1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/rtnetlink.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 #include "rate.h" 16 #include "ieee80211_i.h" 17 #include "debugfs.h" 18 19 struct rate_control_alg { 20 struct list_head list; 21 const struct rate_control_ops *ops; 22 }; 23 24 static LIST_HEAD(rate_ctrl_algs); 25 static DEFINE_MUTEX(rate_ctrl_mutex); 26 27 static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; 28 module_param(ieee80211_default_rc_algo, charp, 0644); 29 MODULE_PARM_DESC(ieee80211_default_rc_algo, 30 "Default rate control algorithm for mac80211 to use"); 31 32 void rate_control_rate_init(struct sta_info *sta) 33 { 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_set_rx_nss(sta); 42 43 if (!ref) 44 return; 45 46 rcu_read_lock(); 47 48 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); 49 if (WARN_ON(!chanctx_conf)) { 50 rcu_read_unlock(); 51 return; 52 } 53 54 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; 55 56 spin_lock_bh(&sta->rate_ctrl_lock); 57 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, 58 priv_sta); 59 spin_unlock_bh(&sta->rate_ctrl_lock); 60 rcu_read_unlock(); 61 set_sta_flag(sta, WLAN_STA_RATE_CONTROL); 62 } 63 64 void rate_control_rate_update(struct ieee80211_local *local, 65 struct ieee80211_supported_band *sband, 66 struct sta_info *sta, u32 changed) 67 { 68 struct rate_control_ref *ref = local->rate_ctrl; 69 struct ieee80211_sta *ista = &sta->sta; 70 void *priv_sta = sta->rate_ctrl_priv; 71 struct ieee80211_chanctx_conf *chanctx_conf; 72 73 if (ref && ref->ops->rate_update) { 74 rcu_read_lock(); 75 76 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); 77 if (WARN_ON(!chanctx_conf)) { 78 rcu_read_unlock(); 79 return; 80 } 81 82 spin_lock_bh(&sta->rate_ctrl_lock); 83 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, 84 ista, priv_sta, changed); 85 spin_unlock_bh(&sta->rate_ctrl_lock); 86 rcu_read_unlock(); 87 } 88 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed); 89 } 90 91 int ieee80211_rate_control_register(const struct rate_control_ops *ops) 92 { 93 struct rate_control_alg *alg; 94 95 if (!ops->name) 96 return -EINVAL; 97 98 mutex_lock(&rate_ctrl_mutex); 99 list_for_each_entry(alg, &rate_ctrl_algs, list) { 100 if (!strcmp(alg->ops->name, ops->name)) { 101 /* don't register an algorithm twice */ 102 WARN_ON(1); 103 mutex_unlock(&rate_ctrl_mutex); 104 return -EALREADY; 105 } 106 } 107 108 alg = kzalloc(sizeof(*alg), GFP_KERNEL); 109 if (alg == NULL) { 110 mutex_unlock(&rate_ctrl_mutex); 111 return -ENOMEM; 112 } 113 alg->ops = ops; 114 115 list_add_tail(&alg->list, &rate_ctrl_algs); 116 mutex_unlock(&rate_ctrl_mutex); 117 118 return 0; 119 } 120 EXPORT_SYMBOL(ieee80211_rate_control_register); 121 122 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) 123 { 124 struct rate_control_alg *alg; 125 126 mutex_lock(&rate_ctrl_mutex); 127 list_for_each_entry(alg, &rate_ctrl_algs, list) { 128 if (alg->ops == ops) { 129 list_del(&alg->list); 130 kfree(alg); 131 break; 132 } 133 } 134 mutex_unlock(&rate_ctrl_mutex); 135 } 136 EXPORT_SYMBOL(ieee80211_rate_control_unregister); 137 138 static const struct rate_control_ops * 139 ieee80211_try_rate_control_ops_get(const char *name) 140 { 141 struct rate_control_alg *alg; 142 const struct rate_control_ops *ops = NULL; 143 144 if (!name) 145 return NULL; 146 147 mutex_lock(&rate_ctrl_mutex); 148 list_for_each_entry(alg, &rate_ctrl_algs, list) { 149 if (!strcmp(alg->ops->name, name)) { 150 ops = alg->ops; 151 break; 152 } 153 } 154 mutex_unlock(&rate_ctrl_mutex); 155 return ops; 156 } 157 158 /* Get the rate control algorithm. */ 159 static const struct rate_control_ops * 160 ieee80211_rate_control_ops_get(const char *name) 161 { 162 const struct rate_control_ops *ops; 163 const char *alg_name; 164 165 kernel_param_lock(THIS_MODULE); 166 if (!name) 167 alg_name = ieee80211_default_rc_algo; 168 else 169 alg_name = name; 170 171 ops = ieee80211_try_rate_control_ops_get(alg_name); 172 if (!ops && name) 173 /* try default if specific alg requested but not found */ 174 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); 175 176 /* try built-in one if specific alg requested but not found */ 177 if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) 