1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2017 Intel Deutschland GmbH 7 * Copyright (C) 2022 Intel Corporation 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/rtnetlink.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include "rate.h" 15 #include "ieee80211_i.h" 16 #include "debugfs.h" 17 18 struct rate_control_alg { 19 struct list_head list; 20 const struct rate_control_ops *ops; 21 }; 22 23 static LIST_HEAD(rate_ctrl_algs); 24 static DEFINE_MUTEX(rate_ctrl_mutex); 25 26 static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; 27 module_param(ieee80211_default_rc_algo, charp, 0644); 28 MODULE_PARM_DESC(ieee80211_default_rc_algo, 29 "Default rate control algorithm for mac80211 to use"); 30 31 void rate_control_rate_init(struct sta_info *sta) 32 { 33 struct ieee80211_local *local = sta->sdata->local; 34 struct rate_control_ref *ref = sta->rate_ctrl; 35 struct ieee80211_sta *ista = &sta->sta; 36 void *priv_sta = sta->rate_ctrl_priv; 37 struct ieee80211_supported_band *sband; 38 struct ieee80211_chanctx_conf *chanctx_conf; 39 40 ieee80211_sta_set_rx_nss(sta); 41 42 if (!ref) 43 return; 44 45 rcu_read_lock(); 46 47 chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); 48 if (WARN_ON(!chanctx_conf)) { 49 rcu_read_unlock(); 50 return; 51 } 52 53 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; 54 55 /* TODO: check for minstrel_s1g ? */ 56 if (sband->band == NL80211_BAND_S1GHZ) { 57 ieee80211_s1g_sta_rate_init(sta); 58 rcu_read_unlock(); 59 return; 60 } 61 62 spin_lock_bh(&sta->rate_ctrl_lock); 63 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, 64 priv_sta); 65 spin_unlock_bh(&sta->rate_ctrl_lock); 66 rcu_read_unlock(); 67 set_sta_flag(sta, WLAN_STA_RATE_CONTROL); 68 } 69 70 void rate_control_tx_status(struct ieee80211_local *local, 71 struct ieee80211_supported_band *sband, 72 struct ieee80211_tx_status *st) 73 { 74 struct rate_control_ref *ref = local->rate_ctrl; 75 struct sta_info *sta = container_of(st->sta, struct sta_info, sta); 76 void *priv_sta = sta->rate_ctrl_priv; 77 78 if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) 79 return; 80 81 spin_lock_bh(&sta->rate_ctrl_lock); 82 if (ref->ops->tx_status_ext) 83 ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st); 84 else if (st->skb) 85 ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb); 86 else 87 WARN_ON_ONCE(1); 88 89 spin_unlock_bh(&sta->rate_ctrl_lock); 90 } 91 92 void rate_control_rate_update(struct ieee80211_local *local, 93 struct ieee80211_supported_band *sband, 94 struct sta_info *sta, u32 changed) 95 { 96 struct rate_control_ref *ref = local->rate_ctrl; 97 struct ieee80211_sta *ista = &sta->sta; 98 void *priv_sta = sta->rate_ctrl_priv; 99 struct ieee80211_chanctx_conf *chanctx_conf; 100 101 if (ref && ref->ops->rate_update) { 102 rcu_read_lock(); 103 104 chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); 105 if (WARN_ON(!chanctx_conf)) { 106 rcu_read_unlock(); 107 return; 108 } 109 110 spin_lock_bh(&sta->rate_ctrl_lock); 111 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, 112 ista, priv_sta, changed); 113 spin_unlock_bh(&sta->rate_ctrl_lock); 114 rcu_read_unlock(); 115 } 116 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed); 117 } 118 119 int ieee80211_rate_control_register(const struct rate_control_ops *ops) 120 { 121 struct rate_control_alg *alg; 122 123 if (!ops->name) 124 return -EINVAL; 125 126 mutex_lock(&rate_ctrl_mutex); 127 list_for_each_entry(alg, &rate_ctrl_algs, list) { 128 if (!strcmp(alg->ops->name, ops->name)) { 129 /* don't register an algorithm twice */ 130 WARN_ON(1); 131 mutex_unlock(&rate_ctrl_mutex); 132 return -EALREADY; 133 } 134 } 135 136 alg = kzalloc(sizeof(*alg), GFP_KERNEL); 137 if (alg == NULL) { 138 mutex_unlock(&rate_ctrl_mutex); 139 return -ENOMEM; 140 } 141 alg->ops = ops; 142 143 list_add_tail(&alg->list, &rate_ctrl_algs); 144 mutex_unlock(&rate_ctrl_mutex); 145 146 return 0; 147 } 148 EXPORT_SYMBOL(ieee80211_rate_control_register); 