1 /****************************************************************************** 2 * 3 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 5 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 19 * 20 * The full GNU General Public License is included in this distribution in the 21 * file called LICENSE. 22 * 23 * Contact Information: 24 * Intel Linux Wireless <linuxwifi@intel.com> 25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 26 * 27 *****************************************************************************/ 28 #include <linux/kernel.h> 29 #include <linux/skbuff.h> 30 #include <linux/slab.h> 31 #include <net/mac80211.h> 32 33 #include <linux/netdevice.h> 34 #include <linux/etherdevice.h> 35 #include <linux/delay.h> 36 37 #include <linux/workqueue.h> 38 #include "rs.h" 39 #include "fw-api.h" 40 #include "sta.h" 41 #include "iwl-op-mode.h" 42 #include "mvm.h" 43 #include "debugfs.h" 44 45 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 46 47 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 48 * Use this macro when dealing with thresholds consts set as a percentage 49 */ 50 #define RS_PERCENT(x) (128 * x) 51 52 static u8 rs_ht_to_legacy[] = { 53 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 54 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 55 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 56 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 57 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 58 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 59 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 60 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 61 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 62 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 63 }; 64 65 static const u8 ant_toggle_lookup[] = { 66 [ANT_NONE] = ANT_NONE, 67 [ANT_A] = ANT_B, 68 [ANT_B] = ANT_A, 69 [ANT_AB] = ANT_AB, 70 }; 71 72 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 73 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 74 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 75 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 76 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 77 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 78 IWL_RATE_##rp##M_INDEX, \ 79 IWL_RATE_##rn##M_INDEX } 80 81 #define IWL_DECLARE_MCS_RATE(s) \ 82 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 83 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 84 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 85 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 86 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 87 IWL_RATE_INVM_INDEX, \ 88 IWL_RATE_INVM_INDEX } 89 90 /* 91 * Parameter order: 92 * rate, ht rate, prev rate, next rate 93 * 94 * If there isn't a valid next or previous rate then INV is used which 95 * maps to IWL_RATE_INVALID 96 * 97 */ 98 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 99 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 100 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 101 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 102 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 103 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 104 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 105 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 106 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 107 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 108 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 109 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 110 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 111 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 112 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 113 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 114 }; 115 116 enum rs_action { 117 RS_ACTION_STAY = 0, 118 RS_ACTION_DOWNSCALE = -1, 119 RS_ACTION_UPSCALE = 1, 120 }; 121 122 enum rs_column_mode { 123 RS_INVALID = 0, 124 RS_LEGACY, 125 RS_SISO, 126 RS_MIMO2, 127 }; 128 129 #define MAX_NEXT_COLUMNS 7 130 #define MAX_COLUMN_CHECKS 3 131 132 struct rs_tx_column; 133 134 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 135 struct ieee80211_sta *sta, 136 struct rs_rate *rate, 137 const struct rs_tx_column *next_col); 138 139 struct rs_tx_column { 140 enum rs_column_mode mode; 141 u8 ant; 142 bool sgi; 143 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 144 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 145 }; 146 147 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 148 struct rs_rate *rate, 149 const struct rs_tx_column *next_col) 150 { 151 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 152 } 153 154 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 155 struct rs_rate *rate, 156 const struct rs_tx_column *next_col) 157 { 158 if (!sta->ht_cap.ht_supported) 159 return false; 160 161 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 162 return false; 163 164 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 165 return false; 166 167 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 168 return false; 169 170 if (mvm->nvm_data->sku_cap_mimo_disabled) 171 return false; 172 173 return true; 174 } 175 176 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 177 struct rs_rate *rate, 178 const struct rs_tx_column *next_col) 179 { 180 if (!sta->ht_cap.ht_supported) 181 return false; 182 183 return true; 184 } 185 186 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 187 struct rs_rate *rate, 188 const struct rs_tx_column *next_col) 189 { 190 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 191 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 192 193 if (is_ht20(rate) && (ht_cap->cap & 194 IEEE80211_HT_CAP_SGI_20)) 195 return true; 196 if (is_ht40(rate) && (ht_cap->cap & 197 IEEE80211_HT_CAP_SGI_40)) 198 return true; 199 if (is_ht80(rate) && (vht_cap->cap & 200 IEEE80211_VHT_CAP_SHORT_GI_80)) 201 return true; 202 if (is_ht160(rate) && (vht_cap->cap & 203 IEEE80211_VHT_CAP_SHORT_GI_160)) 204 return true; 205 206 return false; 207 } 208 209 static const struct rs_tx_column rs_tx_columns[] = { 210 [RS_COLUMN_LEGACY_ANT_A] = { 211 .mode = RS_LEGACY, 212 .ant = ANT_A, 213 .next_columns = { 214 RS_COLUMN_LEGACY_ANT_B, 215 RS_COLUMN_SISO_ANT_A, 216 RS_COLUMN_MIMO2, 217 RS_COLUMN_INVALID, 218 RS_COLUMN_INVALID, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 }, 222 .checks = { 223 rs_ant_allow, 224 }, 225 }, 226 [RS_COLUMN_LEGACY_ANT_B] = { 227 .mode = RS_LEGACY, 228 .ant = ANT_B, 229 .next_columns = { 230 RS_COLUMN_LEGACY_ANT_A, 231 RS_COLUMN_SISO_ANT_B, 232 RS_COLUMN_MIMO2, 233 RS_COLUMN_INVALID, 234 RS_COLUMN_INVALID, 235 RS_COLUMN_INVALID, 236 RS_COLUMN_INVALID, 237 }, 238 .checks = { 239 rs_ant_allow, 240 }, 241 }, 242 [RS_COLUMN_SISO_ANT_A] = { 243 .mode = RS_SISO, 244 .ant = ANT_A, 245 .next_columns = { 246 RS_COLUMN_SISO_ANT_B, 247 RS_COLUMN_MIMO2, 248 RS_COLUMN_SISO_ANT_A_SGI, 249 RS_COLUMN_LEGACY_ANT_A, 250 RS_COLUMN_LEGACY_ANT_B, 251 RS_COLUMN_INVALID, 252 RS_COLUMN_INVALID, 253 }, 254 .checks = { 255 rs_siso_allow, 256 rs_ant_allow, 257 }, 258 }, 259 [RS_COLUMN_SISO_ANT_B] = { 260 .mode = RS_SISO, 261 .ant = ANT_B, 262 .next_columns = { 263 RS_COLUMN_SISO_ANT_A, 264 RS_COLUMN_MIMO2, 265 RS_COLUMN_SISO_ANT_B_SGI, 266 RS_COLUMN_LEGACY_ANT_A, 267 RS_COLUMN_LEGACY_ANT_B, 268 RS_COLUMN_INVALID, 269 RS_COLUMN_INVALID, 270 }, 271 .checks = { 272 rs_siso_allow, 273 rs_ant_allow, 274 }, 275 }, 276 [RS_COLUMN_SISO_ANT_A_SGI] = { 277 .mode = RS_SISO, 278 .ant = ANT_A, 279 .sgi = true, 280 .next_columns = { 281 RS_COLUMN_SISO_ANT_B_SGI, 282 RS_COLUMN_MIMO2_SGI, 283 RS_COLUMN_SISO_ANT_A, 284 RS_COLUMN_LEGACY_ANT_A, 285 RS_COLUMN_LEGACY_ANT_B, 286 RS_COLUMN_INVALID, 287 RS_COLUMN_INVALID, 288 }, 289 .checks = { 290 rs_siso_allow, 291 rs_ant_allow, 292 rs_sgi_allow, 293 }, 294 }, 295 [RS_COLUMN_SISO_ANT_B_SGI] = { 296 .mode = RS_SISO, 297 .ant = ANT_B, 298 .sgi = true, 299 .next_columns = { 300 RS_COLUMN_SISO_ANT_A_SGI, 301 RS_COLUMN_MIMO2_SGI, 302 RS_COLUMN_SISO_ANT_B, 303 RS_COLUMN_LEGACY_ANT_A, 304 RS_COLUMN_LEGACY_ANT_B, 305 RS_COLUMN_INVALID, 306 RS_COLUMN_INVALID, 307 }, 308 .checks = { 309 rs_siso_allow, 310 rs_ant_allow, 311 rs_sgi_allow, 312 }, 313 }, 314 [RS_COLUMN_MIMO2] = { 315 .mode = RS_MIMO2, 316 .ant = ANT_AB, 317 .next_columns = { 318 RS_COLUMN_SISO_ANT_A, 319 RS_COLUMN_MIMO2_SGI, 320 RS_COLUMN_LEGACY_ANT_A, 321 RS_COLUMN_LEGACY_ANT_B, 322 RS_COLUMN_INVALID, 323 RS_COLUMN_INVALID, 324 RS_COLUMN_INVALID, 325 }, 326 .checks = { 327 rs_mimo_allow, 328 }, 329 }, 330 [RS_COLUMN_MIMO2_SGI] = { 331 .mode = RS_MIMO2, 332 .ant = ANT_AB, 333 .sgi = true, 334 .next_columns = { 335 RS_COLUMN_SISO_ANT_A_SGI, 336 RS_COLUMN_MIMO2, 337 RS_COLUMN_LEGACY_ANT_A, 338 RS_COLUMN_LEGACY_ANT_B, 339 RS_COLUMN_INVALID, 340 RS_COLUMN_INVALID, 341 RS_COLUMN_INVALID, 342 }, 343 .checks = { 344 rs_mimo_allow, 345 rs_sgi_allow, 346 }, 347 }, 348 }; 349 350 static inline u8 rs_extract_rate(u32 rate_n_flags) 351 { 352 /* also works for HT because bits 7:6 are zero there */ 353 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 354 } 355 356 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 357 { 358 int idx = 0; 359 360 if (rate_n_flags & RATE_MCS_HT_MSK) { 361 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 362 idx += IWL_RATE_MCS_0_INDEX; 363 364 /* skip 9M not supported in HT*/ 365 if (idx >= IWL_RATE_9M_INDEX) 366 idx += 1; 367 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 368 return idx; 369 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 370 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 371 idx += IWL_RATE_MCS_0_INDEX; 372 373 /* skip 9M not supported in VHT*/ 374 if (idx >= IWL_RATE_9M_INDEX) 375 idx++; 376 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 377 return idx; 378 } else { 379 /* legacy rate format, search for match in table */ 380 381 u8 legacy_rate = rs_extract_rate(rate_n_flags); 382 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 383 if (iwl_rates[idx].plcp == legacy_rate) 384 return idx; 385 } 386 387 return IWL_RATE_INVALID; 388 } 389 390 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 391 struct ieee80211_sta *sta, 392 struct iwl_lq_sta *lq_sta, 393 int tid, bool ndp); 394 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 395 struct ieee80211_sta *sta, 396 struct iwl_lq_sta *lq_sta, 397 const struct rs_rate *initial_rate); 398 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 399 400 /** 401 * The following tables contain the expected throughput metrics for all rates 402 * 403 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 404 * 405 * where invalid entries are zeros. 406 * 407 * CCK rates are only valid in legacy table and will only be used in G 408 * (2.4 GHz) band. 409 */ 410 411 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 412 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 413 }; 414 415 /* Expected TpT tables. 4 indexes: 416 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 417 */ 418 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 419 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 420 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 421 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 422 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 423 }; 424 425 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 426 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 427 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 428 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 429 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 430 }; 431 432 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 433 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 434 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 435 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 436 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 437 }; 438 439 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 440 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 441 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 442 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 443 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 444 }; 445 446 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 447 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 448 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 449 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 450 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 451 }; 452 453 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 454 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 455 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 456 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 457 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 458 }; 459 460 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 461 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 462 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 463 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 464 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 465 }; 466 467 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 468 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 469 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 470 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 471 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 472 }; 473 474 /* mbps, mcs */ 475 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 476 { "1", "BPSK DSSS"}, 477 { "2", "QPSK DSSS"}, 478 {"5.5", "BPSK CCK"}, 479 { "11", "QPSK CCK"}, 480 { "6", "BPSK 1/2"}, 481 { "9", "BPSK 1/2"}, 482 { "12", "QPSK 1/2"}, 483 { "18", "QPSK 3/4"}, 484 { "24", "16QAM 1/2"}, 485 { "36", "16QAM 3/4"}, 486 { "48", "64QAM 2/3"}, 487 { "54", "64QAM 3/4"}, 488 { "60", "64QAM 5/6"}, 489 }; 490 491 #define MCS_INDEX_PER_STREAM (8) 492 493 static const char *rs_pretty_ant(u8 ant) 494 { 495 static const char * const ant_name[] = { 496 [ANT_NONE] = "None", 497 [ANT_A] = "A", 498 [ANT_B] = "B", 499 [ANT_AB] = "AB", 500 [ANT_C] = "C", 501 [ANT_AC] = "AC", 502 [ANT_BC] = "BC", 503 [ANT_ABC] = "ABC", 504 }; 505 506 if (ant > ANT_ABC) 507 return "UNKNOWN"; 508 509 return ant_name[ant]; 510 } 511 512 static const char *rs_pretty_lq_type(enum iwl_table_type type) 513 { 514 static const char * const lq_types[] = { 515 [LQ_NONE] = "NONE", 516 [LQ_LEGACY_A] = "LEGACY_A", 517 [LQ_LEGACY_G] = "LEGACY_G", 518 [LQ_HT_SISO] = "HT SISO", 519 [LQ_HT_MIMO2] = "HT MIMO", 520 [LQ_VHT_SISO] = "VHT SISO", 521 [LQ_VHT_MIMO2] = "VHT MIMO", 522 }; 523 524 if (type < LQ_NONE || type >= LQ_MAX) 525 return "UNKNOWN"; 526 527 return lq_types[type]; 528 } 529 530 static char *rs_pretty_rate(const struct rs_rate *rate) 531 { 532 static char buf[40]; 533 static const char * const legacy_rates[] = { 534 [IWL_RATE_1M_INDEX] = "1M", 535 [IWL_RATE_2M_INDEX] = "2M", 536 [IWL_RATE_5M_INDEX] = "5.5M", 537 [IWL_RATE_11M_INDEX] = "11M", 538 [IWL_RATE_6M_INDEX] = "6M", 539 [IWL_RATE_9M_INDEX] = "9M", 540 [IWL_RATE_12M_INDEX] = "12M", 541 [IWL_RATE_18M_INDEX] = "18M", 542 [IWL_RATE_24M_INDEX] = "24M", 543 [IWL_RATE_36M_INDEX] = "36M", 544 [IWL_RATE_48M_INDEX] = "48M", 545 [IWL_RATE_54M_INDEX] = "54M", 546 }; 547 static const char *const ht_vht_rates[] = { 548 [IWL_RATE_MCS_0_INDEX] = "MCS0", 549 [IWL_RATE_MCS_1_INDEX] = "MCS1", 550 [IWL_RATE_MCS_2_INDEX] = "MCS2", 551 [IWL_RATE_MCS_3_INDEX] = "MCS3", 552 [IWL_RATE_MCS_4_INDEX] = "MCS4", 553 [IWL_RATE_MCS_5_INDEX] = "MCS5", 554 [IWL_RATE_MCS_6_INDEX] = "MCS6", 555 [IWL_RATE_MCS_7_INDEX] = "MCS7", 556 [IWL_RATE_MCS_8_INDEX] = "MCS8", 557 [IWL_RATE_MCS_9_INDEX] = "MCS9", 558 }; 559 const char *rate_str; 560 561 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 562 rate_str = legacy_rates[rate->index]; 563 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 564 (rate->index >= IWL_RATE_MCS_0_INDEX) && 565 (rate->index <= IWL_RATE_MCS_9_INDEX)) 566 rate_str = ht_vht_rates[rate->index]; 567 else 568 rate_str = "BAD_RATE"; 569 570 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 571 rs_pretty_ant(rate->ant), rate_str); 572 return buf; 573 } 574 575 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 576 const char *prefix) 577 { 578 IWL_DEBUG_RATE(mvm, 579 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 580 prefix, rs_pretty_rate(rate), rate->bw, 581 rate->sgi, rate->ldpc, rate->stbc); 582 } 583 584 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 585 { 586 window->data = 0; 587 window->success_counter = 0; 588 window->success_ratio = IWL_INVALID_VALUE; 589 window->counter = 0; 590 window->average_tpt = IWL_INVALID_VALUE; 591 } 592 593 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 594 struct iwl_scale_tbl_info *tbl) 595 { 596 int i; 597 598 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 599 for (i = 0; i < IWL_RATE_COUNT; i++) 600 rs_rate_scale_clear_window(&tbl->win[i]); 601 602 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 603 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 604 } 605 606 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 607 { 608 return (ant_type & valid_antenna) == ant_type; 609 } 610 611 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 612 struct iwl_lq_sta *lq_data, u8 tid, 613 struct ieee80211_sta *sta) 614 { 615 int ret = -EAGAIN; 616 617 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 618 sta->addr, tid); 619 620 /* start BA session until the peer sends del BA */ 621 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 622 if (ret == -EAGAIN) { 623 /* 624 * driver and mac80211 is out of sync 625 * this might be cause by reloading firmware 626 * stop the tx ba session here 627 */ 628 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 629 tid); 630 ieee80211_stop_tx_ba_session(sta, tid); 631 } 632 return ret; 633 } 634 635 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 636 u8 tid, struct iwl_lq_sta *lq_sta, 637 struct ieee80211_sta *sta) 638 { 639 struct iwl_mvm_tid_data *tid_data; 640 641 /* 642 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 643 * when the frame is not QoS 644 */ 645 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 646 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 647 tid, IWL_MAX_TID_COUNT); 648 return; 649 } else if (tid == IWL_MAX_TID_COUNT) { 650 return; 651 } 652 653 tid_data = &mvmsta->tid_data[tid]; 654 if ((tid_data->state == IWL_AGG_OFF) && 655 (lq_sta->tx_agg_tid_en & BIT(tid)) && 656 (tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 657 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 658 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 659 tid_data->state = IWL_AGG_QUEUED; 660 } 661 } 662 663 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 664 { 665 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 666 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 667 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 668 } 669 670 /* 671 * Static function to get the expected throughput from an iwl_scale_tbl_info 672 * that wraps a NULL pointer check 673 */ 674 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 675 { 676 if (tbl->expected_tpt) 677 return tbl->expected_tpt[rs_index]; 678 return 0; 679 } 680 681 /** 682 * rs_collect_tx_data - Update the success/failure sliding window 683 * 684 * We keep a sliding window of the last 62 packets transmitted 685 * at this rate. window->data contains the bitmask of successful 686 * packets. 687 */ 688 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 689 struct iwl_scale_tbl_info *tbl, 690 int scale_index, int attempts, int successes, 691 struct iwl_rate_scale_data *window) 692 { 693 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 694 s32 fail_count, tpt; 695 696 /* Get expected throughput */ 697 tpt = get_expected_tpt(tbl, scale_index); 698 699 /* 700 * Keep track of only the latest 62 tx frame attempts in this rate's 701 * history window; anything older isn't really relevant any more. 702 * If we have filled up the sliding window, drop the oldest attempt; 703 * if the oldest attempt (highest bit in bitmap) shows "success", 704 * subtract "1" from the success counter (this is the main reason 705 * we keep these bitmaps!). 706 */ 707 while (attempts > 0) { 708 if (window->counter >= IWL_RATE_MAX_WINDOW) { 709 /* remove earliest */ 710 window->counter = IWL_RATE_MAX_WINDOW - 1; 711 712 if (window->data & mask) { 713 window->data &= ~mask; 714 window->success_counter--; 715 } 716 } 717 718 /* Increment frames-attempted counter */ 719 window->counter++; 720 721 /* Shift bitmap by one frame to throw away oldest history */ 722 window->data <<= 1; 723 724 /* Mark the most recent #successes attempts as successful */ 725 if (successes > 0) { 726 window->success_counter++; 727 window->data |= 0x1; 728 successes--; 729 } 730 731 attempts--; 732 } 733 734 /* Calculate current success ratio, avoid divide-by-0! */ 735 if (window->counter > 0) 736 window->success_ratio = 128 * (100 * window->success_counter) 737 / window->counter; 738 else 739 window->success_ratio = IWL_INVALID_VALUE; 740 741 fail_count = window->counter - window->success_counter; 742 743 /* Calculate average throughput, if we have enough history. */ 744 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 745 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 746 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 747 else 748 window->average_tpt = IWL_INVALID_VALUE; 749 750 return 0; 751 } 752 753 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 754 struct iwl_lq_sta *lq_sta, 755 struct iwl_scale_tbl_info *tbl, 756 int scale_index, int attempts, int successes, 757 u8 reduced_txp) 758 { 759 struct iwl_rate_scale_data *window = NULL; 760 761 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 762 return -EINVAL; 763 764 window = &tbl->tpc_win[reduced_txp]; 765 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 766 window); 767 } 768 769 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 770 struct iwl_mvm_sta *mvmsta, 771 u8 tid, int successes) 772 { 773 struct iwl_mvm_tid_data *tid_data; 774 775 if (tid >= IWL_MAX_TID_COUNT) 776 return; 777 778 tid_data = &mvmsta->tid_data[tid]; 779 780 /* 781 * Measure if there're enough successful transmits per second. 782 * These statistics are used only to decide if we can start a 783 * BA session, so it should be updated only when A-MPDU is 784 * off. 785 */ 786 if (tid_data->state != IWL_AGG_OFF) 787 return; 788 789 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 790 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 791 tid_data->tx_count_last = tid_data->tx_count; 792 tid_data->tx_count = 0; 793 tid_data->tpt_meas_start = jiffies; 794 } else { 795 tid_data->tx_count += successes; 796 } 797 } 798 799 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 800 struct iwl_mvm_sta *mvmsta, u8 tid, 801 struct iwl_scale_tbl_info *tbl, 802 int scale_index, int attempts, int successes) 803 { 804 struct iwl_rate_scale_data *window = NULL; 805 806 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 807 return -EINVAL; 808 809 if (tbl->column != RS_COLUMN_INVALID) { 810 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 811 812 pers->tx_stats[tbl->column][scale_index].total += attempts; 813 pers->tx_stats[tbl->column][scale_index].success += successes; 814 } 815 816 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 817 818 /* Select window for current tx bit rate */ 819 window = &(tbl->win[scale_index]); 820 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 821 window); 822 } 823 824 /* Convert rs_rate object into ucode rate bitmask */ 825 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 826 struct rs_rate *rate) 827 { 828 u32 ucode_rate = 0; 829 int index = rate->index; 830 831 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 832 RATE_MCS_ANT_ABC_MSK); 833 834 if (is_legacy(rate)) { 835 ucode_rate |= iwl_rates[index].plcp; 836 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 837 ucode_rate |= RATE_MCS_CCK_MSK; 838 return ucode_rate; 839 } 840 841 if (is_ht(rate)) { 842 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 843 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 844 index = IWL_LAST_HT_RATE; 845 } 846 ucode_rate |= RATE_MCS_HT_MSK; 847 848 if (is_ht_siso(rate)) 849 ucode_rate |= iwl_rates[index].plcp_ht_siso; 850 else if (is_ht_mimo2(rate)) 851 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 852 else 853 WARN_ON_ONCE(1); 854 } else if (is_vht(rate)) { 855 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 856 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 857 index = IWL_LAST_VHT_RATE; 858 } 859 ucode_rate |= RATE_MCS_VHT_MSK; 860 if (is_vht_siso(rate)) 861 ucode_rate |= iwl_rates[index].plcp_vht_siso; 862 else if (is_vht_mimo2(rate)) 863 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 864 else 865 WARN_ON_ONCE(1); 866 867 } else { 868 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 869 } 870 871 if (is_siso(rate) && rate->stbc) { 872 /* To enable STBC we need to set both a flag and ANT_AB */ 873 ucode_rate |= RATE_MCS_ANT_AB_MSK; 874 ucode_rate |= RATE_MCS_STBC_MSK; 875 } 876 877 ucode_rate |= rate->bw; 878 if (rate->sgi) 879 ucode_rate |= RATE_MCS_SGI_MSK; 880 if (rate->ldpc) 881 ucode_rate |= RATE_MCS_LDPC_MSK; 882 883 return ucode_rate; 884 } 885 886 /* Convert a ucode rate into an rs_rate object */ 887 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 888 enum nl80211_band band, 889 struct rs_rate *rate) 890 { 891 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 892 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 893 u8 nss; 894 895 memset(rate, 0, sizeof(*rate)); 896 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 897 898 if (rate->index == IWL_RATE_INVALID) 899 return -EINVAL; 900 901 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 902 903 /* Legacy */ 904 if (!(ucode_rate & RATE_MCS_HT_MSK) && 905 !(ucode_rate & RATE_MCS_VHT_MSK)) { 906 if (num_of_ant == 1) { 907 if (band == NL80211_BAND_5GHZ) 908 rate->type = LQ_LEGACY_A; 909 else 910 rate->type = LQ_LEGACY_G; 911 } 912 913 return 0; 914 } 915 916 /* HT or VHT */ 917 if (ucode_rate & RATE_MCS_SGI_MSK) 918 rate->sgi = true; 919 if (ucode_rate & RATE_MCS_LDPC_MSK) 920 rate->ldpc = true; 921 if (ucode_rate & RATE_MCS_STBC_MSK) 922 rate->stbc = true; 923 if (ucode_rate & RATE_MCS_BF_MSK) 924 rate->bfer = true; 925 926 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 927 928 if (ucode_rate & RATE_MCS_HT_MSK) { 929 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 930 RATE_HT_MCS_NSS_POS) + 1; 931 932 if (nss == 1) { 933 rate->type = LQ_HT_SISO; 934 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 935 "stbc %d bfer %d", 936 rate->stbc, rate->bfer); 937 } else if (nss == 2) { 938 rate->type = LQ_HT_MIMO2; 939 WARN_ON_ONCE(num_of_ant != 2); 940 } else { 941 WARN_ON_ONCE(1); 942 } 943 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 944 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 945 RATE_VHT_MCS_NSS_POS) + 1; 946 947 if (nss == 1) { 948 rate->type = LQ_VHT_SISO; 949 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 950 "stbc %d bfer %d", 951 rate->stbc, rate->bfer); 952 } else if (nss == 2) { 953 rate->type = LQ_VHT_MIMO2; 954 WARN_ON_ONCE(num_of_ant != 2); 955 } else { 956 WARN_ON_ONCE(1); 957 } 958 } 959 960 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 961 !is_vht(rate)); 962 963 return 0; 964 } 965 966 /* switch to another antenna/antennas and return 1 */ 967 /* if no other valid antenna found, return 0 */ 968 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 969 { 970 u8 new_ant_type; 971 972 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 973 return 0; 974 975 if (!rs_is_valid_ant(valid_ant, rate->ant)) 976 return 0; 977 978 new_ant_type = ant_toggle_lookup[rate->ant]; 979 980 while ((new_ant_type != rate->ant) && 981 !rs_is_valid_ant(valid_ant, new_ant_type)) 982 new_ant_type = ant_toggle_lookup[new_ant_type]; 983 984 if (new_ant_type == rate->ant) 985 return 0; 986 987 rate->ant = new_ant_type; 988 989 return 1; 990 } 991 992 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 993 struct rs_rate *rate) 994 { 995 if (is_legacy(rate)) 996 return lq_sta->active_legacy_rate; 997 else if (is_siso(rate)) 998 return lq_sta->active_siso_rate; 999 else if (is_mimo2(rate)) 1000 return lq_sta->active_mimo2_rate; 1001 1002 WARN_ON_ONCE(1); 1003 return 0; 1004 } 1005 1006 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1007 int rate_type) 1008 { 1009 u8 high = IWL_RATE_INVALID; 1010 u8 low = IWL_RATE_INVALID; 1011 1012 /* 802.11A or ht walks to the next literal adjacent rate in 1013 * the rate table */ 1014 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1015 int i; 1016 u32 mask; 1017 1018 /* Find the previous rate that is in the rate mask */ 1019 i = index - 1; 1020 if (i >= 0) 1021 mask = BIT(i); 1022 for (; i >= 0; i--, mask >>= 1) { 1023 if (rate_mask & mask) { 1024 low = i; 1025 break; 1026 } 1027 } 1028 1029 /* Find the next rate that is in the rate mask */ 1030 i = index + 1; 1031 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1032 if (rate_mask & mask) { 1033 high = i; 1034 break; 1035 } 1036 } 1037 1038 return (high << 8) | low; 1039 } 1040 1041 low = index; 1042 while (low != IWL_RATE_INVALID) { 1043 low = iwl_rates[low].prev_rs; 1044 if (low == IWL_RATE_INVALID) 1045 break; 1046 if (rate_mask & (1 << low)) 1047 break; 1048 } 1049 1050 high = index; 1051 while (high != IWL_RATE_INVALID) { 1052 high = iwl_rates[high].next_rs; 1053 if (high == IWL_RATE_INVALID) 1054 break; 1055 if (rate_mask & (1 << high)) 1056 break; 1057 } 1058 1059 return (high << 8) | low; 1060 } 1061 1062 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1063 struct rs_rate *rate) 1064 { 1065 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1066 } 1067 1068 /* Get the next supported lower rate in the current column. 1069 * Return true if bottom rate in the current column was reached 1070 */ 1071 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1072 struct rs_rate *rate) 1073 { 1074 u8 low; 1075 u16 high_low; 1076 u16 rate_mask; 1077 struct iwl_mvm *mvm = lq_sta->pers.drv; 1078 1079 rate_mask = rs_get_supported_rates(lq_sta, rate); 1080 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1081 rate->type); 1082 low = high_low & 0xff; 1083 1084 /* Bottom rate of column reached */ 1085 if (low == IWL_RATE_INVALID) 1086 return true; 1087 1088 rate->index = low; 1089 return false; 1090 } 1091 1092 /* Get the next rate to use following a column downgrade */ 1093 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1094 struct rs_rate *rate) 1095 { 1096 struct iwl_mvm *mvm = lq_sta->pers.drv; 1097 1098 if (is_legacy(rate)) { 1099 /* No column to downgrade from Legacy */ 1100 return; 1101 } else if (is_siso(rate)) { 1102 /* Downgrade to Legacy if we were in SISO */ 1103 if (lq_sta->band == NL80211_BAND_5GHZ) 1104 rate->type = LQ_LEGACY_A; 1105 else 1106 rate->type = LQ_LEGACY_G; 1107 1108 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1109 1110 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1111 rate->index > IWL_RATE_MCS_9_INDEX); 1112 1113 rate->index = rs_ht_to_legacy[rate->index]; 1114 rate->ldpc = false; 1115 } else { 1116 /* Downgrade to SISO with same MCS if in MIMO */ 1117 rate->type = is_vht_mimo2(rate) ? 