178 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); 179 kernel_param_unlock(THIS_MODULE); 180 181 return ops; 182 } 183 184 #ifdef CONFIG_MAC80211_DEBUGFS 185 static ssize_t rcname_read(struct file *file, char __user *userbuf, 186 size_t count, loff_t *ppos) 187 { 188 struct rate_control_ref *ref = file->private_data; 189 int len = strlen(ref->ops->name); 190 191 return simple_read_from_buffer(userbuf, count, ppos, 192 ref->ops->name, len); 193 } 194 195 static const struct file_operations rcname_ops = { 196 .read = rcname_read, 197 .open = simple_open, 198 .llseek = default_llseek, 199 }; 200 #endif 201 202 static struct rate_control_ref *rate_control_alloc(const char *name, 203 struct ieee80211_local *local) 204 { 205 struct dentry *debugfsdir = NULL; 206 struct rate_control_ref *ref; 207 208 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); 209 if (!ref) 210 return NULL; 211 ref->local = local; 212 ref->ops = ieee80211_rate_control_ops_get(name); 213 if (!ref->ops) 214 goto free; 215 216 #ifdef CONFIG_MAC80211_DEBUGFS 217 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); 218 local->debugfs.rcdir = debugfsdir; 219 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops); 220 #endif 221 222 ref->priv = ref->ops->alloc(&local->hw, debugfsdir); 223 if (!ref->priv) 224 goto free; 225 return ref; 226 227 free: 228 kfree(ref); 229 return NULL; 230 } 231 232 static void rate_control_free(struct rate_control_ref *ctrl_ref) 233 { 234 ctrl_ref->ops->free(ctrl_ref->priv); 235 236 #ifdef CONFIG_MAC80211_DEBUGFS 237 debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir); 238 ctrl_ref->local->debugfs.rcdir = NULL; 239 #endif 240 241 kfree(ctrl_ref); 242 } 243 244 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) 245 { 246 struct sk_buff *skb = txrc->skb; 247 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 248 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 249 __le16 fc; 250 251 fc = hdr->frame_control; 252 253 return (info->flags & (IEEE80211_TX_CTL_NO_ACK | 254 IEEE80211_TX_CTL_USE_MINRATE)) || 255 !ieee80211_is_data(fc); 256 } 257 258 static void rc_send_low_basicrate(s8 *idx, u32 basic_rates, 259 struct ieee80211_supported_band *sband) 260 { 261 u8 i; 262 263 if (basic_rates == 0) 264 return; /* assume basic rates unknown and accept rate */ 265 if (*idx < 0) 266 return; 267 if (basic_rates & (1 << *idx)) 268 return; /* selected rate is a basic rate */ 269 270 for (i = *idx + 1; i <= sband->n_bitrates; i++) { 271 if (basic_rates & (1 << i)) { 272 *idx = i; 273 return; 274 } 275 } 276 277 /* could not find a basic rate; use original selection */ 278 } 279 280 static void __rate_control_send_low(struct ieee80211_hw *hw, 281 struct ieee80211_supported_band *sband, 282 struct ieee80211_sta *sta, 283 struct ieee80211_tx_info *info, 284 u32 rate_mask) 285 { 286 int i; 287 u32 rate_flags = 288 ieee80211_chandef_rate_flags(&hw->conf.chandef); 289 290 if ((sband->band == IEEE80211_BAND_2GHZ) && 291 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) 292 rate_flags |= IEEE80211_RATE_ERP_G; 293 294 info->control.rates[0].idx = 0; 295 for (i = 0; i < sband->n_bitrates; i++) { 296 if (!(rate_mask & BIT(i))) 297 continue; 298 299 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 300 continue; 301 302 if (!rate_supported(sta, sband->band, i)) 303 continue; 304 305 info->control.rates[0].idx = i; 306 break; 307 } 308 WARN_ON_ONCE(i == sband->n_bitrates); 309 310 info->control.rates[0].count = 311 (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 312 1 : hw->max_rate_tries; 313 314 info->control.skip_table = 1; 315 } 316 317 318 bool rate_control_send_low(struct ieee80211_sta *pubsta, 319 void *priv_sta, 320 struct ieee80211_tx_rate_control *txrc) 321 { 322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 323 struct ieee80211_supported_band *sband = txrc->sband; 324 struct sta_info *sta; 325 int mcast_rate; 326 bool use_basicrate = false; 327 328 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { 329 __rate_control_send_low(txrc->hw, sband, pubsta, info, 330 txrc->rate_idx_mask); 331 332 if (!pubsta && txrc->bss) { 333 mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; 334 if (mcast_rate > 0) { 335 