpt = window[cur].average_tpt; 2169 if (weak != TPC_INVALID) 2170 weak_tpt = window[weak].average_tpt; 2171 if (strong != TPC_INVALID) 2172 strong_tpt = window[strong].average_tpt; 2173 2174 IWL_DEBUG_RATE(mvm, 2175 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2176 cur, current_tpt, sr, weak, strong, 2177 weak_tpt, strong_tpt); 2178 2179 action = rs_get_tpc_action(mvm, sr, weak, strong, 2180 current_tpt, weak_tpt, strong_tpt); 2181 2182 /* override actions if we are on the edge */ 2183 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2184 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2185 action = TPC_ACTION_STAY; 2186 } else if (strong == TPC_INVALID && 2187 (action == TPC_ACTION_INCREASE || 2188 action == TPC_ACTION_NO_RESTIRCTION)) { 2189 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2190 action = TPC_ACTION_STAY; 2191 } 2192 2193 switch (action) { 2194 case TPC_ACTION_DECREASE: 2195 lq_sta->lq.reduced_tpc = weak; 2196 return true; 2197 case TPC_ACTION_INCREASE: 2198 lq_sta->lq.reduced_tpc = strong; 2199 return true; 2200 case TPC_ACTION_NO_RESTIRCTION: 2201 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2202 return true; 2203 case TPC_ACTION_STAY: 2204 /* do nothing */ 2205 break; 2206 } 2207 return false; 2208 } 2209 2210 /* 2211 * Do rate scaling and search for new modulation mode. 2212 */ 2213 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2214 struct ieee80211_sta *sta, 2215 struct iwl_lq_sta *lq_sta, 2216 int tid) 2217 { 2218 int low = IWL_RATE_INVALID; 2219 int high = IWL_RATE_INVALID; 2220 int index; 2221 struct iwl_rate_scale_data *window = NULL; 2222 int current_tpt = IWL_INVALID_VALUE; 2223 int low_tpt = IWL_INVALID_VALUE; 2224 int high_tpt = IWL_INVALID_VALUE; 2225 u32 fail_count; 2226 enum rs_action scale_action = RS_ACTION_STAY; 2227 u16 rate_mask; 2228 u8 update_lq = 0; 2229 struct iwl_scale_tbl_info *tbl, *tbl1; 2230 u8 active_tbl = 0; 2231 u8 done_search = 0; 2232 u16 high_low; 2233 s32 sr; 2234 u8 prev_agg = lq_sta->is_agg; 2235 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2236 struct iwl_mvm_tid_data *tid_data; 2237 struct rs_rate *rate; 2238 2239 lq_sta->is_agg = !!sta_priv->agg_tids; 2240 2241 /* 2242 * Select rate-scale / modulation-mode table to work with in 2243 * the rest of this function: "search" if searching for better 2244 * modulation mode, or "active" if doing rate scaling within a mode. 2245 */ 2246 if (!lq_sta->search_better_tbl) 2247 active_tbl = lq_sta->active_tbl; 2248 else 2249 active_tbl = 1 - lq_sta->active_tbl; 2250 2251 tbl = &(lq_sta->lq_info[active_tbl]); 2252 rate = &tbl->rate; 2253 2254 if (prev_agg != lq_sta->is_agg) { 2255 IWL_DEBUG_RATE(mvm, 2256 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2257 prev_agg, lq_sta->is_agg); 2258 rs_set_expected_tpt_table(lq_sta, tbl); 2259 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2260 } 2261 2262 /* current tx rate */ 2263 index = rate->index; 2264 2265 /* rates available for this association, and for modulation mode */ 2266 rate_mask = rs_get_supported_rates(lq_sta, rate); 2267 2268 if (!(BIT(index) & rate_mask)) { 2269 IWL_ERR(mvm, "Current Rate is not valid\n"); 2270 if (lq_sta->search_better_tbl) { 2271 /* revert to active table if search table is not valid*/ 2272 rate->type = LQ_NONE; 2273 lq_sta->search_better_tbl = 0; 2274 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2275 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2276 } 2277 return; 2278 } 2279 2280 /* Get expected throughput table and history window for current rate */ 2281 if (!tbl->expected_tpt) { 2282 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2283 return; 2284 } 2285 2286 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2287 window = &(tbl->win[index]); 2288 2289 /* 2290 * If there is not enough history to calculate actual average 2291 * throughput, keep analyzing results of more tx frames, without 2292 * changing rate or mode (bypass most of the rest of this function). 2293 * Set up new rate table in uCode only if old rate is not supported 2294 * in current association (use new rate found above). 2295 */ 2296 fail_count = window->counter - window->success_counter; 2297 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2298 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2299 IWL_DEBUG_RATE(mvm, 2300 "%s: Test Window: succ %d total %d\n", 2301 rs_pretty_rate(rate), 2302 window->success_counter, window->counter); 2303 2304 /* Can't calculate this yet; not enough history */ 2305 window->average_tpt = IWL_INVALID_VALUE; 2306 2307 /* Should we stay with this modulation mode, 2308 * or search for a new one? */ 2309 rs_stay_in_table(lq_sta, false); 2310 2311 return; 2312 } 2313 2314 /* If we are searching for better modulation mode, check success. */ 2315 if (lq_sta->search_better_tbl) { 2316 /* If good success, continue using the "search" mode; 2317 * no need to send new link quality command, since we're 2318 * continuing to use the setup that we've been trying. */ 2319 if (window->average_tpt > lq_sta->last_tpt) { 2320 IWL_DEBUG_RATE(mvm, 2321 "SWITCHING TO NEW TABLE SR: %d " 2322 "cur-tpt %d old-tpt %d\n", 2323 window->success_ratio, 2324 window->average_tpt, 2325 lq_sta->last_tpt); 2326 2327 /* Swap tables; "search" becomes "active" */ 2328 lq_sta->active_tbl = active_tbl; 2329 current_tpt = window->average_tpt; 2330 /* Else poor success; go back to mode in "active" table */ 2331 } else { 2332 IWL_DEBUG_RATE(mvm, 2333 "GOING BACK TO THE OLD TABLE: SR %d " 2334 "cur-tpt %d old-tpt %d\n", 2335 window->success_ratio, 2336 window->average_tpt, 2337 lq_sta->last_tpt); 2338 2339 /* Nullify "search" table */ 2340 rate->type = LQ_NONE; 2341 2342 /* Revert to "active" table */ 2343 active_tbl = lq_sta->active_tbl; 2344 tbl = &(lq_sta->lq_info[active_tbl]); 2345 2346 /* Revert to "active" rate and throughput info */ 2347 index = tbl->rate.index; 2348 current_tpt = lq_sta->last_tpt; 2349 2350 /* Need to set up a new rate table in uCode */ 2351 update_lq = 1; 2352 } 2353 2354 /* Either way, we've made a decision; modulation mode 2355 * search is done, allow rate adjustment next time. */ 2356 lq_sta->search_better_tbl = 0; 2357 done_search = 1; /* Don't switch modes below! */ 2358 goto lq_update; 2359 } 2360 2361 /* (Else) not in search of better modulation mode, try for better 2362 * starting rate, while staying in this mode. */ 2363 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2364 low = high_low & 0xff; 2365 high = (high_low >> 8) & 0xff; 2366 2367 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2368 2369 sr = window->success_ratio; 2370 2371 /* Collect measured throughputs for current and adjacent rates */ 2372 current_tpt = window->average_tpt; 2373 if (low != IWL_RATE_INVALID) 2374 low_tpt = tbl->win[low].average_tpt; 2375 if (high != IWL_RATE_INVALID) 2376 high_tpt = tbl->win[high].average_tpt; 2377 2378 IWL_DEBUG_RATE(mvm, 2379 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2380 rs_pretty_rate(rate), current_tpt, sr, 2381 low, high, low_tpt, high_tpt); 2382 2383 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2384 current_tpt, low_tpt, high_tpt); 2385 2386 /* Force a search in case BT doesn't like us being in MIMO */ 2387 if (is_mimo(rate) && 2388 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2389 IWL_DEBUG_RATE(mvm, 2390 "BT Coex forbids MIMO. Search for new config\n"); 2391 rs_stay_in_table(lq_sta, true); 2392 goto lq_update; 2393 } 2394 2395 switch (scale_action) { 2396 case RS_ACTION_DOWNSCALE: 2397 /* Decrease starting rate, update uCode's rate table */ 2398 if (low != IWL_RATE_INVALID) { 2399 update_lq = 1; 2400 index = low; 2401 } else { 2402 IWL_DEBUG_RATE(mvm, 2403 "At the bottom rate. Can't decrease\n"); 2404 } 2405 2406 break; 2407 case RS_ACTION_UPSCALE: 2408 /* Increase starting rate, update uCode's rate table */ 2409 if (high != IWL_RATE_INVALID) { 2410 update_lq = 1; 2411 index = high; 2412 } else { 2413 IWL_DEBUG_RATE(mvm, 2414 "At the top rate. Can't increase\n"); 2415 } 2416 2417 break; 2418 case RS_ACTION_STAY: 2419 /* No change */ 2420 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2421 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2422 break; 2423 default: 2424 break; 2425 } 2426 2427 lq_update: 2428 /* Replace uCode's rate table for the destination station. */ 2429 if (update_lq) { 2430 tbl->rate.index = index; 2431 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2432 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2433 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2434 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2435 } 2436 2437 rs_stay_in_table(lq_sta, false); 2438 2439 /* 2440 * Search for new modulation mode if we're: 2441 * 1) Not changing rates right now 2442 * 2) Not just finishing up a search 2443 * 3) Allowing a new search 2444 */ 2445 if (!update_lq && !done_search && 2446 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2447 && window->counter) { 2448 enum rs_column next_column; 2449 2450 /* Save current throughput to compare with "search" throughput*/ 2451 lq_sta->last_tpt = current_tpt; 2452 2453 IWL_DEBUG_RATE(mvm, 2454 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2455 update_lq, done_search, lq_sta->rs_state, 2456 window->counter); 2457 2458 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2459 if (next_column != RS_COLUMN_INVALID) { 2460 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2461 next_column); 2462 if (!ret) 2463 lq_sta->search_better_tbl = 1; 2464 } else { 2465 IWL_DEBUG_RATE(mvm, 2466 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2467 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2468 } 2469 2470 /* If new "search" mode was selected, set up in uCode table */ 2471 if (lq_sta->search_better_tbl) { 2472 /* Access the "search" table, clear its history. */ 2473 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2474 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2475 2476 /* Use new "search" start rate */ 2477 index = tbl->rate.index; 2478 2479 rs_dump_rate(mvm, &tbl->rate, 2480 "Switch to SEARCH TABLE:"); 2481 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2482 } else { 2483 done_search = 1; 2484 } 2485 } 2486 2487 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2488 /* If the "active" (non-search) mode was legacy, 2489 * and we've tried switching antennas, 2490 * but we haven't been able to try HT modes (not available), 2491 * stay with best antenna legacy modulation for a while 2492 * before next round of mode comparisons. */ 2493 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2494 if (is_legacy(&tbl1->rate)) { 2495 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2496 2497 if (tid != IWL_MAX_TID_COUNT) { 2498 tid_data = &sta_priv->tid_data[tid]; 2499 if (tid_data->state != IWL_AGG_OFF) { 2500 IWL_DEBUG_RATE(mvm, 2501 "Stop aggregation on tid %d\n", 2502 tid); 2503 ieee80211_stop_tx_ba_session(sta, tid); 2504 } 2505 } 2506 rs_set_stay_in_table(mvm, 1, lq_sta); 2507 } else { 2508 /* If we're in an HT mode, and all 3 mode switch actions 2509 * have been tried and compared, stay in this best modulation 2510 * mode for a while before next round of mode comparisons. */ 2511 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2512 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2513 (tid != IWL_MAX_TID_COUNT)) { 2514 tid_data = &sta_priv->tid_data[tid]; 2515 if (tid_data->state == IWL_AGG_OFF) { 2516 IWL_DEBUG_RATE(mvm, 2517 "try to aggregate tid %d\n", 2518 tid); 2519 rs_tl_turn_on_agg(mvm, tid, 2520 lq_sta, sta); 2521 } 2522 } 2523 rs_set_stay_in_table(mvm, 0, lq_sta); 2524 } 2525 } 2526 } 2527 2528 struct rs_init_rate_info { 2529 s8 rssi; 2530 u8 rate_idx; 2531 }; 2532 2533 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2534 { -60, IWL_RATE_54M_INDEX }, 2535 { -64, IWL_RATE_48M_INDEX }, 2536 { -68, IWL_RATE_36M_INDEX }, 2537 { -80, IWL_RATE_24M_INDEX }, 2538 { -84, IWL_RATE_18M_INDEX }, 2539 { -85, IWL_RATE_12M_INDEX }, 2540 { -86, IWL_RATE_11M_INDEX }, 2541 { -88, IWL_RATE_5M_INDEX }, 2542 { -90, IWL_RATE_2M_INDEX }, 2543 { S8_MIN, IWL_RATE_1M_INDEX }, 2544 }; 2545 2546 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2547 { -60, IWL_RATE_54M_INDEX }, 2548 { -64, IWL_RATE_48M_INDEX }, 2549 { -72, IWL_RATE_36M_INDEX }, 2550 { -80, IWL_RATE_24M_INDEX }, 2551 { -84, IWL_RATE_18M_INDEX }, 2552 { -85, IWL_RATE_12M_INDEX }, 2553 { -87, IWL_RATE_9M_INDEX }, 2554 { S8_MIN, IWL_RATE_6M_INDEX }, 2555 }; 2556 2557 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2558 { -60, IWL_RATE_MCS_7_INDEX }, 2559 { -64, IWL_RATE_MCS_6_INDEX }, 2560 { -68, IWL_RATE_MCS_5_INDEX }, 2561 { -72, IWL_RATE_MCS_4_INDEX }, 2562 { -80, IWL_RATE_MCS_3_INDEX }, 2563 { -84, IWL_RATE_MCS_2_INDEX }, 2564 { -85, IWL_RATE_MCS_1_INDEX }, 2565 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2566 }; 2567 2568 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2569 { -60, IWL_RATE_MCS_8_INDEX }, 2570 { -64, IWL_RATE_MCS_7_INDEX }, 2571 { -68, IWL_RATE_MCS_6_INDEX }, 2572 { -72, IWL_RATE_MCS_5_INDEX }, 2573 { -80, IWL_RATE_MCS_4_INDEX }, 2574 { -84, IWL_RATE_MCS_3_INDEX }, 2575 { -85, IWL_RATE_MCS_2_INDEX }, 2576 { -87, IWL_RATE_MCS_1_INDEX }, 2577 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2578 }; 2579 2580 static const struct rs_init_rate_info rs_optimal_rates_vht_40_80mhz[] = { 2581 { -60, IWL_RATE_MCS_9_INDEX }, 2582 { -64, IWL_RATE_MCS_8_INDEX }, 2583 { -68, IWL_RATE_MCS_7_INDEX }, 2584 { -72, IWL_RATE_MCS_6_INDEX }, 2585 { -80, IWL_RATE_MCS_5_INDEX }, 2586 { -84, IWL_RATE_MCS_4_INDEX }, 2587 { -85, IWL_RATE_MCS_3_INDEX }, 2588 { -87, IWL_RATE_MCS_2_INDEX }, 2589 { -88, IWL_RATE_MCS_1_INDEX }, 2590 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2591 }; 2592 2593 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2594 2595 /* Init the optimal rate based on STA caps 2596 * This combined with rssi is used to report the last tx rate 2597 * to userspace when we haven't transmitted enough frames. 2598 */ 2599 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2600 struct ieee80211_sta *sta, 2601 struct iwl_lq_sta *lq_sta) 2602 { 2603 struct rs_rate *rate = &lq_sta->optimal_rate; 2604 2605 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2606 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2607 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2608 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2609 else if (lq_sta->band == NL80211_BAND_5GHZ) 2610 rate->type = LQ_LEGACY_A; 2611 else 2612 rate->type = LQ_LEGACY_G; 2613 2614 rate->bw = rs_bw_from_sta_bw(sta); 2615 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2616 2617 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2618 2619 if (is_mimo(rate)) { 2620 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2621 } else if (is_siso(rate)) { 2622 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2623 } else { 2624 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2625 2626 if (lq_sta->band == NL80211_BAND_5GHZ) { 2627 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2628 lq_sta->optimal_nentries = 2629 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2630 } else { 2631 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2632 lq_sta->optimal_nentries = 2633 