149 150 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) 151 { 152 struct rate_control_alg *alg; 153 154 mutex_lock(&rate_ctrl_mutex); 155 list_for_each_entry(alg, &rate_ctrl_algs, list) { 156 if (alg->ops == ops) { 157 list_del(&alg->list); 158 kfree(alg); 159 break; 160 } 161 } 162 mutex_unlock(&rate_ctrl_mutex); 163 } 164 EXPORT_SYMBOL(ieee80211_rate_control_unregister); 165 166 static const struct rate_control_ops * 167 ieee80211_try_rate_control_ops_get(const char *name) 168 { 169 struct rate_control_alg *alg; 170 const struct rate_control_ops *ops = NULL; 171 172 if (!name) 173 return NULL; 174 175 mutex_lock(&rate_ctrl_mutex); 176 list_for_each_entry(alg, &rate_ctrl_algs, list) { 177 if (!strcmp(alg->ops->name, name)) { 178 ops = alg->ops; 179 break; 180 } 181 } 182 mutex_unlock(&rate_ctrl_mutex); 183 return ops; 184 } 185 186 /* Get the rate control algorithm. */ 187 static const struct rate_control_ops * 188 ieee80211_rate_control_ops_get(const char *name) 189 { 190 const struct rate_control_ops *ops; 191 const char *alg_name; 192 193 kernel_param_lock(THIS_MODULE); 194 if (!name) 195 alg_name = ieee80211_default_rc_algo; 196 else 197 alg_name = name; 198 199 ops = ieee80211_try_rate_control_ops_get(alg_name); 200 if (!ops && name) 201 /* try default if specific alg requested but not found */ 202 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); 203 204 /* Note: check for > 0 is intentional to avoid clang warning */ 205 if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0)) 206 /* try built-in one if specific alg requested but not found */ 207 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); 208 209 kernel_param_unlock(THIS_MODULE); 210 211 return ops; 212 } 213 214 #ifdef CONFIG_MAC80211_DEBUGFS 215 static ssize_t rcname_read(struct file *file, char __user *userbuf, 216 size_t count, loff_t *ppos) 217 { 218 struct rate_control_ref *ref = file->private_data; 219 int len = strlen(ref->ops->name); 220 221 return simple_read_from_buffer(userbuf, count, ppos, 222 ref->ops->name, len); 223 } 224 225 const struct file_operations rcname_ops = { 226 .read = rcname_read, 227 .open = simple_open, 228 .llseek = default_llseek, 229 }; 230 #endif 231 232 static struct rate_control_ref * 233 rate_control_alloc(const char *name, struct ieee80211_local *local) 234 { 235 struct rate_control_ref *ref; 236 237 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); 238 if (!ref) 239 return NULL; 240 ref->ops = ieee80211_rate_control_ops_get(name); 241 if (!ref->ops) 242 goto free; 243 244 ref->priv = ref->ops->alloc(&local->hw); 245 if (!ref->priv) 246 goto free; 247 return ref; 248 249 free: 250 kfree(ref); 251 return NULL; 252 } 253 254 static void rate_control_free(struct ieee80211_local *local, 255 struct rate_control_ref *ctrl_ref) 256 { 257 ctrl_ref->ops->free(ctrl_ref->priv); 258 259 #ifdef CONFIG_MAC80211_DEBUGFS 260 debugfs_remove_recursive(local->debugfs.rcdir); 261 local->debugfs.rcdir = NULL; 262 #endif 263 264 kfree(ctrl_ref); 265 } 266 267 void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata) 268 { 269 struct ieee80211_local *local = sdata->local; 270 struct ieee80211_supported_band *sband; 271 u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates; 272 enum nl80211_band band; 273 274 if (WARN_ON(!sdata->vif.bss_conf.chandef.chan)) 275 return; 276 277 band = sdata->vif.bss_conf.chandef.chan->band; 278 if (band == NL80211_BAND_S1GHZ) { 279 /* TODO */ 280 return; 281 } 282 283 if (WARN_ON_ONCE(!basic_rates)) 284 return; 285 286 user_mask = sdata->rc_rateidx_mask[band]; 287 sband = local->hw.wiphy->bands[band]; 288 289 if (user_mask & basic_rates) 290 return; 291 292 sdata_dbg(sdata, 293 "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter", 294 basic_rates, user_mask, band); 295 sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1; 296 } 297 298 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) 299 { 300 struct sk_buff *skb = txrc->skb; 301 