1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 6 * Copyright(c) 2018 Intel Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of version 2 of the GNU General Public License as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * The full GNU General Public License is included in this distribution in the 18 * file called LICENSE. 19 * 20 * Contact Information: 21 * Intel Linux Wireless <linuxwifi@intel.com> 22 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 23 * 24 *****************************************************************************/ 25 #include <linux/kernel.h> 26 #include <linux/skbuff.h> 27 #include <linux/slab.h> 28 #include <net/mac80211.h> 29 30 #include <linux/netdevice.h> 31 #include <linux/etherdevice.h> 32 #include <linux/delay.h> 33 34 #include <linux/workqueue.h> 35 #include "rs.h" 36 #include "fw-api.h" 37 #include "sta.h" 38 #include "iwl-op-mode.h" 39 #include "mvm.h" 40 #include "debugfs.h" 41 42 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 43 44 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 45 * Use this macro when dealing with thresholds consts set as a percentage 46 */ 47 #define RS_PERCENT(x) (128 * x) 48 49 static u8 rs_ht_to_legacy[] = { 50 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 51 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 52 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 53 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 54 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 55 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 56 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 57 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 58 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 59 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 60 }; 61 62 static const u8 ant_toggle_lookup[] = { 63 [ANT_NONE] = ANT_NONE, 64 [ANT_A] = ANT_B, 65 [ANT_B] = ANT_A, 66 [ANT_AB] = ANT_AB, 67 }; 68 69 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 70 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 71 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 72 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 73 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 74 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 75 IWL_RATE_##rp##M_INDEX, \ 76 IWL_RATE_##rn##M_INDEX } 77 78 #define IWL_DECLARE_MCS_RATE(s) \ 79 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 84 IWL_RATE_INVM_INDEX, \ 85 IWL_RATE_INVM_INDEX } 86 87 /* 88 * Parameter order: 89 * rate, ht rate, prev rate, next rate 90 * 91 * If there isn't a valid next or previous rate then INV is used which 92 * maps to IWL_RATE_INVALID 93 * 94 */ 95 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 96 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 97 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 98 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 99 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 100 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 101 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 102 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 103 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 104 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 105 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 106 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 107 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 108 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 109 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 110 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 111 }; 112 113 enum rs_action { 114 RS_ACTION_STAY = 0, 115 RS_ACTION_DOWNSCALE = -1, 116 RS_ACTION_UPSCALE = 1, 117 }; 118 119 enum rs_column_mode { 120 RS_INVALID = 0, 121 RS_LEGACY, 122 RS_SISO, 123 RS_MIMO2, 124 }; 125 126 #define MAX_NEXT_COLUMNS 7 127 #define MAX_COLUMN_CHECKS 3 128 129 struct rs_tx_column; 130 131 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 132 struct ieee80211_sta *sta, 133 struct rs_rate *rate, 134 const struct rs_tx_column *next_col); 135 136 struct rs_tx_column { 137 enum rs_column_mode mode; 138 u8 ant; 139 bool sgi; 140 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 141 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 142 }; 143 144 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 145 struct rs_rate *rate, 146 const struct rs_tx_column *next_col) 147 { 148 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 149 } 150 151 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 152 struct rs_rate *rate, 153 const struct rs_tx_column *next_col) 154 { 155 if (!sta->ht_cap.ht_supported) 156 return false; 157 158 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 159 return false; 160 161 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 162 return false; 163 164 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 165 return false; 166 167 if (mvm->nvm_data->sku_cap_mimo_disabled) 168 return false; 169 170 return true; 171 } 172 173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 174 struct rs_rate *rate, 175 const struct rs_tx_column *next_col) 176 { 177 if (!sta->ht_cap.ht_supported) 178 return false; 179 180 return true; 181 } 182 183 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 184 struct rs_rate *rate, 185 const struct rs_tx_column *next_col) 186 { 187 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 188 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 189 190 if (is_ht20(rate) && (ht_cap->cap & 191 IEEE80211_HT_CAP_SGI_20)) 192 return true; 193 if (is_ht40(rate) && (ht_cap->cap & 194 IEEE80211_HT_CAP_SGI_40)) 195 return true; 196 if (is_ht80(rate) && (vht_cap->cap & 197 IEEE80211_VHT_CAP_SHORT_GI_80)) 198 return true; 199 if (is_ht160(rate) && (vht_cap->cap & 200 IEEE80211_VHT_CAP_SHORT_GI_160)) 201 return true; 202 203 return false; 204 } 205 206 static const struct rs_tx_column rs_tx_columns[] = { 207 [RS_COLUMN_LEGACY_ANT_A] = { 208 .mode = RS_LEGACY, 209 .ant = ANT_A, 210 .next_columns = { 211 RS_COLUMN_LEGACY_ANT_B, 212 RS_COLUMN_SISO_ANT_A, 213 RS_COLUMN_MIMO2, 214 RS_COLUMN_INVALID, 215 RS_COLUMN_INVALID, 216 RS_COLUMN_INVALID, 217 RS_COLUMN_INVALID, 218 }, 219 .checks = { 220 rs_ant_allow, 221 }, 222 }, 223 [RS_COLUMN_LEGACY_ANT_B] = { 224 .mode = RS_LEGACY, 225 .ant = ANT_B, 226 .next_columns = { 227 RS_COLUMN_LEGACY_ANT_A, 228 RS_COLUMN_SISO_ANT_B, 229 RS_COLUMN_MIMO2, 230 RS_COLUMN_INVALID, 231 RS_COLUMN_INVALID, 232 RS_COLUMN_INVALID, 233 RS_COLUMN_INVALID, 234 }, 235 .checks = { 236 rs_ant_allow, 237 }, 238 }, 239 [RS_COLUMN_SISO_ANT_A] = { 240 .mode = RS_SISO, 241 .ant = ANT_A, 242 .next_columns = { 243 RS_COLUMN_SISO_ANT_B, 244 RS_COLUMN_MIMO2, 245 RS_COLUMN_SISO_ANT_A_SGI, 246 RS_COLUMN_LEGACY_ANT_A, 247 RS_COLUMN_LEGACY_ANT_B, 248 RS_COLUMN_INVALID, 249 RS_COLUMN_INVALID, 250 }, 251 .checks = { 252 rs_siso_allow, 253 rs_ant_allow, 254 }, 255 }, 256 [RS_COLUMN_SISO_ANT_B] = { 257 .mode = RS_SISO, 258 .ant = ANT_B, 259 .next_columns = { 260 RS_COLUMN_SISO_ANT_A, 261 RS_COLUMN_MIMO2, 262 RS_COLUMN_SISO_ANT_B_SGI, 263 RS_COLUMN_LEGACY_ANT_A, 264 RS_COLUMN_LEGACY_ANT_B, 265 RS_COLUMN_INVALID, 266 RS_COLUMN_INVALID, 267 }, 268 .checks = { 269 rs_siso_allow, 270 rs_ant_allow, 271 }, 272 }, 273 [RS_COLUMN_SISO_ANT_A_SGI] = { 274 .mode = RS_SISO, 275 .ant = ANT_A, 276 .sgi = true, 277 .next_columns = { 278 RS_COLUMN_SISO_ANT_B_SGI, 279 RS_COLUMN_MIMO2_SGI, 280 RS_COLUMN_SISO_ANT_A, 281 RS_COLUMN_LEGACY_ANT_A, 282 RS_COLUMN_LEGACY_ANT_B, 283 RS_COLUMN_INVALID, 284 RS_COLUMN_INVALID, 285 }, 286 .checks = { 287 rs_siso_allow, 288 rs_ant_allow, 289 rs_sgi_allow, 290 }, 291 }, 292 [RS_COLUMN_SISO_ANT_B_SGI] = { 293 .mode = RS_SISO, 294 .ant = ANT_B, 295 .sgi = true, 296 .next_columns = { 297 RS_COLUMN_SISO_ANT_A_SGI, 298 RS_COLUMN_MIMO2_SGI, 299 RS_COLUMN_SISO_ANT_B, 300 RS_COLUMN_LEGACY_ANT_A, 301 RS_COLUMN_LEGACY_ANT_B, 302 RS_COLUMN_INVALID, 303 RS_COLUMN_INVALID, 304 }, 305 .checks = { 306 rs_siso_allow, 307 rs_ant_allow, 308 rs_sgi_allow, 309 }, 310 }, 311 [RS_COLUMN_MIMO2] = { 312 .mode = RS_MIMO2, 313 .ant = ANT_AB, 314 .next_columns = { 315 RS_COLUMN_SISO_ANT_A, 316 RS_COLUMN_MIMO2_SGI, 317 RS_COLUMN_LEGACY_ANT_A, 318 RS_COLUMN_LEGACY_ANT_B, 319 RS_COLUMN_INVALID, 320 RS_COLUMN_INVALID, 321 RS_COLUMN_INVALID, 322 }, 323 .checks = { 324 rs_mimo_allow, 325 }, 326 }, 327 [RS_COLUMN_MIMO2_SGI] = { 328 .mode = RS_MIMO2, 329 .ant = ANT_AB, 330 .sgi = true, 331 .next_columns = { 332 RS_COLUMN_SISO_ANT_A_SGI, 333 RS_COLUMN_MIMO2, 334 RS_COLUMN_LEGACY_ANT_A, 335 RS_COLUMN_LEGACY_ANT_B, 336 RS_COLUMN_INVALID, 337 RS_COLUMN_INVALID, 338 RS_COLUMN_INVALID, 339 }, 340 .checks = { 341 rs_mimo_allow, 342 rs_sgi_allow, 343 }, 344 }, 345 }; 346 347 static inline u8 rs_extract_rate(u32 rate_n_flags) 348 { 349 /* also works for HT because bits 7:6 are zero there */ 350 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 351 } 352 353 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 354 { 355 int idx = 0; 356 357 if (rate_n_flags & RATE_MCS_HT_MSK) { 358 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 359 idx += IWL_RATE_MCS_0_INDEX; 360 361 /* skip 9M not supported in HT*/ 362 if (idx >= IWL_RATE_9M_INDEX) 363 idx += 1; 364 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 365 return idx; 366 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 367 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 368 idx += IWL_RATE_MCS_0_INDEX; 369 370 /* skip 9M not supported in VHT*/ 371 if (idx >= IWL_RATE_9M_INDEX) 372 idx++; 373 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 374 return idx; 375 } else { 376 /* legacy rate format, search for match in table */ 377 378 u8 legacy_rate = rs_extract_rate(rate_n_flags); 379 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 380 if (iwl_rates[idx].plcp == legacy_rate) 381 return idx; 382 } 383 384 return IWL_RATE_INVALID; 385 } 386 387 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 388 struct ieee80211_sta *sta, 389 struct iwl_lq_sta *lq_sta, 390 int tid, bool ndp); 391 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 392 struct ieee80211_sta *sta, 393 struct iwl_lq_sta *lq_sta, 394 const struct rs_rate *initial_rate); 395 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 396 397 /** 398 * The following tables contain the expected throughput metrics for all rates 399 * 400 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 401 * 402 * where invalid entries are zeros. 403 * 404 * CCK rates are only valid in legacy table and will only be used in G 405 * (2.4 GHz) band. 406 */ 407 408 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 409 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 410 }; 411 412 /* Expected TpT tables. 4 indexes: 413 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 414 */ 415 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 416 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 417 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 418 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 419 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 420 }; 421 422 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 423 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 424 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 425 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 426 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 427 }; 428 429 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 430 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 431 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 432 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 433 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 434 }; 435 436 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 437 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 438 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 439 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 440 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 441 }; 442 443 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 444 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 445 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 446 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 447 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 448 }; 449 450 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 451 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 452 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 453 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 454 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 455 }; 456 457 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 458 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 459 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 460 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 461 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 462 }; 463 464 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 465 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 466 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 467 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 468 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 469 }; 470 471 /* mbps, mcs */ 472 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 473 { "1", "BPSK DSSS"}, 474 { "2", "QPSK DSSS"}, 475 {"5.5", "BPSK CCK"}, 476 { "11", "QPSK CCK"}, 477 { "6", "BPSK 1/2"}, 478 { "9", "BPSK 1/2"}, 479 { "12", "QPSK 1/2"}, 480 { "18", "QPSK 3/4"}, 481 { "24", "16QAM 1/2"}, 482 { "36", "16QAM 3/4"}, 483 { "48", "64QAM 2/3"}, 484 { "54", "64QAM 3/4"}, 485 { "60", "64QAM 5/6"}, 486 }; 487 488 #define MCS_INDEX_PER_STREAM (8) 489 490 static const char *rs_pretty_ant(u8 ant) 491 { 492 static const char * const ant_name[] = { 493 [ANT_NONE] = "None", 494 [ANT_A] = "A", 495 [ANT_B] = "B", 496 [ANT_AB] = "AB", 497 [ANT_C] = "C", 498 [ANT_AC] = "AC", 499 [ANT_BC] = "BC", 500 [ANT_ABC] = "ABC", 501 }; 502 503 if (ant > ANT_ABC) 504 return "UNKNOWN"; 505 506 return ant_name[ant]; 507 } 508 509 static const char *rs_pretty_lq_type(enum iwl_table_type type) 510 { 511 static const char * const lq_types[] = { 512 [LQ_NONE] = "NONE", 513 [LQ_LEGACY_A] = "LEGACY_A", 514 [LQ_LEGACY_G] = "LEGACY_G", 515 [LQ_HT_SISO] = "HT SISO", 516 [LQ_HT_MIMO2] = "HT MIMO", 517 [LQ_VHT_SISO] = "VHT SISO", 518 [LQ_VHT_MIMO2] = "VHT MIMO", 519 }; 520 521 if (type < LQ_NONE || type >= LQ_MAX) 522 return "UNKNOWN"; 523 524 return lq_types[type]; 525 } 526 527 static char *rs_pretty_rate(const struct rs_rate *rate) 528 { 529 static char buf[40]; 530 static const char * const legacy_rates[] = { 531 [IWL_RATE_1M_INDEX] = "1M", 532 [IWL_RATE_2M_INDEX] = "2M", 533 [IWL_RATE_5M_INDEX] = "5.5M", 534 [IWL_RATE_11M_INDEX] = "11M", 535 [IWL_RATE_6M_INDEX] = "6M", 536 [IWL_RATE_9M_INDEX] = "9M", 537 [IWL_RATE_12M_INDEX] = "12M", 538 [IWL_RATE_18M_INDEX] = "18M", 539 [IWL_RATE_24M_INDEX] = "24M", 540 [IWL_RATE_36M_INDEX] = "36M", 541 [IWL_RATE_48M_INDEX] = "48M", 542 [IWL_RATE_54M_INDEX] = "54M", 543 }; 544 static const char *const ht_vht_rates[] = { 545 [IWL_RATE_MCS_0_INDEX] = "MCS0", 546 [IWL_RATE_MCS_1_INDEX] = "MCS1", 547 [IWL_RATE_MCS_2_INDEX] = "MCS2", 548 [IWL_RATE_MCS_3_INDEX] = "MCS3", 549 [IWL_RATE_MCS_4_INDEX] = "MCS4", 550 [IWL_RATE_MCS_5_INDEX] = "MCS5", 551 [IWL_RATE_MCS_6_INDEX] = "MCS6", 552 [IWL_RATE_MCS_7_INDEX] = "MCS7", 553 [IWL_RATE_MCS_8_INDEX] = "MCS8", 554 [IWL_RATE_MCS_9_INDEX] = "MCS9", 555 }; 556 const char *rate_str; 557 558 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 559 rate_str = legacy_rates[rate->index]; 560 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 561 (rate->index >= IWL_RATE_MCS_0_INDEX) && 562 (rate->index <= IWL_RATE_MCS_9_INDEX)) 563 rate_str = ht_vht_rates[rate->index]; 564 else 565 rate_str = "BAD_RATE"; 566 567 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 568 rs_pretty_ant(rate->ant), rate_str); 569 return buf; 570 } 571 572 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 573 const