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 ieee80211_recalc_min_chandef(sta->sdata); 44 45 if (!ref) 46 return; 47 48 rcu_read_lock(); 49 50 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); 51 if (WARN_ON(!chanctx_conf)) { 52 rcu_read_unlock(); 53 return; 54 } 55 56 sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band]; 57 58 spin_lock_bh(&sta->rate_ctrl_lock); 59 ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista, 60 priv_sta); 61 spin_unlock_bh(&sta->rate_ctrl_lock); 62 rcu_read_unlock(); 63 set_sta_flag(sta, WLAN_STA_RATE_CONTROL); 64 } 65 66 void rate_control_rate_update(struct ieee80211_local *local, 67 struct ieee80211_supported_band *sband, 68 struct sta_info *sta, u32 changed) 69 { 70 struct rate_control_ref *ref = local->rate_ctrl; 71 struct ieee80211_sta *ista = &sta->sta; 72 void *priv_sta = sta->rate_ctrl_priv; 73 struct ieee80211_chanctx_conf *chanctx_conf; 74 75 if (ref && ref->ops->rate_update) { 76 rcu_read_lock(); 77 78 chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf); 79 if (WARN_ON(!chanctx_conf)) { 80 rcu_read_unlock(); 81 return; 82 } 83 84 spin_lock_bh(&sta->rate_ctrl_lock); 85 ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def, 86 ista, priv_sta, changed); 87 spin_unlock_bh(&sta->rate_ctrl_lock); 88 rcu_read_unlock(); 89 } 90 drv_sta_rc_update(local, sta->sdata, &sta->sta, changed); 91 } 92 93 int ieee80211_rate_control_register(const struct rate_control_ops *ops) 94 { 95 struct rate_control_alg *alg; 96 97 if (!ops->name) 98 return -EINVAL; 99 100 mutex_lock(&rate_ctrl_mutex); 101 list_for_each_entry(alg, &rate_ctrl_algs, list) { 102 if (!strcmp(alg->ops->name, ops->name)) { 103 /* don't register an algorithm twice */ 104 WARN_ON(1); 105 mutex_unlock(&rate_ctrl_mutex); 106 return -EALREADY; 107 } 108 } 109 110 alg = kzalloc(sizeof(*alg), GFP_KERNEL); 111 if (alg == NULL) { 112 mutex_unlock(&rate_ctrl_mutex); 113 return -ENOMEM; 114 } 115 alg->ops = ops; 116 117 list_add_tail(&alg->list, &rate_ctrl_algs); 118 mutex_unlock(&rate_ctrl_mutex); 119 120 return 0; 121 } 122 EXPORT_SYMBOL(ieee80211_rate_control_register); 123 124 void ieee80211_rate_control_unregister(const struct rate_control_ops *ops) 125 { 126 struct rate_control_alg *alg; 127 128 mutex_lock(&rate_ctrl_mutex); 129 list_for_each_entry(alg, &rate_ctrl_algs, list) { 130 if (alg->ops == ops) { 131 list_del(&alg->list); 132 kfree(alg); 133 break; 134 } 135 } 136 mutex_unlock(&rate_ctrl_mutex); 137 } 138 EXPORT_SYMBOL(ieee80211_rate_control_unregister); 139 140 static const struct rate_control_ops * 141 ieee80211_try_rate_control_ops_get(const char *name) 142 { 143 struct rate_control_alg *alg; 144 const struct rate_control_ops *ops = NULL; 145 146 if (!name) 147 return NULL; 148 149 mutex_lock(&rate_ctrl_mutex); 150 list_for_each_entry(alg, &rate_ctrl_algs, list) { 151 if (!strcmp(alg->ops->name, name)) { 152 ops = alg->ops; 153 break; 154 } 155 } 156 mutex_unlock(&rate_ctrl_mutex); 157 return ops; 158 } 159 160 /* Get the rate control algorithm. */ 161 static const struct rate_control_ops * 162 ieee80211_rate_control_ops_get(const char *name) 163 { 164 const struct rate_control_ops *ops; 165 const char *alg_name; 166 167 kernel_param_lock(THIS_MODULE); 168 if (!name) 169 alg_name = ieee80211_default_rc_algo; 170 else 171 alg_name = name; 172 173 ops = ieee80211_try_rate_control_ops_get(alg_name); 174 if (!ops && name) 175 /* try default if specific alg requested but not found */ 176 ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); 177 178 /* try built-in one if specific alg requested but not found */ 179 if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) 180 ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); 181 kernel_param_unlock(THIS_MODULE); 182 183 return ops; 184 } 185 186 #ifdef CONFIG_MAC80211_DEBUGFS 187 static ssize_t rcname_read(struct file *file, char __user *userbuf, 188 size_t count, loff_t *ppos) 189 { 190 struct rate_control_ref *ref = file->private_data; 191 int len = strlen(ref->ops->name); 192 193 return simple_read_from_buffer(userbuf, count, ppos, 194 ref->ops->name, len); 195 } 196 197 static const struct