1118 LQ_VHT_SISO : LQ_HT_SISO; 1119 } 1120 1121 if (num_of_ant(rate->ant) > 1) 1122 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1123 1124 /* Relevant in both switching to SISO or Legacy */ 1125 rate->sgi = false; 1126 1127 if (!rs_rate_supported(lq_sta, rate)) 1128 rs_get_lower_rate_in_column(lq_sta, rate); 1129 } 1130 1131 /* Check if both rates share the same column */ 1132 static inline bool rs_rate_column_match(struct rs_rate *a, 1133 struct rs_rate *b) 1134 { 1135 bool ant_match; 1136 1137 if (a->stbc || a->bfer) 1138 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1139 else 1140 ant_match = (a->ant == b->ant); 1141 1142 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1143 && ant_match; 1144 } 1145 1146 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1147 { 1148 if (is_legacy(rate)) { 1149 if (rate->ant == ANT_A) 1150 return RS_COLUMN_LEGACY_ANT_A; 1151 1152 if (rate->ant == ANT_B) 1153 return RS_COLUMN_LEGACY_ANT_B; 1154 1155 goto err; 1156 } 1157 1158 if (is_siso(rate)) { 1159 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1160 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1161 RS_COLUMN_SISO_ANT_A; 1162 1163 if (rate->ant == ANT_B) 1164 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1165 RS_COLUMN_SISO_ANT_B; 1166 1167 goto err; 1168 } 1169 1170 if (is_mimo(rate)) 1171 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1172 1173 err: 1174 return RS_COLUMN_INVALID; 1175 } 1176 1177 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1178 { 1179 u8 tid = IWL_MAX_TID_COUNT; 1180 1181 if (ieee80211_is_data_qos(hdr->frame_control)) { 1182 u8 *qc = ieee80211_get_qos_ctl(hdr); 1183 tid = qc[0] & 0xf; 1184 } 1185 1186 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1187 tid = IWL_MAX_TID_COUNT; 1188 1189 return tid; 1190 } 1191 1192 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1193 int tid, struct ieee80211_tx_info *info, bool ndp) 1194 { 1195 int legacy_success; 1196 int retries; 1197 int i; 1198 struct iwl_lq_cmd *table; 1199 u32 lq_hwrate; 1200 struct rs_rate lq_rate, tx_resp_rate; 1201 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 1202 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 1203 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 1204 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 1205 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 1206 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1207 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 1208 1209 /* Treat uninitialized rate scaling data same as non-existing. */ 1210 if (!lq_sta) { 1211 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n"); 1212 return; 1213 } else if (!lq_sta->pers.drv) { 1214 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 1215 return; 1216 } 1217 1218 /* This packet was aggregated but doesn't carry status info */ 1219 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 1220 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 1221 return; 1222 1223 rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, &tx_resp_rate); 1224 1225 #ifdef CONFIG_MAC80211_DEBUGFS 1226 /* Disable last tx check if we are debugging with fixed rate but 1227 * update tx stats */ 1228 if (lq_sta->pers.dbg_fixed_rate) { 1229 int index = tx_resp_rate.index; 1230 enum rs_column column; 1231 int attempts, success; 1232 1233 column = rs_get_column_from_rate(&tx_resp_rate); 1234 if (WARN_ONCE(column == RS_COLUMN_INVALID, 1235 "Can't map rate 0x%x to column", 1236 tx_resp_hwrate)) 1237 return; 1238 1239 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1240 attempts = info->status.ampdu_len; 1241 success = info->status.ampdu_ack_len; 1242 } else { 1243 attempts = info->status.rates[0].count; 1244 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1245 } 1246 1247 lq_sta->pers.tx_stats[column][index].total += attempts; 1248 lq_sta->pers.tx_stats[column][index].success += success; 1249 1250 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 1251 tx_resp_hwrate, success, attempts); 1252 return; 1253 } 1254 #endif 1255 1256 if (time_after(jiffies, 1257 (unsigned long)(lq_sta->last_tx + 1258 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 1259 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 1260 iwl_mvm_rs_rate_init(mvm, sta, info->band, false); 1261 return; 1262 } 1263 lq_sta->last_tx = jiffies; 1264 1265 /* Ignore this Tx frame response if its initial rate doesn't match 1266 * that of latest Link Quality command. There may be stragglers 1267 * from a previous Link Quality command, but we're no longer interested 1268 * in those; they're either from the "active" mode while we're trying 1269 * to check "search" mode, or a prior "search" mode after we've moved 1270 * to a new "search" mode (which might become the new "active" mode). 1271 */ 1272 table = &lq_sta->lq; 1273 lq_hwrate = le32_to_cpu(table->rs_table[0]); 1274 rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate); 1275 1276 /* Here we actually compare this rate to the latest LQ command */ 1277 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 1278 IWL_DEBUG_RATE(mvm, 1279 "tx resp color 0x%x does not match 0x%x\n", 1280 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 1281 1282 /* 1283 * Since rates mis-match, the last LQ command may have failed. 1284 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 1285 * ... driver. 1286 */ 1287 lq_sta->missed_rate_counter++; 1288 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 1289 lq_sta->missed_rate_counter = 0; 1290 IWL_DEBUG_RATE(mvm, 1291 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 1292 lq_sta->rs_state); 1293 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1294 } 1295 /* Regardless, ignore this status info for outdated rate */ 1296 return; 1297 } else 1298 /* Rate did match, so reset the missed_rate_counter */ 1299 lq_sta->missed_rate_counter = 0; 1300 1301 if (!lq_sta->search_better_tbl) { 1302 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1303 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1304 } else { 1305 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1306 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1307 } 1308 1309 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 1310 IWL_DEBUG_RATE(mvm, 1311 "Neither active nor search matches tx rate\n"); 1312 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1313 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 1314 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]); 1315 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 1316 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 1317 1318 /* 1319 * no matching table found, let's by-pass the data collection 1320 * and continue to perform rate scale to find the rate table 1321 */ 1322 rs_stay_in_table(lq_sta, true); 1323 goto done; 1324 } 1325 1326 /* 1327 * Updating the frame history depends on whether packets were 1328 * aggregated. 1329 * 1330 * For aggregation, all packets were transmitted at the same rate, the 1331 * first index into rate scale table. 1332 */ 1333 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 1334 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 1335 info->status.ampdu_len, 1336 info->status.ampdu_ack_len, 1337 reduced_txp); 1338 1339 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 1340 * it as a single frame loss as we don't want the success ratio 1341 * to dip too quickly because a BA wasn't received. 1342 * For TPC, there's no need for this optimisation since we want 1343 * to recover very quickly from a bad power reduction and, 1344 * therefore we'd like the success ratio to get an immediate hit 1345 * when failing to get a BA, so we'd switch back to a lower or 1346 * zero power reduction. When FW transmits agg with a rate 1347 * different from the initial rate, it will not use reduced txp 1348 * and will send BA notification twice (one empty with reduced 1349 * txp equal to the value from LQ and one with reduced txp 0). 1350 * We need to update counters for each txp level accordingly. 1351 */ 1352 if (info->status.ampdu_ack_len == 0) 1353 info->status.ampdu_len = 1; 1354 1355 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index, 1356 info->status.ampdu_len, 1357 info->status.ampdu_ack_len); 1358 1359 /* Update success/fail counts if not searching for new mode */ 1360 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1361 lq_sta->total_success += info->status.ampdu_ack_len; 1362 lq_sta->total_failed += (info->status.ampdu_len - 1363 info->status.ampdu_ack_len); 1364 } 1365 } else { 1366 /* For legacy, update frame history with for each Tx retry. */ 1367 retries = info->status.rates[0].count - 1; 1368 /* HW doesn't send more than 15 retries */ 1369 retries = min(retries, 15); 1370 1371 /* The last transmission may have been successful */ 1372 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 1373 /* Collect data for each rate used during failed TX attempts */ 1374 for (i = 0; i <= retries; ++i) { 1375 lq_hwrate = le32_to_cpu(table->rs_table[i]); 1376 rs_rate_from_ucode_rate(lq_hwrate, info->band, 1377 &lq_rate); 1378 /* 1379 * Only collect stats if retried rate is in the same RS 1380 * table as active/search. 1381 */ 1382 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 1383 tmp_tbl = curr_tbl; 1384 else if (rs_rate_column_match(&lq_rate, 1385 &other_tbl->rate)) 1386 tmp_tbl = other_tbl; 1387 else 1388 continue; 1389 1390 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 1391 tx_resp_rate.index, 1, 1392 i < retries ? 0 : legacy_success, 1393 reduced_txp); 1394 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 1395 tx_resp_rate.index, 1, 1396 i < retries ? 0 : legacy_success); 1397 } 1398 1399 /* Update success/fail counts if not searching for new mode */ 1400 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1401 lq_sta->total_success += legacy_success; 1402 lq_sta->total_failed += retries + (1 - legacy_success); 1403 } 1404 } 1405 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 1406 lq_sta->last_rate_n_flags = lq_hwrate; 1407 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 1408 done: 1409 /* See if there's a better rate or modulation mode to try. */ 1410 if (sta->supp_rates[info->band]) 1411 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 1412 } 1413 1414 /* 1415 * mac80211 sends us Tx status 1416 */ 1417 static void rs_drv_mac80211_tx_status(void *mvm_r, 1418 struct ieee80211_supported_band *sband, 1419 struct ieee80211_sta *sta, void *priv_sta, 1420 struct sk_buff *skb) 1421 { 1422 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1423 struct iwl_op_mode *op_mode = mvm_r; 1424 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1425 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1426 1427 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 1428 return; 1429 1430 if (!ieee80211_is_data(hdr->frame_control) || 1431 info->flags & IEEE80211_TX_CTL_NO_ACK) 1432 return; 1433 1434 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1435 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1436 } 1437 1438 /* 1439 * Begin a period of staying with a selected modulation mode. 1440 * Set "stay_in_tbl" flag to prevent any mode switches. 1441 * Set frame tx success limits according to legacy vs. high-throughput, 1442 * and reset overall (spanning all rates) tx success history statistics. 1443 * These control how long we stay using same modulation mode before 1444 * searching for a new mode. 1445 */ 1446 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1447 struct iwl_lq_sta *lq_sta) 1448 { 1449 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1450 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1451 if (is_legacy) { 1452 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1453 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1454 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1455 } else { 1456 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1457 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1458 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1459 } 1460 lq_sta->table_count = 0; 1461 lq_sta->total_failed = 0; 1462 lq_sta->total_success = 0; 1463 lq_sta->flush_timer = jiffies; 1464 lq_sta->visited_columns = 0; 1465 } 1466 1467 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1468 { 1469 if (rate_mask) 1470 return find_last_bit(&rate_mask, BITS_PER_LONG); 1471 return IWL_RATE_INVALID; 1472 } 1473 1474 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1475 const struct rs_tx_column *column) 1476 { 1477 switch (column->mode) { 1478 case RS_LEGACY: 1479 return lq_sta->max_legacy_rate_idx; 1480 case RS_SISO: 1481 return lq_sta->max_siso_rate_idx; 1482 case RS_MIMO2: 1483 return lq_sta->max_mimo2_rate_idx; 1484 default: 1485 WARN_ON_ONCE(1); 1486 } 1487 1488 return lq_sta->max_legacy_rate_idx; 1489 } 1490 1491 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1492 const struct rs_tx_column *column, 1493 u32 bw) 1494 { 1495 /* Used to choose among HT tables */ 1496 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1497 1498 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1499 column->mode != RS_SISO && 1500 column->mode != RS_MIMO2)) 1501 return expected_tpt_legacy; 1502 1503 /* Legacy rates have only one table */ 1504 if (column->mode == RS_LEGACY) 1505 return expected_tpt_legacy; 1506 1507 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1508 /* Choose among many HT tables depending on number of streams 1509 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1510 * status */ 1511 if (column->mode == RS_SISO) { 1512 switch (bw) { 1513 case RATE_MCS_CHAN_WIDTH_20: 1514 ht_tbl_pointer = expected_tpt_siso_20MHz; 1515 break; 1516 case RATE_MCS_CHAN_WIDTH_40: 1517 ht_tbl_pointer = expected_tpt_siso_40MHz; 1518 break; 1519 case RATE_MCS_CHAN_WIDTH_80: 1520 ht_tbl_pointer = expected_tpt_siso_80MHz; 1521 break; 1522 case RATE_MCS_CHAN_WIDTH_160: 1523 ht_tbl_pointer = expected_tpt_siso_160MHz; 1524 break; 1525 default: 1526 WARN_ON_ONCE(1); 1527 } 1528 } else if (column->mode == RS_MIMO2) { 1529 switch (bw) { 1530 case RATE_MCS_CHAN_WIDTH_20: 1531 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1532 break; 1533 case RATE_MCS_CHAN_WIDTH_40: 1534 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1535 break; 1536 case RATE_MCS_CHAN_WIDTH_80: 1537 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1538 break; 1539 case RATE_MCS_CHAN_WIDTH_160: 1540 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1541 break; 1542 default: 1543 WARN_ON_ONCE(1); 1544 } 1545 } else { 1546 WARN_ON_ONCE(1); 1547 } 1548 1549 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1550 return ht_tbl_pointer[0]; 1551 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1552 return ht_tbl_pointer[1]; 1553 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1554 return ht_tbl_pointer[2]; 1555 else /* AGG+SGI */ 1556 return ht_tbl_pointer[3]; 1557 } 1558 1559 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1560 struct iwl_scale_tbl_info *tbl) 1561 { 1562 struct rs_rate *rate = &tbl->rate; 1563 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1564 1565 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1566 } 1567 1568 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1569 struct iwl_lq_sta *lq_sta, 1570 struct iwl_scale_tbl_info *tbl, /* "search" */ 1571 unsigned long rate_mask, s8 index) 1572 { 1573 struct iwl_scale_tbl_info *active_tbl = 1574 &(lq_sta->lq_info[lq_sta->active_tbl]); 1575 s32 success_ratio = active_tbl->win[index].success_ratio; 1576 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1577 const u16 *tpt_tbl = tbl->expected_tpt; 1578 u16 high_low; 1579 u32 target_tpt; 1580 int rate_idx; 1581 1582 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1583 target_tpt = 100 * expected_current_tpt; 1584 IWL_DEBUG_RATE(mvm, 1585 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1586 success_ratio, target_tpt); 1587 } else { 1588 target_tpt = lq_sta->last_tpt; 1589 IWL_DEBUG_RATE(mvm, 1590 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1591 success_ratio, target_tpt); 1592 } 1593 1594 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1595 1596 while (rate_idx != IWL_RATE_INVALID) { 1597 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1598 break; 1599 1600 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1601 tbl->rate.type); 1602 1603 rate_idx = (high_low >> 8) & 0xff; 1604 } 1605 1606 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1607 rate_idx, target_tpt, 1608 rate_idx != IWL_RATE_INVALID ? 