1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define RS_NAME "iwl-mvm-rs" 46 47 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 48 49 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 50 * Use this macro when dealing with thresholds consts set as a percentage 51 */ 52 #define RS_PERCENT(x) (128 * x) 53 54 static u8 rs_ht_to_legacy[] = { 55 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 56 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 57 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 58 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 59 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 60 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 61 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 62 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 63 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 64 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 65 }; 66 67 static const u8 ant_toggle_lookup[] = { 68 [ANT_NONE] = ANT_NONE, 69 [ANT_A] = ANT_B, 70 [ANT_B] = ANT_C, 71 [ANT_AB] = ANT_BC, 72 [ANT_C] = ANT_A, 73 [ANT_AC] = ANT_AB, 74 [ANT_BC] = ANT_AC, 75 [ANT_ABC] = ANT_ABC, 76 }; 77 78 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 79 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 80 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 81 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 82 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 83 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 84 IWL_RATE_##rp##M_INDEX, \ 85 IWL_RATE_##rn##M_INDEX } 86 87 #define IWL_DECLARE_MCS_RATE(s) \ 88 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 89 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 90 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 91 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 92 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 93 IWL_RATE_INVM_INDEX, \ 94 IWL_RATE_INVM_INDEX } 95 96 /* 97 * Parameter order: 98 * rate, ht rate, prev rate, next rate 99 * 100 * If there isn't a valid next or previous rate then INV is used which 101 * maps to IWL_RATE_INVALID 102 * 103 */ 104 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 105 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 106 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 107 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 108 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 109 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 110 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 111 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 112 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 113 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 114 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 115 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 116 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 117 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 118 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 119 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 120 }; 121 122 enum rs_action { 123 RS_ACTION_STAY = 0, 124 RS_ACTION_DOWNSCALE = -1, 125 RS_ACTION_UPSCALE = 1, 126 }; 127 128 enum rs_column_mode { 129 RS_INVALID = 0, 130 RS_LEGACY, 131 RS_SISO, 132 RS_MIMO2, 133 }; 134 135 #define MAX_NEXT_COLUMNS 7 136 #define MAX_COLUMN_CHECKS 3 137 138 struct rs_tx_column; 139 140 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 141 struct ieee80211_sta *sta, 142 struct rs_rate *rate, 143 const struct rs_tx_column *next_col); 144 145 struct rs_tx_column { 146 enum rs_column_mode mode; 147 u8 ant; 148 bool sgi; 149 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 150 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 151 }; 152 153 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 154 struct rs_rate *rate, 155 const struct rs_tx_column *next_col) 156 { 157 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 158 } 159 160 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 161 struct rs_rate *rate, 162 const struct rs_tx_column *next_col) 163 { 164 if (!sta->ht_cap.ht_supported) 165 return false; 166 167 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 168 return false; 169 170 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 171 return false; 172 173 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 174 return false; 175 176 if (mvm->nvm_data->sku_cap_mimo_disabled) 177 return false; 178 179 return true; 180 } 181 182 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 183 struct rs_rate *rate, 184 const struct rs_tx_column *next_col) 185 { 186 if (!sta->ht_cap.ht_supported) 187 return false; 188 189 return true; 190 } 191 192 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 193 struct rs_rate *rate, 194 const struct rs_tx_column *next_col) 195 { 196 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 197 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 198 199 if (is_ht20(rate) && (ht_cap->cap & 200 IEEE80211_HT_CAP_SGI_20)) 201 return true; 202 if (is_ht40(rate) && (ht_cap->cap & 203 IEEE80211_HT_CAP_SGI_40)) 204 return true; 205 if (is_ht80(rate) && (vht_cap->cap & 206 IEEE80211_VHT_CAP_SHORT_GI_80)) 207 return true; 208 if (is_ht160(rate) && (vht_cap->cap & 209 IEEE80211_VHT_CAP_SHORT_GI_160)) 210 return true; 211 212 return false; 213 } 214 215 static const struct rs_tx_column rs_tx_columns[] = { 216 [RS_COLUMN_LEGACY_ANT_A] = { 217 .mode = RS_LEGACY, 218 .ant = ANT_A, 219 .next_columns = { 220 RS_COLUMN_LEGACY_ANT_B, 221 RS_COLUMN_SISO_ANT_A, 222 RS_COLUMN_MIMO2, 223 RS_COLUMN_INVALID, 224 RS_COLUMN_INVALID, 225 RS_COLUMN_INVALID, 226 RS_COLUMN_INVALID, 227 }, 228 .checks = { 229 rs_ant_allow, 230 }, 231 }, 232 [RS_COLUMN_LEGACY_ANT_B] = { 233 .mode = RS_LEGACY, 234 .ant = ANT_B, 235 .next_columns = { 236 RS_COLUMN_LEGACY_ANT_A, 237 RS_COLUMN_SISO_ANT_B, 238 RS_COLUMN_MIMO2, 239 RS_COLUMN_INVALID, 240 RS_COLUMN_INVALID, 241 RS_COLUMN_INVALID, 242 RS_COLUMN_INVALID, 243 }, 244 .checks = { 245 rs_ant_allow, 246 }, 247 }, 248 [RS_COLUMN_SISO_ANT_A] = { 249 .mode = RS_SISO, 250 .ant = ANT_A, 251 .next_columns = { 252 RS_COLUMN_SISO_ANT_B, 253 RS_COLUMN_MIMO2, 254 RS_COLUMN_SISO_ANT_A_SGI, 255 RS_COLUMN_LEGACY_ANT_A, 256 RS_COLUMN_LEGACY_ANT_B, 257 RS_COLUMN_INVALID, 258 RS_COLUMN_INVALID, 259 }, 260 .checks = { 261 rs_siso_allow, 262 rs_ant_allow, 263 }, 264 }, 265 [RS_COLUMN_SISO_ANT_B] = { 266 .mode = RS_SISO, 267 .ant = ANT_B, 268 .next_columns = { 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_MIMO2, 271 RS_COLUMN_SISO_ANT_B_SGI, 272 RS_COLUMN_LEGACY_ANT_A, 273 RS_COLUMN_LEGACY_ANT_B, 274 RS_COLUMN_INVALID, 275 RS_COLUMN_INVALID, 276 }, 277 .checks = { 278 rs_siso_allow, 279 rs_ant_allow, 280 }, 281 }, 282 [RS_COLUMN_SISO_ANT_A_SGI] = { 283 .mode = RS_SISO, 284 .ant = ANT_A, 285 .sgi = true, 286 .next_columns = { 287 RS_COLUMN_SISO_ANT_B_SGI, 288 RS_COLUMN_MIMO2_SGI, 289 RS_COLUMN_SISO_ANT_A, 290 RS_COLUMN_LEGACY_ANT_A, 291 RS_COLUMN_LEGACY_ANT_B, 292 RS_COLUMN_INVALID, 293 RS_COLUMN_INVALID, 294 }, 295 .checks = { 296 rs_siso_allow, 297 rs_ant_allow, 298 rs_sgi_allow, 299 }, 300 }, 301 [RS_COLUMN_SISO_ANT_B_SGI] = { 302 .mode = RS_SISO, 303 .ant = ANT_B, 304 .sgi = true, 305 .next_columns = { 306 RS_COLUMN_SISO_ANT_A_SGI, 307 RS_COLUMN_MIMO2_SGI, 308 RS_COLUMN_SISO_ANT_B, 309 RS_COLUMN_LEGACY_ANT_A, 310 RS_COLUMN_LEGACY_ANT_B, 311 RS_COLUMN_INVALID, 312 RS_COLUMN_INVALID, 313 }, 314 .checks = { 315 rs_siso_allow, 316 rs_ant_allow, 317 rs_sgi_allow, 318 }, 319 }, 320 [RS_COLUMN_MIMO2] = { 321 .mode = RS_MIMO2, 322 .ant = ANT_AB, 323 .next_columns = { 324 RS_COLUMN_SISO_ANT_A, 325 RS_COLUMN_MIMO2_SGI, 326 RS_COLUMN_LEGACY_ANT_A, 327 RS_COLUMN_LEGACY_ANT_B, 328 RS_COLUMN_INVALID, 329 RS_COLUMN_INVALID, 330 RS_COLUMN_INVALID, 331 }, 332 .checks = { 333 rs_mimo_allow, 334 }, 335 }, 336 [RS_COLUMN_MIMO2_SGI] = { 337 .mode = RS_MIMO2, 338 .ant = ANT_AB, 339 .sgi = true, 340 .next_columns = { 341 RS_COLUMN_SISO_ANT_A_SGI, 342 RS_COLUMN_MIMO2, 343 RS_COLUMN_LEGACY_ANT_A, 344 RS_COLUMN_LEGACY_ANT_B, 345 RS_COLUMN_INVALID, 346 RS_COLUMN_INVALID, 347 RS_COLUMN_INVALID, 348 }, 349 .checks = { 350 rs_mimo_allow, 351 rs_sgi_allow, 352 }, 353 }, 354 }; 355 356 static inline u8 rs_extract_rate(u32 rate_n_flags) 357 { 358 /* also works for HT because bits 7:6 are zero there */ 359 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 360 } 361 362 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 363 { 364 int idx = 0; 365 366 if (rate_n_flags & RATE_MCS_HT_MSK) { 367 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 368 idx += IWL_RATE_MCS_0_INDEX; 369 370 /* skip 9M not supported in HT*/ 371 if (idx >= IWL_RATE_9M_INDEX) 372 idx += 1; 373 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 374 return idx; 375 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 376 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 377 idx += IWL_RATE_MCS_0_INDEX; 378 379 /* skip 9M not supported in VHT*/ 380 if (idx >= IWL_RATE_9M_INDEX) 381 idx++; 382 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 383 return idx; 384 } else { 385 /* legacy rate format, search for match in table */ 386 387 u8 legacy_rate = rs_extract_rate(rate_n_flags); 388 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 389 if (iwl_rates[idx].plcp == legacy_rate) 390 return idx; 391 } 392 393 return IWL_RATE_INVALID; 394 } 395 396 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 397 struct ieee80211_sta *sta, 398 struct iwl_lq_sta *lq_sta, 399 int tid, bool ndp); 400 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 401 struct ieee80211_sta *sta, 402 struct iwl_lq_sta *lq_sta, 403 const struct rs_rate *initial_rate); 404 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 405 406 /** 407 * The following tables contain the expected throughput metrics for all rates 408 * 409 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 410 * 411 * where invalid entries are zeros. 412 * 413 * CCK rates are only valid in legacy table and will only be used in G 414 * (2.4 GHz) band. 415 */ 416 417 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 418 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 419 }; 420 421 /* Expected TpT tables. 4 indexes: 422 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 423 */ 424 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 425 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 426 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 427 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 428 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 429 }; 430 431 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 432 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 433 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 434 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 435 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 436 }; 437 438 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 439 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 440 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 441 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 442 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 443 }; 444 445 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 446 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 447 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 448 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 449 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 450 }; 451 452 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 453 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 454 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 455 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 456 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 457 }; 458 459 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 460 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 461 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 462 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 463 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 464 }; 465 466 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 467 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 468 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 469 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 470 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 471 }; 472 473 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 474 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 475 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 476 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 477 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 478 }; 479 480 /* mbps, mcs */ 481 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 482 { "1", "BPSK DSSS"}, 483 { "2", "QPSK DSSS"}, 484 {"5.5", "BPSK CCK"}, 485 { "11", "QPSK CCK"}, 486 { "6", "BPSK 1/2"}, 487 { "9", "BPSK 1/2"}, 488 { "12", "QPSK 1/2"}, 489 { "18", "QPSK 3/4"}, 490 { "24", "16QAM 1/2"}, 491 { "36", "16QAM 3/4"}, 492 { "48", "64QAM 2/3"}, 493 { "54", "64QAM 3/4"}, 494 { "60", "64QAM 5/6"}, 495 }; 496 497 #define MCS_INDEX_PER_STREAM (8) 498 499 static const char *rs_pretty_ant(u8 ant) 500 { 501 static const char * const ant_name[] = { 502 [ANT_NONE] = "None", 503 [ANT_A] = "A", 504 [ANT_B] = "B", 505 [ANT_AB] = "AB", 506 [ANT_C] = "C", 507 [ANT_AC] = "AC", 508 [ANT_BC] = "BC", 509 [ANT_ABC] = "ABC", 510 }; 511 512 if (ant > ANT_ABC) 513 return "UNKNOWN"; 514 515 return ant_name[ant]; 516 } 517 518 static const char *rs_pretty_lq_type(enum iwl_table_type type) 519 { 520 static const char * const lq_types[] = { 521 [LQ_NONE] = "NONE", 522 [LQ_LEGACY_A] = "LEGACY_A", 523 [LQ_LEGACY_G] = "LEGACY_G", 524 [LQ_HT_SISO] = "HT SISO", 525 [LQ_HT_MIMO2] = "HT MIMO", 526 [LQ_VHT_SISO] = "VHT SISO", 527 [LQ_VHT_MIMO2] = "VHT MIMO", 528 }; 529 530 if (type < LQ_NONE || type >= LQ_MAX) 531 return "UNKNOWN"; 532 533 return lq_types[type]; 534 } 535 536 static char *rs_pretty_rate(const struct rs_rate *rate) 537 { 538 static char buf[40]; 539 static const char * const legacy_rates[] = { 540 [IWL_RATE_1M_INDEX] = "1M", 541 [IWL_RATE_2M_INDEX] = "2M", 542 [IWL_RATE_5M_INDEX] = "5.5M", 543 [IWL_RATE_11M_INDEX] = "11M", 544 [IWL_RATE_6M_INDEX] = "6M", 545 [IWL_RATE_9M_INDEX] = "9M", 546 [IWL_RATE_12M_INDEX] = "12M", 547 [IWL_RATE_18M_INDEX] = "18M", 548 [IWL_RATE_24M_INDEX] = "24M", 549 [IWL_RATE_36M_INDEX] = "36M", 550 [IWL_RATE_48M_INDEX] = "48M", 551 [IWL_RATE_54M_INDEX] = "54M", 552 }; 553 static const char *const ht_vht_rates[] = { 554 [IWL_RATE_MCS_0_INDEX] = "MCS0", 555 [IWL_RATE_MCS_1_INDEX] = "MCS1", 556 [IWL_RATE_MCS_2_INDEX] = "MCS2", 557 [IWL_RATE_MCS_3_INDEX] = "MCS3", 558 [IWL_RATE_MCS_4_INDEX] = "MCS4", 559 [IWL_RATE_MCS_5_INDEX] = "MCS5", 560 [IWL_RATE_MCS_6_INDEX] = "MCS6", 561 [IWL_RATE_MCS_7_INDEX] = "MCS7", 562 [IWL_RATE_MCS_8_INDEX] = "MCS8", 563 [IWL_RATE_MCS_9_INDEX] = "MCS9", 564 }; 565 const char *rate_str; 566 567 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 568 rate_str = legacy_rates[rate->index]; 569 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 570 (rate->index >= IWL_RATE_MCS_0_INDEX) && 571 (rate->index <= IWL_RATE_MCS_9_INDEX)) 572 rate_str = ht_vht_rates[rate->index]; 573 else 574 rate_str = "BAD_RATE"; 575 576 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 577 rs_pretty_ant(rate->ant), rate_str); 578 return buf; 579 } 580 581 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 582 const char *prefix) 583 { 584 IWL_DEBUG_RATE(mvm, 585 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 586 prefix, rs_pretty_rate(rate), rate->bw, 587 rate->sgi, rate->ldpc, rate->stbc); 588 } 589 590 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 591 { 592 window->data = 0; 593 window->success_counter = 0; 594 window->success_ratio = IWL_INVALID_VALUE; 595 window->counter = 0; 596 window->average_tpt = IWL_INVALID_VALUE; 597 } 598 599 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 600 struct iwl_scale_tbl_info *tbl) 601 { 602 int i; 603 604 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 605 for (i = 0; i < IWL_RATE_COUNT; i++) 606 rs_rate_scale_clear_window(&tbl->win[i]); 607 608 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 609 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 610 } 611 612 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 613 { 614 return (ant_type & valid_antenna) == ant_type; 615 } 616 617 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 618 struct iwl_lq_sta *lq_data, u8 tid, 619 struct ieee80211_sta *sta) 620 { 621 int ret = -EAGAIN; 622 623 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 624 sta->addr, tid); 625 ret = ieee80211_start_tx_ba_session(sta, tid, 5000); 626 if (ret == -EAGAIN) { 627 /* 628 * driver and mac80211 is out of sync 629 * this might be cause by reloading firmware 630 * stop the tx ba session here 631 */ 632 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 633 tid); 634 ieee80211_stop_tx_ba_session(sta, tid); 635 } 636 return ret; 637 } 638 639 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid, 640 struct iwl_lq_sta *lq_data, 641 struct ieee80211_sta *sta) 642 { 643 if (tid < IWL_MAX_TID_COUNT) 644 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta); 645 else 646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 647 tid, IWL_MAX_TID_COUNT); 648 } 649 650 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 651 { 652 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 653 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 654 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 655 } 656 657 /* 658 * Static function to get the expected throughput from an iwl_scale_tbl_info 659 * that wraps a NULL pointer check 660 */ 661 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 662 { 663 if (tbl->expected_tpt) 664 return tbl->expected_tpt[rs_index]; 665 return 0; 666 } 667 668 /** 669 * rs_collect_tx_data - Update the success/failure sliding window 670 * 671 * We keep a sliding window of the last 62 packets transmitted 672 * at this rate. window->data contains the bitmask of successful 673 * packets. 