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2634 } 2635 } 2636 2637 if (is_vht(rate)) { 2638 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2639 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2640 lq_sta->optimal_nentries = 2641 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2642 } else { 2643 lq_sta->optimal_rates = rs_optimal_rates_vht_40_80mhz; 2644 lq_sta->optimal_nentries = 2645 ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2646 } 2647 } else if (is_ht(rate)) { 2648 lq_sta->optimal_rates = rs_optimal_rates_ht; 2649 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2650 } 2651 } 2652 2653 /* Compute the optimal rate index based on RSSI */ 2654 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2655 struct iwl_lq_sta *lq_sta) 2656 { 2657 struct rs_rate *rate = &lq_sta->optimal_rate; 2658 int i; 2659 2660 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2661 BITS_PER_LONG); 2662 2663 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2664 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2665 2666 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2667 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2668 rate->index = rate_idx; 2669 break; 2670 } 2671 } 2672 2673 return rate; 2674 } 2675 2676 /* Choose an initial legacy rate and antenna to use based on the RSSI 2677 * of last Rx 2678 */ 2679 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2680 struct ieee80211_sta *sta, 2681 struct iwl_lq_sta *lq_sta, 2682 enum nl80211_band band, 2683 struct rs_rate *rate) 2684 { 2685 int i, nentries; 2686 unsigned long active_rate; 2687 s8 best_rssi = S8_MIN; 2688 u8 best_ant = ANT_NONE; 2689 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2690 const struct rs_init_rate_info *initial_rates; 2691 2692 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2693 if (!(lq_sta->pers.chains & BIT(i))) 2694 continue; 2695 2696 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2697 best_rssi = lq_sta->pers.chain_signal[i]; 2698 best_ant = BIT(i); 2699 } 2700 } 2701 2702 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2703 rs_pretty_ant(best_ant), best_rssi); 2704 2705 if (best_ant != ANT_A && best_ant != ANT_B) 2706 rate->ant = first_antenna(valid_tx_ant); 2707 else 2708 rate->ant = best_ant; 2709 2710 rate->sgi = false; 2711 rate->ldpc = false; 2712 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2713 2714 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2715 BITS_PER_LONG); 2716 2717 if (band == NL80211_BAND_5GHZ) { 2718 rate->type = LQ_LEGACY_A; 2719 initial_rates = rs_optimal_rates_5ghz_legacy; 2720 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2721 } else { 2722 rate->type = LQ_LEGACY_G; 2723 initial_rates = rs_optimal_rates_24ghz_legacy; 2724 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2725 } 2726 2727 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2728 goto out; 2729 2730 /* Start from a higher rate if the corresponding debug capability 2731 * is enabled. The rate is chosen according to AP capabilities. 2732 * In case of VHT/HT when the rssi is low fallback to the case of 2733 * legacy rates. 2734 */ 2735 if (sta->vht_cap.vht_supported && 2736 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2737 if (sta->bandwidth >= IEEE80211_STA_RX_BW_40) { 2738 initial_rates = rs_optimal_rates_vht_40_80mhz; 2739 nentries = ARRAY_SIZE(rs_optimal_rates_vht_40_80mhz); 2740 if (sta->bandwidth >= IEEE80211_STA_RX_BW_80) 2741 rate->bw = RATE_MCS_CHAN_WIDTH_80; 2742 else 2743 rate->bw = RATE_MCS_CHAN_WIDTH_40; 2744 } else if (sta->bandwidth == IEEE80211_STA_RX_BW_20) { 2745 initial_rates = rs_optimal_rates_vht_20mhz; 2746 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2747 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2748 } else { 2749 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2750 goto out; 2751 } 2752 active_rate = lq_sta->active_siso_rate; 2753 rate->type = LQ_VHT_SISO; 2754 } else if (sta->ht_cap.ht_supported && 2755 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2756 initial_rates = rs_optimal_rates_ht; 2757 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2758 active_rate = lq_sta->active_siso_rate; 2759 rate->type = LQ_HT_SISO; 2760 } else { 2761 active_rate = lq_sta->active_legacy_rate; 2762 } 2763 2764 for (i = 0; i < nentries; i++) { 2765 int rate_idx = initial_rates[i].rate_idx; 2766 2767 if ((best_rssi >= initial_rates[i].rssi) && 2768 (BIT(rate_idx) & active_rate)) { 2769 rate->index = rate_idx; 2770 break; 2771 } 2772 } 2773 2774 out: 2775 rs_dump_rate(mvm, rate, "INITIAL"); 2776 } 2777 2778 /* Save info about RSSI of last Rx */ 2779 void rs_update_last_rssi(struct iwl_mvm *mvm, 2780 struct iwl_lq_sta *lq_sta, 2781 struct ieee80211_rx_status *rx_status) 2782 { 2783 int i; 2784 2785 lq_sta->pers.chains = rx_status->chains; 2786 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2787 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2788 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2789 lq_sta->pers.last_rssi = S8_MIN; 2790 2791 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2792 if (!(lq_sta->pers.chains & BIT(i))) 2793 continue; 2794 2795 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2796 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2797 } 2798 } 2799 2800 /** 2801 * rs_initialize_lq - Initialize a station's hardware rate table 2802 * 2803 * The uCode's station table contains a table of fallback rates 2804 * for automatic fallback during transmission. 2805 * 2806 * NOTE: This sets up a default set of values. These will be replaced later 2807 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2808 * rc80211_simple. 2809 * 2810 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2811 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2812 * which requires station table entry to exist). 2813 */ 2814 static void rs_initialize_lq(struct iwl_mvm *mvm, 2815 struct ieee80211_sta *sta, 2816 struct iwl_lq_sta *lq_sta, 2817 enum nl80211_band band, 2818 bool init) 2819 { 2820 struct iwl_scale_tbl_info *tbl; 2821 struct rs_rate *rate; 2822 u8 active_tbl = 0; 2823 2824 if (!sta || !lq_sta) 2825 return; 2826 2827 if (!lq_sta->search_better_tbl) 2828 active_tbl = lq_sta->active_tbl; 2829 else 2830 active_tbl = 1 - lq_sta->active_tbl; 2831 2832 tbl = &(lq_sta->lq_info[active_tbl]); 2833 rate = &tbl->rate; 2834 2835 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2836 rs_init_optimal_rate(mvm, sta, lq_sta); 2837 2838 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2839 tbl->column = rs_get_column_from_rate(rate); 2840 2841 rs_set_expected_tpt_table(lq_sta, tbl); 2842 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2843 /* TODO restore station should remember the lq cmd */ 2844 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2845 } 2846 2847 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2848 struct ieee80211_tx_rate_control *txrc) 2849 { 2850 struct sk_buff *skb = txrc->skb; 2851 struct iwl_op_mode *op_mode __maybe_unused = 2852 (struct iwl_op_mode *)mvm_r; 2853 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2855 struct iwl_lq_sta *lq_sta = mvm_sta; 2856 struct rs_rate *optimal_rate; 2857 u32 last_ucode_rate; 2858 2859 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2860 /* if vif isn't initialized mvm doesn't know about 2861 * this station, so don't do anything with the it 2862 */ 2863 sta = NULL; 2864 mvm_sta = NULL; 2865 } 2866 2867 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2868 2869 /* Treat uninitialized rate scaling data same as non-existing. */ 2870 if (lq_sta && !lq_sta->pers.drv) { 2871 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2872 