info->control.rates[0].idx = mcast_rate - 1; 336 return true; 337 } 338 use_basicrate = true; 339 } else if (pubsta) { 340 sta = container_of(pubsta, struct sta_info, sta); 341 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 342 use_basicrate = true; 343 } 344 345 if (use_basicrate) 346 rc_send_low_basicrate(&info->control.rates[0].idx, 347 txrc->bss_conf->basic_rates, 348 sband); 349 350 return true; 351 } 352 return false; 353 } 354 EXPORT_SYMBOL(rate_control_send_low); 355 356 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) 357 { 358 int j; 359 360 /* See whether the selected rate or anything below it is allowed. */ 361 for (j = *rate_idx; j >= 0; j--) { 362 if (mask & (1 << j)) { 363 /* Okay, found a suitable rate. Use it. */ 364 *rate_idx = j; 365 return true; 366 } 367 } 368 369 /* Try to find a higher rate that would be allowed */ 370 for (j = *rate_idx + 1; j < n_bitrates; j++) { 371 if (mask & (1 << j)) { 372 /* Okay, found a suitable rate. Use it. */ 373 *rate_idx = j; 374 return true; 375 } 376 } 377 return false; 378 } 379 380 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) 381 { 382 int i, j; 383 int ridx, rbit; 384 385 ridx = *rate_idx / 8; 386 rbit = *rate_idx % 8; 387 388 /* sanity check */ 389 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) 390 return false; 391 392 /* See whether the selected rate or anything below it is allowed. */ 393 for (i = ridx; i >= 0; i--) { 394 for (j = rbit; j >= 0; j--) 395 if (mcs_mask[i] & BIT(j)) { 396 *rate_idx = i * 8 + j; 397 return true; 398 } 399 rbit = 7; 400 } 401 402 /* Try to find a higher rate that would be allowed */ 403 ridx = (*rate_idx + 1) / 8; 404 rbit = (*rate_idx + 1) % 8; 405 406 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 407 for (j = rbit; j < 8; j++) 408 if (mcs_mask[i] & BIT(j)) { 409 *rate_idx = i * 8 + j; 410 return true; 411 } 412 rbit = 0; 413 } 414 return false; 415 } 416 417 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) 418 { 419 int i, j; 420 int ridx, rbit; 421 422 ridx = *rate_idx >> 4; 423 rbit = *rate_idx & 0xf; 424 425 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) 426 return false; 427 428 /* See whether the selected rate or anything below it is allowed. */ 429 for (i = ridx; i >= 0; i--) { 430 for (j = rbit; j >= 0; j--) { 431 if (vht_mask[i] & BIT(j)) { 432 *rate_idx = (i << 4) | j; 433 return true; 434 } 435 } 436 rbit = 15; 437 } 438 439 /* Try to find a higher rate that would be allowed */ 440 ridx = (*rate_idx + 1) >> 4; 441 rbit = (*rate_idx + 1) & 0xf; 442 443 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { 444 for (j = rbit; j < 16; j++) { 445 if (vht_mask[i] & BIT(j)) { 446 *rate_idx = (i << 4) | j; 447 return true; 448 } 449 } 450 rbit = 0; 451 } 452 return false; 453 } 454 455 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, 456 struct ieee80211_supported_band *sband, 457 enum nl80211_chan_width chan_width, 458 u32 mask, 459 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 460 u16 vht_mask[NL80211_VHT_NSS_MAX]) 461 { 462 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { 463 /* handle VHT rates */ 464 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) 465 return; 466 467 *rate_idx = 0; 468 /* keep protection flags */ 469 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 470 IEEE80211_TX_RC_USE_CTS_PROTECT | 471 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 472 473 *rate_flags |= IEEE80211_TX_RC_MCS; 474 if (chan_width == NL80211_CHAN_WIDTH_40) 475 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 476 477 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 478 return; 479 480 /* also try the legacy rates. */ 481 *rate_flags &= ~(IEEE80211_TX_RC_MCS | 482 IEEE80211_TX_RC_40_MHZ_WIDTH); 483 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 484 mask)) 485 return; 486 } else if (*rate_flags & IEEE80211_TX_RC_MCS) { 487 /* handle HT rates */ 488 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 489 return; 490 491 /* also try the legacy rates. */ 492 *rate_idx = 0; 493 /* keep protection flags */ 494 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 495 IEEE80211_TX_RC_USE_CTS_PROTECT | 496 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 497 