674 */ 675 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 676 struct iwl_scale_tbl_info *tbl, 677 int scale_index, int attempts, int successes, 678 struct iwl_rate_scale_data *window) 679 { 680 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 681 s32 fail_count, tpt; 682 683 /* Get expected throughput */ 684 tpt = get_expected_tpt(tbl, scale_index); 685 686 /* 687 * Keep track of only the latest 62 tx frame attempts in this rate's 688 * history window; anything older isn't really relevant any more. 689 * If we have filled up the sliding window, drop the oldest attempt; 690 * if the oldest attempt (highest bit in bitmap) shows "success", 691 * subtract "1" from the success counter (this is the main reason 692 * we keep these bitmaps!). 693 */ 694 while (attempts > 0) { 695 if (window->counter >= IWL_RATE_MAX_WINDOW) { 696 /* remove earliest */ 697 window->counter = IWL_RATE_MAX_WINDOW - 1; 698 699 if (window->data & mask) { 700 window->data &= ~mask; 701 window->success_counter--; 702 } 703 } 704 705 /* Increment frames-attempted counter */ 706 window->counter++; 707 708 /* Shift bitmap by one frame to throw away oldest history */ 709 window->data <<= 1; 710 711 /* Mark the most recent #successes attempts as successful */ 712 if (successes > 0) { 713 window->success_counter++; 714 window->data |= 0x1; 715 successes--; 716 } 717 718 attempts--; 719 } 720 721 /* Calculate current success ratio, avoid divide-by-0! */ 722 if (window->counter > 0) 723 window->success_ratio = 128 * (100 * window->success_counter) 724 / window->counter; 725 else 726 window->success_ratio = IWL_INVALID_VALUE; 727 728 fail_count = window->counter - window->success_counter; 729 730 /* Calculate average throughput, if we have enough history. */ 731 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 732 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 733 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 734 else 735 window->average_tpt = IWL_INVALID_VALUE; 736 737 return 0; 738 } 739 740 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 741 struct iwl_lq_sta *lq_sta, 742 struct iwl_scale_tbl_info *tbl, 743 int scale_index, int attempts, int successes, 744 u8 reduced_txp) 745 { 746 struct iwl_rate_scale_data *window = NULL; 747 748 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 749 return -EINVAL; 750 751 window = &tbl->tpc_win[reduced_txp]; 752 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 753 window); 754 } 755 756 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 757 struct iwl_lq_sta *lq_sta, 758 struct iwl_scale_tbl_info *tbl, 759 int scale_index, int attempts, int successes) 760 { 761 struct iwl_rate_scale_data *window = NULL; 762 763 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 764 return -EINVAL; 765 766 if (tbl->column != RS_COLUMN_INVALID) { 767 struct lq_sta_pers *pers = &lq_sta->pers; 768 769 pers->tx_stats[tbl->column][scale_index].total += attempts; 770 pers->tx_stats[tbl->column][scale_index].success += successes; 771 } 772 773 /* Select window for current tx bit rate */ 774 window = &(tbl->win[scale_index]); 775 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 776 window); 777 } 778 779 /* Convert rs_rate object into ucode rate bitmask */ 780 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 781 struct rs_rate *rate) 782 { 783 u32 ucode_rate = 0; 784 int index = rate->index; 785 786 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 787 RATE_MCS_ANT_ABC_MSK); 788 789 if (is_legacy(rate)) { 790 ucode_rate |= iwl_rates[index].plcp; 791 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 792 ucode_rate |= RATE_MCS_CCK_MSK; 793 return ucode_rate; 794 } 795 796 if (is_ht(rate)) { 797 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 798 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 799 index = IWL_LAST_HT_RATE; 800 } 801 ucode_rate |= RATE_MCS_HT_MSK; 802 803 if (is_ht_siso(rate)) 804 ucode_rate |= iwl_rates[index].plcp_ht_siso; 805 else if (is_ht_mimo2(rate)) 806 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 807 else 808 WARN_ON_ONCE(1); 809 } else if (is_vht(rate)) { 810 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 811 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 812 index = IWL_LAST_VHT_RATE; 813 } 814 ucode_rate |= RATE_MCS_VHT_MSK; 815 if (is_vht_siso(rate)) 816 ucode_rate |= iwl_rates[index].plcp_vht_siso; 817 else if (is_vht_mimo2(rate)) 818 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 819 else 820 WARN_ON_ONCE(1); 821 822 } else { 823 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 824 } 825 826 if (is_siso(rate) && rate->stbc) { 827 /* To enable STBC we need to set both a flag and ANT_AB */ 828 ucode_rate |= RATE_MCS_ANT_AB_MSK; 829 ucode_rate |= RATE_MCS_STBC_MSK; 830 } 831 832 ucode_rate |= rate->bw; 833 if (rate->sgi) 834 ucode_rate |= RATE_MCS_SGI_MSK; 835 if (rate->ldpc) 836 ucode_rate |= RATE_MCS_LDPC_MSK; 837 838 return ucode_rate; 839 } 840 841 /* Convert a ucode rate into an rs_rate object */ 842 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 843 enum nl80211_band band, 844 struct rs_rate *rate) 845 { 846 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 847 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 848 u8 nss; 849 850 memset(rate, 0, sizeof(*rate)); 851 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 852 853 if (rate->index == IWL_RATE_INVALID) 854 return -EINVAL; 855 856 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 857 858 /* Legacy */ 859 if (!(ucode_rate & RATE_MCS_HT_MSK) && 860 !(ucode_rate & RATE_MCS_VHT_MSK)) { 861 if (num_of_ant == 1) { 862 if (band == NL80211_BAND_5GHZ) 863 rate->type = LQ_LEGACY_A; 864 else 865 rate->type = LQ_LEGACY_G; 866 } 867 868 return 0; 869 } 870 871 /* HT or VHT */ 872 if (ucode_rate & RATE_MCS_SGI_MSK) 873 rate->sgi = true; 874 if (ucode_rate & RATE_MCS_LDPC_MSK) 875 rate->ldpc = true; 876 if (ucode_rate & RATE_MCS_STBC_MSK) 877 rate->stbc = true; 878 if (ucode_rate & RATE_MCS_BF_MSK) 879 rate->bfer = true; 880 881 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 882 883 if (ucode_rate & RATE_MCS_HT_MSK) { 884 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 885 RATE_HT_MCS_NSS_POS) + 1; 886 887 if (nss == 1) { 888 rate->type = LQ_HT_SISO; 889 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 890 "stbc %d bfer %d", 891 rate->stbc, rate->bfer); 892 } else if (nss == 2) { 893 rate->type = LQ_HT_MIMO2; 894 WARN_ON_ONCE(num_of_ant != 2); 895 } else { 896 WARN_ON_ONCE(1); 897 } 898 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 899 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 900 RATE_VHT_MCS_NSS_POS) + 1; 901 902 if (nss == 1) { 903 rate->type = LQ_VHT_SISO; 904 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 905 "stbc %d bfer %d", 906 rate->stbc, rate->bfer); 907 } else if (nss == 2) { 908 rate->type = LQ_VHT_MIMO2; 909 WARN_ON_ONCE(num_of_ant != 2); 910 } else { 911 WARN_ON_ONCE(1); 912 } 913 } 914 915 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 916 !is_vht(rate)); 917 918 return 0; 919 } 920 921 /* switch to another antenna/antennas and return 1 */ 922 /* if no other valid antenna found, return 0 */ 923 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 924 { 925 u8 new_ant_type; 926 927 if (!rate->ant || rate->ant > ANT_ABC) 928 return 0; 929 930 if (!rs_is_valid_ant(valid_ant, rate->ant)) 931 return 0; 932 933 new_ant_type = ant_toggle_lookup[rate->ant]; 934 935 while ((new_ant_type != rate->ant) && 936 !rs_is_valid_ant(valid_ant, new_ant_type)) 937 new_ant_type = ant_toggle_lookup[new_ant_type]; 938 939 if (new_ant_type == rate->ant) 940 return 0; 941 942 rate->ant = new_ant_type; 943 944 return 1; 945 } 946 947 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 948 struct rs_rate *rate) 949 { 950 if (is_legacy(rate)) 951 return lq_sta->active_legacy_rate; 952 else if (is_siso(rate)) 953 return lq_sta->active_siso_rate; 954 else if (is_mimo2(rate)) 955 return lq_sta->active_mimo2_rate; 956 957 WARN_ON_ONCE(1); 958 return 0; 959 } 960 961 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 962 int rate_type) 963 { 964 u8 high = IWL_RATE_INVALID; 965 u8 low = IWL_RATE_INVALID; 966 967 /* 802.11A or ht walks to the next literal adjacent rate in 968 * the rate table */ 969 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 970 int i; 971 u32 mask; 972 973 /* Find the previous rate that is in the rate mask */ 974 i = index - 1; 975 if (i >= 0) 976 mask = BIT(i); 977 for (; i >= 0; i--, mask >>= 1) { 978 if (rate_mask & mask) { 979 low = i; 980 break; 981 } 982 } 983 984 /* Find the next rate that is in the rate mask */ 985 i = index + 1; 986 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 987 if (rate_mask & mask) { 988 high = i; 989 break; 990 } 991 } 992 993 return (high << 8) | low; 994 } 995 996 low = index; 997 while (low != IWL_RATE_INVALID) { 998 low = iwl_rates[low].prev_rs; 999 if (low == IWL_RATE_INVALID) 1000 break; 1001 if (rate_mask & (1 << low)) 1002 break; 1003 } 1004 1005 high = index; 1006 while (high != IWL_RATE_INVALID) { 1007 high = iwl_rates[high].next_rs; 1008 if (high == IWL_RATE_INVALID) 1009 break; 1010 if (rate_mask & (1 << high)) 1011 break; 1012 } 1013 1014 return (high << 8) | low; 1015 } 1016 1017 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1018 struct rs_rate *rate) 1019 { 1020 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1021 } 1022 1023 /* Get the next supported lower rate in the current column. 1024 * Return true if bottom rate in the current column was reached 1025 */ 1026 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1027 struct rs_rate *rate) 1028 { 1029 u8 low; 1030 u16 high_low; 1031 u16 rate_mask; 1032 struct iwl_mvm *mvm = lq_sta->pers.drv; 1033 1034 rate_mask = rs_get_supported_rates(lq_sta, rate); 1035 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1036 rate->type); 1037 low = high_low & 0xff; 1038 1039 /* Bottom rate of column reached */ 1040 if (low == IWL_RATE_INVALID) 1041 return true; 1042 1043 rate->index = low; 1044 return false; 1045 } 1046 1047 /* Get the next rate to use following a column downgrade */ 1048 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1049 struct rs_rate *rate) 1050 { 1051 struct iwl_mvm *mvm = lq_sta->pers.drv; 1052 1053 if (is_legacy(rate)) { 1054 /* No column to downgrade from Legacy */ 1055 return; 1056 } else if (is_siso(rate)) { 1057 /* Downgrade to Legacy if we were in SISO */ 1058 if (lq_sta->band == NL80211_BAND_5GHZ) 1059 rate->type = LQ_LEGACY_A; 1060 else 1061 rate->type = LQ_LEGACY_G; 1062 1063 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1064 1065 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1066 rate->index > IWL_RATE_MCS_9_INDEX); 1067 1068 rate->index = rs_ht_to_legacy[rate->index]; 1069 rate->ldpc = false; 1070 } else { 1071 /* Downgrade to SISO with same MCS if in MIMO */ 1072 rate->type = is_vht_mimo2(rate) ? 1073 LQ_VHT_SISO : LQ_HT_SISO; 1074 } 1075 1076 if (num_of_ant(rate->ant) > 1) 1077 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1078 1079 /* Relevant in both switching to SISO or Legacy */ 1080 rate->sgi = false; 1081 1082 if (!rs_rate_supported(lq_sta, rate)) 1083 rs_get_lower_rate_in_column(lq_sta, rate); 1084 } 1085 1086 /* Check if both rates are identical 1087 * allow_ant_mismatch enables matching a SISO rate on ANT_A or ANT_B 1088 * with a rate indicating STBC/BFER and ANT_AB. 1089 */ 1090 static inline bool rs_rate_equal(struct rs_rate *a, 1091 struct rs_rate *b, 1092 bool allow_ant_mismatch) 1093 1094 { 1095 bool ant_match = (a->ant == b->ant) && (a->stbc == b->stbc) && 1096 (a->bfer == b->bfer); 1097 1098 if (allow_ant_mismatch) { 1099 if (a->stbc || a->bfer) { 1100 WARN_ONCE(a->ant != ANT_AB, "stbc %d bfer %d ant %d", 1101 a->stbc, a->bfer, a->ant); 1102 ant_match |= (b->ant == ANT_A || b->ant == ANT_B); 1103 } else if (b->stbc || b->bfer) { 1104 WARN_ONCE(b->ant != ANT_AB, "stbc %d bfer %d ant %d", 1105 b->stbc, b->bfer, b->ant); 1106 ant_match |= (a->ant == ANT_A || a->ant == ANT_B); 1107 } 1108 } 1109 1110 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) && 1111 (a->ldpc == b->ldpc) && (a->index == b->index) && ant_match; 1112 } 1113 1114 /* Check if both rates share the same column */ 1115 static inline bool rs_rate_column_match(struct rs_rate *a, 1116 struct rs_rate *b) 1117 { 1118 bool ant_match; 1119 1120 if (a->stbc || a->bfer) 1121 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1122 else 1123 ant_match = (a->ant == b->ant); 1124 1125 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1126 && ant_match; 1127 } 1128 1129 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1130 { 1131 if (is_legacy(rate)) { 1132 if (rate->ant == ANT_A) 1133 return RS_COLUMN_LEGACY_ANT_A; 1134 1135 if (rate->ant == ANT_B) 1136 return RS_COLUMN_LEGACY_ANT_B; 1137 1138 goto err; 1139 } 1140 1141 if (is_siso(rate)) { 1142 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1143 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1144 RS_COLUMN_SISO_ANT_A; 1145 1146 if (rate->ant == ANT_B) 1147 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1148 RS_COLUMN_SISO_ANT_B; 1149 1150 goto err; 1151 } 1152 1153 if (is_mimo(rate)) 1154 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1155 1156 err: 1157 return RS_COLUMN_INVALID; 1158 } 1159 1160 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1161 { 1162 u8 tid = IWL_MAX_TID_COUNT; 