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 302 303 return (info->flags & (IEEE80211_TX_CTL_NO_ACK | 304 IEEE80211_TX_CTL_USE_MINRATE)) || 305 !ieee80211_is_tx_data(skb); 306 } 307 308 static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate, 309 u32 basic_rates, 310 struct ieee80211_supported_band *sband) 311 { 312 u8 i; 313 314 if (sband->band == NL80211_BAND_S1GHZ) { 315 /* TODO */ 316 rate->flags |= IEEE80211_TX_RC_S1G_MCS; 317 rate->idx = 0; 318 return; 319 } 320 321 if (basic_rates == 0) 322 return; /* assume basic rates unknown and accept rate */ 323 if (rate->idx < 0) 324 return; 325 if (basic_rates & (1 << rate->idx)) 326 return; /* selected rate is a basic rate */ 327 328 for (i = rate->idx + 1; i <= sband->n_bitrates; i++) { 329 if (basic_rates & (1 << i)) { 330 rate->idx = i; 331 return; 332 } 333 } 334 335 /* could not find a basic rate; use original selection */ 336 } 337 338 static void __rate_control_send_low(struct ieee80211_hw *hw, 339 struct ieee80211_supported_band *sband, 340 struct ieee80211_sta *sta, 341 struct ieee80211_tx_info *info, 342 u32 rate_mask) 343 { 344 int i; 345 u32 rate_flags = 346 ieee80211_chandef_rate_flags(&hw->conf.chandef); 347 348 if (sband->band == NL80211_BAND_S1GHZ) { 349 info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS; 350 info->control.rates[0].idx = 0; 351 return; 352 } 353 354 if ((sband->band == NL80211_BAND_2GHZ) && 355 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) 356 rate_flags |= IEEE80211_RATE_ERP_G; 357 358 info->control.rates[0].idx = 0; 359 for (i = 0; i < sband->n_bitrates; i++) { 360 if (!(rate_mask & BIT(i))) 361 continue; 362 363 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 364 continue; 365 366 if (!rate_supported(sta, sband->band, i)) 367 continue; 368 369 info->control.rates[0].idx = i; 370 break; 371 } 372 WARN_ONCE(i == sband->n_bitrates, 373 "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n", 374 sta ? sta->addr : NULL, 375 sta ? sta->deflink.supp_rates[sband->band] : -1, 376 sband->band, 377 rate_mask, rate_flags); 378 379 info->control.rates[0].count = 380 (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 381 1 : hw->max_rate_tries; 382 383 info->control.skip_table = 1; 384 } 385 386 387 static bool rate_control_send_low(struct ieee80211_sta *pubsta, 388 struct ieee80211_tx_rate_control *txrc) 389 { 390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 391 struct ieee80211_supported_band *sband = txrc->sband; 392 struct sta_info *sta; 393 int mcast_rate; 394 bool use_basicrate = false; 395 396 if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) { 397 __rate_control_send_low(txrc->hw, sband, pubsta, info, 398 txrc->rate_idx_mask); 399 400 if (!pubsta && txrc->bss) { 401 mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; 402 if (mcast_rate > 0) { 403 info->control.rates[0].idx = mcast_rate - 1; 404 return true; 405 } 406 use_basicrate = true; 407 } else if (pubsta) { 408 sta = container_of(pubsta, struct sta_info, sta); 409 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 410 use_basicrate = true; 411 } 412 413 if (use_basicrate) 414 rc_send_low_basicrate(&info->control.rates[0], 415 txrc->bss_conf->basic_rates, 416 sband); 417 418 return true; 419 } 420 return false; 421 } 422 423 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) 424 { 425 int j; 426 427 /* See whether the selected rate or anything below it is allowed. */ 428 for (j = *rate_idx; j >= 0; j--) { 429 if (mask & (1 << j)) { 430 /* Okay, found a suitable rate. Use it. */ 431 *rate_idx = j; 432 return true; 433 } 434 } 435 436 /* Try to find a higher rate that would be allowed */ 437 for (j = *rate_idx + 1; j < n_bitrates; j++) { 438 if (mask & (1 << j)) { 439 /* Okay, found a suitable rate. Use it. */ 440 *rate_idx = j; 441 return true; 442 } 443 } 444 return false; 445 } 446 447 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) 448 { 449 int i, j; 450 int ridx, rbit; 451 452 ridx = *rate_idx / 8; 453 rbit = *rate_idx % 8; 454 455 /* sanity check */ 456 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) 457 return false; 458 459 /* See whether the selected rate or anything below it is allowed. */ 460 for (i = ridx; i >= 0; i--) { 461 for (j = rbit; j >= 0; j--) 462 if (mcs_mask[i] & BIT(j)) { 463 *rate_idx = i * 8 + j; 464 return true; 465 } 466 rbit = 7; 467 } 468 469 /* Try to find a higher rate that would be allowed */ 470 ridx = (*rate_idx + 1) / 8; 471 rbit = (*rate_idx + 1) % 8; 472 473 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 474 for (j = rbit; j < 8; j++) 475 if (mcs_mask[i] & BIT(j)) { 476 *rate_idx = i * 8 + j; 477 return true; 478 } 479 rbit = 0; 480 } 481 return false; 482 } 483 484 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) 485 { 486 int i, j; 487 int ridx, rbit; 488 489 ridx = *rate_idx >> 4; 490 rbit = *rate_idx & 0xf; 491 492 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) 493 return false; 494 495 /* See whether the selected rate or anything below it is allowed. */ 496 for (i = ridx; i >= 0; i--) { 497 for (j = rbit; j >= 0; j--) { 498 if (vht_mask[i] & BIT(j)) { 499 *rate_idx = (i << 4) | j; 500 return true; 501 } 502 } 503 rbit = 15; 504 } 505 506 /* Try to find a higher rate that would be allowed */ 507 ridx = (*rate_idx + 1) >> 4; 508 rbit = (*rate_idx + 1) & 0xf; 509 510 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { 511 for (j = rbit; j < 16; j++) { 512 if (vht_mask[i] & BIT(j)) { 513 *rate_idx = (i << 4) | j; 514 return true; 515 } 516 } 517 rbit = 0; 518 } 519 return false; 520 } 521 522 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, 523 struct ieee80211_supported_band *sband, 524 enum nl80211_chan_width chan_width, 525 u32 mask, 526 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 527 u16 vht_mask[NL80211_VHT_NSS_MAX]) 528 { 529 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { 530 /* handle VHT rates */ 531 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) 532 return; 533 534 *rate_idx = 0; 535 /* keep protection flags */ 536 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 537 IEEE80211_TX_RC_USE_CTS_PROTECT | 538 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 539 540 *rate_flags |= IEEE80211_TX_RC_MCS; 541 if (chan_width == NL80211_CHAN_WIDTH_40) 542 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 543 544 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 545 return; 546 547 /* also try the legacy rates. */ 548 *rate_flags &= ~(IEEE80211_TX_RC_MCS | 549 IEEE80211_TX_RC_40_MHZ_WIDTH); 550 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 551 mask)) 552 return; 553 } else if (*rate_flags & IEEE80211_TX_RC_MCS) { 554 /* handle HT rates */ 555 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 556 return; 557 558 /* also try the legacy rates. */ 559 *rate_idx = 0; 560 /* keep protection flags */ 561 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 562 IEEE80211_TX_RC_USE_CTS_PROTECT | 563 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 564 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 565 mask)) 566 return; 567 } else { 568 /* handle legacy rates */ 569 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 570 mask)) 571 return; 572 573 /* if HT BSS, and we handle a data frame, also try HT rates */ 574 switch (chan_width) { 575 case NL80211_CHAN_WIDTH_20_NOHT: 576 case NL80211_CHAN_WIDTH_5: 577 case NL80211_CHAN_WIDTH_10: 578 return; 579 default: 580 break; 581 } 582 583 *rate_idx = 0; 584 /* keep protection flags */ 585 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 586 IEEE80211_TX_RC_USE_CTS_PROTECT | 587 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 588 589 *rate_flags |= IEEE80211_TX_RC_MCS; 590 591 if (chan_width == NL80211_CHAN_WIDTH_40) 592 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 593 594 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 595 return; 596 } 597 598 /* 599 * Uh.. No suitable rate exists. This should not really happen with 600 * sane TX rate mask configurations. However, should someone manage to 601 * configure supported rates and TX rate mask in incompatible way, 602 * allow the frame to be transmitted with whatever the rate control 603 * selected. 