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 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 if (!sta->ht_cap.ht_supported) 165 return false; 166 167 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 168 return false; 169 170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 171 return false; 172 173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 174 return false; 175 176 if (mvm->nvm_data->sku_cap_mimo_disabled) 177 return false; 178 179 return true; 180 } 181 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 183 struct rs_rate *rate, 184 const struct rs_tx_column *next_col) 185 { 186 if (!sta->ht_cap.ht_supported) 187 return false; 188 189 return true; 190 } 191 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 193 struct rs_rate *rate, 194 const struct rs_tx_column *next_col) 195 { 196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 198 199 if (is_ht20(rate) && (ht_cap->cap & 200 IEEE80211_HT_CAP_SGI_20)) 201 return true; 202 if (is_ht40(rate) && (ht_cap->cap & 203 IEEE80211_HT_CAP_SGI_40)) 204 return true; 205 if (is_ht80(rate) && (vht_cap->cap & 206 IEEE80211_VHT_CAP_SHORT_GI_80)) 207 return true; 208 if (is_ht160(rate) && (vht_cap->cap & 209 IEEE80211_VHT_CAP_SHORT_GI_160)) 210 return true; 211 212 return false; 213 } 214 215 static const struct rs_tx_column rs_tx_columns[] = { 216 [RS_COLUMN_LEGACY_ANT_A] = { 217 .mode = RS_LEGACY, 218 .ant = ANT_A, 219 .next_columns = { 220 RS_COLUMN_LEGACY_ANT_B, 221 RS_COLUMN_SISO_ANT_A, 222 RS_COLUMN_MIMO2, 223 RS_COLUMN_INVALID, 224 RS_COLUMN_INVALID, 225 RS_COLUMN_INVALID, 226 RS_COLUMN_INVALID, 227 }, 228 .checks = { 229 rs_ant_allow, 230 }, 231 }, 232 [RS_COLUMN_LEGACY_ANT_B] = { 233 .mode = RS_LEGACY, 234 .ant = ANT_B, 235 .next_columns = { 236 RS_COLUMN_LEGACY_ANT_A, 237 RS_COLUMN_SISO_ANT_B, 238 RS_COLUMN_MIMO2, 239 RS_COLUMN_INVALID, 240 RS_COLUMN_INVALID, 241 RS_COLUMN_INVALID, 242 RS_COLUMN_INVALID, 243 }, 244 .checks = { 245 rs_ant_allow, 246 }, 247 }, 248 [RS_COLUMN_SISO_ANT_A] = { 249 .mode = RS_SISO, 250 .ant = ANT_A, 251 .next_columns = { 252 RS_COLUMN_SISO_ANT_B, 253 RS_COLUMN_MIMO2, 254 RS_COLUMN_SISO_ANT_A_SGI, 255 RS_COLUMN_LEGACY_ANT_A, 256 RS_COLUMN_LEGACY_ANT_B, 257 RS_COLUMN_INVALID, 258 RS_COLUMN_INVALID, 259 }, 260 .checks = { 261 rs_siso_allow, 262 rs_ant_allow, 263 }, 264 }, 265 [RS_COLUMN_SISO_ANT_B] = { 266 .mode = RS_SISO, 267 .ant = ANT_B, 268 .next_columns = { 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_MIMO2, 271 RS_COLUMN_SISO_ANT_B_SGI, 272 RS_COLUMN_LEGACY_ANT_A, 273 RS_COLUMN_LEGACY_ANT_B, 274 RS_COLUMN_INVALID, 275 RS_COLUMN_INVALID, 276 }, 277 .checks = { 278 rs_siso_allow, 279 rs_ant_allow, 280 }, 281 }, 282 [RS_COLUMN_SISO_ANT_A_SGI] = { 283 .mode = RS_SISO, 284 .ant = ANT_A, 285 .sgi = true, 286 .next_columns = { 287 RS_COLUMN_SISO_ANT_B_SGI, 288 RS_COLUMN_MIMO2_SGI, 289 RS_COLUMN_SISO_ANT_A, 290 RS_COLUMN_LEGACY_ANT_A, 291 RS_COLUMN_LEGACY_ANT_B, 292 RS_COLUMN_INVALID, 293 RS_COLUMN_INVALID, 294 }, 295 .checks = { 296 rs_siso_allow, 297 rs_ant_allow, 298 rs_sgi_allow, 299 }, 300 }, 301 [RS_COLUMN_SISO_ANT_B_SGI] = { 302 .mode = RS_SISO, 303 .ant = ANT_B, 304 .sgi = true, 305 .next_columns = { 306 RS_COLUMN_SISO_ANT_A_SGI, 307 RS_COLUMN_MIMO2_SGI, 308 RS_COLUMN_SISO_ANT_B, 309 RS_COLUMN_LEGACY_ANT_A, 310 RS_COLUMN_LEGACY_ANT_B, 311 RS_COLUMN_INVALID, 312 RS_COLUMN_INVALID, 313 }, 314 .checks = { 315 rs_siso_allow, 316 rs_ant_allow, 317 rs_sgi_allow, 318 }, 319 }, 320 [RS_COLUMN_MIMO2] = { 321 .mode = RS_MIMO2, 322 .ant = ANT_AB, 323 .next_columns = { 324 RS_COLUMN_SISO_ANT_A, 325 RS_COLUMN_MIMO2_SGI, 326 RS_COLUMN_LEGACY_ANT_A, 327 RS_COLUMN_LEGACY_ANT_B, 328 RS_COLUMN_INVALID, 329 RS_COLUMN_INVALID, 330 RS_COLUMN_INVALID, 331 }, 332 .checks = { 333 rs_mimo_allow, 334 }, 335 }, 336 [RS_COLUMN_MIMO2_SGI] = { 337 .mode = RS_MIMO2, 338 .ant = ANT_AB, 339 .sgi = true, 340 .next_columns = { 341 RS_COLUMN_SISO_ANT_A_SGI, 342 RS_COLUMN_MIMO2, 343 RS_COLUMN_LEGACY_ANT_A, 344 RS_COLUMN_LEGACY_ANT_B, 345 RS_COLUMN_INVALID, 346 RS_COLUMN_INVALID, 347 RS_COLUMN_INVALID, 348 }, 349 .checks = { 350 rs_mimo_allow, 351 rs_sgi_allow, 352 }, 353 }, 354 }; 355 356 static inline u8 rs_extract_rate(u32 rate_n_flags) 357 { 358 /* also works for HT because bits 7:6 are zero there */ 359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 360 } 361 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 363 { 364 int idx = 0; 365 366 if (rate_n_flags & RATE_MCS_HT_MSK) { 367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 368 idx += IWL_RATE_MCS_0_INDEX; 369 370 /* skip 9M not supported in HT*/ 371 if (idx >= IWL_RATE_9M_INDEX) 372 idx += 1; 373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 374 return idx; 375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 377 idx += IWL_RATE_MCS_0_INDEX; 378 379 /* skip 9M not supported in VHT*/ 380 if (idx >= IWL_RATE_9M_INDEX) 381 idx++; 382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 383 return idx; 384 } else { 385 /* legacy rate format, search for match in table */ 386 387 u8 legacy_rate = rs_extract_rate(rate_n_flags); 388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 389 if (iwl_rates[idx].plcp == legacy_rate) 390 return idx; 391 } 392 393 return IWL_RATE_INVALID; 394 } 395 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 397 struct ieee80211_sta *sta, 398 struct iwl_lq_sta *lq_sta, 399 int tid, bool ndp); 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 401 struct ieee80211_sta *sta, 402 struct iwl_lq_sta *lq_sta, 403 const struct rs_rate *initial_rate); 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 405 406 /** 407 * The following tables contain the expected throughput metrics for all rates 408 * 409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 410 * 411 * where invalid entries are zeros. 412 * 413 * CCK rates are only valid in legacy table and will only be used in G 414 * (2.4 GHz) band. 415 */ 416 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 419 }; 420 421 /* Expected TpT tables. 4 indexes: 422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 423 */ 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 429 }; 430 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 436 }; 437 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 443 }; 444 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 450 }; 451 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 457 }; 458 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 464 }; 465 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 471 }; 472 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 478 }; 479 480 /* mbps, mcs */ 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 482 { "1", "BPSK DSSS"}, 483 { "2", "QPSK DSSS"}, 484 {"5.5", "BPSK CCK"}, 485 { "11", "QPSK CCK"}, 486 { "6", "BPSK 1/2"}, 487 { "9", "BPSK 1/2"}, 488 { "12", "QPSK 1/2"}, 489 { "18", "QPSK 3/4"}, 490 { "24", "16QAM 1/2"}, 491 { "36", "16QAM 3/4"}, 492 { "48", "64QAM 2/3"}, 493 { "54", "64QAM 3/4"}, 494 { "60", "64QAM 5/6"}, 495 }; 496 497 #define MCS_INDEX_PER_STREAM (8) 498 499 static const char *rs_pretty_ant(u8 ant) 500 { 501 static const char * const ant_name[] = { 502 [ANT_NONE] = "None", 503 [ANT_A] = "A", 504 [ANT_B] = "B", 505 [ANT_AB] = "AB", 506 [ANT_C] = "C", 507 [ANT_AC] = "AC", 508 [ANT_BC] = "BC", 509 [ANT_ABC] = "ABC", 510 }; 511 512 if (ant > ANT_ABC) 513 return "UNKNOWN"; 514 515 return ant_name[ant]; 516 } 517 518 static const char *rs_pretty_lq_type(enum iwl_table_type type) 519 { 520 static const char * const lq_types[] = { 521 [LQ_NONE] = "NONE", 522 [LQ_LEGACY_A] = "LEGACY_A", 523 [LQ_LEGACY_G] = "LEGACY_G", 524 [LQ_HT_SISO] = "HT SISO", 525 [LQ_HT_MIMO2] = "HT MIMO", 526 [LQ_VHT_SISO] = "VHT SISO", 527 [LQ_VHT_MIMO2] = "VHT MIMO", 528 }; 529 530 if (type < LQ_NONE || type >= LQ_MAX) 531 return "UNKNOWN"; 532 533 return lq_types[type]; 534 } 535 536 static char *rs_pretty_rate(const struct rs_rate *rate) 537 { 538 static char buf[40]; 539 static const char * const legacy_rates[] = { 540 [IWL_RATE_1M_INDEX] = "1M", 541 [IWL_RATE_2M_INDEX] = "2M", 542 [IWL_RATE_5M_INDEX] = "5.5M", 543 [IWL_RATE_11M_INDEX] = "11M", 544 [IWL_RATE_6M_INDEX] = "6M", 545 [IWL_RATE_9M_INDEX] = "9M", 546 [IWL_RATE_12M_INDEX] = "12M", 547 [IWL_RATE_18M_INDEX] = "18M", 548 [IWL_RATE_24M_INDEX] = "24M", 549 [IWL_RATE_36M_INDEX] = "36M", 550 [IWL_RATE_48M_INDEX] = "48M", 551 [IWL_RATE_54M_INDEX] = "54M", 552 }; 553 static const char *const ht_vht_rates[] = { 554 [IWL_RATE_MCS_0_INDEX] = "MCS0", 555 [IWL_RATE_MCS_1_INDEX] = "MCS1", 556 [IWL_RATE_MCS_2_INDEX] = "MCS2", 557 [IWL_RATE_MCS_3_INDEX] = "MCS3", 558 [IWL_RATE_MCS_4_INDEX] = "MCS4", 559 [IWL_RATE_MCS_5_INDEX] = "MCS5", 560 [IWL_RATE_MCS_6_INDEX] = "MCS6", 561 [IWL_RATE_MCS_7_INDEX] = "MCS7", 562 [IWL_RATE_MCS_8_INDEX] = "MCS8", 563 [IWL_RATE_MCS_9_INDEX] = "MCS9", 564 }; 565 const char *rate_str; 566 567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 568 rate_str = legacy_rates[rate->index]; 569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 570 (rate->index >= IWL_RATE_MCS_0_INDEX) && 571 (rate->index <= IWL_RATE_MCS_9_INDEX)) 572 rate_str = ht_vht_rates[rate->index]; 573 else 574 rate_str = "BAD_RATE"; 575 576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 577 rs_pretty_ant(rate->ant), rate_str); 578 return buf; 579 } 580 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 582 const char *prefix) 583 { 584 IWL_DEBUG_RATE(mvm, 585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 586 prefix, rs_pretty_rate(rate), rate->bw, 587 rate->sgi, rate->ldpc, rate->stbc); 588 } 589 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 591 { 592 window->data = 0; 593 window->success_counter = 0; 594 window->success_ratio = IWL_INVALID_VALUE; 595 window->counter = 0; 596 window->average_tpt = IWL_INVALID_VALUE; 597 } 598 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 600 struct iwl_scale_tbl_info *tbl) 601 { 602 int i; 603 604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 605 for (i = 0; i < IWL_RATE_COUNT; i++) 606 rs_rate_scale_clear_window(&tbl->win[i]); 607 608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 609 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 610 } 611 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 613 { 614 return (ant_type & valid_antenna) == ant_type; 615 } 616 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 618 struct iwl_lq_sta *lq_data, u8 tid, 619 struct ieee80211_sta *sta) 620 { 621 int ret = -EAGAIN; 622 623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 624 sta->addr, tid); 625 626 /* start BA session until the peer sends del BA */ 627 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 628 if (ret == -EAGAIN) { 629 /* 630 * driver and mac80211 is out of sync 631 * this might be cause by reloading firmware 632 * stop the tx ba session here 633 */ 634 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 635 tid); 636 ieee80211_stop_tx_ba_session(sta, tid); 637 } 638 return ret; 639 } 640 641 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 642 u8 tid, struct iwl_lq_sta *lq_sta, 643 struct ieee80211_sta *sta) 644 { 645 struct iwl_mvm_tid_data *tid_data; 646 647 /* 648 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 649 * when the frame is not QoS 650 */ 651 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 652 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 653 tid, IWL_MAX_TID_COUNT); 654 return; 655 } else if (tid == IWL_MAX_TID_COUNT) { 656 return; 657 } 658 659 tid_data = &mvmsta->tid_data[tid]; 660 if ((tid_data->state == IWL_AGG_OFF) && 661 (lq_sta->tx_agg_tid_en & BIT(tid)) && 662 (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 663 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 664 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 665 tid_data->state = IWL_AGG_QUEUED; 666 } 667 } 668 669 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 670 { 671 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 672 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 673 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 674 } 675 676 /* 677 * Static function to get the expected throughput from an iwl_scale_tbl_info 678 * that wraps a NULL pointer check 679 */ 680 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 681 { 682 if (tbl->expected_tpt) 683 return tbl->expected_tpt[rs_index]; 684 return 0; 685 } 686 687 /** 688 * rs_collect_tx_data - Update the success/failure sliding window 689 * 690 * We keep a sliding window of the last 62 packets transmitted 691 * at this rate. window->data contains the bitmask of successful 692 * packets. 693 */ 694 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 695 struct iwl_scale_tbl_info *tbl, 696 int scale_index, int attempts, int successes, 697 struct iwl_rate_scale_data *window) 698 { 699 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 700 s32 fail_count, tpt; 701 702 /* Get expected throughput */ 703 tpt = get_expected_tpt(tbl, scale_index); 704 705 /* 706 * Keep track of only the latest 62 tx frame attempts in this rate's 707 * history window; anything older isn't really relevant any more. 708 * If we have filled up the sliding window, drop the oldest attempt; 709 * if the oldest attempt (highest bit in bitmap) shows "success", 710 * subtract "1" from the success counter (this is the main reason 711 * we keep these bitmaps!). 712 */ 713 while (attempts > 0) { 714 if (window->counter >= IWL_RATE_MAX_WINDOW) { 715 /* remove earliest */ 716 window->counter = IWL_RATE_MAX_WINDOW - 1; 717 718 if (window->data & mask) { 719 window->data &= ~mask; 720 window->success_counter--; 721 } 722 } 723 724 /* Increment frames-attempted counter */ 725 window->counter++; 726 727 /* Shift bitmap by one frame to throw away oldest history */ 728 window->data <<= 1; 729 730 /* Mark the most recent #successes attempts as successful */ 731 if (successes > 0) { 732 window->success_counter++; 733 window->data |= 0x1; 734 successes--; 735 } 736 737 attempts--; 738 } 739 740 /* Calculate current success ratio, avoid divide-by-0! */ 741 if (window->counter > 0) 742 window->success_ratio = 128 * (100 * window->success_counter) 743 / window->counter; 744 else 745 window->success_ratio = IWL_INVALID_VALUE; 746 747 fail_count = window->counter - window->success_counter; 748 749 /* Calculate average throughput, if we have enough history. */ 750 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 751 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 752 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 753 else 754 window->average_tpt = IWL_INVALID_VALUE; 755 756 return 0; 757 } 758 759 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 760 struct iwl_lq_sta *lq_sta, 761 struct iwl_scale_tbl_info *tbl, 762 int scale_index, int attempts, int successes, 763 u8 reduced_txp) 764 { 765 struct iwl_rate_scale_data *window = NULL; 766 767 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 768 return -EINVAL; 769 770 window = &tbl->tpc_win[reduced_txp]; 771 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 772 window); 773 } 774 775 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 776 struct iwl_mvm_sta *mvmsta, 777 u8 tid, int successes) 778 { 779 struct iwl_mvm_tid_data *tid_data; 780 781 if (tid >= IWL_MAX_TID_COUNT) 782 return; 783 784 tid_data = &mvmsta->tid_data[tid]; 785 786 /* 787 * Measure if there're enough successful transmits per second. 