1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 7 * Copyright(c) 2018 - 2019 Intel Corporation 8 * 9 * Contact Information: 10 * Intel Linux Wireless <linuxwifi@intel.com> 11 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 12 * 13 *****************************************************************************/ 14 #include <linux/kernel.h> 15 #include <linux/skbuff.h> 16 #include <linux/slab.h> 17 #include <net/mac80211.h> 18 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/delay.h> 22 23 #include <linux/workqueue.h> 24 #include "rs.h" 25 #include "fw-api.h" 26 #include "sta.h" 27 #include "iwl-op-mode.h" 28 #include "mvm.h" 29 #include "debugfs.h" 30 31 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 32 33 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 34 * Use this macro when dealing with thresholds consts set as a percentage 35 */ 36 #define RS_PERCENT(x) (128 * x) 37 38 static u8 rs_ht_to_legacy[] = { 39 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 40 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 41 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 42 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 43 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 44 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 45 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 46 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 47 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 48 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 49 }; 50 51 static const u8 ant_toggle_lookup[] = { 52 [ANT_NONE] = ANT_NONE, 53 [ANT_A] = ANT_B, 54 [ANT_B] = ANT_A, 55 [ANT_AB] = ANT_AB, 56 }; 57 58 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 59 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 60 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 61 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 62 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 63 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 64 IWL_RATE_##rp##M_INDEX, \ 65 IWL_RATE_##rn##M_INDEX } 66 67 #define IWL_DECLARE_MCS_RATE(s) \ 68 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 69 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 70 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 71 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 72 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 73 IWL_RATE_INVM_INDEX, \ 74 IWL_RATE_INVM_INDEX } 75 76 /* 77 * Parameter order: 78 * rate, ht rate, prev rate, next rate 79 * 80 * If there isn't a valid next or previous rate then INV is used which 81 * maps to IWL_RATE_INVALID 82 * 83 */ 84 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 85 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 86 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 87 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 88 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 89 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 90 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 91 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 92 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 93 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 94 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 95 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 96 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 97 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 98 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 99 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 100 }; 101 102 enum rs_action { 103 RS_ACTION_STAY = 0, 104 RS_ACTION_DOWNSCALE = -1, 105 RS_ACTION_UPSCALE = 1, 106 }; 107 108 enum rs_column_mode { 109 RS_INVALID = 0, 110 RS_LEGACY, 111 RS_SISO, 112 RS_MIMO2, 113 }; 114 115 #define MAX_NEXT_COLUMNS 7 116 #define MAX_COLUMN_CHECKS 3 117 118 struct rs_tx_column; 119 120 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 121 struct ieee80211_sta *sta, 122 struct rs_rate *rate, 123 const struct rs_tx_column *next_col); 124 125 struct rs_tx_column { 126 enum rs_column_mode mode; 127 u8 ant; 128 bool sgi; 129 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 130 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 131 }; 132 133 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 134 struct rs_rate *rate, 135 const struct rs_tx_column *next_col) 136 { 137 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 138 } 139 140 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 141 struct rs_rate *rate, 142 const struct rs_tx_column *next_col) 143 { 144 if (!sta->ht_cap.ht_supported) 145 return false; 146 147 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 148 return false; 149 150 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 151 return false; 152 153 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 154 return false; 155 156 if (mvm->nvm_data->sku_cap_mimo_disabled) 157 return false; 158 159 return true; 160 } 161 162 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 163 struct rs_rate *rate, 164 const struct rs_tx_column *next_col) 165 { 166 if (!sta->ht_cap.ht_supported) 167 return false; 168 169 return true; 170 } 171 172 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 173 struct rs_rate *rate, 174 const struct rs_tx_column *next_col) 175 { 176 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 177 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 178 179 if (is_ht20(rate) && (ht_cap->cap & 180 IEEE80211_HT_CAP_SGI_20)) 181 return true; 182 if (is_ht40(rate) && (ht_cap->cap & 183 IEEE80211_HT_CAP_SGI_40)) 184 return true; 185 if (is_ht80(rate) && (vht_cap->cap & 186 IEEE80211_VHT_CAP_SHORT_GI_80)) 187 return true; 188 if (is_ht160(rate) && (vht_cap->cap & 189 IEEE80211_VHT_CAP_SHORT_GI_160)) 190 return true; 191 192 return false; 193 } 194 195 static const struct rs_tx_column rs_tx_columns[] = { 196 [RS_COLUMN_LEGACY_ANT_A] = { 197 .mode = RS_LEGACY, 198 .ant = ANT_A, 199 .next_columns = { 200 RS_COLUMN_LEGACY_ANT_B, 201 RS_COLUMN_SISO_ANT_A, 202 RS_COLUMN_MIMO2, 203 RS_COLUMN_INVALID, 204 RS_COLUMN_INVALID, 205 RS_COLUMN_INVALID, 206 RS_COLUMN_INVALID, 207 }, 208 .checks = { 209 rs_ant_allow, 210 }, 211 }, 212 [RS_COLUMN_LEGACY_ANT_B] = { 213 .mode = RS_LEGACY, 214 .ant = ANT_B, 215 .next_columns = { 216 RS_COLUMN_LEGACY_ANT_A, 217 RS_COLUMN_SISO_ANT_B, 218 RS_COLUMN_MIMO2, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 RS_COLUMN_INVALID, 222 RS_COLUMN_INVALID, 223 }, 224 .checks = { 225 rs_ant_allow, 226 }, 227 }, 228 [RS_COLUMN_SISO_ANT_A] = { 229 .mode = RS_SISO, 230 .ant = ANT_A, 231 .next_columns = { 232 RS_COLUMN_SISO_ANT_B, 233 RS_COLUMN_MIMO2, 234 RS_COLUMN_SISO_ANT_A_SGI, 235 RS_COLUMN_LEGACY_ANT_A, 236 RS_COLUMN_LEGACY_ANT_B, 237 RS_COLUMN_INVALID, 238 RS_COLUMN_INVALID, 239 }, 240 .checks = { 241 rs_siso_allow, 242 rs_ant_allow, 243 }, 244 }, 245 [RS_COLUMN_SISO_ANT_B] = { 246 .mode = RS_SISO, 247 .ant = ANT_B, 248 .next_columns = { 249 RS_COLUMN_SISO_ANT_A, 250 RS_COLUMN_MIMO2, 251 RS_COLUMN_SISO_ANT_B_SGI, 252 RS_COLUMN_LEGACY_ANT_A, 253 RS_COLUMN_LEGACY_ANT_B, 254 RS_COLUMN_INVALID, 255 RS_COLUMN_INVALID, 256 }, 257 .checks = { 258 rs_siso_allow, 259 rs_ant_allow, 260 }, 261 }, 262 [RS_COLUMN_SISO_ANT_A_SGI] = { 263 .mode = RS_SISO, 264 .ant = ANT_A, 265 .sgi = true, 266 .next_columns = { 267 RS_COLUMN_SISO_ANT_B_SGI, 268 RS_COLUMN_MIMO2_SGI, 269 RS_COLUMN_SISO_ANT_A, 270 RS_COLUMN_LEGACY_ANT_A, 271 RS_COLUMN_LEGACY_ANT_B, 272 RS_COLUMN_INVALID, 273 RS_COLUMN_INVALID, 274 }, 275 .checks = { 276 rs_siso_allow, 277 rs_ant_allow, 278 rs_sgi_allow, 279 }, 280 }, 281 [RS_COLUMN_SISO_ANT_B_SGI] = { 282 .mode = RS_SISO, 283 .ant = ANT_B, 284 .sgi = true, 285 .next_columns = { 286 RS_COLUMN_SISO_ANT_A_SGI, 287 RS_COLUMN_MIMO2_SGI, 288 RS_COLUMN_SISO_ANT_B, 289 RS_COLUMN_LEGACY_ANT_A, 290 RS_COLUMN_LEGACY_ANT_B, 291 RS_COLUMN_INVALID, 292 RS_COLUMN_INVALID, 293 }, 294 .checks = { 295 rs_siso_allow, 296 rs_ant_allow, 297 rs_sgi_allow, 298 }, 299 }, 300 [RS_COLUMN_MIMO2] = { 301 .mode = RS_MIMO2, 302 .ant = ANT_AB, 303 .next_columns = { 304 RS_COLUMN_SISO_ANT_A, 305 RS_COLUMN_MIMO2_SGI, 306 RS_COLUMN_LEGACY_ANT_A, 307 RS_COLUMN_LEGACY_ANT_B, 308 RS_COLUMN_INVALID, 309 RS_COLUMN_INVALID, 310 RS_COLUMN_INVALID, 311 }, 312 .checks = { 313 rs_mimo_allow, 314 }, 315 }, 316 [RS_COLUMN_MIMO2_SGI] = { 317 .mode = RS_MIMO2, 318 .ant = ANT_AB, 319 .sgi = true, 320 .next_columns = { 321 RS_COLUMN_SISO_ANT_A_SGI, 322 RS_COLUMN_MIMO2, 323 RS_COLUMN_LEGACY_ANT_A, 324 RS_COLUMN_LEGACY_ANT_B, 325 RS_COLUMN_INVALID, 326 RS_COLUMN_INVALID, 327 RS_COLUMN_INVALID, 328 }, 329 .checks = { 330 rs_mimo_allow, 331 rs_sgi_allow, 332 }, 333 }, 334 }; 335 336 static inline u8 rs_extract_rate(u32 rate_n_flags) 337 { 338 /* also works for HT because bits 7:6 are zero there */ 339 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 340 } 341 342 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 343 { 344 int idx = 0; 345 346 if (rate_n_flags & RATE_MCS_HT_MSK) { 347 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 348 idx += IWL_RATE_MCS_0_INDEX; 349 350 /* skip 9M not supported in HT*/ 351 if (idx >= IWL_RATE_9M_INDEX) 352 idx += 1; 353 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 354 return idx; 355 } else if (rate_n_flags & RATE_MCS_VHT_MSK || 356 rate_n_flags & RATE_MCS_HE_MSK) { 357 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 358 idx += IWL_RATE_MCS_0_INDEX; 359 360 /* skip 9M not supported in VHT*/ 361 if (idx >= IWL_RATE_9M_INDEX) 362 idx++; 363 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 364 return idx; 365 if ((rate_n_flags & RATE_MCS_HE_MSK) && 366 (idx <= IWL_LAST_HE_RATE)) 367 return idx; 368 } else { 369 /* legacy rate format, search for match in table */ 370 371 u8 legacy_rate = rs_extract_rate(rate_n_flags); 372 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 373 if (iwl_rates[idx].plcp == legacy_rate) 374 return idx; 375 } 376 377 return IWL_RATE_INVALID; 378 } 379 380 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 381 struct ieee80211_sta *sta, 382 struct iwl_lq_sta *lq_sta, 383 int tid, bool ndp); 384 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 385 struct ieee80211_sta *sta, 386 struct iwl_lq_sta *lq_sta, 387 const struct rs_rate *initial_rate); 388 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 389 390 /** 391 * The following tables contain the expected throughput metrics for all rates 392 * 393 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 394 * 395 * where invalid entries are zeros. 396 * 397 * CCK rates are only valid in legacy table and will only be used in G 398 * (2.4 GHz) band. 399 */ 400 401 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 402 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 403 }; 404 405 /* Expected TpT tables. 4 indexes: 406 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 407 */ 408 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 409 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 410 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 411 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 412 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 413 }; 414 415 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 416 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 417 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 418 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 419 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 420 }; 421 422 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 423 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 424 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 425 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 426 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 427 }; 428 429 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 430 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 431 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 432 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 433 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 434 }; 435 436 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 437 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 438 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 439 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 440 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 441 }; 442 443 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 444 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 445 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 446 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 447 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 448 }; 449 450 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 451 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 452 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 453 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 454 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 455 }; 456 457 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 458 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 459 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 460 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 461 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 462 }; 463 464 /* mbps, mcs */ 465 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 466 { "1", "BPSK DSSS"}, 467 { "2", "QPSK DSSS"}, 468 {"5.5", "BPSK CCK"}, 469 { "11", "QPSK CCK"}, 470 { "6", "BPSK 1/2"}, 471 { "9", "BPSK 1/2"}, 472 { "12", "QPSK 1/2"}, 473 { "18", "QPSK 3/4"}, 474 { "24", "16QAM 1/2"}, 475 { "36", "16QAM 3/4"}, 476 { "48", "64QAM 2/3"}, 477 { "54", "64QAM 3/4"}, 478 { "60", "64QAM 5/6"}, 479 }; 480 481 #define MCS_INDEX_PER_STREAM (8) 482 483 static const char *rs_pretty_ant(u8 ant) 484 { 485 static const char * const ant_name[] = { 486 [ANT_NONE] = "None", 487 [ANT_A] = "A", 488 [ANT_B] = "B", 489 [ANT_AB] = "AB", 490 [ANT_C] = "C", 491 [ANT_AC] = "AC", 492 [ANT_BC] = "BC", 493 [ANT_ABC] = "ABC", 494 }; 495 496 if (ant > ANT_ABC) 497 return "UNKNOWN"; 498 499 return ant_name[ant]; 500 } 501 502 static const char *rs_pretty_lq_type(enum iwl_table_type type) 503 { 504 static const char * const lq_types[] = { 505 [LQ_NONE] = "NONE", 506 [LQ_LEGACY_A] = "LEGACY_A", 507 [LQ_LEGACY_G] = "LEGACY_G", 508 [LQ_HT_SISO] = "HT SISO", 509 [LQ_HT_MIMO2] = "HT MIMO", 510 [LQ_VHT_SISO] = "VHT SISO", 511 [LQ_VHT_MIMO2] = "VHT MIMO", 512 [LQ_HE_SISO] = "HE SISO", 513 [LQ_HE_MIMO2] = "HE MIMO", 514 }; 515 516 if (type < LQ_NONE || type >= LQ_MAX) 517 return "UNKNOWN"; 518 519 return lq_types[type]; 520 } 521 522 static char *rs_pretty_rate(const struct rs_rate *rate) 523 { 524 static char buf[40]; 525 static const char * const legacy_rates[] = { 526 [IWL_RATE_1M_INDEX] = "1M", 527 [IWL_RATE_2M_INDEX] = "2M", 528 [IWL_RATE_5M_INDEX] = "5.5M", 529 [IWL_RATE_11M_INDEX] = "11M", 530 [IWL_RATE_6M_INDEX] = "6M", 531 [IWL_RATE_9M_INDEX] = "9M", 532 [IWL_RATE_12M_INDEX] = "12M", 533 [IWL_RATE_18M_INDEX] = "18M", 534 [IWL_RATE_24M_INDEX] = "24M", 535 [IWL_RATE_36M_INDEX] = "36M", 536 [IWL_RATE_48M_INDEX] = "48M", 537 [IWL_RATE_54M_INDEX] = "54M", 538 }; 539 static const char *const ht_vht_rates[] = { 540 [IWL_RATE_MCS_0_INDEX] = "MCS0", 541 [IWL_RATE_MCS_1_INDEX] = "MCS1", 542 [IWL_RATE_MCS_2_INDEX] = "MCS2", 543 [IWL_RATE_MCS_3_INDEX] = "MCS3", 544 [IWL_RATE_MCS_4_INDEX] = "MCS4", 545 [IWL_RATE_MCS_5_INDEX] = "MCS5", 546 [IWL_RATE_MCS_6_INDEX] = "MCS6", 547 [IWL_RATE_MCS_7_INDEX] = "MCS7", 548 [IWL_RATE_MCS_8_INDEX] = "MCS8", 549 [IWL_RATE_MCS_9_INDEX] = "MCS9", 550 }; 551 const char *rate_str; 552 553 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 554 rate_str = legacy_rates[rate->index]; 555 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 556 (rate->index >= IWL_RATE_MCS_0_INDEX) && 557 (rate->index <= IWL_RATE_MCS_9_INDEX)) 558 rate_str = ht_vht_rates[rate->index]; 559 else 560 rate_str = "BAD_RATE"; 561 562 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 563 rs_pretty_ant(rate->ant), rate_str); 564 return buf; 565 } 566 567 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 568 const char *prefix) 569 { 570 IWL_DEBUG_RATE(mvm, 571 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 572 prefix, rs_pretty_rate(rate), rate->bw, 573 rate->sgi, rate->ldpc, rate->stbc); 574 } 575 576 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 577 { 578 window->data = 0; 579 window->success_counter = 0; 580 window->success_ratio = IWL_INVALID_VALUE; 581 window->counter = 0; 582 window->average_tpt = IWL_INVALID_VALUE; 583 } 584 585 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 586 struct iwl_scale_tbl_info *tbl) 587 { 588 int i; 589 590 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 591 for (i = 0; i < IWL_RATE_COUNT; i++) 592 rs_rate_scale_clear_window(&tbl->win[i]); 593 594 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 595 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 596 } 597 598 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 599 { 600 return (ant_type & valid_antenna) == ant_type; 601 } 602 603 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 604 struct iwl_lq_sta *lq_data, u8 tid, 605 struct ieee80211_sta *sta) 606 { 607 int ret = -EAGAIN; 608 609 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 610 sta->addr, tid); 611 612 /* start BA session until the peer sends del BA */ 613 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 614 if (ret == -EAGAIN) { 615 /* 616 * driver and mac80211 is out of sync 617 * this might be cause by reloading firmware 618 * stop the tx ba session here 619 */ 620 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 621 tid); 622 ieee80211_stop_tx_ba_session(sta, tid); 623 } 624 return ret; 625 } 626 627 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 628 u8 tid, struct iwl_lq_sta *lq_sta, 629 struct ieee80211_sta *sta) 630 { 631 struct iwl_mvm_tid_data *tid_data; 632 633 /* 634 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 635 * when the frame is not QoS 636 */ 637 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 638 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 639 tid, IWL_MAX_TID_COUNT); 640 return; 641 } else if (tid == IWL_MAX_TID_COUNT) { 642 return; 643 } 644 645 tid_data = &mvmsta->tid_data[tid]; 646 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 647 tid_data->state == IWL_AGG_OFF && 648 (lq_sta->tx_agg_tid_en & BIT(tid)) && 649 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 650 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 651 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 652 tid_data->state = IWL_AGG_QUEUED; 653 } 654 } 655 656 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 657 { 658 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 659 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 660 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 661 } 662 663 /* 664 * Static function to get the expected throughput from an iwl_scale_tbl_info 665 * that wraps a NULL pointer check 666 */ 667 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 668 { 669 if (tbl->expected_tpt) 670 return tbl->expected_tpt[rs_index]; 671 return 0; 672 } 673 674 /** 675 * rs_collect_tx_data - Update the success/failure sliding window 676 * 677 * We keep a sliding window of the last 62 packets transmitted 678 * at this rate. window->data contains the bitmask of successful 679 * packets. 680 */ 681 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 682 struct iwl_scale_tbl_info *tbl, 683 int scale_index, int attempts, int successes, 684 struct iwl_rate_scale_data *window) 685 { 686 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 687 s32 fail_count, tpt; 688 689 /* Get expected throughput */ 690 tpt = get_expected_tpt(tbl, scale_index); 691 692 /* 693 * Keep track of only the latest 62 tx frame attempts in this rate's 694 * history window; anything older isn't really relevant any more. 695 * If we have filled up the sliding window, drop the oldest attempt; 696 * if the oldest attempt (highest bit in bitmap) shows "success", 697 * subtract "1" from the success counter (this is the main reason 698 * we keep these bitmaps!). 699 */ 700 while (attempts > 0) { 701 if (window->counter >= IWL_RATE_MAX_WINDOW) { 702 /* remove earliest */ 703 window->counter = IWL_RATE_MAX_WINDOW - 1; 704 705 if (window->data & mask) { 706 window->data &= ~mask; 707 window->success_counter--; 708 } 709 } 710 711 /* Increment frames-attempted counter */ 712 window->counter++; 713 714 /* Shift bitmap by one frame to throw away oldest history */ 715 window->data <<= 1; 716 717 /* Mark the most recent #successes attempts as successful */ 718 if (successes > 0) { 719 window->success_counter++; 720 window->data |= 0x1; 721 successes--; 722 } 723 724 attempts--; 725 } 726 727 /* Calculate current success ratio, avoid divide-by-0! */ 728 if (window->counter > 0) 729 window->success_ratio = 128 * (100 * window->success_counter) 730 / window->counter; 731 else 732 window->success_ratio = IWL_INVALID_VALUE; 733 734 fail_count = window->counter - window->success_counter; 735 736 /* Calculate average throughput, if we have enough history. */ 737 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 738 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 739 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 740 else 741 window->average_tpt = IWL_INVALID_VALUE; 742 743 return 0; 744 } 745 746 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 747 struct iwl_lq_sta *lq_sta, 748 struct iwl_scale_tbl_info *tbl, 749 int scale_index, int attempts, int successes, 750 u8 reduced_txp) 751 { 752 struct iwl_rate_scale_data *window = NULL; 753 754 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 755 return -EINVAL; 756 757 window = &tbl->tpc_win[reduced_txp]; 758 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 759 window); 760 } 761 762 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 763 struct iwl_mvm_sta *mvmsta, 764 u8 tid, int successes) 765 { 766 struct iwl_mvm_tid_data *tid_data; 767 768 if (tid >= IWL_MAX_TID_COUNT) 769 return; 770 771 tid_data = &mvmsta->tid_data[tid]; 772 773 /* 774 * Measure if there're enough successful transmits per second. 775 * These statistics are used only to decide if we can start a 776 * BA session, so it should be updated only when A-MPDU is 777 * off. 778 */ 779 if (tid_data->state != IWL_AGG_OFF) 780 return; 781 782 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 783 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 784 tid_data->tx_count_last = tid_data->tx_count; 785 tid_data->tx_count = 0; 786 tid_data->tpt_meas_start = jiffies; 787 } else { 788 tid_data->tx_count += successes; 789 } 790 } 791 792 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 793 struct iwl_mvm_sta *mvmsta, u8 tid, 794 struct iwl_scale_tbl_info *tbl, 795 int scale_index, int attempts, int successes) 796 { 797 struct iwl_rate_scale_data *window = NULL; 798 799 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 800 return -EINVAL; 801 802 if (tbl->column != RS_COLUMN_INVALID) { 803 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 804 805 pers->tx_stats[tbl->column][scale_index].total += attempts; 806 pers->tx_stats[tbl->column][scale_index].success += successes; 807 } 808 809 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 810 811 /* Select window for current tx bit rate */ 812 window = &(tbl->win[scale_index]); 813 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 814 window); 815 } 816 817 /* Convert rs_rate object into ucode rate bitmask */ 818 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 819 struct rs_rate *rate) 820 { 821 u32 ucode_rate = 0; 822 int index = rate->index; 823 824 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 825 RATE_MCS_ANT_ABC_MSK); 826 827 if (is_legacy(rate)) { 828 ucode_rate |= iwl_rates[index].plcp; 829 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 830 ucode_rate |= RATE_MCS_CCK_MSK; 831 return ucode_rate; 832 } 833 834 if (is_ht(rate)) { 835 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 836 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 837 index = IWL_LAST_HT_RATE; 838 } 839 ucode_rate |= RATE_MCS_HT_MSK; 840 841 if (is_ht_siso(rate)) 842 ucode_rate |= iwl_rates[index].plcp_ht_siso; 843 else if (is_ht_mimo2(rate)) 844 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 845 else 846 WARN_ON_ONCE(1); 847 } else if (is_vht(rate)) { 848 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 849 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 850 index = IWL_LAST_VHT_RATE; 851 } 852 ucode_rate |= RATE_MCS_VHT_MSK; 853 if (is_vht_siso(rate)) 854 ucode_rate |= iwl_rates[index].plcp_vht_siso; 855 else if (is_vht_mimo2(rate)) 856 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 857 else 858 WARN_ON_ONCE(1); 859 860 } else { 861 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 862 } 863 864 if (is_siso(rate) && rate->stbc) { 865 /* To enable STBC we need to set both a flag and ANT_AB */ 866 ucode_rate |= RATE_MCS_ANT_AB_MSK; 867 ucode_rate |= RATE_MCS_STBC_MSK; 868 } 869 870 ucode_rate |= rate->bw; 871 if (rate->sgi) 872 ucode_rate |= RATE_MCS_SGI_MSK; 873 if (rate->ldpc) 874 ucode_rate |= RATE_MCS_LDPC_MSK; 875 876 return ucode_rate; 877 } 878 879 /* Convert a ucode rate into an rs_rate object */ 880 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 881 enum nl80211_band band, 882 struct rs_rate *rate) 883 { 884 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 885 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 886 u8 nss; 887 888 memset(rate, 0, sizeof(*rate)); 889 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 890 891 if (rate->index == IWL_RATE_INVALID) 892 return -EINVAL; 893 894 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 895 896 /* Legacy */ 897 if (!(ucode_rate & RATE_MCS_HT_MSK) && 898 !(ucode_rate & RATE_MCS_VHT_MSK) && 899 !(ucode_rate & RATE_MCS_HE_MSK)) { 900 if (num_of_ant == 1) { 901 if (band == NL80211_BAND_5GHZ) 902 rate->type = LQ_LEGACY_A; 903 else 904 rate->type = LQ_LEGACY_G; 905 } 906 907 return 0; 908 } 909 910 /* HT, VHT or HE */ 911 if (ucode_rate & RATE_MCS_SGI_MSK) 912 rate->sgi = true; 913 if (ucode_rate & RATE_MCS_LDPC_MSK) 914 rate->ldpc = true; 915 if (ucode_rate & RATE_MCS_STBC_MSK) 916 rate->stbc = true; 917 if (ucode_rate & RATE_MCS_BF_MSK) 918 rate->bfer = true; 919 920 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 921 922 if (ucode_rate & RATE_MCS_HT_MSK) { 923 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 924 RATE_HT_MCS_NSS_POS) + 1; 925 926 if (nss == 1) { 927 rate->type = LQ_HT_SISO; 928 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 929 "stbc %d bfer %d", 930 rate->stbc, rate->bfer); 931 } else if (nss == 2) { 932 rate->type = LQ_HT_MIMO2; 933 WARN_ON_ONCE(num_of_ant != 2); 934 } else { 935 WARN_ON_ONCE(1); 936 } 937 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 938 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 939 RATE_VHT_MCS_NSS_POS) + 1; 940 941 if (nss == 1) { 942 rate->type = LQ_VHT_SISO; 943 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 944 "stbc %d bfer %d", 945 rate->stbc, rate->bfer); 946 } else if (nss == 2) { 947 rate->type = LQ_VHT_MIMO2; 948 WARN_ON_ONCE(num_of_ant != 2); 949 } else { 950 WARN_ON_ONCE(1); 951 } 952 } else if (ucode_rate & RATE_MCS_HE_MSK) { 953 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 954 RATE_VHT_MCS_NSS_POS) + 1; 955 956 if (nss == 1) { 957 rate->type = LQ_HE_SISO; 958 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 959 "stbc %d bfer %d", rate->stbc, rate->bfer); 960 } else if (nss == 2) { 961 rate->type = LQ_HE_MIMO2; 962 WARN_ON_ONCE(num_of_ant != 2); 963 } else { 964 WARN_ON_ONCE(1); 965 } 966 } 967 968 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 969 !is_he(rate) && !is_vht(rate)); 970 971 return 0; 972 } 973 974 /* switch to another antenna/antennas and return 1 */ 975 /* if no other valid antenna found, return 0 */ 976 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 977 { 978 u8 new_ant_type; 979 980 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 981 return 0; 982 983 if (!rs_is_valid_ant(valid_ant, rate->ant)) 984 return 0; 985 986 new_ant_type = ant_toggle_lookup[rate->ant]; 987 988 while ((new_ant_type != rate->ant) && 989 !rs_is_valid_ant(valid_ant, new_ant_type)) 990 new_ant_type = ant_toggle_lookup[new_ant_type]; 991 992 if (new_ant_type == rate->ant) 993 return 0; 994 995 rate->ant = new_ant_type; 996 997 return 1; 998 } 999 1000 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 1001 struct rs_rate *rate) 1002 { 1003 if (is_legacy(rate)) 1004 return lq_sta->active_legacy_rate; 1005 else if (is_siso(rate)) 1006 return lq_sta->active_siso_rate; 1007 else if (is_mimo2(rate)) 1008 return lq_sta->active_mimo2_rate; 1009 1010 WARN_ON_ONCE(1); 1011 return 0; 1012 } 1013 1014 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1015 int rate_type) 1016 { 1017 u8 high = IWL_RATE_INVALID; 1018 u8 low = IWL_RATE_INVALID; 1019 1020 /* 802.11A or ht walks to the next literal adjacent rate in 1021 * the rate table */ 1022 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1023 int i; 1024 u32 mask; 1025 1026 /* Find the previous rate that is in the rate mask */ 1027 i = index - 1; 1028 if (i >= 0) 1029 mask = BIT(i); 1030 for (; i >= 0; i--, mask >>= 1) { 1031 if (rate_mask & mask) { 1032 low = i; 1033 break; 1034 } 1035 } 1036 1037 /* Find the next rate that is in the rate mask */ 1038 i = index + 1; 1039 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1040 if (rate_mask & mask) { 1041 high = i; 1042 break; 1043 } 1044 } 1045 1046 return (high << 8) | low; 1047 } 1048 1049 low = index; 1050 while (low != IWL_RATE_INVALID) { 1051 low = iwl_rates[low].prev_rs; 1052 if (low == IWL_RATE_INVALID) 1053 break; 1054 if (rate_mask & (1 << low)) 1055 break; 1056 } 1057 1058 high = index; 1059 while (high != IWL_RATE_INVALID) { 1060 high = iwl_rates[high].next_rs; 1061 if (high == IWL_RATE_INVALID) 1062 break; 1063 if (rate_mask & (1 << high)) 1064 break; 1065 } 1066 1067 return (high << 8) | low; 1068 } 1069 1070 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1071 struct rs_rate *rate) 1072 { 1073 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1074 } 1075 1076 /* Get the next supported lower rate in the current column. 1077 * Return true if bottom rate in the current column was reached 1078 */ 1079 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1080 struct rs_rate *rate) 1081 { 1082 u8 low; 1083 u16 high_low; 1084 u16 rate_mask; 1085 struct iwl_mvm *mvm = lq_sta->pers.drv; 1086 1087 rate_mask = rs_get_supported_rates(lq_sta, rate); 1088 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1089 rate->type); 1090 low = high_low & 0xff; 1091 1092 /* Bottom rate of column reached */ 1093 if (low == IWL_RATE_INVALID) 1094 return true; 1095 1096 rate->index = low; 1097 return false; 1098 } 1099 1100 /* Get the next rate to use following a column downgrade */ 1101 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1102 struct rs_rate *rate) 1103 { 1104 struct iwl_mvm *mvm = lq_sta->pers.drv; 1105 1106 if (is_legacy(rate)) { 1107 /* No column to downgrade from Legacy */ 1108 return; 1109 } else if (is_siso(rate)) { 1110 /* Downgrade to Legacy if we were in SISO */ 1111 if (lq_sta->band == NL80211_BAND_5GHZ) 1112 rate->type = LQ_LEGACY_A; 1113 else 1114 rate->type = LQ_LEGACY_G; 1115 1116 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1117 1118 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1119 rate->index > IWL_RATE_MCS_9_INDEX); 1120 1121 rate->index = rs_ht_to_legacy[rate->index]; 1122 rate->ldpc = false; 1123 } else { 1124 /* Downgrade to SISO with same MCS if in MIMO */ 1125 rate->type = is_vht_mimo2(rate) ? 