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