char *prefix) 574 { 575 IWL_DEBUG_RATE(mvm, 576 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 577 prefix, rs_pretty_rate(rate), rate->bw, 578 rate->sgi, rate->ldpc, rate->stbc); 579 } 580 581 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 582 { 583 window->data = 0; 584 window->success_counter = 0; 585 window->success_ratio = IWL_INVALID_VALUE; 586 window->counter = 0; 587 window->average_tpt = IWL_INVALID_VALUE; 588 } 589 590 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 591 struct iwl_scale_tbl_info *tbl) 592 { 593 int i; 594 595 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 596 for (i = 0; i < IWL_RATE_COUNT; i++) 597 rs_rate_scale_clear_window(&tbl->win[i]); 598 599 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 600 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 601 } 602 603 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 604 { 605 return (ant_type & valid_antenna) == ant_type; 606 } 607 608 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 609 struct iwl_lq_sta *lq_data, u8 tid, 610 struct ieee80211_sta *sta) 611 { 612 int ret = -EAGAIN; 613 614 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 615 sta->addr, tid); 616 617 /* start BA session until the peer sends del BA */ 618 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 619 if (ret == -EAGAIN) { 620 /* 621 * driver and mac80211 is out of sync 622 * this might be cause by reloading firmware 623 * stop the tx ba session here 624 */ 625 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 626 tid); 627 ieee80211_stop_tx_ba_session(sta, tid); 628 } 629 return ret; 630 } 631 632 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 633 u8 tid, struct iwl_lq_sta *lq_sta, 634 struct ieee80211_sta *sta) 635 { 636 struct iwl_mvm_tid_data *tid_data; 637 638 /* 639 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 640 * when the frame is not QoS 641 */ 642 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 643 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 644 tid, IWL_MAX_TID_COUNT); 645 return; 646 } else if (tid == IWL_MAX_TID_COUNT) { 647 return; 648 } 649 650 tid_data = &mvmsta->tid_data[tid]; 651 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 652 tid_data->state == IWL_AGG_OFF && 653 (lq_sta->tx_agg_tid_en & BIT(tid)) && 654 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 655 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 656 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 657 tid_data->state = IWL_AGG_QUEUED; 658 } 659 } 660 661 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 662 { 663 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 664 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 665 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 666 } 667 668 /* 669 * Static function to get the expected throughput from an iwl_scale_tbl_info 670 * that wraps a NULL pointer check 671 */ 672 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 673 { 674 if (tbl->expected_tpt) 675 return tbl->expected_tpt[rs_index]; 676 return 0; 677 } 678 679 /** 680 * rs_collect_tx_data - Update the success/failure sliding window 681 * 682 * We keep a sliding window of the last 62 packets transmitted 683 * at this rate. window->data contains the bitmask of successful 684 * packets. 685 */ 686 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 687 struct iwl_scale_tbl_info *tbl, 688 int scale_index, int attempts, int successes, 689 struct iwl_rate_scale_data *window) 690 { 691 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 692 s32 fail_count, tpt; 693 694 /* Get expected throughput */ 695 tpt = get_expected_tpt(tbl, scale_index); 696 697 /* 698 * Keep track of only the latest 62 tx frame attempts in this rate's 699 * history window; anything older isn't really relevant any more. 700 * If we have filled up the sliding window, drop the oldest attempt; 701 * if the oldest attempt (highest bit in bitmap) shows "success", 702 * subtract "1" from the success counter (this is the main reason 703 * we keep these bitmaps!). 704 */ 705 while (attempts > 0) { 706 if (window->counter >= IWL_RATE_MAX_WINDOW) { 707 /* remove earliest */ 708 window->counter = IWL_RATE_MAX_WINDOW - 1; 709 710 if (window->data & mask) { 711 window->data &= ~mask; 712 window->success_counter--; 713 } 714 } 715 716 /* Increment frames-attempted counter */ 717 window->counter++; 718 719 /* Shift bitmap by one frame to throw away oldest history */ 720 window->data <<= 1; 721 722 /* Mark the most recent #successes attempts as successful */ 723 if (successes > 0) { 724 window->success_counter++; 725 window->data |= 0x1; 726 successes--; 727 } 728 729 attempts--; 730 } 731 732 /* Calculate current success ratio, avoid divide-by-0! */ 733 if (window->counter > 0) 734 window->success_ratio = 128 * (100 * window->success_counter) 735 / window->counter; 736 else 737 window->success_ratio = IWL_INVALID_VALUE; 738 739 fail_count = window->counter - window->success_counter; 740 741 /* Calculate average throughput, if we have enough history. */ 742 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 743 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 744 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 745 else 746 window->average_tpt = IWL_INVALID_VALUE; 747 748 return 0; 749 } 750 751 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 752 struct iwl_lq_sta *lq_sta, 753 struct iwl_scale_tbl_info *tbl, 754 int scale_index, int attempts, int successes, 755 u8 reduced_txp) 756 { 757 struct iwl_rate_scale_data *window = NULL; 758 759 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 760 return -EINVAL; 761 762 window = &tbl->tpc_win[reduced_txp]; 763 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 764 window); 765 } 766 767 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 768 struct iwl_mvm_sta *mvmsta, 769 u8 tid, int successes) 770 { 771 struct iwl_mvm_tid_data *tid_data; 772 773 if (tid >= IWL_MAX_TID_COUNT) 774 return; 775 776 tid_data = &mvmsta->tid_data[tid]; 777 778 /* 779 * Measure if there're enough successful transmits per second. 780 * These statistics are used only to decide if we can start a 781 * BA session, so it should be updated only when A-MPDU is 782 * off. 783 */ 784 if (tid_data->state != IWL_AGG_OFF) 785 return; 786 787 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 788 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 789 tid_data->tx_count_last = tid_data->tx_count; 790 tid_data->tx_count = 0; 791 tid_data->tpt_meas_start = jiffies; 792 } else { 793 tid_data->tx_count += successes; 794 } 795 } 796 797 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 798 struct iwl_mvm_sta *mvmsta, u8 tid, 799 struct iwl_scale_tbl_info *tbl, 800 int scale_index, int attempts, int successes) 801 { 802 struct iwl_rate_scale_data *window = NULL; 803 804 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 805 return -EINVAL; 806 807 if (tbl->column != RS_COLUMN_INVALID) { 808 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 809 810 pers->tx_stats[tbl->column][scale_index].total += attempts; 811 pers->tx_stats[tbl->column][scale_index].success += successes; 812 } 813 814 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 815 816 /* Select window for current tx bit rate */ 817 window = &(tbl->win[scale_index]); 818 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 819 window); 820 } 821 822 /* Convert rs_rate object into ucode rate bitmask */ 823 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 824 struct rs_rate *rate) 825 { 826 u32 ucode_rate = 0; 827 int index = rate->index; 828 829 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 830 RATE_MCS_ANT_ABC_MSK); 831 832 if (is_legacy(rate)) { 833 ucode_rate |= iwl_rates[index].plcp; 834 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 835 ucode_rate |= RATE_MCS_CCK_MSK; 836 return ucode_rate; 837 } 838 839 if (is_ht(rate)) { 840 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 841 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 842 index = IWL_LAST_HT_RATE; 843 } 844 ucode_rate |= RATE_MCS_HT_MSK; 845 846 if (is_ht_siso(rate)) 847 ucode_rate |= iwl_rates[index].plcp_ht_siso; 848 else if (is_ht_mimo2(rate)) 849 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 850 else 851 WARN_ON_ONCE(1); 852 } else if (is_vht(rate)) { 853 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 854 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 855 index = IWL_LAST_VHT_RATE; 856 } 857 ucode_rate |= RATE_MCS_VHT_MSK; 858 if (is_vht_siso(rate)) 859 ucode_rate |= iwl_rates[index].plcp_vht_siso; 860 else if (is_vht_mimo2(rate)) 861 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 862 else 863 WARN_ON_ONCE(1); 864 865 } else { 866 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 867 } 868 869 if (is_siso(rate) && rate->stbc) { 870 /* To enable STBC we need to set both a flag and ANT_AB */ 871 ucode_rate |= RATE_MCS_ANT_AB_MSK; 872 ucode_rate |= RATE_MCS_STBC_MSK; 873 } 874 875 ucode_rate |= rate->bw; 876 if (rate->sgi) 877 ucode_rate |= RATE_MCS_SGI_MSK; 878 if (rate->ldpc) 879 ucode_rate |= RATE_MCS_LDPC_MSK; 880 881 return ucode_rate; 882 } 883 884 /* Convert a ucode rate into an rs_rate object */ 885 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 886 enum nl80211_band band, 887 struct rs_rate *rate) 888 { 889 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 890 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 891 u8 nss; 892 893 memset(rate, 0, sizeof(*rate)); 894 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 895 896 if (rate->index == IWL_RATE_INVALID) 897 return -EINVAL; 898 899 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 900 901 /* Legacy */ 902 if (!(ucode_rate & RATE_MCS_HT_MSK) && 903 !(ucode_rate & RATE_MCS_VHT_MSK)) { 904 if (num_of_ant == 1) { 905 if (band == NL80211_BAND_5GHZ) 906 rate->type = LQ_LEGACY_A; 907 else 908 rate->type = LQ_LEGACY_G; 909 } 910 911 return 0; 912 } 913 914 /* HT or VHT */ 915 if (ucode_rate & RATE_MCS_SGI_MSK) 916 rate->sgi = true; 917 if (ucode_rate & RATE_MCS_LDPC_MSK) 918 rate->ldpc = true; 919 if (ucode_rate & RATE_MCS_STBC_MSK) 920 rate->stbc = true; 921 if (ucode_rate & RATE_MCS_BF_MSK) 922 rate->bfer = true; 923 924 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 925 926 if (ucode_rate & RATE_MCS_HT_MSK) { 927 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 928 RATE_HT_MCS_NSS_POS) + 1; 929 930 if (nss == 1) { 931 rate->type = LQ_HT_SISO; 932 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 933 "stbc %d bfer %d", 934 rate->stbc, rate->bfer); 935 } else if (nss == 2) { 936 rate->type = LQ_HT_MIMO2; 937 WARN_ON_ONCE(num_of_ant != 2); 938 } else { 939 WARN_ON_ONCE(1); 940 } 941 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 942 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 943 RATE_VHT_MCS_NSS_POS) + 1; 944 945 if (nss == 1) { 946 rate->type = LQ_VHT_SISO; 947 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 948 "stbc %d bfer %d", 949 rate->stbc, rate->bfer); 950 } else if (nss == 2) { 951 rate->type = LQ_VHT_MIMO2; 952 WARN_ON_ONCE(num_of_ant != 2); 953 } else { 954 WARN_ON_ONCE(1); 955 } 956 } 957 958 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 959 !is_vht(rate)); 960 961 return 0; 962 } 963 964 /* switch to another antenna/antennas and return 1 */ 965 /* if no other valid antenna found, return 0 */ 966 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 967 { 968 u8 new_ant_type; 969 970 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 971 return 0; 972 973 if (!rs_is_valid_ant(valid_ant, rate->ant)) 974 return 0; 975 976 new_ant_type = ant_toggle_lookup[rate->ant]; 977 978 while ((new_ant_type != rate->ant) && 979 !rs_is_valid_ant(valid_ant, new_ant_type)) 980 new_ant_type = ant_toggle_lookup[new_ant_type]; 981 982 if (new_ant_type == rate->ant) 983 return 0; 984 985 rate->ant = new_ant_type; 986 987 return 1; 988 } 989 990 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 991 struct rs_rate *rate) 992 { 993 if (is_legacy(rate)) 994 return lq_sta->active_legacy_rate; 995 else if (is_siso(rate)) 996 return lq_sta->active_siso_rate; 997 else if (is_mimo2(rate)) 998 return lq_sta->active_mimo2_rate; 999 1000 WARN_ON_ONCE(1); 1001 return 0; 1002 } 1003 1004 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1005 int rate_type) 1006 { 1007 u8 high = IWL_RATE_INVALID; 1008 u8 low = IWL_RATE_INVALID; 1009 1010 /* 802.11A or ht walks to the next literal adjacent rate in 1011 * the rate table */ 1012 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1013 int i; 1014 u32 mask; 1015 1016 /* Find the previous rate that is in the rate mask */ 1017 i = index - 1; 1018 if (i >= 0) 1019 mask = BIT(i); 1020 for (; i >= 0; i--, mask >>= 1) { 1021 if (rate_mask & mask) { 1022 low = i; 1023 break; 1024 } 1025 } 1026 1027 /* Find the next rate that is in the rate mask */ 1028 i = index + 1; 1029 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1030 if (rate_mask & mask) { 1031 high = i; 1032 break; 1033 } 1034 } 1035 1036 return (high << 8) | low; 1037 } 1038 1039 low = index; 1040 while (low != IWL_RATE_INVALID) { 1041 low = iwl_rates[low].prev_rs; 1042 if (low == IWL_RATE_INVALID) 1043 break; 1044 if (rate_mask & (1 << low)) 1045 break; 1046 } 1047 1048 high = index; 1049 while (high != IWL_RATE_INVALID) { 1050 high = iwl_rates[high].next_rs; 1051 if (high == IWL_RATE_INVALID) 1052 break; 1053 if (rate_mask & (1 << high)) 1054 break; 1055 } 1056 1057 return (high << 8) | low; 1058 } 1059 1060 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1061 struct rs_rate *rate) 1062 { 1063 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1064 } 1065 1066 /* Get the next supported lower rate in the current column. 1067 * Return true if bottom rate in the current column was reached 1068 */ 1069 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1070 struct rs_rate *rate) 1071 { 1072 u8 low; 1073 u16 high_low; 1074 u16 rate_mask; 1075 struct iwl_mvm *mvm = lq_sta->pers.drv; 1076 1077 rate_mask = rs_get_supported_rates(lq_sta, rate); 1078 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1079 rate->type); 1080 low = high_low & 0xff; 1081 1082 /* Bottom rate of column reached */ 1083 if (low == IWL_RATE_INVALID) 1084 return true; 1085 1086 rate->index = low; 1087 return false; 1088 } 1089 1090 /* Get the next rate to use following a column downgrade */ 1091 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1092 struct rs_rate *rate) 1093 { 1094 struct iwl_mvm *mvm = lq_sta->pers.drv; 1095 1096 if (is_legacy(rate)) { 1097 /* No column to downgrade from Legacy */ 1098 return; 1099 } else if (is_siso(rate)) { 1100 /* Downgrade to Legacy if we were in SISO */ 1101 if (lq_sta->band == NL80211_BAND_5GHZ) 1102 rate->type = LQ_LEGACY_A; 1103 else 1104 rate->type = LQ_LEGACY_G; 1105 1106 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1107 1108 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1109 rate->index > IWL_RATE_MCS_9_INDEX); 1110 1111 rate->index = rs_ht_to_legacy[rate->index]; 1112 rate->ldpc = false; 1113 } else { 1114 /* Downgrade to SISO with same MCS if in MIMO */ 1115 rate->type = is_vht_mimo2(rate) ? 