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 u32 rate_flags = 0; 372 int i; 373 374 if (sband->band == NL80211_BAND_S1GHZ) { 375 info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS; 376 info->control.rates[0].idx = 0; 377 return; 378 } 379 380 if ((sband->band == NL80211_BAND_2GHZ) && 381 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) 382 rate_flags |= IEEE80211_RATE_ERP_G; 383 384 info->control.rates[0].idx = 0; 385 for (i = 0; i < sband->n_bitrates; i++) { 386 if (!(rate_mask & BIT(i))) 387 continue; 388 389 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 390 continue; 391 392 if (!rate_supported(sta, sband->band, i)) 393 continue; 394 395 info->control.rates[0].idx = i; 396 break; 397 } 398 WARN_ONCE(i == sband->n_bitrates, 399 "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n", 400 sta ? sta->addr : NULL, 401 sta ? sta->deflink.supp_rates[sband->band] : -1, 402 sband->band, 403 rate_mask, rate_flags); 404 405 info->control.rates[0].count = 406 (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 407 1 : hw->max_rate_tries; 408 409 info->control.skip_table = 1; 410 } 411 412 413 static bool rate_control_send_low(struct ieee80211_sta *pubsta, 414 struct ieee80211_tx_rate_control *txrc) 415 { 416 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 417 struct ieee80211_supported_band *sband = txrc->sband; 418 struct sta_info *sta; 419 int mcast_rate; 420 bool use_basicrate = false; 421 422 if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) { 423 __rate_control_send_low(txrc->hw, sband, pubsta, info, 424 txrc->rate_idx_mask); 425 426 if (!pubsta && txrc->bss) { 427 mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; 428 if (mcast_rate > 0) { 429 info->control.rates[0].idx = mcast_rate - 1; 430 return true; 431 } 432 use_basicrate = true; 433 } else if (pubsta) { 434 sta = container_of(pubsta, struct sta_info, sta); 435 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 436 use_basicrate = true; 437 } 438 439 if (use_basicrate) 440 rc_send_low_basicrate(&info->control.rates[0], 441 txrc->bss_conf->basic_rates, 442 sband); 443 444 return true; 445 } 446 return false; 447 } 448 449 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) 450 { 451 int j; 452 453 /* See whether the selected rate or anything below it is allowed. */ 454 for (j = *rate_idx; j >= 0; j--) { 455 if (mask & (1 << j)) { 456 /* Okay, found a suitable rate. Use it. */ 457 *rate_idx = j; 458 return true; 459 } 460 } 461 462 /* Try to find a higher rate that would be allowed */ 463 for (j = *rate_idx + 1; j < n_bitrates; j++) { 464 if (mask & (1 << j)) { 465 /* Okay, found a suitable rate. Use it. */ 466 *rate_idx = j; 467 return true; 468 } 469 } 470 return false; 471 } 472 473 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) 474 { 475 int i, j; 476 int ridx, rbit; 477 478 ridx = *rate_idx / 8; 479 rbit = *rate_idx % 8; 480 481 /* sanity check */ 482 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) 483 return false; 484 485 /* See whether the selected rate or anything below it is allowed. */ 486 for (i = ridx; i >= 0; i--) { 487 for (j = rbit; j >= 0; j--) 488 if (mcs_mask[i] & BIT(j)) { 489 *rate_idx = i * 8 + j; 490 return true; 491 } 492 rbit = 7; 493 } 494 495 /* Try to find a higher rate that would be allowed */ 496 ridx = (*rate_idx + 1) / 8; 497 rbit = (*rate_idx + 1) % 8; 498 499 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 500 for (j = rbit; j < 8; j++) 501 if (mcs_mask[i] & BIT(j)) { 502 *rate_idx = i * 8 + j; 503 return true; 504 } 505 rbit = 0; 506 } 507 return false; 508 } 509 510 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) 511 { 512 int i, j; 513 int ridx, rbit; 514 515 ridx = *rate_idx >> 4; 516 rbit = *rate_idx & 0xf; 517 518 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) 519 return false; 520 521 /* See whether the selected rate or anything below it is allowed. */ 522 for (i = ridx; i >= 0; i--) { 523 for (j = rbit; j >= 0; j--) { 524 if (vht_mask[i] & BIT(j)) { 525 *rate_idx = (i << 4) | j; 526 return true; 527 } 528 } 529 rbit = 15; 530 } 531 532 /* Try to find a higher rate that would be allowed */ 533 ridx = (*rate_idx + 1) >> 4; 534 rbit = (*rate_idx + 1) & 0xf; 535 536 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { 537 for (j = rbit; j < 16; j++) { 538 if (vht_mask[i] & BIT(j)) { 539 *rate_idx = (i << 4) | j; 540 return true; 541 } 542 } 543 rbit = 0; 544 } 545 return false; 546 } 547 548 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, 549 struct ieee80211_supported_band *sband, 550 enum nl80211_chan_width chan_width, 551 u32 mask, 552 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 