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