788 * These statistics are used only to decide if we can start a 789 * BA session, so it should be updated only when A-MPDU is 790 * off. 791 */ 792 if (tid_data->state != IWL_AGG_OFF) 793 return; 794 795 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 796 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 797 tid_data->tx_count_last = tid_data->tx_count; 798 tid_data->tx_count = 0; 799 tid_data->tpt_meas_start = jiffies; 800 } else { 801 tid_data->tx_count += successes; 802 } 803 } 804 805 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 806 struct iwl_mvm_sta *mvmsta, u8 tid, 807 struct iwl_scale_tbl_info *tbl, 808 int scale_index, int attempts, int successes) 809 { 810 struct iwl_rate_scale_data *window = NULL; 811 812 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 813 return -EINVAL; 814 815 if (tbl->column != RS_COLUMN_INVALID) { 816 struct lq_sta_pers *pers = &mvmsta->lq_sta.pers; 817 818 pers->tx_stats[tbl->column][scale_index].total += attempts; 819 pers->tx_stats[tbl->column][scale_index].success += successes; 820 } 821 822 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 823 824 /* Select window for current tx bit rate */ 825 window = &(tbl->win[scale_index]); 826 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 827 window); 828 } 829 830 /* Convert rs_rate object into ucode rate bitmask */ 831 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 832 struct rs_rate *rate) 833 { 834 u32 ucode_rate = 0; 835 int index = rate->index; 836 837 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 838 RATE_MCS_ANT_ABC_MSK); 839 840 if (is_legacy(rate)) { 841 ucode_rate |= iwl_rates[index].plcp; 842 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 843 ucode_rate |= RATE_MCS_CCK_MSK; 844 return ucode_rate; 845 } 846 847 if (is_ht(rate)) { 848 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 849 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 850 index = IWL_LAST_HT_RATE; 851 } 852 ucode_rate |= RATE_MCS_HT_MSK; 853 854 if (is_ht_siso(rate)) 855 ucode_rate |= iwl_rates[index].plcp_ht_siso; 856 else if (is_ht_mimo2(rate)) 857 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 858 else 859 WARN_ON_ONCE(1); 860 } else if (is_vht(rate)) { 861 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 862 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 863 index = IWL_LAST_VHT_RATE; 864 } 865 ucode_rate |= RATE_MCS_VHT_MSK; 866 if (is_vht_siso(rate)) 867 ucode_rate |= iwl_rates[index].plcp_vht_siso; 868 else if (is_vht_mimo2(rate)) 869 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 870 else 871 WARN_ON_ONCE(1); 872 873 } else { 874 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 875 } 876 877 if (is_siso(rate) && rate->stbc) { 878 /* To enable STBC we need to set both a flag and ANT_AB */ 879 ucode_rate |= RATE_MCS_ANT_AB_MSK; 880 ucode_rate |= RATE_MCS_STBC_MSK; 881 } 882 883 ucode_rate |= rate->bw; 884 if (rate->sgi) 885 ucode_rate |= RATE_MCS_SGI_MSK; 886 if (rate->ldpc) 887 ucode_rate |= RATE_MCS_LDPC_MSK; 888 889 return ucode_rate; 890 } 891 892 /* Convert a ucode rate into an rs_rate object */ 893 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 894 enum nl80211_band band, 895 struct rs_rate *rate) 896 { 897 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 898 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 899 u8 nss; 900 901 memset(rate, 0, sizeof(*rate)); 902 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 903 904 if (rate->index == IWL_RATE_INVALID) 905 return -EINVAL; 906 907 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 908 909 /* Legacy */ 910 if (!(ucode_rate & RATE_MCS_HT_MSK) && 911 !(ucode_rate & RATE_MCS_VHT_MSK)) { 912 if (num_of_ant == 1) { 913 if (band == NL80211_BAND_5GHZ) 914 rate->type = LQ_LEGACY_A; 915 else 916 rate->type = LQ_LEGACY_G; 917 } 918 919 return 0; 920 } 921 922 /* HT or VHT */ 923 if (ucode_rate & RATE_MCS_SGI_MSK) 924 rate->sgi = true; 925 if (ucode_rate & RATE_MCS_LDPC_MSK) 926 rate->ldpc = true; 927 if (ucode_rate & RATE_MCS_STBC_MSK) 928 rate->stbc = true; 929 if (ucode_rate & RATE_MCS_BF_MSK) 930 rate->bfer = true; 931 932 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 933 934 if (ucode_rate & RATE_MCS_HT_MSK) { 935 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 936 RATE_HT_MCS_NSS_POS) + 1; 937 938 if (nss == 1) { 939 rate->type = LQ_HT_SISO; 940 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 941 "stbc %d bfer %d", 942 rate->stbc, rate->bfer); 943 } else if (nss == 2) { 944 rate->type = LQ_HT_MIMO2; 945 WARN_ON_ONCE(num_of_ant != 2); 946 } else { 947 WARN_ON_ONCE(1); 948 } 949 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 950 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 951 RATE_VHT_MCS_NSS_POS) + 1; 952 953 if (nss == 1) { 954 rate->type = LQ_VHT_SISO; 955 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 956 "stbc %d bfer %d", 957 rate->stbc, rate->bfer); 958 } else if (nss == 2) { 959 rate->type = LQ_VHT_MIMO2; 960 WARN_ON_ONCE(num_of_ant != 2); 961 } else { 962 WARN_ON_ONCE(1); 963 } 964 } 965 966 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 967 !is_vht(rate)); 968 969 return 0; 970 } 971 972 /* switch to another antenna/antennas and return 1 */ 973 /* if no other valid antenna found, return 0 */ 974 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 975 { 976 u8 new_ant_type; 977 978 if (!rate->ant || rate->ant > ANT_ABC) 979 return 0; 980 981 if (!rs_is_valid_ant(valid_ant, rate->ant)) 982 return 0; 983 984 new_ant_type = ant_toggle_lookup[rate->ant]; 985 986 while ((new_ant_type != rate->ant) && 987 !rs_is_valid_ant(valid_ant, new_ant_type)) 988 new_ant_type = ant_toggle_lookup[new_ant_type]; 989 990 if (new_ant_type == rate->ant) 991 return 0; 992 993 rate->ant = new_ant_type; 994 995 return 1; 996 } 997 998 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 999 struct rs_rate *rate) 1000 { 1001 if (is_legacy(rate)) 1002 return lq_sta->active_legacy_rate; 1003 else if (is_siso(rate)) 1004 return lq_sta->active_siso_rate; 1005 else if (is_mimo2(rate)) 1006 return lq_sta->active_mimo2_rate; 1007 1008 WARN_ON_ONCE(1); 1009 return 0; 1010 } 1011 1012 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1013 int rate_type) 1014 { 1015 u8 high = IWL_RATE_INVALID; 1016 u8 low = IWL_RATE_INVALID; 1017 1018 /* 802.11A or ht walks to the next literal adjacent rate in 1019 * the rate table */ 1020 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1021 int i; 1022 u32 mask; 1023 1024 /* Find the previous rate that is in the rate mask */ 1025 i = index - 1; 1026 if (i >= 0) 1027 mask = BIT(i); 1028 for (; i >= 0; i--, mask >>= 1) { 1029 if (rate_mask & mask) { 1030 low = i; 1031 break; 1032 } 1033 } 1034 1035 /* Find the next rate that is in the rate mask */ 1036 i = index + 1; 1037 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1038 if (rate_mask & mask) { 1039 high = i; 1040 break; 1041 } 1042 } 1043 1044 return (high << 8) | low; 1045 } 1046 1047 low = index; 1048 while (low != IWL_RATE_INVALID) { 1049 low = iwl_rates[low].prev_rs; 1050 if (low == IWL_RATE_INVALID) 1051 break; 1052 if (rate_mask & (1 << low)) 1053 break; 1054 } 1055 1056 high = index; 1057 while (high != IWL_RATE_INVALID) { 1058 high = iwl_rates[high].next_rs; 1059 if (high == IWL_RATE_INVALID) 1060 break; 1061 if (rate_mask & (1 << high)) 1062 break; 1063 } 1064 1065 return (high << 8) | low; 1066 } 1067 1068 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1069 struct rs_rate *rate) 1070 { 1071 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1072 } 1073 1074 /* Get the next supported lower rate in the current column. 1075 * Return true if bottom rate in the current column was reached 1076 */ 1077 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1078 struct rs_rate *rate) 1079 { 1080 u8 low; 1081 u16 high_low; 1082 u16 rate_mask; 1083 struct iwl_mvm *mvm = lq_sta->pers.drv; 1084 1085 rate_mask = rs_get_supported_rates(lq_sta, rate); 1086 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1087 rate->type); 1088 low = high_low & 0xff; 1089 1090 /* Bottom rate of column reached */ 1091 if (low == IWL_RATE_INVALID) 1092 return true; 1093 1094 rate->index = low; 1095 return false; 1096 } 1097 1098 /* Get the next rate to use following a column downgrade */ 1099 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1100 struct rs_rate *rate) 1101 { 1102 struct iwl_mvm *mvm = lq_sta->pers.drv; 1103 1104 if (is_legacy(rate)) { 1105 /* No column to downgrade from Legacy */ 1106 return; 1107 } else if (is_siso(rate)) { 1108 /* Downgrade to Legacy if we were in SISO */ 1109 if (lq_sta->band == NL80211_BAND_5GHZ) 1110 rate->type = LQ_LEGACY_A; 1111 else 1112 rate->type = LQ_LEGACY_G; 1113 1114 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1115 1116 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1117 rate->index > IWL_RATE_MCS_9_INDEX); 1118 1119 rate->index = rs_ht_to_legacy[rate->index]; 1120 rate->ldpc = false; 1121 } else { 1122 /* Downgrade to SISO with same MCS if in MIMO */ 1123 rate->type = is_vht_mimo2(rate) ? 1124 LQ_VHT_SISO : LQ_HT_SISO; 1125 } 1126 1127 if (num_of_ant(rate->ant) > 1) 1128 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1129 1130 /* Relevant in both switching to SISO or Legacy */ 1131 rate->sgi = false; 1132 1133 if (!rs_rate_supported(lq_sta, rate)) 1134 rs_get_lower_rate_in_column(lq_sta, rate); 1135 } 1136 1137 /* Check if both rates share the same column */ 1138 static inline bool rs_rate_column_match(struct rs_rate *a, 1139 struct rs_rate *b) 1140 { 1141 bool ant_match; 1142 1143 if (a->stbc || a->bfer) 1144 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1145 else 1146 ant_match = (a->ant == b->ant); 1147 1148 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1149 && ant_match; 1150 } 1151 1152 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1153 { 1154 if (is_legacy(rate)) { 1155 if (rate->ant == ANT_A) 1156 return RS_COLUMN_LEGACY_ANT_A; 1157 1158 if (rate->ant == ANT_B) 1159 return RS_COLUMN_LEGACY_ANT_B; 1160 1161 goto err; 1162 } 1163 1164 if (is_siso(rate)) { 1165 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1166 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1167 RS_COLUMN_SISO_ANT_A; 1168 1169 if (rate->ant == ANT_B) 1170 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1171 RS_COLUMN_SISO_ANT_B; 1172 1173 goto err; 1174 } 1175 1176 if (is_mimo(rate)) 1177 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1178 1179 err: 1180 return RS_COLUMN_INVALID; 1181 } 1182 1183 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1184 { 1185 u8 tid = IWL_MAX_TID_COUNT; 1186 1187 if (ieee80211_is_data_qos(hdr->frame_control)) { 1188 u8 *qc = ieee80211_get_qos_ctl(hdr); 1189 tid = qc[0] & 0xf; 1190 } 1191 1192 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1193 tid = IWL_MAX_TID_COUNT; 1194 1195 return tid; 1196 } 1197 1198 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1199 int tid, struct ieee80211_tx_info *info, bool ndp) 1200 { 1201 int legacy_success; 1202 int retries; 1203 int i; 1204 struct iwl_lq_cmd *table; 1205 u32 lq_hwrate; 1206 struct rs_rate lq_rate, tx_resp_rate; 1207 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1208 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1209 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1210 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1211 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1212 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1213 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1214 1215 /* Treat uninitialized rate scaling data same as non-existing. */ 1216 if (!lq_sta) { 1217 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1218 return; 1219 } else if (!lq_sta->pers.drv) { 1220 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1221 return; 1222 } 1223 1224 /* This packet was aggregated but doesn't carry status info */ 1225 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1226 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1227 return; 1228 1229 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1230 1231 #ifdef CONFIG_MAC80211_DEBUGFS 1232 /* Disable last tx check if we are debugging with fixed rate but 1233 * update tx stats */ 1234 if (lq_sta->pers.dbg_fixed_rate) { 1235 int index = tx_resp_rate.index; 1236 enum rs_column column; 1237 int attempts, success; 1238 1239 column = rs_get_column_from_rate(&tx_resp_rate); 1240 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1241 "Can't map rate 0x%x to column", 1242 tx_resp_hwrate)) 1243 return; 1244 1245 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1246 attempts = info->status.ampdu_len; 1247 success = info->status.ampdu_ack_len; 1248 } else { 1249 attempts = info->status.rates[0].count; 1250 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1251 } 1252 1253 lq_sta->pers.tx_stats[column][index].total += attempts; 1254 lq_sta->pers.tx_stats[column][index].success += success; 1255 1256 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1257 tx_resp_hwrate, success, attempts); 1258 return; 1259 } 1260 #endif 1261 1262 if (time_after(jiffies, 1263 (unsigned long)(lq_sta->last_tx + 1264 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1265 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1266 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1267 return; 1268 } 1269 lq_sta->last_tx = jiffies; 1270 1271 /* Ignore this Tx frame response if its initial rate doesn't match 1272 * that of latest Link Quality command. There may be stragglers 1273 * from a previous Link Quality command, but we're no longer interested 1274 * in those; they're either from the "active" mode while we're trying 1275 * to check "search" mode, or a prior "search" mode after we've moved 1276 * to a new "search" mode (which might become the new "active" mode). 1277 */ 1278 table = &lq_sta->lq; 1279 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1280 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1281 1282 /* Here we actually compare this rate to the latest LQ command */ 1283 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1284 IWL_DEBUG_RATE(mvm, 1285 "tx resp color 0x%x does not match 0x%x\n", 1286 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1287 1288 /* 1289 * Since rates mis-match, the last LQ command may have failed. 1290 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1291 * ... driver. 