1116 LQ_VHT_SISO : LQ_HT_SISO; 1117 } 1118 1119 if (num_of_ant(rate->ant) > 1) 1120 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1121 1122 /* Relevant in both switching to SISO or Legacy */ 1123 rate->sgi = false; 1124 1125 if (!rs_rate_supported(lq_sta, rate)) 1126 rs_get_lower_rate_in_column(lq_sta, rate); 1127 } 1128 1129 /* Check if both rates share the same column */ 1130 static inline bool rs_rate_column_match(struct rs_rate *a, 1131 struct rs_rate *b) 1132 { 1133 bool ant_match; 1134 1135 if (a->stbc || a->bfer) 1136 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1137 else 1138 ant_match = (a->ant == b->ant); 1139 1140 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1141 && ant_match; 1142 } 1143 1144 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1145 { 1146 if (is_legacy(rate)) { 1147 if (rate->ant == ANT_A) 1148 return RS_COLUMN_LEGACY_ANT_A; 1149 1150 if (rate->ant == ANT_B) 1151 return RS_COLUMN_LEGACY_ANT_B; 1152 1153 goto err; 1154 } 1155 1156 if (is_siso(rate)) { 1157 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1158 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1159 RS_COLUMN_SISO_ANT_A; 1160 1161 if (rate->ant == ANT_B) 1162 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1163 RS_COLUMN_SISO_ANT_B; 1164 1165 goto err; 1166 } 1167 1168 if (is_mimo(rate)) 1169 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1170 1171 err: 1172 return RS_COLUMN_INVALID; 1173 } 1174 1175 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1176 { 1177 u8 tid = IWL_MAX_TID_COUNT; 1178 1179 if (ieee80211_is_data_qos(hdr->frame_control)) { 1180 u8 *qc = ieee80211_get_qos_ctl(hdr); 1181 tid = qc[0] & 0xf; 1182 } 1183 1184 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1185 tid = IWL_MAX_TID_COUNT; 1186 1187 return tid; 1188 } 1189 1190 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1191 int tid, struct ieee80211_tx_info *info, bool ndp) 1192 { 1193 int legacy_success; 1194 int retries; 1195 int i; 1196 struct iwl_lq_cmd *table; 1197 u32 lq_hwrate; 1198 struct rs_rate lq_rate, tx_resp_rate; 1199 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1200 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1201 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1202 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1203 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1204 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1205 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 1206 1207 /* Treat uninitialized rate scaling data same as non-existing. */ 1208 if (!lq_sta) { 1209 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1210 return; 1211 } else if (!lq_sta->pers.drv) { 1212 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1213 return; 1214 } 1215 1216 /* This packet was aggregated but doesn't carry status info */ 1217 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1218 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1219 return; 1220 1221 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1222 1223 #ifdef CONFIG_MAC80211_DEBUGFS 1224 /* Disable last tx check if we are debugging with fixed rate but 1225 * update tx stats */ 1226 if (lq_sta->pers.dbg_fixed_rate) { 1227 int index = tx_resp_rate.index; 1228 enum rs_column column; 1229 int attempts, success; 1230 1231 column = rs_get_column_from_rate(&tx_resp_rate); 1232 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1233 "Can't map rate 0x%x to column", 1234 tx_resp_hwrate)) 1235 return; 1236 1237 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1238 attempts = info->status.ampdu_len; 1239 success = info->status.ampdu_ack_len; 1240 } else { 1241 attempts = info->status.rates[0].count; 1242 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1243 } 1244 1245 lq_sta->pers.tx_stats[column][index].total += attempts; 1246 lq_sta->pers.tx_stats[column][index].success += success; 1247 1248 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1249 tx_resp_hwrate, success, attempts); 1250 return; 1251 } 1252 #endif 1253 1254 if (time_after(jiffies, 1255 (unsigned long)(lq_sta->last_tx + 1256 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1257 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1258 iwl_mvm_rs_rate_init(mvm, sta, info->band); 1259 return; 1260 } 1261 lq_sta->last_tx = jiffies; 1262 1263 /* Ignore this Tx frame response if its initial rate doesn't match 1264 * that of latest Link Quality command. There may be stragglers 1265 * from a previous Link Quality command, but we're no longer interested 1266 * in those; they're either from the "active" mode while we're trying 1267 * to check "search" mode, or a prior "search" mode after we've moved 1268 * to a new "search" mode (which might become the new "active" mode). 1269 */ 1270 table = &lq_sta->lq; 1271 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1272 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1273 1274 /* Here we actually compare this rate to the latest LQ command */ 1275 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1276 IWL_DEBUG_RATE(mvm, 1277 "tx resp color 0x%x does not match 0x%x\n", 1278 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1279 1280 /* 1281 * Since rates mis-match, the last LQ command may have failed. 1282 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1283 * ... driver. 1284 */ 1285 lq_sta->missed_rate_counter++; 1286 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1287 lq_sta->missed_rate_counter = 0; 1288 IWL_DEBUG_RATE(mvm, 1289 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1290 lq_sta->rs_state); 1291 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1292 } 1293 /* Regardless, ignore this status info for outdated rate */ 1294 return; 1295 } else 1296 /* Rate did match, so reset the missed_rate_counter */ 1297 lq_sta->missed_rate_counter = 0; 1298 1299 if (!lq_sta->search_better_tbl) { 1300 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1301 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1302 } else { 1303 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1304 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1305 } 1306 1307 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1308 IWL_DEBUG_RATE(mvm, 1309 "Neither active nor search matches tx rate\n"); 1310 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1311 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1312 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1313 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1314 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1315 1316 /* 1317 * no matching table found, let's by-pass the data collection 1318 * and continue to perform rate scale to find the rate table 1319 */ 1320 rs_stay_in_table(lq_sta, true); 1321 goto done; 1322 } 1323 1324 /* 1325 * Updating the frame history depends on whether packets were 1326 * aggregated. 1327 * 1328 * For aggregation, all packets were transmitted at the same rate, the 1329 * first index into rate scale table. 1330 */ 1331 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1332 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1333 info->status.ampdu_len, 1334 info->status.ampdu_ack_len, 1335 reduced_txp); 1336 1337 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1338 * it as a single frame loss as we don't want the success ratio 1339 * to dip too quickly because a BA wasn't received. 1340 * For TPC, there's no need for this optimisation since we want 1341 * to recover very quickly from a bad power reduction and, 1342 * therefore we'd like the success ratio to get an immediate hit 1343 * when failing to get a BA, so we'd switch back to a lower or 1344 * zero power reduction. When FW transmits agg with a rate 1345 * different from the initial rate, it will not use reduced txp 1346 * and will send BA notification twice (one empty with reduced 1347 * txp equal to the value from LQ and one with reduced txp 0). 1348 * We need to update counters for each txp level accordingly. 1349 */ 1350 if (info->status.ampdu_ack_len == 0) 1351 info->status.ampdu_len = 1; 1352 1353 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1354 info->status.ampdu_len, 1355 info->status.ampdu_ack_len); 1356 1357 /* Update success/fail counts if not searching for new mode */ 1358 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1359 lq_sta->total_success += info->status.ampdu_ack_len; 1360 lq_sta->total_failed += (info->status.ampdu_len - 1361 info->status.ampdu_ack_len); 1362 } 1363 } else { 1364 /* For legacy, update frame history with for each Tx retry. */ 1365 retries = info->status.rates[0].count - 1; 1366 /* HW doesn't send more than 15 retries */ 1367 retries = min(retries, 15); 1368 1369 /* The last transmission may have been successful */ 1370 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1371 /* Collect data for each rate used during failed TX attempts */ 1372 for (i = 0; i <= retries; ++i) { 1373 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1374 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1375 &lq_rate); 1376 /* 1377 * Only collect stats if retried rate is in the same RS 1378 * table as active/search. 1379 */ 1380 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1381 tmp_tbl = curr_tbl; 1382 else if (rs_rate_column_match(&lq_rate, 1383 &other_tbl->rate)) 1384 tmp_tbl = other_tbl; 1385 else 1386 continue; 1387 1388 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1389 tx_resp_rate.index, 1, 1390 i < retries ? 0 : legacy_success, 1391 reduced_txp); 1392 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1393 tx_resp_rate.index, 1, 1394 i < retries ? 0 : legacy_success); 1395 } 1396 1397 /* Update success/fail counts if not searching for new mode */ 1398 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1399 lq_sta->total_success += legacy_success; 1400 lq_sta->total_failed += retries + (1 - legacy_success); 1401 } 1402 } 1403 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1404 lq_sta->last_rate_n_flags = lq_hwrate; 1405 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1406 done: 1407 /* See if there's a better rate or modulation mode to try. */ 1408 if (sta->supp_rates[info->band]) 1409 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1410 } 1411 1412 /* 1413 * mac80211 sends us Tx status 1414 */ 1415 static void rs_drv_mac80211_tx_status(void *mvm_r, 1416 struct ieee80211_supported_band *sband, 1417 struct ieee80211_sta *sta, void *priv_sta, 1418 struct sk_buff *skb) 1419 { 1420 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1421 struct iwl_op_mode *op_mode = mvm_r; 1422 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1423 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1424 1425 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1426 return; 1427 1428 if (!ieee80211_is_data(hdr->frame_control) || 1429 info->flags & IEEE80211_TX_CTL_NO_ACK) 1430 return; 1431 1432 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1433 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1434 } 1435 1436 /* 1437 * Begin a period of staying with a selected modulation mode. 1438 * Set "stay_in_tbl" flag to prevent any mode switches. 1439 * Set frame tx success limits according to legacy vs. high-throughput, 1440 * and reset overall (spanning all rates) tx success history statistics. 1441 * These control how long we stay using same modulation mode before 1442 * searching for a new mode. 1443 */ 1444 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1445 struct iwl_lq_sta *lq_sta) 1446 { 1447 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1448 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1449 if (is_legacy) { 1450 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1451 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1452 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1453 } else { 1454 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1455 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1456 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1457 } 1458 lq_sta->table_count = 0; 1459 lq_sta->total_failed = 0; 1460 lq_sta->total_success = 0; 1461 lq_sta->flush_timer = jiffies; 1462 lq_sta->visited_columns = 0; 1463 } 1464 1465 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1466 { 1467 if (rate_mask) 1468 return find_last_bit(&rate_mask, BITS_PER_LONG); 1469 return IWL_RATE_INVALID; 1470 } 1471 1472 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1473 const struct rs_tx_column *column) 1474 { 1475 switch (column->mode) { 1476 case RS_LEGACY: 1477 return lq_sta->max_legacy_rate_idx; 1478 case RS_SISO: 1479 return lq_sta->max_siso_rate_idx; 1480 case RS_MIMO2: 1481 return lq_sta->max_mimo2_rate_idx; 1482 default: 1483 WARN_ON_ONCE(1); 1484 } 1485 1486 return lq_sta->max_legacy_rate_idx; 1487 } 1488 1489 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1490 const struct rs_tx_column *column, 1491 u32 bw) 1492 { 1493 /* Used to choose among HT tables */ 1494 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1495 1496 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1497 column->mode != RS_SISO && 1498 column->mode != RS_MIMO2)) 1499 return expected_tpt_legacy; 1500 1501 /* Legacy rates have only one table */ 1502 if (column->mode == RS_LEGACY) 1503 return expected_tpt_legacy; 1504 1505 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1506 /* Choose among many HT tables depending on number of streams 1507 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1508 * status */ 1509 if (column->mode == RS_SISO) { 1510 switch (bw) { 1511 case RATE_MCS_CHAN_WIDTH_20: 1512 ht_tbl_pointer = expected_tpt_siso_20MHz; 1513 break; 1514 case RATE_MCS_CHAN_WIDTH_40: 1515 ht_tbl_pointer = expected_tpt_siso_40MHz; 1516 break; 1517 case RATE_MCS_CHAN_WIDTH_80: 1518 ht_tbl_pointer = expected_tpt_siso_80MHz; 1519 break; 1520 case RATE_MCS_CHAN_WIDTH_160: 1521 ht_tbl_pointer = expected_tpt_siso_160MHz; 1522 break; 1523 default: 1524 WARN_ON_ONCE(1); 1525 } 1526 } else if (column->mode == RS_MIMO2) { 1527 switch (bw) { 1528 case RATE_MCS_CHAN_WIDTH_20: 1529 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1530 break; 1531 case RATE_MCS_CHAN_WIDTH_40: 1532 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1533 break; 1534 case RATE_MCS_CHAN_WIDTH_80: 1535 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1536 break; 1537 case RATE_MCS_CHAN_WIDTH_160: 1538 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1539 break; 1540 default: 1541 WARN_ON_ONCE(1); 1542 } 1543 } else { 1544 WARN_ON_ONCE(1); 1545 } 1546 1547 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1548 return ht_tbl_pointer[0]; 1549 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1550 return ht_tbl_pointer[1]; 1551 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1552 return ht_tbl_pointer[2]; 1553 else /* AGG+SGI */ 1554 return ht_tbl_pointer[3]; 1555 } 1556 1557 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1558 struct iwl_scale_tbl_info *tbl) 1559 { 1560 struct rs_rate *rate = &tbl->rate; 1561 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1562 1563 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1564 } 1565 1566 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1567 struct iwl_lq_sta *lq_sta, 1568 struct iwl_scale_tbl_info *tbl, /* "search" */ 1569 unsigned long rate_mask, s8 index) 1570 { 1571 struct iwl_scale_tbl_info *active_tbl = 1572 &(lq_sta->lq_info[lq_sta->active_tbl]); 1573 s32 success_ratio = active_tbl->win[index].success_ratio; 1574 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1575 const u16 *tpt_tbl = tbl->expected_tpt; 1576 u16 high_low; 1577 u32 target_tpt; 1578 int rate_idx; 1579 1580 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1581 target_tpt = 100 * expected_current_tpt; 1582 IWL_DEBUG_RATE(mvm, 1583 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1584 success_ratio, target_tpt); 1585 } else { 1586 target_tpt = lq_sta->last_tpt; 1587 IWL_DEBUG_RATE(mvm, 1588 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1589 success_ratio, target_tpt); 1590 } 1591 1592 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1593 1594 while (rate_idx != IWL_RATE_INVALID) { 1595 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1596 break; 1597 1598 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1599 tbl->rate.type); 1600 1601 rate_idx = (high_low >> 8) & 0xff; 1602 } 1603 1604 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1605 rate_idx, target_tpt, 1606 rate_idx != IWL_RATE_INVALID ? 