1 // SPDX-License-Identifier: GPL-2.0-only 2 /****************************************************************************** 3 * 4 * Copyright(c) 2005 - 2014, 2018 - 2020 Intel Corporation. All rights reserved. 5 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 6 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH 7 * 8 * Contact Information: 9 * Intel Linux Wireless <linuxwifi@intel.com> 10 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 11 * 12 *****************************************************************************/ 13 #include <linux/kernel.h> 14 #include <linux/skbuff.h> 15 #include <linux/slab.h> 16 #include <net/mac80211.h> 17 18 #include <linux/netdevice.h> 19 #include <linux/etherdevice.h> 20 #include <linux/delay.h> 21 22 #include <linux/workqueue.h> 23 #include "rs.h" 24 #include "fw-api.h" 25 #include "sta.h" 26 #include "iwl-op-mode.h" 27 #include "mvm.h" 28 #include "debugfs.h" 29 30 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */ 31 32 /* Calculations of success ratio are done in fixed point where 12800 is 100%. 33 * Use this macro when dealing with thresholds consts set as a percentage 34 */ 35 #define RS_PERCENT(x) (128 * x) 36 37 static u8 rs_ht_to_legacy[] = { 38 [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX, 39 [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX, 40 [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX, 41 [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX, 42 [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX, 43 [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX, 44 [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX, 45 [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX, 46 [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX, 47 [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX, 48 }; 49 50 static const u8 ant_toggle_lookup[] = { 51 [ANT_NONE] = ANT_NONE, 52 [ANT_A] = ANT_B, 53 [ANT_B] = ANT_A, 54 [ANT_AB] = ANT_AB, 55 }; 56 57 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn) \ 58 [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP, \ 59 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 60 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 61 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 62 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\ 63 IWL_RATE_##rp##M_INDEX, \ 64 IWL_RATE_##rn##M_INDEX } 65 66 #define IWL_DECLARE_MCS_RATE(s) \ 67 [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP, \ 68 IWL_RATE_HT_SISO_MCS_##s##_PLCP, \ 69 IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \ 70 IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \ 71 IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \ 72 IWL_RATE_INVM_INDEX, \ 73 IWL_RATE_INVM_INDEX } 74 75 /* 76 * Parameter order: 77 * rate, ht rate, prev rate, next rate 78 * 79 * If there isn't a valid next or previous rate then INV is used which 80 * maps to IWL_RATE_INVALID 81 * 82 */ 83 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = { 84 IWL_DECLARE_RATE_INFO(1, INV, INV, 2), /* 1mbps */ 85 IWL_DECLARE_RATE_INFO(2, INV, 1, 5), /* 2mbps */ 86 IWL_DECLARE_RATE_INFO(5, INV, 2, 11), /*5.5mbps */ 87 IWL_DECLARE_RATE_INFO(11, INV, 9, 12), /* 11mbps */ 88 IWL_DECLARE_RATE_INFO(6, 0, 5, 11), /* 6mbps ; MCS 0 */ 89 IWL_DECLARE_RATE_INFO(9, INV, 6, 11), /* 9mbps */ 90 IWL_DECLARE_RATE_INFO(12, 1, 11, 18), /* 12mbps ; MCS 1 */ 91 IWL_DECLARE_RATE_INFO(18, 2, 12, 24), /* 18mbps ; MCS 2 */ 92 IWL_DECLARE_RATE_INFO(24, 3, 18, 36), /* 24mbps ; MCS 3 */ 93 IWL_DECLARE_RATE_INFO(36, 4, 24, 48), /* 36mbps ; MCS 4 */ 94 IWL_DECLARE_RATE_INFO(48, 5, 36, 54), /* 48mbps ; MCS 5 */ 95 IWL_DECLARE_RATE_INFO(54, 6, 48, INV), /* 54mbps ; MCS 6 */ 96 IWL_DECLARE_MCS_RATE(7), /* MCS 7 */ 97 IWL_DECLARE_MCS_RATE(8), /* MCS 8 */ 98 IWL_DECLARE_MCS_RATE(9), /* MCS 9 */ 99 }; 100 101 enum rs_action { 102 RS_ACTION_STAY = 0, 103 RS_ACTION_DOWNSCALE = -1, 104 RS_ACTION_UPSCALE = 1, 105 }; 106 107 enum rs_column_mode { 108 RS_INVALID = 0, 109 RS_LEGACY, 110 RS_SISO, 111 RS_MIMO2, 112 }; 113 114 #define MAX_NEXT_COLUMNS 7 115 #define MAX_COLUMN_CHECKS 3 116 117 struct rs_tx_column; 118 119 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm, 120 struct ieee80211_sta *sta, 121 struct rs_rate *rate, 122 const struct rs_tx_column *next_col); 123 124 struct rs_tx_column { 125 enum rs_column_mode mode; 126 u8 ant; 127 bool sgi; 128 enum rs_column next_columns[MAX_NEXT_COLUMNS]; 129 allow_column_func_t checks[MAX_COLUMN_CHECKS]; 130 }; 131 132 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 133 struct rs_rate *rate, 134 const struct rs_tx_column *next_col) 135 { 136 return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant); 137 } 138 139 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 140 struct rs_rate *rate, 141 const struct rs_tx_column *next_col) 142 { 143 if (!sta->ht_cap.ht_supported) 144 return false; 145 146 if (sta->smps_mode == IEEE80211_SMPS_STATIC) 147 return false; 148 149 if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2) 150 return false; 151 152 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 153 return false; 154 155 if (mvm->nvm_data->sku_cap_mimo_disabled) 156 return false; 157 158 return true; 159 } 160 161 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 162 struct rs_rate *rate, 163 const struct rs_tx_column *next_col) 164 { 165 if (!sta->ht_cap.ht_supported) 166 return false; 167 168 return true; 169 } 170 171 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 172 struct rs_rate *rate, 173 const struct rs_tx_column *next_col) 174 { 175 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 176 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 177 178 if (is_ht20(rate) && (ht_cap->cap & 179 IEEE80211_HT_CAP_SGI_20)) 180 return true; 181 if (is_ht40(rate) && (ht_cap->cap & 182 IEEE80211_HT_CAP_SGI_40)) 183 return true; 184 if (is_ht80(rate) && (vht_cap->cap & 185 IEEE80211_VHT_CAP_SHORT_GI_80)) 186 return true; 187 if (is_ht160(rate) && (vht_cap->cap & 188 IEEE80211_VHT_CAP_SHORT_GI_160)) 189 return true; 190 191 return false; 192 } 193 194 static const struct rs_tx_column rs_tx_columns[] = { 195 [RS_COLUMN_LEGACY_ANT_A] = { 196 .mode = RS_LEGACY, 197 .ant = ANT_A, 198 .next_columns = { 199 RS_COLUMN_LEGACY_ANT_B, 200 RS_COLUMN_SISO_ANT_A, 201 RS_COLUMN_MIMO2, 202 RS_COLUMN_INVALID, 203 RS_COLUMN_INVALID, 204 RS_COLUMN_INVALID, 205 RS_COLUMN_INVALID, 206 }, 207 .checks = { 208 rs_ant_allow, 209 }, 210 }, 211 [RS_COLUMN_LEGACY_ANT_B] = { 212 .mode = RS_LEGACY, 213 .ant = ANT_B, 214 .next_columns = { 215 RS_COLUMN_LEGACY_ANT_A, 216 RS_COLUMN_SISO_ANT_B, 217 RS_COLUMN_MIMO2, 218 RS_COLUMN_INVALID, 219 RS_COLUMN_INVALID, 220 RS_COLUMN_INVALID, 221 RS_COLUMN_INVALID, 222 }, 223 .checks = { 224 rs_ant_allow, 225 }, 226 }, 227 [RS_COLUMN_SISO_ANT_A] = { 228 .mode = RS_SISO, 229 .ant = ANT_A, 230 .next_columns = { 231 RS_COLUMN_SISO_ANT_B, 232 RS_COLUMN_MIMO2, 233 RS_COLUMN_SISO_ANT_A_SGI, 234 RS_COLUMN_LEGACY_ANT_A, 235 RS_COLUMN_LEGACY_ANT_B, 236 RS_COLUMN_INVALID, 237 RS_COLUMN_INVALID, 238 }, 239 .checks = { 240 rs_siso_allow, 241 rs_ant_allow, 242 }, 243 }, 244 [RS_COLUMN_SISO_ANT_B] = { 245 .mode = RS_SISO, 246 .ant = ANT_B, 247 .next_columns = { 248 RS_COLUMN_SISO_ANT_A, 249 RS_COLUMN_MIMO2, 250 RS_COLUMN_SISO_ANT_B_SGI, 251 RS_COLUMN_LEGACY_ANT_A, 252 RS_COLUMN_LEGACY_ANT_B, 253 RS_COLUMN_INVALID, 254 RS_COLUMN_INVALID, 255 }, 256 .checks = { 257 rs_siso_allow, 258 rs_ant_allow, 259 }, 260 }, 261 [RS_COLUMN_SISO_ANT_A_SGI] = { 262 .mode = RS_SISO, 263 .ant = ANT_A, 264 .sgi = true, 265 .next_columns = { 266 RS_COLUMN_SISO_ANT_B_SGI, 267 RS_COLUMN_MIMO2_SGI, 268 RS_COLUMN_SISO_ANT_A, 269 RS_COLUMN_LEGACY_ANT_A, 270 RS_COLUMN_LEGACY_ANT_B, 271 RS_COLUMN_INVALID, 272 RS_COLUMN_INVALID, 273 }, 274 .checks = { 275 rs_siso_allow, 276 rs_ant_allow, 277 rs_sgi_allow, 278 }, 279 }, 280 [RS_COLUMN_SISO_ANT_B_SGI] = { 281 .mode = RS_SISO, 282 .ant = ANT_B, 283 .sgi = true, 284 .next_columns = { 285 RS_COLUMN_SISO_ANT_A_SGI, 286 RS_COLUMN_MIMO2_SGI, 287 RS_COLUMN_SISO_ANT_B, 288 RS_COLUMN_LEGACY_ANT_A, 289 RS_COLUMN_LEGACY_ANT_B, 290 RS_COLUMN_INVALID, 291 RS_COLUMN_INVALID, 292 }, 293 .checks = { 294 rs_siso_allow, 295 rs_ant_allow, 296 rs_sgi_allow, 297 }, 298 }, 299 [RS_COLUMN_MIMO2] = { 300 .mode = RS_MIMO2, 301 .ant = ANT_AB, 302 .next_columns = { 303 RS_COLUMN_SISO_ANT_A, 304 RS_COLUMN_MIMO2_SGI, 305 RS_COLUMN_LEGACY_ANT_A, 306 RS_COLUMN_LEGACY_ANT_B, 307 RS_COLUMN_INVALID, 308 RS_COLUMN_INVALID, 309 RS_COLUMN_INVALID, 310 }, 311 .checks = { 312 rs_mimo_allow, 313 }, 314 }, 315 [RS_COLUMN_MIMO2_SGI] = { 316 .mode = RS_MIMO2, 317 .ant = ANT_AB, 318 .sgi = true, 319 .next_columns = { 320 RS_COLUMN_SISO_ANT_A_SGI, 321 RS_COLUMN_MIMO2, 322 RS_COLUMN_LEGACY_ANT_A, 323 RS_COLUMN_LEGACY_ANT_B, 324 RS_COLUMN_INVALID, 325 RS_COLUMN_INVALID, 326 RS_COLUMN_INVALID, 327 }, 328 .checks = { 329 rs_mimo_allow, 330 rs_sgi_allow, 331 }, 332 }, 333 }; 334 335 static inline u8 rs_extract_rate(u32 rate_n_flags) 336 { 337 /* also works for HT because bits 7:6 are zero there */ 338 return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK); 339 } 340 341 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags) 342 { 343 int idx = 0; 344 345 if (rate_n_flags & RATE_MCS_HT_MSK) { 346 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK; 347 idx += IWL_RATE_MCS_0_INDEX; 348 349 /* skip 9M not supported in HT*/ 350 if (idx >= IWL_RATE_9M_INDEX) 351 idx += 1; 352 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE)) 353 return idx; 354 } else if (rate_n_flags & RATE_MCS_VHT_MSK || 355 rate_n_flags & RATE_MCS_HE_MSK) { 356 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 357 idx += IWL_RATE_MCS_0_INDEX; 358 359 /* skip 9M not supported in VHT*/ 360 if (idx >= IWL_RATE_9M_INDEX) 361 idx++; 362 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE)) 363 return idx; 364 if ((rate_n_flags & RATE_MCS_HE_MSK) && 365 (idx <= IWL_LAST_HE_RATE)) 366 return idx; 367 } else { 368 /* legacy rate format, search for match in table */ 369 370 u8 legacy_rate = rs_extract_rate(rate_n_flags); 371 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++) 372 if (iwl_rates[idx].plcp == legacy_rate) 373 return idx; 374 } 375 376 return IWL_RATE_INVALID; 377 } 378 379 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 380 struct ieee80211_sta *sta, 381 struct iwl_lq_sta *lq_sta, 382 int tid, bool ndp); 383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 384 struct ieee80211_sta *sta, 385 struct iwl_lq_sta *lq_sta, 386 const struct rs_rate *initial_rate); 387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search); 388 389 /* 390 * The following tables contain the expected throughput metrics for all rates 391 * 392 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits 393 * 394 * where invalid entries are zeros. 395 * 396 * CCK rates are only valid in legacy table and will only be used in G 397 * (2.4 GHz) band. 398 */ 399 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = { 400 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0 401 }; 402 403 /* Expected TpT tables. 4 indexes: 404 * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI 405 */ 406 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = { 407 {0, 0, 0, 0, 42, 0, 76, 102, 124, 159, 183, 193, 202, 216, 0}, 408 {0, 0, 0, 0, 46, 0, 82, 110, 132, 168, 192, 202, 210, 225, 0}, 409 {0, 0, 0, 0, 49, 0, 97, 145, 192, 285, 375, 420, 464, 551, 0}, 410 {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0}, 411 }; 412 413 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = { 414 {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257, 269, 275}, 415 {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264, 275, 280}, 416 {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828, 911, 1070, 1173}, 417 {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284}, 418 }; 419 420 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = { 421 {0, 0, 0, 0, 130, 0, 191, 223, 244, 273, 288, 294, 298, 305, 308}, 422 {0, 0, 0, 0, 138, 0, 200, 231, 251, 279, 293, 298, 302, 308, 312}, 423 {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466}, 424 {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691}, 425 }; 426 427 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = { 428 {0, 0, 0, 0, 191, 0, 244, 288, 298, 308, 313, 318, 323, 328, 330}, 429 {0, 0, 0, 0, 200, 0, 251, 293, 302, 312, 317, 322, 327, 332, 334}, 430 {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581}, 431 {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165}, 432 }; 433 434 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = { 435 {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250, 261, 0}, 436 {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256, 267, 0}, 437 {0, 0, 0, 0, 98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0}, 438 {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0}, 439 }; 440 441 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = { 442 {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289, 296, 300}, 443 {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293, 300, 303}, 444 {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053}, 445 {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221}, 446 }; 447 448 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = { 449 {0, 0, 0, 0, 182, 0, 240, 264, 278, 299, 308, 311, 313, 317, 319}, 450 {0, 0, 0, 0, 190, 0, 247, 269, 282, 302, 310, 313, 315, 319, 320}, 451 {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219}, 452 {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545}, 453 }; 454 455 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = { 456 {0, 0, 0, 0, 240, 0, 278, 308, 313, 319, 322, 324, 328, 330, 334}, 457 {0, 0, 0, 0, 247, 0, 282, 310, 315, 320, 323, 325, 329, 332, 338}, 458 {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629, 10592}, 459 {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640}, 460 }; 461 462 /* mbps, mcs */ 463 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = { 464 { "1", "BPSK DSSS"}, 465 { "2", "QPSK DSSS"}, 466 {"5.5", "BPSK CCK"}, 467 { "11", "QPSK CCK"}, 468 { "6", "BPSK 1/2"}, 469 { "9", "BPSK 1/2"}, 470 { "12", "QPSK 1/2"}, 471 { "18", "QPSK 3/4"}, 472 { "24", "16QAM 1/2"}, 473 { "36", "16QAM 3/4"}, 474 { "48", "64QAM 2/3"}, 475 { "54", "64QAM 3/4"}, 476 { "60", "64QAM 5/6"}, 477 }; 478 479 #define MCS_INDEX_PER_STREAM (8) 480 481 static const char *rs_pretty_ant(u8 ant) 482 { 483 static const char * const ant_name[] = { 484 [ANT_NONE] = "None", 485 [ANT_A] = "A", 486 [ANT_B] = "B", 487 [ANT_AB] = "AB", 488 [ANT_C] = "C", 489 [ANT_AC] = "AC", 490 [ANT_BC] = "BC", 491 [ANT_ABC] = "ABC", 492 }; 493 494 if (ant > ANT_ABC) 495 return "UNKNOWN"; 496 497 return ant_name[ant]; 498 } 499 500 static const char *rs_pretty_lq_type(enum iwl_table_type type) 501 { 502 static const char * const lq_types[] = { 503 [LQ_NONE] = "NONE", 504 [LQ_LEGACY_A] = "LEGACY_A", 505 [LQ_LEGACY_G] = "LEGACY_G", 506 [LQ_HT_SISO] = "HT SISO", 507 [LQ_HT_MIMO2] = "HT MIMO", 508 [LQ_VHT_SISO] = "VHT SISO", 509 [LQ_VHT_MIMO2] = "VHT MIMO", 510 [LQ_HE_SISO] = "HE SISO", 511 [LQ_HE_MIMO2] = "HE MIMO", 512 }; 513 514 if (type < LQ_NONE || type >= LQ_MAX) 515 return "UNKNOWN"; 516 517 return lq_types[type]; 518 } 519 520 static char *rs_pretty_rate(const struct rs_rate *rate) 521 { 522 static char buf[40]; 523 static const char * const legacy_rates[] = { 524 [IWL_RATE_1M_INDEX] = "1M", 525 [IWL_RATE_2M_INDEX] = "2M", 526 [IWL_RATE_5M_INDEX] = "5.5M", 527 [IWL_RATE_11M_INDEX] = "11M", 528 [IWL_RATE_6M_INDEX] = "6M", 529 [IWL_RATE_9M_INDEX] = "9M", 530 [IWL_RATE_12M_INDEX] = "12M", 531 [IWL_RATE_18M_INDEX] = "18M", 532 [IWL_RATE_24M_INDEX] = "24M", 533 [IWL_RATE_36M_INDEX] = "36M", 534 [IWL_RATE_48M_INDEX] = "48M", 535 [IWL_RATE_54M_INDEX] = "54M", 536 }; 537 static const char *const ht_vht_rates[] = { 538 [IWL_RATE_MCS_0_INDEX] = "MCS0", 539 [IWL_RATE_MCS_1_INDEX] = "MCS1", 540 [IWL_RATE_MCS_2_INDEX] = "MCS2", 541 [IWL_RATE_MCS_3_INDEX] = "MCS3", 542 [IWL_RATE_MCS_4_INDEX] = "MCS4", 543 [IWL_RATE_MCS_5_INDEX] = "MCS5", 544 [IWL_RATE_MCS_6_INDEX] = "MCS6", 545 [IWL_RATE_MCS_7_INDEX] = "MCS7", 546 [IWL_RATE_MCS_8_INDEX] = "MCS8", 547 [IWL_RATE_MCS_9_INDEX] = "MCS9", 548 }; 549 const char *rate_str; 550 551 if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX)) 552 rate_str = legacy_rates[rate->index]; 553 else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) && 554 (rate->index >= IWL_RATE_MCS_0_INDEX) && 555 (rate->index <= IWL_RATE_MCS_9_INDEX)) 556 rate_str = ht_vht_rates[rate->index]; 557 else 558 rate_str = "BAD_RATE"; 559 560 sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type), 561 rs_pretty_ant(rate->ant), rate_str); 