1126 LQ_VHT_SISO : LQ_HT_SISO; 1127 } 1128 1129 if (num_of_ant(rate->ant) > 1) 1130 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1131 1132 /* Relevant in both switching to SISO or Legacy */ 1133 rate->sgi = false; 1134 1135 if (!rs_rate_supported(lq_sta, rate)) 1136 rs_get_lower_rate_in_column(lq_sta, rate); 1137 } 1138 1139 /* Check if both rates share the same column */ 1140 static inline bool rs_rate_column_match(struct rs_rate *a, 1141 struct rs_rate *b) 1142 { 1143 bool ant_match; 1144 1145 if (a->stbc || a->bfer) 1146 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1147 else 1148 ant_match = (a->ant == b->ant); 1149 1150 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1151 && ant_match; 1152 } 1153 1154 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1155 { 1156 if (is_legacy(rate)) { 1157 if (rate->ant == ANT_A) 1158 return RS_COLUMN_LEGACY_ANT_A; 1159 1160 if (rate->ant == ANT_B) 1161 return RS_COLUMN_LEGACY_ANT_B; 1162 1163 goto err; 1164 } 1165 1166 if (is_siso(rate)) { 1167 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1168 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1169 RS_COLUMN_SISO_ANT_A; 1170 1171 if (rate->ant == ANT_B) 1172 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1173 RS_COLUMN_SISO_ANT_B; 1174 1175 goto err; 1176 } 1177 1178 if (is_mimo(rate)) 1179 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1180 1181 err: 1182 return RS_COLUMN_INVALID; 1183 } 1184 1185 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1186 { 1187 u8 tid = IWL_MAX_TID_COUNT; 1188 1189 if (ieee80211_is_data_qos(hdr->frame_control)) { 1190 u8 *qc = ieee80211_get_qos_ctl(hdr); 1191 tid = qc[0] & 0xf; 1192 } 1193 1194 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1195 tid = IWL_MAX_TID_COUNT; 1196 1197 return tid; 1198 } 1199 1200 /* 1201 * mac80211 sends us Tx status 1202 */ 1203 static void rs_drv_mac80211_tx_status(void *mvm_r, 1204 struct ieee80211_supported_band *sband, 1205 struct ieee80211_sta *sta, void *priv_sta, 1206 struct sk_buff *skb) 1207 { 1208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1209 struct iwl_op_mode *op_mode = mvm_r; 1210 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1212 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1213 1214 if (!mvmsta->vif) 1215 return; 1216 1217 if (!ieee80211_is_data(hdr->frame_control) || 1218 info->flags & IEEE80211_TX_CTL_NO_ACK) 1219 return; 1220 1221 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1222 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1223 } 1224 1225 /* 1226 * Begin a period of staying with a selected modulation mode. 1227 * Set "stay_in_tbl" flag to prevent any mode switches. 1228 * Set frame tx success limits according to legacy vs. high-throughput, 1229 * and reset overall (spanning all rates) tx success history statistics. 1230 * These control how long we stay using same modulation mode before 1231 * searching for a new mode. 1232 */ 1233 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1234 struct iwl_lq_sta *lq_sta) 1235 { 1236 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1237 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1238 if (is_legacy) { 1239 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1240 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1241 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1242 } else { 1243 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1244 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1245 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1246 } 1247 lq_sta->table_count = 0; 1248 lq_sta->total_failed = 0; 1249 lq_sta->total_success = 0; 1250 lq_sta->flush_timer = jiffies; 1251 lq_sta->visited_columns = 0; 1252 } 1253 1254 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1255 { 1256 if (rate_mask) 1257 return find_last_bit(&rate_mask, BITS_PER_LONG); 1258 return IWL_RATE_INVALID; 1259 } 1260 1261 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1262 const struct rs_tx_column *column) 1263 { 1264 switch (column->mode) { 1265 case RS_LEGACY: 1266 return lq_sta->max_legacy_rate_idx; 1267 case RS_SISO: 1268 return lq_sta->max_siso_rate_idx; 1269 case RS_MIMO2: 1270 return lq_sta->max_mimo2_rate_idx; 1271 default: 1272 WARN_ON_ONCE(1); 1273 } 1274 1275 return lq_sta->max_legacy_rate_idx; 1276 } 1277 1278 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1279 const struct rs_tx_column *column, 1280 u32 bw) 1281 { 1282 /* Used to choose among HT tables */ 1283 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1284 1285 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1286 column->mode != RS_SISO && 1287 column->mode != RS_MIMO2)) 1288 return expected_tpt_legacy; 1289 1290 /* Legacy rates have only one table */ 1291 if (column->mode == RS_LEGACY) 1292 return expected_tpt_legacy; 1293 1294 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1295 /* Choose among many HT tables depending on number of streams 1296 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1297 * status */ 1298 if (column->mode == RS_SISO) { 1299 switch (bw) { 1300 case RATE_MCS_CHAN_WIDTH_20: 1301 ht_tbl_pointer = expected_tpt_siso_20MHz; 1302 break; 1303 case RATE_MCS_CHAN_WIDTH_40: 1304 ht_tbl_pointer = expected_tpt_siso_40MHz; 1305 break; 1306 case RATE_MCS_CHAN_WIDTH_80: 1307 ht_tbl_pointer = expected_tpt_siso_80MHz; 1308 break; 1309 case RATE_MCS_CHAN_WIDTH_160: 1310 ht_tbl_pointer = expected_tpt_siso_160MHz; 1311 break; 1312 default: 1313 WARN_ON_ONCE(1); 1314 } 1315 } else if (column->mode == RS_MIMO2) { 1316 switch (bw) { 1317 case RATE_MCS_CHAN_WIDTH_20: 1318 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1319 break; 1320 case RATE_MCS_CHAN_WIDTH_40: 1321 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1322 break; 1323 case RATE_MCS_CHAN_WIDTH_80: 1324 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1325 break; 1326 case RATE_MCS_CHAN_WIDTH_160: 1327 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1328 break; 1329 default: 1330 WARN_ON_ONCE(1); 1331 } 1332 } else { 1333 WARN_ON_ONCE(1); 1334 } 1335 1336 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1337 return ht_tbl_pointer[0]; 1338 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1339 return ht_tbl_pointer[1]; 1340 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1341 return ht_tbl_pointer[2]; 1342 else /* AGG+SGI */ 1343 return ht_tbl_pointer[3]; 1344 } 1345 1346 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1347 struct iwl_scale_tbl_info *tbl) 1348 { 1349 struct rs_rate *rate = &tbl->rate; 1350 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1351 1352 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1353 } 1354 1355 /* rs uses two tables, one is active and the second is for searching better 1356 * configuration. This function, according to the index of the currently 1357 * active table returns the search table, which is located at the 1358 * index complementary to 1 according to the active table (active = 1, 1359 * search = 0 or active = 0, search = 1). 1360 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds. 1361 */ 1362 static inline u8 rs_search_tbl(u8 active_tbl) 1363 { 1364 return (active_tbl ^ 1) & 1; 1365 } 1366 1367 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1368 struct iwl_lq_sta *lq_sta, 1369 struct iwl_scale_tbl_info *tbl, /* "search" */ 1370 unsigned long rate_mask, s8 index) 1371 { 1372 struct iwl_scale_tbl_info *active_tbl = 1373 &(lq_sta->lq_info[lq_sta->active_tbl]); 1374 s32 success_ratio = active_tbl->win[index].success_ratio; 1375 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1376 const u16 *tpt_tbl = tbl->expected_tpt; 1377 u16 high_low; 1378 u32 target_tpt; 1379 int rate_idx; 1380 1381 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1382 target_tpt = 100 * expected_current_tpt; 1383 IWL_DEBUG_RATE(mvm, 1384 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1385 success_ratio, target_tpt); 1386 } else { 1387 target_tpt = lq_sta->last_tpt; 1388 IWL_DEBUG_RATE(mvm, 1389 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1390 success_ratio, target_tpt); 1391 } 1392 1393 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1394 1395 while (rate_idx != IWL_RATE_INVALID) { 1396 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1397 break; 1398 1399 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1400 tbl->rate.type); 1401 1402 rate_idx = (high_low >> 8) & 0xff; 1403 } 1404 1405 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1406 rate_idx, target_tpt, 1407 rate_idx != IWL_RATE_INVALID ? 1408 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1409 1410 return rate_idx; 1411 } 1412 1413 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1414 { 1415 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1416 struct ieee80211_vht_cap vht_cap = { 1417 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1418 .supp_mcs = sta_vht_cap->vht_mcs, 1419 }; 1420 1421 switch (sta->bandwidth) { 1422 case IEEE80211_STA_RX_BW_160: 1423 /* 1424 * Don't use 160 MHz if VHT extended NSS support 1425 * says we cannot use 2 streams, we don't want to 1426 * deal with this. 1427 * We only check MCS 0 - they will support that if 1428 * we got here at all and we don't care which MCS, 1429 * we want to determine a more global state. 1430 */ 1431 if (ieee80211_get_vht_max_nss(&vht_cap, 1432 IEEE80211_VHT_CHANWIDTH_160MHZ, 1433 0, true) < sta->rx_nss) 1434 return RATE_MCS_CHAN_WIDTH_80; 1435 return RATE_MCS_CHAN_WIDTH_160; 1436 case IEEE80211_STA_RX_BW_80: 1437 return RATE_MCS_CHAN_WIDTH_80; 1438 case IEEE80211_STA_RX_BW_40: 1439 return RATE_MCS_CHAN_WIDTH_40; 1440 case IEEE80211_STA_RX_BW_20: 1441 default: 1442 return RATE_MCS_CHAN_WIDTH_20; 1443 } 1444 } 1445 1446 /* 1447 * Check whether we should continue using same modulation mode, or 1448 * begin search for a new mode, based on: 1449 * 1) # tx successes or failures while using this mode 1450 * 2) # times calling this function 1451 * 3) elapsed time in this mode (not used, for now) 1452 */ 1453 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1454 { 1455 struct iwl_scale_tbl_info *tbl; 1456 int active_tbl; 1457 int flush_interval_passed = 0; 1458 struct iwl_mvm *mvm; 1459 1460 mvm = lq_sta->pers.drv; 1461 active_tbl = lq_sta->active_tbl; 1462 1463 tbl = &(lq_sta->lq_info[active_tbl]); 1464 1465 /* If we've been disallowing search, see if we should now allow it */ 1466 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1467 /* Elapsed time using current modulation mode */ 1468 if (lq_sta->flush_timer) 1469 flush_interval_passed = 1470 time_after(jiffies, 1471 (unsigned long)(lq_sta->flush_timer + 1472 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1473 1474 /* 1475 * Check if we should allow search for new modulation mode. 1476 * If many frames have failed or succeeded, or we've used 1477 * this same modulation for a long time, allow search, and 1478 * reset history stats that keep track of whether we should 1479 * allow a new search. Also (below) reset all bitmaps and 1480 * stats in active history. 1481 */ 1482 if (force_search || 1483 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1484 (lq_sta->total_success > lq_sta->max_success_limit) || 1485 ((!lq_sta->search_better_tbl) && 1486 (lq_sta->flush_timer) && (flush_interval_passed))) { 1487 IWL_DEBUG_RATE(mvm, 1488 "LQ: stay is expired %d %d %d\n", 1489 lq_sta->total_failed, 1490 lq_sta->total_success, 1491 flush_interval_passed); 1492 1493 /* Allow search for new mode */ 1494 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1495 IWL_DEBUG_RATE(mvm, 1496 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1497 lq_sta->total_failed = 0; 1498 lq_sta->total_success = 0; 1499 lq_sta->flush_timer = 0; 1500 /* mark the current column as visited */ 1501 lq_sta->visited_columns = BIT(tbl->column); 1502 /* 1503 * Else if we've used this modulation mode enough repetitions 1504 * (regardless of elapsed time or success/failure), reset 1505 * history bitmaps and rate-specific stats for all rates in 1506 * active table. 1507 */ 1508 } else { 1509 lq_sta->table_count++; 1510 if (lq_sta->table_count >= 1511 lq_sta->table_count_limit) { 1512 lq_sta->table_count = 0; 1513 1514 IWL_DEBUG_RATE(mvm, 1515 "LQ: stay in table clear win\n"); 1516 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1517 } 1518 } 1519 1520 /* If transitioning to allow "search", reset all history 1521 * bitmaps and stats in active table (this will become the new 1522 * "search" table). */ 1523 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1524 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1525 } 1526 } 1527 } 1528 1529 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1530 struct iwl_scale_tbl_info *tbl, 1531 enum rs_action scale_action) 1532 { 1533 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1534 int i; 1535 1536 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta); 1537 1538 /* 1539 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1540 * or 0, since there is no per-TID alg. 1541 */ 1542 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1543 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1544 scale_action == RS_ACTION_DOWNSCALE) 1545 mvmsta->amsdu_enabled = 0; 1546 else 1547 mvmsta->amsdu_enabled = 0xFFFF; 1548 1549 if (mvmsta->vif->bss_conf.he_support && 1550 !iwlwifi_mod_params.disable_11ax) 1551 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1552 else 1553 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1554 1555 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1556 1557 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1558 if (mvmsta->amsdu_enabled) 1559 sta->max_tid_amsdu_len[i] = 1560 iwl_mvm_max_amsdu_size(mvm, sta, i); 1561 else 1562 /* 1563 * Not so elegant, but this will effectively 1564 * prevent AMSDU on this TID 1565 */ 1566 sta->max_tid_amsdu_len[i] = 1; 1567 } 1568 } 1569 1570 /* 1571 * setup rate table in uCode 1572 */ 1573 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1574 struct ieee80211_sta *sta, 1575 struct iwl_lq_sta *lq_sta, 1576 struct iwl_scale_tbl_info *tbl) 1577 { 1578 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1579 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 1580 } 1581 1582 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1583 struct ieee80211_sta *sta, 1584 struct iwl_lq_sta *lq_sta, 1585 struct iwl_scale_tbl_info *tbl, 1586 enum rs_action scale_action) 1587 { 1588 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1589 return false; 1590 1591 if (!is_vht_siso(&tbl->rate)) 1592 return false; 1593 1594 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1595 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1596 (scale_action == RS_ACTION_DOWNSCALE)) { 1597 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1598 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1599 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1600 goto tweaked; 1601 } 1602 1603 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1604 * sustainable, i.e. we're past the test window. We can't go back 1605 * if MCS5 is just tested as this will happen always after switching 1606 * to 20Mhz MCS4 because the rate stats are cleared. 