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) 2019, 2022-2024 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 link_sta_info *link_sta) 32 { 33 struct sta_info *sta = link_sta->sta; 34 struct ieee80211_local *local = sta->sdata->local; 35 struct rate_control_ref *ref = sta->rate_ctrl; 36 struct ieee80211_sta *ista = &sta->sta; 37 void *priv_sta = sta->rate_ctrl_priv; 38 struct ieee80211_supported_band *sband; 39 struct ieee80211_chanctx_conf *chanctx_conf; 40 41 ieee80211_sta_init_nss(link_sta); 42 43 if (!ref) 44 return; 45 46 /* SW rate control isn't supported with MLO right now */ 47 if (WARN_ON(ieee80211_vif_is_mld(&sta->sdata->vif))) 48 return; 49 50 rcu_read_lock(); 51 52 chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); 53 if (WARN_ON(!chanctx_conf)) { 54 rcu_read_unlock(); 55 return; 56 } 57 58 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; 59 60 /* TODO: check for minstrel_s1g ? */ 61 if (sband->band == NL80211_BAND_S1GHZ) { 62 ieee80211_s1g_sta_rate_init(sta); 63 rcu_read_unlock(); 64 return; 65 } 66 67 spin_lock_bh(&sta->rate_ctrl_lock); 68 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, 69 priv_sta); 70 spin_unlock_bh(&sta->rate_ctrl_lock); 71 rcu_read_unlock(); 72 set_sta_flag(sta, WLAN_STA_RATE_CONTROL); 73 } 74 75 void rate_control_rate_init_all_links(struct sta_info *sta) 76 { 77 int link_id; 78 79 for (link_id = 0; link_id < ARRAY_SIZE(sta->link); link_id++) { 80 struct link_sta_info *link_sta; 81 82 link_sta = sdata_dereference(sta->link[link_id], sta->sdata); 83 if (!link_sta) 84 continue; 85 86 rate_control_rate_init(link_sta); 87 } 88 } 89 90 void rate_control_tx_status(struct ieee80211_local *local, 91 struct ieee80211_tx_status *st) 92 { 93 struct rate_control_ref *ref = local->rate_ctrl; 94 struct sta_info *sta = container_of(st->sta, struct sta_info, sta); 95 void *priv_sta = sta->rate_ctrl_priv; 96 struct ieee80211_supported_band *sband; 97 98 if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) 99 return; 100 101 sband = local->hw.wiphy->bands[st->info->band]; 102 103 spin_lock_bh(&sta->rate_ctrl_lock); 104 if (ref->ops->tx_status_ext) 105 ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st); 106 else if (st->skb) 107 ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb); 108 else 109 WARN_ON_ONCE(1); 110 111 spin_unlock_bh(&sta->rate_ctrl_lock); 112 } 113 114 void rate_control_rate_update(struct ieee80211_local *local, 115 struct ieee80211_supported_band *sband, 116 struct link_sta_info *link_sta, 117 u32 changed) 118 { 119 struct rate_control_ref *ref = local->rate_ctrl; 120 struct sta_info *sta = link_sta->sta; 121 struct ieee80211_sta *ista = &sta->sta; 122 void *priv_sta = sta->rate_ctrl_priv; 123 struct ieee80211_chanctx_conf *chanctx_conf; 124 125 if (ref && ref->ops->rate_update) { 126 rcu_read_lock(); 127 128 chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf); 129 if (WARN_ON(!chanctx_conf)) { 130 rcu_read_unlock(); 131 return; 132 } 133 134 spin_lock_bh(&sta->rate_ctrl_lock); 135 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, 136 ista, priv_sta, changed); 137 spin_unlock_bh(&sta->rate_ctrl_lock); 138 rcu_read_unlock(); 139 } 140 141 if (sta->uploaded) 142 drv_link_sta_rc_update(local, sta->sdata, link_sta->pub, 143 changed); 144 } 145 146 int ieee80211_rate_control_register(const struct rate_control_ops *ops) 147 { 148 struct rate_control_alg *alg; 149 150 if (!ops->name) 151 return -EINVAL; 152 153 mutex_lock(&rate_ctrl_mutex); 154 list_for_each_entry(alg, &rate_ctrl_algs, list) { 155 if (!strcmp(alg->ops->name, ops->name)) { 156 /* don't register an algorithm twice */ 157 WARN_ON(1); 158 mutex_unlock(&rate_ctrl_mutex); 159 return -EALREADY; 160 } 161 } 162 163 alg = kzalloc(sizeof(*alg), GFP_KERNEL); 164 if (alg == NULL) { 165 mutex_unlock(&rate_ctrl_mutex); 166 return -ENOMEM; 167 } 168 alg->ops = ops; 169 170 list_add_tail(&alg->list, &rate_ctrl_algs); 171 mutex_unlock(&rate_ctrl_mutex); 172 173 return 0; 174 } 175 