1609 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1610 1611 return rate_idx; 1612 } 1613 1614 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1615 { 1616 switch (sta->bandwidth) { 1617 case IEEE80211_STA_RX_BW_160: 1618 return RATE_MCS_CHAN_WIDTH_160; 1619 case IEEE80211_STA_RX_BW_80: 1620 return RATE_MCS_CHAN_WIDTH_80; 1621 case IEEE80211_STA_RX_BW_40: 1622 return RATE_MCS_CHAN_WIDTH_40; 1623 case IEEE80211_STA_RX_BW_20: 1624 default: 1625 return RATE_MCS_CHAN_WIDTH_20; 1626 } 1627 } 1628 1629 /* 1630 * Check whether we should continue using same modulation mode, or 1631 * begin search for a new mode, based on: 1632 * 1) # tx successes or failures while using this mode 1633 * 2) # times calling this function 1634 * 3) elapsed time in this mode (not used, for now) 1635 */ 1636 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1637 { 1638 struct iwl_scale_tbl_info *tbl; 1639 int active_tbl; 1640 int flush_interval_passed = 0; 1641 struct iwl_mvm *mvm; 1642 1643 mvm = lq_sta->pers.drv; 1644 active_tbl = lq_sta->active_tbl; 1645 1646 tbl = &(lq_sta->lq_info[active_tbl]); 1647 1648 /* If we've been disallowing search, see if we should now allow it */ 1649 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1650 /* Elapsed time using current modulation mode */ 1651 if (lq_sta->flush_timer) 1652 flush_interval_passed = 1653 time_after(jiffies, 1654 (unsigned long)(lq_sta->flush_timer + 1655 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1656 1657 /* 1658 * Check if we should allow search for new modulation mode. 1659 * If many frames have failed or succeeded, or we've used 1660 * this same modulation for a long time, allow search, and 1661 * reset history stats that keep track of whether we should 1662 * allow a new search. Also (below) reset all bitmaps and 1663 * stats in active history. 1664 */ 1665 if (force_search || 1666 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1667 (lq_sta->total_success > lq_sta->max_success_limit) || 1668 ((!lq_sta->search_better_tbl) && 1669 (lq_sta->flush_timer) && (flush_interval_passed))) { 1670 IWL_DEBUG_RATE(mvm, 1671 "LQ: stay is expired %d %d %d\n", 1672 lq_sta->total_failed, 1673 lq_sta->total_success, 1674 flush_interval_passed); 1675 1676 /* Allow search for new mode */ 1677 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1678 IWL_DEBUG_RATE(mvm, 1679 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1680 lq_sta->total_failed = 0; 1681 lq_sta->total_success = 0; 1682 lq_sta->flush_timer = 0; 1683 /* mark the current column as visited */ 1684 lq_sta->visited_columns = BIT(tbl->column); 1685 /* 1686 * Else if we've used this modulation mode enough repetitions 1687 * (regardless of elapsed time or success/failure), reset 1688 * history bitmaps and rate-specific stats for all rates in 1689 * active table. 1690 */ 1691 } else { 1692 lq_sta->table_count++; 1693 if (lq_sta->table_count >= 1694 lq_sta->table_count_limit) { 1695 lq_sta->table_count = 0; 1696 1697 IWL_DEBUG_RATE(mvm, 1698 "LQ: stay in table clear win\n"); 1699 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1700 } 1701 } 1702 1703 /* If transitioning to allow "search", reset all history 1704 * bitmaps and stats in active table (this will become the new 1705 * "search" table). */ 1706 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1707 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1708 } 1709 } 1710 } 1711 1712 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1713 struct iwl_scale_tbl_info *tbl, 1714 enum rs_action scale_action) 1715 { 1716 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1717 1718 /* 1719 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1720 * or 0, since there is no per-TID alg. 1721 */ 1722 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1723 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1724 scale_action == RS_ACTION_DOWNSCALE) 1725 mvmsta->amsdu_enabled = 0; 1726 else 1727 mvmsta->amsdu_enabled = 0xFFFF; 1728 1729 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1730 } 1731 1732 /* 1733 * setup rate table in uCode 1734 */ 1735 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1736 struct ieee80211_sta *sta, 1737 struct iwl_lq_sta *lq_sta, 1738 struct iwl_scale_tbl_info *tbl) 1739 { 1740 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1741 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false); 1742 } 1743 1744 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1745 struct ieee80211_sta *sta, 1746 struct iwl_lq_sta *lq_sta, 1747 struct iwl_scale_tbl_info *tbl, 1748 enum rs_action scale_action) 1749 { 1750 if (sta->bandwidth != IEEE80211_STA_RX_BW_80) 1751 return false; 1752 1753 if (!is_vht_siso(&tbl->rate)) 1754 return false; 1755 1756 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1757 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1758 (scale_action == RS_ACTION_DOWNSCALE)) { 1759 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1760 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1761 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1762 goto tweaked; 1763 } 1764 1765 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1766 * sustainable, i.e. we're past the test window. We can't go back 1767 * if MCS5 is just tested as this will happen always after switching 1768 * to 20Mhz MCS4 because the rate stats are cleared. 1769 */ 1770 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1771 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1772 (scale_action == RS_ACTION_STAY)) || 1773 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1774 (scale_action == RS_ACTION_UPSCALE)))) { 1775 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1776 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1777 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1778 goto tweaked; 1779 } 1780 1781 return false; 1782 1783 tweaked: 1784 rs_set_expected_tpt_table(lq_sta, tbl); 1785 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1786 return true; 1787 } 1788 1789 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1790 struct iwl_lq_sta *lq_sta, 1791 struct ieee80211_sta *sta, 1792 struct iwl_scale_tbl_info *tbl) 1793 { 1794 int i, j, max_rate; 1795 enum rs_column next_col_id; 1796 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1797 const struct rs_tx_column *next_col; 1798 allow_column_func_t allow_func; 1799 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1800 const u16 *expected_tpt_tbl; 1801 u16 tpt, max_expected_tpt; 1802 1803 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1804 next_col_id = curr_col->next_columns[i]; 1805 1806 if (next_col_id == RS_COLUMN_INVALID) 1807 continue; 1808 1809 if (lq_sta->visited_columns & BIT(next_col_id)) { 1810 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1811 next_col_id); 1812 continue; 1813 } 1814 1815 next_col = &rs_tx_columns[next_col_id]; 1816 1817 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1818 IWL_DEBUG_RATE(mvm, 1819 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1820 next_col_id, valid_ants, next_col->ant); 1821 continue; 1822 } 1823 1824 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1825 allow_func = next_col->checks[j]; 1826 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1827 next_col)) 1828 break; 1829 } 1830 1831 if (j != MAX_COLUMN_CHECKS) { 1832 IWL_DEBUG_RATE(mvm, 1833 "Skip column %d: not allowed (check %d failed)\n", 1834 next_col_id, j); 1835 1836 continue; 1837 } 1838 1839 tpt = lq_sta->last_tpt / 100; 1840 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1841 rs_bw_from_sta_bw(sta)); 1842 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1843 continue; 1844 1845 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1846 if (max_rate == IWL_RATE_INVALID) { 1847 IWL_DEBUG_RATE(mvm, 1848 "Skip column %d: no rate is allowed in this column\n", 1849 next_col_id); 1850 continue; 1851 } 1852 1853 max_expected_tpt = expected_tpt_tbl[max_rate]; 1854 if (tpt >= max_expected_tpt) { 1855 IWL_DEBUG_RATE(mvm, 1856 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1857 next_col_id, max_expected_tpt, tpt); 1858 continue; 1859 } 1860 1861 IWL_DEBUG_RATE(mvm, 1862 "Found potential column %d. Max expected %d current %d\n", 1863 next_col_id, max_expected_tpt, tpt); 1864 break; 1865 } 1866 1867 if (i == MAX_NEXT_COLUMNS) 1868 return RS_COLUMN_INVALID; 1869 1870 return next_col_id; 1871 } 1872 1873 static int rs_switch_to_column(struct iwl_mvm *mvm, 1874 struct iwl_lq_sta *lq_sta, 1875 struct ieee80211_sta *sta, 1876 enum rs_column col_id) 1877 { 1878 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 1879 struct iwl_scale_tbl_info *search_tbl = 1880 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 1881 struct rs_rate *rate = &search_tbl->rate; 1882 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1883 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1884 unsigned long rate_mask = 0; 1885 u32 rate_idx = 0; 1886 1887 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1888 1889 rate->sgi = column->sgi; 1890 rate->ant = column->ant; 1891 1892 if (column->mode == RS_LEGACY) { 1893 if (lq_sta->band == NL80211_BAND_5GHZ) 1894 rate->type = LQ_LEGACY_A; 1895 else 1896 rate->type = LQ_LEGACY_G; 1897 1898 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1899 rate->ldpc = false; 1900 rate_mask = lq_sta->active_legacy_rate; 1901 } else if (column->mode == RS_SISO) { 1902 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1903 rate_mask = lq_sta->active_siso_rate; 1904 } else if (column->mode == RS_MIMO2) { 1905 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1906 rate_mask = lq_sta->active_mimo2_rate; 1907 } else { 1908 WARN_ONCE(1, "Bad column mode"); 1909 } 1910 1911 if (column->mode != RS_LEGACY) { 1912 rate->bw = rs_bw_from_sta_bw(sta); 1913 rate->ldpc = lq_sta->ldpc; 1914 } 1915 1916 search_tbl->column = col_id; 1917 rs_set_expected_tpt_table(lq_sta, search_tbl); 1918 1919 lq_sta->visited_columns |= BIT(col_id); 1920 1921 /* Get the best matching rate if we're changing modes. e.g. 1922 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1923 */ 1924 if (curr_column->mode != column->mode) { 1925 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1926 rate_mask, rate->index); 1927 1928 if ((rate_idx == IWL_RATE_INVALID) || 1929 !(BIT(rate_idx) & rate_mask)) { 1930 IWL_DEBUG_RATE(mvm, 1931 "can not switch with index %d" 1932 " rate mask %lx\n", 1933 rate_idx, rate_mask); 1934 1935 goto err; 1936 } 1937 1938 rate->index = rate_idx; 1939 } 1940 1941 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1942 col_id, rate->index); 1943 1944 return 0; 1945 1946 err: 1947 rate->type = LQ_NONE; 1948 return -1; 1949 } 1950 1951 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1952 struct iwl_scale_tbl_info *tbl, 1953 s32 sr, int low, int high, 1954 int current_tpt, 1955 int low_tpt, int high_tpt) 1956 { 1957 enum rs_action action = RS_ACTION_STAY; 1958 1959 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1960 (current_tpt == 0)) { 1961 IWL_DEBUG_RATE(mvm, 1962 "Decrease rate because of low SR\n"); 1963 return RS_ACTION_DOWNSCALE; 1964 } 1965 1966 if ((low_tpt == IWL_INVALID_VALUE) && 1967 (high_tpt == IWL_INVALID_VALUE) && 1968 (high != IWL_RATE_INVALID)) { 1969 IWL_DEBUG_RATE(mvm, 1970 "No data about high/low rates. Increase rate\n"); 1971 return RS_ACTION_UPSCALE; 1972 } 1973 1974 if ((high_tpt == IWL_INVALID_VALUE) && 1975 (high != IWL_RATE_INVALID) && 1976 (low_tpt != IWL_INVALID_VALUE) && 1977 (low_tpt < current_tpt)) { 1978 IWL_DEBUG_RATE(mvm, 1979 "No data about high rate and low rate is worse. Increase rate\n"); 1980 return RS_ACTION_UPSCALE; 1981 } 1982 1983 if ((high_tpt != IWL_INVALID_VALUE) && 1984 (high_tpt > current_tpt)) { 1985 IWL_DEBUG_RATE(mvm, 1986 "Higher rate is better. Increate rate\n"); 1987 return RS_ACTION_UPSCALE; 1988 } 1989 1990 if ((low_tpt != IWL_INVALID_VALUE) && 1991 (high_tpt != IWL_INVALID_VALUE) && 1992 (low_tpt < current_tpt) && 1993 (high_tpt < current_tpt)) { 1994 IWL_DEBUG_RATE(mvm, 1995 "Both high and low are worse. Maintain rate\n"); 1996 return RS_ACTION_STAY; 1997 } 1998 1999 if ((low_tpt != IWL_INVALID_VALUE) && 2000 (low_tpt > current_tpt)) { 2001 IWL_DEBUG_RATE(mvm, 2002 "Lower rate is better\n"); 2003 action = RS_ACTION_DOWNSCALE; 2004 goto out; 2005 } 2006 2007 if ((low_tpt == IWL_INVALID_VALUE) && 2008 (low != IWL_RATE_INVALID)) { 2009 IWL_DEBUG_RATE(mvm, 2010 "No data about lower rate\n"); 2011 action = RS_ACTION_DOWNSCALE; 2012 goto out; 2013 } 2014 2015 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 2016 2017 out: 2018 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 2019 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 2020 IWL_DEBUG_RATE(mvm, 2021 "SR is above NO DECREASE. Avoid downscale\n"); 2022 action = RS_ACTION_STAY; 2023 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 2024 IWL_DEBUG_RATE(mvm, 2025 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 2026 action = RS_ACTION_STAY; 2027 } else { 2028 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 2029 } 2030 } 2031 2032 return action; 2033 } 2034 2035 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2036 struct iwl_lq_sta *lq_sta) 2037 { 2038 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 2039 * supports STBC of at least 1*SS 2040 */ 2041 if (!lq_sta->stbc_capable) 2042 return false; 2043 2044 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 2045 return false; 2046 2047 return true; 2048 } 2049 2050 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 2051 int *weaker, int *stronger) 2052 { 2053 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 2054 if (*weaker > TPC_MAX_REDUCTION) 2055 *weaker = TPC_INVALID; 2056 2057 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 2058 if (*stronger < 0) 2059 *stronger = TPC_INVALID; 2060 } 2061 2062 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 2063 struct rs_rate *rate, enum nl80211_band band) 2064 { 2065 int index = rate->index; 2066 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 2067 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 2068 !vif->bss_conf.ps); 2069 2070 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 2071 cam, sta_ps_disabled); 2072 /* 2073 * allow tpc only if power management is enabled, or bt coex 2074 * activity grade allows it and we are on 2.4Ghz. 2075 */ 2076 if ((cam || sta_ps_disabled) && 2077 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 2078 return false; 2079 2080 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 2081 if (is_legacy(rate)) 2082 return index == IWL_RATE_54M_INDEX; 2083 if (is_ht(rate)) 2084 return index == IWL_RATE_MCS_7_INDEX; 2085 if (is_vht(rate)) 2086 return index == IWL_RATE_MCS_7_INDEX || 2087 index == IWL_RATE_MCS_8_INDEX || 2088 index == IWL_RATE_MCS_9_INDEX; 2089 2090 WARN_ON_ONCE(1); 2091 return false; 2092 } 2093 2094 enum tpc_action { 2095 TPC_ACTION_STAY, 2096 TPC_ACTION_DECREASE, 2097 TPC_ACTION_INCREASE, 2098 TPC_ACTION_NO_RESTIRCTION, 2099 }; 2100 2101 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 2102 s32 sr, int weak, int strong, 2103 int current_tpt, 2104 int weak_tpt, int strong_tpt) 2105 { 2106 /* stay until we have valid tpt */ 2107 if (current_tpt == IWL_INVALID_VALUE) { 2108 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 2109 return TPC_ACTION_STAY; 2110 } 2111 2112 /* Too many failures, increase txp */ 2113 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 2114 current_tpt == 0) { 2115 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 2116 return TPC_ACTION_NO_RESTIRCTION; 2117 } 2118 2119 /* try decreasing first if applicable */ 2120 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2121 weak != TPC_INVALID) { 2122 if (weak_tpt == IWL_INVALID_VALUE && 2123 (strong_tpt == IWL_INVALID_VALUE || 2124 current_tpt >= strong_tpt)) { 2125 IWL_DEBUG_RATE(mvm, 2126 "no weak txp measurement. decrease txp\n"); 2127 return TPC_ACTION_DECREASE; 2128 } 2129 2130 if (weak_tpt > current_tpt) { 2131 IWL_DEBUG_RATE(mvm, 2132 "lower txp has better tpt. decrease txp\n"); 2133 return TPC_ACTION_DECREASE; 2134 } 2135 } 2136 2137 /* next, increase