mvm_sta = NULL; 2873 } 2874 2875 /* Send management frames and NO_ACK data using lowest rate. */ 2876 if (rate_control_send_low(sta, mvm_sta, txrc)) 2877 return; 2878 2879 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2880 info->band, &info->control.rates[0]); 2881 info->control.rates[0].count = 1; 2882 2883 /* Report the optimal rate based on rssi and STA caps if we haven't 2884 * converged yet (too little traffic) or exploring other modulations 2885 */ 2886 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2887 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2888 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2889 optimal_rate); 2890 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2891 &txrc->reported_rate); 2892 } 2893 } 2894 2895 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2896 gfp_t gfp) 2897 { 2898 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2899 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2900 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2901 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2902 2903 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2904 2905 lq_sta->pers.drv = mvm; 2906 #ifdef CONFIG_MAC80211_DEBUGFS 2907 lq_sta->pers.dbg_fixed_rate = 0; 2908 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2909 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2910 #endif 2911 lq_sta->pers.chains = 0; 2912 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2913 lq_sta->pers.last_rssi = S8_MIN; 2914 2915 return &sta_priv->lq_sta; 2916 } 2917 2918 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2919 int nss) 2920 { 2921 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2922 (0x3 << (2 * (nss - 1))); 2923 rx_mcs >>= (2 * (nss - 1)); 2924 2925 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2926 return IWL_RATE_MCS_7_INDEX; 2927 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2928 return IWL_RATE_MCS_8_INDEX; 2929 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2930 return IWL_RATE_MCS_9_INDEX; 2931 2932 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2933 return -1; 2934 } 2935 2936 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2937 struct ieee80211_sta_vht_cap *vht_cap, 2938 struct iwl_lq_sta *lq_sta) 2939 { 2940 int i; 2941 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2942 2943 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2944 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2945 if (i == IWL_RATE_9M_INDEX) 2946 continue; 2947 2948 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2949 if (i == IWL_RATE_MCS_9_INDEX && 2950 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2951 continue; 2952 2953 lq_sta->active_siso_rate |= BIT(i); 2954 } 2955 } 2956 2957 if (sta->rx_nss < 2) 2958 return; 2959 2960 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2961 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2962 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2963 if (i == IWL_RATE_9M_INDEX) 2964 continue; 2965 2966 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2967 if (i == IWL_RATE_MCS_9_INDEX && 2968 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2969 continue; 2970 2971 lq_sta->active_mimo2_rate |= BIT(i); 2972 } 2973 } 2974 } 2975 2976 static void rs_ht_init(struct iwl_mvm *mvm, 2977 struct ieee80211_sta *sta, 2978 struct iwl_lq_sta *lq_sta, 2979 struct ieee80211_sta_ht_cap *ht_cap) 2980 { 2981 /* active_siso_rate mask includes 9 MBits (bit 5), 2982 * and CCK (bits 0-3), supp_rates[] does not; 2983 * shift to convert format, force 9 MBits off. 2984 */ 2985 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2986 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2987 lq_sta->active_siso_rate &= ~((u16)0x2); 2988 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2989 2990 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2991 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2992 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2993 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2994 2995 if (mvm->cfg->ht_params->ldpc && 2996 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2997 lq_sta->ldpc = true; 2998 2999 if (mvm->cfg->ht_params->stbc && 3000 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3001 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3002 lq_sta->stbc_capable = true; 3003 3004 lq_sta->is_vht = false; 3005 } 3006 3007 static void rs_vht_init(struct iwl_mvm *mvm, 3008 struct ieee80211_sta *sta, 3009 struct iwl_lq_sta *lq_sta, 3010 struct ieee80211_sta_vht_cap *vht_cap) 3011 { 3012 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3013 3014 if (mvm->cfg->ht_params->ldpc && 3015 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3016 lq_sta->ldpc = true; 3017 3018 if (mvm->cfg->ht_params->stbc && 3019 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3020 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3021 lq_sta->stbc_capable = true; 3022 3023 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3024 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3025 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3026 lq_sta->bfer_capable = true; 3027 3028 lq_sta->is_vht = true; 3029 } 3030 3031 #ifdef CONFIG_IWLWIFI_DEBUGFS 3032 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3033 { 3034 spin_lock_bh(&mvm->drv_stats_lock); 3035 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3036 spin_unlock_bh(&mvm->drv_stats_lock); 3037 } 3038 3039 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3040 { 3041 u8 nss = 0, mcs = 0; 3042 3043 spin_lock(&mvm->drv_stats_lock); 3044 3045 if (agg) 3046 mvm->drv_rx_stats.agg_frames++; 3047 3048 mvm->drv_rx_stats.success_frames++; 3049 3050 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3051 case RATE_MCS_CHAN_WIDTH_20: 3052 mvm->drv_rx_stats.bw_20_frames++; 3053 break; 3054 case RATE_MCS_CHAN_WIDTH_40: 3055 mvm->drv_rx_stats.bw_40_frames++; 3056 break; 3057 case RATE_MCS_CHAN_WIDTH_80: 3058 mvm->drv_rx_stats.bw_80_frames++; 3059 break; 3060 default: 3061 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3062 } 3063 3064 if (rate & RATE_MCS_HT_MSK) { 3065 mvm->drv_rx_stats.ht_frames++; 3066 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK; 3067 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3068 } else if (rate & RATE_MCS_VHT_MSK) { 3069 mvm->drv_rx_stats.vht_frames++; 3070 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3071 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3072 RATE_VHT_MCS_NSS_POS) + 1; 3073 } else { 3074 mvm->drv_rx_stats.legacy_frames++; 3075 } 3076 3077 if (nss == 1) 3078 mvm->drv_rx_stats.siso_frames++; 3079 else if (nss == 2) 3080 mvm->drv_rx_stats.mimo2_frames++; 3081 3082 if (rate & RATE_MCS_SGI_MSK) 3083 mvm->drv_rx_stats.sgi_frames++; 3084 else 3085 mvm->drv_rx_stats.ngi_frames++; 3086 3087 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3088 mvm->drv_rx_stats.last_frame_idx = 3089 (mvm->drv_rx_stats.last_frame_idx + 1) % 3090 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3091 3092 spin_unlock(&mvm->drv_stats_lock); 3093 } 3094 #endif 3095 3096 /* 3097 * Called after adding a new station to initialize rate scaling 3098 */ 3099 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3100 enum nl80211_band band, bool init) 3101 { 3102 int i, j; 3103 struct ieee80211_hw *hw = mvm->hw; 3104 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3105 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3106 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3107 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3108 struct ieee80211_supported_band *sband; 