553 u16 vht_mask[NL80211_VHT_NSS_MAX]) 554 { 555 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { 556 /* handle VHT rates */ 557 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) 558 return; 559 560 *rate_idx = 0; 561 /* keep protection flags */ 562 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 563 IEEE80211_TX_RC_USE_CTS_PROTECT | 564 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 565 566 *rate_flags |= IEEE80211_TX_RC_MCS; 567 if (chan_width == NL80211_CHAN_WIDTH_40) 568 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 569 570 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 571 return; 572 573 /* also try the legacy rates. */ 574 *rate_flags &= ~(IEEE80211_TX_RC_MCS | 575 IEEE80211_TX_RC_40_MHZ_WIDTH); 576 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 577 mask)) 578 return; 579 } else if (*rate_flags & IEEE80211_TX_RC_MCS) { 580 /* handle HT rates */ 581 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 582 return; 583 584 /* also try the legacy rates. */ 585 *rate_idx = 0; 586 /* keep protection flags */ 587 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 588 IEEE80211_TX_RC_USE_CTS_PROTECT | 589 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 590 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 591 mask)) 592 return; 593 } else { 594 /* handle legacy rates */ 595 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 596 mask)) 597 return; 598 599 /* if HT BSS, and we handle a data frame, also try HT rates */ 600 switch (chan_width) { 601 case NL80211_CHAN_WIDTH_20_NOHT: 602 case NL80211_CHAN_WIDTH_5: 603 case NL80211_CHAN_WIDTH_10: 604 return; 605 default: 606 break; 607 } 608 609 *rate_idx = 0; 610 /* keep protection flags */ 611 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 612 IEEE80211_TX_RC_USE_CTS_PROTECT | 613 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 614 615 *rate_flags |= IEEE80211_TX_RC_MCS; 616 617 if (chan_width == NL80211_CHAN_WIDTH_40) 618 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 619 620 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 621 return; 622 } 623 624 /* 625 * Uh.. No suitable rate exists. This should not really happen with 626 * sane TX rate mask configurations. However, should someone manage to 627 * configure supported rates and TX rate mask in incompatible way, 628 * allow the frame to be transmitted with whatever the rate control 629 * selected. 630 */ 631 } 632 633 static void rate_fixup_ratelist(struct ieee80211_vif *vif, 634 struct ieee80211_supported_band *sband, 635 struct ieee80211_tx_info *info, 636 struct ieee80211_tx_rate *rates, 637 int max_rates) 638 { 639 struct ieee80211_rate *rate; 640 bool inval = false; 641 int i; 642 643 /* 644 * Set up the RTS/CTS rate as the fastest basic rate 645 * that is not faster than the data rate unless there 646 * is no basic rate slower than the data rate, in which 647 * case we pick the slowest basic rate 648 * 649 * XXX: Should this check all retry rates? 650 */ 651 if (!(rates[0].flags & 652 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { 653 u32 basic_rates = vif->bss_conf.basic_rates; 654 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; 655 656 rate = &sband->bitrates[rates[0].idx]; 657 658 for (i = 0; i < sband->n_bitrates; i++) { 659 /* must be a basic rate */ 660 if (!(basic_rates & BIT(i))) 661 continue; 662 /* must not be faster than the data rate */ 663 if (sband->bitrates[i].bitrate > rate->bitrate) 664 continue; 665 /* maximum */ 666 if (sband->bitrates[baserate].bitrate < 667 sband->bitrates[i].bitrate) 668 baserate = i; 669 } 670 671 info->control.rts_cts_rate_idx = baserate; 672 } 673 674 for (i = 0; i < max_rates; i++) { 675 /* 676 * make sure there's no valid rate following 677 * an invalid one, just in case drivers don't 678 * take the API seriously to stop at -1. 679 */ 680 if (inval) { 681 rates[i].idx = -1; 682 continue; 683 } 684 if (rates[i].idx < 0) { 685 inval = true; 686 continue; 687 } 688 689 /* 690 * For now assume MCS is already set up correctly, this 691 * needs to be fixed. 