562 return buf; 563 } 564 565 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate, 566 const char *prefix) 567 { 568 IWL_DEBUG_RATE(mvm, 569 "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n", 570 prefix, rs_pretty_rate(rate), rate->bw, 571 rate->sgi, rate->ldpc, rate->stbc); 572 } 573 574 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window) 575 { 576 window->data = 0; 577 window->success_counter = 0; 578 window->success_ratio = IWL_INVALID_VALUE; 579 window->counter = 0; 580 window->average_tpt = IWL_INVALID_VALUE; 581 } 582 583 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm, 584 struct iwl_scale_tbl_info *tbl) 585 { 586 int i; 587 588 IWL_DEBUG_RATE(mvm, "Clearing up window stats\n"); 589 for (i = 0; i < IWL_RATE_COUNT; i++) 590 rs_rate_scale_clear_window(&tbl->win[i]); 591 592 for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++) 593 rs_rate_scale_clear_window(&tbl->tpc_win[i]); 594 } 595 596 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type) 597 { 598 return (ant_type & valid_antenna) == ant_type; 599 } 600 601 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm, 602 struct iwl_lq_sta *lq_data, u8 tid, 603 struct ieee80211_sta *sta) 604 { 605 int ret; 606 607 IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n", 608 sta->addr, tid); 609 610 /* start BA session until the peer sends del BA */ 611 ret = ieee80211_start_tx_ba_session(sta, tid, 0); 612 if (ret == -EAGAIN) { 613 /* 614 * driver and mac80211 is out of sync 615 * this might be cause by reloading firmware 616 * stop the tx ba session here 617 */ 618 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n", 619 tid); 620 ieee80211_stop_tx_ba_session(sta, tid); 621 } 622 return ret; 623 } 624 625 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 626 u8 tid, struct iwl_lq_sta *lq_sta, 627 struct ieee80211_sta *sta) 628 { 629 struct iwl_mvm_tid_data *tid_data; 630 631 /* 632 * In AP mode, tid can be equal to IWL_MAX_TID_COUNT 633 * when the frame is not QoS 634 */ 635 if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) { 636 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n", 637 tid, IWL_MAX_TID_COUNT); 638 return; 639 } else if (tid == IWL_MAX_TID_COUNT) { 640 return; 641 } 642 643 tid_data = &mvmsta->tid_data[tid]; 644 if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED && 645 tid_data->state == IWL_AGG_OFF && 646 (lq_sta->tx_agg_tid_en & BIT(tid)) && 647 tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) { 648 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid); 649 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0) 650 tid_data->state = IWL_AGG_QUEUED; 651 } 652 } 653 654 static inline int get_num_of_ant_from_rate(u32 rate_n_flags) 655 { 656 return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) + 657 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) + 658 !!(rate_n_flags & RATE_MCS_ANT_C_MSK); 659 } 660 661 /* 662 * Static function to get the expected throughput from an iwl_scale_tbl_info 663 * that wraps a NULL pointer check 664 */ 665 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index) 666 { 667 if (tbl->expected_tpt) 668 return tbl->expected_tpt[rs_index]; 669 return 0; 670 } 671 672 /* 673 * rs_collect_tx_data - Update the success/failure sliding window 674 * 675 * We keep a sliding window of the last 62 packets transmitted 676 * at this rate. window->data contains the bitmask of successful 677 * packets. 678 */ 679 static int _rs_collect_tx_data(struct iwl_mvm *mvm, 680 struct iwl_scale_tbl_info *tbl, 681 int scale_index, int attempts, int successes, 682 struct iwl_rate_scale_data *window) 683 { 684 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1)); 685 s32 fail_count, tpt; 686 687 /* Get expected throughput */ 688 tpt = get_expected_tpt(tbl, scale_index); 689 690 /* 691 * Keep track of only the latest 62 tx frame attempts in this rate's 692 * history window; anything older isn't really relevant any more. 693 * If we have filled up the sliding window, drop the oldest attempt; 694 * if the oldest attempt (highest bit in bitmap) shows "success", 695 * subtract "1" from the success counter (this is the main reason 696 * we keep these bitmaps!). 697 */ 698 while (attempts > 0) { 699 if (window->counter >= IWL_RATE_MAX_WINDOW) { 700 /* remove earliest */ 701 window->counter = IWL_RATE_MAX_WINDOW - 1; 702 703 if (window->data & mask) { 704 window->data &= ~mask; 705 window->success_counter--; 706 } 707 } 708 709 /* Increment frames-attempted counter */ 710 window->counter++; 711 712 /* Shift bitmap by one frame to throw away oldest history */ 713 window->data <<= 1; 714 715 /* Mark the most recent #successes attempts as successful */ 716 if (successes > 0) { 717 window->success_counter++; 718 window->data |= 0x1; 719 successes--; 720 } 721 722 attempts--; 723 } 724 725 /* Calculate current success ratio, avoid divide-by-0! */ 726 if (window->counter > 0) 727 window->success_ratio = 128 * (100 * window->success_counter) 728 / window->counter; 729 else 730 window->success_ratio = IWL_INVALID_VALUE; 731 732 fail_count = window->counter - window->success_counter; 733 734 /* Calculate average throughput, if we have enough history. */ 735 if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) || 736 (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) 737 window->average_tpt = (window->success_ratio * tpt + 64) / 128; 738 else 739 window->average_tpt = IWL_INVALID_VALUE; 740 741 return 0; 742 } 743 744 static int rs_collect_tpc_data(struct iwl_mvm *mvm, 745 struct iwl_lq_sta *lq_sta, 746 struct iwl_scale_tbl_info *tbl, 747 int scale_index, int attempts, int successes, 748 u8 reduced_txp) 749 { 750 struct iwl_rate_scale_data *window = NULL; 751 752 if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION)) 753 return -EINVAL; 754 755 window = &tbl->tpc_win[reduced_txp]; 756 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 757 window); 758 } 759 760 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm, 761 struct iwl_mvm_sta *mvmsta, 762 u8 tid, int successes) 763 { 764 struct iwl_mvm_tid_data *tid_data; 765 766 if (tid >= IWL_MAX_TID_COUNT) 767 return; 768 769 tid_data = &mvmsta->tid_data[tid]; 770 771 /* 772 * Measure if there're enough successful transmits per second. 773 * These statistics are used only to decide if we can start a 774 * BA session, so it should be updated only when A-MPDU is 775 * off. 776 */ 777 if (tid_data->state != IWL_AGG_OFF) 778 return; 779 780 if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) || 781 (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) { 782 tid_data->tx_count_last = tid_data->tx_count; 783 tid_data->tx_count = 0; 784 tid_data->tpt_meas_start = jiffies; 785 } else { 786 tid_data->tx_count += successes; 787 } 788 } 789 790 static int rs_collect_tlc_data(struct iwl_mvm *mvm, 791 struct iwl_mvm_sta *mvmsta, u8 tid, 792 struct iwl_scale_tbl_info *tbl, 793 int scale_index, int attempts, int successes) 794 { 795 struct iwl_rate_scale_data *window = NULL; 796 797 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT) 798 return -EINVAL; 799 800 if (tbl->column != RS_COLUMN_INVALID) { 801 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers; 802 803 pers->tx_stats[tbl->column][scale_index].total += attempts; 804 pers->tx_stats[tbl->column][scale_index].success += successes; 805 } 806 807 rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes); 808 809 /* Select window for current tx bit rate */ 810 window = &(tbl->win[scale_index]); 811 return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes, 812 window); 813 } 814 815 /* Convert rs_rate object into ucode rate bitmask */ 816 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm, 817 struct rs_rate *rate) 818 { 819 u32 ucode_rate = 0; 820 int index = rate->index; 821 822 ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) & 823 RATE_MCS_ANT_ABC_MSK); 824 825 if (is_legacy(rate)) { 826 ucode_rate |= iwl_rates[index].plcp; 827 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE) 828 ucode_rate |= RATE_MCS_CCK_MSK; 829 return ucode_rate; 830 } 831 832 /* set RTS protection for all non legacy rates 833 * This helps with congested environments reducing the conflict cost to 834 * RTS retries only, instead of the entire BA packet. 835 */ 836 ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK; 837 838 if (is_ht(rate)) { 839 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) { 840 IWL_ERR(mvm, "Invalid HT rate index %d\n", index); 841 index = IWL_LAST_HT_RATE; 842 } 843 ucode_rate |= RATE_MCS_HT_MSK; 844 845 if (is_ht_siso(rate)) 846 ucode_rate |= iwl_rates[index].plcp_ht_siso; 847 else if (is_ht_mimo2(rate)) 848 ucode_rate |= iwl_rates[index].plcp_ht_mimo2; 849 else 850 WARN_ON_ONCE(1); 851 } else if (is_vht(rate)) { 852 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) { 853 IWL_ERR(mvm, "Invalid VHT rate index %d\n", index); 854 index = IWL_LAST_VHT_RATE; 855 } 856 ucode_rate |= RATE_MCS_VHT_MSK; 857 if (is_vht_siso(rate)) 858 ucode_rate |= iwl_rates[index].plcp_vht_siso; 859 else if (is_vht_mimo2(rate)) 860 ucode_rate |= iwl_rates[index].plcp_vht_mimo2; 861 else 862 WARN_ON_ONCE(1); 863 864 } else { 865 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type); 866 } 867 868 if (is_siso(rate) && rate->stbc) { 869 /* To enable STBC we need to set both a flag and ANT_AB */ 870 ucode_rate |= RATE_MCS_ANT_AB_MSK; 871 ucode_rate |= RATE_MCS_STBC_MSK; 872 } 873 874 ucode_rate |= rate->bw; 875 if (rate->sgi) 876 ucode_rate |= RATE_MCS_SGI_MSK; 877 if (rate->ldpc) 878 ucode_rate |= RATE_MCS_LDPC_MSK; 879 880 return ucode_rate; 881 } 882 883 /* Convert a ucode rate into an rs_rate object */ 884 static int rs_rate_from_ucode_rate(const u32 ucode_rate, 885 enum nl80211_band band, 886 struct rs_rate *rate) 887 { 888 u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK; 889 u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate); 890 u8 nss; 891 892 memset(rate, 0, sizeof(*rate)); 893 rate->index = iwl_hwrate_to_plcp_idx(ucode_rate); 894 895 if (rate->index == IWL_RATE_INVALID) 896 return -EINVAL; 897 898 rate->ant = (ant_msk >> RATE_MCS_ANT_POS); 899 900 /* Legacy */ 901 if (!(ucode_rate & RATE_MCS_HT_MSK) && 902 !(ucode_rate & RATE_MCS_VHT_MSK) && 903 !(ucode_rate & RATE_MCS_HE_MSK)) { 904 if (num_of_ant == 1) { 905 if (band == NL80211_BAND_5GHZ) 906 rate->type = LQ_LEGACY_A; 907 else 908 rate->type = LQ_LEGACY_G; 909 } 910 911 return 0; 912 } 913 914 /* HT, VHT or HE */ 915 if (ucode_rate & RATE_MCS_SGI_MSK) 916 rate->sgi = true; 917 if (ucode_rate & RATE_MCS_LDPC_MSK) 918 rate->ldpc = true; 919 if (ucode_rate & RATE_MCS_STBC_MSK) 920 rate->stbc = true; 921 if (ucode_rate & RATE_MCS_BF_MSK) 922 rate->bfer = true; 923 924 rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK; 925 926 if (ucode_rate & RATE_MCS_HT_MSK) { 927 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >> 928 RATE_HT_MCS_NSS_POS) + 1; 929 930 if (nss == 1) { 931 rate->type = LQ_HT_SISO; 932 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 933 "stbc %d bfer %d", 934 rate->stbc, rate->bfer); 935 } else if (nss == 2) { 936 rate->type = LQ_HT_MIMO2; 937 WARN_ON_ONCE(num_of_ant != 2); 938 } else { 939 WARN_ON_ONCE(1); 940 } 941 } else if (ucode_rate & RATE_MCS_VHT_MSK) { 942 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 943 RATE_VHT_MCS_NSS_POS) + 1; 944 945 if (nss == 1) { 946 rate->type = LQ_VHT_SISO; 947 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 948 "stbc %d bfer %d", 949 rate->stbc, rate->bfer); 950 } else if (nss == 2) { 951 rate->type = LQ_VHT_MIMO2; 952 WARN_ON_ONCE(num_of_ant != 2); 953 } else { 954 WARN_ON_ONCE(1); 955 } 956 } else if (ucode_rate & RATE_MCS_HE_MSK) { 957 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >> 958 RATE_VHT_MCS_NSS_POS) + 1; 959 960 if (nss == 1) { 961 rate->type = LQ_HE_SISO; 962 WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1, 963 "stbc %d bfer %d", rate->stbc, rate->bfer); 964 } else if (nss == 2) { 965 rate->type = LQ_HE_MIMO2; 966 WARN_ON_ONCE(num_of_ant != 2); 967 } else { 968 WARN_ON_ONCE(1); 969 } 970 } 971 972 WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 && 973 !is_he(rate) && !is_vht(rate)); 974 975 return 0; 976 } 977 978 /* switch to another antenna/antennas and return 1 */ 979 /* if no other valid antenna found, return 0 */ 980 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate) 981 { 982 u8 new_ant_type; 983 984 if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C)) 985 return 0; 986 987 if (!rs_is_valid_ant(valid_ant, rate->ant)) 988 return 0; 989 990 new_ant_type = ant_toggle_lookup[rate->ant]; 991 992 while ((new_ant_type != rate->ant) && 993 !rs_is_valid_ant(valid_ant, new_ant_type)) 994 new_ant_type = ant_toggle_lookup[new_ant_type]; 995 996 if (new_ant_type == rate->ant) 997 return 0; 998 999 rate->ant = new_ant_type; 1000 1001 return 1; 1002 } 1003 1004 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta, 1005 struct rs_rate *rate) 1006 { 1007 if (is_legacy(rate)) 1008 return lq_sta->active_legacy_rate; 1009 else if (is_siso(rate)) 1010 return lq_sta->active_siso_rate; 1011 else if (is_mimo2(rate)) 1012 return lq_sta->active_mimo2_rate; 1013 1014 WARN_ON_ONCE(1); 1015 return 0; 1016 } 1017 1018 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask, 1019 int rate_type) 1020 { 1021 u8 high = IWL_RATE_INVALID; 1022 u8 low = IWL_RATE_INVALID; 1023 1024 /* 802.11A or ht walks to the next literal adjacent rate in 1025 * the rate table */ 1026 if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) { 1027 int i; 1028 u32 mask; 1029 1030 /* Find the previous rate that is in the rate mask */ 1031 i = index - 1; 1032 if (i >= 0) 1033 mask = BIT(i); 1034 for (; i >= 0; i--, mask >>= 1) { 1035 if (rate_mask & mask) { 1036 low = i; 1037 break; 1038 } 1039 } 1040 1041 /* Find the next rate that is in the rate mask */ 1042 i = index + 1; 1043 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) { 1044 if (rate_mask & mask) { 1045 high = i; 1046 break; 1047 } 1048 } 1049 1050 return (high << 8) | low; 1051 } 1052 1053 low = index; 1054 while (low != IWL_RATE_INVALID) { 1055 low = iwl_rates[low].prev_rs; 1056 if (low == IWL_RATE_INVALID) 1057 break; 1058 if (rate_mask & (1 << low)) 1059 break; 1060 } 1061 1062 high = index; 1063 while (high != IWL_RATE_INVALID) { 1064 high = iwl_rates[high].next_rs; 1065 if (high == IWL_RATE_INVALID) 1066 break; 1067 if (rate_mask & (1 << high)) 1068 break; 1069 } 1070 1071 return (high << 8) | low; 1072 } 1073 1074 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta, 1075 struct rs_rate *rate) 1076 { 1077 return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate); 1078 } 1079 1080 /* Get the next supported lower rate in the current column. 1081 * Return true if bottom rate in the current column was reached 1082 */ 1083 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta, 1084 struct rs_rate *rate) 1085 { 1086 u8 low; 1087 u16 high_low; 1088 u16 rate_mask; 1089 struct iwl_mvm *mvm = lq_sta->pers.drv; 1090 1091 rate_mask = rs_get_supported_rates(lq_sta, rate); 1092 high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask, 1093 rate->type); 1094 low = high_low & 0xff; 1095 1096 /* Bottom rate of column reached */ 1097 if (low == IWL_RATE_INVALID) 1098 return true; 1099 1100 rate->index = low; 1101 return false; 1102 } 1103 1104 /* Get the next rate to use following a column downgrade */ 1105 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta, 1106 struct rs_rate *rate) 1107 { 1108 struct iwl_mvm *mvm = lq_sta->pers.drv; 1109 1110 if (is_legacy(rate)) { 1111 /* No column to downgrade from Legacy */ 1112 return; 1113 } else if (is_siso(rate)) { 1114 /* Downgrade to Legacy if we were in SISO */ 1115 if (lq_sta->band == NL80211_BAND_5GHZ) 1116 rate->type = LQ_LEGACY_A; 1117 else 1118 rate->type = LQ_LEGACY_G; 1119 1120 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1121 1122 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX || 1123 rate->index > IWL_RATE_MCS_9_INDEX); 1124 1125 rate->index = rs_ht_to_legacy[rate->index]; 1126 rate->ldpc = false; 1127 } else { 1128 /* Downgrade to SISO with same MCS if in MIMO */ 1129 rate->type = is_vht_mimo2(rate) ? 