1292 */ 1293 lq_sta->missed_rate_counter++; 1294 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1295 lq_sta->missed_rate_counter = 0; 1296 IWL_DEBUG_RATE(mvm, 1297 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1298 lq_sta->rs_state); 1299 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1300 } 1301 /* Regardless, ignore this status info for outdated rate */ 1302 return; 1303 } else 1304 /* Rate did match, so reset the missed_rate_counter */ 1305 lq_sta->missed_rate_counter = 0; 1306 1307 if (!lq_sta->search_better_tbl) { 1308 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1309 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1310 } else { 1311 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1312 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1313 } 1314 1315 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1316 IWL_DEBUG_RATE(mvm, 1317 "Neither active nor search matches tx rate\n"); 1318 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1319 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1320 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1321 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1322 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1323 1324 /* 1325 * no matching table found, let's by-pass the data collection 1326 * and continue to perform rate scale to find the rate table 1327 */ 1328 rs_stay_in_table(lq_sta, true); 1329 goto done; 1330 } 1331 1332 /* 1333 * Updating the frame history depends on whether packets were 1334 * aggregated. 1335 * 1336 * For aggregation, all packets were transmitted at the same rate, the 1337 * first index into rate scale table. 1338 */ 1339 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1340 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1341 info->status.ampdu_len, 1342 info->status.ampdu_ack_len, 1343 reduced_txp); 1344 1345 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1346 * it as a single frame loss as we don't want the success ratio 1347 * to dip too quickly because a BA wasn't received. 1348 * For TPC, there's no need for this optimisation since we want 1349 * to recover very quickly from a bad power reduction and, 1350 * therefore we'd like the success ratio to get an immediate hit 1351 * when failing to get a BA, so we'd switch back to a lower or 1352 * zero power reduction. When FW transmits agg with a rate 1353 * different from the initial rate, it will not use reduced txp 1354 * and will send BA notification twice (one empty with reduced 1355 * txp equal to the value from LQ and one with reduced txp 0). 1356 * We need to update counters for each txp level accordingly. 1357 */ 1358 if (info->status.ampdu_ack_len == 0) 1359 info->status.ampdu_len = 1; 1360 1361 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1362 info->status.ampdu_len, 1363 info->status.ampdu_ack_len); 1364 1365 /* Update success/fail counts if not searching for new mode */ 1366 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1367 lq_sta->total_success += info->status.ampdu_ack_len; 1368 lq_sta->total_failed += (info->status.ampdu_len - 1369 info->status.ampdu_ack_len); 1370 } 1371 } else { 1372 /* For legacy, update frame history with for each Tx retry. */ 1373 retries = info->status.rates[0].count - 1; 1374 /* HW doesn't send more than 15 retries */ 1375 retries = min(retries, 15); 1376 1377 /* The last transmission may have been successful */ 1378 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1379 /* Collect data for each rate used during failed TX attempts */ 1380 for (i = 0; i <= retries; ++i) { 1381 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1382 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1383 &lq_rate); 1384 /* 1385 * Only collect stats if retried rate is in the same RS 1386 * table as active/search. 1387 */ 1388 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1389 tmp_tbl = curr_tbl; 1390 else if (rs_rate_column_match(&lq_rate, 1391 &other_tbl->rate)) 1392 tmp_tbl = other_tbl; 1393 else 1394 continue; 1395 1396 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1397 tx_resp_rate.index, 1, 1398 i < retries ? 0 : legacy_success, 1399 reduced_txp); 1400 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1401 tx_resp_rate.index, 1, 1402 i < retries ? 0 : legacy_success); 1403 } 1404 1405 /* Update success/fail counts if not searching for new mode */ 1406 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1407 lq_sta->total_success += legacy_success; 1408 lq_sta->total_failed += retries + (1 - legacy_success); 1409 } 1410 } 1411 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1412 lq_sta->last_rate_n_flags = lq_hwrate; 1413 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1414 done: 1415 /* See if there's a better rate or modulation mode to try. */ 1416 if (sta->supp_rates[info->band]) 1417 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1418 } 1419 1420 /* 1421 * mac80211 sends us Tx status 1422 */ 1423 static void rs_mac80211_tx_status(void *mvm_r, 1424 struct ieee80211_supported_band *sband, 1425 struct ieee80211_sta *sta, void *priv_sta, 1426 struct sk_buff *skb) 1427 { 1428 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1429 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1430 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1432 1433 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1434 return; 1435 1436 if (!ieee80211_is_data(hdr->frame_control) || 1437 info->flags & IEEE80211_TX_CTL_NO_ACK) 1438 return; 1439 1440 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1441 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1442 } 1443 1444 /* 1445 * Begin a period of staying with a selected modulation mode. 1446 * Set "stay_in_tbl" flag to prevent any mode switches. 1447 * Set frame tx success limits according to legacy vs. high-throughput, 1448 * and reset overall (spanning all rates) tx success history statistics. 1449 * These control how long we stay using same modulation mode before 1450 * searching for a new mode. 1451 */ 1452 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1453 struct iwl_lq_sta *lq_sta) 1454 { 1455 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1456 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1457 if (is_legacy) { 1458 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1459 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1460 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1461 } else { 1462 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1463 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1464 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1465 } 1466 lq_sta->table_count = 0; 1467 lq_sta->total_failed = 0; 1468 lq_sta->total_success = 0; 1469 lq_sta->flush_timer = jiffies; 1470 lq_sta->visited_columns = 0; 1471 } 1472 1473 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1474 { 1475 if (rate_mask) 1476 return find_last_bit(&rate_mask, BITS_PER_LONG); 1477 return IWL_RATE_INVALID; 1478 } 1479 1480 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1481 const struct rs_tx_column *column) 1482 { 1483 switch (column->mode) { 1484 case RS_LEGACY: 1485 return lq_sta->max_legacy_rate_idx; 1486 case RS_SISO: 1487 return lq_sta->max_siso_rate_idx; 1488 case RS_MIMO2: 1489 return lq_sta->max_mimo2_rate_idx; 1490 default: 1491 WARN_ON_ONCE(1); 1492 } 1493 1494 return lq_sta->max_legacy_rate_idx; 1495 } 1496 1497 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1498 const struct rs_tx_column *column, 1499 u32 bw) 1500 { 1501 /* Used to choose among HT tables */ 1502 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1503 1504 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1505 column->mode != RS_SISO && 1506 column->mode != RS_MIMO2)) 1507 return expected_tpt_legacy; 1508 1509 /* Legacy rates have only one table */ 1510 if (column->mode == RS_LEGACY) 1511 return expected_tpt_legacy; 1512 1513 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1514 /* Choose among many HT tables depending on number of streams 1515 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1516 * status */ 1517 if (column->mode == RS_SISO) { 1518 switch (bw) { 1519 case RATE_MCS_CHAN_WIDTH_20: 1520 ht_tbl_pointer = expected_tpt_siso_20MHz; 1521 break; 1522 case RATE_MCS_CHAN_WIDTH_40: 1523 ht_tbl_pointer = expected_tpt_siso_40MHz; 1524 break; 1525 case RATE_MCS_CHAN_WIDTH_80: 1526 ht_tbl_pointer = expected_tpt_siso_80MHz; 1527 break; 1528 case RATE_MCS_CHAN_WIDTH_160: 1529 ht_tbl_pointer = expected_tpt_siso_160MHz; 1530 break; 1531 default: 1532 WARN_ON_ONCE(1); 1533 } 1534 } else if (column->mode == RS_MIMO2) { 1535 switch (bw) { 1536 case RATE_MCS_CHAN_WIDTH_20: 1537 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1538 break; 1539 case RATE_MCS_CHAN_WIDTH_40: 1540 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1541 break; 1542 case RATE_MCS_CHAN_WIDTH_80: 1543 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1544 break; 1545 case RATE_MCS_CHAN_WIDTH_160: 1546 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1547 break; 1548 default: 1549 WARN_ON_ONCE(1); 1550 } 1551 } else { 1552 WARN_ON_ONCE(1); 1553 } 1554 1555 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1556 return ht_tbl_pointer[0]; 1557 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1558 return ht_tbl_pointer[1]; 1559 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1560 return ht_tbl_pointer[2]; 1561 else /* AGG+SGI */ 1562 return ht_tbl_pointer[3]; 1563 } 1564 1565 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1566 struct iwl_scale_tbl_info *tbl) 1567 { 1568 struct rs_rate *rate = &tbl->rate; 1569 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1570 1571 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1572 } 1573 1574 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1575 struct iwl_lq_sta *lq_sta, 1576 struct iwl_scale_tbl_info *tbl, /* "search" */ 1577 unsigned long rate_mask, s8 index) 1578 { 1579 struct iwl_scale_tbl_info *active_tbl = 1580 &(lq_sta->lq_info[lq_sta->active_tbl]); 1581 s32 success_ratio = active_tbl->win[index].success_ratio; 1582 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1583 const u16 *tpt_tbl = tbl->expected_tpt; 1584 u16 high_low; 1585 u32 target_tpt; 1586 int rate_idx; 1587 1588 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1589 target_tpt = 100 * expected_current_tpt; 1590 IWL_DEBUG_RATE(mvm, 1591 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1592 success_ratio, target_tpt); 1593 } else { 1594 target_tpt = lq_sta->last_tpt; 1595 IWL_DEBUG_RATE(mvm, 1596 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1597 success_ratio, target_tpt); 1598 } 1599 1600 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1601 1602 while (rate_idx != IWL_RATE_INVALID) { 1603 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1604 break; 1605 1606 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1607 tbl->rate.type); 1608 1609 rate_idx = (high_low >> 8) & 0xff; 1610 } 1611 1612 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1613 rate_idx, target_tpt, 1614 rate_idx != IWL_RATE_INVALID ? 1615 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1616 1617 return rate_idx; 1618 } 1619 1620 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1621 { 1622 switch (sta->bandwidth) { 1623 case IEEE80211_STA_RX_BW_160: 1624 return RATE_MCS_CHAN_WIDTH_160; 1625 case IEEE80211_STA_RX_BW_80: 1626 return RATE_MCS_CHAN_WIDTH_80; 1627 case IEEE80211_STA_RX_BW_40: 1628 return RATE_MCS_CHAN_WIDTH_40; 1629 case IEEE80211_STA_RX_BW_20: 1630 default: 1631 return RATE_MCS_CHAN_WIDTH_20; 1632 } 1633 } 1634 1635 /* 1636 * Check whether we should continue using same modulation mode, or 1637 * begin search for a new mode, based on: 1638 * 1) # tx successes or failures while using this mode 1639 * 2) # times calling this function 1640 * 3) elapsed time in this mode (not used, for now) 1641 */ 1642 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1643 { 1644 struct iwl_scale_tbl_info *tbl; 1645 int active_tbl; 1646 int flush_interval_passed = 0; 1647 struct iwl_mvm *mvm; 1648 1649 mvm = lq_sta->pers.drv; 1650 active_tbl = lq_sta->active_tbl; 1651 1652 tbl = &(lq_sta->lq_info[active_tbl]); 1653 1654 /* If we've been disallowing search, see if we should now allow it */ 1655 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1656 /* Elapsed time using current modulation mode */ 1657 if (lq_sta->flush_timer) 1658 flush_interval_passed = 1659 time_after(jiffies, 1660 (unsigned long)(lq_sta->flush_timer + 1661 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1662 1663 /* 1664 * Check if we should allow search for new modulation mode. 1665 * If many frames have failed or succeeded, or we've used 1666 * this same modulation for a long time, allow search, and 1667 * reset history stats that keep track of whether we should 1668 * allow a new search. Also (below) reset all bitmaps and 1669 * stats in active history. 1670 */ 1671 if (force_search || 1672 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1673 (lq_sta->total_success > lq_sta->max_success_limit) || 1674 ((!lq_sta->search_better_tbl) && 1675 (lq_sta->flush_timer) && (flush_interval_passed))) { 1676 IWL_DEBUG_RATE(mvm, 1677 "LQ: stay is expired %d %d %d\n", 1678 lq_sta->total_failed, 1679 lq_sta->total_success, 1680 flush_interval_passed); 1681 1682 /* Allow search for new mode */ 1683 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1684 IWL_DEBUG_RATE(mvm, 1685 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1686 lq_sta->total_failed = 0; 1687 lq_sta->total_success = 0; 1688 lq_sta->flush_timer = 0; 1689 /* mark the current column as visited */ 1690 lq_sta->visited_columns = BIT(tbl->column); 1691 /* 1692 * Else if we've used this modulation mode enough repetitions 1693 * (regardless of elapsed time or success/failure), reset 1694 * history bitmaps and rate-specific stats for all rates in 1695 * active table. 