604 */ 605 } 606 607 static void rate_fixup_ratelist(struct ieee80211_vif *vif, 608 struct ieee80211_supported_band *sband, 609 struct ieee80211_tx_info *info, 610 struct ieee80211_tx_rate *rates, 611 int max_rates) 612 { 613 struct ieee80211_rate *rate; 614 bool inval = false; 615 int i; 616 617 /* 618 * Set up the RTS/CTS rate as the fastest basic rate 619 * that is not faster than the data rate unless there 620 * is no basic rate slower than the data rate, in which 621 * case we pick the slowest basic rate 622 * 623 * XXX: Should this check all retry rates? 624 */ 625 if (!(rates[0].flags & 626 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { 627 u32 basic_rates = vif->bss_conf.basic_rates; 628 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; 629 630 rate = &sband->bitrates[rates[0].idx]; 631 632 for (i = 0; i < sband->n_bitrates; i++) { 633 /* must be a basic rate */ 634 if (!(basic_rates & BIT(i))) 635 continue; 636 /* must not be faster than the data rate */ 637 if (sband->bitrates[i].bitrate > rate->bitrate) 638 continue; 639 /* maximum */ 640 if (sband->bitrates[baserate].bitrate < 641 sband->bitrates[i].bitrate) 642 baserate = i; 643 } 644 645 info->control.rts_cts_rate_idx = baserate; 646 } 647 648 for (i = 0; i < max_rates; i++) { 649 /* 650 * make sure there's no valid rate following 651 * an invalid one, just in case drivers don't 652 * take the API seriously to stop at -1. 653 */ 654 if (inval) { 655 rates[i].idx = -1; 656 continue; 657 } 658 if (rates[i].idx < 0) { 659 inval = true; 660 continue; 661 } 662 663 /* 664 * For now assume MCS is already set up correctly, this 665 * needs to be fixed. 666 */ 667 if (rates[i].flags & IEEE80211_TX_RC_MCS) { 668 WARN_ON(rates[i].idx > 76); 669 670 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 671 info->control.use_cts_prot) 672 rates[i].flags |= 673 IEEE80211_TX_RC_USE_CTS_PROTECT; 674 continue; 675 } 676 677 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { 678 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); 679 continue; 680 } 681 682 /* set up RTS protection if desired */ 683 if (info->control.use_rts) { 684 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; 685 info->control.use_cts_prot = false; 686 } 687 688 /* RC is busted */ 689 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { 690 rates[i].idx = -1; 691 continue; 692 } 693 694 rate = &sband->bitrates[rates[i].idx]; 695 696 /* set up short preamble */ 697 if (info->control.short_preamble && 698 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 699 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 700 701 /* set up G protection */ 702 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 703 info->control.use_cts_prot && 704 rate->flags & IEEE80211_RATE_ERP_G) 705 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; 706 } 707 } 708 709 710 static void rate_control_fill_sta_table(struct ieee80211_sta *sta, 711 struct ieee80211_tx_info *info, 712 struct ieee80211_tx_rate *rates, 713 int max_rates) 714 { 715 struct ieee80211_sta_rates *ratetbl = NULL; 716 int i; 717 718 if (sta && !info->control.skip_table) 719 ratetbl = rcu_dereference(sta->rates); 720 721 /* Fill remaining rate slots with data from the sta rate table. */ 722 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); 723 for (i = 0; i < max_rates; i++) { 724 if (i < ARRAY_SIZE(info->control.rates) && 725 info->control.rates[i].idx >= 0 && 726 info->control.rates[i].count) { 727 if (rates != info->control.rates) 728 rates[i] = info->control.rates[i]; 729 } else if (ratetbl) { 730 rates[i].idx = ratetbl->rate[i].idx; 731 rates[i].flags = ratetbl->rate[i].flags; 732 if (info->control.use_rts) 733 rates[i].count = ratetbl->rate[i].count_rts; 734 else if (info->control.use_cts_prot) 735 rates[i].count = ratetbl->rate[i].count_cts; 736 else 737 rates[i].count = ratetbl->rate[i].count; 738 } else { 739 rates[i].idx = -1; 740 rates[i].count = 0; 741 } 742 743 if (rates[i].idx < 0 || !rates[i].count) 744 break; 745 } 746 } 747 748 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, 749 struct ieee80211_supported_band *sband, 750 struct ieee80211_sta *sta, u32 *mask, 751 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 752 u16 vht_mask[NL80211_VHT_NSS_MAX]) 753 { 754 u32 i, flags; 755 756 *mask = sdata->rc_rateidx_mask[sband->band]; 757 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 758 for (i = 0; i < sband->n_bitrates; i++) { 759 if ((flags & sband->bitrates[i].flags) != flags) 760 *mask &= ~BIT(i); 761 } 762 763 if (*mask == (1 << sband->n_bitrates) - 1 && 764 !sdata->rc_has_mcs_mask[sband->band] && 765 !sdata->rc_has_vht_mcs_mask[sband->band]) 766 return false; 767 768 if (sdata->rc_has_mcs_mask[sband->band]) 769 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], 770 IEEE80211_HT_MCS_MASK_LEN); 771 else 772 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); 773 774 if (sdata->rc_has_vht_mcs_mask[sband->band]) 775 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], 776 sizeof(u16) * NL80211_VHT_NSS_MAX); 777 else 778 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); 779 780 if (sta) { 781 __le16 sta_vht_cap; 782 u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; 783 784 /* Filter out rates that the STA does not support */ 785 *mask &= sta->deflink.supp_rates[sband->band]; 786 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) 787 mcs_mask[i] &= sta->deflink.ht_cap.mcs.rx_mask[i]; 788 789 sta_vht_cap = sta->deflink.vht_cap.vht_mcs.rx_mcs_map; 790 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); 791 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) 792 vht_mask[i] &= sta_vht_mask[i]; 793 } 794 795 return true; 796 } 797 798 static void 799 rate_control_apply_mask_ratetbl(struct sta_info *sta, 800 struct ieee80211_supported_band *sband, 801 struct ieee80211_sta_rates *rates) 802 { 803 int i; 804 u32 mask; 805 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 806 u16 vht_mask[NL80211_VHT_NSS_MAX]; 807 enum nl80211_chan_width chan_width; 808 809 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, 810 mcs_mask, vht_mask)) 811 return; 812 813 chan_width = sta->sdata->vif.bss_conf.chandef.width; 814 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { 815 if (rates->rate[i].idx < 0) 816 break; 817 818 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, 819 sband, chan_width, mask, mcs_mask, 820 vht_mask); 821 } 822 } 823 824 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, 825 struct ieee80211_sta *sta, 826 struct ieee80211_supported_band *sband, 827 struct ieee80211_tx_rate *rates, 828 int max_rates) 829 { 830 enum nl80211_chan_width chan_width; 831 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 832 u32 mask; 833 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; 834 int i; 835 836 /* 837 * Try to enforce the rateidx mask the user wanted. skip this if the 838 * default mask (allow all rates) is used to save some processing for 839 * the common case. 840 */ 841 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, 842 vht_mask)) 843 return; 844 845 /* 846 * Make sure the rate index selected for each TX rate is 847 * included in the configured mask and change the rate indexes 848 * if needed. 