1607 */ 1608 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1609 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1610 (scale_action == RS_ACTION_STAY)) || 1611 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1612 (scale_action == RS_ACTION_UPSCALE)))) { 1613 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1614 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1615 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1616 goto tweaked; 1617 } 1618 1619 return false; 1620 1621 tweaked: 1622 rs_set_expected_tpt_table(lq_sta, tbl); 1623 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1624 return true; 1625 } 1626 1627 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1628 struct iwl_lq_sta *lq_sta, 1629 struct ieee80211_sta *sta, 1630 struct iwl_scale_tbl_info *tbl) 1631 { 1632 int i, j, max_rate; 1633 enum rs_column next_col_id; 1634 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1635 const struct rs_tx_column *next_col; 1636 allow_column_func_t allow_func; 1637 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1638 const u16 *expected_tpt_tbl; 1639 u16 tpt, max_expected_tpt; 1640 1641 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1642 next_col_id = curr_col->next_columns[i]; 1643 1644 if (next_col_id == RS_COLUMN_INVALID) 1645 continue; 1646 1647 if (lq_sta->visited_columns & BIT(next_col_id)) { 1648 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1649 next_col_id); 1650 continue; 1651 } 1652 1653 next_col = &rs_tx_columns[next_col_id]; 1654 1655 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1656 IWL_DEBUG_RATE(mvm, 1657 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1658 next_col_id, valid_ants, next_col->ant); 1659 continue; 1660 } 1661 1662 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1663 allow_func = next_col->checks[j]; 1664 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1665 next_col)) 1666 break; 1667 } 1668 1669 if (j != MAX_COLUMN_CHECKS) { 1670 IWL_DEBUG_RATE(mvm, 1671 "Skip column %d: not allowed (check %d failed)\n", 1672 next_col_id, j); 1673 1674 continue; 1675 } 1676 1677 tpt = lq_sta->last_tpt / 100; 1678 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1679 rs_bw_from_sta_bw(sta)); 1680 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1681 continue; 1682 1683 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1684 if (max_rate == IWL_RATE_INVALID) { 1685 IWL_DEBUG_RATE(mvm, 1686 "Skip column %d: no rate is allowed in this column\n", 1687 next_col_id); 1688 continue; 1689 } 1690 1691 max_expected_tpt = expected_tpt_tbl[max_rate]; 1692 if (tpt >= max_expected_tpt) { 1693 IWL_DEBUG_RATE(mvm, 1694 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1695 next_col_id, max_expected_tpt, tpt); 1696 continue; 1697 } 1698 1699 IWL_DEBUG_RATE(mvm, 1700 "Found potential column %d. Max expected %d current %d\n", 1701 next_col_id, max_expected_tpt, tpt); 1702 break; 1703 } 1704 1705 if (i == MAX_NEXT_COLUMNS) 1706 return RS_COLUMN_INVALID; 1707 1708 return next_col_id; 1709 } 1710 1711 static int rs_switch_to_column(struct iwl_mvm *mvm, 1712 struct iwl_lq_sta *lq_sta, 1713 struct ieee80211_sta *sta, 1714 enum rs_column col_id) 1715 { 1716 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 1717 struct iwl_scale_tbl_info *search_tbl = 1718 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 1719 struct rs_rate *rate = &search_tbl->rate; 1720 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1721 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1722 unsigned long rate_mask = 0; 1723 u32 rate_idx = 0; 1724 1725 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1726 1727 rate->sgi = column->sgi; 1728 rate->ant = column->ant; 1729 1730 if (column->mode == RS_LEGACY) { 1731 if (lq_sta->band == NL80211_BAND_5GHZ) 1732 rate->type = LQ_LEGACY_A; 1733 else 1734 rate->type = LQ_LEGACY_G; 1735 1736 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1737 rate->ldpc = false; 1738 rate_mask = lq_sta->active_legacy_rate; 1739 } else if (column->mode == RS_SISO) { 1740 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1741 rate_mask = lq_sta->active_siso_rate; 1742 } else if (column->mode == RS_MIMO2) { 1743 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1744 rate_mask = lq_sta->active_mimo2_rate; 1745 } else { 1746 WARN_ONCE(1, "Bad column mode"); 1747 } 1748 1749 if (column->mode != RS_LEGACY) { 1750 rate->bw = rs_bw_from_sta_bw(sta); 1751 rate->ldpc = lq_sta->ldpc; 1752 } 1753 1754 search_tbl->column = col_id; 1755 rs_set_expected_tpt_table(lq_sta, search_tbl); 1756 1757 lq_sta->visited_columns |= BIT(col_id); 1758 1759 /* Get the best matching rate if we're changing modes. e.g. 1760 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1761 */ 1762 if (curr_column->mode != column->mode) { 1763 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1764 rate_mask, rate->index); 1765 1766 if ((rate_idx == IWL_RATE_INVALID) || 1767 !(BIT(rate_idx) & rate_mask)) { 1768 IWL_DEBUG_RATE(mvm, 1769 "can not switch with index %d" 1770 " rate mask %lx\n", 1771 rate_idx, rate_mask); 1772 1773 goto err; 1774 } 1775 1776 rate->index = rate_idx; 1777 } 1778 1779 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1780 col_id, rate->index); 1781 1782 return 0; 1783 1784 err: 1785 rate->type = LQ_NONE; 1786 return -1; 1787 } 1788 1789 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1790 struct iwl_scale_tbl_info *tbl, 1791 s32 sr, int low, int high, 1792 int current_tpt, 1793 int low_tpt, int high_tpt) 1794 { 1795 enum rs_action action = RS_ACTION_STAY; 1796 1797 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1798 (current_tpt == 0)) { 1799 IWL_DEBUG_RATE(mvm, 1800 "Decrease rate because of low SR\n"); 1801 return RS_ACTION_DOWNSCALE; 1802 } 1803 1804 if ((low_tpt == IWL_INVALID_VALUE) && 1805 (high_tpt == IWL_INVALID_VALUE) && 1806 (high != IWL_RATE_INVALID)) { 1807 IWL_DEBUG_RATE(mvm, 1808 "No data about high/low rates. Increase rate\n"); 1809 return RS_ACTION_UPSCALE; 1810 } 1811 1812 if ((high_tpt == IWL_INVALID_VALUE) && 1813 (high != IWL_RATE_INVALID) && 1814 (low_tpt != IWL_INVALID_VALUE) && 1815 (low_tpt < current_tpt)) { 1816 IWL_DEBUG_RATE(mvm, 1817 "No data about high rate and low rate is worse. Increase rate\n"); 1818 return RS_ACTION_UPSCALE; 1819 } 1820 1821 if ((high_tpt != IWL_INVALID_VALUE) && 1822 (high_tpt > current_tpt)) { 1823 IWL_DEBUG_RATE(mvm, 1824 "Higher rate is better. Increate rate\n"); 1825 return RS_ACTION_UPSCALE; 1826 } 1827 1828 if ((low_tpt != IWL_INVALID_VALUE) && 1829 (high_tpt != IWL_INVALID_VALUE) && 1830 (low_tpt < current_tpt) && 1831 (high_tpt < current_tpt)) { 1832 IWL_DEBUG_RATE(mvm, 1833 "Both high and low are worse. Maintain rate\n"); 1834 return RS_ACTION_STAY; 1835 } 1836 1837 if ((low_tpt != IWL_INVALID_VALUE) && 1838 (low_tpt > current_tpt)) { 1839 IWL_DEBUG_RATE(mvm, 1840 "Lower rate is better\n"); 1841 action = RS_ACTION_DOWNSCALE; 1842 goto out; 1843 } 1844 1845 if ((low_tpt == IWL_INVALID_VALUE) && 1846 (low != IWL_RATE_INVALID)) { 1847 IWL_DEBUG_RATE(mvm, 1848 "No data about lower rate\n"); 1849 action = RS_ACTION_DOWNSCALE; 1850 goto out; 1851 } 1852 1853 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1854 1855 out: 1856 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1857 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1858 IWL_DEBUG_RATE(mvm, 1859 "SR is above NO DECREASE. Avoid downscale\n"); 1860 action = RS_ACTION_STAY; 1861 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1862 IWL_DEBUG_RATE(mvm, 1863 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1864 action = RS_ACTION_STAY; 1865 } else { 1866 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1867 } 1868 } 1869 1870 return action; 1871 } 1872 1873 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1874 struct iwl_lq_sta *lq_sta) 1875 { 1876 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1877 * supports STBC of at least 1*SS 1878 */ 1879 if (!lq_sta->stbc_capable) 1880 return false; 1881 1882 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1883 return false; 1884 1885 return true; 1886 } 1887 1888 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1889 int *weaker, int *stronger) 1890 { 1891 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1892 if (*weaker > TPC_MAX_REDUCTION) 1893 *weaker = TPC_INVALID; 1894 1895 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1896 if (*stronger < 0) 1897 *stronger = TPC_INVALID; 1898 } 1899 1900 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1901 struct rs_rate *rate, enum nl80211_band band) 1902 { 1903 int index = rate->index; 1904 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1905 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1906 !vif->bss_conf.ps); 1907 1908 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1909 cam, sta_ps_disabled); 1910 /* 1911 * allow tpc only if power management is enabled, or bt coex 1912 * activity grade allows it and we are on 2.4Ghz. 1913 */ 1914 if ((cam || sta_ps_disabled) && 1915 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1916 return false; 1917 1918 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1919 if (is_legacy(rate)) 1920 return index == IWL_RATE_54M_INDEX; 1921 if (is_ht(rate)) 1922 return index == IWL_RATE_MCS_7_INDEX; 1923 if (is_vht(rate)) 1924 return index == IWL_RATE_MCS_7_INDEX || 1925 index == IWL_RATE_MCS_8_INDEX || 1926 index == IWL_RATE_MCS_9_INDEX; 1927 1928 WARN_ON_ONCE(1); 1929 return false; 1930 } 1931 1932 enum tpc_action { 1933 TPC_ACTION_STAY, 1934 TPC_ACTION_DECREASE, 1935 TPC_ACTION_INCREASE, 1936 TPC_ACTION_NO_RESTIRCTION, 1937 }; 1938 1939 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1940 s32 sr, int weak, int strong, 1941 int current_tpt, 1942 int weak_tpt, int strong_tpt) 1943 { 1944 /* stay until we have valid tpt */ 1945 if (current_tpt == IWL_INVALID_VALUE) { 1946 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1947 return TPC_ACTION_STAY; 1948 } 1949 1950 /* Too many failures, increase txp */ 1951 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1952 current_tpt == 0) { 1953 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1954 return TPC_ACTION_NO_RESTIRCTION; 1955 } 1956 1957 /* try decreasing first if applicable */ 1958 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1959 weak != TPC_INVALID) { 1960 if (weak_tpt == IWL_INVALID_VALUE && 1961 (strong_tpt == IWL_INVALID_VALUE || 1962 current_tpt >= strong_tpt)) { 1963 IWL_DEBUG_RATE(mvm, 1964 "no weak txp measurement. decrease txp\n"); 1965 return TPC_ACTION_DECREASE; 1966 } 1967 1968 if (weak_tpt > current_tpt) { 1969 IWL_DEBUG_RATE(mvm, 1970 "lower txp has better tpt. decrease txp\n"); 1971 return TPC_ACTION_DECREASE; 1972 } 1973 } 1974 1975 /* next, increase if needed */ 1976 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1977 strong != TPC_INVALID) { 1978 if (weak_tpt == IWL_INVALID_VALUE && 1979 strong_tpt != IWL_INVALID_VALUE && 1980 current_tpt < strong_tpt) { 1981 IWL_DEBUG_RATE(mvm, 1982 "higher txp has better tpt. increase txp\n"); 1983 return TPC_ACTION_INCREASE; 1984 } 1985 1986 if (weak_tpt < current_tpt && 1987 (strong_tpt == IWL_INVALID_VALUE || 1988 strong_tpt > current_tpt)) { 1989 IWL_DEBUG_RATE(mvm, 1990 "lower txp has worse tpt. increase txp\n"); 1991 return TPC_ACTION_INCREASE; 1992 } 1993 } 1994 1995 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 1996 return TPC_ACTION_STAY; 1997 } 1998 1999 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2000 struct ieee80211_sta *sta, 2001 struct iwl_lq_sta *lq_sta, 2002 struct iwl_scale_tbl_info *tbl) 2003 { 2004 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2005 struct ieee80211_vif *vif = mvm_sta->vif; 2006 struct ieee80211_chanctx_conf *chanctx_conf; 2007 enum nl80211_band band; 2008 struct iwl_rate_scale_data *window; 2009 struct rs_rate *rate = &tbl->rate; 2010 enum tpc_action action; 2011 s32 sr; 2012 u8 cur = lq_sta->lq.reduced_tpc; 2013 int current_tpt; 2014 int weak, strong; 2015 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2016 2017 #ifdef CONFIG_MAC80211_DEBUGFS 2018 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2019 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2020 lq_sta->pers.dbg_fixed_txp_reduction); 2021 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2022 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2023 } 2024 #endif 2025 2026 rcu_read_lock(); 2027 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2028 if (WARN_ON(!chanctx_conf)) 2029 band = NUM_NL80211_BANDS; 2030 else 2031 band = chanctx_conf->def.chan->band; 2032 rcu_read_unlock(); 2033 2034 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2035 IWL_DEBUG_RATE(mvm, 2036 "tpc is not allowed. remove txp restrictions\n"); 2037 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2038 return cur != TPC_NO_REDUCTION; 2039 } 2040 2041 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2042 2043 /* Collect measured throughputs for current and adjacent rates */ 2044 window = tbl->tpc_win; 2045 sr = window[cur].success_ratio; 2046 current_tpt = window[cur].average_tpt; 2047 if (weak != TPC_INVALID) 2048 weak_tpt = window[weak].average_tpt; 2049 if (strong != TPC_INVALID) 2050 strong_tpt = window[strong].average_tpt; 2051 2052 IWL_DEBUG_RATE(mvm, 2053 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2054 cur, current_tpt, sr, weak, strong, 2055 weak_tpt, strong_tpt); 2056 2057 action = rs_get_tpc_action(mvm, sr, weak, strong, 2058 current_tpt, weak_tpt, strong_tpt); 2059 2060 /* override actions if we are on the edge */ 2061 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2062 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2063 action = TPC_ACTION_STAY; 2064 } else if (strong == TPC_INVALID && 2065 (action == TPC_ACTION_INCREASE || 2066 action == TPC_ACTION_NO_RESTIRCTION)) { 2067 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2068 action = TPC_ACTION_STAY; 2069 } 2070 2071 switch (action) { 2072 case TPC_ACTION_DECREASE: 2073 lq_sta->lq.reduced_tpc = weak; 2074 return true; 2075 case TPC_ACTION_INCREASE: 2076 lq_sta->lq.reduced_tpc = strong; 2077 return true; 2078 case TPC_ACTION_NO_RESTIRCTION: 2079 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2080 return true; 2081 case TPC_ACTION_STAY: 2082 /* do nothing */ 2083 break; 2084 } 2085 return false; 2086 } 2087 2088 /* 2089 * Do rate scaling and search for new modulation mode. 2090 */ 2091 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2092 struct ieee80211_sta *sta, 2093 struct iwl_lq_sta *lq_sta, 2094 int tid, bool ndp) 2095 { 2096 int low = IWL_RATE_INVALID; 2097 int high = IWL_RATE_INVALID; 2098 int index; 2099 struct iwl_rate_scale_data *window = NULL; 2100 int current_tpt = IWL_INVALID_VALUE; 2101 int low_tpt = IWL_INVALID_VALUE; 2102 int high_tpt = IWL_INVALID_VALUE; 2103 u32 fail_count; 2104 enum rs_action scale_action = RS_ACTION_STAY; 2105 u16 rate_mask; 2106 u8 update_lq = 0; 2107 struct iwl_scale_tbl_info *tbl, *tbl1; 2108 u8 active_tbl = 0; 2109 u8 done_search = 0; 2110 u16 high_low; 2111 s32 sr; 2112 u8 prev_agg = lq_sta->is_agg; 2113 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2114 struct rs_rate *rate; 2115 2116 lq_sta->is_agg = !!mvmsta->agg_tids; 2117 2118 /* 2119 * Select rate-scale / modulation-mode table to work with in 2120 * the rest of this function: "search" if searching for better 2121 * modulation mode, or "active" if doing rate scaling within a mode. 2122 */ 2123 if (!lq_sta->search_better_tbl) 2124 active_tbl = lq_sta->active_tbl; 2125 else 2126 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2127 2128 tbl = &(lq_sta->lq_info[active_tbl]); 2129 rate = &tbl->rate; 2130 2131 if (prev_agg != lq_sta->is_agg) { 2132 IWL_DEBUG_RATE(mvm, 2133 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2134 prev_agg, lq_sta->is_agg); 2135 rs_set_expected_tpt_table(lq_sta, tbl); 2136 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2137 } 2138 2139 /* current tx rate */ 2140 index = rate->index; 2141 2142 /* rates available for this association, and for modulation mode */ 2143 rate_mask = rs_get_supported_rates(lq_sta, rate); 2144 2145 if (!(BIT(index) & rate_mask)) { 2146 IWL_ERR(mvm, "Current Rate is not valid\n"); 2147 if (lq_sta->search_better_tbl) { 2148 /* revert to active table if search table is not valid*/ 2149 rate->type = LQ_NONE; 2150 lq_sta->search_better_tbl = 0; 2151 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2152 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2153 } 2154 return; 2155 } 2156 2157 /* Get expected throughput table and history window for current rate */ 2158 if (!tbl->expected_tpt) { 2159 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2160 return; 2161 } 2162 2163 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2164 window = &(tbl->win[index]); 2165 2166 /* 2167 * If there is not enough history to calculate actual average 2168 * throughput, keep analyzing results of more tx frames, without 2169 * changing rate or mode (bypass most of the rest of this function). 2170 * Set up new rate table in uCode only if old rate is not supported 2171 * in current association (use new rate found above). 