1696 */ 1697 } else { 1698 lq_sta->table_count++; 1699 if (lq_sta->table_count >= 1700 lq_sta->table_count_limit) { 1701 lq_sta->table_count = 0; 1702 1703 IWL_DEBUG_RATE(mvm, 1704 "LQ: stay in table clear win\n"); 1705 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1706 } 1707 } 1708 1709 /* If transitioning to allow "search", reset all history 1710 * bitmaps and stats in active table (this will become the new 1711 * "search" table). */ 1712 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1713 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1714 } 1715 } 1716 } 1717 1718 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1719 struct iwl_scale_tbl_info *tbl, 1720 enum rs_action scale_action) 1721 { 1722 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1723 1724 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1725 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1726 scale_action == RS_ACTION_DOWNSCALE) 1727 mvmsta->tlc_amsdu = false; 1728 else 1729 mvmsta->tlc_amsdu = true; 1730 } 1731 1732 /* 1733 * setup rate table in uCode 1734 */ 1735 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1736 struct ieee80211_sta *sta, 1737 struct iwl_lq_sta *lq_sta, 1738 struct iwl_scale_tbl_info *tbl) 1739 { 1740 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1741 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1742 } 1743 1744 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1745 struct ieee80211_sta *sta, 1746 struct iwl_lq_sta *lq_sta, 1747 struct iwl_scale_tbl_info *tbl, 1748 enum rs_action scale_action) 1749 { 1750 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1751 return false; 1752 1753 if (!is_vht_siso(&tbl->rate)) 1754 return false; 1755 1756 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1757 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1758 (scale_action == RS_ACTION_DOWNSCALE)) { 1759 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1760 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1761 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1762 goto tweaked; 1763 } 1764 1765 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1766 * sustainable, i.e. we're past the test window. We can't go back 1767 * if MCS5 is just tested as this will happen always after switching 1768 * to 20Mhz MCS4 because the rate stats are cleared. 1769 */ 1770 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1771 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1772 (scale_action == RS_ACTION_STAY)) || 1773 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1774 (scale_action == RS_ACTION_UPSCALE)))) { 1775 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1776 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1777 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1778 goto tweaked; 1779 } 1780 1781 return false; 1782 1783 tweaked: 1784 rs_set_expected_tpt_table(lq_sta, tbl); 1785 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1786 return true; 1787 } 1788 1789 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1790 struct iwl_lq_sta *lq_sta, 1791 struct ieee80211_sta *sta, 1792 struct iwl_scale_tbl_info *tbl) 1793 { 1794 int i, j, max_rate; 1795 enum rs_column next_col_id; 1796 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1797 const struct rs_tx_column *next_col; 1798 allow_column_func_t allow_func; 1799 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1800 const u16 *expected_tpt_tbl; 1801 u16 tpt, max_expected_tpt; 1802 1803 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1804 next_col_id = curr_col->next_columns[i]; 1805 1806 if (next_col_id == RS_COLUMN_INVALID) 1807 continue; 1808 1809 if (lq_sta->visited_columns & BIT(next_col_id)) { 1810 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1811 next_col_id); 1812 continue; 1813 } 1814 1815 next_col = &rs_tx_columns[next_col_id]; 1816 1817 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1818 IWL_DEBUG_RATE(mvm, 1819 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1820 next_col_id, valid_ants, next_col->ant); 1821 continue; 1822 } 1823 1824 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1825 allow_func = next_col->checks[j]; 1826 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1827 next_col)) 1828 break; 1829 } 1830 1831 if (j != MAX_COLUMN_CHECKS) { 1832 IWL_DEBUG_RATE(mvm, 1833 "Skip column %d: not allowed (check %d failed)\n", 1834 next_col_id, j); 1835 1836 continue; 1837 } 1838 1839 tpt = lq_sta->last_tpt / 100; 1840 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1841 rs_bw_from_sta_bw(sta)); 1842 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1843 continue; 1844 1845 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1846 if (max_rate == IWL_RATE_INVALID) { 1847 IWL_DEBUG_RATE(mvm, 1848 "Skip column %d: no rate is allowed in this column\n", 1849 next_col_id); 1850 continue; 1851 } 1852 1853 max_expected_tpt = expected_tpt_tbl[max_rate]; 1854 if (tpt >= max_expected_tpt) { 1855 IWL_DEBUG_RATE(mvm, 1856 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1857 next_col_id, max_expected_tpt, tpt); 1858 continue; 1859 } 1860 1861 IWL_DEBUG_RATE(mvm, 1862 "Found potential column %d. Max expected %d current %d\n", 1863 next_col_id, max_expected_tpt, tpt); 1864 break; 1865 } 1866 1867 if (i == MAX_NEXT_COLUMNS) 1868 return RS_COLUMN_INVALID; 1869 1870 return next_col_id; 1871 } 1872 1873 static int rs_switch_to_column(struct iwl_mvm *mvm, 1874 struct iwl_lq_sta *lq_sta, 1875 struct ieee80211_sta *sta, 1876 enum rs_column col_id) 1877 { 1878 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1879 struct iwl_scale_tbl_info *search_tbl = 1880 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1881 struct rs_rate *rate = &search_tbl->rate; 1882 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1883 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1884 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1885 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1886 unsigned long rate_mask = 0; 1887 u32 rate_idx = 0; 1888 1889 memcpy(search_tbl, tbl, sz); 1890 1891 rate->sgi = column->sgi; 1892 rate->ant = column->ant; 1893 1894 if (column->mode == RS_LEGACY) { 1895 if (lq_sta->band == NL80211_BAND_5GHZ) 1896 rate->type = LQ_LEGACY_A; 1897 else 1898 rate->type = LQ_LEGACY_G; 1899 1900 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1901 rate->ldpc = false; 1902 rate_mask = lq_sta->active_legacy_rate; 1903 } else if (column->mode == RS_SISO) { 1904 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1905 rate_mask = lq_sta->active_siso_rate; 1906 } else if (column->mode == RS_MIMO2) { 1907 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1908 rate_mask = lq_sta->active_mimo2_rate; 1909 } else { 1910 WARN_ONCE(1, "Bad column mode"); 1911 } 1912 1913 if (column->mode != RS_LEGACY) { 1914 rate->bw = rs_bw_from_sta_bw(sta); 1915 rate->ldpc = lq_sta->ldpc; 1916 } 1917 1918 search_tbl->column = col_id; 1919 rs_set_expected_tpt_table(lq_sta, search_tbl); 1920 1921 lq_sta->visited_columns |= BIT(col_id); 1922 1923 /* Get the best matching rate if we're changing modes. e.g. 1924 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1925 */ 1926 if (curr_column->mode != column->mode) { 1927 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1928 rate_mask, rate->index); 1929 1930 if ((rate_idx == IWL_RATE_INVALID) || 1931 !(BIT(rate_idx) & rate_mask)) { 1932 IWL_DEBUG_RATE(mvm, 1933 "can not switch with index %d" 1934 " rate mask %lx\n", 1935 rate_idx, rate_mask); 1936 1937 goto err; 1938 } 1939 1940 rate->index = rate_idx; 1941 } 1942 1943 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1944 col_id, rate->index); 1945 1946 return 0; 1947 1948 err: 1949 rate->type = LQ_NONE; 1950 return -1; 1951 } 1952 1953 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1954 struct iwl_scale_tbl_info *tbl, 1955 s32 sr, int low, int high, 1956 int current_tpt, 1957 int low_tpt, int high_tpt) 1958 { 1959 enum rs_action action = RS_ACTION_STAY; 1960 1961 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1962 (current_tpt == 0)) { 1963 IWL_DEBUG_RATE(mvm, 1964 "Decrease rate because of low SR\n"); 1965 return RS_ACTION_DOWNSCALE; 1966 } 1967 1968 if ((low_tpt == IWL_INVALID_VALUE) && 1969 (high_tpt == IWL_INVALID_VALUE) && 1970 (high != IWL_RATE_INVALID)) { 1971 IWL_DEBUG_RATE(mvm, 1972 "No data about high/low rates. Increase rate\n"); 1973 return RS_ACTION_UPSCALE; 1974 } 1975 1976 if ((high_tpt == IWL_INVALID_VALUE) && 1977 (high != IWL_RATE_INVALID) && 1978 (low_tpt != IWL_INVALID_VALUE) && 1979 (low_tpt < current_tpt)) { 1980 IWL_DEBUG_RATE(mvm, 1981 "No data about high rate and low rate is worse. Increase rate\n"); 1982 return RS_ACTION_UPSCALE; 1983 } 1984 1985 if ((high_tpt != IWL_INVALID_VALUE) && 1986 (high_tpt > current_tpt)) { 1987 IWL_DEBUG_RATE(mvm, 1988 "Higher rate is better. Increate rate\n"); 1989 return RS_ACTION_UPSCALE; 1990 } 1991 1992 if ((low_tpt != IWL_INVALID_VALUE) && 1993 (high_tpt != IWL_INVALID_VALUE) && 1994 (low_tpt < current_tpt) && 1995 (high_tpt < current_tpt)) { 1996 IWL_DEBUG_RATE(mvm, 1997 "Both high and low are worse. Maintain rate\n"); 1998 return RS_ACTION_STAY; 1999 } 2000 2001 if ((low_tpt != IWL_INVALID_VALUE) && 2002 (low_tpt > current_tpt)) { 2003 IWL_DEBUG_RATE(mvm, 2004 "Lower rate is better\n"); 2005 action = RS_ACTION_DOWNSCALE; 2006 goto out; 2007 } 2008 2009 if ((low_tpt == IWL_INVALID_VALUE) && 2010 (low != IWL_RATE_INVALID)) { 2011 IWL_DEBUG_RATE(mvm, 2012 "No data about lower rate\n"); 2013 action = RS_ACTION_DOWNSCALE; 2014 goto out; 2015 } 2016 2017 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2018 2019 out: 2020 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2021 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2022 IWL_DEBUG_RATE(mvm, 2023 "SR is above NO DECREASE. Avoid downscale\n"); 2024 action = RS_ACTION_STAY; 2025 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2026 IWL_DEBUG_RATE(mvm, 2027 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2028 action = RS_ACTION_STAY; 2029 } else { 2030 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2031 } 2032 } 2033 2034 return action; 2035 } 2036 2037 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2038 struct iwl_lq_sta *lq_sta) 2039 { 2040 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2041 * supports STBC of at least 1*SS 2042 */ 2043 if (!lq_sta->stbc_capable) 2044 return false; 2045 2046 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2047 return false; 2048 2049 return true; 2050 } 2051 2052 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2053 int *weaker, int *stronger) 2054 { 2055 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2056 if (*weaker > TPC_MAX_REDUCTION) 2057 *weaker = TPC_INVALID; 2058 2059 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2060 if (*stronger < 0) 2061 *stronger = TPC_INVALID; 2062 } 2063 2064 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2065 struct rs_rate *rate, enum nl80211_band band) 2066 { 2067 int index = rate->index; 2068 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2069 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2070 !vif->bss_conf.ps); 2071 2072 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2073 cam, sta_ps_disabled); 2074 /* 2075 * allow tpc only if power management is enabled, or bt coex 2076 * activity grade allows it and we are on 2.4Ghz. 2077 */ 2078 if ((cam || sta_ps_disabled) && 2079 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2080 return false; 2081 2082 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2083 if (is_legacy(rate)) 2084 return index == IWL_RATE_54M_INDEX; 2085 if (is_ht(rate)) 2086 return index == IWL_RATE_MCS_7_INDEX; 2087 if (is_vht(rate)) 2088 return index == IWL_RATE_MCS_7_INDEX || 2089 index == IWL_RATE_MCS_8_INDEX || 2090 index == IWL_RATE_MCS_9_INDEX; 2091 2092 WARN_ON_ONCE(1); 2093 return false; 2094 } 2095 2096 enum tpc_action { 2097 TPC_ACTION_STAY, 2098 TPC_ACTION_DECREASE, 2099 TPC_ACTION_INCREASE, 2100 TPC_ACTION_NO_RESTIRCTION, 2101 }; 2102 2103 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2104 s32 sr, int weak, int strong, 2105 int current_tpt, 2106 int weak_tpt, int strong_tpt) 2107 { 2108 /* stay until we have valid tpt */ 2109 if (current_tpt == IWL_INVALID_VALUE) { 2110 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2111 return TPC_ACTION_STAY; 2112 } 2113 2114 /* Too many failures, increase txp */ 2115 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2116 current_tpt == 0) { 2117 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2118 return TPC_ACTION_NO_RESTIRCTION; 2119 } 2120 2121 /* try decreasing first if applicable */ 2122 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2123 weak != TPC_INVALID) { 2124 if (weak_tpt == IWL_INVALID_VALUE && 2125 (strong_tpt == IWL_INVALID_VALUE || 2126 current_tpt >= strong_tpt)) { 2127 IWL_DEBUG_RATE(mvm, 2128 "no weak txp measurement. decrease txp\n"); 2129 return TPC_ACTION_DECREASE; 2130 } 2131 2132 if (weak_tpt > current_tpt) { 2133 IWL_DEBUG_RATE(mvm, 2134 "lower txp has better tpt. decrease txp\n"); 2135 return TPC_ACTION_DECREASE; 2136 } 2137 } 2138 2139 /* next, increase if needed */ 2140 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2141 strong != TPC_INVALID) { 2142 if (weak_tpt == IWL_INVALID_VALUE && 2143 strong_tpt != IWL_INVALID_VALUE && 2144 current_tpt < strong_tpt) { 2145 IWL_DEBUG_RATE(mvm, 2146 "higher txp has better tpt. increase txp\n"); 2147 return TPC_ACTION_INCREASE; 2148 } 2149 2150 if (weak_tpt < current_tpt && 2151 (strong_tpt == IWL_INVALID_VALUE || 2152 strong_tpt > current_tpt)) { 2153 IWL_DEBUG_RATE(mvm, 2154 "lower txp has worse tpt. increase txp\n"); 2155 return TPC_ACTION_INCREASE; 2156 } 2157 } 2158 2159 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2160 return TPC_ACTION_STAY; 2161 } 2162 2163 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2164 struct ieee80211_sta *sta, 2165 struct iwl_lq_sta *lq_sta, 2166 struct iwl_scale_tbl_info *tbl) 2167 { 2168 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2169 struct ieee80211_vif *vif = mvm_sta->vif; 2170 struct ieee80211_chanctx_conf *chanctx_conf; 2171 enum nl80211_band band; 2172 struct iwl_rate_scale_data *window; 2173 struct rs_rate *rate = &tbl->rate; 2174 enum tpc_action action; 2175 s32 sr; 2176 u8 cur = lq_sta->lq.reduced_tpc; 2177 int current_tpt; 2178 int weak, strong; 2179 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2180 2181 #ifdef CONFIG_MAC80211_DEBUGFS 2182 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2183 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2184 lq_sta->pers.dbg_fixed_txp_reduction); 2185 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2186 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2187 } 2188 #endif 2189 2190 rcu_read_lock(); 2191 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2192 if (WARN_ON(!chanctx_conf)) 2193 band = NUM_NL80211_BANDS; 2194 else 2195 band = chanctx_conf->def.chan->band; 2196 rcu_read_unlock(); 2197 2198 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2199 IWL_DEBUG_RATE(mvm, 2200 "tpc is not allowed. remove txp restrictions\n"); 2201 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2202 return cur != TPC_NO_REDUCTION; 2203 } 2204 2205 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2206 2207 /* Collect measured throughputs for current and adjacent rates */ 2208 window = tbl->tpc_win; 2209 sr = window[cur].success_ratio; 2210 current_tpt = window[cur].average_tpt; 2211 if (weak != TPC_INVALID) 2212 weak_tpt = window[weak].average_tpt; 2213 if (strong != TPC_INVALID) 2214 strong_tpt = window[strong].average_tpt; 2215 2216 IWL_DEBUG_RATE(mvm, 2217 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2218 cur, current_tpt, sr, weak, strong, 2219 weak_tpt, strong_tpt); 2220 2221 action = rs_get_tpc_action(mvm, sr, weak, strong, 2222 current_tpt, weak_tpt, strong_tpt); 2223 2224 /* override actions if we are on the edge */ 2225 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2226 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2227 action = TPC_ACTION_STAY; 2228 } else if (strong == TPC_INVALID && 2229 (action == TPC_ACTION_INCREASE || 2230 action == TPC_ACTION_NO_RESTIRCTION)) { 2231 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2232 action = TPC_ACTION_STAY; 2233 } 2234 2235 switch (action) { 2236 case TPC_ACTION_DECREASE: 2237 lq_sta->lq.reduced_tpc = weak; 2238 return true; 2239 case TPC_ACTION_INCREASE: 2240 lq_sta->lq.reduced_tpc = strong; 2241 return true; 2242 case TPC_ACTION_NO_RESTIRCTION: 2243 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2244 return true; 2245 case TPC_ACTION_STAY: 2246 /* do nothing */ 2247 break; 2248 } 2249 return false; 2250 } 2251 2252 /* 2253 * Do rate scaling and search for new modulation mode. 2254 */ 2255 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2256 struct ieee80211_sta *sta, 2257 struct iwl_lq_sta *lq_sta, 2258 int tid, bool ndp) 2259 { 2260 int low = IWL_RATE_INVALID; 2261 int high = IWL_RATE_INVALID; 2262 int index; 2263 struct iwl_rate_scale_data *window = NULL; 2264 int current_tpt = IWL_INVALID_VALUE; 2265 int low_tpt = IWL_INVALID_VALUE; 2266 int high_tpt = IWL_INVALID_VALUE; 2267 u32 fail_count; 2268 enum rs_action scale_action = RS_ACTION_STAY; 2269 u16 rate_mask; 2270 u8 update_lq = 0; 2271 struct iwl_scale_tbl_info *tbl, *tbl1; 2272 u8 active_tbl = 0; 2273 u8 done_search = 0; 2274 u16 high_low; 2275 s32 sr; 2276 u8 prev_agg = lq_sta->is_agg; 2277 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2278 struct rs_rate *rate; 2279 2280 lq_sta->is_agg = !!mvmsta->agg_tids; 2281 2282 /* 2283 * Select rate-scale / modulation-mode table to work with in 2284 * the rest of this function: "search" if searching for better 2285 * modulation mode, or "active" if doing rate scaling within a mode. 2286 */ 2287 if (!lq_sta->search_better_tbl) 2288 active_tbl = lq_sta->active_tbl; 2289 else 2290 active_tbl = 1 - lq_sta->active_tbl; 2291 2292 tbl = &(lq_sta->lq_info[active_tbl]); 2293 rate = &tbl->rate; 2294 2295 if (prev_agg != lq_sta->is_agg) { 2296 IWL_DEBUG_RATE(mvm, 2297 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2298 prev_agg, lq_sta->is_agg); 2299 rs_set_expected_tpt_table(lq_sta, tbl); 2300 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2301 } 2302 2303 /* current tx rate */ 2304 index = rate->index; 2305 2306 /* rates available for this association, and for modulation mode */ 2307 rate_mask = rs_get_supported_rates(lq_sta, rate); 2308 2309 if (!(BIT(index) & rate_mask)) { 2310 IWL_ERR(mvm, "Current Rate is not valid\n"); 2311 if (lq_sta->search_better_tbl) { 2312 /* revert to active table if search table is not valid*/ 2313 rate->type = LQ_NONE; 2314 lq_sta->search_better_tbl = 0; 2315 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2316 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2317 } 2318 return; 2319 } 2320 2321 /* Get expected throughput table and history window for current rate */ 2322 if (!tbl->expected_tpt) { 2323 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2324 return; 2325 } 2326 2327 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2328 window = &(tbl->win[index]); 2329 2330 /* 2331 * If there is not enough history to calculate actual average 2332 * throughput, keep analyzing results of more tx frames, without 2333 * changing rate or mode (bypass most of the rest of this function). 2334 * Set up new rate table in uCode only if old rate is not supported 2335 * in current association (use new rate found above). 2336 */ 2337 fail_count = window->counter - window->success_counter; 2338 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2339 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2340 IWL_DEBUG_RATE(mvm, 2341 "%s: Test Window: succ %d total %d\n", 2342 rs_pretty_rate(rate), 2343 window->success_counter, window->counter); 2344 2345 /* Can't calculate this yet; not enough history */ 2346 window->average_tpt = IWL_INVALID_VALUE; 2347 2348 /* Should we stay with this modulation mode, 2349 * or search for a new one? */ 2350 rs_stay_in_table(lq_sta, false); 2351 2352 return; 2353 } 2354 2355 /* If we are searching for better modulation mode, check success. */ 2356 if (lq_sta->search_better_tbl) { 2357 /* If good success, continue using the "search" mode; 2358 * no need to send new link quality command, since we're 2359 * continuing to use the setup that we've been trying. */ 2360 if (window->average_tpt > lq_sta->last_tpt) { 2361 IWL_DEBUG_RATE(mvm, 2362 "SWITCHING TO NEW TABLE SR: %d " 2363 "cur-tpt %d old-tpt %d\n", 2364 window->success_ratio, 2365 window->average_tpt, 2366 lq_sta->last_tpt); 2367 2368 /* Swap tables; "search" becomes "active" */ 2369 lq_sta->active_tbl = active_tbl; 2370 current_tpt = window->average_tpt; 2371 /* Else poor success; go back to mode in "active" table */ 2372 } else { 2373 IWL_DEBUG_RATE(mvm, 2374 "GOING BACK TO THE OLD TABLE: SR %d " 2375 "cur-tpt %d old-tpt %d\n", 2376 window->success_ratio, 2377 window->average_tpt, 2378 lq_sta->last_tpt); 2379 2380 /* Nullify "search" table */ 2381 rate->type = LQ_NONE; 2382 2383 /* Revert to "active" table */ 2384 active_tbl = lq_sta->active_tbl; 2385 tbl = &(lq_sta->lq_info[active_tbl]); 2386 2387 /* Revert to "active" rate and throughput info */ 2388 index = tbl->rate.index; 2389 current_tpt = lq_sta->last_tpt; 2390 2391 /* Need to set up a new rate table in uCode */ 2392 update_lq = 1; 2393 } 2394 2395 /* Either way, we've made a decision; modulation mode 2396 * search is done, allow rate adjustment next time. */ 2397 lq_sta->search_better_tbl = 0; 2398 done_search = 1; /* Don't switch modes below! */ 2399 goto lq_update; 2400 } 2401 2402 /* (Else) not in search of better modulation mode, try for better 2403 * starting rate, while staying in this mode. */ 2404 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2405 low = high_low & 0xff; 2406 high = (high_low >> 8) & 0xff; 2407 2408 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2409 2410 sr = window->success_ratio; 2411 2412 /* Collect measured throughputs for current and adjacent rates */ 2413 current_tpt = window->average_tpt; 2414 if (low != IWL_RATE_INVALID) 2415 low_tpt = tbl->win[low].average_tpt; 2416 if (high != IWL_RATE_INVALID) 2417 high_tpt = tbl->win[high].average_tpt; 2418 2419 IWL_DEBUG_RATE(mvm, 2420 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2421 rs_pretty_rate(rate), current_tpt, sr, 2422 low, high, low_tpt, high_tpt); 2423 2424 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2425 current_tpt, low_tpt, high_tpt); 2426 2427 /* Force a search in case BT doesn't like us being in MIMO */ 2428 if (is_mimo(rate) && 2429 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2430 IWL_DEBUG_RATE(mvm, 2431 "BT Coex forbids MIMO. Search for new config\n"); 2432 rs_stay_in_table(lq_sta, true); 2433 goto lq_update; 2434 } 2435 2436 switch (scale_action) { 2437 case RS_ACTION_DOWNSCALE: 2438 /* Decrease starting rate, update uCode's rate table */ 2439 if (low != IWL_RATE_INVALID) { 2440 update_lq = 1; 2441 index = low; 2442 } else { 2443 IWL_DEBUG_RATE(mvm, 2444 "At the bottom rate. Can't decrease\n"); 2445 } 2446 2447 break; 2448 case RS_ACTION_UPSCALE: 2449 /* Increase starting rate, update uCode's rate table */ 2450 if (high != IWL_RATE_INVALID) { 2451 update_lq = 1; 2452 index = high; 2453 } else { 2454 IWL_DEBUG_RATE(mvm, 2455 "At the top rate. Can't increase\n"); 2456 } 2457 2458 break; 2459 case RS_ACTION_STAY: 2460 /* No change */ 2461 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2462 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2463 break; 2464 default: 2465 break; 2466 } 2467 2468 lq_update: 2469 /* Replace uCode's rate table for the destination station. */ 2470 if (update_lq) { 2471 tbl->rate.index = index; 2472 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2473 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2474 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2475 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2476 } 2477 2478 rs_stay_in_table(lq_sta, false); 2479 2480 /* 2481 * Search for new modulation mode if we're: 2482 * 1) Not changing rates right now 2483 * 2) Not just finishing up a search 2484 * 3) Allowing a new search 2485 */ 2486 if (!update_lq && !done_search && 2487 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2488 && window->counter) { 2489 enum rs_column next_column; 2490 2491 /* Save current throughput to compare with "search" throughput*/ 2492 lq_sta->last_tpt = current_tpt; 2493 2494 IWL_DEBUG_RATE(mvm, 2495 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2496 update_lq, done_search, lq_sta->rs_state, 2497 window->counter); 2498 2499 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2500 if (next_column != RS_COLUMN_INVALID) { 2501 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2502 next_column); 2503 if (!ret) 2504 lq_sta->search_better_tbl = 1; 2505 } else { 2506 IWL_DEBUG_RATE(mvm, 2507 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2508 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2509 } 2510 2511 /* If new "search" mode was selected, set up in uCode table */ 2512 if (lq_sta->search_better_tbl) { 2513 /* Access the "search" table, clear its history. */ 2514 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2515 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2516 2517 /* Use new "search" start rate */ 2518 index = tbl->rate.index; 2519 2520 rs_dump_rate(mvm, &tbl->rate, 2521 "Switch to SEARCH TABLE:"); 2522 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2523 } else { 2524 done_search = 1; 2525 } 2526 } 2527 2528 if (!ndp) 2529 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2530 2531 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2532 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2533 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2534 } 2535 } 2536 2537 struct rs_init_rate_info { 2538 s8 rssi; 2539 u8 rate_idx; 2540 }; 2541 2542 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2543 { -60, IWL_RATE_54M_INDEX }, 2544 { -64, IWL_RATE_48M_INDEX }, 2545 { -68, IWL_RATE_36M_INDEX }, 2546 { -80, IWL_RATE_24M_INDEX }, 2547 { -84, IWL_RATE_18M_INDEX }, 2548 { -85, IWL_RATE_12M_INDEX }, 2549 { -86, IWL_RATE_11M_INDEX }, 2550 { -88, IWL_RATE_5M_INDEX }, 2551 { -90, IWL_RATE_2M_INDEX }, 2552 { S8_MIN, IWL_RATE_1M_INDEX }, 2553 }; 2554 2555 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2556 { -60, IWL_RATE_54M_INDEX }, 2557 { -64, IWL_RATE_48M_INDEX }, 2558 { -72, IWL_RATE_36M_INDEX }, 2559 { -80, IWL_RATE_24M_INDEX }, 2560 { -84, IWL_RATE_18M_INDEX }, 2561 { -85, IWL_RATE_12M_INDEX }, 2562 { -87, IWL_RATE_9M_INDEX }, 2563 { S8_MIN, IWL_RATE_6M_INDEX }, 2564 }; 2565 2566 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2567 { -60, IWL_RATE_MCS_7_INDEX }, 2568 { -64, IWL_RATE_MCS_6_INDEX }, 2569 { -68, IWL_RATE_MCS_5_INDEX }, 2570 { -72, IWL_RATE_MCS_4_INDEX }, 2571 { -80, IWL_RATE_MCS_3_INDEX }, 2572 { -84, IWL_RATE_MCS_2_INDEX }, 2573 { -85, IWL_RATE_MCS_1_INDEX }, 2574 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2575 }; 2576 2577 /* MCS index 9 is not valid for 20MHz VHT channel width, 2578 * but is ok for 40, 80 and 160MHz channels. 2579 */ 2580 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2581 { -60, IWL_RATE_MCS_8_INDEX }, 2582 { -64, IWL_RATE_MCS_7_INDEX }, 2583 { -68, IWL_RATE_MCS_6_INDEX }, 2584 { -72, IWL_RATE_MCS_5_INDEX }, 2585 { -80, IWL_RATE_MCS_4_INDEX }, 2586 { -84, IWL_RATE_MCS_3_INDEX }, 2587 { -85, IWL_RATE_MCS_2_INDEX }, 2588 { -87, IWL_RATE_MCS_1_INDEX }, 2589 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2590 }; 2591 2592 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2593 { -60, IWL_RATE_MCS_9_INDEX }, 2594 { -64, IWL_RATE_MCS_8_INDEX }, 2595 { -68, IWL_RATE_MCS_7_INDEX }, 2596 { -72, IWL_RATE_MCS_6_INDEX }, 2597 { -80, IWL_RATE_MCS_5_INDEX }, 2598 { -84, IWL_RATE_MCS_4_INDEX }, 2599 { -85, IWL_RATE_MCS_3_INDEX }, 2600 { -87, IWL_RATE_MCS_2_INDEX }, 2601 { -88, IWL_RATE_MCS_1_INDEX }, 2602 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2603 }; 2604 2605 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2606 2607 /* Init the optimal rate based on STA caps 2608 * This combined with rssi is used to report the last tx rate 2609 * to userspace when we haven't transmitted enough frames. 2610 */ 2611 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2612 struct ieee80211_sta *sta, 2613 struct iwl_lq_sta *lq_sta) 2614 { 2615 struct rs_rate *rate = &lq_sta->optimal_rate; 2616 2617 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2618 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2619 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2620 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2621 else if (lq_sta->band == NL80211_BAND_5GHZ) 2622 rate->type = LQ_LEGACY_A; 2623 else 2624 rate->type = LQ_LEGACY_G; 2625 2626 rate->bw = rs_bw_from_sta_bw(sta); 2627 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2628 2629 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2630 2631 if (is_mimo(rate)) { 2632 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2633 } else if (is_siso(rate)) { 2634 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2635 } else { 2636 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2637 2638 if (lq_sta->band == NL80211_BAND_5GHZ) { 2639 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2640 lq_sta->optimal_nentries = 2641 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2642 } else { 2643 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2644 lq_sta->optimal_nentries = 2645 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2646 } 2647 } 2648 2649 if (is_vht(rate)) { 2650 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2651 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2652 lq_sta->optimal_nentries = 2653 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2654 } else { 2655 lq_sta->optimal_rates = rs_optimal_rates_vht; 2656 lq_sta->optimal_nentries = 2657 ARRAY_SIZE(rs_optimal_rates_vht); 2658 } 2659 } else if (is_ht(rate)) { 2660 lq_sta->optimal_rates = rs_optimal_rates_ht; 2661 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2662 } 2663 } 2664 2665 /* Compute the optimal rate index based on RSSI */ 2666 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2667 struct iwl_lq_sta *lq_sta) 2668 { 2669 struct rs_rate *rate = &lq_sta->optimal_rate; 2670 int i; 2671 2672 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2673 BITS_PER_LONG); 2674 2675 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2676 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2677 2678 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2679 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2680 rate->index = rate_idx; 2681 break; 2682 } 2683 } 2684 2685 return rate; 2686 } 2687 2688 /* Choose an initial legacy rate and antenna to use based on the RSSI 2689 * of last Rx 2690 */ 2691 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2692 struct ieee80211_sta *sta, 2693 struct iwl_lq_sta *lq_sta, 2694 enum nl80211_band band, 2695 struct rs_rate *rate) 2696 { 2697 int i, nentries; 2698 unsigned long active_rate; 2699 s8 best_rssi = S8_MIN; 2700 u8 best_ant = ANT_NONE; 2701 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2702 const struct rs_init_rate_info *initial_rates; 2703 2704 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2705 if (!