1163 1164 if (ieee80211_is_data_qos(hdr->frame_control)) { 1165 u8 *qc = ieee80211_get_qos_ctl(hdr); 1166 tid = qc[0] & 0xf; 1167 } 1168 1169 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1170 tid = IWL_MAX_TID_COUNT; 1171 1172 return tid; 1173 } 1174 1175 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1176 int tid, struct ieee80211_tx_info *info, bool ndp) 1177 { 1178 int legacy_success; 1179 int retries; 1180 int i; 1181 struct iwl_lq_cmd *table; 1182 u32 lq_hwrate; 1183 struct rs_rate lq_rate, tx_resp_rate; 1184 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1185 u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0]; 1186 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1187 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1188 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta; 1189 bool allow_ant_mismatch = fw_has_api(&mvm->fw->ucode_capa, 1190 IWL_UCODE_TLV_API_LQ_SS_PARAMS); 1191 1192 /* Treat uninitialized rate scaling data same as non-existing. */ 1193 if (!lq_sta) { 1194 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1195 return; 1196 } else if (!lq_sta->pers.drv) { 1197 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1198 return; 1199 } 1200 1201 /* This packet was aggregated but doesn't carry status info */ 1202 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1203 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1204 return; 1205 1206 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1207 1208 #ifdef CONFIG_MAC80211_DEBUGFS 1209 /* Disable last tx check if we are debugging with fixed rate but 1210 * update tx stats */ 1211 if (lq_sta->pers.dbg_fixed_rate) { 1212 int index = tx_resp_rate.index; 1213 enum rs_column column; 1214 int attempts, success; 1215 1216 column = rs_get_column_from_rate(&tx_resp_rate); 1217 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1218 "Can't map rate 0x%x to column", 1219 tx_resp_hwrate)) 1220 return; 1221 1222 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1223 attempts = info->status.ampdu_len; 1224 success = info->status.ampdu_ack_len; 1225 } else { 1226 attempts = info->status.rates[0].count; 1227 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1228 } 1229 1230 lq_sta->pers.tx_stats[column][index].total += attempts; 1231 lq_sta->pers.tx_stats[column][index].success += success; 1232 1233 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1234 tx_resp_hwrate, success, attempts); 1235 return; 1236 } 1237 #endif 1238 1239 if (time_after(jiffies, 1240 (unsigned long)(lq_sta->last_tx + 1241 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1242 int t; 1243 1244 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1245 for (t = 0; t < IWL_MAX_TID_COUNT; t++) 1246 ieee80211_stop_tx_ba_session(sta, t); 1247 1248 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1249 return; 1250 } 1251 lq_sta->last_tx = jiffies; 1252 1253 /* Ignore this Tx frame response if its initial rate doesn't match 1254 * that of latest Link Quality command. There may be stragglers 1255 * from a previous Link Quality command, but we're no longer interested 1256 * in those; they're either from the "active" mode while we're trying 1257 * to check "search" mode, or a prior "search" mode after we've moved 1258 * to a new "search" mode (which might become the new "active" mode). 1259 */ 1260 table = &lq_sta->lq; 1261 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1262 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1263 1264 /* Here we actually compare this rate to the latest LQ command */ 1265 if (!rs_rate_equal(&tx_resp_rate, &lq_rate, allow_ant_mismatch)) { 1266 IWL_DEBUG_RATE(mvm, 1267 "initial tx resp rate 0x%x does not match 0x%x\n", 1268 tx_resp_hwrate, lq_hwrate); 1269 1270 /* 1271 * Since rates mis-match, the last LQ command may have failed. 1272 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1273 * ... driver. 1274 */ 1275 lq_sta->missed_rate_counter++; 1276 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1277 lq_sta->missed_rate_counter = 0; 1278 IWL_DEBUG_RATE(mvm, 1279 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1280 lq_sta->rs_state); 1281 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1282 } 1283 /* Regardless, ignore this status info for outdated rate */ 1284 return; 1285 } else 1286 /* Rate did match, so reset the missed_rate_counter */ 1287 lq_sta->missed_rate_counter = 0; 1288 1289 if (!lq_sta->search_better_tbl) { 1290 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1291 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1292 } else { 1293 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1294 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1295 } 1296 1297 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1298 IWL_DEBUG_RATE(mvm, 1299 "Neither active nor search matches tx rate\n"); 1300 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1301 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1302 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1303 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1304 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1305 1306 /* 1307 * no matching table found, let's by-pass the data collection 1308 * and continue to perform rate scale to find the rate table 1309 */ 1310 rs_stay_in_table(lq_sta, true); 1311 goto done; 1312 } 1313 1314 /* 1315 * Updating the frame history depends on whether packets were 1316 * aggregated. 1317 * 1318 * For aggregation, all packets were transmitted at the same rate, the 1319 * first index into rate scale table. 1320 */ 1321 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1322 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1323 info->status.ampdu_len, 1324 info->status.ampdu_ack_len, 1325 reduced_txp); 1326 1327 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1328 * it as a single frame loss as we don't want the success ratio 1329 * to dip too quickly because a BA wasn't received. 1330 * For TPC, there's no need for this optimisation since we want 1331 * to recover very quickly from a bad power reduction and, 1332 * therefore we'd like the success ratio to get an immediate hit 1333 * when failing to get a BA, so we'd switch back to a lower or 1334 * zero power reduction. When FW transmits agg with a rate 1335 * different from the initial rate, it will not use reduced txp 1336 * and will send BA notification twice (one empty with reduced 1337 * txp equal to the value from LQ and one with reduced txp 0). 1338 * We need to update counters for each txp level accordingly. 1339 */ 1340 if (info->status.ampdu_ack_len == 0) 1341 info->status.ampdu_len = 1; 1342 1343 rs_collect_tlc_data(mvm, lq_sta, curr_tbl, lq_rate.index, 1344 info->status.ampdu_len, 1345 info->status.ampdu_ack_len); 1346 1347 /* Update success/fail counts if not searching for new mode */ 1348 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1349 lq_sta->total_success += info->status.ampdu_ack_len; 1350 lq_sta->total_failed += (info->status.ampdu_len - 1351 info->status.ampdu_ack_len); 1352 } 1353 } else { 1354 /* For legacy, update frame history with for each Tx retry. */ 1355 retries = info->status.rates[0].count - 1; 1356 /* HW doesn't send more than 15 retries */ 1357 retries = min(retries, 15); 1358 1359 /* The last transmission may have been successful */ 1360 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1361 /* Collect data for each rate used during failed TX attempts */ 1362 for (i = 0; i <= retries; ++i) { 1363 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1364 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1365 &lq_rate); 1366 /* 1367 * Only collect stats if retried rate is in the same RS 1368 * table as active/search. 1369 */ 1370 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1371 tmp_tbl = curr_tbl; 1372 else if (rs_rate_column_match(&lq_rate, 1373 &other_tbl->rate)) 1374 tmp_tbl = other_tbl; 1375 else 1376 continue; 1377 1378 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1379 lq_rate.index, 1, 1380 i < retries ? 0 : legacy_success, 1381 reduced_txp); 1382 rs_collect_tlc_data(mvm, lq_sta, tmp_tbl, 1383 lq_rate.index, 1, 1384 i < retries ? 0 : legacy_success); 1385 } 1386 1387 /* Update success/fail counts if not searching for new mode */ 1388 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1389 lq_sta->total_success += legacy_success; 1390 lq_sta->total_failed += retries + (1 - legacy_success); 1391 } 1392 } 1393 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1394 lq_sta->last_rate_n_flags = lq_hwrate; 1395 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1396 done: 1397 /* See if there's a better rate or modulation mode to try. */ 1398 if (sta->supp_rates[info->band]) 1399 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1400 } 1401 1402 /* 1403 * mac80211 sends us Tx status 1404 */ 1405 static void rs_mac80211_tx_status(void *mvm_r, 1406 struct ieee80211_supported_band *sband, 1407 struct ieee80211_sta *sta, void *priv_sta, 1408 struct sk_buff *skb) 1409 { 1410 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1411 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r; 1412 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1414 1415 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1416 return; 1417 1418 if (!ieee80211_is_data(hdr->frame_control) || 1419 info->flags & IEEE80211_TX_CTL_NO_ACK) 1420 return; 1421 1422 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1423 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1424 } 1425 1426 /* 1427 * Begin a period of staying with a selected modulation mode. 1428 * Set "stay_in_tbl" flag to prevent any mode switches. 1429 * Set frame tx success limits according to legacy vs. high-throughput, 1430 * and reset overall (spanning all rates) tx success history statistics. 1431 * These control how long we stay using same modulation mode before 1432 * searching for a new mode. 1433 */ 1434 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1435 struct iwl_lq_sta *lq_sta) 1436 { 1437 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1438 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1439 if (is_legacy) { 1440 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1441 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1442 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1443 } else { 1444 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1445 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1446 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1447 } 1448 lq_sta->table_count = 0; 1449 lq_sta->total_failed = 0; 1450 lq_sta->total_success = 0; 1451 lq_sta->flush_timer = jiffies; 1452 lq_sta->visited_columns = 0; 1453 } 1454 1455 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1456 { 1457 if (rate_mask) 1458 return find_last_bit(&rate_mask, BITS_PER_LONG); 1459 return IWL_RATE_INVALID; 1460 } 1461 1462 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1463 const struct rs_tx_column *column) 1464 { 1465 switch (column->mode) { 1466 case RS_LEGACY: 1467 return lq_sta->max_legacy_rate_idx; 1468 case RS_SISO: 1469 return lq_sta->max_siso_rate_idx; 1470 case RS_MIMO2: 1471 return lq_sta->max_mimo2_rate_idx; 1472 default: 1473 WARN_ON_ONCE(1); 1474 } 1475 1476 return lq_sta->max_legacy_rate_idx; 1477 } 1478 1479 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1480 const struct rs_tx_column *column, 1481 u32 bw) 1482 { 1483 /* Used to choose among HT tables */ 1484 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1485 1486 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1487 column->mode != RS_SISO && 1488 column->mode != RS_MIMO2)) 1489 return expected_tpt_legacy; 1490 1491 /* Legacy rates have only one table */ 1492 if (column->mode == RS_LEGACY) 1493 return expected_tpt_legacy; 1494 1495 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1496 /* Choose among many HT tables depending on number of streams 1497 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1498 * status */ 1499 if (column->mode == RS_SISO) { 1500 switch (bw) { 1501 case RATE_MCS_CHAN_WIDTH_20: 1502 ht_tbl_pointer = expected_tpt_siso_20MHz; 1503 break; 1504 case RATE_MCS_CHAN_WIDTH_40: 1505 ht_tbl_pointer = expected_tpt_siso_40MHz; 1506 break; 1507 case RATE_MCS_CHAN_WIDTH_80: 1508 ht_tbl_pointer = expected_tpt_siso_80MHz; 1509 break; 1510 case RATE_MCS_CHAN_WIDTH_160: 1511 ht_tbl_pointer = expected_tpt_siso_160MHz; 1512 break; 1513 default: 1514 WARN_ON_ONCE(1); 1515 } 1516 } else if (column->mode == RS_MIMO2) { 1517 switch (bw) { 1518 case RATE_MCS_CHAN_WIDTH_20: 1519 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1520 break; 1521 case RATE_MCS_CHAN_WIDTH_40: 1522 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1523 break; 1524 case RATE_MCS_CHAN_WIDTH_80: 1525 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1526 break; 1527 case RATE_MCS_CHAN_WIDTH_160: 1528 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1529 break; 1530 default: 1531 WARN_ON_ONCE(1); 1532 } 1533 } else { 1534 WARN_ON_ONCE(1); 1535 } 1536 1537 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1538 return ht_tbl_pointer[0]; 1539 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1540 return ht_tbl_pointer[1]; 1541 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1542 return ht_tbl_pointer[2]; 1543 else /* AGG+SGI */ 1544 return ht_tbl_pointer[3]; 1545 } 1546 1547 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1548 struct iwl_scale_tbl_info *tbl) 1549 { 1550 struct rs_rate *rate = &tbl->rate; 1551 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1552 1553 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1554 } 1555 1556 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1557 struct iwl_lq_sta *lq_sta, 1558 struct iwl_scale_tbl_info *tbl, /* "search" */ 1559 unsigned long rate_mask, s8 index) 1560 { 1561 struct iwl_scale_tbl_info *active_tbl = 1562 &(lq_sta->lq_info[lq_sta->active_tbl]); 1563 s32 success_ratio = active_tbl->win[index].success_ratio; 1564 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1565 const u16 *tpt_tbl = tbl->expected_tpt; 1566 u16 high_low; 1567 u32 target_tpt; 1568 int rate_idx; 1569 1570 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1571 target_tpt = 100 * expected_current_tpt; 1572 IWL_DEBUG_RATE(mvm, 1573 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1574 success_ratio, target_tpt); 1575 } else { 1576 target_tpt = lq_sta->last_tpt; 1577 IWL_DEBUG_RATE(mvm, 1578 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1579 success_ratio, target_tpt); 1580 } 1581 1582 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1583 1584 while (rate_idx != IWL_RATE_INVALID) { 1585 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1586 break; 1587 1588 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1589 tbl->rate.type); 1590 1591 rate_idx = (high_low >> 8) & 0xff; 1592 } 1593 1594 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1595 rate_idx, target_tpt, 1596 rate_idx != IWL_RATE_INVALID ? 