EXPORT_SYMBOL(ieee80211_rate_control_register); 176 177 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) 178 { 179 struct rate_control_alg *alg; 180 181 mutex_lock(&rate_ctrl_mutex); 182 list_for_each_entry(alg, &rate_ctrl_algs, list) { 183 if (alg->ops == ops) { 184 list_del(&alg->list); 185 kfree(alg); 186 break; 187 } 188 } 189 mutex_unlock(&rate_ctrl_mutex); 190 } 191 EXPORT_SYMBOL(ieee80211_rate_control_unregister); 192 193 static const struct rate_control_ops * 194 ieee80211_try_rate_control_ops_get(const char *name) 195 { 196 struct rate_control_alg *alg; 197 const struct rate_control_ops *ops = NULL; 198 199 if (!name) 200 return NULL; 201 202 mutex_lock(&rate_ctrl_mutex); 203 list_for_each_entry(alg, &rate_ctrl_algs, list) { 204 if (!strcmp(alg->ops->name, name)) { 205 ops = alg->ops; 206 break; 207 } 208 } 209 mutex_unlock(&rate_ctrl_mutex); 210 return ops; 211 } 212 213 /* Get the rate control algorithm. */ 214 static const struct rate_control_ops * 215 ieee80211_rate_control_ops_get(const char *name) 216 { 217 const struct rate_control_ops *ops; 218 const char *alg_name; 219 220 kernel_param_lock(THIS_MODULE); 221 if (!name) 222 alg_name = ieee80211_default_rc_algo; 223 else 224 alg_name = name; 225 226 ops = ieee80211_try_rate_control_ops_get(alg_name); 227 if (!ops && name) 228 /* try default if specific alg requested but not found */ 229 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); 230 231 /* Note: check for > 0 is intentional to avoid clang warning */ 232 if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0)) 233 /* try built-in one if specific alg requested but not found */ 234 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); 235 236 kernel_param_unlock(THIS_MODULE); 237 238 return ops; 239 } 240 241 #ifdef CONFIG_MAC80211_DEBUGFS 242 static ssize_t rcname_read(struct file *file, char __user *userbuf, 243 size_t count, loff_t *ppos) 244 { 245 struct rate_control_ref *ref = file->private_data; 246 int len = strlen(ref->ops->name); 247 248 return simple_read_from_buffer(userbuf, count, ppos, 249 ref->ops->name, len); 250 } 251 252 const struct debugfs_short_fops rcname_ops = { 253 .read = rcname_read, 254 .llseek = default_llseek, 255 }; 256 #endif 257 258 static struct rate_control_ref * 259 rate_control_alloc(const char *name, struct ieee80211_local *local) 260 { 261 struct rate_control_ref *ref; 262 263 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); 264 if (!ref) 265 return NULL; 266 ref->ops = ieee80211_rate_control_ops_get(name); 267 if (!ref->ops) 268 goto free; 269 270 ref->priv = ref->ops->alloc(&local->hw); 271 if (!ref->priv) 272 goto free; 273 return ref; 274 275 free: 276 kfree(ref); 277 return NULL; 278 } 279 280 static void rate_control_free(struct ieee80211_local *local, 281 struct rate_control_ref *ctrl_ref) 282 { 283 ctrl_ref->ops->free(ctrl_ref->priv); 284 285 #ifdef CONFIG_MAC80211_DEBUGFS 286 debugfs_remove_recursive(local->debugfs.rcdir); 287 local->debugfs.rcdir = NULL; 288 #endif 289 290 kfree(ctrl_ref); 291 } 292 293 void ieee80211_check_rate_mask(struct ieee80211_link_data *link) 294 { 295 struct ieee80211_sub_if_data *sdata = link->sdata; 296 struct ieee80211_local *local = sdata->local; 297 struct ieee80211_supported_band *sband; 298 u32 user_mask, basic_rates = link->conf->basic_rates; 299 enum nl80211_band band; 300 301 if (WARN_ON(!link->conf->chanreq.oper.chan)) 302 return; 303 304 band = link->conf->chanreq.oper.chan->band; 305 if (band == NL80211_BAND_S1GHZ) { 306 /* TODO */ 307 return; 308 } 309 310 if (WARN_ON_ONCE(!basic_rates)) 311 return; 312 313 user_mask = sdata->rc_rateidx_mask[band]; 314 sband = local->hw.wiphy->bands[band]; 315 316 if (user_mask & basic_rates) 317 return; 318 319 sdata_dbg(sdata, 320 "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter", 321 basic_rates, user_mask, band); 322 sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1; 323 } 324 325 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) 326 { 327 struct sk_buff *skb = txrc->skb; 328 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 329 330 return (info->flags & (IEEE80211_TX_CTL_NO_ACK | 331 IEEE80211_TX_CTL_USE_MINRATE)) || 332 !ieee80211_is_tx_data(skb); 333 } 334 335 static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate, 336 u32 basic_rates, 337 struct ieee80211_supported_band *sband) 338 { 339 u8 i; 340 341 if (sband->band == NL80211_BAND_S1GHZ) { 342 /* TODO */ 343 rate->flags |= IEEE80211_TX_RC_S1G_MCS; 344 rate->idx = 0; 345 return; 346 } 347 348 if (basic_rates == 0) 349 return; /* assume basic rates unknown and accept rate */ 350 if (rate->idx < 0) 351 return; 352 if (basic_rates & (1 << rate->idx)) 353 return; /* selected rate is a basic rate */ 354 355 for (i = rate->idx + 1; i <= sband->n_bitrates; i++) { 356 if (basic_rates & (1 << i)) { 357 rate->idx = i; 358 return; 359 } 360 } 361 362 /* could not find a basic rate; use original selection */ 363 } 364 365 static void __rate_control_send_low(struct ieee80211_hw *hw, 366 struct ieee80211_supported_band *sband, 367 struct ieee80211_sta *sta, 368 struct ieee80211_tx_info *info, 369 u32 rate_mask) 370 { 371 int i; 372 u32 rate_flags = 373 ieee80211_chandef_rate_flags(&hw->conf.chandef); 374 375 if (sband->band == NL80211_BAND_S1GHZ) { 376 info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS; 377 info->control.rates[0].idx = 0; 378 return; 379 } 380 381 if ((sband->band == NL80211_BAND_2GHZ) && 382 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) 383 rate_flags |= IEEE80211_RATE_ERP_G; 384 385 info->control.rates[0].idx = 0; 386 for (i = 0; i < sband->n_bitrates; i++) { 387 if (!(rate_mask & BIT(i))) 388 continue; 389 390 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 391 continue; 392 393 if (!rate_supported(sta, sband->band, i)) 394 continue; 395 396 info->control.rates[0].idx = i; 397 break; 398 } 399 WARN_ONCE(i == sband->n_bitrates, 400 "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n", 401 sta ? sta->addr : NULL, 402 sta ? sta->deflink.supp_rates[sband->band] : -1, 403 sband->band, 404 rate_mask, rate_flags); 405 406 info->control.rates[0].count = 407 (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 408 1 : hw->max_rate_tries; 409 410 info->control.skip_table = 1; 411 } 412 413 414 static bool rate_control_send_low(struct ieee80211_sta *pubsta, 415 struct ieee80211_tx_rate_control *txrc) 416 { 417 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 418 struct ieee80211_supported_band *sband = txrc->sband; 419 struct sta_info *sta; 420 int mcast_rate; 421 bool use_basicrate = false; 422 423 if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) { 424 __rate_control_send_low(txrc->hw, sband, pubsta, info, 425 txrc->rate_idx_mask); 426 427 if (!pubsta && txrc->bss) { 428 mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; 429 if (mcast_rate > 0) { 430 info->control.rates[0].idx = mcast_rate - 1; 431 return true; 432 } 433 use_basicrate = true; 434 } else if (pubsta) { 435 sta = container_of(pubsta, struct sta_info, sta); 436 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 437 use_basicrate = true; 438 } 439 440 if (use_basicrate) 441 rc_send_low_basicrate(&info->control.rates[0], 442 txrc->bss_conf->basic_rates, 443 sband); 444 445 return true; 446 } 447 return false; 448 } 449 450 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) 451 { 452 int j; 453 454 /* See whether the selected rate or anything below it is allowed. */ 455 for (j = *rate_idx; j >= 0; j--) { 456 if (mask & (1 << j)) { 457 /* Okay, found a suitable rate. Use it. */ 458 *rate_idx = j; 459 return true; 460 } 461 } 462 463 /* Try to find a higher rate that would be allowed */ 464 for (j = *rate_idx + 1; j < n_bitrates; j++) { 465 if (mask & (1 << j)) { 466 /* Okay, found a suitable rate. Use it. */ 467 *rate_idx = j; 468 return true; 469 } 470 } 471 return false; 472 } 473 474 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) 475 { 476 int i, j; 477 int ridx, rbit; 478 479 ridx = *rate_idx / 8; 480 