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 498 mask)) 499 return; 500 } else { 501 /* handle legacy rates */ 502 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 503 mask)) 504 return; 505 506 /* if HT BSS, and we handle a data frame, also try HT rates */ 507 switch (chan_width) { 508 case NL80211_CHAN_WIDTH_20_NOHT: 509 case NL80211_CHAN_WIDTH_5: 510 case NL80211_CHAN_WIDTH_10: 511 return; 512 default: 513 break; 514 } 515 516 *rate_idx = 0; 517 /* keep protection flags */ 518 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 519 IEEE80211_TX_RC_USE_CTS_PROTECT | 520 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 521 522 *rate_flags |= IEEE80211_TX_RC_MCS; 523 524 if (chan_width == NL80211_CHAN_WIDTH_40) 525 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 526 527 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 528 return; 529 } 530 531 /* 532 * Uh.. No suitable rate exists. This should not really happen with 533 * sane TX rate mask configurations. However, should someone manage to 534 * configure supported rates and TX rate mask in incompatible way, 535 * allow the frame to be transmitted with whatever the rate control 536 * selected. 537 */ 538 } 539 540 static void rate_fixup_ratelist(struct ieee80211_vif *vif, 541 struct ieee80211_supported_band *sband, 542 struct ieee80211_tx_info *info, 543 struct ieee80211_tx_rate *rates, 544 int max_rates) 545 { 546 struct ieee80211_rate *rate; 547 bool inval = false; 548 int i; 549 550 /* 551 * Set up the RTS/CTS rate as the fastest basic rate 552 * that is not faster than the data rate unless there 553 * is no basic rate slower than the data rate, in which 554 * case we pick the slowest basic rate 555 * 556 * XXX: Should this check all retry rates? 557 */ 558 if (!(rates[0].flags & 559 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { 560 u32 basic_rates = vif->bss_conf.basic_rates; 561 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; 562 563 rate = &sband->bitrates[rates[0].idx]; 564 565 for (i = 0; i < sband->n_bitrates; i++) { 566 /* must be a basic rate */ 567 if (!(basic_rates & BIT(i))) 568 continue; 569 /* must not be faster than the data rate */ 570 if (sband->bitrates[i].bitrate > rate->bitrate) 571 continue; 572 /* maximum */ 573 if (sband->bitrates[baserate].bitrate < 574 sband->bitrates[i].bitrate) 575 baserate = i; 576 } 577 578 info->control.rts_cts_rate_idx = baserate; 579 } 580 581 for (i = 0; i < max_rates; i++) { 582 /* 583 * make sure there's no valid rate following 584 * an invalid one, just in case drivers don't 585 * take the API seriously to stop at -1. 586 */ 587 if (inval) { 588 rates[i].idx = -1; 589 continue; 590 } 591 if (rates[i].idx < 0) { 592 inval = true; 593 continue; 594 } 595 596 /* 597 * For now assume MCS is already set up correctly, this 598 * needs to be fixed. 599 */ 600 if (rates[i].flags & IEEE80211_TX_RC_MCS) { 601 WARN_ON(rates[i].idx > 76); 602 603 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 604 info->control.use_cts_prot) 605 rates[i].flags |= 606 IEEE80211_TX_RC_USE_CTS_PROTECT; 607 continue; 608 } 609 610 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { 611 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); 612 continue; 613 } 614 615 /* set up RTS protection if desired */ 616 if (info->control.use_rts) { 617 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; 618 info->control.use_cts_prot = false; 619 } 620 621 /* RC is busted */ 622 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { 623 rates[i].idx = -1; 624 continue; 625 } 626 627 rate = &sband->bitrates[rates[i].idx]; 628 629 /* set up short preamble */ 630 if (info->control.short_preamble && 631 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 632 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 633 634 /* set up G protection */ 635 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 636 info->control.use_cts_prot && 637 rate->flags & IEEE80211_RATE_ERP_G) 638 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; 639 } 640 } 641 642 643 static void rate_control_fill_sta_table(struct ieee80211_sta *sta, 644 struct ieee80211_tx_info *info, 645 struct ieee80211_tx_rate *rates, 646 int max_rates) 647 { 648 struct ieee80211_sta_rates *ratetbl = NULL; 649 int i; 650 651 if (sta && !info->control.skip_table) 652 ratetbl = rcu_dereference(sta->rates); 653 654 /* Fill remaining rate slots with data from the sta rate table. */ 655 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); 656 for (i = 0; i < max_rates; i++) { 657 if (i < ARRAY_SIZE(info->control.rates) && 658 info->control.rates[i].idx >= 0 && 659 info->control.rates[i].count) { 660 if (rates != info->control.rates) 661 rates[i] = info->control.rates[i]; 662 } else if (ratetbl) { 663 rates[i].idx = ratetbl->rate[i].idx; 664 rates[i].flags = ratetbl->rate[i].flags; 665 if (info->control.use_rts) 666 rates[i].count = ratetbl->rate[i].count_rts; 667 else if (info->control.use_cts_prot) 668 rates[i].count = ratetbl->rate[i].count_cts; 669 else 670 rates[i].count = ratetbl->rate[i].count; 671 } else { 672 rates[i].idx = -1; 673 rates[i].count = 0; 674 } 675 676 if (rates[i].idx < 0 || !rates[i].count) 677 break; 678 } 679 } 680 681 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, 682 struct ieee80211_supported_band *sband, 683 struct ieee80211_sta *sta, u32 *mask, 684 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 685 u16 vht_mask[NL80211_VHT_NSS_MAX]) 686 { 687 u32 i, flags; 688 689 *mask = sdata->rc_rateidx_mask[sband->band]; 690 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 691 for (i = 0; i < sband->n_bitrates; i++) { 692 if ((flags & sband->bitrates[i].flags) != flags) 693 *mask &= ~BIT(i); 694 } 695 696 if (*mask == (1 << sband->n_bitrates) - 1 && 697 !sdata->rc_has_mcs_mask[sband->band] && 698 !sdata->rc_has_vht_mcs_mask[sband->band]) 699 return false; 700 701 if (sdata->rc_has_mcs_mask[sband->band]) 702 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], 703 IEEE80211_HT_MCS_MASK_LEN); 704 else 705 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); 706 707 if (sdata->rc_has_vht_mcs_mask[sband->band]) 708 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], 709 sizeof(u16) * NL80211_VHT_NSS_MAX); 710 else 711 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); 712 713 if (sta) { 714 __le16 sta_vht_cap; 715 u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; 716 717 /* Filter out rates that the STA does not support */ 718 *mask &= sta->supp_rates[sband->band]; 719 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) 720 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; 721 722 sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map; 723 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); 724 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) 725 vht_mask[i] &= sta_vht_mask[i]; 726 } 727 728 return true; 729 } 730 731 static void 732 rate_control_apply_mask_ratetbl(struct sta_info *sta, 733 struct ieee80211_supported_band *sband, 734 struct ieee80211_sta_rates *rates) 735 { 736 int i; 737 u32 mask; 738 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 739 u16 vht_mask[NL80211_VHT_NSS_MAX]; 740 enum nl80211_chan_width chan_width; 741 742 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, 743 mcs_mask, vht_mask)) 744 return; 745 746 chan_width = sta->sdata->vif.bss_conf.chandef.width; 747 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { 748 if (rates->rate[i].idx < 0) 749 break; 750 751 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, 752 sband, chan_width, mask, mcs_mask, 753 vht_mask); 754 } 755 } 756 757 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, 758 struct ieee80211_sta *sta, 759 struct ieee80211_supported_band *sband, 760 struct ieee80211_tx_rate *rates, 761 int max_rates) 762 { 763 enum nl80211_chan_width chan_width; 764 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 765 u32 mask; 766 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; 767 int i; 768 769 /* 770 * Try to enforce the rateidx mask the user wanted. skip this if the 771 * default mask (allow all rates) is used to save some processing for 772 * the common case. 773 */ 774 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, 775 vht_mask)) 776 return; 777 778 /* 779 * Make sure the rate index selected for each TX rate is 780 * included in the configured mask and change the rate indexes 781 * if needed. 