(lq_sta->pers.chains & BIT(i))) 2706 continue; 2707 2708 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2709 best_rssi = lq_sta->pers.chain_signal[i]; 2710 best_ant = BIT(i); 2711 } 2712 } 2713 2714 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2715 rs_pretty_ant(best_ant), best_rssi); 2716 2717 if (best_ant != ANT_A && best_ant != ANT_B) 2718 rate->ant = first_antenna(valid_tx_ant); 2719 else 2720 rate->ant = best_ant; 2721 2722 rate->sgi = false; 2723 rate->ldpc = false; 2724 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2725 2726 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2727 BITS_PER_LONG); 2728 2729 if (band == NL80211_BAND_5GHZ) { 2730 rate->type = LQ_LEGACY_A; 2731 initial_rates = rs_optimal_rates_5ghz_legacy; 2732 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2733 } else { 2734 rate->type = LQ_LEGACY_G; 2735 initial_rates = rs_optimal_rates_24ghz_legacy; 2736 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2737 } 2738 2739 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2740 goto out; 2741 2742 /* Start from a higher rate if the corresponding debug capability 2743 * is enabled. The rate is chosen according to AP capabilities. 2744 * In case of VHT/HT when the rssi is low fallback to the case of 2745 * legacy rates. 2746 */ 2747 if (sta->vht_cap.vht_supported && 2748 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2749 switch (sta->bandwidth) { 2750 case IEEE80211_STA_RX_BW_160: 2751 case IEEE80211_STA_RX_BW_80: 2752 case IEEE80211_STA_RX_BW_40: 2753 initial_rates = rs_optimal_rates_vht; 2754 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2755 break; 2756 case IEEE80211_STA_RX_BW_20: 2757 initial_rates = rs_optimal_rates_vht_20mhz; 2758 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2759 break; 2760 default: 2761 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2762 goto out; 2763 } 2764 2765 active_rate = lq_sta->active_siso_rate; 2766 rate->type = LQ_VHT_SISO; 2767 rate->bw = rs_bw_from_sta_bw(sta); 2768 } else if (sta->ht_cap.ht_supported && 2769 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2770 initial_rates = rs_optimal_rates_ht; 2771 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2772 active_rate = lq_sta->active_siso_rate; 2773 rate->type = LQ_HT_SISO; 2774 } else { 2775 active_rate = lq_sta->active_legacy_rate; 2776 } 2777 2778 for (i = 0; i < nentries; i++) { 2779 int rate_idx = initial_rates[i].rate_idx; 2780 2781 if ((best_rssi >= initial_rates[i].rssi) && 2782 (BIT(rate_idx) & active_rate)) { 2783 rate->index = rate_idx; 2784 break; 2785 } 2786 } 2787 2788 out: 2789 rs_dump_rate(mvm, rate, "INITIAL"); 2790 } 2791 2792 /* Save info about RSSI of last Rx */ 2793 void rs_update_last_rssi(struct iwl_mvm *mvm, 2794 struct iwl_lq_sta *lq_sta, 2795 struct ieee80211_rx_status *rx_status) 2796 { 2797 int i; 2798 2799 lq_sta->pers.chains = rx_status->chains; 2800 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2801 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2802 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2803 lq_sta->pers.last_rssi = S8_MIN; 2804 2805 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2806 if (!(lq_sta->pers.chains & BIT(i))) 2807 continue; 2808 2809 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2810 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2811 } 2812 } 2813 2814 /** 2815 * rs_initialize_lq - Initialize a station's hardware rate table 2816 * 2817 * The uCode's station table contains a table of fallback rates 2818 * for automatic fallback during transmission. 2819 * 2820 * NOTE: This sets up a default set of values. These will be replaced later 2821 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2822 * rc80211_simple. 2823 * 2824 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2825 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2826 * which requires station table entry to exist). 2827 */ 2828 static void rs_initialize_lq(struct iwl_mvm *mvm, 2829 struct ieee80211_sta *sta, 2830 struct iwl_lq_sta *lq_sta, 2831 enum nl80211_band band, 2832 bool init) 2833 { 2834 struct iwl_scale_tbl_info *tbl; 2835 struct rs_rate *rate; 2836 u8 active_tbl = 0; 2837 2838 if (!sta || !lq_sta) 2839 return; 2840 2841 if (!lq_sta->search_better_tbl) 2842 active_tbl = lq_sta->active_tbl; 2843 else 2844 active_tbl = 1 - lq_sta->active_tbl; 2845 2846 tbl = &(lq_sta->lq_info[active_tbl]); 2847 rate = &tbl->rate; 2848 2849 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2850 rs_init_optimal_rate(mvm, sta, lq_sta); 2851 2852 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2853 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2854 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2855 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2856 2857 tbl->column = rs_get_column_from_rate(rate); 2858 2859 rs_set_expected_tpt_table(lq_sta, tbl); 2860 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2861 /* TODO restore station should remember the lq cmd */ 2862 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2863 } 2864 2865 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2866 struct ieee80211_tx_rate_control *txrc) 2867 { 2868 struct sk_buff *skb = txrc->skb; 2869 struct iwl_op_mode *op_mode __maybe_unused = 2870 (struct iwl_op_mode *)mvm_r; 2871 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2872 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2873 struct iwl_lq_sta *lq_sta = mvm_sta; 2874 struct rs_rate *optimal_rate; 2875 u32 last_ucode_rate; 2876 2877 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2878 /* if vif isn't initialized mvm doesn't know about 2879 * this station, so don't do anything with the it 2880 */ 2881 sta = NULL; 2882 mvm_sta = NULL; 2883 } 2884 2885 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2886 2887 /* Treat uninitialized rate scaling data same as non-existing. */ 2888 if (lq_sta && !lq_sta->pers.drv) { 2889 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2890 mvm_sta = NULL; 2891 } 2892 2893 /* Send management frames and NO_ACK data using lowest rate. */ 2894 if (rate_control_send_low(sta, mvm_sta, txrc)) 2895 return; 2896 2897 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2898 info->band, &info->control.rates[0]); 2899 info->control.rates[0].count = 1; 2900 2901 /* Report the optimal rate based on rssi and STA caps if we haven't 2902 * converged yet (too little traffic) or exploring other modulations 2903 */ 2904 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2905 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2906 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2907 optimal_rate); 2908 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2909 &txrc->reported_rate); 2910 } 2911 } 2912 2913 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2914 gfp_t gfp) 2915 { 2916 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2917 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2918 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2919 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 2920 2921 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2922 2923 lq_sta->pers.drv = mvm; 2924 #ifdef CONFIG_MAC80211_DEBUGFS 2925 lq_sta->pers.dbg_fixed_rate = 0; 2926 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2927 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2928 #endif 2929 lq_sta->pers.chains = 0; 2930 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2931 lq_sta->pers.last_rssi = S8_MIN; 2932 2933 return &mvmsta->lq_sta; 2934 } 2935 2936 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2937 int nss) 2938 { 2939 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2940 (0x3 << (2 * (nss - 1))); 2941 rx_mcs >>= (2 * (nss - 1)); 2942 2943 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2944 return IWL_RATE_MCS_7_INDEX; 2945 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2946 return IWL_RATE_MCS_8_INDEX; 2947 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2948 return IWL_RATE_MCS_9_INDEX; 2949 2950 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2951 return -1; 2952 } 2953 2954 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2955 struct ieee80211_sta_vht_cap *vht_cap, 2956 struct iwl_lq_sta *lq_sta) 2957 { 2958 int i; 2959 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2960 2961 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2962 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2963 if (i == IWL_RATE_9M_INDEX) 2964 continue; 2965 2966 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2967 if (i == IWL_RATE_MCS_9_INDEX && 2968 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2969 continue; 2970 2971 lq_sta->active_siso_rate |= BIT(i); 2972 } 2973 } 2974 2975 if (sta->rx_nss < 2) 2976 return; 2977 2978 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2979 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2980 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2981 if (i == IWL_RATE_9M_INDEX) 2982 continue; 2983 2984 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2985 if (i == IWL_RATE_MCS_9_INDEX && 2986 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2987 continue; 2988 2989 lq_sta->active_mimo2_rate |= BIT(i); 2990 } 2991 } 2992 } 2993 2994 static void rs_ht_init(struct iwl_mvm *mvm, 2995 struct ieee80211_sta *sta, 2996 struct iwl_lq_sta *lq_sta, 2997 struct ieee80211_sta_ht_cap *ht_cap) 2998 { 2999 /* active_siso_rate mask includes 9 MBits (bit 5), 3000 * and CCK (bits 0-3), supp_rates[] does not; 3001 * shift to convert format, force 9 MBits off. 3002 */ 3003 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3004 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3005 lq_sta->active_siso_rate &= ~((u16)0x2); 3006 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3007 3008 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3009 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3010 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3011 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3012 3013 if (mvm->cfg->ht_params->ldpc && 3014 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3015 lq_sta->ldpc = true; 3016 3017 if (mvm->cfg->ht_params->stbc && 3018 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3019 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3020 lq_sta->stbc_capable = true; 3021 3022 lq_sta->is_vht = false; 3023 } 3024 3025 static void rs_vht_init(struct iwl_mvm *mvm, 3026 struct ieee80211_sta *sta, 3027 struct iwl_lq_sta *lq_sta, 3028 struct ieee80211_sta_vht_cap *vht_cap) 3029 { 3030 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3031 3032 if (mvm->cfg->ht_params->ldpc && 3033 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3034 lq_sta->ldpc = true; 3035 3036 if (mvm->cfg->ht_params->stbc && 3037 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3038 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3039 lq_sta->stbc_capable = true; 3040 3041 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3042 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3043 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3044 lq_sta->bfer_capable = true; 3045 3046 lq_sta->is_vht = true; 3047 } 3048 3049 #ifdef CONFIG_IWLWIFI_DEBUGFS 3050 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3051 { 3052 spin_lock_bh(&mvm->drv_stats_lock); 3053 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3054 spin_unlock_bh(&mvm->drv_stats_lock); 3055 } 3056 3057 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3058 { 3059 u8 nss = 0; 3060 3061 spin_lock(&mvm->drv_stats_lock); 3062 3063 if (agg) 3064 mvm->drv_rx_stats.agg_frames++; 3065 3066 mvm->drv_rx_stats.success_frames++; 3067 3068 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3069 case RATE_MCS_CHAN_WIDTH_20: 3070 mvm->drv_rx_stats.bw_20_frames++; 3071 break; 3072 case RATE_MCS_CHAN_WIDTH_40: 3073 mvm->drv_rx_stats.bw_40_frames++; 3074 break; 3075 case RATE_MCS_CHAN_WIDTH_80: 3076 mvm->drv_rx_stats.bw_80_frames++; 3077 break; 3078 case RATE_MCS_CHAN_WIDTH_160: 3079 mvm->drv_rx_stats.bw_160_frames++; 3080 break; 3081 default: 3082 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3083 } 3084 3085 if (rate & RATE_MCS_HT_MSK) { 3086 mvm->drv_rx_stats.ht_frames++; 3087 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3088 } else if (rate & RATE_MCS_VHT_MSK) { 3089 mvm->drv_rx_stats.vht_frames++; 3090 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3091 RATE_VHT_MCS_NSS_POS) + 1; 3092 } else { 3093 mvm->drv_rx_stats.legacy_frames++; 3094 } 3095 3096 if (nss == 1) 3097 mvm->drv_rx_stats.siso_frames++; 3098 else if (nss == 2) 3099 mvm->drv_rx_stats.mimo2_frames++; 3100 3101 if (rate & RATE_MCS_SGI_MSK) 3102 mvm->drv_rx_stats.sgi_frames++; 3103 else 3104 mvm->drv_rx_stats.ngi_frames++; 3105 3106 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3107 mvm->drv_rx_stats.last_frame_idx = 3108 (mvm->drv_rx_stats.last_frame_idx + 1) % 3109 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3110 3111 spin_unlock(&mvm->drv_stats_lock); 3112 } 3113 #endif 3114 3115 /* 3116 * Called after adding a new station to initialize rate scaling 3117 */ 3118 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3119 enum nl80211_band band, bool init) 3120 { 3121 int i, j; 3122 struct ieee80211_hw *hw = mvm->hw; 3123 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3124 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3125 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3126 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 3127 struct ieee80211_supported_band *sband; 3128 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3129 3130 /* clear all non-persistent lq data */ 3131 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3132 3133 sband = hw->wiphy->bands[band]; 3134 3135 lq_sta->lq.sta_id = mvmsta->sta_id; 3136 mvmsta->tlc_amsdu = false; 3137 3138 for (j = 0; j < LQ_SIZE; j++) 3139 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3140 3141 lq_sta->flush_timer = 0; 3142 lq_sta->last_tx = jiffies; 3143 3144 IWL_DEBUG_RATE(mvm, 3145 "LQ: *** rate scale station global init for station %d ***\n", 3146 mvmsta->sta_id); 3147 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3148 * the lowest or the highest rate.. Could consider using RSSI from 3149 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3150 * after assoc.. */ 3151 3152 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3153 lq_sta->band = sband->band; 3154 /* 3155 * active legacy rates as per supported rates bitmap 3156 */ 3157 supp = sta->supp_rates[sband->band]; 3158 lq_sta->active_legacy_rate = 0; 3159 for_each_set_bit(i, &supp, BITS_PER_LONG) 