1597 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1598 1599 return rate_idx; 1600 } 1601 1602 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1603 { 1604 switch (sta->bandwidth) { 1605 case IEEE80211_STA_RX_BW_160: 1606 return RATE_MCS_CHAN_WIDTH_160; 1607 case IEEE80211_STA_RX_BW_80: 1608 return RATE_MCS_CHAN_WIDTH_80; 1609 case IEEE80211_STA_RX_BW_40: 1610 return RATE_MCS_CHAN_WIDTH_40; 1611 case IEEE80211_STA_RX_BW_20: 1612 default: 1613 return RATE_MCS_CHAN_WIDTH_20; 1614 } 1615 } 1616 1617 /* 1618 * Check whether we should continue using same modulation mode, or 1619 * begin search for a new mode, based on: 1620 * 1) # tx successes or failures while using this mode 1621 * 2) # times calling this function 1622 * 3) elapsed time in this mode (not used, for now) 1623 */ 1624 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1625 { 1626 struct iwl_scale_tbl_info *tbl; 1627 int active_tbl; 1628 int flush_interval_passed = 0; 1629 struct iwl_mvm *mvm; 1630 1631 mvm = lq_sta->pers.drv; 1632 active_tbl = lq_sta->active_tbl; 1633 1634 tbl = &(lq_sta->lq_info[active_tbl]); 1635 1636 /* If we've been disallowing search, see if we should now allow it */ 1637 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1638 /* Elapsed time using current modulation mode */ 1639 if (lq_sta->flush_timer) 1640 flush_interval_passed = 1641 time_after(jiffies, 1642 (unsigned long)(lq_sta->flush_timer + 1643 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1644 1645 /* 1646 * Check if we should allow search for new modulation mode. 1647 * If many frames have failed or succeeded, or we've used 1648 * this same modulation for a long time, allow search, and 1649 * reset history stats that keep track of whether we should 1650 * allow a new search. Also (below) reset all bitmaps and 1651 * stats in active history. 1652 */ 1653 if (force_search || 1654 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1655 (lq_sta->total_success > lq_sta->max_success_limit) || 1656 ((!lq_sta->search_better_tbl) && 1657 (lq_sta->flush_timer) && (flush_interval_passed))) { 1658 IWL_DEBUG_RATE(mvm, 1659 "LQ: stay is expired %d %d %d\n", 1660 lq_sta->total_failed, 1661 lq_sta->total_success, 1662 flush_interval_passed); 1663 1664 /* Allow search for new mode */ 1665 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1666 IWL_DEBUG_RATE(mvm, 1667 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1668 lq_sta->total_failed = 0; 1669 lq_sta->total_success = 0; 1670 lq_sta->flush_timer = 0; 1671 /* mark the current column as visited */ 1672 lq_sta->visited_columns = BIT(tbl->column); 1673 /* 1674 * Else if we've used this modulation mode enough repetitions 1675 * (regardless of elapsed time or success/failure), reset 1676 * history bitmaps and rate-specific stats for all rates in 1677 * active table. 1678 */ 1679 } else { 1680 lq_sta->table_count++; 1681 if (lq_sta->table_count >= 1682 lq_sta->table_count_limit) { 1683 lq_sta->table_count = 0; 1684 1685 IWL_DEBUG_RATE(mvm, 1686 "LQ: stay in table clear win\n"); 1687 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1688 } 1689 } 1690 1691 /* If transitioning to allow "search", reset all history 1692 * bitmaps and stats in active table (this will become the new 1693 * "search" table). */ 1694 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1695 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1696 } 1697 } 1698 } 1699 1700 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1701 struct iwl_scale_tbl_info *tbl, 1702 enum rs_action scale_action) 1703 { 1704 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 1705 1706 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1707 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1708 scale_action == RS_ACTION_DOWNSCALE) 1709 sta_priv->tlc_amsdu = false; 1710 else 1711 sta_priv->tlc_amsdu = true; 1712 } 1713 1714 /* 1715 * setup rate table in uCode 1716 */ 1717 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1718 struct ieee80211_sta *sta, 1719 struct iwl_lq_sta *lq_sta, 1720 struct iwl_scale_tbl_info *tbl) 1721 { 1722 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1723 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1724 } 1725 1726 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1727 struct ieee80211_sta *sta, 1728 struct iwl_lq_sta *lq_sta, 1729 struct iwl_scale_tbl_info *tbl, 1730 enum rs_action scale_action) 1731 { 1732 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1733 return false; 1734 1735 if (!is_vht_siso(&tbl->rate)) 1736 return false; 1737 1738 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1739 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1740 (scale_action == RS_ACTION_DOWNSCALE)) { 1741 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1742 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1743 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1744 goto tweaked; 1745 } 1746 1747 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1748 * sustainable, i.e. we're past the test window. We can't go back 1749 * if MCS5 is just tested as this will happen always after switching 1750 * to 20Mhz MCS4 because the rate stats are cleared. 1751 */ 1752 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1753 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1754 (scale_action == RS_ACTION_STAY)) || 1755 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1756 (scale_action == RS_ACTION_UPSCALE)))) { 1757 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1758 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1759 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1760 goto tweaked; 1761 } 1762 1763 return false; 1764 1765 tweaked: 1766 rs_set_expected_tpt_table(lq_sta, tbl); 1767 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1768 return true; 1769 } 1770 1771 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1772 struct iwl_lq_sta *lq_sta, 1773 struct ieee80211_sta *sta, 1774 struct iwl_scale_tbl_info *tbl) 1775 { 1776 int i, j, max_rate; 1777 enum rs_column next_col_id; 1778 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1779 const struct rs_tx_column *next_col; 1780 allow_column_func_t allow_func; 1781 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1782 const u16 *expected_tpt_tbl; 1783 u16 tpt, max_expected_tpt; 1784 1785 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1786 next_col_id = curr_col->next_columns[i]; 1787 1788 if (next_col_id == RS_COLUMN_INVALID) 1789 continue; 1790 1791 if (lq_sta->visited_columns & BIT(next_col_id)) { 1792 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1793 next_col_id); 1794 continue; 1795 } 1796 1797 next_col = &rs_tx_columns[next_col_id]; 1798 1799 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1800 IWL_DEBUG_RATE(mvm, 1801 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1802 next_col_id, valid_ants, next_col->ant); 1803 continue; 1804 } 1805 1806 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1807 allow_func = next_col->checks[j]; 1808 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1809 next_col)) 1810 break; 1811 } 1812 1813 if (j != MAX_COLUMN_CHECKS) { 1814 IWL_DEBUG_RATE(mvm, 1815 "Skip column %d: not allowed (check %d failed)\n", 1816 next_col_id, j); 1817 1818 continue; 1819 } 1820 1821 tpt = lq_sta->last_tpt / 100; 1822 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1823 rs_bw_from_sta_bw(sta)); 1824 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1825 continue; 1826 1827 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1828 if (max_rate == IWL_RATE_INVALID) { 1829 IWL_DEBUG_RATE(mvm, 1830 "Skip column %d: no rate is allowed in this column\n", 1831 next_col_id); 1832 continue; 1833 } 1834 1835 max_expected_tpt = expected_tpt_tbl[max_rate]; 1836 if (tpt >= max_expected_tpt) { 1837 IWL_DEBUG_RATE(mvm, 1838 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1839 next_col_id, max_expected_tpt, tpt); 1840 continue; 1841 } 1842 1843 IWL_DEBUG_RATE(mvm, 1844 "Found potential column %d. Max expected %d current %d\n", 1845 next_col_id, max_expected_tpt, tpt); 1846 break; 1847 } 1848 1849 if (i == MAX_NEXT_COLUMNS) 1850 return RS_COLUMN_INVALID; 1851 1852 return next_col_id; 1853 } 1854 1855 static int rs_switch_to_column(struct iwl_mvm *mvm, 1856 struct iwl_lq_sta *lq_sta, 1857 struct ieee80211_sta *sta, 1858 enum rs_column col_id) 1859 { 1860 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1861 struct iwl_scale_tbl_info *search_tbl = 1862 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1863 struct rs_rate *rate = &search_tbl->rate; 1864 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1865 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1866 u32 sz = (sizeof(struct iwl_scale_tbl_info) - 1867 (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT)); 1868 unsigned long rate_mask = 0; 1869 u32 rate_idx = 0; 1870 1871 memcpy(search_tbl, tbl, sz); 1872 1873 rate->sgi = column->sgi; 1874 rate->ant = column->ant; 1875 1876 if (column->mode == RS_LEGACY) { 1877 if (lq_sta->band == NL80211_BAND_5GHZ) 1878 rate->type = LQ_LEGACY_A; 1879 else 1880 rate->type = LQ_LEGACY_G; 1881 1882 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1883 rate->ldpc = false; 1884 rate_mask = lq_sta->active_legacy_rate; 1885 } else if (column->mode == RS_SISO) { 1886 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1887 rate_mask = lq_sta->active_siso_rate; 1888 } else if (column->mode == RS_MIMO2) { 1889 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1890 rate_mask = lq_sta->active_mimo2_rate; 1891 } else { 1892 WARN_ONCE(1, "Bad column mode"); 1893 } 1894 1895 if (column->mode != RS_LEGACY) { 1896 rate->bw = rs_bw_from_sta_bw(sta); 1897 rate->ldpc = lq_sta->ldpc; 1898 } 1899 1900 search_tbl->column = col_id; 1901 rs_set_expected_tpt_table(lq_sta, search_tbl); 1902 1903 lq_sta->visited_columns |= BIT(col_id); 1904 1905 /* Get the best matching rate if we're changing modes. e.g. 1906 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1907 */ 1908 if (curr_column->mode != column->mode) { 1909 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1910 rate_mask, rate->index); 1911 1912 if ((rate_idx == IWL_RATE_INVALID) || 1913 !(BIT(rate_idx) & rate_mask)) { 1914 IWL_DEBUG_RATE(mvm, 1915 "can not switch with index %d" 1916 " rate mask %lx\n", 1917 rate_idx, rate_mask); 1918 1919 goto err; 1920 } 1921 1922 rate->index = rate_idx; 1923 } 1924 1925 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1926 col_id, rate->index); 1927 1928 return 0; 1929 1930 err: 1931 rate->type = LQ_NONE; 1932 return -1; 1933 } 1934 1935 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1936 struct iwl_scale_tbl_info *tbl, 1937 s32 sr, int low, int high, 1938 int current_tpt, 1939 int low_tpt, int high_tpt) 1940 { 1941 enum rs_action action = RS_ACTION_STAY; 1942 1943 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1944 (current_tpt == 0)) { 1945 IWL_DEBUG_RATE(mvm, 1946 "Decrease rate because of low SR\n"); 1947 return RS_ACTION_DOWNSCALE; 1948 } 1949 1950 if ((low_tpt == IWL_INVALID_VALUE) && 1951 (high_tpt == IWL_INVALID_VALUE) && 1952 (high != IWL_RATE_INVALID)) { 1953 IWL_DEBUG_RATE(mvm, 1954 "No data about high/low rates. Increase rate\n"); 1955 return RS_ACTION_UPSCALE; 1956 } 1957 1958 if ((high_tpt == IWL_INVALID_VALUE) && 1959 (high != IWL_RATE_INVALID) && 1960 (low_tpt != IWL_INVALID_VALUE) && 1961 (low_tpt < current_tpt)) { 1962 IWL_DEBUG_RATE(mvm, 1963 "No data about high rate and low rate is worse. Increase rate\n"); 1964 return RS_ACTION_UPSCALE; 1965 } 1966 1967 if ((high_tpt != IWL_INVALID_VALUE) && 1968 (high_tpt > current_tpt)) { 1969 IWL_DEBUG_RATE(mvm, 1970 "Higher rate is better. Increate rate\n"); 1971 return RS_ACTION_UPSCALE; 1972 } 1973 1974 if ((low_tpt != IWL_INVALID_VALUE) && 1975 (high_tpt != IWL_INVALID_VALUE) && 1976 (low_tpt < current_tpt) && 1977 (high_tpt < current_tpt)) { 1978 IWL_DEBUG_RATE(mvm, 1979 "Both high and low are worse. Maintain rate\n"); 1980 return RS_ACTION_STAY; 1981 } 1982 1983 if ((low_tpt != IWL_INVALID_VALUE) && 1984 (low_tpt > current_tpt)) { 1985 IWL_DEBUG_RATE(mvm, 1986 "Lower rate is better\n"); 1987 action = RS_ACTION_DOWNSCALE; 1988 goto out; 1989 } 1990 1991 if ((low_tpt == IWL_INVALID_VALUE) && 1992 (low != IWL_RATE_INVALID)) { 1993 IWL_DEBUG_RATE(mvm, 1994 "No data about lower rate\n"); 1995 action = RS_ACTION_DOWNSCALE; 1996 goto out; 1997 } 1998 1999 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2000 2001 out: 2002 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2003 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2004 IWL_DEBUG_RATE(mvm, 2005 "SR is above NO DECREASE. Avoid downscale\n"); 2006 action = RS_ACTION_STAY; 2007 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2008 IWL_DEBUG_RATE(mvm, 2009 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2010 action = RS_ACTION_STAY; 2011 } else { 2012 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2013 } 2014 } 2015 2016 return action; 2017 } 2018 2019 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2020 struct iwl_lq_sta *lq_sta) 2021 { 2022 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2023 * supports STBC of at least 1*SS 2024 */ 2025 if (!lq_sta->stbc_capable) 2026 return false; 2027 2028 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2029 return false; 2030 2031 return true; 2032 } 2033 2034 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2035 int *weaker, int *stronger) 2036 { 2037 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2038 if (*weaker > TPC_MAX_REDUCTION) 2039 *weaker = TPC_INVALID; 2040 2041 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2042 if (*stronger < 0) 2043 *stronger = TPC_INVALID; 2044 } 2045 2046 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2047 struct rs_rate *rate, enum nl80211_band band) 2048 { 2049 int index = rate->index; 2050 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2051 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2052 !vif->bss_conf.ps); 2053 2054 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2055 cam, sta_ps_disabled); 2056 /* 2057 * allow tpc only if power management is enabled, or bt coex 2058 * activity grade allows it and we are on 2.4Ghz. 2059 */ 2060 if ((cam || sta_ps_disabled) && 2061 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2062 return false; 2063 2064 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2065 if (is_legacy(rate)) 2066 return index == IWL_RATE_54M_INDEX; 2067 if (is_ht(rate)) 2068 return index == IWL_RATE_MCS_7_INDEX; 2069 if (is_vht(rate)) 2070 return index == IWL_RATE_MCS_7_INDEX || 2071 index == IWL_RATE_MCS_8_INDEX || 2072 index == IWL_RATE_MCS_9_INDEX; 2073 2074 WARN_ON_ONCE(1); 2075 return false; 2076 } 2077 2078 enum tpc_action { 2079 TPC_ACTION_STAY, 2080 TPC_ACTION_DECREASE, 2081 TPC_ACTION_INCREASE, 2082 TPC_ACTION_NO_RESTIRCTION, 2083 }; 2084 2085 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2086 s32 sr, int weak, int strong, 2087 int current_tpt, 2088 int weak_tpt, int strong_tpt) 2089 { 2090 /* stay until we have valid tpt */ 2091 if (current_tpt == IWL_INVALID_VALUE) { 2092 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2093 return TPC_ACTION_STAY; 2094 } 2095 2096 /* Too many failures, increase txp */ 2097 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2098 current_tpt == 0) { 2099 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2100 return TPC_ACTION_NO_RESTIRCTION; 2101 } 2102 2103 /* try decreasing first if applicable */ 2104 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2105 weak != TPC_INVALID) { 2106 if (weak_tpt == IWL_INVALID_VALUE && 2107 (strong_tpt == IWL_INVALID_VALUE || 2108 current_tpt >= strong_tpt)) { 2109 IWL_DEBUG_RATE(mvm, 2110 "no weak txp measurement. decrease txp\n"); 2111 return TPC_ACTION_DECREASE; 2112 } 2113 2114 if (weak_tpt > current_tpt) { 2115 IWL_DEBUG_RATE(mvm, 2116 "lower txp has better tpt. decrease txp\n"); 2117 return TPC_ACTION_DECREASE; 2118 } 2119 } 2120 2121 /* next, increase if needed */ 2122 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2123 strong != TPC_INVALID) { 2124 if (weak_tpt == IWL_INVALID_VALUE && 2125 strong_tpt != IWL_INVALID_VALUE && 2126 current_tpt < strong_tpt) { 2127 IWL_DEBUG_RATE(mvm, 2128 "higher txp has better tpt. increase txp\n"); 2129 return TPC_ACTION_INCREASE; 2130 } 2131 2132 if (weak_tpt < current_tpt && 2133 (strong_tpt == IWL_INVALID_VALUE || 2134 strong_tpt > current_tpt)) { 2135 IWL_DEBUG_RATE(mvm, 2136 "lower txp has worse tpt. increase txp\n"); 2137 return TPC_ACTION_INCREASE; 2138 } 2139 } 