2172 */ 2173 fail_count = window->counter - window->success_counter; 2174 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2175 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2176 IWL_DEBUG_RATE(mvm, 2177 "%s: Test Window: succ %d total %d\n", 2178 rs_pretty_rate(rate), 2179 window->success_counter, window->counter); 2180 2181 /* Can't calculate this yet; not enough history */ 2182 window->average_tpt = IWL_INVALID_VALUE; 2183 2184 /* Should we stay with this modulation mode, 2185 * or search for a new one? */ 2186 rs_stay_in_table(lq_sta, false); 2187 2188 return; 2189 } 2190 2191 /* If we are searching for better modulation mode, check success. */ 2192 if (lq_sta->search_better_tbl) { 2193 /* If good success, continue using the "search" mode; 2194 * no need to send new link quality command, since we're 2195 * continuing to use the setup that we've been trying. */ 2196 if (window->average_tpt > lq_sta->last_tpt) { 2197 IWL_DEBUG_RATE(mvm, 2198 "SWITCHING TO NEW TABLE SR: %d " 2199 "cur-tpt %d old-tpt %d\n", 2200 window->success_ratio, 2201 window->average_tpt, 2202 lq_sta->last_tpt); 2203 2204 /* Swap tables; "search" becomes "active" */ 2205 lq_sta->active_tbl = active_tbl; 2206 current_tpt = window->average_tpt; 2207 /* Else poor success; go back to mode in "active" table */ 2208 } else { 2209 IWL_DEBUG_RATE(mvm, 2210 "GOING BACK TO THE OLD TABLE: SR %d " 2211 "cur-tpt %d old-tpt %d\n", 2212 window->success_ratio, 2213 window->average_tpt, 2214 lq_sta->last_tpt); 2215 2216 /* Nullify "search" table */ 2217 rate->type = LQ_NONE; 2218 2219 /* Revert to "active" table */ 2220 active_tbl = lq_sta->active_tbl; 2221 tbl = &(lq_sta->lq_info[active_tbl]); 2222 2223 /* Revert to "active" rate and throughput info */ 2224 index = tbl->rate.index; 2225 current_tpt = lq_sta->last_tpt; 2226 2227 /* Need to set up a new rate table in uCode */ 2228 update_lq = 1; 2229 } 2230 2231 /* Either way, we've made a decision; modulation mode 2232 * search is done, allow rate adjustment next time. */ 2233 lq_sta->search_better_tbl = 0; 2234 done_search = 1; /* Don't switch modes below! */ 2235 goto lq_update; 2236 } 2237 2238 /* (Else) not in search of better modulation mode, try for better 2239 * starting rate, while staying in this mode. */ 2240 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2241 low = high_low & 0xff; 2242 high = (high_low >> 8) & 0xff; 2243 2244 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2245 2246 sr = window->success_ratio; 2247 2248 /* Collect measured throughputs for current and adjacent rates */ 2249 current_tpt = window->average_tpt; 2250 if (low != IWL_RATE_INVALID) 2251 low_tpt = tbl->win[low].average_tpt; 2252 if (high != IWL_RATE_INVALID) 2253 high_tpt = tbl->win[high].average_tpt; 2254 2255 IWL_DEBUG_RATE(mvm, 2256 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2257 rs_pretty_rate(rate), current_tpt, sr, 2258 low, high, low_tpt, high_tpt); 2259 2260 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2261 current_tpt, low_tpt, high_tpt); 2262 2263 /* Force a search in case BT doesn't like us being in MIMO */ 2264 if (is_mimo(rate) && 2265 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2266 IWL_DEBUG_RATE(mvm, 2267 "BT Coex forbids MIMO. Search for new config\n"); 2268 rs_stay_in_table(lq_sta, true); 2269 goto lq_update; 2270 } 2271 2272 switch (scale_action) { 2273 case RS_ACTION_DOWNSCALE: 2274 /* Decrease starting rate, update uCode's rate table */ 2275 if (low != IWL_RATE_INVALID) { 2276 update_lq = 1; 2277 index = low; 2278 } else { 2279 IWL_DEBUG_RATE(mvm, 2280 "At the bottom rate. Can't decrease\n"); 2281 } 2282 2283 break; 2284 case RS_ACTION_UPSCALE: 2285 /* Increase starting rate, update uCode's rate table */ 2286 if (high != IWL_RATE_INVALID) { 2287 update_lq = 1; 2288 index = high; 2289 } else { 2290 IWL_DEBUG_RATE(mvm, 2291 "At the top rate. Can't increase\n"); 2292 } 2293 2294 break; 2295 case RS_ACTION_STAY: 2296 /* No change */ 2297 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2298 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2299 break; 2300 default: 2301 break; 2302 } 2303 2304 lq_update: 2305 /* Replace uCode's rate table for the destination station. */ 2306 if (update_lq) { 2307 tbl->rate.index = index; 2308 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2309 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2310 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2311 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2312 } 2313 2314 rs_stay_in_table(lq_sta, false); 2315 2316 /* 2317 * Search for new modulation mode if we're: 2318 * 1) Not changing rates right now 2319 * 2) Not just finishing up a search 2320 * 3) Allowing a new search 2321 */ 2322 if (!update_lq && !done_search && 2323 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2324 && window->counter) { 2325 enum rs_column next_column; 2326 2327 /* Save current throughput to compare with "search" throughput*/ 2328 lq_sta->last_tpt = current_tpt; 2329 2330 IWL_DEBUG_RATE(mvm, 2331 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2332 update_lq, done_search, lq_sta->rs_state, 2333 window->counter); 2334 2335 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2336 if (next_column != RS_COLUMN_INVALID) { 2337 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2338 next_column); 2339 if (!ret) 2340 lq_sta->search_better_tbl = 1; 2341 } else { 2342 IWL_DEBUG_RATE(mvm, 2343 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2344 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2345 } 2346 2347 /* If new "search" mode was selected, set up in uCode table */ 2348 if (lq_sta->search_better_tbl) { 2349 /* Access the "search" table, clear its history. */ 2350 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 2351 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2352 2353 /* Use new "search" start rate */ 2354 index = tbl->rate.index; 2355 2356 rs_dump_rate(mvm, &tbl->rate, 2357 "Switch to SEARCH TABLE:"); 2358 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2359 } else { 2360 done_search = 1; 2361 } 2362 } 2363 2364 if (!ndp) 2365 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2366 2367 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2368 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2369 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2370 } 2371 } 2372 2373 struct rs_init_rate_info { 2374 s8 rssi; 2375 u8 rate_idx; 2376 }; 2377 2378 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2379 { -60, IWL_RATE_54M_INDEX }, 2380 { -64, IWL_RATE_48M_INDEX }, 2381 { -68, IWL_RATE_36M_INDEX }, 2382 { -80, IWL_RATE_24M_INDEX }, 2383 { -84, IWL_RATE_18M_INDEX }, 2384 { -85, IWL_RATE_12M_INDEX }, 2385 { -86, IWL_RATE_11M_INDEX }, 2386 { -88, IWL_RATE_5M_INDEX }, 2387 { -90, IWL_RATE_2M_INDEX }, 2388 { S8_MIN, IWL_RATE_1M_INDEX }, 2389 }; 2390 2391 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2392 { -60, IWL_RATE_54M_INDEX }, 2393 { -64, IWL_RATE_48M_INDEX }, 2394 { -72, IWL_RATE_36M_INDEX }, 2395 { -80, IWL_RATE_24M_INDEX }, 2396 { -84, IWL_RATE_18M_INDEX }, 2397 { -85, IWL_RATE_12M_INDEX }, 2398 { -87, IWL_RATE_9M_INDEX }, 2399 { S8_MIN, IWL_RATE_6M_INDEX }, 2400 }; 2401 2402 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2403 { -60, IWL_RATE_MCS_7_INDEX }, 2404 { -64, IWL_RATE_MCS_6_INDEX }, 2405 { -68, IWL_RATE_MCS_5_INDEX }, 2406 { -72, IWL_RATE_MCS_4_INDEX }, 2407 { -80, IWL_RATE_MCS_3_INDEX }, 2408 { -84, IWL_RATE_MCS_2_INDEX }, 2409 { -85, IWL_RATE_MCS_1_INDEX }, 2410 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2411 }; 2412 2413 /* MCS index 9 is not valid for 20MHz VHT channel width, 2414 * but is ok for 40, 80 and 160MHz channels. 2415 */ 2416 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2417 { -60, IWL_RATE_MCS_8_INDEX }, 2418 { -64, IWL_RATE_MCS_7_INDEX }, 2419 { -68, IWL_RATE_MCS_6_INDEX }, 2420 { -72, IWL_RATE_MCS_5_INDEX }, 2421 { -80, IWL_RATE_MCS_4_INDEX }, 2422 { -84, IWL_RATE_MCS_3_INDEX }, 2423 { -85, IWL_RATE_MCS_2_INDEX }, 2424 { -87, IWL_RATE_MCS_1_INDEX }, 2425 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2426 }; 2427 2428 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2429 { -60, IWL_RATE_MCS_9_INDEX }, 2430 { -64, IWL_RATE_MCS_8_INDEX }, 2431 { -68, IWL_RATE_MCS_7_INDEX }, 2432 { -72, IWL_RATE_MCS_6_INDEX }, 2433 { -80, IWL_RATE_MCS_5_INDEX }, 2434 { -84, IWL_RATE_MCS_4_INDEX }, 2435 { -85, IWL_RATE_MCS_3_INDEX }, 2436 { -87, IWL_RATE_MCS_2_INDEX }, 2437 { -88, IWL_RATE_MCS_1_INDEX }, 2438 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2439 }; 2440 2441 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2442 2443 /* Init the optimal rate based on STA caps 2444 * This combined with rssi is used to report the last tx rate 2445 * to userspace when we haven't transmitted enough frames. 2446 */ 2447 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2448 struct ieee80211_sta *sta, 2449 struct iwl_lq_sta *lq_sta) 2450 { 2451 struct rs_rate *rate = &lq_sta->optimal_rate; 2452 2453 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2454 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2455 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2456 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2457 else if (lq_sta->band == NL80211_BAND_5GHZ) 2458 rate->type = LQ_LEGACY_A; 2459 else 2460 rate->type = LQ_LEGACY_G; 2461 2462 rate->bw = rs_bw_from_sta_bw(sta); 2463 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2464 2465 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2466 2467 if (is_mimo(rate)) { 2468 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2469 } else if (is_siso(rate)) { 2470 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2471 } else { 2472 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2473 2474 if (lq_sta->band == NL80211_BAND_5GHZ) { 2475 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2476 lq_sta->optimal_nentries = 2477 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2478 } else { 2479 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2480 lq_sta->optimal_nentries = 2481 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2482 } 2483 } 2484 2485 if (is_vht(rate)) { 2486 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2487 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2488 lq_sta->optimal_nentries = 2489 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2490 } else { 2491 lq_sta->optimal_rates = rs_optimal_rates_vht; 2492 lq_sta->optimal_nentries = 2493 ARRAY_SIZE(rs_optimal_rates_vht); 2494 } 2495 } else if (is_ht(rate)) { 2496 lq_sta->optimal_rates = rs_optimal_rates_ht; 2497 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2498 } 2499 } 2500 2501 /* Compute the optimal rate index based on RSSI */ 2502 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2503 struct iwl_lq_sta *lq_sta) 2504 { 2505 struct rs_rate *rate = &lq_sta->optimal_rate; 2506 int i; 2507 2508 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2509 BITS_PER_LONG); 2510 2511 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2512 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2513 2514 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2515 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2516 rate->index = rate_idx; 2517 break; 2518 } 2519 } 2520 2521 return rate; 2522 } 2523 2524 /* Choose an initial legacy rate and antenna to use based on the RSSI 2525 * of last Rx 2526 */ 2527 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2528 struct ieee80211_sta *sta, 2529 struct iwl_lq_sta *lq_sta, 2530 enum nl80211_band band, 2531 struct rs_rate *rate) 2532 { 2533 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2534 int i, nentries; 2535 unsigned long active_rate; 2536 s8 best_rssi = S8_MIN; 2537 u8 best_ant = ANT_NONE; 2538 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2539 const struct rs_init_rate_info *initial_rates; 2540 2541 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2542 if (!(lq_sta->pers.chains & BIT(i))) 2543 continue; 2544 2545 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2546 best_rssi = lq_sta->pers.chain_signal[i]; 2547 best_ant = BIT(i); 2548 } 2549 } 2550 2551 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2552 rs_pretty_ant(best_ant), best_rssi); 2553 2554 if (best_ant != ANT_A && best_ant != ANT_B) 2555 rate->ant = first_antenna(valid_tx_ant); 2556 else 2557 rate->ant = best_ant; 2558 2559 rate->sgi = false; 2560 rate->ldpc = false; 2561 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2562 2563 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2564 BITS_PER_LONG); 2565 2566 if (band == NL80211_BAND_5GHZ) { 2567 rate->type = LQ_LEGACY_A; 2568 initial_rates = rs_optimal_rates_5ghz_legacy; 2569 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2570 } else { 2571 rate->type = LQ_LEGACY_G; 2572 initial_rates = rs_optimal_rates_24ghz_legacy; 2573 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2574 } 2575 2576 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2577 goto out; 2578 2579 /* Start from a higher rate if the corresponding debug capability 2580 * is enabled. The rate is chosen according to AP capabilities. 2581 * In case of VHT/HT when the rssi is low fallback to the case of 2582 * legacy rates. 2583 */ 2584 if (sta->vht_cap.vht_supported && 2585 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2586 /* 2587 * In AP mode, when a new station associates, rs is initialized 2588 * immediately upon association completion, before the phy 2589 * context is updated with the association parameters, so the 2590 * sta bandwidth might be wider than the phy context allows. 2591 * To avoid this issue, always initialize rs with 20mhz 2592 * bandwidth rate, and after authorization, when the phy context 2593 * is already up-to-date, re-init rs with the correct bw. 2594 */ 2595 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2596 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2597 2598 switch (bw) { 2599 case RATE_MCS_CHAN_WIDTH_40: 2600 case RATE_MCS_CHAN_WIDTH_80: 2601 case RATE_MCS_CHAN_WIDTH_160: 2602 initial_rates = rs_optimal_rates_vht; 2603 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2604 break; 2605 case RATE_MCS_CHAN_WIDTH_20: 2606 initial_rates = rs_optimal_rates_vht_20mhz; 2607 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2608 break; 2609 default: 2610 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2611 goto out; 2612 } 2613 2614 active_rate = lq_sta->active_siso_rate; 2615 rate->type = LQ_VHT_SISO; 2616 rate->bw = bw; 2617 } else if (sta->ht_cap.ht_supported && 2618 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2619 initial_rates = rs_optimal_rates_ht; 2620 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2621 active_rate = lq_sta->active_siso_rate; 2622 rate->type = LQ_HT_SISO; 2623 } else { 2624 active_rate = lq_sta->active_legacy_rate; 2625 } 2626 2627 for (i = 0; i < nentries; i++) { 2628 int rate_idx = initial_rates[i].rate_idx; 2629 2630 if ((best_rssi >= initial_rates[i].rssi) && 2631 (BIT(rate_idx) & active_rate)) { 2632 rate->index = rate_idx; 2633 break; 2634 } 2635 } 2636 2637 out: 2638 rs_dump_rate(mvm, rate, "INITIAL"); 2639 } 2640 2641 /* Save info about RSSI of last Rx */ 2642 void rs_update_last_rssi(struct iwl_mvm *mvm, 2643 struct iwl_mvm_sta *mvmsta, 2644 struct ieee80211_rx_status *rx_status) 2645 { 2646 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2647 int i; 2648 2649 lq_sta->pers.chains = rx_status->chains; 2650 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2651 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2652 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2653 lq_sta->pers.last_rssi = S8_MIN; 2654 2655 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2656 if (!(lq_sta->pers.chains & BIT(i))) 2657 continue; 2658 2659 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2660 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2661 } 2662 } 2663 2664 /** 2665 * rs_initialize_lq - Initialize a station's hardware rate table 2666 * 2667 * The uCode's station table contains a table of fallback rates 2668 * for automatic fallback during transmission. 2669 * 2670 * NOTE: This sets up a default set of values. These will be replaced later 2671 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2672 * rc80211_simple. 2673 * 2674 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2675 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2676 * which requires station table entry to exist). 