3160 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3161 3162 /* TODO: should probably account for rx_highest for both HT/VHT */ 3163 if (!vht_cap || !vht_cap->vht_supported) 3164 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3165 else 3166 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3167 3168 lq_sta->max_legacy_rate_idx = 3169 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3170 lq_sta->max_siso_rate_idx = 3171 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3172 lq_sta->max_mimo2_rate_idx = 3173 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3174 3175 IWL_DEBUG_RATE(mvm, 3176 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3177 lq_sta->active_legacy_rate, 3178 lq_sta->active_siso_rate, 3179 lq_sta->active_mimo2_rate, 3180 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3181 lq_sta->bfer_capable); 3182 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3183 lq_sta->max_legacy_rate_idx, 3184 lq_sta->max_siso_rate_idx, 3185 lq_sta->max_mimo2_rate_idx); 3186 3187 /* These values will be overridden later */ 3188 lq_sta->lq.single_stream_ant_msk = 3189 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3190 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3191 3192 /* as default allow aggregation for all tids */ 3193 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3194 lq_sta->is_agg = 0; 3195 #ifdef CONFIG_IWLWIFI_DEBUGFS 3196 iwl_mvm_reset_frame_stats(mvm); 3197 #endif 3198 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3199 } 3200 3201 static void rs_rate_update(void *mvm_r, 3202 struct ieee80211_supported_band *sband, 3203 struct cfg80211_chan_def *chandef, 3204 struct ieee80211_sta *sta, void *priv_sta, 3205 u32 changed) 3206 { 3207 u8 tid; 3208 struct iwl_op_mode *op_mode = 3209 (struct iwl_op_mode *)mvm_r; 3210 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3211 3212 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3213 return; 3214 3215 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3216 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3217 ieee80211_stop_tx_ba_session(sta, tid); 3218 3219 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3220 } 3221 3222 #ifdef CONFIG_MAC80211_DEBUGFS 3223 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3224 struct iwl_lq_cmd *lq_cmd, 3225 enum nl80211_band band, 3226 u32 ucode_rate) 3227 { 3228 struct rs_rate rate; 3229 int i; 3230 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3231 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3232 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3233 3234 for (i = 0; i < num_rates; i++) 3235 lq_cmd->rs_table[i] = ucode_rate_le32; 3236 3237 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3238 3239 if (is_mimo(&rate)) 3240 lq_cmd->mimo_delim = num_rates - 1; 3241 else 3242 lq_cmd->mimo_delim = 0; 3243 3244 lq_cmd->reduced_tpc = 0; 3245 3246 if (num_of_ant(ant) == 1) 3247 lq_cmd->single_stream_ant_msk = ant; 3248 3249 if (!mvm->trans->cfg->gen2) 3250 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3251 else 3252 lq_cmd->agg_frame_cnt_limit = 3253 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3254 } 3255 #endif /* CONFIG_MAC80211_DEBUGFS */ 3256 3257 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3258 struct iwl_lq_sta *lq_sta, 3259 struct rs_rate *rate, 3260 __le32 *rs_table, int *rs_table_index, 3261 int num_rates, int num_retries, 3262 u8 valid_tx_ant, bool toggle_ant) 3263 { 3264 int i, j; 3265 __le32 ucode_rate; 3266 bool bottom_reached = false; 3267 int prev_rate_idx = rate->index; 3268 int end = LINK_QUAL_MAX_RETRY_NUM; 3269 int index = *rs_table_index; 3270 3271 for (i = 0; i < num_rates && index < end; i++) { 3272 for (j = 0; j < num_retries && index < end; j++, index++) { 3273 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3274 rate)); 3275 rs_table[index] = ucode_rate; 3276 if (toggle_ant) 3277 rs_toggle_antenna(valid_tx_ant, rate); 3278 } 3279 3280 prev_rate_idx = rate->index; 3281 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3282 if (bottom_reached && !is_legacy(rate)) 3283 break; 3284 } 3285 3286 if (!bottom_reached && !is_legacy(rate)) 3287 rate->index = prev_rate_idx; 3288 3289 *rs_table_index = index; 3290 } 3291 3292 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3293 * column the rate table should look like this: 3294 * 3295 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3296 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3297 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3298 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3299 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3300 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3301 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3302 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3303 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3304 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3305 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3306 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3307 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3308 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3309 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3310 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3311 */ 3312 static void rs_build_rates_table(struct iwl_mvm *mvm, 3313 struct ieee80211_sta *sta, 3314 struct iwl_lq_sta *lq_sta, 3315 const struct rs_rate *initial_rate) 3316 { 3317 struct rs_rate rate; 3318 int num_rates, num_retries, index = 0; 3319 u8 valid_tx_ant = 0; 3320 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3321 bool toggle_ant = false; 3322 u32 color; 3323 3324 memcpy(&rate, initial_rate, sizeof(rate)); 3325 3326 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3327 3328 /* TODO: remove old API when min FW API hits 14 */ 3329 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3330 rs_stbc_allow(mvm, sta, lq_sta)) 3331 rate.stbc = true; 3332 3333 if (is_siso(&rate)) { 3334 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3335 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3336 } else if (is_mimo(&rate)) { 3337 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3338 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3339 } else { 3340 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3341 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3342 toggle_ant = true; 3343 } 3344 3345 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3346 num_rates, num_retries, valid_tx_ant, 3347 toggle_ant); 3348 3349 rs_get_lower_rate_down_column(lq_sta, &rate); 3350 3351 if (is_siso(&rate)) { 3352 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3353 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3354 lq_cmd->mimo_delim = index; 3355 } else if (is_legacy(&rate)) { 3356 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3357 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3358 } else { 3359 WARN_ON_ONCE(1); 3360 } 3361 3362 toggle_ant = true; 3363 3364 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3365 num_rates, num_retries, valid_tx_ant, 3366 toggle_ant); 3367 3368 rs_get_lower_rate_down_column(lq_sta, &rate); 3369 3370 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3371 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3372 3373 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3374 num_rates, num_retries, valid_tx_ant, 3375 toggle_ant); 3376 3377 /* update the color of the LQ command (as a counter at bits 1-3) */ 3378 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3379 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3380 } 3381 3382 struct rs_bfer_active_iter_data { 3383 struct ieee80211_sta *exclude_sta; 3384 struct iwl_mvm_sta *bfer_mvmsta; 3385 }; 3386 3387 static void rs_bfer_active_iter(void *_data, 3388 struct ieee80211_sta *sta) 3389 { 3390 struct rs_bfer_active_iter_data *data = _data; 3391 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3392 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3393 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3394 3395 if (sta == data->exclude_sta) 3396 return; 3397 3398 /* The current sta has BFER allowed */ 3399 if (ss_params & LQ_SS_BFER_ALLOWED) { 3400 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3401 3402 data->bfer_mvmsta = mvmsta; 3403 } 3404 } 3405 3406 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3407 { 3408 int prio = -1; 3409 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3410 3411 switch (viftype) { 3412 case NL80211_IFTYPE_AP: 3413 case NL80211_IFTYPE_P2P_GO: 3414 prio = 3; 3415 break; 3416 case NL80211_IFTYPE_P2P_CLIENT: 3417 prio = 2; 3418 break; 3419 case NL80211_IFTYPE_STATION: 3420 prio = 1; 3421 break; 3422 default: 3423 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3424 prio = -1; 3425 } 3426 3427 return prio; 3428 } 3429 3430 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3431 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3432 struct iwl_mvm_sta *sta2) 3433 { 3434 int prio1 = rs_bfer_priority(sta1); 3435 int prio2 = rs_bfer_priority(sta2); 3436 3437 if (prio1 > prio2) 3438 return 1; 3439 if (prio1 < prio2) 3440 return -1; 3441 return 0; 3442 } 3443 3444 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3445 struct ieee80211_sta *sta, 3446 struct iwl_lq_sta *lq_sta, 3447 const struct rs_rate *initial_rate) 3448 { 3449 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3450 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3451 struct rs_bfer_active_iter_data data = { 3452 .exclude_sta = sta, 3453 .bfer_mvmsta = NULL, 3454 }; 3455 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3456 u32 ss_params = LQ_SS_PARAMS_VALID; 3457 3458 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3459 goto out; 3460 3461 #ifdef CONFIG_MAC80211_DEBUGFS 3462 /* Check if forcing the decision is configured. 3463 * Note that SISO is forced by not allowing STBC or BFER 3464 */ 3465 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3466 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3467 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3468 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3469 3470 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3471 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3472 lq_sta->pers.ss_force); 3473 goto out; 3474 } 3475 #endif 3476 3477 if (lq_sta->stbc_capable) 3478 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3479 3480 if (!lq_sta->bfer_capable) 3481 goto out; 3482 3483 ieee80211_iterate_stations_atomic(mvm->hw, 3484 rs_bfer_active_iter, 3485 &data); 3486 bfer_mvmsta = data.bfer_mvmsta; 3487 3488 /* This code is safe as it doesn't run concurrently for different 3489 * stations. This is guaranteed by the fact that calls to 3490 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3491 */ 3492 if (!bfer_mvmsta) { 3493 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3494 3495 ss_params |= LQ_SS_BFER_ALLOWED; 3496 goto out; 3497 } 3498 3499 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3500 bfer_mvmsta->sta_id); 3501 3502 /* Disallow BFER on another STA if active and we're a higher priority */ 3503 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3504 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3505 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3506 3507 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3508 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3509 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3510 3511 ss_params |= LQ_SS_BFER_ALLOWED; 3512 IWL_DEBUG_RATE(mvm, 3513 "Lower priority BFER sta found (%d). Switch BFER\n", 3514 bfer_mvmsta->sta_id); 3515 } 3516 out: 3517 lq_cmd->ss_params = cpu_to_le32(ss_params); 3518 } 3519 3520 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3521 struct ieee80211_sta *sta, 3522 struct iwl_lq_sta *lq_sta, 3523 const struct rs_rate *initial_rate) 3524 { 3525 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3526 struct iwl_mvm_sta *mvmsta; 3527 struct iwl_mvm_vif *mvmvif; 3528 3529 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3530 lq_cmd->agg_time_limit = 3531 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3532 3533 #ifdef CONFIG_MAC80211_DEBUGFS 3534 if (lq_sta->pers.dbg_fixed_rate) { 3535 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3536 lq_sta->band, 3537 lq_sta->pers.dbg_fixed_rate); 3538 return; 3539 } 3540 #endif 3541 if (WARN_ON_ONCE(!sta || !initial_rate)) 3542 return; 3543 3544 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3545 3546 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3547 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3548 3549 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3550 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3551 3552 if (num_of_ant(initial_rate->ant) == 1) 3553 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3554 3555 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3556 3557 /* 3558 * In case of low latency, tell the firmware to leave a frame in the 3559 * Tx Fifo so that it can start a transaction in the same TxOP. This 3560 * basically allows the firmware to send bursts. 3561 */ 3562 if (iwl_mvm_vif_low_latency(mvmvif)) 3563 lq_cmd->agg_frame_cnt_limit--; 3564 3565 if (mvmsta->vif->p2p) 3566 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3567 3568 lq_cmd->agg_time_limit = 3569 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3570 } 3571 3572 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3573 { 3574 return hw->priv; 3575 } 3576 /* rate scale requires free function to be implemented */ 3577 static void rs_free(void *mvm_rate) 3578 { 3579 return; 3580 } 3581 3582 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3583 void *mvm_sta) 3584 { 3585 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3586 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3587 3588 IWL_DEBUG_RATE(mvm, "enter\n"); 3589 IWL_DEBUG_RATE(mvm, "leave\n"); 3590 } 3591 3592 #ifdef CONFIG_MAC80211_DEBUGFS 3593 int rs_pretty_print_rate(char *buf, const u32 rate) 3594 { 3595 3596 char *type, *bw; 3597 u8 mcs = 0, nss = 0; 3598 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3599 3600 if (!(rate & RATE_MCS_HT_MSK) && 3601 !