1130 LQ_VHT_SISO : LQ_HT_SISO; 1131 } 1132 1133 if (num_of_ant(rate->ant) > 1) 1134 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm)); 1135 1136 /* Relevant in both switching to SISO or Legacy */ 1137 rate->sgi = false; 1138 1139 if (!rs_rate_supported(lq_sta, rate)) 1140 rs_get_lower_rate_in_column(lq_sta, rate); 1141 } 1142 1143 /* Check if both rates share the same column */ 1144 static inline bool rs_rate_column_match(struct rs_rate *a, 1145 struct rs_rate *b) 1146 { 1147 bool ant_match; 1148 1149 if (a->stbc || a->bfer) 1150 ant_match = (b->ant == ANT_A || b->ant == ANT_B); 1151 else 1152 ant_match = (a->ant == b->ant); 1153 1154 return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi) 1155 && ant_match; 1156 } 1157 1158 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate) 1159 { 1160 if (is_legacy(rate)) { 1161 if (rate->ant == ANT_A) 1162 return RS_COLUMN_LEGACY_ANT_A; 1163 1164 if (rate->ant == ANT_B) 1165 return RS_COLUMN_LEGACY_ANT_B; 1166 1167 goto err; 1168 } 1169 1170 if (is_siso(rate)) { 1171 if (rate->ant == ANT_A || rate->stbc || rate->bfer) 1172 return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI : 1173 RS_COLUMN_SISO_ANT_A; 1174 1175 if (rate->ant == ANT_B) 1176 return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI : 1177 RS_COLUMN_SISO_ANT_B; 1178 1179 goto err; 1180 } 1181 1182 if (is_mimo(rate)) 1183 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2; 1184 1185 err: 1186 return RS_COLUMN_INVALID; 1187 } 1188 1189 static u8 rs_get_tid(struct ieee80211_hdr *hdr) 1190 { 1191 u8 tid = IWL_MAX_TID_COUNT; 1192 1193 if (ieee80211_is_data_qos(hdr->frame_control)) { 1194 u8 *qc = ieee80211_get_qos_ctl(hdr); 1195 tid = qc[0] & 0xf; 1196 } 1197 1198 if (unlikely(tid > IWL_MAX_TID_COUNT)) 1199 tid = IWL_MAX_TID_COUNT; 1200 1201 return tid; 1202 } 1203 1204 /* 1205 * mac80211 sends us Tx status 1206 */ 1207 static void rs_drv_mac80211_tx_status(void *mvm_r, 1208 struct ieee80211_supported_band *sband, 1209 struct ieee80211_sta *sta, void *priv_sta, 1210 struct sk_buff *skb) 1211 { 1212 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1213 struct iwl_op_mode *op_mode = mvm_r; 1214 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 1215 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1216 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1217 1218 if (!mvmsta->vif) 1219 return; 1220 1221 if (!ieee80211_is_data(hdr->frame_control) || 1222 info->flags & IEEE80211_TX_CTL_NO_ACK) 1223 return; 1224 1225 iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info, 1226 ieee80211_is_qos_nullfunc(hdr->frame_control)); 1227 } 1228 1229 /* 1230 * Begin a period of staying with a selected modulation mode. 1231 * Set "stay_in_tbl" flag to prevent any mode switches. 1232 * Set frame tx success limits according to legacy vs. high-throughput, 1233 * and reset overall (spanning all rates) tx success history statistics. 1234 * These control how long we stay using same modulation mode before 1235 * searching for a new mode. 1236 */ 1237 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy, 1238 struct iwl_lq_sta *lq_sta) 1239 { 1240 IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n"); 1241 lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN; 1242 if (is_legacy) { 1243 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT; 1244 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT; 1245 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT; 1246 } else { 1247 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT; 1248 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT; 1249 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT; 1250 } 1251 lq_sta->table_count = 0; 1252 lq_sta->total_failed = 0; 1253 lq_sta->total_success = 0; 1254 lq_sta->flush_timer = jiffies; 1255 lq_sta->visited_columns = 0; 1256 } 1257 1258 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask) 1259 { 1260 if (rate_mask) 1261 return find_last_bit(&rate_mask, BITS_PER_LONG); 1262 return IWL_RATE_INVALID; 1263 } 1264 1265 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta, 1266 const struct rs_tx_column *column) 1267 { 1268 switch (column->mode) { 1269 case RS_LEGACY: 1270 return lq_sta->max_legacy_rate_idx; 1271 case RS_SISO: 1272 return lq_sta->max_siso_rate_idx; 1273 case RS_MIMO2: 1274 return lq_sta->max_mimo2_rate_idx; 1275 default: 1276 WARN_ON_ONCE(1); 1277 } 1278 1279 return lq_sta->max_legacy_rate_idx; 1280 } 1281 1282 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1283 const struct rs_tx_column *column, 1284 u32 bw) 1285 { 1286 /* Used to choose among HT tables */ 1287 const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT]; 1288 1289 if (WARN_ON_ONCE(column->mode != RS_LEGACY && 1290 column->mode != RS_SISO && 1291 column->mode != RS_MIMO2)) 1292 return expected_tpt_legacy; 1293 1294 /* Legacy rates have only one table */ 1295 if (column->mode == RS_LEGACY) 1296 return expected_tpt_legacy; 1297 1298 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1299 /* Choose among many HT tables depending on number of streams 1300 * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation 1301 * status */ 1302 if (column->mode == RS_SISO) { 1303 switch (bw) { 1304 case RATE_MCS_CHAN_WIDTH_20: 1305 ht_tbl_pointer = expected_tpt_siso_20MHz; 1306 break; 1307 case RATE_MCS_CHAN_WIDTH_40: 1308 ht_tbl_pointer = expected_tpt_siso_40MHz; 1309 break; 1310 case RATE_MCS_CHAN_WIDTH_80: 1311 ht_tbl_pointer = expected_tpt_siso_80MHz; 1312 break; 1313 case RATE_MCS_CHAN_WIDTH_160: 1314 ht_tbl_pointer = expected_tpt_siso_160MHz; 1315 break; 1316 default: 1317 WARN_ON_ONCE(1); 1318 } 1319 } else if (column->mode == RS_MIMO2) { 1320 switch (bw) { 1321 case RATE_MCS_CHAN_WIDTH_20: 1322 ht_tbl_pointer = expected_tpt_mimo2_20MHz; 1323 break; 1324 case RATE_MCS_CHAN_WIDTH_40: 1325 ht_tbl_pointer = expected_tpt_mimo2_40MHz; 1326 break; 1327 case RATE_MCS_CHAN_WIDTH_80: 1328 ht_tbl_pointer = expected_tpt_mimo2_80MHz; 1329 break; 1330 case RATE_MCS_CHAN_WIDTH_160: 1331 ht_tbl_pointer = expected_tpt_mimo2_160MHz; 1332 break; 1333 default: 1334 WARN_ON_ONCE(1); 1335 } 1336 } else { 1337 WARN_ON_ONCE(1); 1338 } 1339 1340 if (!column->sgi && !lq_sta->is_agg) /* Normal */ 1341 return ht_tbl_pointer[0]; 1342 else if (column->sgi && !lq_sta->is_agg) /* SGI */ 1343 return ht_tbl_pointer[1]; 1344 else if (!column->sgi && lq_sta->is_agg) /* AGG */ 1345 return ht_tbl_pointer[2]; 1346 else /* AGG+SGI */ 1347 return ht_tbl_pointer[3]; 1348 } 1349 1350 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta, 1351 struct iwl_scale_tbl_info *tbl) 1352 { 1353 struct rs_rate *rate = &tbl->rate; 1354 const struct rs_tx_column *column = &rs_tx_columns[tbl->column]; 1355 1356 tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw); 1357 } 1358 1359 /* rs uses two tables, one is active and the second is for searching better 1360 * configuration. This function, according to the index of the currently 1361 * active table returns the search table, which is located at the 1362 * index complementary to 1 according to the active table (active = 1, 1363 * search = 0 or active = 0, search = 1). 1364 * Since lq_info is an arary of size 2, make sure index cannot be out of bounds. 1365 */ 1366 static inline u8 rs_search_tbl(u8 active_tbl) 1367 { 1368 return (active_tbl ^ 1) & 1; 1369 } 1370 1371 static s32 rs_get_best_rate(struct iwl_mvm *mvm, 1372 struct iwl_lq_sta *lq_sta, 1373 struct iwl_scale_tbl_info *tbl, /* "search" */ 1374 unsigned long rate_mask, s8 index) 1375 { 1376 struct iwl_scale_tbl_info *active_tbl = 1377 &(lq_sta->lq_info[lq_sta->active_tbl]); 1378 s32 success_ratio = active_tbl->win[index].success_ratio; 1379 u16 expected_current_tpt = active_tbl->expected_tpt[index]; 1380 const u16 *tpt_tbl = tbl->expected_tpt; 1381 u16 high_low; 1382 u32 target_tpt; 1383 int rate_idx; 1384 1385 if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1386 target_tpt = 100 * expected_current_tpt; 1387 IWL_DEBUG_RATE(mvm, 1388 "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n", 1389 success_ratio, target_tpt); 1390 } else { 1391 target_tpt = lq_sta->last_tpt; 1392 IWL_DEBUG_RATE(mvm, 1393 "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n", 1394 success_ratio, target_tpt); 1395 } 1396 1397 rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG); 1398 1399 while (rate_idx != IWL_RATE_INVALID) { 1400 if (target_tpt < (100 * tpt_tbl[rate_idx])) 1401 break; 1402 1403 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask, 1404 tbl->rate.type); 1405 1406 rate_idx = (high_low >> 8) & 0xff; 1407 } 1408 1409 IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n", 1410 rate_idx, target_tpt, 1411 rate_idx != IWL_RATE_INVALID ? 1412 100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE); 1413 1414 return rate_idx; 1415 } 1416 1417 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta) 1418 { 1419 struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap; 1420 struct ieee80211_vht_cap vht_cap = { 1421 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap), 1422 .supp_mcs = sta_vht_cap->vht_mcs, 1423 }; 1424 1425 switch (sta->bandwidth) { 1426 case IEEE80211_STA_RX_BW_160: 1427 /* 1428 * Don't use 160 MHz if VHT extended NSS support 1429 * says we cannot use 2 streams, we don't want to 1430 * deal with this. 1431 * We only check MCS 0 - they will support that if 1432 * we got here at all and we don't care which MCS, 1433 * we want to determine a more global state. 1434 */ 1435 if (ieee80211_get_vht_max_nss(&vht_cap, 1436 IEEE80211_VHT_CHANWIDTH_160MHZ, 1437 0, true, 1438 sta->rx_nss) < sta->rx_nss) 1439 return RATE_MCS_CHAN_WIDTH_80; 1440 return RATE_MCS_CHAN_WIDTH_160; 1441 case IEEE80211_STA_RX_BW_80: 1442 return RATE_MCS_CHAN_WIDTH_80; 1443 case IEEE80211_STA_RX_BW_40: 1444 return RATE_MCS_CHAN_WIDTH_40; 1445 case IEEE80211_STA_RX_BW_20: 1446 default: 1447 return RATE_MCS_CHAN_WIDTH_20; 1448 } 1449 } 1450 1451 /* 1452 * Check whether we should continue using same modulation mode, or 1453 * begin search for a new mode, based on: 1454 * 1) # tx successes or failures while using this mode 1455 * 2) # times calling this function 1456 * 3) elapsed time in this mode (not used, for now) 1457 */ 1458 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search) 1459 { 1460 struct iwl_scale_tbl_info *tbl; 1461 int active_tbl; 1462 int flush_interval_passed = 0; 1463 struct iwl_mvm *mvm; 1464 1465 mvm = lq_sta->pers.drv; 1466 active_tbl = lq_sta->active_tbl; 1467 1468 tbl = &(lq_sta->lq_info[active_tbl]); 1469 1470 /* If we've been disallowing search, see if we should now allow it */ 1471 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 1472 /* Elapsed time using current modulation mode */ 1473 if (lq_sta->flush_timer) 1474 flush_interval_passed = 1475 time_after(jiffies, 1476 (unsigned long)(lq_sta->flush_timer + 1477 (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ))); 1478 1479 /* 1480 * Check if we should allow search for new modulation mode. 1481 * If many frames have failed or succeeded, or we've used 1482 * this same modulation for a long time, allow search, and 1483 * reset history stats that keep track of whether we should 1484 * allow a new search. Also (below) reset all bitmaps and 1485 * stats in active history. 1486 */ 1487 if (force_search || 1488 (lq_sta->total_failed > lq_sta->max_failure_limit) || 1489 (lq_sta->total_success > lq_sta->max_success_limit) || 1490 ((!lq_sta->search_better_tbl) && 1491 (lq_sta->flush_timer) && (flush_interval_passed))) { 1492 IWL_DEBUG_RATE(mvm, 1493 "LQ: stay is expired %d %d %d\n", 1494 lq_sta->total_failed, 1495 lq_sta->total_success, 1496 flush_interval_passed); 1497 1498 /* Allow search for new mode */ 1499 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED; 1500 IWL_DEBUG_RATE(mvm, 1501 "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n"); 1502 lq_sta->total_failed = 0; 1503 lq_sta->total_success = 0; 1504 lq_sta->flush_timer = 0; 1505 /* mark the current column as visited */ 1506 lq_sta->visited_columns = BIT(tbl->column); 1507 /* 1508 * Else if we've used this modulation mode enough repetitions 1509 * (regardless of elapsed time or success/failure), reset 1510 * history bitmaps and rate-specific stats for all rates in 1511 * active table. 1512 */ 1513 } else { 1514 lq_sta->table_count++; 1515 if (lq_sta->table_count >= 1516 lq_sta->table_count_limit) { 1517 lq_sta->table_count = 0; 1518 1519 IWL_DEBUG_RATE(mvm, 1520 "LQ: stay in table clear win\n"); 1521 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1522 } 1523 } 1524 1525 /* If transitioning to allow "search", reset all history 1526 * bitmaps and stats in active table (this will become the new 1527 * "search" table). */ 1528 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) { 1529 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1530 } 1531 } 1532 } 1533 1534 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1535 struct iwl_scale_tbl_info *tbl, 1536 enum rs_action scale_action) 1537 { 1538 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 1539 int i; 1540 1541 sta->max_amsdu_len = rs_fw_get_max_amsdu_len(sta); 1542 1543 /* 1544 * In case TLC offload is not active amsdu_enabled is either 0xFFFF 1545 * or 0, since there is no per-TID alg. 1546 */ 1547 if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) || 1548 tbl->rate.index < IWL_RATE_MCS_5_INDEX || 1549 scale_action == RS_ACTION_DOWNSCALE) 1550 mvmsta->amsdu_enabled = 0; 1551 else 1552 mvmsta->amsdu_enabled = 0xFFFF; 1553 1554 if (mvmsta->vif->bss_conf.he_support && 1555 !iwlwifi_mod_params.disable_11ax) 1556 mvmsta->max_amsdu_len = sta->max_amsdu_len; 1557 else 1558 mvmsta->max_amsdu_len = min_t(int, sta->max_amsdu_len, 8500); 1559 1560 sta->max_rc_amsdu_len = mvmsta->max_amsdu_len; 1561 1562 for (i = 0; i < IWL_MAX_TID_COUNT; i++) { 1563 if (mvmsta->amsdu_enabled) 1564 sta->max_tid_amsdu_len[i] = 1565 iwl_mvm_max_amsdu_size(mvm, sta, i); 1566 else 1567 /* 1568 * Not so elegant, but this will effectively 1569 * prevent AMSDU on this TID 1570 */ 1571 sta->max_tid_amsdu_len[i] = 1; 1572 } 1573 } 1574 1575 /* 1576 * setup rate table in uCode 1577 */ 1578 static void rs_update_rate_tbl(struct iwl_mvm *mvm, 1579 struct ieee80211_sta *sta, 1580 struct iwl_lq_sta *lq_sta, 1581 struct iwl_scale_tbl_info *tbl) 1582 { 1583 rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate); 1584 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 1585 } 1586 1587 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm, 1588 struct ieee80211_sta *sta, 1589 struct iwl_lq_sta *lq_sta, 1590 struct iwl_scale_tbl_info *tbl, 1591 enum rs_action scale_action) 1592 { 1593 if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80) 1594 return false; 1595 1596 if (!is_vht_siso(&tbl->rate)) 1597 return false; 1598 1599 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) && 1600 (tbl->rate.index == IWL_RATE_MCS_0_INDEX) && 1601 (scale_action == RS_ACTION_DOWNSCALE)) { 1602 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20; 1603 tbl->rate.index = IWL_RATE_MCS_4_INDEX; 1604 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n"); 1605 goto tweaked; 1606 } 1607 1608 /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is 1609 * sustainable, i.e. we're past the test window. We can't go back 1610 * if MCS5 is just tested as this will happen always after switching 1611 * to 20Mhz MCS4 because the rate stats are cleared. 