rbit = *rate_idx % 8; 481 482 /* sanity check */ 483 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) 484 return false; 485 486 /* See whether the selected rate or anything below it is allowed. */ 487 for (i = ridx; i >= 0; i--) { 488 for (j = rbit; j >= 0; j--) 489 if (mcs_mask[i] & BIT(j)) { 490 *rate_idx = i * 8 + j; 491 return true; 492 } 493 rbit = 7; 494 } 495 496 /* Try to find a higher rate that would be allowed */ 497 ridx = (*rate_idx + 1) / 8; 498 rbit = (*rate_idx + 1) % 8; 499 500 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 501 for (j = rbit; j < 8; j++) 502 if (mcs_mask[i] & BIT(j)) { 503 *rate_idx = i * 8 + j; 504 return true; 505 } 506 rbit = 0; 507 } 508 return false; 509 } 510 511 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) 512 { 513 int i, j; 514 int ridx, rbit; 515 516 ridx = *rate_idx >> 4; 517 rbit = *rate_idx & 0xf; 518 519 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) 520 return false; 521 522 /* See whether the selected rate or anything below it is allowed. */ 523 for (i = ridx; i >= 0; i--) { 524 for (j = rbit; j >= 0; j--) { 525 if (vht_mask[i] & BIT(j)) { 526 *rate_idx = (i << 4) | j; 527 return true; 528 } 529 } 530 rbit = 15; 531 } 532 533 /* Try to find a higher rate that would be allowed */ 534 ridx = (*rate_idx + 1) >> 4; 535 rbit = (*rate_idx + 1) & 0xf; 536 537 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { 538 for (j = rbit; j < 16; j++) { 539 if (vht_mask[i] & BIT(j)) { 540 *rate_idx = (i << 4) | j; 541 return true; 542 } 543 } 544 rbit = 0; 545 } 546 return false; 547 } 548 549 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, 550 struct ieee80211_supported_band *sband, 551 enum nl80211_chan_width chan_width, 552 u32 mask, 553 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 554 u16 vht_mask[NL80211_VHT_NSS_MAX]) 555 { 556 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { 557 /* handle VHT rates */ 558 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) 559 return; 560 561 *rate_idx = 0; 562 /* keep protection flags */ 563 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 564 IEEE80211_TX_RC_USE_CTS_PROTECT | 565 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 566 567 *rate_flags |= IEEE80211_TX_RC_MCS; 568 if (chan_width == NL80211_CHAN_WIDTH_40) 569 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 570 571 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 572 return; 573 574 /* also try the legacy rates. */ 575 *rate_flags &= ~(IEEE80211_TX_RC_MCS | 576 IEEE80211_TX_RC_40_MHZ_WIDTH); 577 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 578 mask)) 579 return; 580 } else if (*rate_flags & IEEE80211_TX_RC_MCS) { 581 /* handle HT rates */ 582 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 583 return; 584 585 /* also try the legacy rates. */ 586 *rate_idx = 0; 587 /* keep protection flags */ 588 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 589 IEEE80211_TX_RC_USE_CTS_PROTECT | 590 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 591 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 592 mask)) 593 return; 594 } else { 595 /* handle legacy rates */ 596 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 597 mask)) 598 return; 599 600 /* if HT BSS, and we handle a data frame, also try HT rates */ 601 switch (chan_width) { 602 case NL80211_CHAN_WIDTH_20_NOHT: 603 case NL80211_CHAN_WIDTH_5: 604 case NL80211_CHAN_WIDTH_10: 605 return; 606 default: 607 break; 608 } 609 610 *rate_idx = 0; 611 /* keep protection flags */ 612 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 613 IEEE80211_TX_RC_USE_CTS_PROTECT | 614 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 615 616 *rate_flags |= IEEE80211_TX_RC_MCS; 617 618 if (chan_width == NL80211_CHAN_WIDTH_40) 619 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 620 621 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 622 return; 623 } 624 625 /* 626 * Uh.. No suitable rate exists. This should not really happen with 627 * sane TX rate mask configurations. However, should someone manage to 628 * configure supported rates and TX rate mask in incompatible way, 629 * allow the frame to be transmitted with whatever the rate control 630 * selected. 