(rate & RATE_MCS_VHT_MSK)) { 3602 int index = iwl_hwrate_to_plcp_idx(rate); 3603 3604 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3605 rs_pretty_ant(ant), 3606 index == IWL_RATE_INVALID ? "BAD" : 3607 iwl_rate_mcs[index].mbps); 3608 } 3609 3610 if (rate & RATE_MCS_VHT_MSK) { 3611 type = "VHT"; 3612 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3613 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3614 >> RATE_VHT_MCS_NSS_POS) + 1; 3615 } else if (rate & RATE_MCS_HT_MSK) { 3616 type = "HT"; 3617 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3618 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3619 >> RATE_HT_MCS_NSS_POS) + 1; 3620 } else { 3621 type = "Unknown"; /* shouldn't happen */ 3622 } 3623 3624 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3625 case RATE_MCS_CHAN_WIDTH_20: 3626 bw = "20Mhz"; 3627 break; 3628 case RATE_MCS_CHAN_WIDTH_40: 3629 bw = "40Mhz"; 3630 break; 3631 case RATE_MCS_CHAN_WIDTH_80: 3632 bw = "80Mhz"; 3633 break; 3634 case RATE_MCS_CHAN_WIDTH_160: 3635 bw = "160Mhz"; 3636 break; 3637 default: 3638 bw = "BAD BW"; 3639 } 3640 3641 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3642 type, rs_pretty_ant(ant), bw, mcs, nss, 3643 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3644 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3645 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3646 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3647 } 3648 3649 /** 3650 * Program the device to use fixed rate for frame transmit 3651 * This is for debugging/testing only 3652 * once the device start use fixed rate, we need to reload the module 3653 * to being back the normal operation. 3654 */ 3655 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3656 struct iwl_lq_sta *lq_sta) 3657 { 3658 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3659 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3660 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3661 3662 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3663 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3664 3665 if (lq_sta->pers.dbg_fixed_rate) { 3666 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3667 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3668 } 3669 } 3670 3671 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3672 const char __user *user_buf, size_t count, loff_t *ppos) 3673 { 3674 struct iwl_lq_sta *lq_sta = file->private_data; 3675 struct iwl_mvm *mvm; 3676 char buf[64]; 3677 size_t buf_size; 3678 u32 parsed_rate; 3679 3680 mvm = lq_sta->pers.drv; 3681 memset(buf, 0, sizeof(buf)); 3682 buf_size = min(count, sizeof(buf) - 1); 3683 if (copy_from_user(buf, user_buf, buf_size)) 3684 return -EFAULT; 3685 3686 if (sscanf(buf, "%x", &parsed_rate) == 1) 3687 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3688 else 3689 lq_sta->pers.dbg_fixed_rate = 0; 3690 3691 rs_program_fix_rate(mvm, lq_sta); 3692 3693 return count; 3694 } 3695 3696 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3697 char __user *user_buf, size_t count, loff_t *ppos) 3698 { 3699 char *buff; 3700 int desc = 0; 3701 int i = 0; 3702 ssize_t ret; 3703 3704 struct iwl_lq_sta *lq_sta = file->private_data; 3705 struct iwl_mvm_sta *mvmsta = 3706 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3707 struct iwl_mvm *mvm; 3708 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3709 struct rs_rate *rate = &tbl->rate; 3710 u32 ss_params; 3711 3712 mvm = lq_sta->pers.drv; 3713 buff = kmalloc(2048, GFP_KERNEL); 3714 if (!buff) 3715 return -ENOMEM; 3716 3717 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3718 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3719 lq_sta->total_failed, lq_sta->total_success, 3720 lq_sta->active_legacy_rate); 3721 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3722 lq_sta->pers.dbg_fixed_rate); 3723 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3724 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3725 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3726 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3727 desc += sprintf(buff+desc, "lq type %s\n", 3728 (is_legacy(rate)) ? "legacy" : 3729 is_vht(rate) ? "VHT" : "HT"); 3730 if (!is_legacy(rate)) { 3731 desc += sprintf(buff + desc, " %s", 3732 (is_siso(rate)) ? "SISO" : "MIMO2"); 3733 desc += sprintf(buff + desc, " %s", 3734 (is_ht20(rate)) ? "20MHz" : 3735 (is_ht40(rate)) ? "40MHz" : 3736 (is_ht80(rate)) ? "80MHz" : 3737 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3738 desc += sprintf(buff + desc, " %s %s %s %s\n", 3739 (rate->sgi) ? "SGI" : "NGI", 3740 (rate->ldpc) ? "LDPC" : "BCC", 3741 (lq_sta->is_agg) ? "AGG on" : "", 3742 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3743 } 3744 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3745 lq_sta->last_rate_n_flags); 3746 desc += sprintf(buff+desc, 3747 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3748 lq_sta->lq.flags, 3749 lq_sta->lq.mimo_delim, 3750 lq_sta->lq.single_stream_ant_msk, 3751 lq_sta->lq.dual_stream_ant_msk); 3752 3753 desc += sprintf(buff+desc, 3754 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3755 le16_to_cpu(lq_sta->lq.agg_time_limit), 3756 lq_sta->lq.agg_disable_start_th, 3757 lq_sta->lq.agg_frame_cnt_limit); 3758 3759 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3760 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3761 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3762 (ss_params & LQ_SS_PARAMS_VALID) ? 3763 "VALID" : "INVALID", 3764 (ss_params & LQ_SS_BFER_ALLOWED) ? 3765 ", BFER" : "", 3766 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3767 ", STBC" : "", 3768 (ss_params & LQ_SS_FORCE) ? 3769 ", FORCE" : ""); 3770 desc += sprintf(buff+desc, 3771 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3772 lq_sta->lq.initial_rate_index[0], 3773 lq_sta->lq.initial_rate_index[1], 3774 lq_sta->lq.initial_rate_index[2], 3775 lq_sta->lq.initial_rate_index[3]); 3776 3777 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3778 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3779 3780 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3781 desc += rs_pretty_print_rate(buff+desc, r); 3782 } 3783 3784 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3785 kfree(buff); 3786 return ret; 3787 } 3788 3789 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3790 .write = rs_sta_dbgfs_scale_table_write, 3791 .read = rs_sta_dbgfs_scale_table_read, 3792 .open = simple_open, 3793 .llseek = default_llseek, 3794 }; 3795 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3796 char __user *user_buf, size_t count, loff_t *ppos) 3797 { 3798 char *buff; 3799 int desc = 0; 3800 int i, j; 3801 ssize_t ret; 3802 struct iwl_scale_tbl_info *tbl; 3803 struct rs_rate *rate; 3804 struct iwl_lq_sta *lq_sta = file->private_data; 3805 3806 buff = kmalloc(1024, GFP_KERNEL); 3807 if (!buff) 3808 return -ENOMEM; 3809 3810 for (i = 0; i < LQ_SIZE; i++) { 3811 tbl = &(lq_sta->lq_info[i]); 3812 rate = &tbl->rate; 3813 desc += sprintf(buff+desc, 3814 "%s type=%d SGI=%d BW=%s DUP=0\n" 3815 "index=%d\n", 3816 lq_sta->active_tbl == i ? "*" : "x", 3817 rate->type, 3818 rate->sgi, 3819 is_ht20(rate) ? "20MHz" : 3820 is_ht40(rate) ? "40MHz" : 3821 is_ht80(rate) ? "80MHz" : 3822 is_ht160(rate) ? "160MHz" : "ERR", 3823 rate->index); 3824 for (j = 0; j < IWL_RATE_COUNT; j++) { 3825 desc += sprintf(buff+desc, 3826 "counter=%d success=%d %%=%d\n", 3827 tbl->win[j].counter, 3828 tbl->win[j].success_counter, 3829 tbl->win[j].success_ratio); 3830 } 3831 } 3832 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3833 kfree(buff); 3834 return ret; 3835 } 3836 3837 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3838 .read = rs_sta_dbgfs_stats_table_read, 3839 .open = simple_open, 3840 .llseek = default_llseek, 3841 }; 3842 3843 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3844 char __user *user_buf, 3845 size_t count, loff_t *ppos) 3846 { 3847 static const char * const column_name[] = { 3848 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3849 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3850 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3851 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3852 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3853 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3854 [RS_COLUMN_MIMO2] = "MIMO2", 3855 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3856 }; 3857 3858 static const char * const rate_name[] = { 3859 [IWL_RATE_1M_INDEX] = "1M", 3860 [IWL_RATE_2M_INDEX] = "2M", 3861 [IWL_RATE_5M_INDEX] = "5.5M", 3862 [IWL_RATE_11M_INDEX] = "11M", 3863 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3864 [IWL_RATE_9M_INDEX] = "9M", 3865 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3866 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3867 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3868 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3869 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3870 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3871 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3872 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3873 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3874 }; 3875 3876 char *buff, *pos, *endpos; 3877 int col, rate; 3878 ssize_t ret; 3879 struct iwl_lq_sta *lq_sta = file->private_data; 3880 struct rs_rate_stats *stats; 3881 static const size_t bufsz = 1024; 3882 3883 buff = kmalloc(bufsz, GFP_KERNEL); 3884 if (!buff) 3885 return -ENOMEM; 3886 3887 pos = buff; 3888 endpos = pos + bufsz; 3889 3890 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3891 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3892 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3893 pos += scnprintf(pos, endpos - pos, "\n"); 3894 3895 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3896 pos += scnprintf(pos, endpos - pos, 3897 "%s,", column_name[col]); 3898 3899 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3900 stats = &(lq_sta->pers.tx_stats[col][rate]); 3901 pos += scnprintf(pos, endpos - pos, 3902 "%llu/%llu,", 3903 stats->success, 3904 stats->total); 3905 } 3906 pos += scnprintf(pos, endpos - pos, "\n"); 3907 } 3908 3909 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3910 kfree(buff); 3911 return ret; 3912 } 3913 3914 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3915 const char __user *user_buf, 3916 size_t count, loff_t *ppos) 3917 { 3918 struct iwl_lq_sta *lq_sta = file->private_data; 3919 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3920 3921 return count; 3922 } 3923 3924 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3925 .read = rs_sta_dbgfs_drv_tx_stats_read, 3926 .write = rs_sta_dbgfs_drv_tx_stats_write, 3927 .open = simple_open, 3928 .llseek = default_llseek, 3929 }; 3930 3931 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3932 char __user *user_buf, 3933 size_t count, loff_t *ppos) 3934 { 3935 struct iwl_lq_sta *lq_sta = file->private_data; 3936 char buf[12]; 3937 int bufsz = sizeof(buf); 3938 int pos = 0; 3939 static const char * const ss_force_name[] = { 3940 [RS_SS_FORCE_NONE] = "none", 3941 [RS_SS_FORCE_STBC] = "stbc", 3942 [RS_SS_FORCE_BFER] = "bfer", 3943 [RS_SS_FORCE_SISO] = "siso", 3944 }; 3945 3946 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3947 ss_force_name[lq_sta->pers.ss_force]); 3948 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3949 } 3950 3951 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3952 size_t count, loff_t *ppos) 3953 { 3954 struct iwl_mvm *mvm = lq_sta->pers.drv; 3955 int ret = 0; 3956 3957 if (!strncmp("none", buf, 4)) { 3958 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3959 } else if (!strncmp("siso", buf, 4)) { 3960 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3961 } else if (!strncmp("stbc", buf, 4)) { 3962 if (lq_sta->stbc_capable) { 3963 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3964 } else { 3965 IWL_ERR(mvm, 3966 "can't force STBC. peer doesn't support\n"); 3967 ret = -EINVAL; 3968 } 3969 } else if (!strncmp("bfer", buf, 4)) { 3970 if (lq_sta->bfer_capable) { 3971 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3972 } else { 3973 IWL_ERR(mvm, 3974 "can't force BFER. peer doesn't support\n"); 3975 ret = -EINVAL; 3976 } 3977 } else { 3978 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3979 ret = -EINVAL; 3980 } 3981 return ret ?: count; 3982 } 3983 3984 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3985 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3986 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3987 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3988 &iwl_dbgfs_##name##_ops)) \ 3989 goto err; \ 3990 } while (0) 3991 3992 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3993 3994 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3995 { 3996 struct iwl_lq_sta *lq_sta = priv_sta; 3997 struct iwl_mvm_sta *mvmsta; 3998 3999 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 4000 4001 if (!mvmsta->vif) 4002 return; 4003 4004 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4005 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4006 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4007 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4008 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4009 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4010 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4011 &lq_sta->tx_agg_tid_en); 4012 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4013 &lq_sta->pers.dbg_fixed_txp_reduction); 4014 4015 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4016 return; 4017 err: 4018 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4019 } 4020 4021 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4022 { 4023 } 4024 #endif 4025 4026 /* 4027 * Initialization of rate scaling information is done by driver after 4028 * the station is added. Since mac80211 calls this function before a 4029 * station is added we ignore it. 4030 */ 4031 static void rs_rate_init_stub(void *mvm_r, 4032 struct ieee80211_supported_band *sband, 4033 struct cfg80211_chan_def *chandef, 4034 struct ieee80211_sta *sta, void *mvm_sta) 4035 { 4036 } 4037 4038 static const struct rate_control_ops rs_mvm_ops = { 4039 .name = RS_NAME, 4040 .tx_status = rs_mac80211_tx_status, 4041 .get_rate = rs_get_rate, 4042 .rate_init = rs_rate_init_stub, 4043 .alloc = rs_alloc, 4044 .free = rs_free, 4045 .alloc_sta = rs_alloc_sta, 4046 .free_sta = rs_free_sta, 4047 .rate_update = rs_rate_update, 4048 #ifdef CONFIG_MAC80211_DEBUGFS 4049 .add_sta_debugfs = rs_add_debugfs, 4050 .remove_sta_debugfs = rs_remove_debugfs, 4051 #endif 4052 }; 4053 4054 int iwl_mvm_rate_control_register(void) 4055 { 4056 return ieee80211_rate_control_register(&rs_mvm_ops); 4057 } 4058 4059 void iwl_mvm_rate_control_unregister(void) 4060 { 4061 ieee80211_rate_control_unregister(&rs_mvm_ops); 4062 } 4063 4064 /** 4065 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4066 * Tx protection, according to this request and previous requests, 4067 * and send the LQ command. 4068 * @mvmsta: The station 4069 * @enable: Enable Tx protection? 4070 */ 4071 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4072 bool enable) 4073 { 4074 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4075 4076 lockdep_assert_held(&mvm->mutex); 4077 4078 if (enable) { 4079 if (mvmsta->tx_protection == 0) 4080 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4081 mvmsta->tx_protection++; 4082 } else { 4083 mvmsta->tx_protection--; 4084 if (mvmsta->tx_protection == 0) 4085 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4086 } 4087 4088 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4089 } 4090