849 */ 850 chan_width = sdata->vif.bss_conf.chandef.width; 851 for (i = 0; i < max_rates; i++) { 852 /* Skip invalid rates */ 853 if (rates[i].idx < 0) 854 break; 855 856 rate_flags = rates[i].flags; 857 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, 858 chan_width, mask, mcs_mask, vht_mask); 859 rates[i].flags = rate_flags; 860 } 861 } 862 863 void ieee80211_get_tx_rates(struct ieee80211_vif *vif, 864 struct ieee80211_sta *sta, 865 struct sk_buff *skb, 866 struct ieee80211_tx_rate *dest, 867 int max_rates) 868 { 869 struct ieee80211_sub_if_data *sdata; 870 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 871 struct ieee80211_supported_band *sband; 872 873 rate_control_fill_sta_table(sta, info, dest, max_rates); 874 875 if (!vif) 876 return; 877 878 sdata = vif_to_sdata(vif); 879 sband = sdata->local->hw.wiphy->bands[info->band]; 880 881 if (ieee80211_is_tx_data(skb)) 882 rate_control_apply_mask(sdata, sta, sband, dest, max_rates); 883 884 if (dest[0].idx < 0) 885 __rate_control_send_low(&sdata->local->hw, sband, sta, info, 886 sdata->rc_rateidx_mask[info->band]); 887 888 if (sta) 889 rate_fixup_ratelist(vif, sband, info, dest, max_rates); 890 } 891 EXPORT_SYMBOL(ieee80211_get_tx_rates); 892 893 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, 894 struct sta_info *sta, 895 struct ieee80211_tx_rate_control *txrc) 896 { 897 struct rate_control_ref *ref = sdata->local->rate_ctrl; 898 void *priv_sta = NULL; 899 struct ieee80211_sta *ista = NULL; 900 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 901 int i; 902 903 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 904 info->control.rates[i].idx = -1; 905 info->control.rates[i].flags = 0; 906 info->control.rates[i].count = 0; 907 } 908 909 if (rate_control_send_low(sta ? &sta->sta : NULL, txrc)) 910 return; 911 912 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) 913 return; 914 915 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { 916 ista = &sta->sta; 917 priv_sta = sta->rate_ctrl_priv; 918 } 919 920 if (ista) { 921 spin_lock_bh(&sta->rate_ctrl_lock); 922 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); 923 spin_unlock_bh(&sta->rate_ctrl_lock); 924 } else { 925 rate_control_send_low(NULL, txrc); 926 } 927 928 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) 929 return; 930 931 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, 932 info->control.rates, 933 ARRAY_SIZE(info->control.rates)); 934 } 935 936 int rate_control_set_rates(struct ieee80211_hw *hw, 937 struct ieee80211_sta *pubsta, 938 struct ieee80211_sta_rates *rates) 939 { 940 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 941 struct ieee80211_sta_rates *old; 942 struct ieee80211_supported_band *sband; 943 944 sband = ieee80211_get_sband(sta->sdata); 945 if (!sband) 946 return -EINVAL; 947 rate_control_apply_mask_ratetbl(sta, sband, rates); 948 /* 949 * mac80211 guarantees that this function will not be called 950 * concurrently, so the following RCU access is safe, even without 951 * extra locking. This can not be checked easily, so we just set 952 * the condition to true. 953 */ 954 old = rcu_dereference_protected(pubsta->rates, true); 955 rcu_assign_pointer(pubsta->rates, rates); 956 if (old) 957 kfree_rcu(old, rcu_head); 958 959 if (sta->uploaded) 960 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); 961 962 ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta)); 963 964 return 0; 965 } 966 EXPORT_SYMBOL(rate_control_set_rates); 967 968 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, 969 const char *name) 970 { 971 struct rate_control_ref *ref; 972 973 ASSERT_RTNL(); 974 975 if (local->open_count) 976 return -EBUSY; 977 978 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 979 if (WARN_ON(!local->ops->set_rts_threshold)) 980 return -EINVAL; 981 return 0; 982 } 983 984 ref = rate_control_alloc(name, local); 985 if (!ref) { 986 wiphy_warn(local->hw.wiphy, 987 "Failed to select rate control algorithm\n"); 988 return -ENOENT; 989 } 990 991 WARN_ON(local->rate_ctrl); 992 local->rate_ctrl = ref; 993 994 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", 995 ref->ops->name); 996 997 return 0; 998 } 999 1000 void rate_control_deinitialize(struct ieee80211_local *local) 1001 { 1002 struct rate_control_ref *ref; 1003 1004 ref = local->rate_ctrl; 1005 1006 if (!ref) 1007 return; 1008 1009 local->rate_ctrl = NULL; 1010 rate_control_free(local, ref); 1011 } 1012