782 */ 783 chan_width = sdata->vif.bss_conf.chandef.width; 784 for (i = 0; i < max_rates; i++) { 785 /* Skip invalid rates */ 786 if (rates[i].idx < 0) 787 break; 788 789 rate_flags = rates[i].flags; 790 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, 791 chan_width, mask, mcs_mask, vht_mask); 792 rates[i].flags = rate_flags; 793 } 794 } 795 796 void ieee80211_get_tx_rates(struct ieee80211_vif *vif, 797 struct ieee80211_sta *sta, 798 struct sk_buff *skb, 799 struct ieee80211_tx_rate *dest, 800 int max_rates) 801 { 802 struct ieee80211_sub_if_data *sdata; 803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 804 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 805 struct ieee80211_supported_band *sband; 806 807 rate_control_fill_sta_table(sta, info, dest, max_rates); 808 809 if (!vif) 810 return; 811 812 sdata = vif_to_sdata(vif); 813 sband = sdata->local->hw.wiphy->bands[info->band]; 814 815 if (ieee80211_is_data(hdr->frame_control)) 816 rate_control_apply_mask(sdata, sta, sband, dest, max_rates); 817 818 if (dest[0].idx < 0) 819 __rate_control_send_low(&sdata->local->hw, sband, sta, info, 820 sdata->rc_rateidx_mask[info->band]); 821 822 if (sta) 823 rate_fixup_ratelist(vif, sband, info, dest, max_rates); 824 } 825 EXPORT_SYMBOL(ieee80211_get_tx_rates); 826 827 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, 828 struct sta_info *sta, 829 struct ieee80211_tx_rate_control *txrc) 830 { 831 struct rate_control_ref *ref = sdata->local->rate_ctrl; 832 void *priv_sta = NULL; 833 struct ieee80211_sta *ista = NULL; 834 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 835 int i; 836 837 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { 838 ista = &sta->sta; 839 priv_sta = sta->rate_ctrl_priv; 840 } 841 842 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 843 info->control.rates[i].idx = -1; 844 info->control.rates[i].flags = 0; 845 info->control.rates[i].count = 0; 846 } 847 848 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) 849 return; 850 851 if (ista) { 852 spin_lock_bh(&sta->rate_ctrl_lock); 853 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); 854 spin_unlock_bh(&sta->rate_ctrl_lock); 855 } else { 856 ref->ops->get_rate(ref->priv, NULL, NULL, txrc); 857 } 858 859 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) 860 return; 861 862 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, 863 info->control.rates, 864 ARRAY_SIZE(info->control.rates)); 865 } 866 867 int rate_control_set_rates(struct ieee80211_hw *hw, 868 struct ieee80211_sta *pubsta, 869 struct ieee80211_sta_rates *rates) 870 { 871 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 872 struct ieee80211_sta_rates *old; 873 struct ieee80211_supported_band *sband; 874 875 sband = hw->wiphy->bands[ieee80211_get_sdata_band(sta->sdata)]; 876 rate_control_apply_mask_ratetbl(sta, sband, rates); 877 /* 878 * mac80211 guarantees that this function will not be called 879 * concurrently, so the following RCU access is safe, even without 880 * extra locking. This can not be checked easily, so we just set 881 * the condition to true. 882 */ 883 old = rcu_dereference_protected(pubsta->rates, true); 884 rcu_assign_pointer(pubsta->rates, rates); 885 if (old) 886 kfree_rcu(old, rcu_head); 887 888 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); 889 890 return 0; 891 } 892 EXPORT_SYMBOL(rate_control_set_rates); 893 894 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, 895 const char *name) 896 { 897 struct rate_control_ref *ref; 898 899 ASSERT_RTNL(); 900 901 if (local->open_count) 902 return -EBUSY; 903 904 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 905 if (WARN_ON(!local->ops->set_rts_threshold)) 906 return -EINVAL; 907 return 0; 908 } 909 910 ref = rate_control_alloc(name, local); 911 if (!ref) { 912 wiphy_warn(local->hw.wiphy, 913 "Failed to select rate control algorithm\n"); 914 return -ENOENT; 915 } 916 917 WARN_ON(local->rate_ctrl); 918 local->rate_ctrl = ref; 919 920 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", 921 ref->ops->name); 922 923 return 0; 924 } 925 926 void rate_control_deinitialize(struct ieee80211_local *local) 927 { 928 struct rate_control_ref *ref; 929 930 ref = local->rate_ctrl; 931 932 if (!ref) 933 return; 934 935 local->rate_ctrl = NULL; 936 rate_control_free(ref); 937 } 938 939