1607 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1608 1609 return rate_idx; 1610 } 1611 1612 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1613 { 1614 switch (sta->bandwidth) { 1615 case IEEE80211_STA_RX_BW_160: 1616 return RATE_MCS_CHAN_WIDTH_160; 1617 case IEEE80211_STA_RX_BW_80: 1618 return RATE_MCS_CHAN_WIDTH_80; 1619 case IEEE80211_STA_RX_BW_40: 1620 return RATE_MCS_CHAN_WIDTH_40; 1621 case IEEE80211_STA_RX_BW_20: 1622 default: 1623 return RATE_MCS_CHAN_WIDTH_20; 1624 } 1625 } 1626 1627 /* 1628 * Check whether we should continue using same modulation mode, or 1629 * begin search for a new mode, based on: 1630 * 1) # tx successes or failures while using this mode 1631 * 2) # times calling this function 1632 * 3) elapsed time in this mode (not used, for now) 1633 */ 1634 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1635 { 1636 struct iwl_scale_tbl_info *tbl; 1637 int active_tbl; 1638 int flush_interval_passed = 0; 1639 struct iwl_mvm *mvm; 1640 1641 mvm = lq_sta->pers.drv; 1642 active_tbl = lq_sta->active_tbl; 1643 1644 tbl = &(lq_sta->lq_info[active_tbl]); 1645 1646 /* If we've been disallowing search, see if we should now allow it */ 1647 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1648 /* Elapsed time using current modulation mode */ 1649 if (lq_sta->flush_timer) 1650 flush_interval_passed = 1651 time_after(jiffies, 1652 (unsigned long)(lq_sta->flush_timer + 1653 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1654 1655 /* 1656 * Check if we should allow search for new modulation mode. 1657 * If many frames have failed or succeeded, or we've used 1658 * this same modulation for a long time, allow search, and 1659 * reset history stats that keep track of whether we should 1660 * allow a new search. Also (below) reset all bitmaps and 1661 * stats in active history. 1662 */ 1663 if (force_search || 1664 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1665 (lq_sta->total_success > lq_sta->max_success_limit) || 1666 ((!lq_sta->search_better_tbl) && 1667 (lq_sta->flush_timer) && (flush_interval_passed))) { 1668 IWL_DEBUG_RATE(mvm, 1669 "LQ: stay is expired %d %d %d\n", 1670 lq_sta->total_failed, 1671 lq_sta->total_success, 1672 flush_interval_passed); 1673 1674 /* Allow search for new mode */ 1675 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1676 IWL_DEBUG_RATE(mvm, 1677 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1678 lq_sta->total_failed = 0; 1679 lq_sta->total_success = 0; 1680 lq_sta->flush_timer = 0; 1681 /* mark the current column as visited */ 1682 lq_sta->visited_columns = BIT(tbl->column); 1683 /* 1684 * Else if we've used this modulation mode enough repetitions 1685 * (regardless of elapsed time or success/failure), reset 1686 * history bitmaps and rate-specific stats for all rates in 1687 * active table. 1688 */ 1689 } else { 1690 lq_sta->table_count++; 1691 if (lq_sta->table_count >= 1692 lq_sta->table_count_limit) { 1693 lq_sta->table_count = 0; 1694 1695 IWL_DEBUG_RATE(mvm, 1696 "LQ: stay in table clear win\n"); 1697 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1698 } 1699 } 1700 1701 /* If transitioning to allow "search", reset all history 1702 * bitmaps and stats in active table (this will become the new 1703 * "search" table). */ 1704 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1705 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1706 } 1707 } 1708 } 1709 1710 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1711 struct iwl_scale_tbl_info *tbl, 1712 enum rs_action scale_action) 1713 { 1714 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1715 1716 /* 1717 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1718 * or 0, since there is no per-TID alg. 1719 */ 1720 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1721 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1722 scale_action == RS_ACTION_DOWNSCALE) 1723 mvmsta->amsdu_enabled = 0; 1724 else 1725 mvmsta->amsdu_enabled = 0xFFFF; 1726 1727 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1728 } 1729 1730 /* 1731 * setup rate table in uCode 1732 */ 1733 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1734 struct ieee80211_sta *sta, 1735 struct iwl_lq_sta *lq_sta, 1736 struct iwl_scale_tbl_info *tbl) 1737 { 1738 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1739 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1740 } 1741 1742 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1743 struct ieee80211_sta *sta, 1744 struct iwl_lq_sta *lq_sta, 1745 struct iwl_scale_tbl_info *tbl, 1746 enum rs_action scale_action) 1747 { 1748 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1749 return false; 1750 1751 if (!is_vht_siso(&tbl->rate)) 1752 return false; 1753 1754 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1755 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1756 (scale_action == RS_ACTION_DOWNSCALE)) { 1757 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1758 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1759 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1760 goto tweaked; 1761 } 1762 1763 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1764 * sustainable, i.e. we're past the test window. We can't go back 1765 * if MCS5 is just tested as this will happen always after switching 1766 * to 20Mhz MCS4 because the rate stats are cleared. 1767 */ 1768 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1769 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1770 (scale_action == RS_ACTION_STAY)) || 1771 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1772 (scale_action == RS_ACTION_UPSCALE)))) { 1773 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1774 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1775 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1776 goto tweaked; 1777 } 1778 1779 return false; 1780 1781 tweaked: 1782 rs_set_expected_tpt_table(lq_sta, tbl); 1783 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1784 return true; 1785 } 1786 1787 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1788 struct iwl_lq_sta *lq_sta, 1789 struct ieee80211_sta *sta, 1790 struct iwl_scale_tbl_info *tbl) 1791 { 1792 int i, j, max_rate; 1793 enum rs_column next_col_id; 1794 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1795 const struct rs_tx_column *next_col; 1796 allow_column_func_t allow_func; 1797 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1798 const u16 *expected_tpt_tbl; 1799 u16 tpt, max_expected_tpt; 1800 1801 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1802 next_col_id = curr_col->next_columns[i]; 1803 1804 if (next_col_id == RS_COLUMN_INVALID) 1805 continue; 1806 1807 if (lq_sta->visited_columns & BIT(next_col_id)) { 1808 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1809 next_col_id); 1810 continue; 1811 } 1812 1813 next_col = &rs_tx_columns[next_col_id]; 1814 1815 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1816 IWL_DEBUG_RATE(mvm, 1817 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1818 next_col_id, valid_ants, next_col->ant); 1819 continue; 1820 } 1821 1822 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1823 allow_func = next_col->checks[j]; 1824 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1825 next_col)) 1826 break; 1827 } 1828 1829 if (j != MAX_COLUMN_CHECKS) { 1830 IWL_DEBUG_RATE(mvm, 1831 "Skip column %d: not allowed (check %d failed)\n", 1832 next_col_id, j); 1833 1834 continue; 1835 } 1836 1837 tpt = lq_sta->last_tpt / 100; 1838 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1839 rs_bw_from_sta_bw(sta)); 1840 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1841 continue; 1842 1843 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1844 if (max_rate == IWL_RATE_INVALID) { 1845 IWL_DEBUG_RATE(mvm, 1846 "Skip column %d: no rate is allowed in this column\n", 1847 next_col_id); 1848 continue; 1849 } 1850 1851 max_expected_tpt = expected_tpt_tbl[max_rate]; 1852 if (tpt >= max_expected_tpt) { 1853 IWL_DEBUG_RATE(mvm, 1854 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1855 next_col_id, max_expected_tpt, tpt); 1856 continue; 1857 } 1858 1859 IWL_DEBUG_RATE(mvm, 1860 "Found potential column %d. Max expected %d current %d\n", 1861 next_col_id, max_expected_tpt, tpt); 1862 break; 1863 } 1864 1865 if (i == MAX_NEXT_COLUMNS) 1866 return RS_COLUMN_INVALID; 1867 1868 return next_col_id; 1869 } 1870 1871 static int rs_switch_to_column(struct iwl_mvm *mvm, 1872 struct iwl_lq_sta *lq_sta, 1873 struct ieee80211_sta *sta, 1874 enum rs_column col_id) 1875 { 1876 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1877 struct iwl_scale_tbl_info *search_tbl = 1878 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1879 struct rs_rate *rate = &search_tbl->rate; 1880 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1881 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1882 unsigned long rate_mask = 0; 1883 u32 rate_idx = 0; 1884 1885 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1886 1887 rate->sgi = column->sgi; 1888 rate->ant = column->ant; 1889 1890 if (column->mode == RS_LEGACY) { 1891 if (lq_sta->band == NL80211_BAND_5GHZ) 1892 rate->type = LQ_LEGACY_A; 1893 else 1894 rate->type = LQ_LEGACY_G; 1895 1896 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1897 rate->ldpc = false; 1898 rate_mask = lq_sta->active_legacy_rate; 1899 } else if (column->mode == RS_SISO) { 1900 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1901 rate_mask = lq_sta->active_siso_rate; 1902 } else if (column->mode == RS_MIMO2) { 1903 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1904 rate_mask = lq_sta->active_mimo2_rate; 1905 } else { 1906 WARN_ONCE(1, "Bad column mode"); 1907 } 1908 1909 if (column->mode != RS_LEGACY) { 1910 rate->bw = rs_bw_from_sta_bw(sta); 1911 rate->ldpc = lq_sta->ldpc; 1912 } 1913 1914 search_tbl->column = col_id; 1915 rs_set_expected_tpt_table(lq_sta, search_tbl); 1916 1917 lq_sta->visited_columns |= BIT(col_id); 1918 1919 /* Get the best matching rate if we're changing modes. e.g. 1920 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1921 */ 1922 if (curr_column->mode != column->mode) { 1923 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1924 rate_mask, rate->index); 1925 1926 if ((rate_idx == IWL_RATE_INVALID) || 1927 !(BIT(rate_idx) & rate_mask)) { 1928 IWL_DEBUG_RATE(mvm, 1929 "can not switch with index %d" 1930 " rate mask %lx\n", 1931 rate_idx, rate_mask); 1932 1933 goto err; 1934 } 1935 1936 rate->index = rate_idx; 1937 } 1938 1939 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1940 col_id, rate->index); 1941 1942 return 0; 1943 1944 err: 1945 rate->type = LQ_NONE; 1946 return -1; 1947 } 1948 1949 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1950 struct iwl_scale_tbl_info *tbl, 1951 s32 sr, int low, int high, 1952 int current_tpt, 1953 int low_tpt, int high_tpt) 1954 { 1955 enum rs_action action = RS_ACTION_STAY; 1956 1957 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1958 (current_tpt == 0)) { 1959 IWL_DEBUG_RATE(mvm, 1960 "Decrease rate because of low SR\n"); 1961 return RS_ACTION_DOWNSCALE; 1962 } 1963 1964 if ((low_tpt == IWL_INVALID_VALUE) && 1965 (high_tpt == IWL_INVALID_VALUE) && 1966 (high != IWL_RATE_INVALID)) { 1967 IWL_DEBUG_RATE(mvm, 1968 "No data about high/low rates. Increase rate\n"); 1969 return RS_ACTION_UPSCALE; 1970 } 1971 1972 if ((high_tpt == IWL_INVALID_VALUE) && 1973 (high != IWL_RATE_INVALID) && 1974 (low_tpt != IWL_INVALID_VALUE) && 1975 (low_tpt < current_tpt)) { 1976 IWL_DEBUG_RATE(mvm, 1977 "No data about high rate and low rate is worse. Increase rate\n"); 1978 return RS_ACTION_UPSCALE; 1979 } 1980 1981 if ((high_tpt != IWL_INVALID_VALUE) && 1982 (high_tpt > current_tpt)) { 1983 IWL_DEBUG_RATE(mvm, 1984 "Higher rate is better. Increate rate\n"); 1985 return RS_ACTION_UPSCALE; 1986 } 1987 1988 if ((low_tpt != IWL_INVALID_VALUE) && 1989 (high_tpt != IWL_INVALID_VALUE) && 1990 (low_tpt < current_tpt) && 1991 (high_tpt < current_tpt)) { 1992 IWL_DEBUG_RATE(mvm, 1993 "Both high and low are worse. Maintain rate\n"); 1994 return RS_ACTION_STAY; 1995 } 1996 1997 if ((low_tpt != IWL_INVALID_VALUE) && 1998 (low_tpt > current_tpt)) { 1999 IWL_DEBUG_RATE(mvm, 2000 "Lower rate is better\n"); 2001 action = RS_ACTION_DOWNSCALE; 2002 goto out; 2003 } 2004 2005 if ((low_tpt == IWL_INVALID_VALUE) && 2006 (low != IWL_RATE_INVALID)) { 2007 IWL_DEBUG_RATE(mvm, 2008 "No data about lower rate\n"); 2009 action = RS_ACTION_DOWNSCALE; 2010 goto out; 2011 } 2012 2013 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2014 2015 out: 2016 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2017 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2018 IWL_DEBUG_RATE(mvm, 2019 "SR is above NO DECREASE. Avoid downscale\n"); 2020 action = RS_ACTION_STAY; 2021 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2022 IWL_DEBUG_RATE(mvm, 2023 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2024 action = RS_ACTION_STAY; 2025 } else { 2026 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2027 } 2028 } 2029 2030 return action; 2031 } 2032 2033 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2034 struct iwl_lq_sta *lq_sta) 2035 { 2036 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2037 * supports STBC of at least 1*SS 2038 */ 2039 if (!lq_sta->stbc_capable) 2040 return false; 2041 2042 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2043 return false; 2044 2045 return true; 2046 } 2047 2048 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2049 int *weaker, int *stronger) 2050 { 2051 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2052 if (*weaker > TPC_MAX_REDUCTION) 2053 *weaker = TPC_INVALID; 2054 2055 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2056 if (*stronger < 0) 2057 *stronger = TPC_INVALID; 2058 } 2059 2060 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2061 struct rs_rate *rate, enum nl80211_band band) 2062 { 2063 int index = rate->index; 2064 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2065 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2066 !vif->bss_conf.ps); 2067 2068 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2069 cam, sta_ps_disabled); 2070 /* 2071 * allow tpc only if power management is enabled, or bt coex 2072 * activity grade allows it and we are on 2.4Ghz. 2073 */ 2074 if ((cam || sta_ps_disabled) && 2075 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2076 return false; 2077 2078 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2079 if (is_legacy(rate)) 2080 return index == IWL_RATE_54M_INDEX; 2081 if (is_ht(rate)) 2082 return index == IWL_RATE_MCS_7_INDEX; 2083 if (is_vht(rate)) 2084 return index == IWL_RATE_MCS_7_INDEX || 2085 index == IWL_RATE_MCS_8_INDEX || 2086 index == IWL_RATE_MCS_9_INDEX; 2087 2088 WARN_ON_ONCE(1); 2089 return false; 2090 } 2091 2092 enum tpc_action { 2093 TPC_ACTION_STAY, 2094 TPC_ACTION_DECREASE, 2095 TPC_ACTION_INCREASE, 2096 TPC_ACTION_NO_RESTIRCTION, 2097 }; 2098 2099 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2100 s32 sr, int weak, int strong, 2101 int current_tpt, 2102 int weak_tpt, int strong_tpt) 2103 { 2104 /* stay until we have valid tpt */ 2105 if (current_tpt == IWL_INVALID_VALUE) { 2106 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2107 return TPC_ACTION_STAY; 2108 } 2109 2110 /* Too many failures, increase txp */ 2111 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2112 current_tpt == 0) { 2113 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2114 return TPC_ACTION_NO_RESTIRCTION; 2115 } 2116 2117 /* try decreasing first if applicable */ 2118 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2119 weak != TPC_INVALID) { 2120 if (weak_tpt == IWL_INVALID_VALUE && 2121 (strong_tpt == IWL_INVALID_VALUE || 2122 current_tpt >= strong_tpt)) { 2123 IWL_DEBUG_RATE(mvm, 2124 "no weak txp measurement. decrease txp\n"); 2125 return TPC_ACTION_DECREASE; 2126 } 2127 2128 if (weak_tpt > current_tpt) { 2129 IWL_DEBUG_RATE(mvm, 2130 "lower txp has better tpt. decrease txp\n"); 2131 return TPC_ACTION_DECREASE; 2132 } 2133 } 2134 2135 /* next, increase if needed */ 2136 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2137 strong != TPC_INVALID) { 2138 if (weak_tpt == IWL_INVALID_VALUE && 2139 strong_tpt != IWL_INVALID_VALUE && 2140 current_tpt < strong_tpt) { 2141 IWL_DEBUG_RATE(mvm, 