1612 */ 1613 if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) && 1614 (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) && 1615 (scale_action == RS_ACTION_STAY)) || 1616 ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) && 1617 (scale_action == RS_ACTION_UPSCALE)))) { 1618 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80; 1619 tbl->rate.index = IWL_RATE_MCS_1_INDEX; 1620 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n"); 1621 goto tweaked; 1622 } 1623 1624 return false; 1625 1626 tweaked: 1627 rs_set_expected_tpt_table(lq_sta, tbl); 1628 rs_rate_scale_clear_tbl_windows(mvm, tbl); 1629 return true; 1630 } 1631 1632 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm, 1633 struct iwl_lq_sta *lq_sta, 1634 struct ieee80211_sta *sta, 1635 struct iwl_scale_tbl_info *tbl) 1636 { 1637 int i, j, max_rate; 1638 enum rs_column next_col_id; 1639 const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column]; 1640 const struct rs_tx_column *next_col; 1641 allow_column_func_t allow_func; 1642 u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm); 1643 const u16 *expected_tpt_tbl; 1644 u16 tpt, max_expected_tpt; 1645 1646 for (i = 0; i < MAX_NEXT_COLUMNS; i++) { 1647 next_col_id = curr_col->next_columns[i]; 1648 1649 if (next_col_id == RS_COLUMN_INVALID) 1650 continue; 1651 1652 if (lq_sta->visited_columns & BIT(next_col_id)) { 1653 IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n", 1654 next_col_id); 1655 continue; 1656 } 1657 1658 next_col = &rs_tx_columns[next_col_id]; 1659 1660 if (!rs_is_valid_ant(valid_ants, next_col->ant)) { 1661 IWL_DEBUG_RATE(mvm, 1662 "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n", 1663 next_col_id, valid_ants, next_col->ant); 1664 continue; 1665 } 1666 1667 for (j = 0; j < MAX_COLUMN_CHECKS; j++) { 1668 allow_func = next_col->checks[j]; 1669 if (allow_func && !allow_func(mvm, sta, &tbl->rate, 1670 next_col)) 1671 break; 1672 } 1673 1674 if (j != MAX_COLUMN_CHECKS) { 1675 IWL_DEBUG_RATE(mvm, 1676 "Skip column %d: not allowed (check %d failed)\n", 1677 next_col_id, j); 1678 1679 continue; 1680 } 1681 1682 tpt = lq_sta->last_tpt / 100; 1683 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col, 1684 rs_bw_from_sta_bw(sta)); 1685 if (WARN_ON_ONCE(!expected_tpt_tbl)) 1686 continue; 1687 1688 max_rate = rs_get_max_allowed_rate(lq_sta, next_col); 1689 if (max_rate == IWL_RATE_INVALID) { 1690 IWL_DEBUG_RATE(mvm, 1691 "Skip column %d: no rate is allowed in this column\n", 1692 next_col_id); 1693 continue; 1694 } 1695 1696 max_expected_tpt = expected_tpt_tbl[max_rate]; 1697 if (tpt >= max_expected_tpt) { 1698 IWL_DEBUG_RATE(mvm, 1699 "Skip column %d: can't beat current TPT. Max expected %d current %d\n", 1700 next_col_id, max_expected_tpt, tpt); 1701 continue; 1702 } 1703 1704 IWL_DEBUG_RATE(mvm, 1705 "Found potential column %d. Max expected %d current %d\n", 1706 next_col_id, max_expected_tpt, tpt); 1707 break; 1708 } 1709 1710 if (i == MAX_NEXT_COLUMNS) 1711 return RS_COLUMN_INVALID; 1712 1713 return next_col_id; 1714 } 1715 1716 static int rs_switch_to_column(struct iwl_mvm *mvm, 1717 struct iwl_lq_sta *lq_sta, 1718 struct ieee80211_sta *sta, 1719 enum rs_column col_id) 1720 { 1721 struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 1722 struct iwl_scale_tbl_info *search_tbl = 1723 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 1724 struct rs_rate *rate = &search_tbl->rate; 1725 const struct rs_tx_column *column = &rs_tx_columns[col_id]; 1726 const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column]; 1727 unsigned long rate_mask = 0; 1728 u32 rate_idx = 0; 1729 1730 memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win)); 1731 1732 rate->sgi = column->sgi; 1733 rate->ant = column->ant; 1734 1735 if (column->mode == RS_LEGACY) { 1736 if (lq_sta->band == NL80211_BAND_5GHZ) 1737 rate->type = LQ_LEGACY_A; 1738 else 1739 rate->type = LQ_LEGACY_G; 1740 1741 rate->bw = RATE_MCS_CHAN_WIDTH_20; 1742 rate->ldpc = false; 1743 rate_mask = lq_sta->active_legacy_rate; 1744 } else if (column->mode == RS_SISO) { 1745 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 1746 rate_mask = lq_sta->active_siso_rate; 1747 } else if (column->mode == RS_MIMO2) { 1748 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 1749 rate_mask = lq_sta->active_mimo2_rate; 1750 } else { 1751 WARN_ONCE(1, "Bad column mode"); 1752 } 1753 1754 if (column->mode != RS_LEGACY) { 1755 rate->bw = rs_bw_from_sta_bw(sta); 1756 rate->ldpc = lq_sta->ldpc; 1757 } 1758 1759 search_tbl->column = col_id; 1760 rs_set_expected_tpt_table(lq_sta, search_tbl); 1761 1762 lq_sta->visited_columns |= BIT(col_id); 1763 1764 /* Get the best matching rate if we're changing modes. e.g. 1765 * SISO->MIMO, LEGACY->SISO, MIMO->SISO 1766 */ 1767 if (curr_column->mode != column->mode) { 1768 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl, 1769 rate_mask, rate->index); 1770 1771 if ((rate_idx == IWL_RATE_INVALID) || 1772 !(BIT(rate_idx) & rate_mask)) { 1773 IWL_DEBUG_RATE(mvm, 1774 "can not switch with index %d" 1775 " rate mask %lx\n", 1776 rate_idx, rate_mask); 1777 1778 goto err; 1779 } 1780 1781 rate->index = rate_idx; 1782 } 1783 1784 IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n", 1785 col_id, rate->index); 1786 1787 return 0; 1788 1789 err: 1790 rate->type = LQ_NONE; 1791 return -1; 1792 } 1793 1794 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm, 1795 struct iwl_scale_tbl_info *tbl, 1796 s32 sr, int low, int high, 1797 int current_tpt, 1798 int low_tpt, int high_tpt) 1799 { 1800 enum rs_action action = RS_ACTION_STAY; 1801 1802 if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) || 1803 (current_tpt == 0)) { 1804 IWL_DEBUG_RATE(mvm, 1805 "Decrease rate because of low SR\n"); 1806 return RS_ACTION_DOWNSCALE; 1807 } 1808 1809 if ((low_tpt == IWL_INVALID_VALUE) && 1810 (high_tpt == IWL_INVALID_VALUE) && 1811 (high != IWL_RATE_INVALID)) { 1812 IWL_DEBUG_RATE(mvm, 1813 "No data about high/low rates. Increase rate\n"); 1814 return RS_ACTION_UPSCALE; 1815 } 1816 1817 if ((high_tpt == IWL_INVALID_VALUE) && 1818 (high != IWL_RATE_INVALID) && 1819 (low_tpt != IWL_INVALID_VALUE) && 1820 (low_tpt < current_tpt)) { 1821 IWL_DEBUG_RATE(mvm, 1822 "No data about high rate and low rate is worse. Increase rate\n"); 1823 return RS_ACTION_UPSCALE; 1824 } 1825 1826 if ((high_tpt != IWL_INVALID_VALUE) && 1827 (high_tpt > current_tpt)) { 1828 IWL_DEBUG_RATE(mvm, 1829 "Higher rate is better. Increate rate\n"); 1830 return RS_ACTION_UPSCALE; 1831 } 1832 1833 if ((low_tpt != IWL_INVALID_VALUE) && 1834 (high_tpt != IWL_INVALID_VALUE) && 1835 (low_tpt < current_tpt) && 1836 (high_tpt < current_tpt)) { 1837 IWL_DEBUG_RATE(mvm, 1838 "Both high and low are worse. Maintain rate\n"); 1839 return RS_ACTION_STAY; 1840 } 1841 1842 if ((low_tpt != IWL_INVALID_VALUE) && 1843 (low_tpt > current_tpt)) { 1844 IWL_DEBUG_RATE(mvm, 1845 "Lower rate is better\n"); 1846 action = RS_ACTION_DOWNSCALE; 1847 goto out; 1848 } 1849 1850 if ((low_tpt == IWL_INVALID_VALUE) && 1851 (low != IWL_RATE_INVALID)) { 1852 IWL_DEBUG_RATE(mvm, 1853 "No data about lower rate\n"); 1854 action = RS_ACTION_DOWNSCALE; 1855 goto out; 1856 } 1857 1858 IWL_DEBUG_RATE(mvm, "Maintain rate\n"); 1859 1860 out: 1861 if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) { 1862 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) { 1863 IWL_DEBUG_RATE(mvm, 1864 "SR is above NO DECREASE. Avoid downscale\n"); 1865 action = RS_ACTION_STAY; 1866 } else if (current_tpt > (100 * tbl->expected_tpt[low])) { 1867 IWL_DEBUG_RATE(mvm, 1868 "Current TPT is higher than max expected in low rate. Avoid downscale\n"); 1869 action = RS_ACTION_STAY; 1870 } else { 1871 IWL_DEBUG_RATE(mvm, "Decrease rate\n"); 1872 } 1873 } 1874 1875 return action; 1876 } 1877 1878 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 1879 struct iwl_lq_sta *lq_sta) 1880 { 1881 /* Our chip supports Tx STBC and the peer is an HT/VHT STA which 1882 * supports STBC of at least 1*SS 1883 */ 1884 if (!lq_sta->stbc_capable) 1885 return false; 1886 1887 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 1888 return false; 1889 1890 return true; 1891 } 1892 1893 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index, 1894 int *weaker, int *stronger) 1895 { 1896 *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP; 1897 if (*weaker > TPC_MAX_REDUCTION) 1898 *weaker = TPC_INVALID; 1899 1900 *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP; 1901 if (*stronger < 0) 1902 *stronger = TPC_INVALID; 1903 } 1904 1905 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 1906 struct rs_rate *rate, enum nl80211_band band) 1907 { 1908 int index = rate->index; 1909 bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM); 1910 bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION && 1911 !vif->bss_conf.ps); 1912 1913 IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n", 1914 cam, sta_ps_disabled); 1915 /* 1916 * allow tpc only if power management is enabled, or bt coex 1917 * activity grade allows it and we are on 2.4Ghz. 1918 */ 1919 if ((cam || sta_ps_disabled) && 1920 !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band)) 1921 return false; 1922 1923 IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type); 1924 if (is_legacy(rate)) 1925 return index == IWL_RATE_54M_INDEX; 1926 if (is_ht(rate)) 1927 return index == IWL_RATE_MCS_7_INDEX; 1928 if (is_vht(rate)) 1929 return index == IWL_RATE_MCS_7_INDEX || 1930 index == IWL_RATE_MCS_8_INDEX || 1931 index == IWL_RATE_MCS_9_INDEX; 1932 1933 WARN_ON_ONCE(1); 1934 return false; 1935 } 1936 1937 enum tpc_action { 1938 TPC_ACTION_STAY, 1939 TPC_ACTION_DECREASE, 1940 TPC_ACTION_INCREASE, 1941 TPC_ACTION_NO_RESTIRCTION, 1942 }; 1943 1944 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm, 1945 s32 sr, int weak, int strong, 1946 int current_tpt, 1947 int weak_tpt, int strong_tpt) 1948 { 1949 /* stay until we have valid tpt */ 1950 if (current_tpt == IWL_INVALID_VALUE) { 1951 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n"); 1952 return TPC_ACTION_STAY; 1953 } 1954 1955 /* Too many failures, increase txp */ 1956 if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) || 1957 current_tpt == 0) { 1958 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n"); 1959 return TPC_ACTION_NO_RESTIRCTION; 1960 } 1961 1962 /* try decreasing first if applicable */ 1963 if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1964 weak != TPC_INVALID) { 1965 if (weak_tpt == IWL_INVALID_VALUE && 1966 (strong_tpt == IWL_INVALID_VALUE || 1967 current_tpt >= strong_tpt)) { 1968 IWL_DEBUG_RATE(mvm, 1969 "no weak txp measurement. decrease txp\n"); 1970 return TPC_ACTION_DECREASE; 1971 } 1972 1973 if (weak_tpt > current_tpt) { 1974 IWL_DEBUG_RATE(mvm, 1975 "lower txp has better tpt. decrease txp\n"); 1976 return TPC_ACTION_DECREASE; 1977 } 1978 } 1979 1980 /* next, increase if needed */ 1981 if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) && 1982 strong != TPC_INVALID) { 1983 if (weak_tpt == IWL_INVALID_VALUE && 1984 strong_tpt != IWL_INVALID_VALUE && 1985 current_tpt < strong_tpt) { 1986 IWL_DEBUG_RATE(mvm, 1987 "higher txp has better tpt. increase txp\n"); 1988 return TPC_ACTION_INCREASE; 1989 } 1990 1991 if (weak_tpt < current_tpt && 1992 (strong_tpt == IWL_INVALID_VALUE || 1993 strong_tpt > current_tpt)) { 1994 IWL_DEBUG_RATE(mvm, 1995 "lower txp has worse tpt. increase txp\n"); 1996 return TPC_ACTION_INCREASE; 1997 } 1998 } 1999 2000 IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n"); 2001 return TPC_ACTION_STAY; 2002 } 2003 2004 static bool rs_tpc_perform(struct iwl_mvm *mvm, 2005 struct ieee80211_sta *sta, 2006 struct iwl_lq_sta *lq_sta, 2007 struct iwl_scale_tbl_info *tbl) 2008 { 2009 struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta); 2010 struct ieee80211_vif *vif = mvm_sta->vif; 2011 struct ieee80211_chanctx_conf *chanctx_conf; 2012 enum nl80211_band band; 2013 struct iwl_rate_scale_data *window; 2014 struct rs_rate *rate = &tbl->rate; 2015 enum tpc_action action; 2016 s32 sr; 2017 u8 cur = lq_sta->lq.reduced_tpc; 2018 int current_tpt; 2019 int weak, strong; 2020 int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE; 2021 2022 #ifdef CONFIG_MAC80211_DEBUGFS 2023 if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) { 2024 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n", 2025 lq_sta->pers.dbg_fixed_txp_reduction); 2026 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction; 2027 return cur != lq_sta->pers.dbg_fixed_txp_reduction; 2028 } 2029 #endif 2030 2031 rcu_read_lock(); 2032 chanctx_conf = rcu_dereference(vif->chanctx_conf); 2033 if (WARN_ON(!chanctx_conf)) 2034 band = NUM_NL80211_BANDS; 2035 else 2036 band = chanctx_conf->def.chan->band; 2037 rcu_read_unlock(); 2038 2039 if (!rs_tpc_allowed(mvm, vif, rate, band)) { 2040 IWL_DEBUG_RATE(mvm, 2041 "tpc is not allowed. remove txp restrictions\n"); 2042 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2043 return cur != TPC_NO_REDUCTION; 2044 } 2045 2046 rs_get_adjacent_txp(mvm, cur, &weak, &strong); 2047 2048 /* Collect measured throughputs for current and adjacent rates */ 2049 window = tbl->tpc_win; 2050 sr = window[cur].success_ratio; 2051 current_tpt = window[cur].average_tpt; 2052 if (weak != TPC_INVALID) 2053 weak_tpt = window[weak].average_tpt; 2054 if (strong != TPC_INVALID) 2055 strong_tpt = window[strong].average_tpt; 2056 2057 IWL_DEBUG_RATE(mvm, 2058 "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n", 2059 cur, current_tpt, sr, weak, strong, 2060 weak_tpt, strong_tpt); 2061 2062 action = rs_get_tpc_action(mvm, sr, weak, strong, 2063 current_tpt, weak_tpt, strong_tpt); 2064 2065 /* override actions if we are on the edge */ 2066 if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) { 2067 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n"); 2068 action = TPC_ACTION_STAY; 2069 } else if (strong == TPC_INVALID && 2070 (action == TPC_ACTION_INCREASE || 2071 action == TPC_ACTION_NO_RESTIRCTION)) { 2072 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n"); 2073 action = TPC_ACTION_STAY; 2074 } 2075 2076 switch (action) { 2077 case TPC_ACTION_DECREASE: 2078 lq_sta->lq.reduced_tpc = weak; 2079 return true; 2080 case TPC_ACTION_INCREASE: 2081 lq_sta->lq.reduced_tpc = strong; 2082 return true; 2083 case TPC_ACTION_NO_RESTIRCTION: 2084 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION; 2085 return true; 2086 case TPC_ACTION_STAY: 2087 /* do nothing */ 2088 break; 2089 } 2090 return false; 2091 } 2092 2093 /* 2094 * Do rate scaling and search for new modulation mode. 2095 */ 2096 static void rs_rate_scale_perform(struct iwl_mvm *mvm, 2097 struct ieee80211_sta *sta, 2098 struct iwl_lq_sta *lq_sta, 2099 int tid, bool ndp) 2100 { 2101 int low = IWL_RATE_INVALID; 2102 int high = IWL_RATE_INVALID; 2103 int index; 2104 struct iwl_rate_scale_data *window = NULL; 2105 int current_tpt = IWL_INVALID_VALUE; 2106 int low_tpt = IWL_INVALID_VALUE; 2107 int high_tpt = IWL_INVALID_VALUE; 2108 u32 fail_count; 2109 enum rs_action scale_action = RS_ACTION_STAY; 2110 u16 rate_mask; 2111 u8 update_lq = 0; 2112 struct iwl_scale_tbl_info *tbl, *tbl1; 2113 u8 active_tbl = 0; 2114 u8 done_search = 0; 2115 u16 high_low; 2116 s32 sr; 2117 u8 prev_agg = lq_sta->is_agg; 2118 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2119 struct rs_rate *rate; 2120 2121 lq_sta->is_agg = !!mvmsta->agg_tids; 2122 2123 /* 2124 * Select rate-scale / modulation-mode table to work with in 2125 * the rest of this function: "search" if searching for better 2126 * modulation mode, or "active" if doing rate scaling within a mode. 2127 */ 2128 if (!lq_sta->search_better_tbl) 2129 active_tbl = lq_sta->active_tbl; 2130 else 2131 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2132 2133 tbl = &(lq_sta->lq_info[active_tbl]); 2134 rate = &tbl->rate; 2135 2136 if (prev_agg != lq_sta->is_agg) { 2137 IWL_DEBUG_RATE(mvm, 2138 "Aggregation changed: prev %d current %d. Update expected TPT table\n", 2139 prev_agg, lq_sta->is_agg); 2140 rs_set_expected_tpt_table(lq_sta, tbl); 2141 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2142 } 2143 2144 /* current tx rate */ 2145 index = rate->index; 2146 2147 /* rates available for this association, and for modulation mode */ 2148 rate_mask = rs_get_supported_rates(lq_sta, rate); 2149 2150 if (!(BIT(index) & rate_mask)) { 2151 IWL_ERR(mvm, "Current Rate is not valid\n"); 2152 if (lq_sta->search_better_tbl) { 2153 /* revert to active table if search table is not valid*/ 2154 rate->type = LQ_NONE; 2155 lq_sta->search_better_tbl = 0; 2156 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 2157 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2158 } 2159 return; 2160 } 2161 2162 /* Get expected throughput table and history window for current rate */ 2163 if (!tbl->expected_tpt) { 2164 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n"); 2165 return; 2166 } 2167 2168 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2169 window = &(tbl->win[index]); 2170 2171 /* 2172 * If there is not enough history to calculate actual average 2173 * throughput, keep analyzing results of more tx frames, without 2174 * changing rate or mode (bypass most of the rest of this function). 2175 * Set up new rate table in uCode only if old rate is not supported 2176 * in current association (use new rate found above). 