631 */ 632 } 633 634 static void rate_fixup_ratelist(struct ieee80211_vif *vif, 635 struct ieee80211_supported_band *sband, 636 struct ieee80211_tx_info *info, 637 struct ieee80211_tx_rate *rates, 638 int max_rates) 639 { 640 struct ieee80211_rate *rate; 641 bool inval = false; 642 int i; 643 644 /* 645 * Set up the RTS/CTS rate as the fastest basic rate 646 * that is not faster than the data rate unless there 647 * is no basic rate slower than the data rate, in which 648 * case we pick the slowest basic rate 649 * 650 * XXX: Should this check all retry rates? 651 */ 652 if (!(rates[0].flags & 653 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { 654 u32 basic_rates = vif->bss_conf.basic_rates; 655 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; 656 657 rate = &sband->bitrates[rates[0].idx]; 658 659 for (i = 0; i < sband->n_bitrates; i++) { 660 /* must be a basic rate */ 661 if (!(basic_rates & BIT(i))) 662 continue; 663 /* must not be faster than the data rate */ 664 if (sband->bitrates[i].bitrate > rate->bitrate) 665 continue; 666 /* maximum */ 667 if (sband->bitrates[baserate].bitrate < 668 sband->bitrates[i].bitrate) 669 baserate = i; 670 } 671 672 info->control.rts_cts_rate_idx = baserate; 673 } 674 675 for (i = 0; i < max_rates; i++) { 676 /* 677 * make sure there's no valid rate following 678 * an invalid one, just in case drivers don't 679 * take the API seriously to stop at -1. 680 */ 681 if (inval) { 682 rates[i].idx = -1; 683 continue; 684 } 685 if (rates[i].idx < 0) { 686 inval = true; 687 continue; 688 } 689 690 /* 691 * For now assume MCS is already set up correctly, this 692 * needs to be fixed. 693 */ 694 if (rates[i].flags & IEEE80211_TX_RC_MCS) { 695 WARN_ON(rates[i].idx > 76); 696 697 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 698 info->control.use_cts_prot) 699 rates[i].flags |= 700 IEEE80211_TX_RC_USE_CTS_PROTECT; 701 continue; 702 } 703 704 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { 705 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); 706 continue; 707 } 708 709 /* set up RTS protection if desired */ 710 if (info->control.use_rts) { 711 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; 712 info->control.use_cts_prot = false; 713 } 714 715 /* RC is busted */ 716 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { 717 rates[i].idx = -1; 718 continue; 719 } 720 721 rate = &sband->bitrates[rates[i].idx]; 722 723 /* set up short preamble */ 724 if (info->control.short_preamble && 725 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 726 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 727 728 /* set up G protection */ 729 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 730 info->control.use_cts_prot && 731 rate->flags & IEEE80211_RATE_ERP_G) 732 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; 733 } 734 } 735 736 737 static void rate_control_fill_sta_table(struct ieee80211_sta *sta, 738 struct ieee80211_tx_info *info, 739 struct ieee80211_tx_rate *rates, 740 int max_rates) 741 { 742 struct ieee80211_sta_rates *ratetbl = NULL; 743 int i; 744 745 if (sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(sta->rates); 747 748 /* Fill remaining rate slots with data from the sta rate table. */ 749 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); 750 for (i = 0; i < max_rates; i++) { 751 if (i < ARRAY_SIZE(info->control.rates) && 752 info->control.rates[i].idx >= 0 && 753 info->control.rates[i].count) { 754 if (rates != info->control.rates) 755 rates[i] = info->control.rates[i]; 756 } else if (ratetbl) { 757 rates[i].idx = ratetbl->rate[i].idx; 758 rates[i].flags = ratetbl->rate[i].flags; 759 if (info->control.use_rts) 760 rates[i].count = ratetbl->rate[i].count_rts; 761 else if (info->control.use_cts_prot) 762 rates[i].count = ratetbl->rate[i].count_cts; 763 else 764 rates[i].count = ratetbl->rate[i].count; 765 } else { 766 rates[i].idx = -1; 767 rates[i].count = 0; 768 } 769 770 if (rates[i].idx < 0 || !rates[i].count) 771 break; 772 } 773 } 774 775 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, 776 struct ieee80211_supported_band *sband, 777 struct ieee80211_sta *sta, u32 *mask, 778 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 779 u16 vht_mask[NL80211_VHT_NSS_MAX]) 780 { 781 u32 i, flags; 782 783 *mask = sdata->rc_rateidx_mask[sband->band]; 784 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chanreq.oper); 785 for (i = 0; i < sband->n_bitrates; i++) { 786 if ((flags & sband->bitrates[i].flags) != flags) 787 *mask &= ~BIT(i); 788 } 789 790 if (*mask == (1 << sband->n_bitrates) - 1 && 791 !sdata->rc_has_mcs_mask[sband->band] && 792 !sdata->rc_has_vht_mcs_mask[sband->band]) 793 return false; 794 795 if (sdata->rc_has_mcs_mask[sband->band]) 796 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], 797 IEEE80211_HT_MCS_MASK_LEN); 798 else 799 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); 800 801 if (sdata->rc_has_vht_mcs_mask[sband->band]) 802 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], 803 sizeof(u16) * NL80211_VHT_NSS_MAX); 804 else 805 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); 806 807 if (sta) { 808 __le16 sta_vht_cap; 809 u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; 810 811 /* Filter out rates that the STA does not support */ 812 *mask &= sta->deflink.supp_rates[sband->band]; 813 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) 814 mcs_mask[i] &= sta->deflink.ht_cap.mcs.rx_mask[i]; 815 816 sta_vht_cap = sta->deflink.vht_cap.vht_mcs.rx_mcs_map; 817 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); 818 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) 819 vht_mask[i] &= sta_vht_mask[i]; 820 } 821 822 return true; 823 } 824 825 static void 826 rate_control_apply_mask_ratetbl(struct sta_info *sta, 827 struct ieee80211_supported_band *sband, 828 struct ieee80211_sta_rates *rates) 829 { 830 int i; 831 u32 mask; 832 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 833 u16 vht_mask[NL80211_VHT_NSS_MAX]; 834 enum nl80211_chan_width chan_width; 835 836 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, 837 mcs_mask, vht_mask)) 838 return; 839 840 chan_width = sta->sdata->vif.bss_conf.chanreq.oper.width; 841 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { 842 if (rates->rate[i].idx < 0) 843 break; 844 845 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, 846 sband, chan_width, mask, mcs_mask, 847 vht_mask); 848 } 849 } 850 851 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, 852 struct ieee80211_sta *sta, 853 struct ieee80211_supported_band *sband, 854 struct ieee80211_tx_rate *rates, 855 int max_rates) 856 { 857 enum nl80211_chan_width chan_width; 858 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 859 u32 mask; 860 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; 861 int i; 862 863 /* 864 * Try to enforce the rateidx mask the user wanted. skip this if the 865 * default mask (allow all rates) is used to save some processing for 866 * the common case. 867 */ 868 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, 869 vht_mask)) 870 return; 871 872 /* 873 * Make sure the rate index selected for each TX rate is 874 * included in the configured mask and change the rate indexes 875 * if needed. 876 */ 877 chan_width = sdata->vif.bss_conf.chanreq.oper.width; 878 for (i = 0; i < max_rates; i++) { 879 /* Skip invalid rates */ 880 if (rates[i].idx < 0) 881 break; 882 883 rate_flags = rates[i].flags; 884 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, 885 chan_width, mask, mcs_mask, vht_mask); 886 rates[i].flags = rate_flags; 887 } 888 } 889 890 void ieee80211_get_tx_rates(struct ieee80211_vif *vif, 891 struct ieee80211_sta *sta, 892 struct sk_buff *skb, 893 struct ieee80211_tx_rate *dest, 894 int max_rates) 895 { 896 struct ieee80211_sub_if_data *sdata; 897 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 898 struct ieee80211_supported_band *sband; 899 u32 mask = ~0; 900 901 rate_control_fill_sta_table(sta, info, dest, max_rates); 902 903 if (!vif) 904 return; 905 906 sdata = vif_to_sdata(vif); 907 sband = sdata->local->hw.wiphy->bands[info->band]; 908 909 if (ieee80211_is_tx_data(skb)) 910 rate_control_apply_mask(sdata, sta, sband, dest, max_rates); 911 912 if (!