2142 "higher txp has better tpt. increase txp\n"); 2143 return TPC_ACTION_INCREASE; 2144 } 2145 2146 if (weak_tpt < current_tpt && 2147 (strong_tpt == IWL_INVALID_VALUE || 2148 strong_tpt > current_tpt)) { 2149 IWL_DEBUG_RATE(mvm, 2150 "lower txp has worse tpt. increase txp\n"); 2151 return TPC_ACTION_INCREASE; 2152 } 2153 } 2154 2155 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2156 return TPC_ACTION_STAY; 2157 } 2158 2159 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2160 struct ieee80211_sta *sta, 2161 struct iwl_lq_sta *lq_sta, 2162 struct iwl_scale_tbl_info *tbl) 2163 { 2164 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2165 struct ieee80211_vif *vif = mvm_sta->vif; 2166 struct ieee80211_chanctx_conf *chanctx_conf; 2167 enum nl80211_band band; 2168 struct iwl_rate_scale_data *window; 2169 struct rs_rate *rate = &tbl->rate; 2170 enum tpc_action action; 2171 s32 sr; 2172 u8 cur = lq_sta->lq.reduced_tpc; 2173 int current_tpt; 2174 int weak, strong; 2175 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2176 2177 #ifdef CONFIG_MAC80211_DEBUGFS 2178 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2179 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2180 lq_sta->pers.dbg_fixed_txp_reduction); 2181 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2182 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2183 } 2184 #endif 2185 2186 rcu_read_lock(); 2187 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2188 if (WARN_ON(!chanctx_conf)) 2189 band = NUM_NL80211_BANDS; 2190 else 2191 band = chanctx_conf->def.chan->band; 2192 rcu_read_unlock(); 2193 2194 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2195 IWL_DEBUG_RATE(mvm, 2196 "tpc is not allowed. remove txp restrictions\n"); 2197 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2198 return cur != TPC_NO_REDUCTION; 2199 } 2200 2201 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2202 2203 /* Collect measured throughputs for current and adjacent rates */ 2204 window = tbl->tpc_win; 2205 sr = window[cur].success_ratio; 2206 current_tpt = window[cur].average_tpt; 2207 if (weak != TPC_INVALID) 2208 weak_tpt = window[weak].average_tpt; 2209 if (strong != TPC_INVALID) 2210 strong_tpt = window[strong].average_tpt; 2211 2212 IWL_DEBUG_RATE(mvm, 2213 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2214 cur, current_tpt, sr, weak, strong, 2215 weak_tpt, strong_tpt); 2216 2217 action = rs_get_tpc_action(mvm, sr, weak, strong, 2218 current_tpt, weak_tpt, strong_tpt); 2219 2220 /* override actions if we are on the edge */ 2221 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2222 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2223 action = TPC_ACTION_STAY; 2224 } else if (strong == TPC_INVALID && 2225 (action == TPC_ACTION_INCREASE || 2226 action == TPC_ACTION_NO_RESTIRCTION)) { 2227 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2228 action = TPC_ACTION_STAY; 2229 } 2230 2231 switch (action) { 2232 case TPC_ACTION_DECREASE: 2233 lq_sta->lq.reduced_tpc = weak; 2234 return true; 2235 case TPC_ACTION_INCREASE: 2236 lq_sta->lq.reduced_tpc = strong; 2237 return true; 2238 case TPC_ACTION_NO_RESTIRCTION: 2239 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2240 return true; 2241 case TPC_ACTION_STAY: 2242 /* do nothing */ 2243 break; 2244 } 2245 return false; 2246 } 2247 2248 /* 2249 * Do rate scaling and search for new modulation mode. 2250 */ 2251 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2252 struct ieee80211_sta *sta, 2253 struct iwl_lq_sta *lq_sta, 2254 int tid, bool ndp) 2255 { 2256 int low = IWL_RATE_INVALID; 2257 int high = IWL_RATE_INVALID; 2258 int index; 2259 struct iwl_rate_scale_data *window = NULL; 2260 int current_tpt = IWL_INVALID_VALUE; 2261 int low_tpt = IWL_INVALID_VALUE; 2262 int high_tpt = IWL_INVALID_VALUE; 2263 u32 fail_count; 2264 enum rs_action scale_action = RS_ACTION_STAY; 2265 u16 rate_mask; 2266 u8 update_lq = 0; 2267 struct iwl_scale_tbl_info *tbl, *tbl1; 2268 u8 active_tbl = 0; 2269 u8 done_search = 0; 2270 u16 high_low; 2271 s32 sr; 2272 u8 prev_agg = lq_sta->is_agg; 2273 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2274 struct rs_rate *rate; 2275 2276 lq_sta->is_agg = !!mvmsta->agg_tids; 2277 2278 /* 2279 * Select rate-scale / modulation-mode table to work with in 2280 * the rest of this function: "search" if searching for better 2281 * modulation mode, or "active" if doing rate scaling within a mode. 2282 */ 2283 if (!lq_sta->search_better_tbl) 2284 active_tbl = lq_sta->active_tbl; 2285 else 2286 active_tbl = 1 - lq_sta->active_tbl; 2287 2288 tbl = &(lq_sta->lq_info[active_tbl]); 2289 rate = &tbl->rate; 2290 2291 if (prev_agg != lq_sta->is_agg) { 2292 IWL_DEBUG_RATE(mvm, 2293 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2294 prev_agg, lq_sta->is_agg); 2295 rs_set_expected_tpt_table(lq_sta, tbl); 2296 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2297 } 2298 2299 /* current tx rate */ 2300 index = rate->index; 2301 2302 /* rates available for this association, and for modulation mode */ 2303 rate_mask = rs_get_supported_rates(lq_sta, rate); 2304 2305 if (!(BIT(index) & rate_mask)) { 2306 IWL_ERR(mvm, "Current Rate is not valid\n"); 2307 if (lq_sta->search_better_tbl) { 2308 /* revert to active table if search table is not valid*/ 2309 rate->type = LQ_NONE; 2310 lq_sta->search_better_tbl = 0; 2311 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2312 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2313 } 2314 return; 2315 } 2316 2317 /* Get expected throughput table and history window for current rate */ 2318 if (!tbl->expected_tpt) { 2319 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2320 return; 2321 } 2322 2323 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2324 window = &(tbl->win[index]); 2325 2326 /* 2327 * If there is not enough history to calculate actual average 2328 * throughput, keep analyzing results of more tx frames, without 2329 * changing rate or mode (bypass most of the rest of this function). 2330 * Set up new rate table in uCode only if old rate is not supported 2331 * in current association (use new rate found above). 2332 */ 2333 fail_count = window->counter - window->success_counter; 2334 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2335 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2336 IWL_DEBUG_RATE(mvm, 2337 "%s: Test Window: succ %d total %d\n", 2338 rs_pretty_rate(rate), 2339 window->success_counter, window->counter); 2340 2341 /* Can't calculate this yet; not enough history */ 2342 window->average_tpt = IWL_INVALID_VALUE; 2343 2344 /* Should we stay with this modulation mode, 2345 * or search for a new one? */ 2346 rs_stay_in_table(lq_sta, false); 2347 2348 return; 2349 } 2350 2351 /* If we are searching for better modulation mode, check success. */ 2352 if (lq_sta->search_better_tbl) { 2353 /* If good success, continue using the "search" mode; 2354 * no need to send new link quality command, since we're 2355 * continuing to use the setup that we've been trying. */ 2356 if (window->average_tpt > lq_sta->last_tpt) { 2357 IWL_DEBUG_RATE(mvm, 2358 "SWITCHING TO NEW TABLE SR: %d " 2359 "cur-tpt %d old-tpt %d\n", 2360 window->success_ratio, 2361 window->average_tpt, 2362 lq_sta->last_tpt); 2363 2364 /* Swap tables; "search" becomes "active" */ 2365 lq_sta->active_tbl = active_tbl; 2366 current_tpt = window->average_tpt; 2367 /* Else poor success; go back to mode in "active" table */ 2368 } else { 2369 IWL_DEBUG_RATE(mvm, 2370 "GOING BACK TO THE OLD TABLE: SR %d " 2371 "cur-tpt %d old-tpt %d\n", 2372 window->success_ratio, 2373 window->average_tpt, 2374 lq_sta->last_tpt); 2375 2376 /* Nullify "search" table */ 2377 rate->type = LQ_NONE; 2378 2379 /* Revert to "active" table */ 2380 active_tbl = lq_sta->active_tbl; 2381 tbl = &(lq_sta->lq_info[active_tbl]); 2382 2383 /* Revert to "active" rate and throughput info */ 2384 index = tbl->rate.index; 2385 current_tpt = lq_sta->last_tpt; 2386 2387 /* Need to set up a new rate table in uCode */ 2388 update_lq = 1; 2389 } 2390 2391 /* Either way, we've made a decision; modulation mode 2392 * search is done, allow rate adjustment next time. */ 2393 lq_sta->search_better_tbl = 0; 2394 done_search = 1; /* Don't switch modes below! */ 2395 goto lq_update; 2396 } 2397 2398 /* (Else) not in search of better modulation mode, try for better 2399 * starting rate, while staying in this mode. */ 2400 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2401 low = high_low & 0xff; 2402 high = (high_low >> 8) & 0xff; 2403 2404 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2405 2406 sr = window->success_ratio; 2407 2408 /* Collect measured throughputs for current and adjacent rates */ 2409 current_tpt = window->average_tpt; 2410 if (low != IWL_RATE_INVALID) 2411 low_tpt = tbl->win[low].average_tpt; 2412 if (high != IWL_RATE_INVALID) 2413 high_tpt = tbl->win[high].average_tpt; 2414 2415 IWL_DEBUG_RATE(mvm, 2416 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2417 rs_pretty_rate(rate), current_tpt, sr, 2418 low, high, low_tpt, high_tpt); 2419 2420 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2421 current_tpt, low_tpt, high_tpt); 2422 2423 /* Force a search in case BT doesn't like us being in MIMO */ 2424 if (is_mimo(rate) && 2425 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2426 IWL_DEBUG_RATE(mvm, 2427 "BT Coex forbids MIMO. Search for new config\n"); 2428 rs_stay_in_table(lq_sta, true); 2429 goto lq_update; 2430 } 2431 2432 switch (scale_action) { 2433 case RS_ACTION_DOWNSCALE: 2434 /* Decrease starting rate, update uCode's rate table */ 2435 if (low != IWL_RATE_INVALID) { 2436 update_lq = 1; 2437 index = low; 2438 } else { 2439 IWL_DEBUG_RATE(mvm, 2440 "At the bottom rate. Can't decrease\n"); 2441 } 2442 2443 break; 2444 case RS_ACTION_UPSCALE: 2445 /* Increase starting rate, update uCode's rate table */ 2446 if (high != IWL_RATE_INVALID) { 2447 update_lq = 1; 2448 index = high; 2449 } else { 2450 IWL_DEBUG_RATE(mvm, 2451 "At the top rate. Can't increase\n"); 2452 } 2453 2454 break; 2455 case RS_ACTION_STAY: 2456 /* No change */ 2457 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2458 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2459 break; 2460 default: 2461 break; 2462 } 2463 2464 lq_update: 2465 /* Replace uCode's rate table for the destination station. */ 2466 if (update_lq) { 2467 tbl->rate.index = index; 2468 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2469 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2470 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2471 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2472 } 2473 2474 rs_stay_in_table(lq_sta, false); 2475 2476 /* 2477 * Search for new modulation mode if we're: 2478 * 1) Not changing rates right now 2479 * 2) Not just finishing up a search 2480 * 3) Allowing a new search 2481 */ 2482 if (!update_lq && !done_search && 2483 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2484 && window->counter) { 2485 enum rs_column next_column; 2486 2487 /* Save current throughput to compare with "search" throughput*/ 2488 lq_sta->last_tpt = current_tpt; 2489 2490 IWL_DEBUG_RATE(mvm, 2491 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2492 update_lq, done_search, lq_sta->rs_state, 2493 window->counter); 2494 2495 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2496 if (next_column != RS_COLUMN_INVALID) { 2497 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2498 next_column); 2499 if (!ret) 2500 lq_sta->search_better_tbl = 1; 2501 } else { 2502 IWL_DEBUG_RATE(mvm, 2503 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2504 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2505 } 2506 2507 /* If new "search" mode was selected, set up in uCode table */ 2508 if (lq_sta->search_better_tbl) { 2509 /* Access the "search" table, clear its history. */ 2510 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2511 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2512 2513 /* Use new "search" start rate */ 2514 index = tbl->rate.index; 2515 2516 rs_dump_rate(mvm, &tbl->rate, 2517 "Switch to SEARCH TABLE:"); 2518 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2519 } else { 2520 done_search = 1; 2521 } 2522 } 2523 2524 if (!ndp) 2525 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2526 2527 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2528 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2529 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2530 } 2531 } 2532 2533 struct rs_init_rate_info { 2534 s8 rssi; 2535 u8 rate_idx; 2536 }; 2537 2538 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2539 { -60, IWL_RATE_54M_INDEX }, 2540 { -64, IWL_RATE_48M_INDEX }, 2541 { -68, IWL_RATE_36M_INDEX }, 2542 { -80, IWL_RATE_24M_INDEX }, 2543 { -84, IWL_RATE_18M_INDEX }, 2544 { -85, IWL_RATE_12M_INDEX }, 2545 { -86, IWL_RATE_11M_INDEX }, 2546 { -88, IWL_RATE_5M_INDEX }, 2547 { -90, IWL_RATE_2M_INDEX }, 2548 { S8_MIN, IWL_RATE_1M_INDEX }, 2549 }; 2550 2551 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2552 { -60, IWL_RATE_54M_INDEX }, 2553 { -64, IWL_RATE_48M_INDEX }, 2554 { -72, IWL_RATE_36M_INDEX }, 2555 { -80, IWL_RATE_24M_INDEX }, 2556 { -84, IWL_RATE_18M_INDEX }, 2557 { -85, IWL_RATE_12M_INDEX }, 2558 { -87, IWL_RATE_9M_INDEX }, 2559 { S8_MIN, IWL_RATE_6M_INDEX }, 2560 }; 2561 2562 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2563 { -60, IWL_RATE_MCS_7_INDEX }, 2564 { -64, IWL_RATE_MCS_6_INDEX }, 2565 { -68, IWL_RATE_MCS_5_INDEX }, 2566 { -72, IWL_RATE_MCS_4_INDEX }, 2567 { -80, IWL_RATE_MCS_3_INDEX }, 2568 { -84, IWL_RATE_MCS_2_INDEX }, 2569 { -85, IWL_RATE_MCS_1_INDEX }, 2570 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2571 }; 2572 2573 /* MCS index 9 is not valid for 20MHz VHT channel width, 2574 * but is ok for 40, 80 and 160MHz channels. 2575 */ 2576 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2577 { -60, IWL_RATE_MCS_8_INDEX }, 2578 { -64, IWL_RATE_MCS_7_INDEX }, 2579 { -68, IWL_RATE_MCS_6_INDEX }, 2580 { -72, IWL_RATE_MCS_5_INDEX }, 2581 { -80, IWL_RATE_MCS_4_INDEX }, 2582 { -84, IWL_RATE_MCS_3_INDEX }, 2583 { -85, IWL_RATE_MCS_2_INDEX }, 2584 { -87, IWL_RATE_MCS_1_INDEX }, 2585 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2586 }; 2587 2588 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2589 { -60, IWL_RATE_MCS_9_INDEX }, 2590 { -64, IWL_RATE_MCS_8_INDEX }, 2591 { -68, IWL_RATE_MCS_7_INDEX }, 2592 { -72, IWL_RATE_MCS_6_INDEX }, 2593 { -80, IWL_RATE_MCS_5_INDEX }, 2594 { -84, IWL_RATE_MCS_4_INDEX }, 2595 { -85, IWL_RATE_MCS_3_INDEX }, 2596 { -87, IWL_RATE_MCS_2_INDEX }, 2597 { -88, IWL_RATE_MCS_1_INDEX }, 2598 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2599 }; 2600 2601 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2602 2603 /* Init the optimal rate based on STA caps 2604 * This combined with rssi is used to report the last tx rate 2605 * to userspace when we haven't transmitted enough frames. 