2140 2141 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2142 return TPC_ACTION_STAY; 2143 } 2144 2145 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2146 struct ieee80211_sta *sta, 2147 struct iwl_lq_sta *lq_sta, 2148 struct iwl_scale_tbl_info *tbl) 2149 { 2150 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2151 struct ieee80211_vif *vif = mvm_sta->vif; 2152 struct ieee80211_chanctx_conf *chanctx_conf; 2153 enum nl80211_band band; 2154 struct iwl_rate_scale_data *window; 2155 struct rs_rate *rate = &tbl->rate; 2156 enum tpc_action action; 2157 s32 sr; 2158 u8 cur = lq_sta->lq.reduced_tpc; 2159 int current_tpt; 2160 int weak, strong; 2161 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2162 2163 #ifdef CONFIG_MAC80211_DEBUGFS 2164 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2165 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2166 lq_sta->pers.dbg_fixed_txp_reduction); 2167 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2168 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2169 } 2170 #endif 2171 2172 rcu_read_lock(); 2173 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2174 if (WARN_ON(!chanctx_conf)) 2175 band = NUM_NL80211_BANDS; 2176 else 2177 band = chanctx_conf->def.chan->band; 2178 rcu_read_unlock(); 2179 2180 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2181 IWL_DEBUG_RATE(mvm, 2182 "tpc is not allowed. remove txp restrictions\n"); 2183 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2184 return cur != TPC_NO_REDUCTION; 2185 } 2186 2187 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2188 2189 /* Collect measured throughputs for current and adjacent rates */ 2190 window = tbl->tpc_win; 2191 sr = window[cur].success_ratio; 2192 current_tpt = window[cur].average_tpt; 2193 if (weak != TPC_INVALID) 2194 weak_tpt = window[weak].average_tpt; 2195 if (strong != TPC_INVALID) 2196 strong_tpt = window[strong].average_tpt; 2197 2198 IWL_DEBUG_RATE(mvm, 2199 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2200 cur, current_tpt, sr, weak, strong, 2201 weak_tpt, strong_tpt); 2202 2203 action = rs_get_tpc_action(mvm, sr, weak, strong, 2204 current_tpt, weak_tpt, strong_tpt); 2205 2206 /* override actions if we are on the edge */ 2207 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2208 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2209 action = TPC_ACTION_STAY; 2210 } else if (strong == TPC_INVALID && 2211 (action == TPC_ACTION_INCREASE || 2212 action == TPC_ACTION_NO_RESTIRCTION)) { 2213 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2214 action = TPC_ACTION_STAY; 2215 } 2216 2217 switch (action) { 2218 case TPC_ACTION_DECREASE: 2219 lq_sta->lq.reduced_tpc = weak; 2220 return true; 2221 case TPC_ACTION_INCREASE: 2222 lq_sta->lq.reduced_tpc = strong; 2223 return true; 2224 case TPC_ACTION_NO_RESTIRCTION: 2225 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2226 return true; 2227 case TPC_ACTION_STAY: 2228 /* do nothing */ 2229 break; 2230 } 2231 return false; 2232 } 2233 2234 /* 2235 * Do rate scaling and search for new modulation mode. 2236 */ 2237 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2238 struct ieee80211_sta *sta, 2239 struct iwl_lq_sta *lq_sta, 2240 int tid, bool ndp) 2241 { 2242 int low = IWL_RATE_INVALID; 2243 int high = IWL_RATE_INVALID; 2244 int index; 2245 struct iwl_rate_scale_data *window = NULL; 2246 int current_tpt = IWL_INVALID_VALUE; 2247 int low_tpt = IWL_INVALID_VALUE; 2248 int high_tpt = IWL_INVALID_VALUE; 2249 u32 fail_count; 2250 enum rs_action scale_action = RS_ACTION_STAY; 2251 u16 rate_mask; 2252 u8 update_lq = 0; 2253 struct iwl_scale_tbl_info *tbl, *tbl1; 2254 u8 active_tbl = 0; 2255 u8 done_search = 0; 2256 u16 high_low; 2257 s32 sr; 2258 u8 prev_agg = lq_sta->is_agg; 2259 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2260 struct iwl_mvm_tid_data *tid_data; 2261 struct rs_rate *rate; 2262 2263 lq_sta->is_agg = !!sta_priv->agg_tids; 2264 2265 /* 2266 * Select rate-scale / modulation-mode table to work with in 2267 * the rest of this function: "search" if searching for better 2268 * modulation mode, or "active" if doing rate scaling within a mode. 2269 */ 2270 if (!lq_sta->search_better_tbl) 2271 active_tbl = lq_sta->active_tbl; 2272 else 2273 active_tbl = 1 - lq_sta->active_tbl; 2274 2275 tbl = &(lq_sta->lq_info[active_tbl]); 2276 rate = &tbl->rate; 2277 2278 if (prev_agg != lq_sta->is_agg) { 2279 IWL_DEBUG_RATE(mvm, 2280 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2281 prev_agg, lq_sta->is_agg); 2282 rs_set_expected_tpt_table(lq_sta, tbl); 2283 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2284 } 2285 2286 /* current tx rate */ 2287 index = rate->index; 2288 2289 /* rates available for this association, and for modulation mode */ 2290 rate_mask = rs_get_supported_rates(lq_sta, rate); 2291 2292 if (!(BIT(index) & rate_mask)) { 2293 IWL_ERR(mvm, "Current Rate is not valid\n"); 2294 if (lq_sta->search_better_tbl) { 2295 /* revert to active table if search table is not valid*/ 2296 rate->type = LQ_NONE; 2297 lq_sta->search_better_tbl = 0; 2298 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2299 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2300 } 2301 return; 2302 } 2303 2304 /* Get expected throughput table and history window for current rate */ 2305 if (!tbl->expected_tpt) { 2306 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2307 return; 2308 } 2309 2310 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2311 window = &(tbl->win[index]); 2312 2313 /* 2314 * If there is not enough history to calculate actual average 2315 * throughput, keep analyzing results of more tx frames, without 2316 * changing rate or mode (bypass most of the rest of this function). 2317 * Set up new rate table in uCode only if old rate is not supported 2318 * in current association (use new rate found above). 2319 */ 2320 fail_count = window->counter - window->success_counter; 2321 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2322 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2323 IWL_DEBUG_RATE(mvm, 2324 "%s: Test Window: succ %d total %d\n", 2325 rs_pretty_rate(rate), 2326 window->success_counter, window->counter); 2327 2328 /* Can't calculate this yet; not enough history */ 2329 window->average_tpt = IWL_INVALID_VALUE; 2330 2331 /* Should we stay with this modulation mode, 2332 * or search for a new one? */ 2333 rs_stay_in_table(lq_sta, false); 2334 2335 return; 2336 } 2337 2338 /* If we are searching for better modulation mode, check success. */ 2339 if (lq_sta->search_better_tbl) { 2340 /* If good success, continue using the "search" mode; 2341 * no need to send new link quality command, since we're 2342 * continuing to use the setup that we've been trying. */ 2343 if (window->average_tpt > lq_sta->last_tpt) { 2344 IWL_DEBUG_RATE(mvm, 2345 "SWITCHING TO NEW TABLE SR: %d " 2346 "cur-tpt %d old-tpt %d\n", 2347 window->success_ratio, 2348 window->average_tpt, 2349 lq_sta->last_tpt); 2350 2351 /* Swap tables; "search" becomes "active" */ 2352 lq_sta->active_tbl = active_tbl; 2353 current_tpt = window->average_tpt; 2354 /* Else poor success; go back to mode in "active" table */ 2355 } else { 2356 IWL_DEBUG_RATE(mvm, 2357 "GOING BACK TO THE OLD TABLE: SR %d " 2358 "cur-tpt %d old-tpt %d\n", 2359 window->success_ratio, 2360 window->average_tpt, 2361 lq_sta->last_tpt); 2362 2363 /* Nullify "search" table */ 2364 rate->type = LQ_NONE; 2365 2366 /* Revert to "active" table */ 2367 active_tbl = lq_sta->active_tbl; 2368 tbl = &(lq_sta->lq_info[active_tbl]); 2369 2370 /* Revert to "active" rate and throughput info */ 2371 index = tbl->rate.index; 2372 current_tpt = lq_sta->last_tpt; 2373 2374 /* Need to set up a new rate table in uCode */ 2375 update_lq = 1; 2376 } 2377 2378 /* Either way, we've made a decision; modulation mode 2379 * search is done, allow rate adjustment next time. */ 2380 lq_sta->search_better_tbl = 0; 2381 done_search = 1; /* Don't switch modes below! */ 2382 goto lq_update; 2383 } 2384 2385 /* (Else) not in search of better modulation mode, try for better 2386 * starting rate, while staying in this mode. */ 2387 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2388 low = high_low & 0xff; 2389 high = (high_low >> 8) & 0xff; 2390 2391 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2392 2393 sr = window->success_ratio; 2394 2395 /* Collect measured throughputs for current and adjacent rates */ 2396 current_tpt = window->average_tpt; 2397 if (low != IWL_RATE_INVALID) 2398 low_tpt = tbl->win[low].average_tpt; 2399 if (high != IWL_RATE_INVALID) 2400 high_tpt = tbl->win[high].average_tpt; 2401 2402 IWL_DEBUG_RATE(mvm, 2403 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2404 rs_pretty_rate(rate), current_tpt, sr, 2405 low, high, low_tpt, high_tpt); 2406 2407 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2408 current_tpt, low_tpt, high_tpt); 2409 2410 /* Force a search in case BT doesn't like us being in MIMO */ 2411 if (is_mimo(rate) && 2412 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2413 IWL_DEBUG_RATE(mvm, 2414 "BT Coex forbids MIMO. Search for new config\n"); 2415 rs_stay_in_table(lq_sta, true); 2416 goto lq_update; 2417 } 2418 2419 switch (scale_action) { 2420 case RS_ACTION_DOWNSCALE: 2421 /* Decrease starting rate, update uCode's rate table */ 2422 if (low != IWL_RATE_INVALID) { 2423 update_lq = 1; 2424 index = low; 2425 } else { 2426 IWL_DEBUG_RATE(mvm, 2427 "At the bottom rate. Can't decrease\n"); 2428 } 2429 2430 break; 2431 case RS_ACTION_UPSCALE: 2432 /* Increase starting rate, update uCode's rate table */ 2433 if (high != IWL_RATE_INVALID) { 2434 update_lq = 1; 2435 index = high; 2436 } else { 2437 IWL_DEBUG_RATE(mvm, 2438 "At the top rate. Can't increase\n"); 2439 } 2440 2441 break; 2442 case RS_ACTION_STAY: 2443 /* No change */ 2444 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2445 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2446 break; 2447 default: 2448 break; 2449 } 2450 2451 lq_update: 2452 /* Replace uCode's rate table for the destination station. */ 2453 if (update_lq) { 2454 tbl->rate.index = index; 2455 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2456 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2457 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2458 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2459 } 2460 2461 rs_stay_in_table(lq_sta, false); 2462 2463 /* 2464 * Search for new modulation mode if we're: 2465 * 1) Not changing rates right now 2466 * 2) Not just finishing up a search 2467 * 3) Allowing a new search 2468 */ 2469 if (!update_lq && !done_search && 2470 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2471 && window->counter) { 2472 enum rs_column next_column; 2473 2474 /* Save current throughput to compare with "search" throughput*/ 2475 lq_sta->last_tpt = current_tpt; 2476 2477 IWL_DEBUG_RATE(mvm, 2478 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2479 update_lq, done_search, lq_sta->rs_state, 2480 window->counter); 2481 2482 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2483 if (next_column != RS_COLUMN_INVALID) { 2484 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2485 next_column); 2486 if (!ret) 2487 lq_sta->search_better_tbl = 1; 2488 } else { 2489 IWL_DEBUG_RATE(mvm, 2490 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2491 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2492 } 2493 2494 /* If new "search" mode was selected, set up in uCode table */ 2495 if (lq_sta->search_better_tbl) { 2496 /* Access the "search" table, clear its history. */ 2497 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2498 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2499 2500 /* Use new "search" start rate */ 2501 index = tbl->rate.index; 2502 2503 rs_dump_rate(mvm, &tbl->rate, 2504 "Switch to SEARCH TABLE:"); 2505 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2506 } else { 2507 done_search = 1; 2508 } 2509 } 2510 2511 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2512 /* If the "active" (non-search) mode was legacy, 2513 * and we've tried switching antennas, 2514 * but we haven't been able to try HT modes (not available), 2515 * stay with best antenna legacy modulation for a while 2516 * before next round of mode comparisons. */ 2517 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2518 if (is_legacy(&tbl1->rate)) { 2519 IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n"); 2520 2521 if (tid != IWL_MAX_TID_COUNT) { 2522 tid_data = &sta_priv->tid_data[tid]; 2523 if (tid_data->state != IWL_AGG_OFF) { 2524 IWL_DEBUG_RATE(mvm, 2525 "Stop aggregation on tid %d\n", 2526 tid); 2527 ieee80211_stop_tx_ba_session(sta, tid); 2528 } 2529 } 2530 rs_set_stay_in_table(mvm, 1, lq_sta); 2531 } else { 2532 /* If we're in an HT mode, and all 3 mode switch actions 2533 * have been tried and compared, stay in this best modulation 2534 * mode for a while before next round of mode comparisons. */ 2535 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) && 2536 (lq_sta->tx_agg_tid_en & (1 << tid)) && 2537 (tid != IWL_MAX_TID_COUNT)) { 2538 tid_data = &sta_priv->tid_data[tid]; 2539 if (tid_data->state == IWL_AGG_OFF && !ndp) { 2540 IWL_DEBUG_RATE(mvm, 2541 "try to aggregate tid %d\n", 2542 tid); 2543 rs_tl_turn_on_agg(mvm, tid, 2544 lq_sta, sta); 2545 } 2546 } 2547 rs_set_stay_in_table(mvm, 0, lq_sta); 2548 } 2549 } 2550 } 2551 2552 struct rs_init_rate_info { 2553 s8 rssi; 2554 u8 rate_idx; 2555 }; 2556 2557 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2558 { -60, IWL_RATE_54M_INDEX }, 2559 { -64, IWL_RATE_48M_INDEX }, 2560 { -68, IWL_RATE_36M_INDEX }, 2561 { -80, IWL_RATE_24M_INDEX }, 2562 { -84, IWL_RATE_18M_INDEX }, 2563 { -85, IWL_RATE_12M_INDEX }, 2564 { -86, IWL_RATE_11M_INDEX }, 2565 { -88, IWL_RATE_5M_INDEX }, 2566 { -90, IWL_RATE_2M_INDEX }, 2567 { S8_MIN, IWL_RATE_1M_INDEX }, 2568 }; 2569 2570 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2571 { -60, IWL_RATE_54M_INDEX }, 2572 { -64, IWL_RATE_48M_INDEX }, 2573 { -72, IWL_RATE_36M_INDEX }, 2574 { -80, IWL_RATE_24M_INDEX }, 2575 { -84, IWL_RATE_18M_INDEX }, 2576 { -85, IWL_RATE_12M_INDEX }, 2577 { -87, IWL_RATE_9M_INDEX }, 2578 { S8_MIN, IWL_RATE_6M_INDEX }, 2579 }; 2580 2581 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2582 { -60, IWL_RATE_MCS_7_INDEX }, 2583 { -64, IWL_RATE_MCS_6_INDEX }, 2584 { -68, IWL_RATE_MCS_5_INDEX }, 2585 { -72, IWL_RATE_MCS_4_INDEX }, 2586 { -80, IWL_RATE_MCS_3_INDEX }, 2587 { -84, IWL_RATE_MCS_2_INDEX }, 2588 { -85, IWL_RATE_MCS_1_INDEX }, 2589 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2590 }; 2591 2592 /* MCS index 9 is not valid for 20MHz VHT channel width, 2593 * but is ok for 40, 80 and 160MHz channels. 2594 */ 2595 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2596 { -60, IWL_RATE_MCS_8_INDEX }, 2597 { -64, IWL_RATE_MCS_7_INDEX }, 2598 { -68, IWL_RATE_MCS_6_INDEX }, 2599 { -72, IWL_RATE_MCS_5_INDEX }, 2600 { -80, IWL_RATE_MCS_4_INDEX }, 2601 { -84, IWL_RATE_MCS_3_INDEX }, 2602 { -85, IWL_RATE_MCS_2_INDEX }, 2603 { -87, IWL_RATE_MCS_1_INDEX }, 2604 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2605 }; 2606 2607 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2608 { -60, IWL_RATE_MCS_9_INDEX }, 2609 { -64, IWL_RATE_MCS_8_INDEX }, 2610 { -68, IWL_RATE_MCS_7_INDEX }, 2611 { -72, IWL_RATE_MCS_6_INDEX }, 2612 { -80, IWL_RATE_MCS_5_INDEX }, 2613 { -84, IWL_RATE_MCS_4_INDEX }, 2614 { -85, IWL_RATE_MCS_3_INDEX }, 2615 { -87, IWL_RATE_MCS_2_INDEX }, 2616 { -88, IWL_RATE_MCS_1_INDEX }, 2617 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2618 }; 2619 2620 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2621 2622 /* Init the optimal rate based on STA caps 2623 * This combined with rssi is used to report the last tx rate 2624 * to userspace when we haven't transmitted enough frames. 