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