3109 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3110 3111 /* clear all non-persistent lq data */ 3112 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3113 3114 sband = hw->wiphy->bands[band]; 3115 3116 lq_sta->lq.sta_id = sta_priv->sta_id; 3117 sta_priv->tlc_amsdu = false; 3118 3119 for (j = 0; j < LQ_SIZE; j++) 3120 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3121 3122 lq_sta->flush_timer = 0; 3123 lq_sta->last_tx = jiffies; 3124 3125 IWL_DEBUG_RATE(mvm, 3126 "LQ: *** rate scale station global init for station %d ***\n", 3127 sta_priv->sta_id); 3128 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3129 * the lowest or the highest rate.. Could consider using RSSI from 3130 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3131 * after assoc.. */ 3132 3133 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3134 lq_sta->band = sband->band; 3135 /* 3136 * active legacy rates as per supported rates bitmap 3137 */ 3138 supp = sta->supp_rates[sband->band]; 3139 lq_sta->active_legacy_rate = 0; 3140 for_each_set_bit(i, &supp, BITS_PER_LONG) 3141 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3142 3143 /* TODO: should probably account for rx_highest for both HT/VHT */ 3144 if (!vht_cap || !vht_cap->vht_supported) 3145 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3146 else 3147 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3148 3149 lq_sta->max_legacy_rate_idx = 3150 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3151 lq_sta->max_siso_rate_idx = 3152 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3153 lq_sta->max_mimo2_rate_idx = 3154 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3155 3156 IWL_DEBUG_RATE(mvm, 3157 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3158 lq_sta->active_legacy_rate, 3159 lq_sta->active_siso_rate, 3160 lq_sta->active_mimo2_rate, 3161 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3162 lq_sta->bfer_capable); 3163 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3164 lq_sta->max_legacy_rate_idx, 3165 lq_sta->max_siso_rate_idx, 3166 lq_sta->max_mimo2_rate_idx); 3167 3168 /* These values will be overridden later */ 3169 lq_sta->lq.single_stream_ant_msk = 3170 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3171 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3172 3173 /* as default allow aggregation for all tids */ 3174 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3175 lq_sta->is_agg = 0; 3176 #ifdef CONFIG_IWLWIFI_DEBUGFS 3177 iwl_mvm_reset_frame_stats(mvm); 3178 #endif 3179 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3180 } 3181 3182 static void rs_rate_update(void *mvm_r, 3183 struct ieee80211_supported_band *sband, 3184 struct cfg80211_chan_def *chandef, 3185 struct ieee80211_sta *sta, void *priv_sta, 3186 u32 changed) 3187 { 3188 u8 tid; 3189 struct iwl_op_mode *op_mode = 3190 (struct iwl_op_mode *)mvm_r; 3191 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3192 3193 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3194 return; 3195 3196 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3197 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3198 ieee80211_stop_tx_ba_session(sta, tid); 3199 3200 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3201 } 3202 3203 #ifdef CONFIG_MAC80211_DEBUGFS 3204 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3205 struct iwl_lq_cmd *lq_cmd, 3206 enum nl80211_band band, 3207 u32 ucode_rate) 3208 { 3209 struct rs_rate rate; 3210 int i; 3211 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3212 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3213 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3214 3215 for (i = 0; i < num_rates; i++) 3216 lq_cmd->rs_table[i] = ucode_rate_le32; 3217 3218 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3219 3220 if (is_mimo(&rate)) 3221 lq_cmd->mimo_delim = num_rates - 1; 3222 else 3223 lq_cmd->mimo_delim = 0; 3224 3225 lq_cmd->reduced_tpc = 0; 3226 3227 if (num_of_ant(ant) == 1) 3228 lq_cmd->single_stream_ant_msk = ant; 3229 3230 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3231 } 3232 #endif /* CONFIG_MAC80211_DEBUGFS */ 3233 3234 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3235 struct iwl_lq_sta *lq_sta, 3236 struct rs_rate *rate, 3237 __le32 *rs_table, int *rs_table_index, 3238 int num_rates, int num_retries, 3239 u8 valid_tx_ant, bool toggle_ant) 3240 { 3241 int i, j; 3242 __le32 ucode_rate; 3243 bool bottom_reached = false; 3244 int prev_rate_idx = rate->index; 3245 int end = LINK_QUAL_MAX_RETRY_NUM; 3246 int index = *rs_table_index; 3247 3248 for (i = 0; i < num_rates && index < end; i++) { 3249 for (j = 0; j < num_retries && index < end; j++, index++) { 3250 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3251 rate)); 3252 rs_table[index] = ucode_rate; 3253 if (toggle_ant) 3254 rs_toggle_antenna(valid_tx_ant, rate); 3255 } 3256 3257 prev_rate_idx = rate->index; 3258 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3259 if (bottom_reached && !is_legacy(rate)) 3260 break; 3261 } 3262 3263 if (!bottom_reached && !is_legacy(rate)) 3264 rate->index = prev_rate_idx; 3265 3266 *rs_table_index = index; 3267 } 3268 3269 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3270 * column the rate table should look like this: 3271 * 3272 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3273 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3274 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3275 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3276 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3277 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3278 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3279 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3280 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3281 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3282 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3283 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3284 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3285 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3286 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3287 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3288 */ 3289 static void rs_build_rates_table(struct iwl_mvm *mvm, 3290 struct ieee80211_sta *sta, 3291 struct iwl_lq_sta *lq_sta, 3292 const struct rs_rate *initial_rate) 3293 { 3294 struct rs_rate rate; 3295 int num_rates, num_retries, index = 0; 3296 u8 valid_tx_ant = 0; 3297 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3298 bool toggle_ant = false; 3299 3300 memcpy(&rate, initial_rate, sizeof(rate)); 3301 3302 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3303 3304 /* TODO: remove old API when min FW API hits 14 */ 3305 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3306 rs_stbc_allow(mvm, sta, lq_sta)) 3307 rate.stbc = true; 3308 3309 if (is_siso(&rate)) { 3310 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3311 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3312 } else if (is_mimo(&rate)) { 3313 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3314 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3315 } else { 3316 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3317 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3318 toggle_ant = true; 3319 } 3320 3321 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3322 num_rates, num_retries, valid_tx_ant, 3323 toggle_ant); 3324 3325 rs_get_lower_rate_down_column(lq_sta, &rate); 3326 3327 if (is_siso(&rate)) { 3328 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3329 