692 */ 693 if (rates[i].flags & IEEE80211_TX_RC_MCS) { 694 WARN_ON(rates[i].idx > 76); 695 696 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 697 info->control.use_cts_prot) 698 rates[i].flags |= 699 IEEE80211_TX_RC_USE_CTS_PROTECT; 700 continue; 701 } 702 703 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { 704 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); 705 continue; 706 } 707 708 /* set up RTS protection if desired */ 709 if (info->control.use_rts) { 710 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; 711 info->control.use_cts_prot = false; 712 } 713 714 /* RC is busted */ 715 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { 716 rates[i].idx = -1; 717 continue; 718 } 719 720 rate = &sband->bitrates[rates[i].idx]; 721 722 /* set up short preamble */ 723 if (info->control.short_preamble && 724 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 725 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 726 727 /* set up G protection */ 728 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 729 info->control.use_cts_prot && 730 rate->flags & IEEE80211_RATE_ERP_G) 731 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; 732 } 733 } 734 735 736 static void rate_control_fill_sta_table(struct ieee80211_sta *sta, 737 struct ieee80211_tx_info *info, 738 struct ieee80211_tx_rate *rates, 739 int max_rates) 740 { 741 struct ieee80211_sta_rates *ratetbl = NULL; 742 int i; 743 744 if (sta && !info->control.skip_table) 745 ratetbl = rcu_dereference(sta->rates); 746 747 /* Fill remaining rate slots with data from the sta rate table. */ 748 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); 749 for (i = 0; i < max_rates; i++) { 750 if (i < ARRAY_SIZE(info->control.rates) && 751 info->control.rates[i].idx >= 0 && 752 info->control.rates[i].count) { 753 if (rates != info->control.rates) 754 rates[i] = info->control.rates[i]; 755 } else if (ratetbl) { 756 rates[i].idx = ratetbl->rate[i].idx; 757 rates[i].flags = ratetbl->rate[i].flags; 758 if (info->control.use_rts) 759 rates[i].count = ratetbl->rate[i].count_rts; 760 else if (info->control.use_cts_prot) 761 rates[i].count = ratetbl->rate[i].count_cts; 762 else 763 rates[i].count = ratetbl->rate[i].count; 764 } else { 765 rates[i].idx = -1; 766 rates[i].count = 0; 767 } 768 769 if (rates[i].idx < 0 || !rates[i].count) 770 break; 771 } 772 } 773 774 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, 775 struct ieee80211_supported_band *sband, 776 struct ieee80211_sta *sta, u32 *mask, 777 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 778 u16 vht_mask[NL80211_VHT_NSS_MAX]) 779 { 780 u32 i; 781 782 *mask = sdata->rc_rateidx_mask[sband->band]; 783 784 if (*mask == (1 << sband->n_bitrates) - 1 && 785 !sdata->rc_has_mcs_mask[sband->band] && 786 !sdata->rc_has_vht_mcs_mask[sband->band]) 787 return false; 788 789 if (sdata->rc_has_mcs_mask[sband->band]) 790 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], 791 IEEE80211_HT_MCS_MASK_LEN); 792 else 793 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); 794 795 if (sdata->rc_has_vht_mcs_mask[sband->band]) 796 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], 797 sizeof(u16) * NL80211_VHT_NSS_MAX); 798 else 799 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); 800 801 if (sta) { 802 __le16 sta_vht_cap; 803 u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; 804 805 /* Filter out rates that the STA does not support */ 806 *mask &= sta->deflink.supp_rates[sband->band]; 807 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) 808 mcs_mask[i] &= sta->deflink.ht_cap.mcs.rx_mask[i]; 809 810 sta_vht_cap = sta->deflink.vht_cap.vht_mcs.rx_mcs_map; 811 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); 812 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) 813 vht_mask[i] &= sta_vht_mask[i]; 814 } 815 816 return true; 817 } 818 819 static void 820 rate_control_apply_mask_ratetbl(struct sta_info *sta, 821 struct ieee80211_supported_band *sband, 822 struct ieee80211_sta_rates *rates) 823 { 824 int i; 825 u32 mask; 826 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 827 u16 vht_mask[NL80211_VHT_NSS_MAX]; 828 enum nl80211_chan_width chan_width; 829 830 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, 831 mcs_mask, vht_mask)) 832 return; 833 834 chan_width = sta->sdata->vif.bss_conf.chanreq.oper.width; 835 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { 836 if (rates->rate[i].idx < 0) 837 break; 838 839 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, 840 sband, chan_width, mask, mcs_mask, 841 vht_mask); 842 } 843 } 844 845 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, 846 struct ieee80211_sta *sta, 847 struct ieee80211_supported_band *sband, 848 struct ieee80211_tx_rate *rates, 849 int max_rates) 850 { 851 enum nl80211_chan_width chan_width; 852 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 853 u32 mask; 854 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; 855 int i; 856 857 /* 858 * Try to enforce the rateidx mask the user wanted. skip this if the 859 * default mask (allow all rates) is used to save some processing for 860 * the common case. 861 */ 862 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, 863 vht_mask)) 864 return; 865 866 /* 867 * Make sure the rate index selected for each TX rate is 868 * included in the configured mask and change the rate indexes 869 * if needed. 