(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) 913 mask = sdata->rc_rateidx_mask[info->band]; 914 915 if (dest[0].idx < 0) 916 __rate_control_send_low(&sdata->local->hw, sband, sta, info, 917 mask); 918 919 if (sta) 920 rate_fixup_ratelist(vif, sband, info, dest, max_rates); 921 } 922 EXPORT_SYMBOL(ieee80211_get_tx_rates); 923 924 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, 925 struct sta_info *sta, 926 struct ieee80211_tx_rate_control *txrc) 927 { 928 struct rate_control_ref *ref = sdata->local->rate_ctrl; 929 void *priv_sta = NULL; 930 struct ieee80211_sta *ista = NULL; 931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 932 int i; 933 934 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 935 info->control.rates[i].idx = -1; 936 info->control.rates[i].flags = 0; 937 info->control.rates[i].count = 0; 938 } 939 940 if (rate_control_send_low(sta ? &sta->sta : NULL, txrc)) 941 return; 942 943 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) 944 return; 945 946 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { 947 ista = &sta->sta; 948 priv_sta = sta->rate_ctrl_priv; 949 } 950 951 if (ista) { 952 spin_lock_bh(&sta->rate_ctrl_lock); 953 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); 954 spin_unlock_bh(&sta->rate_ctrl_lock); 955 } else { 956 rate_control_send_low(NULL, txrc); 957 } 958 959 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) 960 return; 961 962 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, 963 info->control.rates, 964 ARRAY_SIZE(info->control.rates)); 965 } 966 967 int rate_control_set_rates(struct ieee80211_hw *hw, 968 struct ieee80211_sta *pubsta, 969 struct ieee80211_sta_rates *rates) 970 { 971 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 972 struct ieee80211_sta_rates *old; 973 struct ieee80211_supported_band *sband; 974 975 sband = ieee80211_get_sband(sta->sdata); 976 if (!sband) 977 return -EINVAL; 978 rate_control_apply_mask_ratetbl(sta, sband, rates); 979 /* 980 * mac80211 guarantees that this function will not be called 981 * concurrently, so the following RCU access is safe, even without 982 * extra locking. This can not be checked easily, so we just set 983 * the condition to true. 984 */ 985 old = rcu_dereference_protected(pubsta->rates, true); 986 rcu_assign_pointer(pubsta->rates, rates); 987 if (old) 988 kfree_rcu(old, rcu_head); 989 990 if (sta->uploaded) 991 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); 992 993 ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta)); 994 995 return 0; 996 } 997 EXPORT_SYMBOL(rate_control_set_rates); 998 999 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, 1000 const char *name) 1001 { 1002 struct rate_control_ref *ref; 1003 1004 ASSERT_RTNL(); 1005 1006 if (local->open_count) 1007 return -EBUSY; 1008 1009 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 1010 if (WARN_ON(!local->ops->set_rts_threshold)) 1011 return -EINVAL; 1012 return 0; 1013 } 1014 1015 ref = rate_control_alloc(name, local); 1016 if (!ref) { 1017 wiphy_warn(local->hw.wiphy, 1018 "Failed to select rate control algorithm\n"); 1019 return -ENOENT; 1020 } 1021 1022 WARN_ON(local->rate_ctrl); 1023 local->rate_ctrl = ref; 1024 1025 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", 1026 ref->ops->name); 1027 1028 return 0; 1029 } 1030 1031 void rate_control_deinitialize(struct ieee80211_local *local) 1032 { 1033 struct rate_control_ref *ref; 1034 1035 ref = local->rate_ctrl; 1036 1037 if (!ref) 1038 return; 1039 1040 local->rate_ctrl = NULL; 1041 rate_control_free(local, ref); 1042 } 1043