2625 */ 2626 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2627 struct ieee80211_sta *sta, 2628 struct iwl_lq_sta *lq_sta) 2629 { 2630 struct rs_rate *rate = &lq_sta->optimal_rate; 2631 2632 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2633 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2634 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2635 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2636 else if (lq_sta->band == NL80211_BAND_5GHZ) 2637 rate->type = LQ_LEGACY_A; 2638 else 2639 rate->type = LQ_LEGACY_G; 2640 2641 rate->bw = rs_bw_from_sta_bw(sta); 2642 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2643 2644 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2645 2646 if (is_mimo(rate)) { 2647 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2648 } else if (is_siso(rate)) { 2649 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2650 } else { 2651 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2652 2653 if (lq_sta->band == NL80211_BAND_5GHZ) { 2654 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2655 lq_sta->optimal_nentries = 2656 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2657 } else { 2658 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2659 lq_sta->optimal_nentries = 2660 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2661 } 2662 } 2663 2664 if (is_vht(rate)) { 2665 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2666 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2667 lq_sta->optimal_nentries = 2668 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2669 } else { 2670 lq_sta->optimal_rates = rs_optimal_rates_vht; 2671 lq_sta->optimal_nentries = 2672 ARRAY_SIZE(rs_optimal_rates_vht); 2673 } 2674 } else if (is_ht(rate)) { 2675 lq_sta->optimal_rates = rs_optimal_rates_ht; 2676 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2677 } 2678 } 2679 2680 /* Compute the optimal rate index based on RSSI */ 2681 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2682 struct iwl_lq_sta *lq_sta) 2683 { 2684 struct rs_rate *rate = &lq_sta->optimal_rate; 2685 int i; 2686 2687 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2688 BITS_PER_LONG); 2689 2690 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2691 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2692 2693 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2694 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2695 rate->index = rate_idx; 2696 break; 2697 } 2698 } 2699 2700 return rate; 2701 } 2702 2703 /* Choose an initial legacy rate and antenna to use based on the RSSI 2704 * of last Rx 2705 */ 2706 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2707 struct ieee80211_sta *sta, 2708 struct iwl_lq_sta *lq_sta, 2709 enum nl80211_band band, 2710 struct rs_rate *rate) 2711 { 2712 int i, nentries; 2713 unsigned long active_rate; 2714 s8 best_rssi = S8_MIN; 2715 u8 best_ant = ANT_NONE; 2716 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2717 const struct rs_init_rate_info *initial_rates; 2718 2719 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2720 if (!(lq_sta->pers.chains & BIT(i))) 2721 continue; 2722 2723 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2724 best_rssi = lq_sta->pers.chain_signal[i]; 2725 best_ant = BIT(i); 2726 } 2727 } 2728 2729 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2730 rs_pretty_ant(best_ant), best_rssi); 2731 2732 if (best_ant != ANT_A && best_ant != ANT_B) 2733 rate->ant = first_antenna(valid_tx_ant); 2734 else 2735 rate->ant = best_ant; 2736 2737 rate->sgi = false; 2738 rate->ldpc = false; 2739 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2740 2741 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2742 BITS_PER_LONG); 2743 2744 if (band == NL80211_BAND_5GHZ) { 2745 rate->type = LQ_LEGACY_A; 2746 initial_rates = rs_optimal_rates_5ghz_legacy; 2747 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2748 } else { 2749 rate->type = LQ_LEGACY_G; 2750 initial_rates = rs_optimal_rates_24ghz_legacy; 2751 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2752 } 2753 2754 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2755 goto out; 2756 2757 /* Start from a higher rate if the corresponding debug capability 2758 * is enabled. The rate is chosen according to AP capabilities. 2759 * In case of VHT/HT when the rssi is low fallback to the case of 2760 * legacy rates. 2761 */ 2762 if (sta->vht_cap.vht_supported && 2763 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2764 switch (sta->bandwidth) { 2765 case IEEE80211_STA_RX_BW_160: 2766 case IEEE80211_STA_RX_BW_80: 2767 case IEEE80211_STA_RX_BW_40: 2768 initial_rates = rs_optimal_rates_vht; 2769 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2770 break; 2771 case IEEE80211_STA_RX_BW_20: 2772 initial_rates = rs_optimal_rates_vht_20mhz; 2773 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2774 break; 2775 default: 2776 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2777 goto out; 2778 } 2779 2780 active_rate = lq_sta->active_siso_rate; 2781 rate->type = LQ_VHT_SISO; 2782 rate->bw = rs_bw_from_sta_bw(sta); 2783 } else if (sta->ht_cap.ht_supported && 2784 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2785 initial_rates = rs_optimal_rates_ht; 2786 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2787 active_rate = lq_sta->active_siso_rate; 2788 rate->type = LQ_HT_SISO; 2789 } else { 2790 active_rate = lq_sta->active_legacy_rate; 2791 } 2792 2793 for (i = 0; i < nentries; i++) { 2794 int rate_idx = initial_rates[i].rate_idx; 2795 2796 if ((best_rssi >= initial_rates[i].rssi) && 2797 (BIT(rate_idx) & active_rate)) { 2798 rate->index = rate_idx; 2799 break; 2800 } 2801 } 2802 2803 out: 2804 rs_dump_rate(mvm, rate, "INITIAL"); 2805 } 2806 2807 /* Save info about RSSI of last Rx */ 2808 void rs_update_last_rssi(struct iwl_mvm *mvm, 2809 struct iwl_lq_sta *lq_sta, 2810 struct ieee80211_rx_status *rx_status) 2811 { 2812 int i; 2813 2814 lq_sta->pers.chains = rx_status->chains; 2815 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2816 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2817 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2818 lq_sta->pers.last_rssi = S8_MIN; 2819 2820 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2821 if (!(lq_sta->pers.chains & BIT(i))) 2822 continue; 2823 2824 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2825 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2826 } 2827 } 2828 2829 /** 2830 * rs_initialize_lq - Initialize a station's hardware rate table 2831 * 2832 * The uCode's station table contains a table of fallback rates 2833 * for automatic fallback during transmission. 2834 * 2835 * NOTE: This sets up a default set of values. These will be replaced later 2836 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2837 * rc80211_simple. 2838 * 2839 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2840 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2841 * which requires station table entry to exist). 2842 */ 2843 static void rs_initialize_lq(struct iwl_mvm *mvm, 2844 struct ieee80211_sta *sta, 2845 struct iwl_lq_sta *lq_sta, 2846 enum nl80211_band band, 2847 bool init) 2848 { 2849 struct iwl_scale_tbl_info *tbl; 2850 struct rs_rate *rate; 2851 u8 active_tbl = 0; 2852 2853 if (!sta || !lq_sta) 2854 return; 2855 2856 if (!lq_sta->search_better_tbl) 2857 active_tbl = lq_sta->active_tbl; 2858 else 2859 active_tbl = 1 - lq_sta->active_tbl; 2860 2861 tbl = &(lq_sta->lq_info[active_tbl]); 2862 rate = &tbl->rate; 2863 2864 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2865 rs_init_optimal_rate(mvm, sta, lq_sta); 2866 2867 WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B); 2868 tbl->column = rs_get_column_from_rate(rate); 2869 2870 rs_set_expected_tpt_table(lq_sta, tbl); 2871 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2872 /* TODO restore station should remember the lq cmd */ 2873 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init); 2874 } 2875 2876 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta, 2877 struct ieee80211_tx_rate_control *txrc) 2878 { 2879 struct sk_buff *skb = txrc->skb; 2880 struct iwl_op_mode *op_mode __maybe_unused = 2881 (struct iwl_op_mode *)mvm_r; 2882 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2884 struct iwl_lq_sta *lq_sta = mvm_sta; 2885 struct rs_rate *optimal_rate; 2886 u32 last_ucode_rate; 2887 2888 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2889 /* if vif isn't initialized mvm doesn't know about 2890 * this station, so don't do anything with the it 2891 */ 2892 sta = NULL; 2893 mvm_sta = NULL; 2894 } 2895 2896 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2897 2898 /* Treat uninitialized rate scaling data same as non-existing. */ 2899 if (lq_sta && !lq_sta->pers.drv) { 2900 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 2901 mvm_sta = NULL; 2902 } 2903 2904 /* Send management frames and NO_ACK data using lowest rate. */ 2905 if (rate_control_send_low(sta, mvm_sta, txrc)) 2906 return; 2907 2908 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2909 info->band, &info->control.rates[0]); 2910 info->control.rates[0].count = 1; 2911 2912 /* Report the optimal rate based on rssi and STA caps if we haven't 2913 * converged yet (too little traffic) or exploring other modulations 2914 */ 2915 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2916 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2917 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2918 optimal_rate); 2919 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2920 &txrc->reported_rate); 2921 } 2922 } 2923 2924 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2925 gfp_t gfp) 2926 { 2927 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 2928 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2929 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2930 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 2931 2932 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2933 2934 lq_sta->pers.drv = mvm; 2935 #ifdef CONFIG_MAC80211_DEBUGFS 2936 lq_sta->pers.dbg_fixed_rate = 0; 2937 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2938 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2939 #endif 2940 lq_sta->pers.chains = 0; 2941 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2942 lq_sta->pers.last_rssi = S8_MIN; 2943 2944 return &sta_priv->lq_sta; 2945 } 2946 2947 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2948 int nss) 2949 { 2950 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2951 (0x3 << (2 * (nss - 1))); 2952 rx_mcs >>= (2 * (nss - 1)); 2953 2954 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2955 return IWL_RATE_MCS_7_INDEX; 2956 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2957 return IWL_RATE_MCS_8_INDEX; 2958 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2959 return IWL_RATE_MCS_9_INDEX; 2960 2961 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2962 return -1; 2963 } 2964 2965 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2966 struct ieee80211_sta_vht_cap *vht_cap, 2967 struct iwl_lq_sta *lq_sta) 2968 { 2969 int i; 2970 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2971 2972 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2973 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2974 if (i == IWL_RATE_9M_INDEX) 2975 continue; 2976 2977 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2978 if (i == IWL_RATE_MCS_9_INDEX && 2979 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2980 continue; 2981 2982 lq_sta->active_siso_rate |= BIT(i); 2983 } 2984 } 2985 2986 if (sta->rx_nss < 2) 2987 return; 2988 2989 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2990 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2991 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2992 if (i == IWL_RATE_9M_INDEX) 2993 continue; 2994 2995 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2996 if (i == IWL_RATE_MCS_9_INDEX && 2997 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2998 continue; 2999 3000 lq_sta->active_mimo2_rate |= BIT(i); 3001 } 3002 } 3003 } 3004 3005 static void rs_ht_init(struct iwl_mvm *mvm, 3006 struct ieee80211_sta *sta, 3007 struct iwl_lq_sta *lq_sta, 3008 struct ieee80211_sta_ht_cap *ht_cap) 3009 { 3010 /* active_siso_rate mask includes 9 MBits (bit 5), 3011 * and CCK (bits 0-3), supp_rates[] does not; 3012 * shift to convert format, force 9 MBits off. 3013 */ 3014 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3015 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3016 lq_sta->active_siso_rate &= ~((u16)0x2); 3017 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3018 3019 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3020 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3021 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3022 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3023 3024 if (mvm->cfg->ht_params->ldpc && 3025 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3026 lq_sta->ldpc = true; 3027 3028 if (mvm->cfg->ht_params->stbc && 3029 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3030 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3031 lq_sta->stbc_capable = true; 3032 3033 lq_sta->is_vht = false; 3034 } 3035 3036 static void rs_vht_init(struct iwl_mvm *mvm, 3037 struct ieee80211_sta *sta, 3038 struct iwl_lq_sta *lq_sta, 3039 struct ieee80211_sta_vht_cap *vht_cap) 3040 { 3041 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3042 3043 if (mvm->cfg->ht_params->ldpc && 3044 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3045 lq_sta->ldpc = true; 3046 3047 if (mvm->cfg->ht_params->stbc && 3048 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3049 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3050 lq_sta->stbc_capable = true; 3051 3052 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3053 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3054 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3055 lq_sta->bfer_capable = true; 3056 3057 lq_sta->is_vht = true; 3058 } 3059 3060 #ifdef CONFIG_IWLWIFI_DEBUGFS 3061 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3062 { 3063 spin_lock_bh(&mvm->drv_stats_lock); 3064 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3065 spin_unlock_bh(&mvm->drv_stats_lock); 3066 } 3067 3068 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3069 { 3070 u8 nss = 0; 3071 3072 spin_lock(&mvm->drv_stats_lock); 3073 3074 if (agg) 3075 mvm->drv_rx_stats.agg_frames++; 3076 3077 mvm->drv_rx_stats.success_frames++; 3078 3079 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3080 case RATE_MCS_CHAN_WIDTH_20: 3081 mvm->drv_rx_stats.bw_20_frames++; 3082 break; 3083 case RATE_MCS_CHAN_WIDTH_40: 3084 mvm->drv_rx_stats.bw_40_frames++; 3085 break; 3086 case RATE_MCS_CHAN_WIDTH_80: 3087 mvm->drv_rx_stats.bw_80_frames++; 3088 break; 3089 case RATE_MCS_CHAN_WIDTH_160: 3090 mvm->drv_rx_stats.bw_160_frames++; 3091 break; 3092 default: 3093 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3094 } 3095 3096 if (rate & RATE_MCS_HT_MSK) { 3097 mvm->drv_rx_stats.ht_frames++; 3098 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3099 } else if (rate & RATE_MCS_VHT_MSK) { 3100 mvm->drv_rx_stats.vht_frames++; 3101 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3102 RATE_VHT_MCS_NSS_POS) + 1; 3103 } else { 3104 mvm->drv_rx_stats.legacy_frames++; 3105 } 3106 3107 if (nss == 1) 3108 mvm->drv_rx_stats.siso_frames++; 3109 else if (nss == 2) 3110 mvm->drv_rx_stats.mimo2_frames++; 3111 3112 if (rate & RATE_MCS_SGI_MSK) 3113 mvm->drv_rx_stats.sgi_frames++; 3114 else 3115 mvm->drv_rx_stats.ngi_frames++; 3116 3117 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3118 