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3330 lq_cmd->mimo_delim = index; 3331 } else if (is_legacy(&rate)) { 3332 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3333 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3334 } else { 3335 WARN_ON_ONCE(1); 3336 } 3337 3338 toggle_ant = true; 3339 3340 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3341 num_rates, num_retries, valid_tx_ant, 3342 toggle_ant); 3343 3344 rs_get_lower_rate_down_column(lq_sta, &rate); 3345 3346 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3347 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3348 3349 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3350 num_rates, num_retries, valid_tx_ant, 3351 toggle_ant); 3352 3353 } 3354 3355 struct rs_bfer_active_iter_data { 3356 struct ieee80211_sta *exclude_sta; 3357 struct iwl_mvm_sta *bfer_mvmsta; 3358 }; 3359 3360 static void rs_bfer_active_iter(void *_data, 3361 struct ieee80211_sta *sta) 3362 { 3363 struct rs_bfer_active_iter_data *data = _data; 3364 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3365 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3366 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3367 3368 if (sta == data->exclude_sta) 3369 return; 3370 3371 /* The current sta has BFER allowed */ 3372 if (ss_params & LQ_SS_BFER_ALLOWED) { 3373 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3374 3375 data->bfer_mvmsta = mvmsta; 3376 } 3377 } 3378 3379 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3380 { 3381 int prio = -1; 3382 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3383 3384 switch (viftype) { 3385 case NL80211_IFTYPE_AP: 3386 case NL80211_IFTYPE_P2P_GO: 3387 prio = 3; 3388 break; 3389 case NL80211_IFTYPE_P2P_CLIENT: 3390 prio = 2; 3391 break; 3392 case NL80211_IFTYPE_STATION: 3393 prio = 1; 3394 break; 3395 default: 3396 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3397 prio = -1; 3398 } 3399 3400 return prio; 3401 } 3402 3403 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3404 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3405 struct iwl_mvm_sta *sta2) 3406 { 3407 int prio1 = rs_bfer_priority(sta1); 3408 int prio2 = rs_bfer_priority(sta2); 3409 3410 if (prio1 > prio2) 3411 return 1; 3412 if (prio1 < prio2) 3413 return -1; 3414 return 0; 3415 } 3416 3417 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3418 struct ieee80211_sta *sta, 3419 struct iwl_lq_sta *lq_sta, 3420 const struct rs_rate *initial_rate) 3421 { 3422 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3423 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3424 struct rs_bfer_active_iter_data data = { 3425 .exclude_sta = sta, 3426 .bfer_mvmsta = NULL, 3427 }; 3428 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3429 u32 ss_params = LQ_SS_PARAMS_VALID; 3430 3431 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3432 goto out; 3433 3434 #ifdef CONFIG_MAC80211_DEBUGFS 3435 /* Check if forcing the decision is configured. 3436 * Note that SISO is forced by not allowing STBC or BFER 3437 */ 3438 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3439 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3440 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3441 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3442 3443 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3444 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3445 lq_sta->pers.ss_force); 3446 goto out; 3447 } 3448 #endif 3449 3450 if (lq_sta->stbc_capable) 3451 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3452 3453 if (!lq_sta->bfer_capable) 3454 goto out; 3455 3456 ieee80211_iterate_stations_atomic(mvm->hw, 3457 rs_bfer_active_iter, 3458 &data); 3459 bfer_mvmsta = data.bfer_mvmsta; 3460 3461 /* This code is safe as it doesn't run concurrently for different 3462 * stations. This is guaranteed by the fact that calls to 3463 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3464 */ 3465 if (!bfer_mvmsta) { 3466 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3467 3468 ss_params |= LQ_SS_BFER_ALLOWED; 3469 goto out; 3470 } 3471 3472 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3473 bfer_mvmsta->sta_id); 3474 3475 /* Disallow BFER on another STA if active and we're a higher priority */ 3476 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3477 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3478 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3479 3480 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3481 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3482 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3483 3484 ss_params |= LQ_SS_BFER_ALLOWED; 3485 IWL_DEBUG_RATE(mvm, 3486 "Lower priority BFER sta found (%d). Switch BFER\n", 3487 bfer_mvmsta->sta_id); 3488 } 3489 out: 3490 lq_cmd->ss_params = cpu_to_le32(ss_params); 3491 } 3492 3493 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3494 struct ieee80211_sta *sta, 3495 struct iwl_lq_sta *lq_sta, 3496 const struct rs_rate *initial_rate) 3497 { 3498 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3499 struct iwl_mvm_sta *mvmsta; 3500 struct iwl_mvm_vif *mvmvif; 3501 3502 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3503 lq_cmd->agg_time_limit = 3504 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3505 3506 #ifdef CONFIG_MAC80211_DEBUGFS 3507 if (lq_sta->pers.dbg_fixed_rate) { 3508 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3509 lq_sta->band, 3510 lq_sta->pers.dbg_fixed_rate); 3511 return; 3512 } 3513 #endif 3514 if (WARN_ON_ONCE(!sta || !initial_rate)) 3515 return; 3516 3517 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3518 3519 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3520 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3521 3522 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3523 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3524 3525 if (num_of_ant(initial_rate->ant) == 1) 3526 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3527 3528 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3529 3530 /* 3531 * In case of low latency, tell the firmware to leave a frame in the 3532 * Tx Fifo so that it can start a transaction in the same TxOP. This 3533 * basically allows the firmware to send bursts. 3534 */ 3535 if (iwl_mvm_vif_low_latency(mvmvif)) 3536 lq_cmd->agg_frame_cnt_limit--; 3537 3538 if (mvmsta->vif->p2p) 3539 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3540 3541 lq_cmd->agg_time_limit = 3542 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3543 } 3544 3545 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3546 { 3547 return hw->priv; 3548 } 3549 /* rate scale requires free function to be implemented */ 3550 static void rs_free(void *mvm_rate) 3551 { 3552 return; 3553 } 3554 3555 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3556 void *mvm_sta) 3557 { 3558 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3559 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3560 3561 IWL_DEBUG_RATE(mvm, "enter\n"); 3562 IWL_DEBUG_RATE(mvm, "leave\n"); 3563 } 3564 3565 #ifdef CONFIG_MAC80211_DEBUGFS 3566 int rs_pretty_print_rate(char *buf, const u32 rate) 3567 { 3568 3569 char *type, *bw; 3570 u8 mcs = 0, nss = 0; 3571 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3572 3573 if (!(rate & RATE_MCS_HT_MSK) && 3574 !