2177 */ 2178 fail_count = window->counter - window->success_counter; 2179 if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) && 2180 (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) { 2181 IWL_DEBUG_RATE(mvm, 2182 "%s: Test Window: succ %d total %d\n", 2183 rs_pretty_rate(rate), 2184 window->success_counter, window->counter); 2185 2186 /* Can't calculate this yet; not enough history */ 2187 window->average_tpt = IWL_INVALID_VALUE; 2188 2189 /* Should we stay with this modulation mode, 2190 * or search for a new one? */ 2191 rs_stay_in_table(lq_sta, false); 2192 2193 return; 2194 } 2195 2196 /* If we are searching for better modulation mode, check success. */ 2197 if (lq_sta->search_better_tbl) { 2198 /* If good success, continue using the "search" mode; 2199 * no need to send new link quality command, since we're 2200 * continuing to use the setup that we've been trying. */ 2201 if (window->average_tpt > lq_sta->last_tpt) { 2202 IWL_DEBUG_RATE(mvm, 2203 "SWITCHING TO NEW TABLE SR: %d " 2204 "cur-tpt %d old-tpt %d\n", 2205 window->success_ratio, 2206 window->average_tpt, 2207 lq_sta->last_tpt); 2208 2209 /* Swap tables; "search" becomes "active" */ 2210 lq_sta->active_tbl = active_tbl; 2211 current_tpt = window->average_tpt; 2212 /* Else poor success; go back to mode in "active" table */ 2213 } else { 2214 IWL_DEBUG_RATE(mvm, 2215 "GOING BACK TO THE OLD TABLE: SR %d " 2216 "cur-tpt %d old-tpt %d\n", 2217 window->success_ratio, 2218 window->average_tpt, 2219 lq_sta->last_tpt); 2220 2221 /* Nullify "search" table */ 2222 rate->type = LQ_NONE; 2223 2224 /* Revert to "active" table */ 2225 active_tbl = lq_sta->active_tbl; 2226 tbl = &(lq_sta->lq_info[active_tbl]); 2227 2228 /* Revert to "active" rate and throughput info */ 2229 index = tbl->rate.index; 2230 current_tpt = lq_sta->last_tpt; 2231 2232 /* Need to set up a new rate table in uCode */ 2233 update_lq = 1; 2234 } 2235 2236 /* Either way, we've made a decision; modulation mode 2237 * search is done, allow rate adjustment next time. */ 2238 lq_sta->search_better_tbl = 0; 2239 done_search = 1; /* Don't switch modes below! */ 2240 goto lq_update; 2241 } 2242 2243 /* (Else) not in search of better modulation mode, try for better 2244 * starting rate, while staying in this mode. */ 2245 high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type); 2246 low = high_low & 0xff; 2247 high = (high_low >> 8) & 0xff; 2248 2249 /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */ 2250 2251 sr = window->success_ratio; 2252 2253 /* Collect measured throughputs for current and adjacent rates */ 2254 current_tpt = window->average_tpt; 2255 if (low != IWL_RATE_INVALID) 2256 low_tpt = tbl->win[low].average_tpt; 2257 if (high != IWL_RATE_INVALID) 2258 high_tpt = tbl->win[high].average_tpt; 2259 2260 IWL_DEBUG_RATE(mvm, 2261 "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n", 2262 rs_pretty_rate(rate), current_tpt, sr, 2263 low, high, low_tpt, high_tpt); 2264 2265 scale_action = rs_get_rate_action(mvm, tbl, sr, low, high, 2266 current_tpt, low_tpt, high_tpt); 2267 2268 /* Force a search in case BT doesn't like us being in MIMO */ 2269 if (is_mimo(rate) && 2270 !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) { 2271 IWL_DEBUG_RATE(mvm, 2272 "BT Coex forbids MIMO. Search for new config\n"); 2273 rs_stay_in_table(lq_sta, true); 2274 goto lq_update; 2275 } 2276 2277 switch (scale_action) { 2278 case RS_ACTION_DOWNSCALE: 2279 /* Decrease starting rate, update uCode's rate table */ 2280 if (low != IWL_RATE_INVALID) { 2281 update_lq = 1; 2282 index = low; 2283 } else { 2284 IWL_DEBUG_RATE(mvm, 2285 "At the bottom rate. Can't decrease\n"); 2286 } 2287 2288 break; 2289 case RS_ACTION_UPSCALE: 2290 /* Increase starting rate, update uCode's rate table */ 2291 if (high != IWL_RATE_INVALID) { 2292 update_lq = 1; 2293 index = high; 2294 } else { 2295 IWL_DEBUG_RATE(mvm, 2296 "At the top rate. Can't increase\n"); 2297 } 2298 2299 break; 2300 case RS_ACTION_STAY: 2301 /* No change */ 2302 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) 2303 update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl); 2304 break; 2305 default: 2306 break; 2307 } 2308 2309 lq_update: 2310 /* Replace uCode's rate table for the destination station. */ 2311 if (update_lq) { 2312 tbl->rate.index = index; 2313 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK) 2314 rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action); 2315 rs_set_amsdu_len(mvm, sta, tbl, scale_action); 2316 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2317 } 2318 2319 rs_stay_in_table(lq_sta, false); 2320 2321 /* 2322 * Search for new modulation mode if we're: 2323 * 1) Not changing rates right now 2324 * 2) Not just finishing up a search 2325 * 3) Allowing a new search 2326 */ 2327 if (!update_lq && !done_search && 2328 lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED 2329 && window->counter) { 2330 enum rs_column next_column; 2331 2332 /* Save current throughput to compare with "search" throughput*/ 2333 lq_sta->last_tpt = current_tpt; 2334 2335 IWL_DEBUG_RATE(mvm, 2336 "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n", 2337 update_lq, done_search, lq_sta->rs_state, 2338 window->counter); 2339 2340 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl); 2341 if (next_column != RS_COLUMN_INVALID) { 2342 int ret = rs_switch_to_column(mvm, lq_sta, sta, 2343 next_column); 2344 if (!ret) 2345 lq_sta->search_better_tbl = 1; 2346 } else { 2347 IWL_DEBUG_RATE(mvm, 2348 "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n"); 2349 lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED; 2350 } 2351 2352 /* If new "search" mode was selected, set up in uCode table */ 2353 if (lq_sta->search_better_tbl) { 2354 /* Access the "search" table, clear its history. */ 2355 tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 2356 rs_rate_scale_clear_tbl_windows(mvm, tbl); 2357 2358 /* Use new "search" start rate */ 2359 index = tbl->rate.index; 2360 2361 rs_dump_rate(mvm, &tbl->rate, 2362 "Switch to SEARCH TABLE:"); 2363 rs_update_rate_tbl(mvm, sta, lq_sta, tbl); 2364 } else { 2365 done_search = 1; 2366 } 2367 } 2368 2369 if (!ndp) 2370 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta); 2371 2372 if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) { 2373 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]); 2374 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta); 2375 } 2376 } 2377 2378 struct rs_init_rate_info { 2379 s8 rssi; 2380 u8 rate_idx; 2381 }; 2382 2383 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = { 2384 { -60, IWL_RATE_54M_INDEX }, 2385 { -64, IWL_RATE_48M_INDEX }, 2386 { -68, IWL_RATE_36M_INDEX }, 2387 { -80, IWL_RATE_24M_INDEX }, 2388 { -84, IWL_RATE_18M_INDEX }, 2389 { -85, IWL_RATE_12M_INDEX }, 2390 { -86, IWL_RATE_11M_INDEX }, 2391 { -88, IWL_RATE_5M_INDEX }, 2392 { -90, IWL_RATE_2M_INDEX }, 2393 { S8_MIN, IWL_RATE_1M_INDEX }, 2394 }; 2395 2396 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = { 2397 { -60, IWL_RATE_54M_INDEX }, 2398 { -64, IWL_RATE_48M_INDEX }, 2399 { -72, IWL_RATE_36M_INDEX }, 2400 { -80, IWL_RATE_24M_INDEX }, 2401 { -84, IWL_RATE_18M_INDEX }, 2402 { -85, IWL_RATE_12M_INDEX }, 2403 { -87, IWL_RATE_9M_INDEX }, 2404 { S8_MIN, IWL_RATE_6M_INDEX }, 2405 }; 2406 2407 static const struct rs_init_rate_info rs_optimal_rates_ht[] = { 2408 { -60, IWL_RATE_MCS_7_INDEX }, 2409 { -64, IWL_RATE_MCS_6_INDEX }, 2410 { -68, IWL_RATE_MCS_5_INDEX }, 2411 { -72, IWL_RATE_MCS_4_INDEX }, 2412 { -80, IWL_RATE_MCS_3_INDEX }, 2413 { -84, IWL_RATE_MCS_2_INDEX }, 2414 { -85, IWL_RATE_MCS_1_INDEX }, 2415 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2416 }; 2417 2418 /* MCS index 9 is not valid for 20MHz VHT channel width, 2419 * but is ok for 40, 80 and 160MHz channels. 2420 */ 2421 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = { 2422 { -60, IWL_RATE_MCS_8_INDEX }, 2423 { -64, IWL_RATE_MCS_7_INDEX }, 2424 { -68, IWL_RATE_MCS_6_INDEX }, 2425 { -72, IWL_RATE_MCS_5_INDEX }, 2426 { -80, IWL_RATE_MCS_4_INDEX }, 2427 { -84, IWL_RATE_MCS_3_INDEX }, 2428 { -85, IWL_RATE_MCS_2_INDEX }, 2429 { -87, IWL_RATE_MCS_1_INDEX }, 2430 { S8_MIN, IWL_RATE_MCS_0_INDEX}, 2431 }; 2432 2433 static const struct rs_init_rate_info rs_optimal_rates_vht[] = { 2434 { -60, IWL_RATE_MCS_9_INDEX }, 2435 { -64, IWL_RATE_MCS_8_INDEX }, 2436 { -68, IWL_RATE_MCS_7_INDEX }, 2437 { -72, IWL_RATE_MCS_6_INDEX }, 2438 { -80, IWL_RATE_MCS_5_INDEX }, 2439 { -84, IWL_RATE_MCS_4_INDEX }, 2440 { -85, IWL_RATE_MCS_3_INDEX }, 2441 { -87, IWL_RATE_MCS_2_INDEX }, 2442 { -88, IWL_RATE_MCS_1_INDEX }, 2443 { S8_MIN, IWL_RATE_MCS_0_INDEX }, 2444 }; 2445 2446 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */ 2447 2448 /* Init the optimal rate based on STA caps 2449 * This combined with rssi is used to report the last tx rate 2450 * to userspace when we haven't transmitted enough frames. 2451 */ 2452 static void rs_init_optimal_rate(struct iwl_mvm *mvm, 2453 struct ieee80211_sta *sta, 2454 struct iwl_lq_sta *lq_sta) 2455 { 2456 struct rs_rate *rate = &lq_sta->optimal_rate; 2457 2458 if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID) 2459 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2; 2460 else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID) 2461 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO; 2462 else if (lq_sta->band == NL80211_BAND_5GHZ) 2463 rate->type = LQ_LEGACY_A; 2464 else 2465 rate->type = LQ_LEGACY_G; 2466 2467 rate->bw = rs_bw_from_sta_bw(sta); 2468 rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL); 2469 2470 /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */ 2471 2472 if (is_mimo(rate)) { 2473 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate; 2474 } else if (is_siso(rate)) { 2475 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate; 2476 } else { 2477 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate; 2478 2479 if (lq_sta->band == NL80211_BAND_5GHZ) { 2480 lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy; 2481 lq_sta->optimal_nentries = 2482 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2483 } else { 2484 lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy; 2485 lq_sta->optimal_nentries = 2486 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2487 } 2488 } 2489 2490 if (is_vht(rate)) { 2491 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) { 2492 lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz; 2493 lq_sta->optimal_nentries = 2494 ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2495 } else { 2496 lq_sta->optimal_rates = rs_optimal_rates_vht; 2497 lq_sta->optimal_nentries = 2498 ARRAY_SIZE(rs_optimal_rates_vht); 2499 } 2500 } else if (is_ht(rate)) { 2501 lq_sta->optimal_rates = rs_optimal_rates_ht; 2502 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2503 } 2504 } 2505 2506 /* Compute the optimal rate index based on RSSI */ 2507 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm, 2508 struct iwl_lq_sta *lq_sta) 2509 { 2510 struct rs_rate *rate = &lq_sta->optimal_rate; 2511 int i; 2512 2513 rate->index = find_first_bit(&lq_sta->optimal_rate_mask, 2514 BITS_PER_LONG); 2515 2516 for (i = 0; i < lq_sta->optimal_nentries; i++) { 2517 int rate_idx = lq_sta->optimal_rates[i].rate_idx; 2518 2519 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) && 2520 (BIT(rate_idx) & lq_sta->optimal_rate_mask)) { 2521 rate->index = rate_idx; 2522 break; 2523 } 2524 } 2525 2526 return rate; 2527 } 2528 2529 /* Choose an initial legacy rate and antenna to use based on the RSSI 2530 * of last Rx 2531 */ 2532 static void rs_get_initial_rate(struct iwl_mvm *mvm, 2533 struct ieee80211_sta *sta, 2534 struct iwl_lq_sta *lq_sta, 2535 enum nl80211_band band, 2536 struct rs_rate *rate) 2537 { 2538 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2539 int i, nentries; 2540 unsigned long active_rate; 2541 s8 best_rssi = S8_MIN; 2542 u8 best_ant = ANT_NONE; 2543 u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 2544 const struct rs_init_rate_info *initial_rates; 2545 2546 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2547 if (!(lq_sta->pers.chains & BIT(i))) 2548 continue; 2549 2550 if (lq_sta->pers.chain_signal[i] > best_rssi) { 2551 best_rssi = lq_sta->pers.chain_signal[i]; 2552 best_ant = BIT(i); 2553 } 2554 } 2555 2556 IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n", 2557 rs_pretty_ant(best_ant), best_rssi); 2558 2559 if (best_ant != ANT_A && best_ant != ANT_B) 2560 rate->ant = first_antenna(valid_tx_ant); 2561 else 2562 rate->ant = best_ant; 2563 2564 rate->sgi = false; 2565 rate->ldpc = false; 2566 rate->bw = RATE_MCS_CHAN_WIDTH_20; 2567 2568 rate->index = find_first_bit(&lq_sta->active_legacy_rate, 2569 BITS_PER_LONG); 2570 2571 if (band == NL80211_BAND_5GHZ) { 2572 rate->type = LQ_LEGACY_A; 2573 initial_rates = rs_optimal_rates_5ghz_legacy; 2574 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy); 2575 } else { 2576 rate->type = LQ_LEGACY_G; 2577 initial_rates = rs_optimal_rates_24ghz_legacy; 2578 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy); 2579 } 2580 2581 if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE) 2582 goto out; 2583 2584 /* Start from a higher rate if the corresponding debug capability 2585 * is enabled. The rate is chosen according to AP capabilities. 2586 * In case of VHT/HT when the rssi is low fallback to the case of 2587 * legacy rates. 2588 */ 2589 if (sta->vht_cap.vht_supported && 2590 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2591 /* 2592 * In AP mode, when a new station associates, rs is initialized 2593 * immediately upon association completion, before the phy 2594 * context is updated with the association parameters, so the 2595 * sta bandwidth might be wider than the phy context allows. 2596 * To avoid this issue, always initialize rs with 20mhz 2597 * bandwidth rate, and after authorization, when the phy context 2598 * is already up-to-date, re-init rs with the correct bw. 2599 */ 2600 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ? 2601 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta); 2602 2603 switch (bw) { 2604 case RATE_MCS_CHAN_WIDTH_40: 2605 case RATE_MCS_CHAN_WIDTH_80: 2606 case RATE_MCS_CHAN_WIDTH_160: 2607 initial_rates = rs_optimal_rates_vht; 2608 nentries = ARRAY_SIZE(rs_optimal_rates_vht); 2609 break; 2610 case RATE_MCS_CHAN_WIDTH_20: 2611 initial_rates = rs_optimal_rates_vht_20mhz; 2612 nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz); 2613 break; 2614 default: 2615 IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth); 2616 goto out; 2617 } 2618 2619 active_rate = lq_sta->active_siso_rate; 2620 rate->type = LQ_VHT_SISO; 2621 rate->bw = bw; 2622 } else if (sta->ht_cap.ht_supported && 2623 best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) { 2624 initial_rates = rs_optimal_rates_ht; 2625 nentries = ARRAY_SIZE(rs_optimal_rates_ht); 2626 active_rate = lq_sta->active_siso_rate; 2627 rate->type = LQ_HT_SISO; 2628 } else { 2629 active_rate = lq_sta->active_legacy_rate; 2630 } 2631 2632 for (i = 0; i < nentries; i++) { 2633 int rate_idx = initial_rates[i].rate_idx; 2634 2635 if ((best_rssi >= initial_rates[i].rssi) && 2636 (BIT(rate_idx) & active_rate)) { 2637 rate->index = rate_idx; 2638 break; 2639 } 2640 } 2641 2642 out: 2643 rs_dump_rate(mvm, rate, "INITIAL"); 2644 } 2645 2646 /* Save info about RSSI of last Rx */ 2647 void rs_update_last_rssi(struct iwl_mvm *mvm, 2648 struct iwl_mvm_sta *mvmsta, 2649 struct ieee80211_rx_status *rx_status) 2650 { 2651 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2652 int i; 2653 2654 lq_sta->pers.chains = rx_status->chains; 2655 lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0]; 2656 lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1]; 2657 lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2]; 2658 lq_sta->pers.last_rssi = S8_MIN; 2659 2660 for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) { 2661 if (!(lq_sta->pers.chains & BIT(i))) 2662 continue; 2663 2664 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi) 2665 lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i]; 2666 } 2667 } 2668 2669 /* 2670 * rs_initialize_lq - Initialize a station's hardware rate table 2671 * 2672 * The uCode's station table contains a table of fallback rates 2673 * for automatic fallback during transmission. 2674 * 2675 * NOTE: This sets up a default set of values. These will be replaced later 2676 * if the driver's iwl-agn-rs rate scaling algorithm is used, instead of 2677 * rc80211_simple. 2678 * 2679 * NOTE: Run REPLY_ADD_STA command to set up station table entry, before 2680 * calling this function (which runs REPLY_TX_LINK_QUALITY_CMD, 2681 * which requires station table entry to exist). 