2606 */ 2607 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2608 struct ieee80211_sta *sta, 2609 struct iwl_lq_sta *lq_sta) 2610 { 2611 struct rs_rate *rate = &lq_sta->optimal_rate; 2612 2613 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2614 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2615 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2616 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2617 else if (lq_sta->band == NL80211_BAND_5GHZ) 2618 rate->type = LQ_LEGACY_A; 2619 else 2620 rate->type = LQ_LEGACY_G; 2621 2622 rate->bw = rs_bw_from_sta_bw(sta); 2623 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2624 2625 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2626 2627 if (is_mimo(rate)) { 2628 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2629 } else if (is_siso(rate)) { 2630 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2631 } else { 2632 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2633 2634 if (lq_sta->band == NL80211_BAND_5GHZ) { 2635 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2636 lq_sta->optimal_nentries = 2637 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2638 } else { 2639 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2640 lq_sta->optimal_nentries = 2641 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2642 } 2643 } 2644 2645 if (is_vht(rate)) { 2646 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2647 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2648 lq_sta->optimal_nentries = 2649 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2650 } else { 2651 lq_sta->optimal_rates = rs_optimal_rates_vht; 2652 lq_sta->optimal_nentries = 2653 ARRAY_SIZE(rs_optimal_rates_vht); 2654 } 2655 } else if (is_ht(rate)) { 2656 lq_sta->optimal_rates = rs_optimal_rates_ht; 2657 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2658 } 2659 } 2660 2661 /* Compute the optimal rate index based on RSSI */ 2662 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2663 struct iwl_lq_sta *lq_sta) 2664 { 2665 struct rs_rate *rate = &lq_sta->optimal_rate; 2666 int i; 2667 2668 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2669 BITS_PER_LONG); 2670 2671 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2672 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2673 2674 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2675 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2676 rate->index = rate_idx; 2677 break; 2678 } 2679 } 2680 2681 return rate; 2682 } 2683 2684 /* Choose an initial legacy rate and antenna to use based on the RSSI 2685 * of last Rx 2686 */ 2687 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2688 struct ieee80211_sta *sta, 2689 struct iwl_lq_sta *lq_sta, 2690 enum nl80211_band band, 2691 struct rs_rate *rate) 2692 { 2693 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2694 int i, nentries; 2695 unsigned long active_rate; 2696 s8 best_rssi = S8_MIN; 2697 u8 best_ant = ANT_NONE; 2698 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2699 const struct rs_init_rate_info *initial_rates; 2700 2701 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2702 if (!(lq_sta->pers.chains & BIT(i))) 2703 continue; 2704 2705 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2706 best_rssi = lq_sta->pers.chain_signal[i]; 2707 best_ant = BIT(i); 2708 } 2709 } 2710 2711 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2712 rs_pretty_ant(best_ant), best_rssi); 2713 2714 if (best_ant != ANT_A && best_ant != ANT_B) 2715 rate->ant = first_antenna(valid_tx_ant); 2716 else 2717 rate->ant = best_ant; 2718 2719 rate->sgi = false; 2720 rate->ldpc = false; 2721 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2722 2723 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2724 BITS_PER_LONG); 2725 2726 if (band == NL80211_BAND_5GHZ) { 2727 rate->type = LQ_LEGACY_A; 2728 initial_rates = rs_optimal_rates_5ghz_legacy; 2729 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2730 } else { 2731 rate->type = LQ_LEGACY_G; 2732 initial_rates = rs_optimal_rates_24ghz_legacy; 2733 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2734 } 2735 2736 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2737 goto out; 2738 2739 /* Start from a higher rate if the corresponding debug capability 2740 * is enabled. The rate is chosen according to AP capabilities. 2741 * In case of VHT/HT when the rssi is low fallback to the case of 2742 * legacy rates. 2743 */ 2744 if (sta->vht_cap.vht_supported && 2745 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2746 /* 2747 * In AP mode, when a new station associates, rs is initialized 2748 * immediately upon association completion, before the phy 2749 * context is updated with the association parameters, so the 2750 * sta bandwidth might be wider than the phy context allows. 2751 * To avoid this issue, always initialize rs with 20mhz 2752 * bandwidth rate, and after authorization, when the phy context 2753 * is already up-to-date, re-init rs with the correct bw. 2754 */ 2755 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2756 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2757 2758 switch (bw) { 2759 case RATE_MCS_CHAN_WIDTH_40: 2760 case RATE_MCS_CHAN_WIDTH_80: 2761 case RATE_MCS_CHAN_WIDTH_160: 2762 initial_rates = rs_optimal_rates_vht; 2763 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2764 break; 2765 case RATE_MCS_CHAN_WIDTH_20: 2766 initial_rates = rs_optimal_rates_vht_20mhz; 2767 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2768 break; 2769 default: 2770 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2771 goto out; 2772 } 2773 2774 active_rate = lq_sta->active_siso_rate; 2775 rate->type = LQ_VHT_SISO; 2776 rate->bw = bw; 2777 } else if (sta->ht_cap.ht_supported && 2778 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2779 initial_rates = rs_optimal_rates_ht; 2780 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2781 active_rate = lq_sta->active_siso_rate; 2782 rate->type = LQ_HT_SISO; 2783 } else { 2784 active_rate = lq_sta->active_legacy_rate; 2785 } 2786 2787 for (i = 0; i < nentries; i++) { 2788 int rate_idx = initial_rates[i].rate_idx; 2789 2790 if ((best_rssi >= initial_rates[i].rssi) && 2791 (BIT(rate_idx) & active_rate)) { 2792 rate->index = rate_idx; 2793 break; 2794 } 2795 } 2796 2797 out: 2798 rs_dump_rate(mvm, rate, "INITIAL"); 2799 } 2800 2801 /* Save info about RSSI of last Rx */ 2802 void rs_update_last_rssi(struct iwl_mvm *mvm, 2803 struct iwl_mvm_sta *mvmsta, 2804 struct ieee80211_rx_status *rx_status) 2805 { 2806 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2807 int i; 2808 2809 lq_sta->pers.chains = rx_status->chains; 2810 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2811 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2812 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2813 lq_sta->pers.last_rssi = S8_MIN; 2814 2815 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2816 if (!(lq_sta->pers.chains & BIT(i))) 2817 continue; 2818 2819 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2820 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2821 } 2822 } 2823 2824 /** 2825 * rs_initialize_lq - Initialize a station's hardware rate table 2826 * 2827 * The uCode's station table contains a table of fallback rates 2828 * for automatic fallback during transmission. 2829 * 2830 * NOTE: This sets up a default set of values. These will be replaced later 2831 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2832 * rc80211_simple. 2833 * 2834 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2835 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2836 * which requires station table entry to exist). 2837 */ 2838 static void rs_initialize_lq(struct iwl_mvm *mvm, 2839 struct ieee80211_sta *sta, 2840 struct iwl_lq_sta *lq_sta, 2841 enum nl80211_band band) 2842 { 2843 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2844 struct iwl_scale_tbl_info *tbl; 2845 struct rs_rate *rate; 2846 u8 active_tbl = 0; 2847 2848 if (!sta || !lq_sta) 2849 return; 2850 2851 if (!lq_sta->search_better_tbl) 2852 active_tbl = lq_sta->active_tbl; 2853 else 2854 active_tbl = 1 - lq_sta->active_tbl; 2855 2856 tbl = &(lq_sta->lq_info[active_tbl]); 2857 rate = &tbl->rate; 2858 2859 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2860 rs_init_optimal_rate(mvm, sta, lq_sta); 2861 2862 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2863 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2864 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2865 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2866 2867 tbl->column = rs_get_column_from_rate(rate); 2868 2869 rs_set_expected_tpt_table(lq_sta, tbl); 2870 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2871 /* TODO restore station should remember the lq cmd */ 2872 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, 2873 mvmsta->sta_state < IEEE80211_STA_AUTHORIZED); 2874 } 2875 2876 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2877 void *mvm_sta, 2878 struct ieee80211_tx_rate_control *txrc) 2879 { 2880 struct iwl_op_mode *op_mode = mvm_r; 2881 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2882 struct sk_buff *skb = txrc->skb; 2883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2884 struct iwl_lq_sta *lq_sta; 2885 struct rs_rate *optimal_rate; 2886 u32 last_ucode_rate; 2887 2888 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2889 /* if vif isn't initialized mvm doesn't know about 2890 * this station, so don't do anything with the it 2891 */ 2892 sta = NULL; 2893 mvm_sta = NULL; 2894 } 2895 2896 /* Send management frames and NO_ACK data using lowest rate. */ 2897 if (rate_control_send_low(sta, mvm_sta, txrc)) 2898 return; 2899 2900 if (!mvm_sta) 2901 return; 2902 2903 lq_sta = mvm_sta; 2904 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2905 info->band, &info->control.rates[0]); 2906 info->control.rates[0].count = 1; 2907 2908 /* Report the optimal rate based on rssi and STA caps if we haven't 2909 * converged yet (too little traffic) or exploring other modulations 2910 */ 2911 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2912 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2913 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2914 optimal_rate); 2915 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2916 &txrc->reported_rate); 2917 } 2918 } 2919 2920 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2921 gfp_t gfp) 2922 { 2923 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2924 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2925 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2926 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2927 2928 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2929 2930 lq_sta->pers.drv = mvm; 2931 #ifdef CONFIG_MAC80211_DEBUGFS 2932 lq_sta->pers.dbg_fixed_rate = 0; 2933 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2934 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2935 #endif 2936 lq_sta->pers.chains = 0; 2937 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2938 lq_sta->pers.last_rssi = S8_MIN; 2939 2940 return lq_sta; 2941 } 2942 2943 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2944 int nss) 2945 { 2946 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2947 (0x3 << (2 * (nss - 1))); 2948 rx_mcs >>= (2 * (nss - 1)); 2949 2950 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2951 return IWL_RATE_MCS_7_INDEX; 2952 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2953 return IWL_RATE_MCS_8_INDEX; 2954 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2955 return IWL_RATE_MCS_9_INDEX; 2956 2957 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2958 return -1; 2959 } 2960 2961 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2962 struct ieee80211_sta_vht_cap *vht_cap, 2963 struct iwl_lq_sta *lq_sta) 2964 { 2965 int i; 2966 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2967 2968 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2969 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2970 if (i == IWL_RATE_9M_INDEX) 2971 continue; 2972 2973 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2974 if (i == IWL_RATE_MCS_9_INDEX && 2975 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2976 continue; 2977 2978 lq_sta->active_siso_rate |= BIT(i); 2979 } 2980 } 2981 2982 if (sta->rx_nss < 2) 2983 return; 2984 2985 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2986 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2987 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2988 if (i == IWL_RATE_9M_INDEX) 2989 continue; 2990 2991 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2992 if (i == IWL_RATE_MCS_9_INDEX && 2993 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2994 continue; 2995 2996 lq_sta->active_mimo2_rate |= BIT(i); 2997 } 2998 } 2999 } 3000 3001 static void rs_ht_init(struct iwl_mvm *mvm, 3002 struct ieee80211_sta *sta, 3003 struct iwl_lq_sta *lq_sta, 3004 struct ieee80211_sta_ht_cap *ht_cap) 3005 { 3006 /* active_siso_rate mask includes 9 MBits (bit 5), 3007 * and CCK (bits 0-3), supp_rates[] does not; 3008 * shift to convert format, force 9 MBits off. 3009 */ 3010 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3011 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3012 lq_sta->active_siso_rate &= ~((u16)0x2); 3013 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3014 3015 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3016 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3017 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3018 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3019 3020 if (mvm->cfg->ht_params->ldpc && 3021 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3022 lq_sta->ldpc = true; 3023 3024 if (mvm->cfg->ht_params->stbc && 3025 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3026 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3027 lq_sta->stbc_capable = true; 3028 3029 lq_sta->is_vht = false; 3030 } 3031 3032 static void rs_vht_init(struct iwl_mvm *mvm, 3033 struct ieee80211_sta *sta, 3034 struct iwl_lq_sta *lq_sta, 3035 struct ieee80211_sta_vht_cap *vht_cap) 3036 { 3037 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3038 3039 if (mvm->cfg->ht_params->ldpc && 3040 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3041 lq_sta->ldpc = true; 3042 3043 if (mvm->cfg->ht_params->stbc && 3044 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3045 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3046 lq_sta->stbc_capable = true; 3047 3048 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3049 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3050 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3051 lq_sta->bfer_capable = true; 3052 3053 lq_sta->is_vht = true; 3054 } 3055 3056 #ifdef CONFIG_IWLWIFI_DEBUGFS 3057 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3058 { 3059 spin_lock_bh(&mvm->drv_stats_lock); 3060 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3061 spin_unlock_bh(&mvm->drv_stats_lock); 3062 } 3063 3064 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3065 { 3066 u8 nss = 0; 3067 3068 spin_lock(&mvm->drv_stats_lock); 3069 3070 if (agg) 3071 mvm->drv_rx_stats.agg_frames++; 3072 3073 mvm->drv_rx_stats.success_frames++; 3074 3075 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3076 case RATE_MCS_CHAN_WIDTH_20: 3077 mvm->drv_rx_stats.bw_20_frames++; 3078 break; 3079 case RATE_MCS_CHAN_WIDTH_40: 3080 mvm->drv_rx_stats.bw_40_frames++; 3081 break; 3082 case RATE_MCS_CHAN_WIDTH_80: 3083 mvm->drv_rx_stats.bw_80_frames++; 3084 break; 3085 case RATE_MCS_CHAN_WIDTH_160: 3086 mvm->drv_rx_stats.bw_160_frames++; 3087 break; 3088 default: 3089 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3090 } 3091 3092 if (rate & RATE_MCS_HT_MSK) { 3093 mvm->drv_rx_stats.ht_frames++; 3094 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3095 } else if (rate & RATE_MCS_VHT_MSK) { 3096 mvm->drv_rx_stats.vht_frames++; 3097 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3098 RATE_VHT_MCS_NSS_POS) + 1; 3099 } else { 3100 mvm->drv_rx_stats.legacy_frames++; 3101 } 3102 3103 if (nss == 1) 3104 mvm->drv_rx_stats.siso_frames++; 3105 else if (nss == 2) 3106 mvm->drv_rx_stats.mimo2_frames++; 3107 3108 if (rate & RATE_MCS_SGI_MSK) 3109 mvm->drv_rx_stats.sgi_frames++; 3110 else 3111 mvm->drv_rx_stats.ngi_frames++; 3112 3113 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3114 mvm->drv_rx_stats.last_frame_idx = 3115 (mvm->drv_rx_stats.last_frame_idx + 1) % 3116 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3117 3118 spin_unlock(&mvm->drv_stats_lock); 3119 } 3120 #endif 3121 3122 /* 3123 * Called after adding a new station to initialize rate scaling 3124 */ 3125 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3126 enum nl80211_band band) 3127 { 3128 int i, j; 3129 struct ieee80211_hw *hw = mvm->hw; 3130 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3131 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3132 