(rate & RATE_MCS_VHT_MSK)) { 3575 int index = iwl_hwrate_to_plcp_idx(rate); 3576 3577 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3578 rs_pretty_ant(ant), 3579 index == IWL_RATE_INVALID ? "BAD" : 3580 iwl_rate_mcs[index].mbps); 3581 } 3582 3583 if (rate & RATE_MCS_VHT_MSK) { 3584 type = "VHT"; 3585 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3586 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3587 >> RATE_VHT_MCS_NSS_POS) + 1; 3588 } else if (rate & RATE_MCS_HT_MSK) { 3589 type = "HT"; 3590 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3591 } else { 3592 type = "Unknown"; /* shouldn't happen */ 3593 } 3594 3595 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3596 case RATE_MCS_CHAN_WIDTH_20: 3597 bw = "20Mhz"; 3598 break; 3599 case RATE_MCS_CHAN_WIDTH_40: 3600 bw = "40Mhz"; 3601 break; 3602 case RATE_MCS_CHAN_WIDTH_80: 3603 bw = "80Mhz"; 3604 break; 3605 case RATE_MCS_CHAN_WIDTH_160: 3606 bw = "160Mhz"; 3607 break; 3608 default: 3609 bw = "BAD BW"; 3610 } 3611 3612 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n", 3613 type, rs_pretty_ant(ant), bw, mcs, nss, 3614 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3615 (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "", 3616 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3617 (rate & RATE_MCS_BF_MSK) ? "BF " : "", 3618 (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : ""); 3619 } 3620 3621 /** 3622 * Program the device to use fixed rate for frame transmit 3623 * This is for debugging/testing only 3624 * once the device start use fixed rate, we need to reload the module 3625 * to being back the normal operation. 3626 */ 3627 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3628 struct iwl_lq_sta *lq_sta) 3629 { 3630 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3631 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3632 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3633 3634 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3635 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3636 3637 if (lq_sta->pers.dbg_fixed_rate) { 3638 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3639 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3640 } 3641 } 3642 3643 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3644 const char __user *user_buf, size_t count, loff_t *ppos) 3645 { 3646 struct iwl_lq_sta *lq_sta = file->private_data; 3647 struct iwl_mvm *mvm; 3648 char buf[64]; 3649 size_t buf_size; 3650 u32 parsed_rate; 3651 3652 mvm = lq_sta->pers.drv; 3653 memset(buf, 0, sizeof(buf)); 3654 buf_size = min(count, sizeof(buf) - 1); 3655 if (copy_from_user(buf, user_buf, buf_size)) 3656 return -EFAULT; 3657 3658 if (sscanf(buf, "%x", &parsed_rate) == 1) 3659 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3660 else 3661 lq_sta->pers.dbg_fixed_rate = 0; 3662 3663 rs_program_fix_rate(mvm, lq_sta); 3664 3665 return count; 3666 } 3667 3668 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3669 char __user *user_buf, size_t count, loff_t *ppos) 3670 { 3671 char *buff; 3672 int desc = 0; 3673 int i = 0; 3674 ssize_t ret; 3675 3676 struct iwl_lq_sta *lq_sta = file->private_data; 3677 struct iwl_mvm_sta *mvmsta = 3678 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3679 struct iwl_mvm *mvm; 3680 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3681 struct rs_rate *rate = &tbl->rate; 3682 u32 ss_params; 3683 3684 mvm = lq_sta->pers.drv; 3685 buff = kmalloc(2048, GFP_KERNEL); 3686 if (!buff) 3687 return -ENOMEM; 3688 3689 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3690 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3691 lq_sta->total_failed, lq_sta->total_success, 3692 lq_sta->active_legacy_rate); 3693 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3694 lq_sta->pers.dbg_fixed_rate); 3695 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3696 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3697 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3698 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3699 desc += sprintf(buff+desc, "lq type %s\n", 3700 (is_legacy(rate)) ? "legacy" : 3701 is_vht(rate) ? "VHT" : "HT"); 3702 if (!is_legacy(rate)) { 3703 desc += sprintf(buff + desc, " %s", 3704 (is_siso(rate)) ? "SISO" : "MIMO2"); 3705 desc += sprintf(buff + desc, " %s", 3706 (is_ht20(rate)) ? "20MHz" : 3707 (is_ht40(rate)) ? "40MHz" : 3708 (is_ht80(rate)) ? "80Mhz" : "BAD BW"); 3709 desc += sprintf(buff + desc, " %s %s %s %s\n", 3710 (rate->sgi) ? "SGI" : "NGI", 3711 (rate->ldpc) ? "LDPC" : "BCC", 3712 (lq_sta->is_agg) ? "AGG on" : "", 3713 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3714 } 3715 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3716 lq_sta->last_rate_n_flags); 3717 desc += sprintf(buff+desc, 3718 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3719 lq_sta->lq.flags, 3720 lq_sta->lq.mimo_delim, 3721 lq_sta->lq.single_stream_ant_msk, 3722 lq_sta->lq.dual_stream_ant_msk); 3723 3724 desc += sprintf(buff+desc, 3725 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3726 le16_to_cpu(lq_sta->lq.agg_time_limit), 3727 lq_sta->lq.agg_disable_start_th, 3728 lq_sta->lq.agg_frame_cnt_limit); 3729 3730 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3731 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3732 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3733 (ss_params & LQ_SS_PARAMS_VALID) ? 3734 "VALID" : "INVALID", 3735 (ss_params & LQ_SS_BFER_ALLOWED) ? 3736 ", BFER" : "", 3737 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3738 ", STBC" : "", 3739 (ss_params & LQ_SS_FORCE) ? 3740 ", FORCE" : ""); 3741 desc += sprintf(buff+desc, 3742 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3743 lq_sta->lq.initial_rate_index[0], 3744 lq_sta->lq.initial_rate_index[1], 3745 lq_sta->lq.initial_rate_index[2], 3746 lq_sta->lq.initial_rate_index[3]); 3747 3748 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3749 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3750 3751 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3752 desc += rs_pretty_print_rate(buff+desc, r); 3753 } 3754 3755 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3756 kfree(buff); 3757 return ret; 3758 } 3759 3760 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3761 .write = rs_sta_dbgfs_scale_table_write, 3762 .read = rs_sta_dbgfs_scale_table_read, 3763 .open = simple_open, 3764 .llseek = default_llseek, 3765 }; 3766 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3767 char __user *user_buf, size_t count, loff_t *ppos) 3768 { 3769 char *buff; 3770 int desc = 0; 3771 int i, j; 3772 ssize_t ret; 3773 struct iwl_scale_tbl_info *tbl; 3774 struct rs_rate *rate; 3775 struct iwl_lq_sta *lq_sta = file->private_data; 3776 3777 buff = kmalloc(1024, GFP_KERNEL); 3778 if (!buff) 3779 return -ENOMEM; 3780 3781 for (i = 0; i < LQ_SIZE; i++) { 3782 tbl = &(lq_sta->lq_info[i]); 3783 rate = &tbl->rate; 3784 desc += sprintf(buff+desc, 3785 "%s type=%d SGI=%d BW=%s DUP=0\n" 3786 "index=%d\n", 3787 lq_sta->active_tbl == i ? "*" : "x", 3788 rate->type, 3789 rate->sgi, 3790 is_ht20(rate) ? "20Mhz" : 3791 is_ht40(rate) ? "40Mhz" : 3792 is_ht80(rate) ? "80Mhz" : "ERR", 3793 rate->index); 3794 for (j = 0; j < IWL_RATE_COUNT; j++) { 3795 desc += sprintf(buff+desc, 3796 "counter=%d success=%d %%=%d\n", 3797 tbl->win[j].counter, 3798 tbl->win[j].success_counter, 3799 tbl->win[j].success_ratio); 3800 } 3801 } 3802 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3803 kfree(buff); 3804 return ret; 3805 } 3806 3807 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3808 .read = rs_sta_dbgfs_stats_table_read, 3809 .open = simple_open, 3810 .llseek = default_llseek, 3811 }; 3812 3813 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3814 char __user *user_buf, 3815 size_t count, loff_t *ppos) 3816 { 3817 static const char * const column_name[] = { 3818 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3819 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3820 