2677 */ 2678 static void rs_initialize_lq(struct iwl_mvm *mvm, 2679 struct ieee80211_sta *sta, 2680 struct iwl_lq_sta *lq_sta, 2681 enum nl80211_band band) 2682 { 2683 struct iwl_scale_tbl_info *tbl; 2684 struct rs_rate *rate; 2685 u8 active_tbl = 0; 2686 2687 if (!sta || !lq_sta) 2688 return; 2689 2690 if (!lq_sta->search_better_tbl) 2691 active_tbl = lq_sta->active_tbl; 2692 else 2693 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2694 2695 tbl = &(lq_sta->lq_info[active_tbl]); 2696 rate = &tbl->rate; 2697 2698 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2699 rs_init_optimal_rate(mvm, sta, lq_sta); 2700 2701 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2702 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2703 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2704 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2705 2706 tbl->column = rs_get_column_from_rate(rate); 2707 2708 rs_set_expected_tpt_table(lq_sta, tbl); 2709 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2710 /* TODO restore station should remember the lq cmd */ 2711 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 2712 } 2713 2714 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2715 void *mvm_sta, 2716 struct ieee80211_tx_rate_control *txrc) 2717 { 2718 struct iwl_op_mode *op_mode = mvm_r; 2719 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2720 struct sk_buff *skb = txrc->skb; 2721 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2722 struct iwl_lq_sta *lq_sta; 2723 struct rs_rate *optimal_rate; 2724 u32 last_ucode_rate; 2725 2726 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2727 /* if vif isn't initialized mvm doesn't know about 2728 * this station, so don't do anything with the it 2729 */ 2730 sta = NULL; 2731 mvm_sta = NULL; 2732 } 2733 2734 if (!mvm_sta) 2735 return; 2736 2737 lq_sta = mvm_sta; 2738 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2739 info->band, &info->control.rates[0]); 2740 info->control.rates[0].count = 1; 2741 2742 /* Report the optimal rate based on rssi and STA caps if we haven't 2743 * converged yet (too little traffic) or exploring other modulations 2744 */ 2745 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2746 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2747 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2748 optimal_rate); 2749 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2750 &txrc->reported_rate); 2751 } 2752 } 2753 2754 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2755 gfp_t gfp) 2756 { 2757 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2758 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2759 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2760 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2761 2762 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2763 2764 lq_sta->pers.drv = mvm; 2765 #ifdef CONFIG_MAC80211_DEBUGFS 2766 lq_sta->pers.dbg_fixed_rate = 0; 2767 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2768 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2769 #endif 2770 lq_sta->pers.chains = 0; 2771 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2772 lq_sta->pers.last_rssi = S8_MIN; 2773 2774 return lq_sta; 2775 } 2776 2777 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2778 int nss) 2779 { 2780 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2781 (0x3 << (2 * (nss - 1))); 2782 rx_mcs >>= (2 * (nss - 1)); 2783 2784 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2785 return IWL_RATE_MCS_7_INDEX; 2786 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2787 return IWL_RATE_MCS_8_INDEX; 2788 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2789 return IWL_RATE_MCS_9_INDEX; 2790 2791 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2792 return -1; 2793 } 2794 2795 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2796 struct ieee80211_sta_vht_cap *vht_cap, 2797 struct iwl_lq_sta *lq_sta) 2798 { 2799 int i; 2800 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2801 2802 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2803 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2804 if (i == IWL_RATE_9M_INDEX) 2805 continue; 2806 2807 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2808 if (i == IWL_RATE_MCS_9_INDEX && 2809 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2810 continue; 2811 2812 lq_sta->active_siso_rate |= BIT(i); 2813 } 2814 } 2815 2816 if (sta->rx_nss < 2) 2817 return; 2818 2819 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2820 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2821 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2822 if (i == IWL_RATE_9M_INDEX) 2823 continue; 2824 2825 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2826 if (i == IWL_RATE_MCS_9_INDEX && 2827 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2828 continue; 2829 2830 lq_sta->active_mimo2_rate |= BIT(i); 2831 } 2832 } 2833 } 2834 2835 static void rs_ht_init(struct iwl_mvm *mvm, 2836 struct ieee80211_sta *sta, 2837 struct iwl_lq_sta *lq_sta, 2838 struct ieee80211_sta_ht_cap *ht_cap) 2839 { 2840 /* active_siso_rate mask includes 9 MBits (bit 5), 2841 * and CCK (bits 0-3), supp_rates[] does not; 2842 * shift to convert format, force 9 MBits off. 2843 */ 2844 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2845 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2846 lq_sta->active_siso_rate &= ~((u16)0x2); 2847 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2848 2849 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2850 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2851 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2852 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2853 2854 if (mvm->cfg->ht_params->ldpc && 2855 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2856 lq_sta->ldpc = true; 2857 2858 if (mvm->cfg->ht_params->stbc && 2859 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2860 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2861 lq_sta->stbc_capable = true; 2862 2863 lq_sta->is_vht = false; 2864 } 2865 2866 static void rs_vht_init(struct iwl_mvm *mvm, 2867 struct ieee80211_sta *sta, 2868 struct iwl_lq_sta *lq_sta, 2869 struct ieee80211_sta_vht_cap *vht_cap) 2870 { 2871 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2872 2873 if (mvm->cfg->ht_params->ldpc && 2874 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2875 lq_sta->ldpc = true; 2876 2877 if (mvm->cfg->ht_params->stbc && 2878 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2879 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2880 lq_sta->stbc_capable = true; 2881 2882 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2883 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2884 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2885 lq_sta->bfer_capable = true; 2886 2887 lq_sta->is_vht = true; 2888 } 2889 2890 #ifdef CONFIG_IWLWIFI_DEBUGFS 2891 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2892 { 2893 spin_lock_bh(&mvm->drv_stats_lock); 2894 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2895 spin_unlock_bh(&mvm->drv_stats_lock); 2896 } 2897 2898 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2899 { 2900 u8 nss = 0; 2901 2902 spin_lock(&mvm->drv_stats_lock); 2903 2904 if (agg) 2905 mvm->drv_rx_stats.agg_frames++; 2906 2907 mvm->drv_rx_stats.success_frames++; 2908 2909 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 2910 case RATE_MCS_CHAN_WIDTH_20: 2911 mvm->drv_rx_stats.bw_20_frames++; 2912 break; 2913 case RATE_MCS_CHAN_WIDTH_40: 2914 mvm->drv_rx_stats.bw_40_frames++; 2915 break; 2916 case RATE_MCS_CHAN_WIDTH_80: 2917 mvm->drv_rx_stats.bw_80_frames++; 2918 break; 2919 case RATE_MCS_CHAN_WIDTH_160: 2920 mvm->drv_rx_stats.bw_160_frames++; 2921 break; 2922 default: 2923 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2924 } 2925 2926 if (rate & RATE_MCS_HT_MSK) { 2927 mvm->drv_rx_stats.ht_frames++; 2928 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 2929 } else if (rate & RATE_MCS_VHT_MSK) { 2930 mvm->drv_rx_stats.vht_frames++; 2931 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2932 RATE_VHT_MCS_NSS_POS) + 1; 2933 } else { 2934 mvm->drv_rx_stats.legacy_frames++; 2935 } 2936 2937 if (nss == 1) 2938 mvm->drv_rx_stats.siso_frames++; 2939 else if (nss == 2) 2940 mvm->drv_rx_stats.mimo2_frames++; 2941 2942 if (rate & RATE_MCS_SGI_MSK) 2943 mvm->drv_rx_stats.sgi_frames++; 2944 else 2945 mvm->drv_rx_stats.ngi_frames++; 2946 2947 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2948 mvm->drv_rx_stats.last_frame_idx = 2949 (mvm->drv_rx_stats.last_frame_idx + 1) % 2950 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2951 2952 spin_unlock(&mvm->drv_stats_lock); 2953 } 2954 #endif 2955 2956 /* 2957 * Called after adding a new station to initialize rate scaling 2958 */ 2959 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2960 enum nl80211_band band) 2961 { 2962 int i, j; 2963 struct ieee80211_hw *hw = mvm->hw; 2964 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2965 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2966 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2967 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2968 struct ieee80211_supported_band *sband; 2969 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2970 2971 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock); 2972 2973 /* clear all non-persistent lq data */ 2974 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2975 2976 sband = hw->wiphy->bands[band]; 2977 2978 lq_sta->lq.sta_id = mvmsta->sta_id; 2979 mvmsta->amsdu_enabled = 0; 2980 mvmsta->max_amsdu_len = sta->max_amsdu_len; 2981 2982 for (j = 0; j < LQ_SIZE; j++) 2983 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2984 2985 lq_sta->flush_timer = 0; 2986 lq_sta->last_tx = jiffies; 2987 2988 IWL_DEBUG_RATE(mvm, 2989 "LQ: *** rate scale station global init for station %d ***\n", 2990 mvmsta->sta_id); 2991 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2992 * the lowest or the highest rate.. Could consider using RSSI from 2993 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2994 * after assoc.. */ 2995 2996 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 2997 lq_sta->band = sband->band; 2998 /* 2999 * active legacy rates as per supported rates bitmap 3000 */ 3001 supp = sta->supp_rates[sband->band]; 3002 lq_sta->active_legacy_rate = 0; 3003 for_each_set_bit(i, &supp, BITS_PER_LONG) 3004 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3005 3006 /* TODO: should probably account for rx_highest for both HT/VHT */ 3007 if (!vht_cap || !vht_cap->vht_supported) 3008 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3009 else 3010 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3011 3012 lq_sta->max_legacy_rate_idx = 3013 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3014 lq_sta->max_siso_rate_idx = 3015 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3016 lq_sta->max_mimo2_rate_idx = 3017 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3018 3019 IWL_DEBUG_RATE(mvm, 3020 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3021 lq_sta->active_legacy_rate, 3022 lq_sta->active_siso_rate, 3023 lq_sta->active_mimo2_rate, 3024 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3025 lq_sta->bfer_capable); 3026 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3027 lq_sta->max_legacy_rate_idx, 3028 lq_sta->max_siso_rate_idx, 3029 lq_sta->max_mimo2_rate_idx); 3030 3031 /* These values will be overridden later */ 3032 lq_sta->lq.single_stream_ant_msk = 3033 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3034 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3035 3036 /* as default allow aggregation for all tids */ 3037 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3038 lq_sta->is_agg = 0; 3039 #ifdef CONFIG_IWLWIFI_DEBUGFS 3040 iwl_mvm_reset_frame_stats(mvm); 3041 #endif 3042 rs_initialize_lq(mvm, sta, lq_sta, band); 3043 } 3044 3045 static void rs_drv_rate_update(void *mvm_r, 3046 struct ieee80211_supported_band *sband, 3047 struct cfg80211_chan_def *chandef, 3048 struct ieee80211_sta *sta, 3049 void *priv_sta, u32 changed) 3050 { 3051 struct iwl_op_mode *op_mode = mvm_r; 3052 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3053 u8 tid; 3054 3055 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3056 return; 3057 3058 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3059 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3060 ieee80211_stop_tx_ba_session(sta, tid); 3061 3062 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3063 } 3064 3065 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, 3066 struct ieee80211_sta *sta, 3067 int tid, struct ieee80211_tx_info *info, 3068 bool ndp) 3069 { 3070 int legacy_success; 3071 int retries; 3072 int i; 3073 struct iwl_lq_cmd *table; 3074 u32 lq_hwrate; 3075 struct rs_rate lq_rate, tx_resp_rate; 3076 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 3077 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 3078 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 3079 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 3080 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 3081 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3082 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3083 3084 if (!lq_sta->pers.drv) { 3085 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 3086 return; 3087 } 3088 3089 /* This packet was aggregated but doesn't carry status info */ 3090 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 3091 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 3092 return; 3093 3094 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 3095 &tx_resp_rate)) { 3096 WARN_ON_ONCE(1); 3097 return; 3098 } 3099 3100 #ifdef CONFIG_MAC80211_DEBUGFS 3101 /* Disable last tx check if we are debugging with fixed rate but 3102 * update tx stats 3103 */ 3104 if (lq_sta->pers.dbg_fixed_rate) { 3105 int index = tx_resp_rate.index; 3106 enum rs_column column; 3107 int attempts, success; 3108 3109 column = rs_get_column_from_rate(&tx_resp_rate); 3110 if (WARN_ONCE(column == RS_COLUMN_INVALID, 3111 "Can't map rate 0x%x to column", 3112 tx_resp_hwrate)) 3113 return; 3114 3115 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3116 attempts = info->status.ampdu_len; 3117 success = info->status.ampdu_ack_len; 3118 } else { 3119 attempts = info->status.rates[0].count; 3120 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3121 } 3122 3123 lq_sta->pers.tx_stats[column][index].total += attempts; 3124 lq_sta->pers.tx_stats[column][index].success += success; 3125 3126 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 3127 tx_resp_hwrate, success, attempts); 3128 return; 3129 } 3130 #endif 3131 3132 if (time_after(jiffies, 3133 (unsigned long)(lq_sta->last_tx + 3134 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 3135 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 3136 /* reach here only in case of driver RS, call directly 3137 * the unlocked version 3138 */ 3139 rs_drv_rate_init(mvm, sta, info->band); 3140 return; 3141 } 3142 lq_sta->last_tx = jiffies; 3143 3144 /* Ignore this Tx frame response if its initial rate doesn't match 3145 * that of latest Link Quality command. There may be stragglers 3146 * from a previous Link Quality command, but we're no longer interested 3147 * in those; they're either from the "active" mode while we're trying 3148 * to check "search" mode, or a prior "search" mode after we've moved 3149 * to a new "search" mode (which might become the new "active" mode). 3150 */ 3151 table = &lq_sta->lq; 3152 lq_hwrate = le32_to_cpu(table->rs_table[0]); 3153 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 3154 WARN_ON_ONCE(1); 3155 return; 3156 } 3157 3158 /* Here we actually compare this rate to the latest LQ command */ 3159 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 3160 IWL_DEBUG_RATE(mvm, 3161 "tx resp color 0x%x does not match 0x%x\n", 3162 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 3163 3164 /* Since rates mis-match, the last LQ command may have failed. 3165 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 3166 * ... driver. 3167 */ 3168 lq_sta->missed_rate_counter++; 3169 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 3170 lq_sta->missed_rate_counter = 0; 3171 IWL_DEBUG_RATE(mvm, 3172 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 3173 lq_sta->rs_state); 3174 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 3175 } 3176 /* Regardless, ignore this status info for outdated rate */ 3177 return; 3178 } 3179 3180 /* Rate did match, so reset the missed_rate_counter */ 3181 lq_sta->missed_rate_counter = 0; 3182 3183 if (!lq_sta->search_better_tbl) { 3184 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3185 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3186 } else { 3187 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3188 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3189 } 3190 3191 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 3192 IWL_DEBUG_RATE(mvm, 3193 "Neither active nor search matches tx rate\n"); 3194 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3195 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 3196 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3197 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 3198 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 3199 3200 /* no matching table found, let's by-pass the data collection 3201 * and continue to perform rate scale to find the rate table 3202 */ 3203 rs_stay_in_table(lq_sta, true); 3204 goto done; 3205 } 3206 3207 /* Updating the frame history depends on whether packets were 3208 * aggregated. 3209 * 3210 * For aggregation, all packets were transmitted at the same rate, the 3211 * first index into rate scale table. 