if needed */ 2138 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 2139 strong != TPC_INVALID) { 2140 if (weak_tpt == IWL_INVALID_VALUE && 2141 strong_tpt != IWL_INVALID_VALUE && 2142 current_tpt < strong_tpt) { 2143 IWL_DEBUG_RATE(mvm, 2144 "higher txp has better tpt. increase txp\n"); 2145 return TPC_ACTION_INCREASE; 2146 } 2147 2148 if (weak_tpt < current_tpt && 2149 (strong_tpt == IWL_INVALID_VALUE || 2150 strong_tpt > current_tpt)) { 2151 IWL_DEBUG_RATE(mvm, 2152 "lower txp has worse tpt. increase txp\n"); 2153 return TPC_ACTION_INCREASE; 2154 } 2155 } 2156 2157 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2158 return TPC_ACTION_STAY; 2159 } 2160 2161 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2162 struct ieee80211_sta *sta, 2163 struct iwl_lq_sta *lq_sta, 2164 struct iwl_scale_tbl_info *tbl) 2165 { 2166 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2167 struct ieee80211_vif *vif = mvm_sta->vif; 2168 struct ieee80211_chanctx_conf *chanctx_conf; 2169 enum nl80211_band band; 2170 struct iwl_rate_scale_data *window; 2171 struct rs_rate *rate = &tbl->rate; 2172 enum tpc_action action; 2173 s32 sr; 2174 u8 cur = lq_sta->lq.reduced_tpc; 2175 int current_tpt; 2176 int weak, strong; 2177 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2178 2179 #ifdef CONFIG_MAC80211_DEBUGFS 2180 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2181 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2182 lq_sta->pers.dbg_fixed_txp_reduction); 2183 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2184 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2185 } 2186 #endif 2187 2188 rcu_read_lock(); 2189 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2190 if (WARN_ON(!chanctx_conf)) 2191 band = NUM_NL80211_BANDS; 2192 else 2193 band = chanctx_conf->def.chan->band; 2194 rcu_read_unlock(); 2195 2196 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2197 IWL_DEBUG_RATE(mvm, 2198 "tpc is not allowed. remove txp restrictions\n"); 2199 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2200 return cur != TPC_NO_REDUCTION; 2201 } 2202 2203 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2204 2205 /* Collect measured throughputs for current and adjacent rates */ 2206 window = tbl->tpc_win; 2207 sr = window[cur].success_ratio; 2208 current_tpt = window[cur].average_tpt; 2209 if (weak != TPC_INVALID) 2210 weak_tpt = window[weak].average_tpt; 2211 if (strong != TPC_INVALID) 2212 strong_tpt = window[strong].average_tpt; 2213 2214 IWL_DEBUG_RATE(mvm, 2215 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2216 cur, current_tpt, sr, weak, strong, 2217 weak_tpt, strong_tpt); 2218 2219 action = rs_get_tpc_action(mvm, sr, weak, strong, 2220 current_tpt, weak_tpt, strong_tpt); 2221 2222 /* override actions if we are on the edge */ 2223 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2224 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2225 action = TPC_ACTION_STAY; 2226 } else if (strong == TPC_INVALID && 2227 (action == TPC_ACTION_INCREASE || 2228 action == TPC_ACTION_NO_RESTIRCTION)) { 2229 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2230 action = TPC_ACTION_STAY; 2231 } 2232 2233 switch (action) { 2234 case TPC_ACTION_DECREASE: 2235 lq_sta->lq.reduced_tpc = weak; 2236 return true; 2237 case TPC_ACTION_INCREASE: 2238 lq_sta->lq.reduced_tpc = strong; 2239 return true; 2240 case TPC_ACTION_NO_RESTIRCTION: 2241 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2242 return true; 2243 case TPC_ACTION_STAY: 2244 /* do nothing */ 2245 break; 2246 } 2247 return false; 2248 } 2249 2250 /* 2251 * Do rate scaling and search for new modulation mode. 2252 */ 2253 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2254 struct ieee80211_sta *sta, 2255 struct iwl_lq_sta *lq_sta, 2256 int tid, bool ndp) 2257 { 2258 int low = IWL_RATE_INVALID; 2259 int high = IWL_RATE_INVALID; 2260 int index; 2261 struct iwl_rate_scale_data *window = NULL; 2262 int current_tpt = IWL_INVALID_VALUE; 2263 int low_tpt = IWL_INVALID_VALUE; 2264 int high_tpt = IWL_INVALID_VALUE; 2265 u32 fail_count; 2266 enum rs_action scale_action = RS_ACTION_STAY; 2267 u16 rate_mask; 2268 u8 update_lq = 0; 2269 struct iwl_scale_tbl_info *tbl, *tbl1; 2270 u8 active_tbl = 0; 2271 u8 done_search = 0; 2272 u16 high_low; 2273 s32 sr; 2274 u8 prev_agg = lq_sta->is_agg; 2275 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2276 struct rs_rate *rate; 2277 2278 lq_sta->is_agg = !!mvmsta->agg_tids; 2279 2280 /* 2281 * Select rate-scale / modulation-mode table to work with in 2282 * the rest of this function: "search" if searching for better 2283 * modulation mode, or "active" if doing rate scaling within a mode. 2284 */ 2285 if (!lq_sta->search_better_tbl) 2286 active_tbl = lq_sta->active_tbl; 2287 else 2288 active_tbl = 1 - lq_sta->active_tbl; 2289 2290 tbl = &(lq_sta->lq_info[active_tbl]); 2291 rate = &tbl->rate; 2292 2293 if (prev_agg != lq_sta->is_agg) { 2294 IWL_DEBUG_RATE(mvm, 2295 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2296 prev_agg, lq_sta->is_agg); 2297 rs_set_expected_tpt_table(lq_sta, tbl); 2298 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2299 } 2300 2301 /* current tx rate */ 2302 index = rate->index; 2303 2304 /* rates available for this association, and for modulation mode */ 2305 rate_mask = rs_get_supported_rates(lq_sta, rate); 2306 2307 if (!(BIT(index) & rate_mask)) { 2308 IWL_ERR(mvm, "Current Rate is not valid\n"); 2309 if (lq_sta->search_better_tbl) { 2310 /* revert to active table if search table is not valid*/ 2311 rate->type = LQ_NONE; 2312 lq_sta->search_better_tbl = 0; 2313 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2314 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2315 } 2316 return; 2317 } 2318 2319 /* Get expected throughput table and history window for current rate */ 2320 if (!tbl->expected_tpt) { 2321 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2322 return; 2323 } 2324 2325 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2326 window = &(tbl->win[index]); 2327 2328 /* 2329 * If there is not enough history to calculate actual average 2330 * throughput, keep analyzing results of more tx frames, without 2331 * changing rate or mode (bypass most of the rest of this function). 2332 * Set up new rate table in uCode only if old rate is not supported 2333 * in current association (use new rate found above). 2334 */ 2335 fail_count = window->counter - window->success_counter; 2336 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2337 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2338 IWL_DEBUG_RATE(mvm, 2339 "%s: Test Window: succ %d total %d\n", 2340 rs_pretty_rate(rate), 2341 window->success_counter, window->counter); 2342 2343 /* Can't calculate this yet; not enough history */ 2344 window->average_tpt = IWL_INVALID_VALUE; 2345 2346 /* Should we stay with this modulation mode, 2347 * or search for a new one? */ 2348 rs_stay_in_table(lq_sta, false); 2349 2350 return; 2351 } 2352 2353 /* If we are searching for better modulation mode, check success. */ 2354 if (lq_sta->search_better_tbl) { 2355 /* If good success, continue using the "search" mode; 2356 * no need to send new link quality command, since we're 2357 * continuing to use the setup that we've been trying. */ 2358 if (window->average_tpt > lq_sta->last_tpt) { 2359 IWL_DEBUG_RATE(mvm, 2360 "SWITCHING TO NEW TABLE SR: %d " 2361 "cur-tpt %d old-tpt %d\n", 2362 window->success_ratio, 2363 window->average_tpt, 2364 lq_sta->last_tpt); 2365 2366 /* Swap tables; "search" becomes "active" */ 2367 lq_sta->active_tbl = active_tbl; 2368 current_tpt = window->average_tpt; 2369 /* Else poor success; go back to mode in "active" table */ 2370 } else { 2371 IWL_DEBUG_RATE(mvm, 2372 "GOING BACK TO THE OLD TABLE: SR %d " 2373 "cur-tpt %d old-tpt %d\n", 2374 window->success_ratio, 2375 window->average_tpt, 2376 lq_sta->last_tpt); 2377 2378 /* Nullify "search" table */ 2379 rate->type = LQ_NONE; 2380 2381 /* Revert to "active" table */ 2382 active_tbl = lq_sta->active_tbl; 2383 tbl = &(lq_sta->lq_info[active_tbl]); 2384 2385 /* Revert to "active" rate and throughput info */ 2386 index = tbl->rate.index; 2387 current_tpt = lq_sta->last_tpt; 2388 2389 /* Need to set up a new rate table in uCode */ 2390 update_lq = 1; 2391 } 2392 2393 /* Either way, we've made a decision; modulation mode 2394 * search is done, allow rate adjustment next time. */ 2395 lq_sta->search_better_tbl = 0; 2396 done_search = 1; /* Don't switch modes below! */ 2397 goto lq_update; 2398 } 2399 2400 /* (Else) not in search of better modulation mode, try for better 2401 * starting rate, while staying in this mode. */ 2402 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2403 low = high_low & 0xff; 2404 high = (high_low >> 8) & 0xff; 2405 2406 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2407 2408 sr = window->success_ratio; 2409 2410 /* Collect measured throughputs for current and adjacent rates */ 2411 current_tpt = window->average_tpt; 2412 if (low != IWL_RATE_INVALID) 2413 low_tpt = tbl->win[low].average_tpt; 2414 if (high != IWL_RATE_INVALID) 2415 high_tpt = tbl->win[high].average_tpt; 2416 2417 IWL_DEBUG_RATE(mvm, 2418 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2419 rs_pretty_rate(rate), current_tpt, sr, 2420 low, high, low_tpt, high_tpt); 2421 2422 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2423 current_tpt, low_tpt, high_tpt); 2424 2425 /* Force a search in case BT doesn't like us being in MIMO */ 2426 if (is_mimo(rate) && 2427 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2428 IWL_DEBUG_RATE(mvm, 2429 "BT Coex forbids MIMO. Search for new config\n"); 2430 rs_stay_in_table(lq_sta, true); 2431 goto lq_update; 2432 } 2433 2434 switch (scale_action) { 2435 case RS_ACTION_DOWNSCALE: 2436 /* Decrease starting rate, update uCode's rate table */ 2437 if (low != IWL_RATE_INVALID) { 2438 update_lq = 1; 2439 index = low; 2440 } else { 2441 IWL_DEBUG_RATE(mvm, 2442 "At the bottom rate. Can't decrease\n"); 2443 } 2444 2445 break; 2446 case RS_ACTION_UPSCALE: 2447 /* Increase starting rate, update uCode's rate table */ 2448 if (high != IWL_RATE_INVALID) { 2449 update_lq = 1; 2450 index = high; 2451 } else { 2452 IWL_DEBUG_RATE(mvm, 2453 "At the top rate. Can't increase\n"); 2454 } 2455 2456 break; 2457 case RS_ACTION_STAY: 2458 /* No change */ 2459 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2460 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2461 break; 2462 default: 2463 break; 2464 } 2465 2466 lq_update: 2467 /* Replace uCode's rate table for the destination station. */ 2468 if (update_lq) { 2469 tbl->rate.index = index; 2470 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2471 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2472 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2473 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2474 } 2475 2476 rs_stay_in_table(lq_sta, false); 2477 2478 /* 2479 * Search for new modulation mode if we're: 2480 * 1) Not changing rates right now 2481 * 2) Not just finishing up a search 2482 * 3) Allowing a new search 2483 */ 2484 if (!update_lq && !done_search && 2485 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2486 && window->counter) { 2487 enum rs_column next_column; 2488 2489 /* Save current throughput to compare with "search" throughput*/ 2490 lq_sta->last_tpt = current_tpt; 2491 2492 IWL_DEBUG_RATE(mvm, 2493 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2494 update_lq, done_search, lq_sta->rs_state, 2495 window->counter); 2496 2497 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2498 if (next_column != RS_COLUMN_INVALID) { 2499 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2500 next_column); 2501 if (!ret) 2502 lq_sta->search_better_tbl = 1; 2503 } else { 2504 IWL_DEBUG_RATE(mvm, 2505 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2506 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2507 } 2508 2509 /* If new "search" mode was selected, set up in uCode table */ 2510 if (lq_sta->search_better_tbl) { 2511 /* Access the "search" table, clear its history. */ 2512 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]); 2513 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2514 2515 /* Use new "search" start rate */ 2516 index = tbl->rate.index; 2517 2518 rs_dump_rate(mvm, &tbl->rate, 2519 "Switch to SEARCH TABLE:"); 2520 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2521 } else { 2522 done_search = 1; 2523 } 2524 } 2525 2526 if (!ndp) 2527 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2528 2529 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2530 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2531 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2532 } 2533 } 2534 2535 struct rs_init_rate_info { 2536 s8 rssi; 2537 u8 rate_idx; 2538 }; 2539 2540 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2541 { -60, IWL_RATE_54M_INDEX }, 2542 { -64, IWL_RATE_48M_INDEX }, 2543 { -68, IWL_RATE_36M_INDEX }, 2544 { -80, IWL_RATE_24M_INDEX }, 2545 { -84, IWL_RATE_18M_INDEX }, 2546 { -85, IWL_RATE_12M_INDEX }, 2547 { -86, IWL_RATE_11M_INDEX }, 2548 { -88, IWL_RATE_5M_INDEX }, 2549 { -90, IWL_RATE_2M_INDEX }, 2550 { S8_MIN, IWL_RATE_1M_INDEX }, 2551 }; 2552 2553 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2554 { -60, IWL_RATE_54M_INDEX }, 2555 { -64, IWL_RATE_48M_INDEX }, 2556 { -72, IWL_RATE_36M_INDEX }, 2557 { -80, IWL_RATE_24M_INDEX }, 2558 { -84, IWL_RATE_18M_INDEX }, 2559 { -85, IWL_RATE_12M_INDEX }, 2560 { -87, IWL_RATE_9M_INDEX }, 2561 { S8_MIN, IWL_RATE_6M_INDEX }, 2562 }; 2563 2564 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2565 { -60, IWL_RATE_MCS_7_INDEX }, 2566 { -64, IWL_RATE_MCS_6_INDEX }, 2567 { -68, IWL_RATE_MCS_5_INDEX }, 2568 { -72, IWL_RATE_MCS_4_INDEX }, 2569 { -80, IWL_RATE_MCS_3_INDEX }, 2570 { -84, IWL_RATE_MCS_2_INDEX }, 2571 { -85, IWL_RATE_MCS_1_INDEX }, 2572 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2573 }; 2574 2575 /* MCS index 9 is not valid for 20MHz VHT channel width, 2576 * but is ok for 40, 80 and 160MHz channels. 2577 */ 2578 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2579 { -60, IWL_RATE_MCS_8_INDEX }, 2580 { -64, IWL_RATE_MCS_7_INDEX }, 2581 { -68, IWL_RATE_MCS_6_INDEX }, 2582 { -72, IWL_RATE_MCS_5_INDEX }, 2583 { -80, IWL_RATE_MCS_4_INDEX }, 2584 { -84, IWL_RATE_MCS_3_INDEX }, 2585 { -85, IWL_RATE_MCS_2_INDEX }, 2586 { -87, IWL_RATE_MCS_1_INDEX }, 2587 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2588 }; 2589 2590 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2591 { -60, IWL_RATE_MCS_9_INDEX }, 2592 { -64, IWL_RATE_MCS_8_INDEX }, 2593 { -68, IWL_RATE_MCS_7_INDEX }, 2594 { -72, IWL_RATE_MCS_6_INDEX }, 2595 { -80, IWL_RATE_MCS_5_INDEX }, 2596 { -84, IWL_RATE_MCS_4_INDEX }, 2597 { -85, IWL_RATE_MCS_3_INDEX }, 2598 { -87, IWL_RATE_MCS_2_INDEX }, 2599 { -88, IWL_RATE_MCS_1_INDEX }, 2600 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2601 }; 2602 2603 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2604 2605 /* Init the optimal rate based on STA caps 2606 * This combined with rssi is used to report the last tx rate 2607 * to userspace when we haven't transmitted enough frames. 