mvm->drv_rx_stats.last_frame_idx = 3119 (mvm->drv_rx_stats.last_frame_idx + 1) % 3120 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3121 3122 spin_unlock(&mvm->drv_stats_lock); 3123 } 3124 #endif 3125 3126 /* 3127 * Called after adding a new station to initialize rate scaling 3128 */ 3129 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3130 enum nl80211_band band, bool init) 3131 { 3132 int i, j; 3133 struct ieee80211_hw *hw = mvm->hw; 3134 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3135 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3136 struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta); 3137 struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta; 3138 struct ieee80211_supported_band *sband; 3139 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3140 3141 /* clear all non-persistent lq data */ 3142 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3143 3144 sband = hw->wiphy->bands[band]; 3145 3146 lq_sta->lq.sta_id = sta_priv->sta_id; 3147 sta_priv->tlc_amsdu = false; 3148 3149 for (j = 0; j < LQ_SIZE; j++) 3150 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3151 3152 lq_sta->flush_timer = 0; 3153 lq_sta->last_tx = jiffies; 3154 3155 IWL_DEBUG_RATE(mvm, 3156 "LQ: *** rate scale station global init for station %d ***\n", 3157 sta_priv->sta_id); 3158 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3159 * the lowest or the highest rate.. Could consider using RSSI from 3160 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3161 * after assoc.. */ 3162 3163 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3164 lq_sta->band = sband->band; 3165 /* 3166 * active legacy rates as per supported rates bitmap 3167 */ 3168 supp = sta->supp_rates[sband->band]; 3169 lq_sta->active_legacy_rate = 0; 3170 for_each_set_bit(i, &supp, BITS_PER_LONG) 3171 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3172 3173 /* TODO: should probably account for rx_highest for both HT/VHT */ 3174 if (!vht_cap || !vht_cap->vht_supported) 3175 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3176 else 3177 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3178 3179 lq_sta->max_legacy_rate_idx = 3180 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3181 lq_sta->max_siso_rate_idx = 3182 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3183 lq_sta->max_mimo2_rate_idx = 3184 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3185 3186 IWL_DEBUG_RATE(mvm, 3187 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3188 lq_sta->active_legacy_rate, 3189 lq_sta->active_siso_rate, 3190 lq_sta->active_mimo2_rate, 3191 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3192 lq_sta->bfer_capable); 3193 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3194 lq_sta->max_legacy_rate_idx, 3195 lq_sta->max_siso_rate_idx, 3196 lq_sta->max_mimo2_rate_idx); 3197 3198 /* These values will be overridden later */ 3199 lq_sta->lq.single_stream_ant_msk = 3200 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3201 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3202 3203 /* as default allow aggregation for all tids */ 3204 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3205 lq_sta->is_agg = 0; 3206 #ifdef CONFIG_IWLWIFI_DEBUGFS 3207 iwl_mvm_reset_frame_stats(mvm); 3208 #endif 3209 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3210 } 3211 3212 static void rs_rate_update(void *mvm_r, 3213 struct ieee80211_supported_band *sband, 3214 struct cfg80211_chan_def *chandef, 3215 struct ieee80211_sta *sta, void *priv_sta, 3216 u32 changed) 3217 { 3218 u8 tid; 3219 struct iwl_op_mode *op_mode = 3220 (struct iwl_op_mode *)mvm_r; 3221 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 3222 3223 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3224 return; 3225 3226 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3227 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3228 ieee80211_stop_tx_ba_session(sta, tid); 3229 3230 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3231 } 3232 3233 #ifdef CONFIG_MAC80211_DEBUGFS 3234 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3235 struct iwl_lq_cmd *lq_cmd, 3236 enum nl80211_band band, 3237 u32 ucode_rate) 3238 { 3239 struct rs_rate rate; 3240 int i; 3241 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3242 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3243 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3244 3245 for (i = 0; i < num_rates; i++) 3246 lq_cmd->rs_table[i] = ucode_rate_le32; 3247 3248 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3249 3250 if (is_mimo(&rate)) 3251 lq_cmd->mimo_delim = num_rates - 1; 3252 else 3253 lq_cmd->mimo_delim = 0; 3254 3255 lq_cmd->reduced_tpc = 0; 3256 3257 if (num_of_ant(ant) == 1) 3258 lq_cmd->single_stream_ant_msk = ant; 3259 3260 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3261 } 3262 #endif /* CONFIG_MAC80211_DEBUGFS */ 3263 3264 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3265 struct iwl_lq_sta *lq_sta, 3266 struct rs_rate *rate, 3267 __le32 *rs_table, int *rs_table_index, 3268 int num_rates, int num_retries, 3269 u8 valid_tx_ant, bool toggle_ant) 3270 { 3271 int i, j; 3272 __le32 ucode_rate; 3273 bool bottom_reached = false; 3274 int prev_rate_idx = rate->index; 3275 int end = LINK_QUAL_MAX_RETRY_NUM; 3276 int index = *rs_table_index; 3277 3278 for (i = 0; i < num_rates && index < end; i++) { 3279 for (j = 0; j < num_retries && index < end; j++, index++) { 3280 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3281 rate)); 3282 rs_table[index] = ucode_rate; 3283 if (toggle_ant) 3284 rs_toggle_antenna(valid_tx_ant, rate); 3285 } 3286 3287 prev_rate_idx = rate->index; 3288 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3289 if (bottom_reached && !is_legacy(rate)) 3290 break; 3291 } 3292 3293 if (!bottom_reached && !is_legacy(rate)) 3294 rate->index = prev_rate_idx; 3295 3296 *rs_table_index = index; 3297 } 3298 3299 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3300 * column the rate table should look like this: 3301 * 3302 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3303 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3304 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3305 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3306 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3307 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3308 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3309 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3310 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3311 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3312 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3313 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3314 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3315 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3316 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3317 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3318 */ 3319 static void rs_build_rates_table(struct iwl_mvm *mvm, 3320 struct ieee80211_sta *sta, 3321 struct iwl_lq_sta *lq_sta, 3322 const struct rs_rate *initial_rate) 3323 { 3324 struct rs_rate rate; 3325 int num_rates, num_retries, index = 0; 3326 u8 valid_tx_ant = 0; 3327 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3328 bool toggle_ant = false; 3329 3330 memcpy(&rate, initial_rate, sizeof(rate)); 3331 3332 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3333 3334 /* TODO: remove old API when min FW API hits 14 */ 3335 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3336 rs_stbc_allow(mvm, sta, lq_sta)) 3337 rate.stbc = true; 3338 3339 if (is_siso(&rate)) { 3340 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3341 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3342 } else if (is_mimo(&rate)) { 3343 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3344 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3345 } else { 3346 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3347 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3348 toggle_ant = true; 3349 } 3350 3351 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3352 num_rates, num_retries, valid_tx_ant, 3353 toggle_ant); 3354 3355 rs_get_lower_rate_down_column(lq_sta, &rate); 3356 3357 if (is_siso(&rate)) { 3358 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3359 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3360 lq_cmd->mimo_delim = index; 3361 } else if (is_legacy(&rate)) { 3362 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3363 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3364 } else { 3365 WARN_ON_ONCE(1); 3366 } 3367 3368 toggle_ant = true; 3369 3370 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3371 num_rates, num_retries, valid_tx_ant, 3372 toggle_ant); 3373 3374 rs_get_lower_rate_down_column(lq_sta, &rate); 3375 3376 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3377 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3378 3379 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3380 num_rates, num_retries, valid_tx_ant, 3381 toggle_ant); 3382 3383 } 3384 3385 struct rs_bfer_active_iter_data { 3386 struct ieee80211_sta *exclude_sta; 3387 struct iwl_mvm_sta *bfer_mvmsta; 3388 }; 3389 3390 static void rs_bfer_active_iter(void *_data, 3391 struct ieee80211_sta *sta) 3392 { 3393 struct rs_bfer_active_iter_data *data = _data; 3394 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3395 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.lq; 3396 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3397 3398 if (sta == data->exclude_sta) 3399 return; 3400 3401 /* The current sta has BFER allowed */ 3402 if (ss_params & LQ_SS_BFER_ALLOWED) { 3403 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3404 3405 data->bfer_mvmsta = mvmsta; 3406 } 3407 } 3408 3409 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3410 { 3411 int prio = -1; 3412 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3413 3414 switch (viftype) { 3415 case NL80211_IFTYPE_AP: 3416 case NL80211_IFTYPE_P2P_GO: 3417 prio = 3; 3418 break; 3419 case NL80211_IFTYPE_P2P_CLIENT: 3420 prio = 2; 3421 break; 3422 case NL80211_IFTYPE_STATION: 3423 prio = 1; 3424 break; 3425 default: 3426 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3427 prio = -1; 3428 } 3429 3430 return prio; 3431 } 3432 3433 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3434 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3435 struct iwl_mvm_sta *sta2) 3436 { 3437 int prio1 = rs_bfer_priority(sta1); 3438 int prio2 = rs_bfer_priority(sta2); 3439 3440 if (prio1 > prio2) 3441 return 1; 3442 if (prio1 < prio2) 3443 return -1; 3444 return 0; 3445 } 3446 3447 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3448 struct ieee80211_sta *sta, 3449 struct iwl_lq_sta *lq_sta, 3450 const struct rs_rate *initial_rate) 3451 { 3452 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3453 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3454 struct rs_bfer_active_iter_data data = { 3455 .exclude_sta = sta, 3456 .bfer_mvmsta = NULL, 3457 }; 3458 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3459 u32 ss_params = LQ_SS_PARAMS_VALID; 3460 3461 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3462 goto out; 3463 3464 #ifdef CONFIG_MAC80211_DEBUGFS 3465 /* Check if forcing the decision is configured. 3466 * Note that SISO is forced by not allowing STBC or BFER 3467 */ 3468 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3469 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3470 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3471 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3472 3473 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3474 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3475 lq_sta->pers.ss_force); 3476 goto out; 3477 } 3478 #endif 3479 3480 if (lq_sta->stbc_capable) 3481 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3482 3483 if (!lq_sta->bfer_capable) 3484 goto out; 3485 3486 ieee80211_iterate_stations_atomic(mvm->hw, 3487 rs_bfer_active_iter, 3488 &data); 3489 bfer_mvmsta = data.bfer_mvmsta; 3490 3491 /* This code is safe as it doesn't run concurrently for different 3492 * stations. This is guaranteed by the fact that calls to 3493 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3494 */ 3495 if (!bfer_mvmsta) { 3496 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3497 3498 ss_params |= LQ_SS_BFER_ALLOWED; 3499 goto out; 3500 } 3501 3502 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3503 bfer_mvmsta->sta_id); 3504 3505 /* Disallow BFER on another STA if active and we're a higher priority */ 3506 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3507 struct iwl_lq_cmd *bfersta_lq_cmd = &bfer_mvmsta->lq_sta.lq; 3508 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3509 3510 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3511 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3512 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3513 3514 ss_params |= LQ_SS_BFER_ALLOWED; 3515 IWL_DEBUG_RATE(mvm, 3516 "Lower priority BFER sta found (%d). Switch BFER\n", 3517 bfer_mvmsta->sta_id); 3518 } 3519 out: 3520 lq_cmd->ss_params = cpu_to_le32(ss_params); 3521 } 3522 3523 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3524 struct ieee80211_sta *sta, 3525 struct iwl_lq_sta *lq_sta, 3526 const struct rs_rate *initial_rate) 3527 { 3528 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3529 struct iwl_mvm_sta *mvmsta; 3530 struct iwl_mvm_vif *mvmvif; 3531 3532 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3533 lq_cmd->agg_time_limit = 3534 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3535 3536 #ifdef CONFIG_MAC80211_DEBUGFS 3537 if (lq_sta->pers.dbg_fixed_rate) { 3538 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3539 lq_sta->band, 3540 lq_sta->pers.dbg_fixed_rate); 3541 return; 3542 } 3543 #endif 3544 if (WARN_ON_ONCE(!sta || !initial_rate)) 3545 return; 3546 3547 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3548 3549 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3550 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3551 3552 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3553 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3554 3555 if (num_of_ant(initial_rate->ant) == 1) 3556 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3557 3558 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3559 3560 /* 3561 * In case of low latency, tell the firmware to leave a frame in the 3562 * Tx Fifo so that it can start a transaction in the same TxOP. This 3563 * basically allows the firmware to send bursts. 3564 */ 3565 if (iwl_mvm_vif_low_latency(mvmvif)) 3566 lq_cmd->agg_frame_cnt_limit--; 3567 3568 if (mvmsta->vif->p2p) 3569 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3570 3571 lq_cmd->agg_time_limit = 3572 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3573 } 3574 3575 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3576 { 3577 return hw->priv; 3578 } 3579 /* rate scale requires free function to be implemented */ 3580 static void rs_free(void *mvm_rate) 3581 { 3582 return; 3583 } 3584 3585 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, 3586 void *mvm_sta) 3587 { 3588 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3589 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3590 3591 IWL_DEBUG_RATE(mvm, "enter\n"); 3592 IWL_DEBUG_RATE(mvm, "leave\n"); 3593 } 3594 3595 #ifdef CONFIG_MAC80211_DEBUGFS 3596 int rs_pretty_print_rate(char *buf, const u32 rate) 3597 { 3598 3599 char *type, *bw; 3600 u8 mcs = 0, nss = 0; 3601 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3602 3603 if (!(rate & RATE_MCS_HT_MSK) && 3604 !