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3133 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3134 struct ieee80211_supported_band *sband; 3135 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3136 3137 /* clear all non-persistent lq data */ 3138 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3139 3140 sband = hw->wiphy->bands[band]; 3141 3142 lq_sta->lq.sta_id = mvmsta->sta_id; 3143 mvmsta->amsdu_enabled = 0; 3144 mvmsta->max_amsdu_len = sta->max_amsdu_len; 3145 3146 for (j = 0; j < LQ_SIZE; j++) 3147 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3148 3149 lq_sta->flush_timer = 0; 3150 lq_sta->last_tx = jiffies; 3151 3152 IWL_DEBUG_RATE(mvm, 3153 "LQ: *** rate scale station global init for station %d ***\n", 3154 mvmsta->sta_id); 3155 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3156 * the lowest or the highest rate.. Could consider using RSSI from 3157 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3158 * after assoc.. */ 3159 3160 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3161 lq_sta->band = sband->band; 3162 /* 3163 * active legacy rates as per supported rates bitmap 3164 */ 3165 supp = sta->supp_rates[sband->band]; 3166 lq_sta->active_legacy_rate = 0; 3167 for_each_set_bit(i, &supp, BITS_PER_LONG) 3168 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3169 3170 /* TODO: should probably account for rx_highest for both HT/VHT */ 3171 if (!vht_cap || !vht_cap->vht_supported) 3172 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3173 else 3174 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3175 3176 lq_sta->max_legacy_rate_idx = 3177 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3178 lq_sta->max_siso_rate_idx = 3179 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3180 lq_sta->max_mimo2_rate_idx = 3181 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3182 3183 IWL_DEBUG_RATE(mvm, 3184 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3185 lq_sta->active_legacy_rate, 3186 lq_sta->active_siso_rate, 3187 lq_sta->active_mimo2_rate, 3188 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3189 lq_sta->bfer_capable); 3190 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3191 lq_sta->max_legacy_rate_idx, 3192 lq_sta->max_siso_rate_idx, 3193 lq_sta->max_mimo2_rate_idx); 3194 3195 /* These values will be overridden later */ 3196 lq_sta->lq.single_stream_ant_msk = 3197 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3198 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3199 3200 /* as default allow aggregation for all tids */ 3201 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3202 lq_sta->is_agg = 0; 3203 #ifdef CONFIG_IWLWIFI_DEBUGFS 3204 iwl_mvm_reset_frame_stats(mvm); 3205 #endif 3206 rs_initialize_lq(mvm, sta, lq_sta, band); 3207 } 3208 3209 static void rs_drv_rate_update(void *mvm_r, 3210 struct ieee80211_supported_band *sband, 3211 struct cfg80211_chan_def *chandef, 3212 struct ieee80211_sta *sta, 3213 void *priv_sta, u32 changed) 3214 { 3215 struct iwl_op_mode *op_mode = mvm_r; 3216 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3217 u8 tid; 3218 3219 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3220 return; 3221 3222 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3223 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3224 ieee80211_stop_tx_ba_session(sta, tid); 3225 3226 iwl_mvm_rs_rate_init(mvm, sta, sband->band); 3227 } 3228 3229 #ifdef CONFIG_MAC80211_DEBUGFS 3230 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3231 struct iwl_lq_cmd *lq_cmd, 3232 enum nl80211_band band, 3233 u32 ucode_rate) 3234 { 3235 struct rs_rate rate; 3236 int i; 3237 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3238 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3239 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3240 3241 for (i = 0; i < num_rates; i++) 3242 lq_cmd->rs_table[i] = ucode_rate_le32; 3243 3244 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3245 3246 if (is_mimo(&rate)) 3247 lq_cmd->mimo_delim = num_rates - 1; 3248 else 3249 lq_cmd->mimo_delim = 0; 3250 3251 lq_cmd->reduced_tpc = 0; 3252 3253 if (num_of_ant(ant) == 1) 3254 lq_cmd->single_stream_ant_msk = ant; 3255 3256 if (!mvm->trans->cfg->gen2) 3257 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3258 else 3259 lq_cmd->agg_frame_cnt_limit = 3260 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3261 } 3262 #endif /* CONFIG_MAC80211_DEBUGFS */ 3263 3264 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3265 struct iwl_lq_sta *lq_sta, 3266 struct rs_rate *rate, 3267 __le32 *rs_table, int *rs_table_index, 3268 int num_rates, int num_retries, 3269 u8 valid_tx_ant, bool toggle_ant) 3270 { 3271 int i, j; 3272 __le32 ucode_rate; 3273 bool bottom_reached = false; 3274 int prev_rate_idx = rate->index; 3275 int end = LINK_QUAL_MAX_RETRY_NUM; 3276 int index = *rs_table_index; 3277 3278 for (i = 0; i < num_rates && index < end; i++) { 3279 for (j = 0; j < num_retries && index < end; j++, index++) { 3280 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3281 rate)); 3282 rs_table[index] = ucode_rate; 3283 if (toggle_ant) 3284 rs_toggle_antenna(valid_tx_ant, rate); 3285 } 3286 3287 prev_rate_idx = rate->index; 3288 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3289 if (bottom_reached && !is_legacy(rate)) 3290 break; 3291 } 3292 3293 if (!bottom_reached && !is_legacy(rate)) 3294 rate->index = prev_rate_idx; 3295 3296 *rs_table_index = index; 3297 } 3298 3299 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3300 * column the rate table should look like this: 3301 * 3302 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3303 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3304 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3305 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3306 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3307 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3308 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3309 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3310 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3311 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3312 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3313 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3314 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3315 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3316 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3317 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3318 */ 3319 static void rs_build_rates_table(struct iwl_mvm *mvm, 3320 struct ieee80211_sta *sta, 3321 struct iwl_lq_sta *lq_sta, 3322 const struct rs_rate *initial_rate) 3323 { 3324 struct rs_rate rate; 3325 int num_rates, num_retries, index = 0; 3326 u8 valid_tx_ant = 0; 3327 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3328 bool toggle_ant = false; 3329 u32 color; 3330 3331 memcpy(&rate, initial_rate, sizeof(rate)); 3332 3333 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3334 3335 /* TODO: remove old API when min FW API hits 14 */ 3336 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3337 rs_stbc_allow(mvm, sta, lq_sta)) 3338 rate.stbc = true; 3339 3340 if (is_siso(&rate)) { 3341 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3342 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3343 } else if (is_mimo(&rate)) { 3344 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3345 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3346 } else { 3347 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3348 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3349 toggle_ant = true; 3350 } 3351 3352 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3353 num_rates, num_retries, valid_tx_ant, 3354 toggle_ant); 3355 3356 rs_get_lower_rate_down_column(lq_sta, &rate); 3357 3358 if (is_siso(&rate)) { 3359 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3360 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3361 lq_cmd->mimo_delim = index; 3362 } else if (is_legacy(&rate)) { 3363 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3364 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3365 } else { 3366 WARN_ON_ONCE(1); 3367 } 3368 3369 toggle_ant = true; 3370 3371 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3372 num_rates, num_retries, valid_tx_ant, 3373 toggle_ant); 3374 3375 rs_get_lower_rate_down_column(lq_sta, &rate); 3376 3377 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3378 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3379 3380 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3381 num_rates, num_retries, valid_tx_ant, 3382 toggle_ant); 3383 3384 /* update the color of the LQ command (as a counter at bits 1-3) */ 3385 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3386 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3387 } 3388 3389 struct rs_bfer_active_iter_data { 3390 struct ieee80211_sta *exclude_sta; 3391 struct iwl_mvm_sta *bfer_mvmsta; 3392 }; 3393 3394 static void rs_bfer_active_iter(void *_data, 3395 struct ieee80211_sta *sta) 3396 { 3397 struct rs_bfer_active_iter_data *data = _data; 3398 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3399 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3400 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3401 3402 if (sta == data->exclude_sta) 3403 return; 3404 3405 /* The current sta has BFER allowed */ 3406 if (ss_params & LQ_SS_BFER_ALLOWED) { 3407 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3408 3409 data->bfer_mvmsta = mvmsta; 3410 } 3411 } 3412 3413 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3414 { 3415 int prio = -1; 3416 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3417 3418 switch (viftype) { 3419 case NL80211_IFTYPE_AP: 3420 case NL80211_IFTYPE_P2P_GO: 3421 prio = 3; 3422 break; 3423 case NL80211_IFTYPE_P2P_CLIENT: 3424 prio = 2; 3425 break; 3426 case NL80211_IFTYPE_STATION: 3427 prio = 1; 3428 break; 3429 default: 3430 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3431 prio = -1; 3432 } 3433 3434 return prio; 3435 } 3436 3437 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3438 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3439 struct iwl_mvm_sta *sta2) 3440 { 3441 int prio1 = rs_bfer_priority(sta1); 3442 int prio2 = rs_bfer_priority(sta2); 3443 3444 if (prio1 > prio2) 3445 return 1; 3446 if (prio1 < prio2) 3447 return -1; 3448 return 0; 3449 } 3450 3451 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3452 struct ieee80211_sta *sta, 3453 struct iwl_lq_sta *lq_sta, 3454 const struct rs_rate *initial_rate) 3455 { 3456 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3457 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3458 struct rs_bfer_active_iter_data data = { 3459 .exclude_sta = sta, 3460 .bfer_mvmsta = NULL, 3461 }; 3462 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3463 u32 ss_params = LQ_SS_PARAMS_VALID; 3464 3465 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3466 goto out; 3467 3468 #ifdef CONFIG_MAC80211_DEBUGFS 3469 /* Check if forcing the decision is configured. 3470 * Note that SISO is forced by not allowing STBC or BFER 3471 */ 3472 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3473 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3474 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3475 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3476 3477 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3478 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3479 lq_sta->pers.ss_force); 3480 goto out; 3481 } 3482 #endif 3483 3484 if (lq_sta->stbc_capable) 3485 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3486 3487 if (!lq_sta->bfer_capable) 3488 goto out; 3489 3490 ieee80211_iterate_stations_atomic(mvm->hw, 3491 rs_bfer_active_iter, 3492 &data); 3493 bfer_mvmsta = data.bfer_mvmsta; 3494 3495 /* This code is safe as it doesn't run concurrently for different 3496 * stations. This is guaranteed by the fact that calls to 3497 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3498 */ 3499 if (!bfer_mvmsta) { 3500 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3501 3502 ss_params |= LQ_SS_BFER_ALLOWED; 3503 goto out; 3504 } 3505 3506 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3507 bfer_mvmsta->sta_id); 3508 3509 /* Disallow BFER on another STA if active and we're a higher priority */ 3510 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3511 struct iwl_lq_cmd *bfersta_lq_cmd = 3512 &bfer_mvmsta->lq_sta.rs_drv.lq; 3513 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3514 3515 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3516 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3517 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3518 3519 ss_params |= LQ_SS_BFER_ALLOWED; 3520 IWL_DEBUG_RATE(mvm, 3521 "Lower priority BFER sta found (%d). Switch BFER\n", 3522 bfer_mvmsta->sta_id); 3523 } 3524 out: 3525 lq_cmd->ss_params = cpu_to_le32(ss_params); 3526 } 3527 3528 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3529 struct ieee80211_sta *sta, 3530 struct iwl_lq_sta *lq_sta, 3531 const struct rs_rate *initial_rate) 3532 { 3533 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3534 struct iwl_mvm_sta *mvmsta; 3535 struct iwl_mvm_vif *mvmvif; 3536 3537 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3538 lq_cmd->agg_time_limit = 3539 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3540 3541 #ifdef CONFIG_MAC80211_DEBUGFS 3542 if (lq_sta->pers.dbg_fixed_rate) { 3543 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3544 lq_sta->band, 3545 lq_sta->pers.dbg_fixed_rate); 3546 return; 3547 } 3548 #endif 3549 if (WARN_ON_ONCE(!sta || !initial_rate)) 3550 return; 3551 3552 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3553 3554 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3555 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3556 3557 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3558 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3559 3560 if (num_of_ant(initial_rate->ant) == 1) 3561 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3562 3563 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3564 3565 /* 3566 * In case of low latency, tell the firmware to leave a frame in the 3567 * Tx Fifo so that it can start a transaction in the same TxOP. This 3568 * basically allows the firmware to send bursts. 3569 */ 3570 if (iwl_mvm_vif_low_latency(mvmvif)) 3571 lq_cmd->agg_frame_cnt_limit--; 3572 3573 if (mvmsta->vif->p2p) 3574 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3575 3576 lq_cmd->agg_time_limit = 3577 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3578 } 3579 3580 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3581 { 3582 return hw->priv; 3583 } 3584 3585 /* rate scale requires free function to be implemented */ 3586 static void rs_free(void *mvm_rate) 3587 { 3588 return; 3589 } 3590 3591 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3592 { 3593 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3594 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3595 3596 IWL_DEBUG_RATE(mvm, "enter\n"); 3597 IWL_DEBUG_RATE(mvm, "leave\n"); 3598 } 3599 3600 #ifdef CONFIG_MAC80211_DEBUGFS 3601 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3602 { 3603 3604 char *type, *bw; 3605 u8 mcs = 0, nss = 0; 3606 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3607 3608 if (!(rate & RATE_MCS_HT_MSK) && 3609 !