870 */ 871 chan_width = sdata->vif.bss_conf.chanreq.oper.width; 872 for (i = 0; i < max_rates; i++) { 873 /* Skip invalid rates */ 874 if (rates[i].idx < 0) 875 break; 876 877 rate_flags = rates[i].flags; 878 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, 879 chan_width, mask, mcs_mask, vht_mask); 880 rates[i].flags = rate_flags; 881 } 882 } 883 884 void ieee80211_get_tx_rates(struct ieee80211_vif *vif, 885 struct ieee80211_sta *sta, 886 struct sk_buff *skb, 887 struct ieee80211_tx_rate *dest, 888 int max_rates) 889 { 890 struct ieee80211_sub_if_data *sdata; 891 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 892 struct ieee80211_supported_band *sband; 893 u32 mask = ~0; 894 895 rate_control_fill_sta_table(sta, info, dest, max_rates); 896 897 if (!vif) 898 return; 899 900 sdata = vif_to_sdata(vif); 901 sband = sdata->local->hw.wiphy->bands[info->band]; 902 903 if (ieee80211_is_tx_data(skb)) 904 rate_control_apply_mask(sdata, sta, sband, dest, max_rates); 905 906 if (!(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) 907 mask = sdata->rc_rateidx_mask[info->band]; 908 909 if (dest[0].idx < 0) 910 __rate_control_send_low(&sdata->local->hw, sband, sta, info, 911 mask); 912 913 if (sta) 914 rate_fixup_ratelist(vif, sband, info, dest, max_rates); 915 } 916 EXPORT_SYMBOL(ieee80211_get_tx_rates); 917 918 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, 919 struct sta_info *sta, 920 struct ieee80211_tx_rate_control *txrc) 921 { 922 struct rate_control_ref *ref = sdata->local->rate_ctrl; 923 void *priv_sta = NULL; 924 struct ieee80211_sta *ista = NULL; 925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 926 int i; 927 928 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 929 info->control.rates[i].idx = -1; 930 info->control.rates[i].flags = 0; 931 info->control.rates[i].count = 0; 932 } 933 934 if (rate_control_send_low(sta ? &sta->sta : NULL, txrc)) 935 return; 936 937 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) 938 return; 939 940 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { 941 ista = &sta->sta; 942 priv_sta = sta->rate_ctrl_priv; 943 } 944 945 if (ista) { 946 spin_lock_bh(&sta->rate_ctrl_lock); 947 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); 948 spin_unlock_bh(&sta->rate_ctrl_lock); 949 } else { 950 rate_control_send_low(NULL, txrc); 951 } 952 953 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) 954 return; 955 956 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, 957 info->control.rates, 958 ARRAY_SIZE(info->control.rates)); 959 } 960 961 int rate_control_set_rates(struct ieee80211_hw *hw, 962 struct ieee80211_sta *pubsta, 963 struct ieee80211_sta_rates *rates) 964 { 965 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 966 struct ieee80211_sta_rates *old; 967 struct ieee80211_supported_band *sband; 968 969 sband = ieee80211_get_sband(sta->sdata); 970 if (!sband) 971 return -EINVAL; 972 rate_control_apply_mask_ratetbl(sta, sband, rates); 973 /* 974 * mac80211 guarantees that this function will not be called 975 * concurrently, so the following RCU access is safe, even without 976 * extra locking. This can not be checked easily, so we just set 977 * the condition to true. 978 */ 979 old = rcu_dereference_protected(pubsta->rates, true); 980 rcu_assign_pointer(pubsta->rates, rates); 981 if (old) 982 kfree_rcu(old, rcu_head); 983 984 if (sta->uploaded) 985 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); 986 987 return 0; 988 } 989 EXPORT_SYMBOL(rate_control_set_rates); 990 991 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, 992 const char *name) 993 { 994 struct rate_control_ref *ref; 995 996 ASSERT_RTNL(); 997 998 if (local->open_count) 999 return -EBUSY; 1000 1001 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 1002 if (WARN_ON(!local->ops->set_rts_threshold)) 1003 return -EINVAL; 1004 return 0; 1005 } 1006 1007 ref = rate_control_alloc(name, local); 1008 if (!ref) { 1009 wiphy_warn(local->hw.wiphy, 1010 "Failed to select rate control algorithm\n"); 1011 return -ENOENT; 1012 } 1013 1014 WARN_ON(local->rate_ctrl); 1015 local->rate_ctrl = ref; 1016 1017 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", 1018 ref->ops->name); 1019 1020 return 0; 1021 } 1022 1023 void rate_control_deinitialize(struct ieee80211_local *local) 1024 { 1025 struct rate_control_ref *ref; 1026 1027 ref = local->rate_ctrl; 1028 1029 if (!ref) 1030 return; 1031 1032 local->rate_ctrl = NULL; 1033 rate_control_free(local, ref); 1034 } 1035