2682 */ 2683 static void rs_initialize_lq(struct iwl_mvm *mvm, 2684 struct ieee80211_sta *sta, 2685 struct iwl_lq_sta *lq_sta, 2686 enum nl80211_band band) 2687 { 2688 struct iwl_scale_tbl_info *tbl; 2689 struct rs_rate *rate; 2690 u8 active_tbl = 0; 2691 2692 if (!sta || !lq_sta) 2693 return; 2694 2695 if (!lq_sta->search_better_tbl) 2696 active_tbl = lq_sta->active_tbl; 2697 else 2698 active_tbl = rs_search_tbl(lq_sta->active_tbl); 2699 2700 tbl = &(lq_sta->lq_info[active_tbl]); 2701 rate = &tbl->rate; 2702 2703 rs_get_initial_rate(mvm, sta, lq_sta, band, rate); 2704 rs_init_optimal_rate(mvm, sta, lq_sta); 2705 2706 WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B, 2707 "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n", 2708 rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant, 2709 mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID); 2710 2711 tbl->column = rs_get_column_from_rate(rate); 2712 2713 rs_set_expected_tpt_table(lq_sta, tbl); 2714 rs_fill_lq_cmd(mvm, sta, lq_sta, rate); 2715 /* TODO restore station should remember the lq cmd */ 2716 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 2717 } 2718 2719 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta, 2720 void *mvm_sta, 2721 struct ieee80211_tx_rate_control *txrc) 2722 { 2723 struct iwl_op_mode *op_mode = mvm_r; 2724 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 2725 struct sk_buff *skb = txrc->skb; 2726 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2727 struct iwl_lq_sta *lq_sta; 2728 struct rs_rate *optimal_rate; 2729 u32 last_ucode_rate; 2730 2731 if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) { 2732 /* if vif isn't initialized mvm doesn't know about 2733 * this station, so don't do anything with the it 2734 */ 2735 sta = NULL; 2736 mvm_sta = NULL; 2737 } 2738 2739 if (!mvm_sta) 2740 return; 2741 2742 lq_sta = mvm_sta; 2743 iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags, 2744 info->band, &info->control.rates[0]); 2745 info->control.rates[0].count = 1; 2746 2747 /* Report the optimal rate based on rssi and STA caps if we haven't 2748 * converged yet (too little traffic) or exploring other modulations 2749 */ 2750 if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) { 2751 optimal_rate = rs_get_optimal_rate(mvm, lq_sta); 2752 last_ucode_rate = ucode_rate_from_rs_rate(mvm, 2753 optimal_rate); 2754 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band, 2755 &txrc->reported_rate); 2756 } 2757 } 2758 2759 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta, 2760 gfp_t gfp) 2761 { 2762 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2763 struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate; 2764 struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode); 2765 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2766 2767 IWL_DEBUG_RATE(mvm, "create station rate scale window\n"); 2768 2769 lq_sta->pers.drv = mvm; 2770 #ifdef CONFIG_MAC80211_DEBUGFS 2771 lq_sta->pers.dbg_fixed_rate = 0; 2772 lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID; 2773 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 2774 #endif 2775 lq_sta->pers.chains = 0; 2776 memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal)); 2777 lq_sta->pers.last_rssi = S8_MIN; 2778 2779 return lq_sta; 2780 } 2781 2782 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap, 2783 int nss) 2784 { 2785 u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) & 2786 (0x3 << (2 * (nss - 1))); 2787 rx_mcs >>= (2 * (nss - 1)); 2788 2789 if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7) 2790 return IWL_RATE_MCS_7_INDEX; 2791 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8) 2792 return IWL_RATE_MCS_8_INDEX; 2793 else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9) 2794 return IWL_RATE_MCS_9_INDEX; 2795 2796 WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED); 2797 return -1; 2798 } 2799 2800 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta, 2801 struct ieee80211_sta_vht_cap *vht_cap, 2802 struct iwl_lq_sta *lq_sta) 2803 { 2804 int i; 2805 int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1); 2806 2807 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2808 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2809 if (i == IWL_RATE_9M_INDEX) 2810 continue; 2811 2812 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2813 if (i == IWL_RATE_MCS_9_INDEX && 2814 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2815 continue; 2816 2817 lq_sta->active_siso_rate |= BIT(i); 2818 } 2819 } 2820 2821 if (sta->rx_nss < 2) 2822 return; 2823 2824 highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2); 2825 if (highest_mcs >= IWL_RATE_MCS_0_INDEX) { 2826 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) { 2827 if (i == IWL_RATE_9M_INDEX) 2828 continue; 2829 2830 /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */ 2831 if (i == IWL_RATE_MCS_9_INDEX && 2832 sta->bandwidth == IEEE80211_STA_RX_BW_20) 2833 continue; 2834 2835 lq_sta->active_mimo2_rate |= BIT(i); 2836 } 2837 } 2838 } 2839 2840 static void rs_ht_init(struct iwl_mvm *mvm, 2841 struct ieee80211_sta *sta, 2842 struct iwl_lq_sta *lq_sta, 2843 struct ieee80211_sta_ht_cap *ht_cap) 2844 { 2845 /* active_siso_rate mask includes 9 MBits (bit 5), 2846 * and CCK (bits 0-3), supp_rates[] does not; 2847 * shift to convert format, force 9 MBits off. 2848 */ 2849 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1; 2850 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1; 2851 lq_sta->active_siso_rate &= ~((u16)0x2); 2852 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE; 2853 2854 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1; 2855 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1; 2856 lq_sta->active_mimo2_rate &= ~((u16)0x2); 2857 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE; 2858 2859 if (mvm->cfg->ht_params->ldpc && 2860 (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING)) 2861 lq_sta->ldpc = true; 2862 2863 if (mvm->cfg->ht_params->stbc && 2864 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2865 (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC)) 2866 lq_sta->stbc_capable = true; 2867 2868 lq_sta->is_vht = false; 2869 } 2870 2871 static void rs_vht_init(struct iwl_mvm *mvm, 2872 struct ieee80211_sta *sta, 2873 struct iwl_lq_sta *lq_sta, 2874 struct ieee80211_sta_vht_cap *vht_cap) 2875 { 2876 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta); 2877 2878 if (mvm->cfg->ht_params->ldpc && 2879 (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC)) 2880 lq_sta->ldpc = true; 2881 2882 if (mvm->cfg->ht_params->stbc && 2883 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2884 (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK)) 2885 lq_sta->stbc_capable = true; 2886 2887 if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) && 2888 (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) && 2889 (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)) 2890 lq_sta->bfer_capable = true; 2891 2892 lq_sta->is_vht = true; 2893 } 2894 2895 #ifdef CONFIG_IWLWIFI_DEBUGFS 2896 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm) 2897 { 2898 spin_lock_bh(&mvm->drv_stats_lock); 2899 memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats)); 2900 spin_unlock_bh(&mvm->drv_stats_lock); 2901 } 2902 2903 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg) 2904 { 2905 u8 nss = 0; 2906 2907 spin_lock(&mvm->drv_stats_lock); 2908 2909 if (agg) 2910 mvm->drv_rx_stats.agg_frames++; 2911 2912 mvm->drv_rx_stats.success_frames++; 2913 2914 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 2915 case RATE_MCS_CHAN_WIDTH_20: 2916 mvm->drv_rx_stats.bw_20_frames++; 2917 break; 2918 case RATE_MCS_CHAN_WIDTH_40: 2919 mvm->drv_rx_stats.bw_40_frames++; 2920 break; 2921 case RATE_MCS_CHAN_WIDTH_80: 2922 mvm->drv_rx_stats.bw_80_frames++; 2923 break; 2924 case RATE_MCS_CHAN_WIDTH_160: 2925 mvm->drv_rx_stats.bw_160_frames++; 2926 break; 2927 default: 2928 WARN_ONCE(1, "bad BW. rate 0x%x", rate); 2929 } 2930 2931 if (rate & RATE_MCS_HT_MSK) { 2932 mvm->drv_rx_stats.ht_frames++; 2933 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1; 2934 } else if (rate & RATE_MCS_VHT_MSK) { 2935 mvm->drv_rx_stats.vht_frames++; 2936 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >> 2937 RATE_VHT_MCS_NSS_POS) + 1; 2938 } else { 2939 mvm->drv_rx_stats.legacy_frames++; 2940 } 2941 2942 if (nss == 1) 2943 mvm->drv_rx_stats.siso_frames++; 2944 else if (nss == 2) 2945 mvm->drv_rx_stats.mimo2_frames++; 2946 2947 if (rate & RATE_MCS_SGI_MSK) 2948 mvm->drv_rx_stats.sgi_frames++; 2949 else 2950 mvm->drv_rx_stats.ngi_frames++; 2951 2952 mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate; 2953 mvm->drv_rx_stats.last_frame_idx = 2954 (mvm->drv_rx_stats.last_frame_idx + 1) % 2955 ARRAY_SIZE(mvm->drv_rx_stats.last_rates); 2956 2957 spin_unlock(&mvm->drv_stats_lock); 2958 } 2959 #endif 2960 2961 /* 2962 * Called after adding a new station to initialize rate scaling 2963 */ 2964 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 2965 enum nl80211_band band) 2966 { 2967 int i, j; 2968 struct ieee80211_hw *hw = mvm->hw; 2969 struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap; 2970 struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap; 2971 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 2972 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 2973 struct ieee80211_supported_band *sband; 2974 unsigned long supp; /* must be unsigned long for for_each_set_bit */ 2975 2976 lockdep_assert_held(&mvmsta->lq_sta.rs_drv.pers.lock); 2977 2978 /* clear all non-persistent lq data */ 2979 memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers)); 2980 2981 sband = hw->wiphy->bands[band]; 2982 2983 lq_sta->lq.sta_id = mvmsta->sta_id; 2984 mvmsta->amsdu_enabled = 0; 2985 mvmsta->max_amsdu_len = sta->max_amsdu_len; 2986 2987 for (j = 0; j < LQ_SIZE; j++) 2988 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]); 2989 2990 lq_sta->flush_timer = 0; 2991 lq_sta->last_tx = jiffies; 2992 2993 IWL_DEBUG_RATE(mvm, 2994 "LQ: *** rate scale station global init for station %d ***\n", 2995 mvmsta->sta_id); 2996 /* TODO: what is a good starting rate for STA? About middle? Maybe not 2997 * the lowest or the highest rate.. Could consider using RSSI from 2998 * previous packets? Need to have IEEE 802.1X auth succeed immediately 2999 * after assoc.. */ 3000 3001 lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX; 3002 lq_sta->band = sband->band; 3003 /* 3004 * active legacy rates as per supported rates bitmap 3005 */ 3006 supp = sta->supp_rates[sband->band]; 3007 lq_sta->active_legacy_rate = 0; 3008 for_each_set_bit(i, &supp, BITS_PER_LONG) 3009 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value); 3010 3011 /* TODO: should probably account for rx_highest for both HT/VHT */ 3012 if (!vht_cap || !vht_cap->vht_supported) 3013 rs_ht_init(mvm, sta, lq_sta, ht_cap); 3014 else 3015 rs_vht_init(mvm, sta, lq_sta, vht_cap); 3016 3017 lq_sta->max_legacy_rate_idx = 3018 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate); 3019 lq_sta->max_siso_rate_idx = 3020 rs_get_max_rate_from_mask(lq_sta->active_siso_rate); 3021 lq_sta->max_mimo2_rate_idx = 3022 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate); 3023 3024 IWL_DEBUG_RATE(mvm, 3025 "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n", 3026 lq_sta->active_legacy_rate, 3027 lq_sta->active_siso_rate, 3028 lq_sta->active_mimo2_rate, 3029 lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable, 3030 lq_sta->bfer_capable); 3031 IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n", 3032 lq_sta->max_legacy_rate_idx, 3033 lq_sta->max_siso_rate_idx, 3034 lq_sta->max_mimo2_rate_idx); 3035 3036 /* These values will be overridden later */ 3037 lq_sta->lq.single_stream_ant_msk = 3038 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm)); 3039 lq_sta->lq.dual_stream_ant_msk = ANT_AB; 3040 3041 /* as default allow aggregation for all tids */ 3042 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID; 3043 lq_sta->is_agg = 0; 3044 #ifdef CONFIG_IWLWIFI_DEBUGFS 3045 iwl_mvm_reset_frame_stats(mvm); 3046 #endif 3047 rs_initialize_lq(mvm, sta, lq_sta, band); 3048 } 3049 3050 static void rs_drv_rate_update(void *mvm_r, 3051 struct ieee80211_supported_band *sband, 3052 struct cfg80211_chan_def *chandef, 3053 struct ieee80211_sta *sta, 3054 void *priv_sta, u32 changed) 3055 { 3056 struct iwl_op_mode *op_mode = mvm_r; 3057 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3058 u8 tid; 3059 3060 if (!iwl_mvm_sta_from_mac80211(sta)->vif) 3061 return; 3062 3063 /* Stop any ongoing aggregations as rs starts off assuming no agg */ 3064 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++) 3065 ieee80211_stop_tx_ba_session(sta, tid); 3066 3067 iwl_mvm_rs_rate_init(mvm, sta, sband->band, true); 3068 } 3069 3070 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, 3071 struct ieee80211_sta *sta, 3072 int tid, struct ieee80211_tx_info *info, 3073 bool ndp) 3074 { 3075 int legacy_success; 3076 int retries; 3077 int i; 3078 struct iwl_lq_cmd *table; 3079 u32 lq_hwrate; 3080 struct rs_rate lq_rate, tx_resp_rate; 3081 struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl; 3082 u32 tlc_info = (uintptr_t)info->status.status_driver_data[0]; 3083 u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK; 3084 u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info); 3085 u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1]; 3086 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3087 struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv; 3088 3089 if (!lq_sta->pers.drv) { 3090 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n"); 3091 return; 3092 } 3093 3094 /* This packet was aggregated but doesn't carry status info */ 3095 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 3096 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 3097 return; 3098 3099 if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band, 3100 &tx_resp_rate)) { 3101 WARN_ON_ONCE(1); 3102 return; 3103 } 3104 3105 #ifdef CONFIG_MAC80211_DEBUGFS 3106 /* Disable last tx check if we are debugging with fixed rate but 3107 * update tx stats 3108 */ 3109 if (lq_sta->pers.dbg_fixed_rate) { 3110 int index = tx_resp_rate.index; 3111 enum rs_column column; 3112 int attempts, success; 3113 3114 column = rs_get_column_from_rate(&tx_resp_rate); 3115 if (WARN_ONCE(column == RS_COLUMN_INVALID, 3116 "Can't map rate 0x%x to column", 3117 tx_resp_hwrate)) 3118 return; 3119 3120 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3121 attempts = info->status.ampdu_len; 3122 success = info->status.ampdu_ack_len; 3123 } else { 3124 attempts = info->status.rates[0].count; 3125 success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3126 } 3127 3128 lq_sta->pers.tx_stats[column][index].total += attempts; 3129 lq_sta->pers.tx_stats[column][index].success += success; 3130 3131 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n", 3132 tx_resp_hwrate, success, attempts); 3133 return; 3134 } 3135 #endif 3136 3137 if (time_after(jiffies, 3138 (unsigned long)(lq_sta->last_tx + 3139 (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) { 3140 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n"); 3141 /* reach here only in case of driver RS, call directly 3142 * the unlocked version 3143 */ 3144 rs_drv_rate_init(mvm, sta, info->band); 3145 return; 3146 } 3147 lq_sta->last_tx = jiffies; 3148 3149 /* Ignore this Tx frame response if its initial rate doesn't match 3150 * that of latest Link Quality command. There may be stragglers 3151 * from a previous Link Quality command, but we're no longer interested 3152 * in those; they're either from the "active" mode while we're trying 3153 * to check "search" mode, or a prior "search" mode after we've moved 3154 * to a new "search" mode (which might become the new "active" mode). 3155 */ 3156 table = &lq_sta->lq; 3157 lq_hwrate = le32_to_cpu(table->rs_table[0]); 3158 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) { 3159 WARN_ON_ONCE(1); 3160 return; 3161 } 3162 3163 /* Here we actually compare this rate to the latest LQ command */ 3164 if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) { 3165 IWL_DEBUG_RATE(mvm, 3166 "tx resp color 0x%x does not match 0x%x\n", 3167 lq_color, LQ_FLAG_COLOR_GET(table->flags)); 3168 3169 /* Since rates mis-match, the last LQ command may have failed. 3170 * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with 3171 * ... driver. 3172 */ 3173 lq_sta->missed_rate_counter++; 3174 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) { 3175 lq_sta->missed_rate_counter = 0; 3176 IWL_DEBUG_RATE(mvm, 3177 "Too many rates mismatch. Send sync LQ. rs_state %d\n", 3178 lq_sta->rs_state); 3179 iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq); 3180 } 3181 /* Regardless, ignore this status info for outdated rate */ 3182 return; 3183 } 3184 3185 /* Rate did match, so reset the missed_rate_counter */ 3186 lq_sta->missed_rate_counter = 0; 3187 3188 if (!lq_sta->search_better_tbl) { 3189 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3190 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3191 } else { 3192 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3193 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3194 } 3195 3196 if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) { 3197 IWL_DEBUG_RATE(mvm, 3198 "Neither active nor search matches tx rate\n"); 3199 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl]; 3200 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE"); 3201 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)]; 3202 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH"); 3203 rs_dump_rate(mvm, &lq_rate, "ACTUAL"); 3204 3205 /* no matching table found, let's by-pass the data collection 3206 * and continue to perform rate scale to find the rate table 3207 */ 3208 rs_stay_in_table(lq_sta, true); 3209 goto done; 3210 } 3211 3212 /* Updating the frame history depends on whether packets were 3213 * aggregated. 