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3821 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3822 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3823 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3824 [RS_COLUMN_MIMO2] = "MIMO2", 3825 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3826 }; 3827 3828 static const char * const rate_name[] = { 3829 [IWL_RATE_1M_INDEX] = "1M", 3830 [IWL_RATE_2M_INDEX] = "2M", 3831 [IWL_RATE_5M_INDEX] = "5.5M", 3832 [IWL_RATE_11M_INDEX] = "11M", 3833 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3834 [IWL_RATE_9M_INDEX] = "9M", 3835 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3836 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3837 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3838 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3839 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3840 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3841 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3842 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3843 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3844 }; 3845 3846 char *buff, *pos, *endpos; 3847 int col, rate; 3848 ssize_t ret; 3849 struct iwl_lq_sta *lq_sta = file->private_data; 3850 struct rs_rate_stats *stats; 3851 static const size_t bufsz = 1024; 3852 3853 buff = kmalloc(bufsz, GFP_KERNEL); 3854 if (!buff) 3855 return -ENOMEM; 3856 3857 pos = buff; 3858 endpos = pos + bufsz; 3859 3860 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3861 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3862 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3863 pos += scnprintf(pos, endpos - pos, "\n"); 3864 3865 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3866 pos += scnprintf(pos, endpos - pos, 3867 "%s,", column_name[col]); 3868 3869 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3870 stats = &(lq_sta->pers.tx_stats[col][rate]); 3871 pos += scnprintf(pos, endpos - pos, 3872 "%llu/%llu,", 3873 stats->success, 3874 stats->total); 3875 } 3876 pos += scnprintf(pos, endpos - pos, "\n"); 3877 } 3878 3879 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3880 kfree(buff); 3881 return ret; 3882 } 3883 3884 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3885 const char __user *user_buf, 3886 size_t count, loff_t *ppos) 3887 { 3888 struct iwl_lq_sta *lq_sta = file->private_data; 3889 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3890 3891 return count; 3892 } 3893 3894 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3895 .read = rs_sta_dbgfs_drv_tx_stats_read, 3896 .write = rs_sta_dbgfs_drv_tx_stats_write, 3897 .open = simple_open, 3898 .llseek = default_llseek, 3899 }; 3900 3901 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3902 char __user *user_buf, 3903 size_t count, loff_t *ppos) 3904 { 3905 struct iwl_lq_sta *lq_sta = file->private_data; 3906 char buf[12]; 3907 int bufsz = sizeof(buf); 3908 int pos = 0; 3909 static const char * const ss_force_name[] = { 3910 [RS_SS_FORCE_NONE] = "none", 3911 [RS_SS_FORCE_STBC] = "stbc", 3912 [RS_SS_FORCE_BFER] = "bfer", 3913 [RS_SS_FORCE_SISO] = "siso", 3914 }; 3915 3916 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3917 ss_force_name[lq_sta->pers.ss_force]); 3918 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3919 } 3920 3921 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3922 size_t count, loff_t *ppos) 3923 { 3924 struct iwl_mvm *mvm = lq_sta->pers.drv; 3925 int ret = 0; 3926 3927 if (!strncmp("none", buf, 4)) { 3928 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3929 } else if (!strncmp("siso", buf, 4)) { 3930 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3931 } else if (!strncmp("stbc", buf, 4)) { 3932 if (lq_sta->stbc_capable) { 3933 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3934 } else { 3935 IWL_ERR(mvm, 3936 "can't force STBC. peer doesn't support\n"); 3937 ret = -EINVAL; 3938 } 3939 } else if (!strncmp("bfer", buf, 4)) { 3940 if (lq_sta->bfer_capable) { 3941 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3942 } else { 3943 IWL_ERR(mvm, 3944 "can't force BFER. peer doesn't support\n"); 3945 ret = -EINVAL; 3946 } 3947 } else { 3948 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3949 ret = -EINVAL; 3950 } 3951 return ret ?: count; 3952 } 3953 3954 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3955 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3956 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3957 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3958 &iwl_dbgfs_##name##_ops)) \ 3959 goto err; \ 3960 } while (0) 3961 3962 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3963 3964 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3965 { 3966 struct iwl_lq_sta *lq_sta = priv_sta; 3967 struct iwl_mvm_sta *mvmsta; 3968 3969 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3970 3971 if (!mvmsta->vif) 3972 return; 3973 3974 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 3975 lq_sta, &rs_sta_dbgfs_scale_table_ops); 3976 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 3977 lq_sta, &rs_sta_dbgfs_stats_table_ops); 3978 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 3979 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 3980 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 3981 &lq_sta->tx_agg_tid_en); 3982 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 3983 &lq_sta->pers.dbg_fixed_txp_reduction); 3984 3985 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 3986 return; 3987 err: 3988 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 3989 } 3990 3991 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 3992 { 3993 } 3994 #endif 3995 3996 /* 3997 * Initialization of rate scaling information is done by driver after 3998 * the station is added. Since mac80211 calls this function before a 3999 * station is added we ignore it. 4000 */ 4001 static void rs_rate_init_stub(void *mvm_r, 4002 struct ieee80211_supported_band *sband, 4003 struct cfg80211_chan_def *chandef, 4004 struct ieee80211_sta *sta, void *mvm_sta) 4005 { 4006 } 4007 4008 static const struct rate_control_ops rs_mvm_ops = { 4009 .name = RS_NAME, 4010 .tx_status = rs_mac80211_tx_status, 4011 .get_rate = rs_get_rate, 4012 .rate_init = rs_rate_init_stub, 4013 .alloc = rs_alloc, 4014 .free = rs_free, 4015 .alloc_sta = rs_alloc_sta, 4016 .free_sta = rs_free_sta, 4017 .rate_update = rs_rate_update, 4018 #ifdef CONFIG_MAC80211_DEBUGFS 4019 .add_sta_debugfs = rs_add_debugfs, 4020 .remove_sta_debugfs = rs_remove_debugfs, 4021 #endif 4022 }; 4023 4024 int iwl_mvm_rate_control_register(void) 4025 { 4026 return ieee80211_rate_control_register(&rs_mvm_ops); 4027 } 4028 4029 void iwl_mvm_rate_control_unregister(void) 4030 { 4031 ieee80211_rate_control_unregister(&rs_mvm_ops); 4032 } 4033 4034 /** 4035 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4036 * Tx protection, according to this request and previous requests, 4037 * and send the LQ command. 4038 * @mvmsta: The station 4039 * @enable: Enable Tx protection? 4040 */ 4041 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4042 bool enable) 4043 { 4044 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4045 4046 lockdep_assert_held(&mvm->mutex); 4047 4048 if (enable) { 4049 if (mvmsta->tx_protection == 0) 4050 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4051 mvmsta->tx_protection++; 4052 } else { 4053 mvmsta->tx_protection--; 4054 if (mvmsta->tx_protection == 0) 4055 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4056 } 4057 4058 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4059 } 4060