(rate & RATE_MCS_VHT_MSK)) { 3610 int index = iwl_hwrate_to_plcp_idx(rate); 3611 3612 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3613 rs_pretty_ant(ant), 3614 index == IWL_RATE_INVALID ? "BAD" : 3615 iwl_rate_mcs[index].mbps); 3616 } 3617 3618 if (rate & RATE_MCS_VHT_MSK) { 3619 type = "VHT"; 3620 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3621 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3622 >> RATE_VHT_MCS_NSS_POS) + 1; 3623 } else if (rate & RATE_MCS_HT_MSK) { 3624 type = "HT"; 3625 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3626 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3627 >> RATE_HT_MCS_NSS_POS) + 1; 3628 } else { 3629 type = "Unknown"; /* shouldn't happen */ 3630 } 3631 3632 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3633 case RATE_MCS_CHAN_WIDTH_20: 3634 bw = "20Mhz"; 3635 break; 3636 case RATE_MCS_CHAN_WIDTH_40: 3637 bw = "40Mhz"; 3638 break; 3639 case RATE_MCS_CHAN_WIDTH_80: 3640 bw = "80Mhz"; 3641 break; 3642 case RATE_MCS_CHAN_WIDTH_160: 3643 bw = "160Mhz"; 3644 break; 3645 default: 3646 bw = "BAD BW"; 3647 } 3648 3649 return scnprintf(buf, bufsz, 3650 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3651 type, rs_pretty_ant(ant), bw, mcs, nss, 3652 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3653 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3654 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3655 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3656 } 3657 3658 /** 3659 * Program the device to use fixed rate for frame transmit 3660 * This is for debugging/testing only 3661 * once the device start use fixed rate, we need to reload the module 3662 * to being back the normal operation. 3663 */ 3664 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3665 struct iwl_lq_sta *lq_sta) 3666 { 3667 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3668 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3669 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3670 3671 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3672 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3673 3674 if (lq_sta->pers.dbg_fixed_rate) { 3675 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3676 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3677 } 3678 } 3679 3680 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3681 const char __user *user_buf, size_t count, loff_t *ppos) 3682 { 3683 struct iwl_lq_sta *lq_sta = file->private_data; 3684 struct iwl_mvm *mvm; 3685 char buf[64]; 3686 size_t buf_size; 3687 u32 parsed_rate; 3688 3689 mvm = lq_sta->pers.drv; 3690 memset(buf, 0, sizeof(buf)); 3691 buf_size = min(count, sizeof(buf) - 1); 3692 if (copy_from_user(buf, user_buf, buf_size)) 3693 return -EFAULT; 3694 3695 if (sscanf(buf, "%x", &parsed_rate) == 1) 3696 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3697 else 3698 lq_sta->pers.dbg_fixed_rate = 0; 3699 3700 rs_program_fix_rate(mvm, lq_sta); 3701 3702 return count; 3703 } 3704 3705 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3706 char __user *user_buf, size_t count, loff_t *ppos) 3707 { 3708 char *buff; 3709 int desc = 0; 3710 int i = 0; 3711 ssize_t ret; 3712 static const size_t bufsz = 2048; 3713 3714 struct iwl_lq_sta *lq_sta = file->private_data; 3715 struct iwl_mvm_sta *mvmsta = 3716 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3717 struct iwl_mvm *mvm; 3718 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3719 struct rs_rate *rate = &tbl->rate; 3720 u32 ss_params; 3721 3722 mvm = lq_sta->pers.drv; 3723 buff = kmalloc(bufsz, GFP_KERNEL); 3724 if (!buff) 3725 return -ENOMEM; 3726 3727 desc += scnprintf(buff + desc, bufsz - desc, 3728 "sta_id %d\n", lq_sta->lq.sta_id); 3729 desc += scnprintf(buff + desc, bufsz - desc, 3730 "failed=%d success=%d rate=0%lX\n", 3731 lq_sta->total_failed, lq_sta->total_success, 3732 lq_sta->active_legacy_rate); 3733 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3734 lq_sta->pers.dbg_fixed_rate); 3735 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3736 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3737 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3738 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3739 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3740 (is_legacy(rate)) ? "legacy" : 3741 is_vht(rate) ? "VHT" : "HT"); 3742 if (!is_legacy(rate)) { 3743 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3744 (is_siso(rate)) ? "SISO" : "MIMO2"); 3745 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3746 (is_ht20(rate)) ? "20MHz" : 3747 (is_ht40(rate)) ? "40MHz" : 3748 (is_ht80(rate)) ? "80MHz" : 3749 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3750 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3751 (rate->sgi) ? "SGI" : "NGI", 3752 (rate->ldpc) ? "LDPC" : "BCC", 3753 (lq_sta->is_agg) ? "AGG on" : "", 3754 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3755 } 3756 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3757 lq_sta->last_rate_n_flags); 3758 desc += scnprintf(buff + desc, bufsz - desc, 3759 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3760 lq_sta->lq.flags, 3761 lq_sta->lq.mimo_delim, 3762 lq_sta->lq.single_stream_ant_msk, 3763 lq_sta->lq.dual_stream_ant_msk); 3764 3765 desc += scnprintf(buff + desc, bufsz - desc, 3766 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3767 le16_to_cpu(lq_sta->lq.agg_time_limit), 3768 lq_sta->lq.agg_disable_start_th, 3769 lq_sta->lq.agg_frame_cnt_limit); 3770 3771 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3772 lq_sta->lq.reduced_tpc); 3773 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3774 desc += scnprintf(buff + desc, bufsz - desc, 3775 "single stream params: %s%s%s%s\n", 3776 (ss_params & LQ_SS_PARAMS_VALID) ? 3777 "VALID" : "INVALID", 3778 (ss_params & LQ_SS_BFER_ALLOWED) ? 3779 ", BFER" : "", 3780 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3781 ", STBC" : "", 3782 (ss_params & LQ_SS_FORCE) ? 3783 ", FORCE" : ""); 3784 desc += scnprintf(buff + desc, bufsz - desc, 3785 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3786 lq_sta->lq.initial_rate_index[0], 3787 lq_sta->lq.initial_rate_index[1], 3788 lq_sta->lq.initial_rate_index[2], 3789 lq_sta->lq.initial_rate_index[3]); 3790 3791 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3792 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3793 3794 desc += scnprintf(buff + desc, bufsz - desc, 3795 " rate[%d] 0x%X ", i, r); 3796 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3797 } 3798 3799 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3800 kfree(buff); 3801 return ret; 3802 } 3803 3804 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3805 .write = rs_sta_dbgfs_scale_table_write, 3806 .read = rs_sta_dbgfs_scale_table_read, 3807 .open = simple_open, 3808 .llseek = default_llseek, 3809 }; 3810 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3811 char __user *user_buf, size_t count, loff_t *ppos) 3812 { 3813 char *buff; 3814 int desc = 0; 3815 int i, j; 3816 ssize_t ret; 3817 struct iwl_scale_tbl_info *tbl; 3818 struct rs_rate *rate; 3819 struct iwl_lq_sta *lq_sta = file->private_data; 3820 3821 buff = kmalloc(1024, GFP_KERNEL); 3822 if (!buff) 3823 return -ENOMEM; 3824 3825 for (i = 0; i < LQ_SIZE; i++) { 3826 tbl = &(lq_sta->lq_info[i]); 3827 rate = &tbl->rate; 3828 desc += sprintf(buff+desc, 3829 "%s type=%d SGI=%d BW=%s DUP=0\n" 3830 "index=%d\n", 3831 lq_sta->active_tbl == i ? "*" : "x", 3832 rate->type, 3833 rate->sgi, 3834 is_ht20(rate) ? "20MHz" : 3835 is_ht40(rate) ? "40MHz" : 3836 is_ht80(rate) ? "80MHz" : 3837 is_ht160(rate) ? "160MHz" : "ERR", 3838 rate->index); 3839 for (j = 0; j < IWL_RATE_COUNT; j++) { 3840 desc += sprintf(buff+desc, 3841 "counter=%d success=%d %%=%d\n", 3842 tbl->win[j].counter, 3843 tbl->win[j].success_counter, 3844 tbl->win[j].success_ratio); 3845 } 3846 } 3847 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3848 kfree(buff); 3849 return ret; 3850 } 3851 3852 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3853 .read = rs_sta_dbgfs_stats_table_read, 3854 .open = simple_open, 3855 .llseek = default_llseek, 3856 }; 3857 3858 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3859 char __user *user_buf, 3860 size_t count, loff_t *ppos) 3861 { 3862 static const char * const column_name[] = { 3863 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3864 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3865 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3866 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3867 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3868 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3869 [RS_COLUMN_MIMO2] = "MIMO2", 3870 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3871 }; 3872 3873 static const char * const rate_name[] = { 3874 [IWL_RATE_1M_INDEX] = "1M", 3875 [IWL_RATE_2M_INDEX] = "2M", 3876 [IWL_RATE_5M_INDEX] = "5.5M", 3877 [IWL_RATE_11M_INDEX] = "11M", 3878 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3879 [IWL_RATE_9M_INDEX] = "9M", 3880 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3881 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3882 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3883 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3884 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3885 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3886 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3887 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3888 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3889 }; 3890 3891 char *buff, *pos, *endpos; 3892 int col, rate; 3893 ssize_t ret; 3894 struct iwl_lq_sta *lq_sta = file->private_data; 3895 struct rs_rate_stats *stats; 3896 static const size_t bufsz = 1024; 3897 3898 buff = kmalloc(bufsz, GFP_KERNEL); 3899 if (!buff) 3900 return -ENOMEM; 3901 3902 pos = buff; 3903 endpos = pos + bufsz; 3904 3905 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3906 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3907 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3908 pos += scnprintf(pos, endpos - pos, "\n"); 3909 3910 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3911 pos += scnprintf(pos, endpos - pos, 3912 "%s,", column_name[col]); 3913 3914 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3915 stats = &(lq_sta->pers.tx_stats[col][rate]); 3916 pos += scnprintf(pos, endpos - pos, 3917 "%llu/%llu,", 3918 stats->success, 3919 stats->total); 3920 } 3921 pos += scnprintf(pos, endpos - pos, "\n"); 3922 } 3923 3924 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3925 kfree(buff); 3926 return ret; 3927 } 3928 3929 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3930 const char __user *user_buf, 3931 size_t count, loff_t *ppos) 3932 { 3933 struct iwl_lq_sta *lq_sta = file->private_data; 3934 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3935 3936 return count; 3937 } 3938 3939 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3940 .read = rs_sta_dbgfs_drv_tx_stats_read, 3941 .write = rs_sta_dbgfs_drv_tx_stats_write, 3942 .open = simple_open, 3943 .llseek = default_llseek, 3944 }; 3945 3946 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3947 char __user *user_buf, 3948 size_t count, loff_t *ppos) 3949 { 3950 struct iwl_lq_sta *lq_sta = file->private_data; 3951 char buf[12]; 3952 int bufsz = sizeof(buf); 3953 int pos = 0; 3954 static const char * const ss_force_name[] = { 3955 [RS_SS_FORCE_NONE] = "none", 3956 [RS_SS_FORCE_STBC] = "stbc", 3957 [RS_SS_FORCE_BFER] = "bfer", 3958 [RS_SS_FORCE_SISO] = "siso", 3959 }; 3960 3961 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3962 ss_force_name[lq_sta->pers.ss_force]); 3963 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3964 } 3965 3966 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3967 size_t count, loff_t *ppos) 3968 { 3969 struct iwl_mvm *mvm = lq_sta->pers.drv; 3970 int ret = 0; 3971 3972 if (!strncmp("none", buf, 4)) { 3973 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3974 } else if (!strncmp("siso", buf, 4)) { 3975 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3976 } else if (!strncmp("stbc", buf, 4)) { 3977 if (lq_sta->stbc_capable) { 3978 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3979 } else { 3980 IWL_ERR(mvm, 3981 "can't force STBC. peer doesn't support\n"); 3982 ret = -EINVAL; 3983 } 3984 } else if (!strncmp("bfer", buf, 4)) { 3985 if (lq_sta->bfer_capable) { 3986 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3987 } else { 3988 IWL_ERR(mvm, 3989 "can't force BFER. peer doesn't support\n"); 3990 ret = -EINVAL; 3991 } 3992 } else { 3993 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3994 ret = -EINVAL; 3995 } 3996 return ret ?: count; 3997 } 3998 3999 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4000 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4001 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4002 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 4003 &iwl_dbgfs_##name##_ops)) \ 4004 goto err; \ 4005 } while (0) 4006 4007 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4008 4009 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4010 struct dentry *dir) 4011 { 4012 struct iwl_lq_sta *lq_sta = priv_sta; 4013 struct iwl_mvm_sta *mvmsta; 4014 4015 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4016 4017 if (!mvmsta->vif) 4018 return; 4019 4020 debugfs_create_file("rate_scale_table", 0600, dir, 4021 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4022 debugfs_create_file("rate_stats_table", 0400, dir, 4023 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4024 debugfs_create_file("drv_tx_stats", 0600, dir, 4025 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4026 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4027 &lq_sta->tx_agg_tid_en); 4028 debugfs_create_u8("reduced_tpc", 0600, dir, 4029 &lq_sta->pers.dbg_fixed_txp_reduction); 4030 4031 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4032 return; 4033 err: 4034 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4035 } 4036 4037 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta) 4038 { 4039 } 4040 #endif 4041 4042 /* 4043 * Initialization of rate scaling information is done by driver after 4044 * the station is added. Since mac80211 calls this function before a 4045 * station is added we ignore it. 4046 */ 4047 static void rs_rate_init_ops(void *mvm_r, 4048 struct ieee80211_supported_band *sband, 4049 struct cfg80211_chan_def *chandef, 4050 struct ieee80211_sta *sta, void *mvm_sta) 4051 { 4052 } 4053 4054 /* ops for rate scaling implemented in the driver */ 4055 static const struct rate_control_ops rs_mvm_ops_drv = { 4056 .name = RS_NAME, 4057 .tx_status = rs_drv_mac80211_tx_status, 4058 .get_rate = rs_drv_get_rate, 4059 .rate_init = rs_rate_init_ops, 4060 .alloc = rs_alloc, 4061 .free = rs_free, 4062 .alloc_sta = rs_drv_alloc_sta, 4063 .free_sta = rs_free_sta, 4064 .rate_update = rs_drv_rate_update, 4065 #ifdef CONFIG_MAC80211_DEBUGFS 4066 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4067 .remove_sta_debugfs = rs_remove_sta_debugfs, 4068 #endif 4069 }; 4070 4071 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4072 enum nl80211_band band) 4073 { 4074 if (iwl_mvm_has_tlc_offload(mvm)) 4075 rs_fw_rate_init(mvm, sta, band); 4076 else 4077 rs_drv_rate_init(mvm, sta, band); 4078 } 4079 4080 int iwl_mvm_rate_control_register(void) 4081 { 4082 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4083 } 4084 4085 void iwl_mvm_rate_control_unregister(void) 4086 { 4087 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4088 } 4089 4090 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4091 bool enable) 4092 { 4093 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4094 4095 lockdep_assert_held(&mvm->mutex); 4096 4097 if (enable) { 4098 if (mvmsta->tx_protection == 0) 4099 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4100 mvmsta->tx_protection++; 4101 } else { 4102 mvmsta->tx_protection--; 4103 if (mvmsta->tx_protection == 0) 4104 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4105 } 4106 4107 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4108 } 4109 4110 /** 4111 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4112 * @mvmsta: The station 4113 * @enable: Enable Tx protection? 4114 */ 4115 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4116 bool enable) 4117 { 4118 if (iwl_mvm_has_tlc_offload(mvm)) 4119 return rs_fw_tx_protection(mvm, mvmsta, enable); 4120 else 4121 return rs_drv_tx_protection(mvm, mvmsta, enable); 4122 } 4123