2608 */ 2609 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2610 struct ieee80211_sta *sta, 2611 struct iwl_lq_sta *lq_sta) 2612 { 2613 struct rs_rate *rate = &lq_sta->optimal_rate; 2614 2615 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2616 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2617 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2618 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2619 else if (lq_sta->band == NL80211_BAND_5GHZ) 2620 rate->type = LQ_LEGACY_A; 2621 else 2622 rate->type = LQ_LEGACY_G; 2623 2624 rate->bw = rs_bw_from_sta_bw(sta); 2625 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2626 2627 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2628 2629 if (is_mimo(rate)) { 2630 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2631 } else if (is_siso(rate)) { 2632 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2633 } else { 2634 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2635 2636 if (lq_sta->band == NL80211_BAND_5GHZ) { 2637 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2638 lq_sta->optimal_nentries = 2639 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2640 } else { 2641 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2642 lq_sta->optimal_nentries = 2643 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2644 } 2645 } 2646 2647 if (is_vht(rate)) { 2648 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2649 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2650 lq_sta->optimal_nentries = 2651 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2652 } else { 2653 lq_sta->optimal_rates = rs_optimal_rates_vht; 2654 lq_sta->optimal_nentries = 2655 ARRAY_SIZE(rs_optimal_rates_vht); 2656 } 2657 } else if (is_ht(rate)) { 2658 lq_sta->optimal_rates = rs_optimal_rates_ht; 2659 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2660 } 2661 } 2662 2663 /* Compute the optimal rate index based on RSSI */ 2664 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2665 struct iwl_lq_sta *lq_sta) 2666 { 2667 struct rs_rate *rate = &lq_sta->optimal_rate; 2668 int i; 2669 2670 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2671 BITS_PER_LONG); 2672 2673 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2674 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2675 2676 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2677 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2678 rate->index = rate_idx; 2679 break; 2680 } 2681 } 2682 2683 return rate; 2684 } 2685 2686 /* Choose an initial legacy rate and antenna to use based on the RSSI 2687 * of last Rx 2688 */ 2689 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2690 struct ieee80211_sta *sta, 2691 struct iwl_lq_sta *lq_sta, 2692 enum nl80211_band band, 2693 struct rs_rate *rate, 2694 bool init) 2695 { 2696 int i, nentries; 2697 unsigned long active_rate; 2698 s8 best_rssi = S8_MIN; 2699 u8 best_ant = ANT_NONE; 2700 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2701 const struct rs_init_rate_info *initial_rates; 2702 2703 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2704 if (!(lq_sta->pers.chains & BIT(i))) 2705 continue; 2706 2707 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2708 best_rssi = lq_sta->pers.chain_signal[i]; 2709 best_ant = BIT(i); 2710 } 2711 } 2712 2713 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2714 rs_pretty_ant(best_ant), best_rssi); 2715 2716 if (best_ant != ANT_A && best_ant != ANT_B) 2717 rate->ant = first_antenna(valid_tx_ant); 2718 else 2719 rate->ant = best_ant; 2720 2721 rate->sgi = false; 2722 rate->ldpc = false; 2723 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2724 2725 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2726 BITS_PER_LONG); 2727 2728 if (band == NL80211_BAND_5GHZ) { 2729 rate->type = LQ_LEGACY_A; 2730 initial_rates = rs_optimal_rates_5ghz_legacy; 2731 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2732 } else { 2733 rate->type = LQ_LEGACY_G; 2734 initial_rates = rs_optimal_rates_24ghz_legacy; 2735 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2736 } 2737 2738 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2739 goto out; 2740 2741 /* Start from a higher rate if the corresponding debug capability 2742 * is enabled. The rate is chosen according to AP capabilities. 2743 * In case of VHT/HT when the rssi is low fallback to the case of 2744 * legacy rates. 2745 */ 2746 if (sta->vht_cap.vht_supported && 2747 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2748 /* 2749 * In AP mode, when a new station associates, rs is initialized 2750 * immediately upon association completion, before the phy 2751 * context is updated with the association parameters, so the 2752 * sta bandwidth might be wider than the phy context allows. 2753 * To avoid this issue, always initialize rs with 20mhz 2754 * bandwidth rate, and after authorization, when the phy context 2755 * is already up-to-date, re-init rs with the correct bw. 2756 */ 2757 u32 bw = init ? RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2758 2759 switch (bw) { 2760 case RATE_MCS_CHAN_WIDTH_40: 2761 case RATE_MCS_CHAN_WIDTH_80: 2762 case RATE_MCS_CHAN_WIDTH_160: 2763 initial_rates = rs_optimal_rates_vht; 2764 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2765 break; 2766 case RATE_MCS_CHAN_WIDTH_20: 2767 initial_rates = rs_optimal_rates_vht_20mhz; 2768 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2769 break; 2770 default: 2771 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2772 goto out; 2773 } 2774 2775 active_rate = lq_sta->active_siso_rate; 2776 rate->type = LQ_VHT_SISO; 2777 rate->bw = bw; 2778 } else if (sta->ht_cap.ht_supported && 2779 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2780 initial_rates = rs_optimal_rates_ht; 2781 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2782 active_rate = lq_sta->active_siso_rate; 2783 rate->type = LQ_HT_SISO; 2784 } else { 2785 active_rate = lq_sta->active_legacy_rate; 2786 } 2787 2788 for (i = 0; i < nentries; i++) { 2789 int rate_idx = initial_rates[i].rate_idx; 2790 2791 if ((best_rssi >= initial_rates[i].rssi) && 2792 (BIT(rate_idx) & active_rate)) { 2793 rate->index = rate_idx; 2794 break; 2795 } 2796 } 2797 2798 out: 2799 rs_dump_rate(mvm, rate, "INITIAL"); 2800 } 2801 2802 /* Save info about RSSI of last Rx */ 2803 void rs_update_last_rssi(struct iwl_mvm *mvm, 2804 struct iwl_mvm_sta *mvmsta, 2805 struct ieee80211_rx_status *rx_status) 2806 { 2807 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2808 int i; 2809 2810 lq_sta->pers.chains = rx_status->chains; 2811 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2812 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2813 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2814 lq_sta->pers.last_rssi = S8_MIN; 2815 2816 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2817 if (!(lq_sta->pers.chains & BIT(i))) 2818 continue; 2819 2820 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2821 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2822 } 2823 } 2824 2825 /** 2826 * rs_initialize_lq - Initialize a station's hardware rate table 2827 * 2828 * The uCode's station table contains a table of fallback rates 2829 * for automatic fallback during transmission. 2830 * 2831 * NOTE: This sets up a default set of values. These will be replaced later 2832 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2833 * rc80211_simple. 2834 * 2835 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2836 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2837 * which requires station table entry to exist). 2838 */ 2839 static void rs_initialize_lq(struct iwl_mvm *mvm, 2840 struct ieee80211_sta *sta, 2841 struct iwl_lq_sta *lq_sta, 2842 enum nl80211_band band, 2843 bool init) 2844 { 2845 struct iwl_scale_tbl_info *tbl; 2846 struct rs_rate *rate; 2847 u8 active_tbl = 0; 2848 2849 if (!sta || !lq_sta) 2850 return; 2851 2852 if (!lq_sta->search_better_tbl) 2853 active_tbl = lq_sta->active_tbl; 2854 else 2855 active_tbl = 1 - lq_sta->active_tbl; 2856 2857 tbl = &(lq_sta->lq_info[active_tbl]); 2858 rate = &tbl->rate; 2859 2860 rs_get_initial_rate(mvm, sta, lq_sta, band, rate, init); 2861 rs_init_optimal_rate(mvm, sta, lq_sta); 2862 2863 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2864 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2865 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2866 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2867 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_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2877 void *mvm_sta, 2878 struct ieee80211_tx_rate_control *txrc) 2879 { 2880 struct iwl_op_mode *op_mode = mvm_r; 2881 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2882 struct sk_buff *skb = txrc->skb; 2883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2884 struct iwl_lq_sta *lq_sta; 2885 struct rs_rate *optimal_rate; 2886 u32 last_ucode_rate; 2887 2888 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2889 /* if vif isn't initialized mvm doesn't know about 2890 * this station, so don't do anything with the it 2891 */ 2892 sta = NULL; 2893 mvm_sta = NULL; 2894 } 2895 2896 /* Send management frames and NO_ACK data using lowest rate. */ 2897 if (rate_control_send_low(sta, mvm_sta, txrc)) 2898 return; 2899 2900 if (!mvm_sta) 2901 return; 2902 2903 lq_sta = mvm_sta; 2904 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2905 info->band, &info->control.rates[0]); 2906 info->control.rates[0].count = 1; 2907 2908 /* Report the optimal rate based on rssi and STA caps if we haven't 2909 * converged yet (too little traffic) or exploring other modulations 2910 */ 2911 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2912 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2913 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2914 optimal_rate); 2915 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2916 &txrc->reported_rate); 2917 } 2918 } 2919 2920 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2921 gfp_t gfp) 2922 { 2923 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2924 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2925 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2926 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2927 2928 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2929 2930 lq_sta->pers.drv = mvm; 2931 #ifdef CONFIG_MAC80211_DEBUGFS 2932 lq_sta->pers.dbg_fixed_rate = 0; 2933 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2934 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2935 #endif 2936 lq_sta->pers.chains = 0; 2937 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2938 lq_sta->pers.last_rssi = S8_MIN; 2939 2940 return lq_sta; 2941 } 2942 2943 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2944 int nss) 2945 { 2946 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2947 (0x3 << (2 * (nss - 1))); 2948 rx_mcs >>= (2 * (nss - 1)); 2949 2950 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2951 return IWL_RATE_MCS_7_INDEX; 2952 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2953 return IWL_RATE_MCS_8_INDEX; 2954 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2955 return IWL_RATE_MCS_9_INDEX; 2956 2957 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2958 return -1; 2959 } 2960 2961 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2962 struct ieee80211_sta_vht_cap *vht_cap, 2963 struct iwl_lq_sta *lq_sta) 2964 { 2965 int i; 2966 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2967 2968 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2969 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2970 if (i == IWL_RATE_9M_INDEX) 2971 continue; 2972 2973 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2974 if (i == IWL_RATE_MCS_9_INDEX && 2975 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2976 continue; 2977 2978 lq_sta->active_siso_rate |= BIT(i); 2979 } 2980 } 2981 2982 if (sta->rx_nss < 2) 2983 return; 2984 2985 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2986 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2987 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2988 if (i == IWL_RATE_9M_INDEX) 2989 continue; 2990 2991 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2992 if (i == IWL_RATE_MCS_9_INDEX && 2993 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2994 continue; 2995 2996 lq_sta->active_mimo2_rate |= BIT(i); 2997 } 2998 } 2999 } 3000 3001 static void rs_ht_init(struct iwl_mvm *mvm, 3002 struct ieee80211_sta *sta, 3003 struct iwl_lq_sta *lq_sta, 3004 struct ieee80211_sta_ht_cap *ht_cap) 3005 { 3006 /* active_siso_rate mask includes 9 MBits (bit 5), 3007 * and CCK (bits 0-3), supp_rates[] does not; 3008 * shift to convert format, force 9 MBits off. 3009 */ 3010 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 3011 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 3012 lq_sta->active_siso_rate &= ~((u16)0x2); 3013 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 3014 3015 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 3016 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 3017 lq_sta->active_mimo2_rate &= ~((u16)0x2); 3018 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 3019 3020 if (mvm->cfg->ht_params->ldpc && 3021 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 3022 lq_sta->ldpc = true; 3023 3024 if (mvm->cfg->ht_params->stbc && 3025 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3026 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 3027 lq_sta->stbc_capable = true; 3028 3029 lq_sta->is_vht = false; 3030 } 3031 3032 static void rs_vht_init(struct iwl_mvm *mvm, 3033 struct ieee80211_sta *sta, 3034 struct iwl_lq_sta *lq_sta, 3035 struct ieee80211_sta_vht_cap *vht_cap) 3036 { 3037 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 3038 3039 if (mvm->cfg->ht_params->ldpc && 3040 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 3041 lq_sta->ldpc = true; 3042 3043 if (mvm->cfg->ht_params->stbc && 3044 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3045 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 3046 lq_sta->stbc_capable = true; 3047 3048 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 3049 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 3050 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 3051 lq_sta->bfer_capable = true; 3052 3053 lq_sta->is_vht = true; 3054 } 3055 3056 #ifdef CONFIG_IWLWIFI_DEBUGFS 3057 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 3058 { 3059 spin_lock_bh(&mvm->drv_stats_lock); 3060 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 3061 spin_unlock_bh(&mvm->drv_stats_lock); 3062 } 3063 3064 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 3065 { 3066 u8 nss = 0; 3067 3068 spin_lock(&mvm->drv_stats_lock); 3069 3070 if (agg) 3071 mvm->drv_rx_stats.agg_frames++; 3072 3073 mvm->drv_rx_stats.success_frames++; 3074 3075 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3076 case RATE_MCS_CHAN_WIDTH_20: 3077 mvm->drv_rx_stats.bw_20_frames++; 3078 break; 3079 case RATE_MCS_CHAN_WIDTH_40: 3080 mvm->drv_rx_stats.bw_40_frames++; 3081 break; 3082 case RATE_MCS_CHAN_WIDTH_80: 3083 mvm->drv_rx_stats.bw_80_frames++; 3084 break; 3085 case RATE_MCS_CHAN_WIDTH_160: 3086 mvm->drv_rx_stats.bw_160_frames++; 3087 break; 3088 default: 3089 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 3090 } 3091 3092 if (rate & RATE_MCS_HT_MSK) { 3093 mvm->drv_rx_stats.ht_frames++; 3094 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 3095 } else if (rate & RATE_MCS_VHT_MSK) { 3096 mvm->drv_rx_stats.vht_frames++; 3097 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 3098 RATE_VHT_MCS_NSS_POS) + 1; 3099 } else { 3100 mvm->drv_rx_stats.legacy_frames++; 3101 } 3102 3103 if (nss == 1) 3104 mvm->drv_rx_stats.siso_frames++; 3105 else if (nss == 2) 3106 mvm->drv_rx_stats.mimo2_frames++; 3107 3108 if (rate & RATE_MCS_SGI_MSK) 3109 mvm->drv_rx_stats.sgi_frames++; 3110 else 3111 mvm->drv_rx_stats.ngi_frames++; 3112 3113 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 3114 mvm->drv_rx_stats.last_frame_idx = 3115 (mvm->drv_rx_stats.last_frame_idx + 1) % 3116 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 3117 3118 spin_unlock(&mvm->drv_stats_lock); 3119 } 3120 #endif 3121 3122 /* 3123 * Called after adding a new station to initialize rate scaling 3124 */ 3125 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3126 enum nl80211_band band, bool init) 3127 { 3128 int i, j; 3129 struct ieee80211_hw *hw = mvm->hw; 3130 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 3131 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 3132 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3133 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3134 struct ieee80211_supported_band *sband; 3135 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 3136 3137 /* clear all non-persistent lq data */ 3138 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 3139 3140 sband = hw->wiphy->bands[band]; 3141 3142 lq_sta->lq.sta_id = mvmsta->sta_id; 3143 mvmsta->amsdu_enabled = 0; 3144 mvmsta->max_amsdu_len = sta->max_amsdu_len; 3145 3146 for (j = 0; j < LQ_SIZE; j++) 3147 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 3148 3149 lq_sta->flush_timer = 0; 3150 lq_sta->last_tx = jiffies; 3151 3152 IWL_DEBUG_RATE(mvm, 3153 "LQ: *** rate scale station global init for station %d ***\n", 3154 mvmsta->sta_id); 3155 /* TODO: what is a good starting rate for STA? About middle? Maybe not 3156 * the lowest or the highest rate.. Could consider using RSSI from 3157 * previous packets? Need to have IEEE 802.1X auth succeed immediately 3158 * after assoc.. */ 3159 3160 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3161 lq_sta->band = sband->band; 3162 /* 3163 * active legacy rates as per supported rates bitmap 3164 */ 3165 supp = sta->supp_rates[sband->band]; 3166 lq_sta->active_legacy_rate = 0; 3167 for_each_set_bit(i, &supp, BITS_PER_LONG) 3168 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3169 3170 /* TODO: should probably account for rx_highest for both HT/VHT */ 3171 if (!vht_cap || !vht_cap->vht_supported) 3172 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3173 else 3174 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3175 3176 lq_sta->max_legacy_rate_idx = 3177 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3178 lq_sta->max_siso_rate_idx = 3179 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3180 lq_sta->max_mimo2_rate_idx = 3181 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3182 3183 IWL_DEBUG_RATE(mvm, 3184 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3185 lq_sta->active_legacy_rate, 3186 lq_sta->active_siso_rate, 3187 lq_sta->active_mimo2_rate, 3188 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3189 lq_sta->bfer_capable); 3190 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3191 lq_sta->max_legacy_rate_idx, 3192 lq_sta->max_siso_rate_idx, 3193 lq_sta->max_mimo2_rate_idx); 3194 3195 /* These values will be overridden later */ 3196 lq_sta->lq.single_stream_ant_msk = 3197 first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 3198 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3199 3200 /* as default allow aggregation for all tids */ 3201 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3202 lq_sta->is_agg = 0; 3203 #ifdef CONFIG_IWLWIFI_DEBUGFS 3204 iwl_mvm_reset_frame_stats(mvm); 3205 #endif 3206 rs_initialize_lq(mvm, sta, lq_sta, band, init); 3207 } 3208 3209 static void rs_drv_rate_update(void *mvm_r, 3210 struct ieee80211_supported_band *sband, 3211 struct cfg80211_chan_def *chandef, 3212 struct ieee80211_sta *sta, 3213 void *priv_sta, u32 changed) 3214 { 3215 struct iwl_op_mode *op_mode = mvm_r; 3216 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3217 u8 tid; 3218 3219 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3220 return; 3221 3222 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3223 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3224 ieee80211_stop_tx_ba_session(sta, tid); 3225 3226 iwl_mvm_rs_rate_init(mvm, sta, sband->band, false); 3227 } 3228 3229 #ifdef CONFIG_MAC80211_DEBUGFS 3230 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3231 struct iwl_lq_cmd *lq_cmd, 3232 enum nl80211_band band, 3233 u32 ucode_rate) 3234 { 3235 struct rs_rate rate; 3236 int i; 3237 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3238 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3239 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3240 3241 for (i = 0; i < num_rates; i++) 3242 lq_cmd->rs_table[i] = ucode_rate_le32; 3243 3244 rs_rate_from_ucode_rate(ucode_rate, band, &rate); 3245 3246 if (is_mimo(&rate)) 3247 lq_cmd->mimo_delim = num_rates - 1; 3248 else 3249 lq_cmd->mimo_delim = 0; 3250 3251 lq_cmd->reduced_tpc = 0; 3252 3253 if (num_of_ant(ant) == 1) 3254 lq_cmd->single_stream_ant_msk = ant; 3255 3256 if (!mvm->trans->cfg->gen2) 3257 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3258 else 3259 lq_cmd->agg_frame_cnt_limit = 3260 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3261 } 3262 #endif /* CONFIG_MAC80211_DEBUGFS */ 3263 3264 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3265 struct iwl_lq_sta *lq_sta, 3266 struct rs_rate *rate, 3267 __le32 *rs_table, int *rs_table_index, 3268 int num_rates, int num_retries, 3269 u8 valid_tx_ant, bool toggle_ant) 3270 { 3271 int i, j; 3272 __le32 ucode_rate; 3273 bool bottom_reached = false; 3274 int prev_rate_idx = rate->index; 3275 int end = LINK_QUAL_MAX_RETRY_NUM; 3276 int index = *rs_table_index; 3277 3278 for (i = 0; i < num_rates && index < end; i++) { 3279 for (j = 0; j < num_retries && index < end; j++, index++) { 3280 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3281 rate)); 3282 rs_table[index] = ucode_rate; 3283 if (toggle_ant) 3284 rs_toggle_antenna(valid_tx_ant, rate); 3285 } 3286 3287 prev_rate_idx = rate->index; 3288 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3289 if (bottom_reached && !is_legacy(rate)) 3290 break; 3291 } 3292 3293 if (!bottom_reached && !is_legacy(rate)) 3294 rate->index = prev_rate_idx; 3295 3296 *rs_table_index = index; 3297 } 3298 3299 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3300 * column the rate table should look like this: 3301 * 3302 * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3303 * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3304 * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3305 * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3306 * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3307 * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3308 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3309 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3310 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3311 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3312 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3313 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3314 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3315 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3316 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3317 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3318 */ 3319 static void rs_build_rates_table(struct iwl_mvm *mvm, 3320 struct ieee80211_sta *sta, 3321 struct iwl_lq_sta *lq_sta, 3322 const struct rs_rate *initial_rate) 3323 { 3324 struct rs_rate rate; 3325 int num_rates, num_retries, index = 0; 3326 u8 valid_tx_ant = 0; 3327 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3328 bool toggle_ant = false; 3329 u32 color; 3330 3331 memcpy(&rate, initial_rate, sizeof(rate)); 3332 3333 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3334 3335 /* TODO: remove old API when min FW API hits 14 */ 3336 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3337 rs_stbc_allow(mvm, sta, lq_sta)) 3338 rate.stbc = true; 3339 3340 if (is_siso(&rate)) { 3341 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3342 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3343 } else if (is_mimo(&rate)) { 3344 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3345 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3346 } else { 3347 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3348 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3349 toggle_ant = true; 3350 } 3351 3352 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3353 num_rates, num_retries, valid_tx_ant, 3354 toggle_ant); 3355 3356 rs_get_lower_rate_down_column(lq_sta, &rate); 3357 3358 if (is_siso(&rate)) { 3359 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3360 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3361 lq_cmd->mimo_delim = index; 3362 } else if (is_legacy(&rate)) { 3363 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3364 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3365 } else { 3366 WARN_ON_ONCE(1); 3367 } 3368 3369 toggle_ant = true; 3370 3371 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3372 num_rates, num_retries, valid_tx_ant, 3373 toggle_ant); 3374 3375 rs_get_lower_rate_down_column(lq_sta, &rate); 3376 3377 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3378 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3379 3380 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3381 num_rates, num_retries, valid_tx_ant, 3382 toggle_ant); 3383 3384 /* update the color of the LQ command (as a counter at bits 1-3) */ 3385 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3386 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3387 } 3388 3389 struct rs_bfer_active_iter_data { 3390 struct ieee80211_sta *exclude_sta; 3391 struct iwl_mvm_sta *bfer_mvmsta; 3392 }; 3393 3394 static void rs_bfer_active_iter(void *_data, 3395 struct ieee80211_sta *sta) 3396 { 3397 struct rs_bfer_active_iter_data *data = _data; 3398 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3399 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3400 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3401 3402 if (sta == data->exclude_sta) 3403 return; 3404 3405 /* The current sta has BFER allowed */ 3406 if (ss_params & LQ_SS_BFER_ALLOWED) { 3407 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3408 3409 data->bfer_mvmsta = mvmsta; 3410 } 3411 } 3412 3413 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3414 { 3415 int prio = -1; 3416 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3417 3418 switch (viftype) { 3419 case NL80211_IFTYPE_AP: 3420 case NL80211_IFTYPE_P2P_GO: 3421 prio = 3; 3422 break; 3423 case NL80211_IFTYPE_P2P_CLIENT: 3424 prio = 2; 3425 break; 3426 case NL80211_IFTYPE_STATION: 3427 prio = 1; 3428 break; 3429 default: 3430 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3431 prio = -1; 3432 } 3433 3434 return prio; 3435 } 3436 3437 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3438 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3439 struct iwl_mvm_sta *sta2) 3440 { 3441 int prio1 = rs_bfer_priority(sta1); 3442 int prio2 = rs_bfer_priority(sta2); 3443 3444 if (prio1 > prio2) 3445 return 1; 3446 if (prio1 < prio2) 3447 return -1; 3448 return 0; 3449 } 3450 3451 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3452 struct ieee80211_sta *sta, 3453 struct iwl_lq_sta *lq_sta, 3454 const struct rs_rate *initial_rate) 3455 { 3456 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3457 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3458 struct rs_bfer_active_iter_data data = { 3459 .exclude_sta = sta, 3460 .bfer_mvmsta = NULL, 3461 }; 3462 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3463 u32 ss_params = LQ_SS_PARAMS_VALID; 3464 3465 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3466 goto out; 3467 3468 #ifdef CONFIG_MAC80211_DEBUGFS 3469 /* Check if forcing the decision is configured. 3470 * Note that SISO is forced by not allowing STBC or BFER 3471 */ 3472 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3473 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3474 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3475 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3476 3477 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3478 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3479 lq_sta->pers.ss_force); 3480 goto out; 3481 } 3482 #endif 3483 3484 if (lq_sta->stbc_capable) 3485 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3486 3487 if (!lq_sta->bfer_capable) 3488 goto out; 3489 3490 ieee80211_iterate_stations_atomic(mvm->hw, 3491 rs_bfer_active_iter, 3492 &data); 3493 bfer_mvmsta = data.bfer_mvmsta; 3494 3495 /* This code is safe as it doesn't run concurrently for different 3496 * stations. This is guaranteed by the fact that calls to 3497 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3498 */ 3499 if (!bfer_mvmsta) { 3500 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3501 3502 ss_params |= LQ_SS_BFER_ALLOWED; 3503 goto out; 3504 } 3505 3506 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3507 bfer_mvmsta->sta_id); 3508 3509 /* Disallow BFER on another STA if active and we're a higher priority */ 3510 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3511 struct iwl_lq_cmd *bfersta_lq_cmd = 3512 &bfer_mvmsta->lq_sta.rs_drv.lq; 3513 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3514 3515 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3516 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3517 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false); 3518 3519 ss_params |= LQ_SS_BFER_ALLOWED; 3520 IWL_DEBUG_RATE(mvm, 3521 "Lower priority BFER sta found (%d). Switch BFER\n", 3522 bfer_mvmsta->sta_id); 3523 } 3524 out: 3525 lq_cmd->ss_params = cpu_to_le32(ss_params); 3526 } 3527 3528 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3529 struct ieee80211_sta *sta, 3530 struct iwl_lq_sta *lq_sta, 3531 const struct rs_rate *initial_rate) 3532 { 3533 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3534 struct iwl_mvm_sta *mvmsta; 3535 struct iwl_mvm_vif *mvmvif; 3536 3537 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3538 lq_cmd->agg_time_limit = 3539 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3540 3541 #ifdef CONFIG_MAC80211_DEBUGFS 3542 if (lq_sta->pers.dbg_fixed_rate) { 3543 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3544 lq_sta->band, 3545 lq_sta->pers.dbg_fixed_rate); 3546 return; 3547 } 3548 #endif 3549 if (WARN_ON_ONCE(!sta || !initial_rate)) 3550 return; 3551 3552 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3553 3554 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3555 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3556 3557 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3558 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3559 3560 if (num_of_ant(initial_rate->ant) == 1) 3561 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3562 3563 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3564 3565 /* 3566 * In case of low latency, tell the firmware to leave a frame in the 3567 * Tx Fifo so that it can start a transaction in the same TxOP. This 3568 * basically allows the firmware to send bursts. 3569 */ 3570 if (iwl_mvm_vif_low_latency(mvmvif)) 3571 lq_cmd->agg_frame_cnt_limit--; 3572 3573 if (mvmsta->vif->p2p) 3574 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3575 3576 lq_cmd->agg_time_limit = 3577 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3578 } 3579 3580 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir) 3581 { 3582 return hw->priv; 3583 } 3584 3585 /* rate scale requires free function to be implemented */ 3586 static void rs_free(void *mvm_rate) 3587 { 3588 return; 3589 } 3590 3591 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3592 { 3593 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3594 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3595 3596 IWL_DEBUG_RATE(mvm, "enter\n"); 3597 IWL_DEBUG_RATE(mvm, "leave\n"); 3598 } 3599 3600 #ifdef CONFIG_MAC80211_DEBUGFS 3601 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3602 { 3603 3604 char *type, *bw; 3605 u8 mcs = 0, nss = 0; 3606 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3607 3608 if (!(rate & RATE_MCS_HT_MSK) && 3609 !