3214 * 3215 * For aggregation, all packets were transmitted at the same rate, the 3216 * first index into rate scale table. 3217 */ 3218 if (info->flags & IEEE80211_TX_STAT_AMPDU) { 3219 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index, 3220 info->status.ampdu_len, 3221 info->status.ampdu_ack_len, 3222 reduced_txp); 3223 3224 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat 3225 * it as a single frame loss as we don't want the success ratio 3226 * to dip too quickly because a BA wasn't received. 3227 * For TPC, there's no need for this optimisation since we want 3228 * to recover very quickly from a bad power reduction and, 3229 * therefore we'd like the success ratio to get an immediate hit 3230 * when failing to get a BA, so we'd switch back to a lower or 3231 * zero power reduction. When FW transmits agg with a rate 3232 * different from the initial rate, it will not use reduced txp 3233 * and will send BA notification twice (one empty with reduced 3234 * txp equal to the value from LQ and one with reduced txp 0). 3235 * We need to update counters for each txp level accordingly. 3236 */ 3237 if (info->status.ampdu_ack_len == 0) 3238 info->status.ampdu_len = 1; 3239 3240 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, 3241 tx_resp_rate.index, 3242 info->status.ampdu_len, 3243 info->status.ampdu_ack_len); 3244 3245 /* Update success/fail counts if not searching for new mode */ 3246 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3247 lq_sta->total_success += info->status.ampdu_ack_len; 3248 lq_sta->total_failed += (info->status.ampdu_len - 3249 info->status.ampdu_ack_len); 3250 } 3251 } else { 3252 /* For legacy, update frame history with for each Tx retry. */ 3253 retries = info->status.rates[0].count - 1; 3254 /* HW doesn't send more than 15 retries */ 3255 retries = min(retries, 15); 3256 3257 /* The last transmission may have been successful */ 3258 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK); 3259 /* Collect data for each rate used during failed TX attempts */ 3260 for (i = 0; i <= retries; ++i) { 3261 lq_hwrate = le32_to_cpu(table->rs_table[i]); 3262 if (rs_rate_from_ucode_rate(lq_hwrate, info->band, 3263 &lq_rate)) { 3264 WARN_ON_ONCE(1); 3265 return; 3266 } 3267 3268 /* Only collect stats if retried rate is in the same RS 3269 * table as active/search. 3270 */ 3271 if (rs_rate_column_match(&lq_rate, &curr_tbl->rate)) 3272 tmp_tbl = curr_tbl; 3273 else if (rs_rate_column_match(&lq_rate, 3274 &other_tbl->rate)) 3275 tmp_tbl = other_tbl; 3276 else 3277 continue; 3278 3279 rs_collect_tpc_data(mvm, lq_sta, tmp_tbl, 3280 tx_resp_rate.index, 1, 3281 i < retries ? 0 : legacy_success, 3282 reduced_txp); 3283 rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl, 3284 tx_resp_rate.index, 1, 3285 i < retries ? 0 : legacy_success); 3286 } 3287 3288 /* Update success/fail counts if not searching for new mode */ 3289 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) { 3290 lq_sta->total_success += legacy_success; 3291 lq_sta->total_failed += retries + (1 - legacy_success); 3292 } 3293 } 3294 /* The last TX rate is cached in lq_sta; it's set in if/else above */ 3295 lq_sta->last_rate_n_flags = lq_hwrate; 3296 IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp); 3297 done: 3298 /* See if there's a better rate or modulation mode to try. */ 3299 if (sta->supp_rates[info->band]) 3300 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp); 3301 } 3302 3303 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 3304 int tid, struct ieee80211_tx_info *info, bool ndp) 3305 { 3306 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3307 3308 /* If it's locked we are in middle of init flow 3309 * just wait for next tx status to update the lq_sta data 3310 */ 3311 if (!spin_trylock(&mvmsta->lq_sta.rs_drv.pers.lock)) 3312 return; 3313 3314 __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp); 3315 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 3316 } 3317 3318 #ifdef CONFIG_MAC80211_DEBUGFS 3319 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm, 3320 struct iwl_lq_cmd *lq_cmd, 3321 enum nl80211_band band, 3322 u32 ucode_rate) 3323 { 3324 struct rs_rate rate; 3325 int i; 3326 int num_rates = ARRAY_SIZE(lq_cmd->rs_table); 3327 __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate); 3328 u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3329 3330 for (i = 0; i < num_rates; i++) 3331 lq_cmd->rs_table[i] = ucode_rate_le32; 3332 3333 if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) { 3334 WARN_ON_ONCE(1); 3335 return; 3336 } 3337 3338 if (is_mimo(&rate)) 3339 lq_cmd->mimo_delim = num_rates - 1; 3340 else 3341 lq_cmd->mimo_delim = 0; 3342 3343 lq_cmd->reduced_tpc = 0; 3344 3345 if (num_of_ant(ant) == 1) 3346 lq_cmd->single_stream_ant_msk = ant; 3347 3348 if (!mvm->trans->trans_cfg->gen2) 3349 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF; 3350 else 3351 lq_cmd->agg_frame_cnt_limit = 3352 LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF; 3353 } 3354 #endif /* CONFIG_MAC80211_DEBUGFS */ 3355 3356 static void rs_fill_rates_for_column(struct iwl_mvm *mvm, 3357 struct iwl_lq_sta *lq_sta, 3358 struct rs_rate *rate, 3359 __le32 *rs_table, int *rs_table_index, 3360 int num_rates, int num_retries, 3361 u8 valid_tx_ant, bool toggle_ant) 3362 { 3363 int i, j; 3364 __le32 ucode_rate; 3365 bool bottom_reached = false; 3366 int prev_rate_idx = rate->index; 3367 int end = LINK_QUAL_MAX_RETRY_NUM; 3368 int index = *rs_table_index; 3369 3370 for (i = 0; i < num_rates && index < end; i++) { 3371 for (j = 0; j < num_retries && index < end; j++, index++) { 3372 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, 3373 rate)); 3374 rs_table[index] = ucode_rate; 3375 if (toggle_ant) 3376 rs_toggle_antenna(valid_tx_ant, rate); 3377 } 3378 3379 prev_rate_idx = rate->index; 3380 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate); 3381 if (bottom_reached && !is_legacy(rate)) 3382 break; 3383 } 3384 3385 if (!bottom_reached && !is_legacy(rate)) 3386 rate->index = prev_rate_idx; 3387 3388 *rs_table_index = index; 3389 } 3390 3391 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI 3392 * column the rate table should look like this: 3393 * 3394 * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3395 * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI 3396 * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3397 * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI 3398 * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3399 * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI 3400 * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI 3401 * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI 3402 * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI 3403 * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps 3404 * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps 3405 * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps 3406 * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps 3407 * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps 3408 * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps 3409 * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps 3410 */ 3411 static void rs_build_rates_table(struct iwl_mvm *mvm, 3412 struct ieee80211_sta *sta, 3413 struct iwl_lq_sta *lq_sta, 3414 const struct rs_rate *initial_rate) 3415 { 3416 struct rs_rate rate; 3417 int num_rates, num_retries, index = 0; 3418 u8 valid_tx_ant = 0; 3419 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3420 bool toggle_ant = false; 3421 u32 color; 3422 3423 memcpy(&rate, initial_rate, sizeof(rate)); 3424 3425 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm); 3426 3427 /* TODO: remove old API when min FW API hits 14 */ 3428 if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) && 3429 rs_stbc_allow(mvm, sta, lq_sta)) 3430 rate.stbc = true; 3431 3432 if (is_siso(&rate)) { 3433 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES; 3434 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3435 } else if (is_mimo(&rate)) { 3436 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES; 3437 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE; 3438 } else { 3439 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES; 3440 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES; 3441 toggle_ant = true; 3442 } 3443 3444 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3445 num_rates, num_retries, valid_tx_ant, 3446 toggle_ant); 3447 3448 rs_get_lower_rate_down_column(lq_sta, &rate); 3449 3450 if (is_siso(&rate)) { 3451 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES; 3452 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES; 3453 lq_cmd->mimo_delim = index; 3454 } else if (is_legacy(&rate)) { 3455 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3456 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3457 } else { 3458 WARN_ON_ONCE(1); 3459 } 3460 3461 toggle_ant = true; 3462 3463 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3464 num_rates, num_retries, valid_tx_ant, 3465 toggle_ant); 3466 3467 rs_get_lower_rate_down_column(lq_sta, &rate); 3468 3469 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES; 3470 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES; 3471 3472 rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index, 3473 num_rates, num_retries, valid_tx_ant, 3474 toggle_ant); 3475 3476 /* update the color of the LQ command (as a counter at bits 1-3) */ 3477 color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags)); 3478 lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color); 3479 } 3480 3481 struct rs_bfer_active_iter_data { 3482 struct ieee80211_sta *exclude_sta; 3483 struct iwl_mvm_sta *bfer_mvmsta; 3484 }; 3485 3486 static void rs_bfer_active_iter(void *_data, 3487 struct ieee80211_sta *sta) 3488 { 3489 struct rs_bfer_active_iter_data *data = _data; 3490 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3491 struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq; 3492 u32 ss_params = le32_to_cpu(lq_cmd->ss_params); 3493 3494 if (sta == data->exclude_sta) 3495 return; 3496 3497 /* The current sta has BFER allowed */ 3498 if (ss_params & LQ_SS_BFER_ALLOWED) { 3499 WARN_ON_ONCE(data->bfer_mvmsta != NULL); 3500 3501 data->bfer_mvmsta = mvmsta; 3502 } 3503 } 3504 3505 static int rs_bfer_priority(struct iwl_mvm_sta *sta) 3506 { 3507 int prio = -1; 3508 enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif); 3509 3510 switch (viftype) { 3511 case NL80211_IFTYPE_AP: 3512 case NL80211_IFTYPE_P2P_GO: 3513 prio = 3; 3514 break; 3515 case NL80211_IFTYPE_P2P_CLIENT: 3516 prio = 2; 3517 break; 3518 case NL80211_IFTYPE_STATION: 3519 prio = 1; 3520 break; 3521 default: 3522 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id); 3523 prio = -1; 3524 } 3525 3526 return prio; 3527 } 3528 3529 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */ 3530 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1, 3531 struct iwl_mvm_sta *sta2) 3532 { 3533 int prio1 = rs_bfer_priority(sta1); 3534 int prio2 = rs_bfer_priority(sta2); 3535 3536 if (prio1 > prio2) 3537 return 1; 3538 if (prio1 < prio2) 3539 return -1; 3540 return 0; 3541 } 3542 3543 static void rs_set_lq_ss_params(struct iwl_mvm *mvm, 3544 struct ieee80211_sta *sta, 3545 struct iwl_lq_sta *lq_sta, 3546 const struct rs_rate *initial_rate) 3547 { 3548 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3549 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 3550 struct rs_bfer_active_iter_data data = { 3551 .exclude_sta = sta, 3552 .bfer_mvmsta = NULL, 3553 }; 3554 struct iwl_mvm_sta *bfer_mvmsta = NULL; 3555 u32 ss_params = LQ_SS_PARAMS_VALID; 3556 3557 if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) 3558 goto out; 3559 3560 #ifdef CONFIG_MAC80211_DEBUGFS 3561 /* Check if forcing the decision is configured. 3562 * Note that SISO is forced by not allowing STBC or BFER 3563 */ 3564 if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC) 3565 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE); 3566 else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER) 3567 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE); 3568 3569 if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) { 3570 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n", 3571 lq_sta->pers.ss_force); 3572 goto out; 3573 } 3574 #endif 3575 3576 if (lq_sta->stbc_capable) 3577 ss_params |= LQ_SS_STBC_1SS_ALLOWED; 3578 3579 if (!lq_sta->bfer_capable) 3580 goto out; 3581 3582 ieee80211_iterate_stations_atomic(mvm->hw, 3583 rs_bfer_active_iter, 3584 &data); 3585 bfer_mvmsta = data.bfer_mvmsta; 3586 3587 /* This code is safe as it doesn't run concurrently for different 3588 * stations. This is guaranteed by the fact that calls to 3589 * ieee80211_tx_status wouldn't run concurrently for a single HW. 3590 */ 3591 if (!bfer_mvmsta) { 3592 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n"); 3593 3594 ss_params |= LQ_SS_BFER_ALLOWED; 3595 goto out; 3596 } 3597 3598 IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n", 3599 bfer_mvmsta->sta_id); 3600 3601 /* Disallow BFER on another STA if active and we're a higher priority */ 3602 if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) { 3603 struct iwl_lq_cmd *bfersta_lq_cmd = 3604 &bfer_mvmsta->lq_sta.rs_drv.lq; 3605 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params); 3606 3607 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED; 3608 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params); 3609 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd); 3610 3611 ss_params |= LQ_SS_BFER_ALLOWED; 3612 IWL_DEBUG_RATE(mvm, 3613 "Lower priority BFER sta found (%d). Switch BFER\n", 3614 bfer_mvmsta->sta_id); 3615 } 3616 out: 3617 lq_cmd->ss_params = cpu_to_le32(ss_params); 3618 } 3619 3620 static void rs_fill_lq_cmd(struct iwl_mvm *mvm, 3621 struct ieee80211_sta *sta, 3622 struct iwl_lq_sta *lq_sta, 3623 const struct rs_rate *initial_rate) 3624 { 3625 struct iwl_lq_cmd *lq_cmd = &lq_sta->lq; 3626 struct iwl_mvm_sta *mvmsta; 3627 struct iwl_mvm_vif *mvmvif; 3628 3629 lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START; 3630 lq_cmd->agg_time_limit = 3631 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT); 3632 3633 #ifdef CONFIG_MAC80211_DEBUGFS 3634 if (lq_sta->pers.dbg_fixed_rate) { 3635 rs_build_rates_table_from_fixed(mvm, lq_cmd, 3636 lq_sta->band, 3637 lq_sta->pers.dbg_fixed_rate); 3638 return; 3639 } 3640 #endif 3641 if (WARN_ON_ONCE(!sta || !initial_rate)) 3642 return; 3643 3644 rs_build_rates_table(mvm, sta, lq_sta, initial_rate); 3645 3646 if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS)) 3647 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate); 3648 3649 mvmsta = iwl_mvm_sta_from_mac80211(sta); 3650 mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 3651 3652 if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) && 3653 num_of_ant(initial_rate->ant) == 1) 3654 lq_cmd->single_stream_ant_msk = initial_rate->ant; 3655 3656 lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize; 3657 3658 /* 3659 * In case of low latency, tell the firmware to leave a frame in the 3660 * Tx Fifo so that it can start a transaction in the same TxOP. This 3661 * basically allows the firmware to send bursts. 3662 */ 3663 if (iwl_mvm_vif_low_latency(mvmvif)) 3664 lq_cmd->agg_frame_cnt_limit--; 3665 3666 if (mvmsta->vif->p2p) 3667 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; 3668 3669 lq_cmd->agg_time_limit = 3670 cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta)); 3671 } 3672 3673 static void *rs_alloc(struct ieee80211_hw *hw) 3674 { 3675 return hw->priv; 3676 } 3677 3678 /* rate scale requires free function to be implemented */ 3679 static void rs_free(void *mvm_rate) 3680 { 3681 return; 3682 } 3683 3684 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta) 3685 { 3686 struct iwl_op_mode *op_mode __maybe_unused = mvm_r; 3687 struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode); 3688 3689 IWL_DEBUG_RATE(mvm, "enter\n"); 3690 IWL_DEBUG_RATE(mvm, "leave\n"); 3691 } 3692 3693 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate) 3694 { 3695 3696 char *type, *bw; 3697 u8 mcs = 0, nss = 0; 3698 u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS; 3699 3700 if (!(rate & RATE_MCS_HT_MSK) && 3701 !(rate & RATE_MCS_VHT_MSK) && 3702 !