3212 */ 3213 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3214 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 3215 info->status.ampdu_len, 3216 info->status.ampdu_ack_len, 3217 reduced_txp); 3218 3219 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 3220 * it as a single frame loss as we don't want the success ratio 3221 * to dip too quickly because a BA wasn't received. 3222 * For TPC, there's no need for this optimisation since we want 3223 * to recover very quickly from a bad power reduction and, 3224 * therefore we'd like the success ratio to get an immediate hit 3225 * when failing to get a BA, so we'd switch back to a lower or 3226 * zero power reduction. When FW transmits agg with a rate 3227 * different from the initial rate, it will not use reduced txp 3228 * and will send BA notification twice (one empty with reduced 3229 * txp equal to the value from LQ and one with reduced txp 0). 3230 * We need to update counters for each txp level accordingly. 3231 */ 3232 if (info->status.ampdu_ack_len == 0) 3233 info->status.ampdu_len = 1; 3234 3235 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, 3236 tx_resp_rate.index, 3237 info->status.ampdu_len, 3238 info->status.ampdu_ack_len); 3239 3240 /* Update success/fail counts if not searching for new mode */ 3241 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3242 lq_sta->total_success += info->status.ampdu_ack_len; 3243 lq_sta->total_failed += (info->status.ampdu_len - 3244 info->status.ampdu_ack_len); 3245 } 3246 } else { 3247 /* For legacy, update frame history with for each Tx retry. */ 3248 retries = info->status.rates[0].count - 1; 3249 /* HW doesn't send more than 15 retries */ 3250 retries = min(retries, 15); 3251 3252 /* The last transmission may have been successful */ 3253 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3254 /* Collect data for each rate used during failed TX attempts */ 3255 for (i = 0; i <= retries; ++i) { 3256 lq_hwrate = le32_to_cpu(table->rs_table[i]); 3257 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 3258 &lq_rate)) { 3259 WARN_ON_ONCE(1); 3260 return; 3261 } 3262 3263 /* Only collect stats if retried rate is in the same RS 3264 * table as active/search. 3265 */ 3266 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 3267 tmp_tbl = curr_tbl; 3268 else if (rs_rate_column_match(&lq_rate, 3269 &other_tbl->rate)) 3270 tmp_tbl = other_tbl; 3271 else 3272 continue; 3273 3274 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 3275 tx_resp_rate.index, 1, 3276 i < retries ? 0 : legacy_success, 3277 reduced_txp); 3278 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 3279 tx_resp_rate.index, 1, 3280 i < retries ? 0 : legacy_success); 3281 } 3282 3283 /* Update success/fail counts if not searching for new mode */ 3284 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3285 lq_sta->total_success += legacy_success; 3286 lq_sta->total_failed += retries + (1 - legacy_success); 3287 } 3288 } 3289 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 3290 lq_sta->last_rate_n_flags = lq_hwrate; 3291 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 3292 done: 3293 /* See if there's a better rate or modulation mode to try. */ 3294 if (sta->supp_rates[info->band]) 3295 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 3296 } 3297 3298 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3299 int tid, struct ieee80211_tx_info *info, bool ndp) 3300 { 3301 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3302 3303 /* If it's locked we are in middle of init flow 3304 * just wait for next tx status to update the lq_sta data 3305 */ 3306 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock)) 3307 return; 3308 3309 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp); 3310 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 3311 } 3312 3313 #ifdef CONFIG_MAC80211_DEBUGFS 3314 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3315 struct iwl_lq_cmd *lq_cmd, 3316 enum nl80211_band band, 3317 u32 ucode_rate) 3318 { 3319 struct rs_rate rate; 3320 int i; 3321 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3322 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3323 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3324 3325 for (i = 0; i < num_rates; i++) 3326 lq_cmd->rs_table[i] = ucode_rate_le32; 3327 3328 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3329 WARN_ON_ONCE(1); 3330 return; 3331 } 3332 3333 if (is_mimo(&rate)) 3334 lq_cmd->mimo_delim = num_rates - 1; 3335 else 3336 lq_cmd->mimo_delim = 0; 3337 3338 lq_cmd->reduced_tpc = 0; 3339 3340 if (num_of_ant(ant) == 1) 3341 lq_cmd->single_stream_ant_msk = ant; 3342 3343 if (!mvm->trans->trans_cfg->gen2) 3344 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3345 else 3346 lq_cmd->agg_frame_cnt_limit = 3347 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3348 } 3349 #endif /* CONFIG_MAC80211_DEBUGFS */ 3350 3351 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3352 struct iwl_lq_sta *lq_sta, 3353 struct rs_rate *rate, 3354 __le32 *rs_table, int *rs_table_index, 3355 int num_rates, int num_retries, 3356 u8 valid_tx_ant, bool toggle_ant) 3357 { 3358 int i, j; 3359 __le32 ucode_rate; 3360 bool bottom_reached = false; 3361 int prev_rate_idx = rate->index; 3362 int end = LINK_QUAL_MAX_RETRY_NUM; 3363 int index = *rs_table_index; 3364 3365 for (i = 0; i < num_rates && index < end; i++) { 3366 for (j = 0; j < num_retries && index < end; j++, index++) { 3367 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3368 rate)); 3369 rs_table[index] = ucode_rate; 3370 if (toggle_ant) 3371 rs_toggle_antenna(valid_tx_ant, rate); 3372 } 3373 3374 prev_rate_idx = rate->index; 3375 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3376 if (bottom_reached && !is_legacy(rate)) 3377 break; 3378 } 3379 3380 if (!bottom_reached && !is_legacy(rate)) 3381 rate->index = prev_rate_idx; 3382 3383 *rs_table_index = index; 3384 } 3385 3386 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3387 * column the rate table should look like this: 3388 * 3389 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3390 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3391 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3392 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3393 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3394 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3395 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3396 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3397 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3398 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3399 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3400 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3401 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3402 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3403 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3404 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3405 */ 3406 static void rs_build_rates_table(struct iwl_mvm *mvm, 3407 struct ieee80211_sta *sta, 3408 struct iwl_lq_sta *lq_sta, 3409 const struct rs_rate *initial_rate) 3410 { 3411 struct rs_rate rate; 3412 int num_rates, num_retries, index = 0; 3413 u8 valid_tx_ant = 0; 3414 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3415 bool toggle_ant = false; 3416 u32 color; 3417 3418 memcpy(&rate, initial_rate, sizeof(rate)); 3419 3420 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3421 3422 /* TODO: remove old API when min FW API hits 14 */ 3423 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3424 rs_stbc_allow(mvm, sta, lq_sta)) 3425 rate.stbc = true; 3426 3427 if (is_siso(&rate)) { 3428 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3429 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3430 } else if (is_mimo(&rate)) { 3431 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3432 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3433 } else { 3434 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3435 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3436 toggle_ant = true; 3437 } 3438 3439 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3440 num_rates, num_retries, valid_tx_ant, 3441 toggle_ant); 3442 3443 rs_get_lower_rate_down_column(lq_sta, &rate); 3444 3445 if (is_siso(&rate)) { 3446 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3447 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3448 lq_cmd->mimo_delim = index; 3449 } else if (is_legacy(&rate)) { 3450 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3451 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3452 } else { 3453 WARN_ON_ONCE(1); 3454 } 3455 3456 toggle_ant = true; 3457 3458 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3459 num_rates, num_retries, valid_tx_ant, 3460 toggle_ant); 3461 3462 rs_get_lower_rate_down_column(lq_sta, &rate); 3463 3464 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3465 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3466 3467 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3468 num_rates, num_retries, valid_tx_ant, 3469 toggle_ant); 3470 3471 /* update the color of the LQ command (as a counter at bits 1-3) */ 3472 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3473 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3474 } 3475 3476 struct rs_bfer_active_iter_data { 3477 struct ieee80211_sta *exclude_sta; 3478 struct iwl_mvm_sta *bfer_mvmsta; 3479 }; 3480 3481 static void rs_bfer_active_iter(void *_data, 3482 struct ieee80211_sta *sta) 3483 { 3484 struct rs_bfer_active_iter_data *data = _data; 3485 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3486 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3487 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3488 3489 if (sta == data->exclude_sta) 3490 return; 3491 3492 /* The current sta has BFER allowed */ 3493 if (ss_params & LQ_SS_BFER_ALLOWED) { 3494 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3495 3496 data->bfer_mvmsta = mvmsta; 3497 } 3498 } 3499 3500 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3501 { 3502 int prio = -1; 3503 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3504 3505 switch (viftype) { 3506 case NL80211_IFTYPE_AP: 3507 case NL80211_IFTYPE_P2P_GO: 3508 prio = 3; 3509 break; 3510 case NL80211_IFTYPE_P2P_CLIENT: 3511 prio = 2; 3512 break; 3513 case NL80211_IFTYPE_STATION: 3514 prio = 1; 3515 break; 3516 default: 3517 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3518 prio = -1; 3519 } 3520 3521 return prio; 3522 } 3523 3524 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3525 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3526 struct iwl_mvm_sta *sta2) 3527 { 3528 int prio1 = rs_bfer_priority(sta1); 3529 int prio2 = rs_bfer_priority(sta2); 3530 3531 if (prio1 > prio2) 3532 return 1; 3533 if (prio1 < prio2) 3534 return -1; 3535 return 0; 3536 } 3537 3538 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3539 struct ieee80211_sta *sta, 3540 struct iwl_lq_sta *lq_sta, 3541 const struct rs_rate *initial_rate) 3542 { 3543 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3544 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3545 struct rs_bfer_active_iter_data data = { 3546 .exclude_sta = sta, 3547 .bfer_mvmsta = NULL, 3548 }; 3549 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3550 u32 ss_params = LQ_SS_PARAMS_VALID; 3551 3552 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3553 goto out; 3554 3555 #ifdef CONFIG_MAC80211_DEBUGFS 3556 /* Check if forcing the decision is configured. 3557 * Note that SISO is forced by not allowing STBC or BFER 3558 */ 3559 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3560 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3561 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3562 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3563 3564 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3565 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3566 lq_sta->pers.ss_force); 3567 goto out; 3568 } 3569 #endif 3570 3571 if (lq_sta->stbc_capable) 3572 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3573 3574 if (!lq_sta->bfer_capable) 3575 goto out; 3576 3577 ieee80211_iterate_stations_atomic(mvm->hw, 3578 rs_bfer_active_iter, 3579 &data); 3580 bfer_mvmsta = data.bfer_mvmsta; 3581 3582 /* This code is safe as it doesn't run concurrently for different 3583 * stations. This is guaranteed by the fact that calls to 3584 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3585 */ 3586 if (!bfer_mvmsta) { 3587 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3588 3589 ss_params |= LQ_SS_BFER_ALLOWED; 3590 goto out; 3591 } 3592 3593 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3594 bfer_mvmsta->sta_id); 3595 3596 /* Disallow BFER on another STA if active and we're a higher priority */ 3597 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3598 struct iwl_lq_cmd *bfersta_lq_cmd = 3599 &bfer_mvmsta->lq_sta.rs_drv.lq; 3600 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3601 3602 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3603 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3604 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd); 3605 3606 ss_params |= LQ_SS_BFER_ALLOWED; 3607 IWL_DEBUG_RATE(mvm, 3608 "Lower priority BFER sta found (%d). Switch BFER\n", 3609 bfer_mvmsta->sta_id); 3610 } 3611 out: 3612 lq_cmd->ss_params = cpu_to_le32(ss_params); 3613 } 3614 3615 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3616 struct ieee80211_sta *sta, 3617 struct iwl_lq_sta *lq_sta, 3618 const struct rs_rate *initial_rate) 3619 { 3620 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3621 struct iwl_mvm_sta *mvmsta; 3622 struct iwl_mvm_vif *mvmvif; 3623 3624 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3625 lq_cmd->agg_time_limit = 3626 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3627 3628 #ifdef CONFIG_MAC80211_DEBUGFS 3629 if (lq_sta->pers.dbg_fixed_rate) { 3630 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3631 lq_sta->band, 3632 lq_sta->pers.dbg_fixed_rate); 3633 return; 3634 } 3635 #endif 3636 if (WARN_ON_ONCE(!sta || !initial_rate)) 3637 return; 3638 3639 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3640 3641 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3642 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3643 3644 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3645 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3646 3647 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3648 num_of_ant(initial_rate->ant) == 1) 3649 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3650 3651 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3652 3653 /* 3654 * In case of low latency, tell the firmware to leave a frame in the 3655 * Tx Fifo so that it can start a transaction in the same TxOP. This 3656 * basically allows the firmware to send bursts. 3657 */ 3658 if (iwl_mvm_vif_low_latency(mvmvif)) 3659 lq_cmd->agg_frame_cnt_limit--; 3660 3661 if (mvmsta->vif->p2p) 3662 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3663 3664 lq_cmd->agg_time_limit = 3665 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3666 } 3667 3668 static void *rs_alloc(struct ieee80211_hw *hw) 3669 { 3670 return hw->priv; 3671 } 3672 3673 /* rate scale requires free function to be implemented */ 3674 static void rs_free(void *mvm_rate) 3675 { 3676 return; 3677 } 3678 3679 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3680 { 3681 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3682 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3683 3684 IWL_DEBUG_RATE(mvm, "enter\n"); 3685 IWL_DEBUG_RATE(mvm, "leave\n"); 3686 } 3687 3688 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3689 { 3690 3691 char *type, *bw; 3692 u8 mcs = 0, nss = 0; 3693 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3694 3695 if (!(rate & RATE_MCS_HT_MSK) && 3696 !(rate & RATE_MCS_VHT_MSK) && 3697 !