(rate & RATE_MCS_VHT_MSK)) { 3610 int index = iwl_hwrate_to_plcp_idx(rate); 3611 3612 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n", 3613 rs_pretty_ant(ant), 3614 index == IWL_RATE_INVALID ? "BAD" : 3615 iwl_rate_mcs[index].mbps); 3616 } 3617 3618 if (rate & RATE_MCS_VHT_MSK) { 3619 type = "VHT"; 3620 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3621 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3622 >> RATE_VHT_MCS_NSS_POS) + 1; 3623 } else if (rate & RATE_MCS_HT_MSK) { 3624 type = "HT"; 3625 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3626 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3627 >> RATE_HT_MCS_NSS_POS) + 1; 3628 } else { 3629 type = "Unknown"; /* shouldn't happen */ 3630 } 3631 3632 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3633 case RATE_MCS_CHAN_WIDTH_20: 3634 bw = "20Mhz"; 3635 break; 3636 case RATE_MCS_CHAN_WIDTH_40: 3637 bw = "40Mhz"; 3638 break; 3639 case RATE_MCS_CHAN_WIDTH_80: 3640 bw = "80Mhz"; 3641 break; 3642 case RATE_MCS_CHAN_WIDTH_160: 3643 bw = "160Mhz"; 3644 break; 3645 default: 3646 bw = "BAD BW"; 3647 } 3648 3649 return scnprintf(buf, bufsz, 3650 "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n", 3651 type, rs_pretty_ant(ant), bw, mcs, nss, 3652 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3653 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3654 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3655 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3656 } 3657 3658 /** 3659 * Program the device to use fixed rate for frame transmit 3660 * This is for debugging/testing only 3661 * once the device start use fixed rate, we need to reload the module 3662 * to being back the normal operation. 3663 */ 3664 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3665 struct iwl_lq_sta *lq_sta) 3666 { 3667 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3668 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3669 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3670 3671 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3672 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3673 3674 if (lq_sta->pers.dbg_fixed_rate) { 3675 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3676 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false); 3677 } 3678 } 3679 3680 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3681 const char __user *user_buf, size_t count, loff_t *ppos) 3682 { 3683 struct iwl_lq_sta *lq_sta = file->private_data; 3684 struct iwl_mvm *mvm; 3685 char buf[64]; 3686 size_t buf_size; 3687 u32 parsed_rate; 3688 3689 mvm = lq_sta->pers.drv; 3690 memset(buf, 0, sizeof(buf)); 3691 buf_size = min(count, sizeof(buf) - 1); 3692 if (copy_from_user(buf, user_buf, buf_size)) 3693 return -EFAULT; 3694 3695 if (sscanf(buf, "%x", &parsed_rate) == 1) 3696 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3697 else 3698 lq_sta->pers.dbg_fixed_rate = 0; 3699 3700 rs_program_fix_rate(mvm, lq_sta); 3701 3702 return count; 3703 } 3704 3705 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3706 char __user *user_buf, size_t count, loff_t *ppos) 3707 { 3708 char *buff; 3709 int desc = 0; 3710 int i = 0; 3711 ssize_t ret; 3712 static const size_t bufsz = 2048; 3713 3714 struct iwl_lq_sta *lq_sta = file->private_data; 3715 struct iwl_mvm_sta *mvmsta = 3716 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3717 struct iwl_mvm *mvm; 3718 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3719 struct rs_rate *rate = &tbl->rate; 3720 u32 ss_params; 3721 3722 mvm = lq_sta->pers.drv; 3723 buff = kmalloc(bufsz, GFP_KERNEL); 3724 if (!buff) 3725 return -ENOMEM; 3726 3727 desc += scnprintf(buff + desc, bufsz - desc, 3728 "sta_id %d\n", lq_sta->lq.sta_id); 3729 desc += scnprintf(buff + desc, bufsz - desc, 3730 "failed=%d success=%d rate=0%lX\n", 3731 lq_sta->total_failed, lq_sta->total_success, 3732 lq_sta->active_legacy_rate); 3733 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3734 lq_sta->pers.dbg_fixed_rate); 3735 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3736 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3737 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3738 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3739 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3740 (is_legacy(rate)) ? "legacy" : 3741 is_vht(rate) ? "VHT" : "HT"); 3742 if (!is_legacy(rate)) { 3743 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3744 (is_siso(rate)) ? "SISO" : "MIMO2"); 3745 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3746 (is_ht20(rate)) ? "20MHz" : 3747 (is_ht40(rate)) ? "40MHz" : 3748 (is_ht80(rate)) ? "80MHz" : 3749 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3750 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3751 (rate->sgi) ? "SGI" : "NGI", 3752 (rate->ldpc) ? "LDPC" : "BCC", 3753 (lq_sta->is_agg) ? "AGG on" : "", 3754 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3755 } 3756 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3757 lq_sta->last_rate_n_flags); 3758 desc += scnprintf(buff + desc, bufsz - desc, 3759 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3760 lq_sta->lq.flags, 3761 lq_sta->lq.mimo_delim, 3762 lq_sta->lq.single_stream_ant_msk, 3763 lq_sta->lq.dual_stream_ant_msk); 3764 3765 desc += scnprintf(buff + desc, bufsz - desc, 3766 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3767 le16_to_cpu(lq_sta->lq.agg_time_limit), 3768 lq_sta->lq.agg_disable_start_th, 3769 lq_sta->lq.agg_frame_cnt_limit); 3770 3771 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3772 lq_sta->lq.reduced_tpc); 3773 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3774 desc += scnprintf(buff + desc, bufsz - desc, 3775 "single stream params: %s%s%s%s\n", 3776 (ss_params & LQ_SS_PARAMS_VALID) ? 3777 "VALID" : "INVALID", 3778 (ss_params & LQ_SS_BFER_ALLOWED) ? 3779 ", BFER" : "", 3780 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3781 ", STBC" : "", 3782 (ss_params & LQ_SS_FORCE) ? 3783 ", FORCE" : ""); 3784 desc += scnprintf(buff + desc, bufsz - desc, 3785 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3786 lq_sta->lq.initial_rate_index[0], 3787 lq_sta->lq.initial_rate_index[1], 3788 lq_sta->lq.initial_rate_index[2], 3789 lq_sta->lq.initial_rate_index[3]); 3790 3791 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3792 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3793 3794 desc += scnprintf(buff + desc, bufsz - desc, 3795 " rate[%d] 0x%X ", i, r); 3796 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3797 } 3798 3799 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3800 kfree(buff); 3801 return ret; 3802 } 3803 3804 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3805 .write = rs_sta_dbgfs_scale_table_write, 3806 .read = rs_sta_dbgfs_scale_table_read, 3807 .open = simple_open, 3808 .llseek = default_llseek, 3809 }; 3810 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3811 char __user *user_buf, size_t count, loff_t *ppos) 3812 { 3813 char *buff; 3814 int desc = 0; 3815 int i, j; 3816 ssize_t ret; 3817 struct iwl_scale_tbl_info *tbl; 3818 struct rs_rate *rate; 3819 struct iwl_lq_sta *lq_sta = file->private_data; 3820 3821 buff = kmalloc(1024, GFP_KERNEL); 3822 if (!buff) 3823 return -ENOMEM; 3824 3825 for (i = 0; i < LQ_SIZE; i++) { 3826 tbl = &(lq_sta->lq_info[i]); 3827 rate = &tbl->rate; 3828 desc += sprintf(buff+desc, 3829 "%s type=%d SGI=%d BW=%s DUP=0\n" 3830 "index=%d\n", 3831 lq_sta->active_tbl == i ? "*" : "x", 3832 rate->type, 3833 rate->sgi, 3834 is_ht20(rate) ? "20MHz" : 3835 is_ht40(rate) ? "40MHz" : 3836 is_ht80(rate) ? "80MHz" : 3837 is_ht160(rate) ? "160MHz" : "ERR", 3838 rate->index); 3839 for (j = 0; j < IWL_RATE_COUNT; j++) { 3840 desc += sprintf(buff+desc, 3841 "counter=%d success=%d %%=%d\n", 3842 tbl->win[j].counter, 3843 tbl->win[j].success_counter, 3844 tbl->win[j].success_ratio); 3845 } 3846 } 3847 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3848 kfree(buff); 3849 return ret; 3850 } 3851 3852 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3853 .read = rs_sta_dbgfs_stats_table_read, 3854 .open = simple_open, 3855 .llseek = default_llseek, 3856 }; 3857 3858 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3859 char __user *user_buf, 3860 size_t count, loff_t *ppos) 3861 { 3862 static const char * const column_name[] = { 3863 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3864 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3865 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3866 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3867 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3868 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3869 [RS_COLUMN_MIMO2] = "MIMO2", 3870 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3871 }; 3872 3873 static const char * const rate_name[] = { 3874 [IWL_RATE_1M_INDEX] = "1M", 3875 [IWL_RATE_2M_INDEX] = "2M", 3876 [IWL_RATE_5M_INDEX] = "5.5M", 3877 [IWL_RATE_11M_INDEX] = "11M", 3878 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3879 [IWL_RATE_9M_INDEX] = "9M", 3880 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3881 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3882 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3883 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3884 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3885 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3886 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3887 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3888 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3889 }; 3890 3891 char *buff, *pos, *endpos; 3892 int col, rate; 3893 ssize_t ret; 3894 struct iwl_lq_sta *lq_sta = file->private_data; 3895 struct rs_rate_stats *stats; 3896 static const size_t bufsz = 1024; 3897 3898 buff = kmalloc(bufsz, GFP_KERNEL); 3899 if (!buff) 3900 return -ENOMEM; 3901 3902 pos = buff; 3903 endpos = pos + bufsz; 3904 3905 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 3906 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 3907 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 3908 pos += scnprintf(pos, endpos - pos, "\n"); 3909 3910 for (col = 0; col < RS_COLUMN_COUNT; col++) { 3911 pos += scnprintf(pos, endpos - pos, 3912 "%s,", column_name[col]); 3913 3914 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 3915 stats = &(lq_sta->pers.tx_stats[col][rate]); 3916 pos += scnprintf(pos, endpos - pos, 3917 "%llu/%llu,", 3918 stats->success, 3919 stats->total); 3920 } 3921 pos += scnprintf(pos, endpos - pos, "\n"); 3922 } 3923 3924 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 3925 kfree(buff); 3926 return ret; 3927 } 3928 3929 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 3930 const char __user *user_buf, 3931 size_t count, loff_t *ppos) 3932 { 3933 struct iwl_lq_sta *lq_sta = file->private_data; 3934 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 3935 3936 return count; 3937 } 3938 3939 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 3940 .read = rs_sta_dbgfs_drv_tx_stats_read, 3941 .write = rs_sta_dbgfs_drv_tx_stats_write, 3942 .open = simple_open, 3943 .llseek = default_llseek, 3944 }; 3945 3946 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 3947 char __user *user_buf, 3948 size_t count, loff_t *ppos) 3949 { 3950 struct iwl_lq_sta *lq_sta = file->private_data; 3951 char buf[12]; 3952 int bufsz = sizeof(buf); 3953 int pos = 0; 3954 static const char * const ss_force_name[] = { 3955 [RS_SS_FORCE_NONE] = "none", 3956 [RS_SS_FORCE_STBC] = "stbc", 3957 [RS_SS_FORCE_BFER] = "bfer", 3958 [RS_SS_FORCE_SISO] = "siso", 3959 }; 3960 3961 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 3962 ss_force_name[lq_sta->pers.ss_force]); 3963 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 3964 } 3965 3966 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 3967 size_t count, loff_t *ppos) 3968 { 3969 struct iwl_mvm *mvm = lq_sta->pers.drv; 3970 int ret = 0; 3971 3972 if (!strncmp("none", buf, 4)) { 3973 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 3974 } else if (!strncmp("siso", buf, 4)) { 3975 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 3976 } else if (!strncmp("stbc", buf, 4)) { 3977 if (lq_sta->stbc_capable) { 3978 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 3979 } else { 3980 IWL_ERR(mvm, 3981 "can't force STBC. peer doesn't support\n"); 3982 ret = -EINVAL; 3983 } 3984 } else if (!strncmp("bfer", buf, 4)) { 3985 if (lq_sta->bfer_capable) { 3986 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 3987 } else { 3988 IWL_ERR(mvm, 3989 "can't force BFER. peer doesn't support\n"); 3990 ret = -EINVAL; 3991 } 3992 } else { 3993 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 3994 ret = -EINVAL; 3995 } 3996 return ret ?: count; 3997 } 3998 3999 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4000 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4001 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4002 if (!debugfs_create_file(#name, mode, parent, lq_sta, \ 4003 &iwl_dbgfs_##name##_ops)) \ 4004 goto err; \ 4005 } while (0) 4006 4007 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4008 4009 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4010 struct dentry *dir) 4011 { 4012 struct iwl_lq_sta *lq_sta = priv_sta; 4013 struct iwl_mvm_sta *mvmsta; 4014 4015 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4016 4017 if (!mvmsta->vif) 4018 return; 4019 4020 debugfs_create_file("rate_scale_table", 0600, dir, 4021 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4022 debugfs_create_file("rate_stats_table", 0400, dir, 4023 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4024 debugfs_create_file("drv_tx_stats", 0600, dir, 4025 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4026 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4027 &lq_sta->tx_agg_tid_en); 4028 debugfs_create_u8("reduced_tpc", 0600, dir, 4029 &lq_sta->pers.dbg_fixed_txp_reduction); 4030 4031 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4032 return; 4033 err: 4034 IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n"); 4035 } 4036 4037 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta) 4038 { 4039 } 4040 #endif 4041 4042 /* 4043 * Initialization of rate scaling information is done by driver after 4044 * the station is added. Since mac80211 calls this function before a 4045 * station is added we ignore it. 4046 */ 4047 static void rs_rate_init_ops(void *mvm_r, 4048 struct ieee80211_supported_band *sband, 4049 struct cfg80211_chan_def *chandef, 4050 struct ieee80211_sta *sta, void *mvm_sta) 4051 { 4052 } 4053 4054 /* ops for rate scaling implemented in the driver */ 4055 static const struct rate_control_ops rs_mvm_ops_drv = { 4056 .name = RS_NAME, 4057 .tx_status = rs_drv_mac80211_tx_status, 4058 .get_rate = rs_drv_get_rate, 4059 .rate_init = rs_rate_init_ops, 4060 .alloc = rs_alloc, 4061 .free = rs_free, 4062 .alloc_sta = rs_drv_alloc_sta, 4063 .free_sta = rs_free_sta, 4064 .rate_update = rs_drv_rate_update, 4065 #ifdef CONFIG_MAC80211_DEBUGFS 4066 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4067 .remove_sta_debugfs = rs_remove_sta_debugfs, 4068 #endif 4069 }; 4070 4071 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4072 enum nl80211_band band, bool init) 4073 { 4074 if (iwl_mvm_has_tlc_offload(mvm)) 4075 rs_fw_rate_init(mvm, sta, band); 4076 else 4077 rs_drv_rate_init(mvm, sta, band, init); 4078 } 4079 4080 int iwl_mvm_rate_control_register(void) 4081 { 4082 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4083 } 4084 4085 void iwl_mvm_rate_control_unregister(void) 4086 { 4087 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4088 } 4089 4090 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4091 bool enable) 4092 { 4093 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4094 4095 lockdep_assert_held(&mvm->mutex); 4096 4097 if (enable) { 4098 if (mvmsta->tx_protection == 0) 4099 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4100 mvmsta->tx_protection++; 4101 } else { 4102 mvmsta->tx_protection--; 4103 if (mvmsta->tx_protection == 0) 4104 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4105 } 4106 4107 return iwl_mvm_send_lq_cmd(mvm, lq, false); 4108 } 4109 4110 /** 4111 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4112 * @mvmsta: The station 4113 * @enable: Enable Tx protection? 4114 */ 4115 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4116 bool enable) 4117 { 4118 if (iwl_mvm_has_tlc_offload(mvm)) 4119 return rs_fw_tx_protection(mvm, mvmsta, enable); 4120 else 4121 return rs_drv_tx_protection(mvm, mvmsta, enable); 4122 } 4123