(rate & RATE_MCS_HE_MSK)) { 3703 int index = iwl_hwrate_to_plcp_idx(rate); 3704 3705 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps", 3706 rs_pretty_ant(ant), 3707 index == IWL_RATE_INVALID ? "BAD" : 3708 iwl_rate_mcs[index].mbps); 3709 } 3710 3711 if (rate & RATE_MCS_VHT_MSK) { 3712 type = "VHT"; 3713 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3714 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3715 >> RATE_VHT_MCS_NSS_POS) + 1; 3716 } else if (rate & RATE_MCS_HT_MSK) { 3717 type = "HT"; 3718 mcs = rate & RATE_HT_MCS_INDEX_MSK; 3719 nss = ((rate & RATE_HT_MCS_NSS_MSK) 3720 >> RATE_HT_MCS_NSS_POS) + 1; 3721 } else if (rate & RATE_MCS_HE_MSK) { 3722 type = "HE"; 3723 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK; 3724 nss = ((rate & RATE_VHT_MCS_NSS_MSK) 3725 >> RATE_VHT_MCS_NSS_POS) + 1; 3726 } else { 3727 type = "Unknown"; /* shouldn't happen */ 3728 } 3729 3730 switch (rate & RATE_MCS_CHAN_WIDTH_MSK) { 3731 case RATE_MCS_CHAN_WIDTH_20: 3732 bw = "20Mhz"; 3733 break; 3734 case RATE_MCS_CHAN_WIDTH_40: 3735 bw = "40Mhz"; 3736 break; 3737 case RATE_MCS_CHAN_WIDTH_80: 3738 bw = "80Mhz"; 3739 break; 3740 case RATE_MCS_CHAN_WIDTH_160: 3741 bw = "160Mhz"; 3742 break; 3743 default: 3744 bw = "BAD BW"; 3745 } 3746 3747 return scnprintf(buf, bufsz, 3748 "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s", 3749 rate, type, rs_pretty_ant(ant), bw, mcs, nss, 3750 (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ", 3751 (rate & RATE_MCS_STBC_MSK) ? "STBC " : "", 3752 (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "", 3753 (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "", 3754 (rate & RATE_MCS_BF_MSK) ? "BF " : ""); 3755 } 3756 3757 #ifdef CONFIG_MAC80211_DEBUGFS 3758 /* 3759 * Program the device to use fixed rate for frame transmit 3760 * This is for debugging/testing only 3761 * once the device start use fixed rate, we need to reload the module 3762 * to being back the normal operation. 3763 */ 3764 static void rs_program_fix_rate(struct iwl_mvm *mvm, 3765 struct iwl_lq_sta *lq_sta) 3766 { 3767 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */ 3768 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3769 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */ 3770 3771 IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n", 3772 lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate); 3773 3774 if (lq_sta->pers.dbg_fixed_rate) { 3775 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL); 3776 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq); 3777 } 3778 } 3779 3780 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file, 3781 const char __user *user_buf, size_t count, loff_t *ppos) 3782 { 3783 struct iwl_lq_sta *lq_sta = file->private_data; 3784 struct iwl_mvm *mvm; 3785 char buf[64]; 3786 size_t buf_size; 3787 u32 parsed_rate; 3788 3789 mvm = lq_sta->pers.drv; 3790 memset(buf, 0, sizeof(buf)); 3791 buf_size = min(count, sizeof(buf) - 1); 3792 if (copy_from_user(buf, user_buf, buf_size)) 3793 return -EFAULT; 3794 3795 if (sscanf(buf, "%x", &parsed_rate) == 1) 3796 lq_sta->pers.dbg_fixed_rate = parsed_rate; 3797 else 3798 lq_sta->pers.dbg_fixed_rate = 0; 3799 3800 rs_program_fix_rate(mvm, lq_sta); 3801 3802 return count; 3803 } 3804 3805 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 3806 char __user *user_buf, size_t count, loff_t *ppos) 3807 { 3808 char *buff; 3809 int desc = 0; 3810 int i = 0; 3811 ssize_t ret; 3812 static const size_t bufsz = 2048; 3813 3814 struct iwl_lq_sta *lq_sta = file->private_data; 3815 struct iwl_mvm_sta *mvmsta = 3816 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 3817 struct iwl_mvm *mvm; 3818 struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]); 3819 struct rs_rate *rate = &tbl->rate; 3820 u32 ss_params; 3821 3822 mvm = lq_sta->pers.drv; 3823 buff = kmalloc(bufsz, GFP_KERNEL); 3824 if (!buff) 3825 return -ENOMEM; 3826 3827 desc += scnprintf(buff + desc, bufsz - desc, 3828 "sta_id %d\n", lq_sta->lq.sta_id); 3829 desc += scnprintf(buff + desc, bufsz - desc, 3830 "failed=%d success=%d rate=0%lX\n", 3831 lq_sta->total_failed, lq_sta->total_success, 3832 lq_sta->active_legacy_rate); 3833 desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n", 3834 lq_sta->pers.dbg_fixed_rate); 3835 desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n", 3836 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "", 3837 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "", 3838 (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : ""); 3839 desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n", 3840 (is_legacy(rate)) ? "legacy" : 3841 is_vht(rate) ? "VHT" : "HT"); 3842 if (!is_legacy(rate)) { 3843 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3844 (is_siso(rate)) ? "SISO" : "MIMO2"); 3845 desc += scnprintf(buff + desc, bufsz - desc, " %s", 3846 (is_ht20(rate)) ? "20MHz" : 3847 (is_ht40(rate)) ? "40MHz" : 3848 (is_ht80(rate)) ? "80MHz" : 3849 (is_ht160(rate)) ? "160MHz" : "BAD BW"); 3850 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n", 3851 (rate->sgi) ? "SGI" : "NGI", 3852 (rate->ldpc) ? "LDPC" : "BCC", 3853 (lq_sta->is_agg) ? "AGG on" : "", 3854 (mvmsta->amsdu_enabled) ? "AMSDU on" : ""); 3855 } 3856 desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n", 3857 lq_sta->last_rate_n_flags); 3858 desc += scnprintf(buff + desc, bufsz - desc, 3859 "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n", 3860 lq_sta->lq.flags, 3861 lq_sta->lq.mimo_delim, 3862 lq_sta->lq.single_stream_ant_msk, 3863 lq_sta->lq.dual_stream_ant_msk); 3864 3865 desc += scnprintf(buff + desc, bufsz - desc, 3866 "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n", 3867 le16_to_cpu(lq_sta->lq.agg_time_limit), 3868 lq_sta->lq.agg_disable_start_th, 3869 lq_sta->lq.agg_frame_cnt_limit); 3870 3871 desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n", 3872 lq_sta->lq.reduced_tpc); 3873 ss_params = le32_to_cpu(lq_sta->lq.ss_params); 3874 desc += scnprintf(buff + desc, bufsz - desc, 3875 "single stream params: %s%s%s%s\n", 3876 (ss_params & LQ_SS_PARAMS_VALID) ? 3877 "VALID" : "INVALID", 3878 (ss_params & LQ_SS_BFER_ALLOWED) ? 3879 ", BFER" : "", 3880 (ss_params & LQ_SS_STBC_1SS_ALLOWED) ? 3881 ", STBC" : "", 3882 (ss_params & LQ_SS_FORCE) ? 3883 ", FORCE" : ""); 3884 desc += scnprintf(buff + desc, bufsz - desc, 3885 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n", 3886 lq_sta->lq.initial_rate_index[0], 3887 lq_sta->lq.initial_rate_index[1], 3888 lq_sta->lq.initial_rate_index[2], 3889 lq_sta->lq.initial_rate_index[3]); 3890 3891 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) { 3892 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]); 3893 3894 desc += scnprintf(buff + desc, bufsz - desc, 3895 " rate[%d] 0x%X ", i, r); 3896 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r); 3897 if (desc < bufsz - 1) 3898 buff[desc++] = '\n'; 3899 } 3900 3901 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3902 kfree(buff); 3903 return ret; 3904 } 3905 3906 static const struct file_operations rs_sta_dbgfs_scale_table_ops = { 3907 .write = rs_sta_dbgfs_scale_table_write, 3908 .read = rs_sta_dbgfs_scale_table_read, 3909 .open = simple_open, 3910 .llseek = default_llseek, 3911 }; 3912 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file, 3913 char __user *user_buf, size_t count, loff_t *ppos) 3914 { 3915 char *buff; 3916 int desc = 0; 3917 int i, j; 3918 ssize_t ret; 3919 struct iwl_scale_tbl_info *tbl; 3920 struct rs_rate *rate; 3921 struct iwl_lq_sta *lq_sta = file->private_data; 3922 3923 buff = kmalloc(1024, GFP_KERNEL); 3924 if (!buff) 3925 return -ENOMEM; 3926 3927 for (i = 0; i < LQ_SIZE; i++) { 3928 tbl = &(lq_sta->lq_info[i]); 3929 rate = &tbl->rate; 3930 desc += sprintf(buff+desc, 3931 "%s type=%d SGI=%d BW=%s DUP=0\n" 3932 "index=%d\n", 3933 lq_sta->active_tbl == i ? "*" : "x", 3934 rate->type, 3935 rate->sgi, 3936 is_ht20(rate) ? "20MHz" : 3937 is_ht40(rate) ? "40MHz" : 3938 is_ht80(rate) ? "80MHz" : 3939 is_ht160(rate) ? "160MHz" : "ERR", 3940 rate->index); 3941 for (j = 0; j < IWL_RATE_COUNT; j++) { 3942 desc += sprintf(buff+desc, 3943 "counter=%d success=%d %%=%d\n", 3944 tbl->win[j].counter, 3945 tbl->win[j].success_counter, 3946 tbl->win[j].success_ratio); 3947 } 3948 } 3949 ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); 3950 kfree(buff); 3951 return ret; 3952 } 3953 3954 static const struct file_operations rs_sta_dbgfs_stats_table_ops = { 3955 .read = rs_sta_dbgfs_stats_table_read, 3956 .open = simple_open, 3957 .llseek = default_llseek, 3958 }; 3959 3960 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file, 3961 char __user *user_buf, 3962 size_t count, loff_t *ppos) 3963 { 3964 static const char * const column_name[] = { 3965 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A", 3966 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B", 3967 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A", 3968 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B", 3969 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI", 3970 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI", 3971 [RS_COLUMN_MIMO2] = "MIMO2", 3972 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI", 3973 }; 3974 3975 static const char * const rate_name[] = { 3976 [IWL_RATE_1M_INDEX] = "1M", 3977 [IWL_RATE_2M_INDEX] = "2M", 3978 [IWL_RATE_5M_INDEX] = "5.5M", 3979 [IWL_RATE_11M_INDEX] = "11M", 3980 [IWL_RATE_6M_INDEX] = "6M|MCS0", 3981 [IWL_RATE_9M_INDEX] = "9M", 3982 [IWL_RATE_12M_INDEX] = "12M|MCS1", 3983 [IWL_RATE_18M_INDEX] = "18M|MCS2", 3984 [IWL_RATE_24M_INDEX] = "24M|MCS3", 3985 [IWL_RATE_36M_INDEX] = "36M|MCS4", 3986 [IWL_RATE_48M_INDEX] = "48M|MCS5", 3987 [IWL_RATE_54M_INDEX] = "54M|MCS6", 3988 [IWL_RATE_MCS_7_INDEX] = "MCS7", 3989 [IWL_RATE_MCS_8_INDEX] = "MCS8", 3990 [IWL_RATE_MCS_9_INDEX] = "MCS9", 3991 [IWL_RATE_MCS_10_INDEX] = "MCS10", 3992 [IWL_RATE_MCS_11_INDEX] = "MCS11", 3993 }; 3994 3995 char *buff, *pos, *endpos; 3996 int col, rate; 3997 ssize_t ret; 3998 struct iwl_lq_sta *lq_sta = file->private_data; 3999 struct rs_rate_stats *stats; 4000 static const size_t bufsz = 1024; 4001 4002 buff = kmalloc(bufsz, GFP_KERNEL); 4003 if (!buff) 4004 return -ENOMEM; 4005 4006 pos = buff; 4007 endpos = pos + bufsz; 4008 4009 pos += scnprintf(pos, endpos - pos, "COLUMN,"); 4010 for (rate = 0; rate < IWL_RATE_COUNT; rate++) 4011 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]); 4012 pos += scnprintf(pos, endpos - pos, "\n"); 4013 4014 for (col = 0; col < RS_COLUMN_COUNT; col++) { 4015 pos += scnprintf(pos, endpos - pos, 4016 "%s,", column_name[col]); 4017 4018 for (rate = 0; rate < IWL_RATE_COUNT; rate++) { 4019 stats = &(lq_sta->pers.tx_stats[col][rate]); 4020 pos += scnprintf(pos, endpos - pos, 4021 "%llu/%llu,", 4022 stats->success, 4023 stats->total); 4024 } 4025 pos += scnprintf(pos, endpos - pos, "\n"); 4026 } 4027 4028 ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff); 4029 kfree(buff); 4030 return ret; 4031 } 4032 4033 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file, 4034 const char __user *user_buf, 4035 size_t count, loff_t *ppos) 4036 { 4037 struct iwl_lq_sta *lq_sta = file->private_data; 4038 memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats)); 4039 4040 return count; 4041 } 4042 4043 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = { 4044 .read = rs_sta_dbgfs_drv_tx_stats_read, 4045 .write = rs_sta_dbgfs_drv_tx_stats_write, 4046 .open = simple_open, 4047 .llseek = default_llseek, 4048 }; 4049 4050 static ssize_t iwl_dbgfs_ss_force_read(struct file *file, 4051 char __user *user_buf, 4052 size_t count, loff_t *ppos) 4053 { 4054 struct iwl_lq_sta *lq_sta = file->private_data; 4055 char buf[12]; 4056 int bufsz = sizeof(buf); 4057 int pos = 0; 4058 static const char * const ss_force_name[] = { 4059 [RS_SS_FORCE_NONE] = "none", 4060 [RS_SS_FORCE_STBC] = "stbc", 4061 [RS_SS_FORCE_BFER] = "bfer", 4062 [RS_SS_FORCE_SISO] = "siso", 4063 }; 4064 4065 pos += scnprintf(buf+pos, bufsz-pos, "%s\n", 4066 ss_force_name[lq_sta->pers.ss_force]); 4067 return simple_read_from_buffer(user_buf, count, ppos, buf, pos); 4068 } 4069 4070 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf, 4071 size_t count, loff_t *ppos) 4072 { 4073 struct iwl_mvm *mvm = lq_sta->pers.drv; 4074 int ret = 0; 4075 4076 if (!strncmp("none", buf, 4)) { 4077 lq_sta->pers.ss_force = RS_SS_FORCE_NONE; 4078 } else if (!strncmp("siso", buf, 4)) { 4079 lq_sta->pers.ss_force = RS_SS_FORCE_SISO; 4080 } else if (!strncmp("stbc", buf, 4)) { 4081 if (lq_sta->stbc_capable) { 4082 lq_sta->pers.ss_force = RS_SS_FORCE_STBC; 4083 } else { 4084 IWL_ERR(mvm, 4085 "can't force STBC. peer doesn't support\n"); 4086 ret = -EINVAL; 4087 } 4088 } else if (!strncmp("bfer", buf, 4)) { 4089 if (lq_sta->bfer_capable) { 4090 lq_sta->pers.ss_force = RS_SS_FORCE_BFER; 4091 } else { 4092 IWL_ERR(mvm, 4093 "can't force BFER. peer doesn't support\n"); 4094 ret = -EINVAL; 4095 } 4096 } else { 4097 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n"); 4098 ret = -EINVAL; 4099 } 4100 return ret ?: count; 4101 } 4102 4103 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \ 4104 _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta) 4105 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \ 4106 debugfs_create_file(#name, mode, parent, lq_sta, \ 4107 &iwl_dbgfs_##name##_ops); \ 4108 } while (0) 4109 4110 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32); 4111 4112 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta, 4113 struct dentry *dir) 4114 { 4115 struct iwl_lq_sta *lq_sta = priv_sta; 4116 struct iwl_mvm_sta *mvmsta; 4117 4118 mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv); 4119 4120 if (!mvmsta->vif) 4121 return; 4122 4123 debugfs_create_file("rate_scale_table", 0600, dir, 4124 lq_sta, &rs_sta_dbgfs_scale_table_ops); 4125 debugfs_create_file("rate_stats_table", 0400, dir, 4126 lq_sta, &rs_sta_dbgfs_stats_table_ops); 4127 debugfs_create_file("drv_tx_stats", 0600, dir, 4128 lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops); 4129 debugfs_create_u8("tx_agg_tid_enable", 0600, dir, 4130 &lq_sta->tx_agg_tid_en); 4131 debugfs_create_u8("reduced_tpc", 0600, dir, 4132 &lq_sta->pers.dbg_fixed_txp_reduction); 4133 4134 MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600); 4135 } 4136 #endif 4137 4138 /* 4139 * Initialization of rate scaling information is done by driver after 4140 * the station is added. Since mac80211 calls this function before a 4141 * station is added we ignore it. 4142 */ 4143 static void rs_rate_init_ops(void *mvm_r, 4144 struct ieee80211_supported_band *sband, 4145 struct cfg80211_chan_def *chandef, 4146 struct ieee80211_sta *sta, void *mvm_sta) 4147 { 4148 } 4149 4150 /* ops for rate scaling implemented in the driver */ 4151 static const struct rate_control_ops rs_mvm_ops_drv = { 4152 .name = RS_NAME, 4153 .tx_status = rs_drv_mac80211_tx_status, 4154 .get_rate = rs_drv_get_rate, 4155 .rate_init = rs_rate_init_ops, 4156 .alloc = rs_alloc, 4157 .free = rs_free, 4158 .alloc_sta = rs_drv_alloc_sta, 4159 .free_sta = rs_free_sta, 4160 .rate_update = rs_drv_rate_update, 4161 #ifdef CONFIG_MAC80211_DEBUGFS 4162 .add_sta_debugfs = rs_drv_add_sta_debugfs, 4163 #endif 4164 .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW, 4165 }; 4166 4167 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta, 4168 enum nl80211_band band, bool update) 4169 { 4170 if (iwl_mvm_has_tlc_offload(mvm)) { 4171 rs_fw_rate_init(mvm, sta, band, update); 4172 } else { 4173 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 4174 4175 spin_lock(&mvmsta->lq_sta.rs_drv.pers.lock); 4176 rs_drv_rate_init(mvm, sta, band); 4177 spin_unlock(&mvmsta->lq_sta.rs_drv.pers.lock); 4178 } 4179 } 4180 4181 int iwl_mvm_rate_control_register(void) 4182 { 4183 return ieee80211_rate_control_register(&rs_mvm_ops_drv); 4184 } 4185 4186 void iwl_mvm_rate_control_unregister(void) 4187 { 4188 ieee80211_rate_control_unregister(&rs_mvm_ops_drv); 4189 } 4190 4191 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4192 bool enable) 4193 { 4194 struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq; 4195 4196 lockdep_assert_held(&mvm->mutex); 4197 4198 if (enable) { 4199 if (mvmsta->tx_protection == 0) 4200 lq->flags |= LQ_FLAG_USE_RTS_MSK; 4201 mvmsta->tx_protection++; 4202 } else { 4203 mvmsta->tx_protection--; 4204 if (mvmsta->tx_protection == 0) 4205 lq->flags &= ~LQ_FLAG_USE_RTS_MSK; 4206 } 4207 4208 return iwl_mvm_send_lq_cmd(mvm, lq); 4209 } 4210 4211 /** 4212 * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection 4213 * @mvm: The mvm component 4214 * @mvmsta: The station 4215 * @enable: Enable Tx protection? 4216 */ 4217 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta, 4218 bool enable) 4219 { 4220 if (iwl_mvm_has_tlc_offload(mvm)) 4221 return rs_fw_tx_protection(mvm, mvmsta, enable); 4222 else 4223 return rs_drv_tx_protection(mvm, mvmsta, enable); 4224 } 4225