(rate & RATE_MCS_VHT_MSK)) { 3605 int index = iwl_hwrate_to_plcp_idx(rate); 3606 3607 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n", 3608 rs_pretty_ant(ant), 3609 index == IWL_RATE_INVALID ? "BAD" : 3610 iwl_rate_mcs[index].mbps); 3611 } 3612 3613 if (rate & RATE_MCS_VHT_MSK) { 3614 type = "VHT"; 3615 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3616 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3617 >> RATE_VHT_MCS_NSS_POS) + 1; 3618 } else if (rate & RATE_MCS_HT_MSK) { 3619 type = "HT"; 3620 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3621 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3622 >> RATE_HT_MCS_NSS_POS) + 1; 3623 } else { 3624 type = "Unknown"; /* shouldn't happen */ 3625 } 3626 3627 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3628 case RATE_MCS_CHAN_WIDTH_20: 3629 bw = "20Mhz"; 3630 break; 3631 case RATE_MCS_CHAN_WIDTH_40: 3632 bw = "40Mhz"; 3633 break; 3634 case RATE_MCS_CHAN_WIDTH_80: 3635 bw = "80Mhz"; 3636 break; 3637 case RATE_MCS_CHAN_WIDTH_160: 3638 bw = "160Mhz"; 3639 break; 3640 default: 3641 bw = "BAD BW"; 3642 } 3643 3644 return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3645 type, rs_pretty_ant(ant), bw, mcs, nss, 3646 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3647 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3648 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3649 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3650 } 3651 3652 /** 3653 * Program the device to use fixed rate for frame transmit 3654 * This is for debugging/testing only 3655 * once the device start use fixed rate, we need to reload the module 3656 * to being back the normal operation. 3657 */ 3658 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3659 struct iwl_lq_sta *lq_sta) 3660 { 3661 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3662 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3663 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3664 3665 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3666 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3667 3668 if (lq_sta->pers.dbg_fixed_rate) { 3669 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3670 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3671 } 3672 } 3673 3674 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3675 const char __user *user_buf, size_t count, loff_t *ppos) 3676 { 3677 struct iwl_lq_sta *lq_sta = file->private_data; 3678 struct iwl_mvm *mvm; 3679 char buf[64]; 3680 size_t buf_size; 3681 u32 parsed_rate; 3682 3683 mvm = lq_sta->pers.drv; 3684 memset(buf, 0, sizeof(buf)); 3685 buf_size = min(count, sizeof(buf) - 1); 3686 if (copy_from_user(buf, user_buf, buf_size)) 3687 return -EFAULT; 3688 3689 if (sscanf(buf, "%x", &parsed_rate) == 1) 3690 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3691 else 3692 lq_sta->pers.dbg_fixed_rate = 0; 3693 3694 rs_program_fix_rate(mvm, lq_sta); 3695 3696 return count; 3697 } 3698 3699 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3700 char __user *user_buf, size_t count, loff_t *ppos) 3701 { 3702 char *buff; 3703 int desc = 0; 3704 int i = 0; 3705 ssize_t ret; 3706 3707 struct iwl_lq_sta *lq_sta = file->private_data; 3708 struct iwl_mvm_sta *mvmsta = 3709 container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 3710 struct iwl_mvm *mvm; 3711 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3712 struct rs_rate *rate = &tbl->rate; 3713 u32 ss_params; 3714 3715 mvm = lq_sta->pers.drv; 3716 buff = kmalloc(2048, GFP_KERNEL); 3717 if (!buff) 3718 return -ENOMEM; 3719 3720 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id); 3721 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n", 3722 lq_sta->total_failed, lq_sta->total_success, 3723 lq_sta->active_legacy_rate); 3724 desc += sprintf(buff+desc, "fixed rate 0x%X\n", 3725 lq_sta->pers.dbg_fixed_rate); 3726 desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n", 3727 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3728 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3729 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3730 desc += sprintf(buff+desc, "lq type %s\n", 3731 (is_legacy(rate)) ? "legacy" : 3732 is_vht(rate) ? "VHT" : "HT"); 3733 if (!is_legacy(rate)) { 3734 desc += sprintf(buff + desc, " %s", 3735 (is_siso(rate)) ? "SISO" : "MIMO2"); 3736 desc += sprintf(buff + desc, " %s", 3737 (is_ht20(rate)) ? "20MHz" : 3738 (is_ht40(rate)) ? "40MHz" : 3739 (is_ht80(rate)) ? "80MHz" : 3740 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3741 desc += sprintf(buff + desc, " %s %s %s %s\n", 3742 (rate->sgi) ? "SGI" : "NGI", 3743 (rate->ldpc) ? "LDPC" : "BCC", 3744 (lq_sta->is_agg) ? "AGG on" : "", 3745 (mvmsta->tlc_amsdu) ? "AMSDU on" : ""); 3746 } 3747 desc += sprintf(buff+desc, "last tx rate=0x%X\n", 3748 lq_sta->last_rate_n_flags); 3749 desc += sprintf(buff+desc, 3750 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3751 lq_sta->lq.flags, 3752 lq_sta->lq.mimo_delim, 3753 lq_sta->lq.single_stream_ant_msk, 3754 lq_sta->lq.dual_stream_ant_msk); 3755 3756 desc += sprintf(buff+desc, 3757 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3758 le16_to_cpu(lq_sta->lq.agg_time_limit), 3759 lq_sta->lq.agg_disable_start_th, 3760 lq_sta->lq.agg_frame_cnt_limit); 3761 3762 desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc); 3763 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3764 desc += sprintf(buff+desc, "single stream params: %s%s%s%s\n", 3765 (ss_params & LQ_SS_PARAMS_VALID) ? 3766 "VALID" : "INVALID", 3767 (ss_params & LQ_SS_BFER_ALLOWED) ? 3768 ", BFER" : "", 3769 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3770 ", STBC" : "", 3771 (ss_params & LQ_SS_FORCE) ? 3772 ", FORCE" : ""); 3773 desc += sprintf(buff+desc, 3774 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3775 lq_sta->lq.initial_rate_index[0], 3776 lq_sta->lq.initial_rate_index[1], 3777 lq_sta->lq.initial_rate_index[2], 3778 lq_sta->lq.initial_rate_index[3]); 3779 3780 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3781 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3782 3783 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r); 3784 desc += rs_pretty_print_rate(buff+desc, r); 3785 } 3786 3787 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3788 kfree(buff); 3789 return ret; 3790 } 3791 3792 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3793 .write = rs_sta_dbgfs_scale_table_write, 3794 .read = rs_sta_dbgfs_scale_table_read, 3795 .open = simple_open, 3796 .llseek = default_llseek, 3797 }; 3798 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3799 char __user *user_buf, size_t count, loff_t *ppos) 3800 { 3801 char *buff; 3802 int desc = 0; 3803 int i, j; 3804 ssize_t ret; 3805 struct iwl_scale_tbl_info *tbl; 3806 struct rs_rate *rate; 3807 struct iwl_lq_sta *lq_sta = file->private_data; 3808 3809 buff = kmalloc(1024, GFP_KERNEL); 3810 if (!buff) 3811 return -ENOMEM; 3812 3813 for (i = 0; i < LQ_SIZE; i++) { 3814 tbl = &(lq_sta->lq_info[i]); 3815 rate = &tbl->rate; 3816 desc += sprintf(buff+desc, 3817 "%s type=%d SGI=%d BW=%s DUP=0\n" 3818 "index=%d\n", 3819 lq_sta->active_tbl == i ? "*" : "x", 3820 rate->type, 3821 rate->sgi, 3822 is_ht20(rate) ? "20MHz" : 3823 is_ht40(rate) ? "40MHz" : 3824 is_ht80(rate) ? "80MHz" : 3825 is_ht160(rate) ? "160MHz" : "ERR", 3826 rate->index); 3827 for (j = 0; j < IWL_RATE_COUNT; j++) { 3828 desc += sprintf(buff+desc, 3829 "counter=%d success=%d %%=%d\n", 3830 tbl->win[j].counter, 3831 tbl->win[j].success_counter, 3832 tbl->win[j].success_ratio); 3833 } 3834 } 3835 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3836 kfree(buff); 3837 return ret; 3838 } 3839 3840 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3841 .read = rs_sta_dbgfs_stats_table_read, 3842 .open = simple_open, 3843 .llseek = default_llseek, 3844 }; 3845 3846 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3847 char __user *user_buf, 3848 size_t count, loff_t *ppos) 3849 { 3850 static const char * const column_name[] = { 3851 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3852 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3853 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3854 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3855 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3856 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3857 [RS_COLUMN_MIMO2] = "MIMO2", 3858 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3859 }; 3860 3861 static const char * const rate_name[] = { 3862 [IWL_RATE_1M_INDEX] = "1M", 3863 [IWL_RATE_2M_INDEX] = "2M", 3864 [IWL_RATE_5M_INDEX] = "5.5M", 3865 [IWL_RATE_11M_INDEX] = "11M", 3866 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3867 [IWL_RATE_9M_INDEX] = "9M", 3868 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3869 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3870 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3871 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3872 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3873 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3874 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3875 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3876 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3877 }; 3878 3879 char *buff, *pos, *endpos; 3880 int col, rate; 3881 ssize_t ret; 3882 struct iwl_lq_sta *lq_sta = file->private_data; 3883 struct rs_rate_stats *stats; 3884 static const size_t bufsz = 1024; 3885 3886 buff = kmalloc(bufsz, GFP_KERNEL); 3887 if (!buff) 3888 return -ENOMEM; 3889 3890 pos = buff; 3891 endpos = pos + bufsz; 3892 3893 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3894 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3895 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3896 pos += scnprintf(pos, endpos - pos, "\n"); 3897 3898 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3899 pos += scnprintf(pos, endpos - pos, 3900 "%s,", column_name[col]); 3901 3902 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3903 stats = &(lq_sta->pers.tx_stats[col][rate]); 3904 pos += scnprintf(pos, endpos - pos, 3905 "%llu/%llu,", 3906 stats->success, 3907 stats->total); 3908 } 3909 pos += scnprintf(pos, endpos - pos, "\n"); 3910 } 3911 3912 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3913 kfree(buff); 3914 return ret; 3915 } 3916 3917 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3918 const char __user *user_buf, 3919 size_t count, loff_t *ppos) 3920 { 3921 struct iwl_lq_sta *lq_sta = file->private_data; 3922 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3923 3924 return count; 3925 } 3926 3927 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3928 .read = rs_sta_dbgfs_drv_tx_stats_read, 3929 .write = rs_sta_dbgfs_drv_tx_stats_write, 3930 .open = simple_open, 3931 .llseek = default_llseek, 3932 }; 3933 3934 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3935 char __user *user_buf, 3936 size_t count, loff_t *ppos) 3937 { 3938 struct iwl_lq_sta *lq_sta = file->private_data; 3939 char buf[12]; 3940 int bufsz = sizeof(buf); 3941 int pos = 0; 3942 static const char * const ss_force_name[] = { 3943 [RS_SS_FORCE_NONE] = "none", 3944 [RS_SS_FORCE_STBC] = "stbc", 3945 [RS_SS_FORCE_BFER] = "bfer", 3946 [RS_SS_FORCE_SISO] = "siso", 3947 }; 3948 3949 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3950 ss_force_name[lq_sta->pers.ss_force]); 3951 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3952 } 3953 3954 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3955 size_t count, loff_t *ppos) 3956 { 3957 struct iwl_mvm *mvm = lq_sta->pers.drv; 3958 int ret = 0; 3959 3960 if (!strncmp("none", buf, 4)) { 3961 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3962 } else if (!strncmp("siso", buf, 4)) { 3963 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3964 } else if (!strncmp("stbc", buf, 4)) { 3965 if (lq_sta->stbc_capable) { 3966 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3967 } else { 3968 IWL_ERR(mvm, 3969 "can't force STBC. peer doesn't support\n"); 3970 ret = -EINVAL; 3971 } 3972 } else if (!strncmp("bfer", buf, 4)) { 3973 if (lq_sta->bfer_capable) { 3974 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3975 } else { 3976 IWL_ERR(mvm, 3977 "can't force BFER. peer doesn't support\n"); 3978 ret = -EINVAL; 3979 } 3980 } else { 3981 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3982 ret = -EINVAL; 3983 } 3984 return ret ?: count; 3985 } 3986 3987 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 3988 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 3989 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 3990 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 3991 &iwl_dbgfs_##name##_ops)) \ 3992 goto err; \ 3993 } while (0) 3994 3995 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 3996 3997 static void rs_add_debugfs(void *mvm, void *priv_sta, struct dentry *dir) 3998 { 3999 struct iwl_lq_sta *lq_sta = priv_sta; 4000 struct iwl_mvm_sta *mvmsta; 4001 4002 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta); 4003 4004 if (!mvmsta->vif) 4005 return; 4006 4007 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir, 4008 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4009 debugfs_create_file("rate_stats_table", S_IRUSR, dir, 4010 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4011 debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir, 4012 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4013 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir, 4014 &lq_sta->tx_agg_tid_en); 4015 debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir, 4016 &lq_sta->pers.dbg_fixed_txp_reduction); 4017 4018 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR); 4019 return; 4020 err: 4021 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4022 } 4023 4024 static void rs_remove_debugfs(void *mvm, void *mvm_sta) 4025 { 4026 } 4027 #endif 4028 4029 /* 4030 * Initialization of rate scaling information is done by driver after 4031 * the station is added. Since mac80211 calls this function before a 4032 * station is added we ignore it. 4033 */ 4034 static void rs_rate_init_stub(void *mvm_r, 4035 struct ieee80211_supported_band *sband, 4036 struct cfg80211_chan_def *chandef, 4037 struct ieee80211_sta *sta, void *mvm_sta) 4038 { 4039 } 4040 4041 static const struct rate_control_ops rs_mvm_ops = { 4042 .name = RS_NAME, 4043 .tx_status = rs_mac80211_tx_status, 4044 .get_rate = rs_get_rate, 4045 .rate_init = rs_rate_init_stub, 4046 .alloc = rs_alloc, 4047 .free = rs_free, 4048 .alloc_sta = rs_alloc_sta, 4049 .free_sta = rs_free_sta, 4050 .rate_update = rs_rate_update, 4051 #ifdef CONFIG_MAC80211_DEBUGFS 4052 .add_sta_debugfs = rs_add_debugfs, 4053 .remove_sta_debugfs = rs_remove_debugfs, 4054 #endif 4055 }; 4056 4057 int iwl_mvm_rate_control_register(void) 4058 { 4059 return ieee80211_rate_control_register(&rs_mvm_ops); 4060 } 4061 4062 void iwl_mvm_rate_control_unregister(void) 4063 { 4064 ieee80211_rate_control_unregister(&rs_mvm_ops); 4065 } 4066 4067 /** 4068 * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable 4069 * Tx protection, according to this request and previous requests, 4070 * and send the LQ command. 4071 * @mvmsta: The station 4072 * @enable: Enable Tx protection? 4073 */ 4074 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4075 bool enable) 4076 { 4077 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq; 4078 4079 lockdep_assert_held(&mvm->mutex); 4080 4081 if (enable) { 4082 if (mvmsta->tx_protection == 0) 4083 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4084 mvmsta->tx_protection++; 4085 } else { 4086 mvmsta->tx_protection--; 4087 if (mvmsta->tx_protection == 0) 4088 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4089 } 4090 4091 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4092 } 4093