(rate & RATE_MCS_HE_MSK)) { 3698 int index = iwl_hwrate_to_plcp_idx(rate); 3699 3700 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps", 3701 rs_pretty_ant(ant), 3702 index == IWL_RATE_INVALID ? "BAD" : 3703 iwl_rate_mcs[index].mbps); 3704 } 3705 3706 if (rate & RATE_MCS_VHT_MSK) { 3707 type = "VHT"; 3708 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3709 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3710 >> RATE_VHT_MCS_NSS_POS) + 1; 3711 } else if (rate & RATE_MCS_HT_MSK) { 3712 type = "HT"; 3713 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3714 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3715 >> RATE_HT_MCS_NSS_POS) + 1; 3716 } else if (rate & RATE_MCS_HE_MSK) { 3717 type = "HE"; 3718 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3719 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3720 >> RATE_VHT_MCS_NSS_POS) + 1; 3721 } else { 3722 type = "Unknown"; /* shouldn't happen */ 3723 } 3724 3725 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3726 case RATE_MCS_CHAN_WIDTH_20: 3727 bw = "20Mhz"; 3728 break; 3729 case RATE_MCS_CHAN_WIDTH_40: 3730 bw = "40Mhz"; 3731 break; 3732 case RATE_MCS_CHAN_WIDTH_80: 3733 bw = "80Mhz"; 3734 break; 3735 case RATE_MCS_CHAN_WIDTH_160: 3736 bw = "160Mhz"; 3737 break; 3738 default: 3739 bw = "BAD BW"; 3740 } 3741 3742 return scnprintf(buf, bufsz, 3743 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s", 3744 rate, type, rs_pretty_ant(ant), bw, mcs, nss, 3745 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3746 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3747 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3748 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3749 } 3750 3751 #ifdef CONFIG_MAC80211_DEBUGFS 3752 /** 3753 * Program the device to use fixed rate for frame transmit 3754 * This is for debugging/testing only 3755 * once the device start use fixed rate, we need to reload the module 3756 * to being back the normal operation. 3757 */ 3758 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3759 struct iwl_lq_sta *lq_sta) 3760 { 3761 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3762 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3763 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3764 3765 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3766 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3767 3768 if (lq_sta->pers.dbg_fixed_rate) { 3769 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3770 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq); 3771 } 3772 } 3773 3774 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3775 const char __user *user_buf, size_t count, loff_t *ppos) 3776 { 3777 struct iwl_lq_sta *lq_sta = file->private_data; 3778 struct iwl_mvm *mvm; 3779 char buf[64]; 3780 size_t buf_size; 3781 u32 parsed_rate; 3782 3783 mvm = lq_sta->pers.drv; 3784 memset(buf, 0, sizeof(buf)); 3785 buf_size = min(count, sizeof(buf) - 1); 3786 if (copy_from_user(buf, user_buf, buf_size)) 3787 return -EFAULT; 3788 3789 if (sscanf(buf, "%x", &parsed_rate) == 1) 3790 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3791 else 3792 lq_sta->pers.dbg_fixed_rate = 0; 3793 3794 rs_program_fix_rate(mvm, lq_sta); 3795 3796 return count; 3797 } 3798 3799 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3800 char __user *user_buf, size_t count, loff_t *ppos) 3801 { 3802 char *buff; 3803 int desc = 0; 3804 int i = 0; 3805 ssize_t ret; 3806 static const size_t bufsz = 2048; 3807 3808 struct iwl_lq_sta *lq_sta = file->private_data; 3809 struct iwl_mvm_sta *mvmsta = 3810 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3811 struct iwl_mvm *mvm; 3812 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3813 struct rs_rate *rate = &tbl->rate; 3814 u32 ss_params; 3815 3816 mvm = lq_sta->pers.drv; 3817 buff = kmalloc(bufsz, GFP_KERNEL); 3818 if (!buff) 3819 return -ENOMEM; 3820 3821 desc += scnprintf(buff + desc, bufsz - desc, 3822 "sta_id %d\n", lq_sta->lq.sta_id); 3823 desc += scnprintf(buff + desc, bufsz - desc, 3824 "failed=%d success=%d rate=0%lX\n", 3825 lq_sta->total_failed, lq_sta->total_success, 3826 lq_sta->active_legacy_rate); 3827 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3828 lq_sta->pers.dbg_fixed_rate); 3829 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3830 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3831 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3832 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3833 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3834 (is_legacy(rate)) ? "legacy" : 3835 is_vht(rate) ? "VHT" : "HT"); 3836 if (!is_legacy(rate)) { 3837 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3838 (is_siso(rate)) ? "SISO" : "MIMO2"); 3839 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3840 (is_ht20(rate)) ? "20MHz" : 3841 (is_ht40(rate)) ? "40MHz" : 3842 (is_ht80(rate)) ? "80MHz" : 3843 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3844 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3845 (rate->sgi) ? "SGI" : "NGI", 3846 (rate->ldpc) ? "LDPC" : "BCC", 3847 (lq_sta->is_agg) ? "AGG on" : "", 3848 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3849 } 3850 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3851 lq_sta->last_rate_n_flags); 3852 desc += scnprintf(buff + desc, bufsz - desc, 3853 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3854 lq_sta->lq.flags, 3855 lq_sta->lq.mimo_delim, 3856 lq_sta->lq.single_stream_ant_msk, 3857 lq_sta->lq.dual_stream_ant_msk); 3858 3859 desc += scnprintf(buff + desc, bufsz - desc, 3860 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3861 le16_to_cpu(lq_sta->lq.agg_time_limit), 3862 lq_sta->lq.agg_disable_start_th, 3863 lq_sta->lq.agg_frame_cnt_limit); 3864 3865 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3866 lq_sta->lq.reduced_tpc); 3867 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3868 desc += scnprintf(buff + desc, bufsz - desc, 3869 "single stream params: %s%s%s%s\n", 3870 (ss_params & LQ_SS_PARAMS_VALID) ? 3871 "VALID" : "INVALID", 3872 (ss_params & LQ_SS_BFER_ALLOWED) ? 3873 ", BFER" : "", 3874 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3875 ", STBC" : "", 3876 (ss_params & LQ_SS_FORCE) ? 3877 ", FORCE" : ""); 3878 desc += scnprintf(buff + desc, bufsz - desc, 3879 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3880 lq_sta->lq.initial_rate_index[0], 3881 lq_sta->lq.initial_rate_index[1], 3882 lq_sta->lq.initial_rate_index[2], 3883 lq_sta->lq.initial_rate_index[3]); 3884 3885 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3886 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3887 3888 desc += scnprintf(buff + desc, bufsz - desc, 3889 " rate[%d] 0x%X ", i, r); 3890 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3891 if (desc < bufsz - 1) 3892 buff[desc++] = '\n'; 3893 } 3894 3895 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3896 kfree(buff); 3897 return ret; 3898 } 3899 3900 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3901 .write = rs_sta_dbgfs_scale_table_write, 3902 .read = rs_sta_dbgfs_scale_table_read, 3903 .open = simple_open, 3904 .llseek = default_llseek, 3905 }; 3906 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3907 char __user *user_buf, size_t count, loff_t *ppos) 3908 { 3909 char *buff; 3910 int desc = 0; 3911 int i, j; 3912 ssize_t ret; 3913 struct iwl_scale_tbl_info *tbl; 3914 struct rs_rate *rate; 3915 struct iwl_lq_sta *lq_sta = file->private_data; 3916 3917 buff = kmalloc(1024, GFP_KERNEL); 3918 if (!buff) 3919 return -ENOMEM; 3920 3921 for (i = 0; i < LQ_SIZE; i++) { 3922 tbl = &(lq_sta->lq_info[i]); 3923 rate = &tbl->rate; 3924 desc += sprintf(buff+desc, 3925 "%s type=%d SGI=%d BW=%s DUP=0\n" 3926 "index=%d\n", 3927 lq_sta->active_tbl == i ? "*" : "x", 3928 rate->type, 3929 rate->sgi, 3930 is_ht20(rate) ? "20MHz" : 3931 is_ht40(rate) ? "40MHz" : 3932 is_ht80(rate) ? "80MHz" : 3933 is_ht160(rate) ? "160MHz" : "ERR", 3934 rate->index); 3935 for (j = 0; j < IWL_RATE_COUNT; j++) { 3936 desc += sprintf(buff+desc, 3937 "counter=%d success=%d %%=%d\n", 3938 tbl->win[j].counter, 3939 tbl->win[j].success_counter, 3940 tbl->win[j].success_ratio); 3941 } 3942 } 3943 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3944 kfree(buff); 3945 return ret; 3946 } 3947 3948 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3949 .read = rs_sta_dbgfs_stats_table_read, 3950 .open = simple_open, 3951 .llseek = default_llseek, 3952 }; 3953 3954 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3955 char __user *user_buf, 3956 size_t count, loff_t *ppos) 3957 { 3958 static const char * const column_name[] = { 3959 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3960 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3961 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3962 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3963 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3964 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3965 [RS_COLUMN_MIMO2] = "MIMO2", 3966 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3967 }; 3968 3969 static const char * const rate_name[] = { 3970 [IWL_RATE_1M_INDEX] = "1M", 3971 [IWL_RATE_2M_INDEX] = "2M", 3972 [IWL_RATE_5M_INDEX] = "5.5M", 3973 [IWL_RATE_11M_INDEX] = "11M", 3974 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3975 [IWL_RATE_9M_INDEX] = "9M", 3976 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3977 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3978 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3979 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3980 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3981 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3982 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3983 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3984 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3985 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3986 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3987 }; 3988 3989 char *buff, *pos, *endpos; 3990 int col, rate; 3991 ssize_t ret; 3992 struct iwl_lq_sta *lq_sta = file->private_data; 3993 struct rs_rate_stats *stats; 3994 static const size_t bufsz = 1024; 3995 3996 buff = kmalloc(bufsz, GFP_KERNEL); 3997 if (!buff) 3998 return -ENOMEM; 3999 4000 pos = buff; 4001 endpos = pos + bufsz; 4002 4003 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 4004 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 4005 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 4006 pos += scnprintf(pos, endpos - pos, "\n"); 4007 4008 for (col = 0; col < RS_COLUMN_COUNT; col++) { 4009 pos += scnprintf(pos, endpos - pos, 4010 "%s,", column_name[col]); 4011 4012 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 4013 stats = &(lq_sta->pers.tx_stats[col][rate]); 4014 pos += scnprintf(pos, endpos - pos, 4015 "%llu/%llu,", 4016 stats->success, 4017 stats->total); 4018 } 4019 pos += scnprintf(pos, endpos - pos, "\n"); 4020 } 4021 4022 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 4023 kfree(buff); 4024 return ret; 4025 } 4026 4027 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 4028 const char __user *user_buf, 4029 size_t count, loff_t *ppos) 4030 { 4031 struct iwl_lq_sta *lq_sta = file->private_data; 4032 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 4033 4034 return count; 4035 } 4036 4037 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 4038 .read = rs_sta_dbgfs_drv_tx_stats_read, 4039 .write = rs_sta_dbgfs_drv_tx_stats_write, 4040 .open = simple_open, 4041 .llseek = default_llseek, 4042 }; 4043 4044 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 4045 char __user *user_buf, 4046 size_t count, loff_t *ppos) 4047 { 4048 struct iwl_lq_sta *lq_sta = file->private_data; 4049 char buf[12]; 4050 int bufsz = sizeof(buf); 4051 int pos = 0; 4052 static const char * const ss_force_name[] = { 4053 [RS_SS_FORCE_NONE] = "none", 4054 [RS_SS_FORCE_STBC] = "stbc", 4055 [RS_SS_FORCE_BFER] = "bfer", 4056 [RS_SS_FORCE_SISO] = "siso", 4057 }; 4058 4059 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4060 ss_force_name[lq_sta->pers.ss_force]); 4061 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4062 } 4063 4064 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4065 size_t count, loff_t *ppos) 4066 { 4067 struct iwl_mvm *mvm = lq_sta->pers.drv; 4068 int ret = 0; 4069 4070 if (!strncmp("none", buf, 4)) { 4071 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4072 } else if (!strncmp("siso", buf, 4)) { 4073 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4074 } else if (!strncmp("stbc", buf, 4)) { 4075 if (lq_sta->stbc_capable) { 4076 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4077 } else { 4078 IWL_ERR(mvm, 4079 "can't force STBC. peer doesn't support\n"); 4080 ret = -EINVAL; 4081 } 4082 } else if (!strncmp("bfer", buf, 4)) { 4083 if (lq_sta->bfer_capable) { 4084 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4085 } else { 4086 IWL_ERR(mvm, 4087 "can't force BFER. peer doesn't support\n"); 4088 ret = -EINVAL; 4089 } 4090 } else { 4091 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4092 ret = -EINVAL; 4093 } 4094 return ret ?: count; 4095 } 4096 4097 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4098 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4099 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4100 debugfs_create_file(#name, mode, parent, lq_sta, \ 4101 &iwl_dbgfs_##name##_ops); \ 4102 } while (0) 4103 4104 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4105 4106 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4107 struct dentry *dir) 4108 { 4109 struct iwl_lq_sta *lq_sta = priv_sta; 4110 struct iwl_mvm_sta *mvmsta; 4111 4112 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4113 4114 if (!mvmsta->vif) 4115 return; 4116 4117 debugfs_create_file("rate_scale_table", 0600, dir, 4118 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4119 debugfs_create_file("rate_stats_table", 0400, dir, 4120 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4121 debugfs_create_file("drv_tx_stats", 0600, dir, 4122 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4123 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4124 &lq_sta->tx_agg_tid_en); 4125 debugfs_create_u8("reduced_tpc", 0600, dir, 4126 &lq_sta->pers.dbg_fixed_txp_reduction); 4127 4128 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4129 } 4130 #endif 4131 4132 /* 4133 * Initialization of rate scaling information is done by driver after 4134 * the station is added. Since mac80211 calls this function before a 4135 * station is added we ignore it. 4136 */ 4137 static void rs_rate_init_ops(void *mvm_r, 4138 struct ieee80211_supported_band *sband, 4139 struct cfg80211_chan_def *chandef, 4140 struct ieee80211_sta *sta, void *mvm_sta) 4141 { 4142 } 4143 4144 /* ops for rate scaling implemented in the driver */ 4145 static const struct rate_control_ops rs_mvm_ops_drv = { 4146 .name = RS_NAME, 4147 .tx_status = rs_drv_mac80211_tx_status, 4148 .get_rate = rs_drv_get_rate, 4149 .rate_init = rs_rate_init_ops, 4150 .alloc = rs_alloc, 4151 .free = rs_free, 4152 .alloc_sta = rs_drv_alloc_sta, 4153 .free_sta = rs_free_sta, 4154 .rate_update = rs_drv_rate_update, 4155 #ifdef CONFIG_MAC80211_DEBUGFS 4156 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4157 #endif 4158 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4159 }; 4160 4161 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4162 enum nl80211_band band, bool update) 4163 { 4164 if (iwl_mvm_has_tlc_offload(mvm)) { 4165 rs_fw_rate_init(mvm, sta, band, update); 4166 } else { 4167 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 4168 4169 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock); 4170 rs_drv_rate_init(mvm, sta, band); 4171 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 4172 } 4173 } 4174 4175 int iwl_mvm_rate_control_register(void) 4176 { 4177 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4178 } 4179 4180 void iwl_mvm_rate_control_unregister(void) 4181 { 4182 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4183 } 4184 4185 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4186 bool enable) 4187 { 4188 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4189 4190 lockdep_assert_held(&mvm->mutex); 4191 4192 if (enable) { 4193 if (mvmsta->tx_protection == 0) 4194 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4195 mvmsta->tx_protection++; 4196 } else { 4197 mvmsta->tx_protection--; 4198 if (mvmsta->tx_protection == 0) 4199 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4200 } 4201 4202 return iwl_mvm_send_lq_cmd(mvm, lq); 4203 } 4204 4205 /** 4206 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4207 * @mvmsta: The station 4208 * @enable: Enable Tx protection? 4209 */ 4210 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4211 bool enable) 4212 { 4213 if (iwl_mvm_has_tlc_offload(mvm)) 4214 return rs_fw_tx_protection(mvm, mvmsta, enable); 4215 else 4216 return rs_drv_tx_protection(mvm, mvmsta, enable); 4217 } 4218