file_operations rcname_ops = { 198 .read = rcname_read, 199 .open = simple_open, 200 .llseek = default_llseek, 201 }; 202 #endif 203 204 static struct rate_control_ref *rate_control_alloc(const char *name, 205 struct ieee80211_local *local) 206 { 207 struct dentry *debugfsdir = NULL; 208 struct rate_control_ref *ref; 209 210 ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); 211 if (!ref) 212 return NULL; 213 ref->local = local; 214 ref->ops = ieee80211_rate_control_ops_get(name); 215 if (!ref->ops) 216 goto free; 217 218 #ifdef CONFIG_MAC80211_DEBUGFS 219 debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); 220 local->debugfs.rcdir = debugfsdir; 221 debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops); 222 #endif 223 224 ref->priv = ref->ops->alloc(&local->hw, debugfsdir); 225 if (!ref->priv) 226 goto free; 227 return ref; 228 229 free: 230 kfree(ref); 231 return NULL; 232 } 233 234 static void rate_control_free(struct rate_control_ref *ctrl_ref) 235 { 236 ctrl_ref->ops->free(ctrl_ref->priv); 237 238 #ifdef CONFIG_MAC80211_DEBUGFS 239 debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir); 240 ctrl_ref->local->debugfs.rcdir = NULL; 241 #endif 242 243 kfree(ctrl_ref); 244 } 245 246 static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc) 247 { 248 struct sk_buff *skb = txrc->skb; 249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 251 __le16 fc; 252 253 fc = hdr->frame_control; 254 255 return (info->flags & (IEEE80211_TX_CTL_NO_ACK | 256 IEEE80211_TX_CTL_USE_MINRATE)) || 257 !ieee80211_is_data(fc); 258 } 259 260 static void rc_send_low_basicrate(s8 *idx, u32 basic_rates, 261 struct ieee80211_supported_band *sband) 262 { 263 u8 i; 264 265 if (basic_rates == 0) 266 return; /* assume basic rates unknown and accept rate */ 267 if (*idx < 0) 268 return; 269 if (basic_rates & (1 << *idx)) 270 return; /* selected rate is a basic rate */ 271 272 for (i = *idx + 1; i <= sband->n_bitrates; i++) { 273 if (basic_rates & (1 << i)) { 274 *idx = i; 275 return; 276 } 277 } 278 279 /* could not find a basic rate; use original selection */ 280 } 281 282 static void __rate_control_send_low(struct ieee80211_hw *hw, 283 struct ieee80211_supported_band *sband, 284 struct ieee80211_sta *sta, 285 struct ieee80211_tx_info *info, 286 u32 rate_mask) 287 { 288 int i; 289 u32 rate_flags = 290 ieee80211_chandef_rate_flags(&hw->conf.chandef); 291 292 if ((sband->band == NL80211_BAND_2GHZ) && 293 (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) 294 rate_flags |= IEEE80211_RATE_ERP_G; 295 296 info->control.rates[0].idx = 0; 297 for (i = 0; i < sband->n_bitrates; i++) { 298 if (!(rate_mask & BIT(i))) 299 continue; 300 301 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 302 continue; 303 304 if (!rate_supported(sta, sband->band, i)) 305 continue; 306 307 info->control.rates[0].idx = i; 308 break; 309 } 310 WARN_ONCE(i == sband->n_bitrates, 311 "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n", 312 sta ? sta->supp_rates[sband->band] : -1, 313 rate_mask, rate_flags); 314 315 info->control.rates[0].count = 316 (info->flags & IEEE80211_TX_CTL_NO_ACK) ? 317 1 : hw->max_rate_tries; 318 319 info->control.skip_table = 1; 320 } 321 322 323 bool rate_control_send_low(struct ieee80211_sta *pubsta, 324 void *priv_sta, 325 struct ieee80211_tx_rate_control *txrc) 326 { 327 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 328 struct ieee80211_supported_band *sband = txrc->sband; 329 struct sta_info *sta; 330 int mcast_rate; 331 bool use_basicrate = false; 332 333 if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { 334 __rate_control_send_low(txrc->hw, sband, pubsta, info, 335 txrc->rate_idx_mask); 336 337 if (!pubsta && txrc->bss) { 338 mcast_rate = txrc->bss_conf->mcast_rate[sband->band]; 339 if (mcast_rate > 0) { 340 info->control.rates[0].idx = mcast_rate - 1; 341 return true; 342 } 343 use_basicrate = true; 344 } else if (pubsta) { 345 sta = container_of(pubsta, struct sta_info, sta); 346 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 347 use_basicrate = true; 348 } 349 350 if (use_basicrate) 351 rc_send_low_basicrate(&info->control.rates[0].idx, 352 txrc->bss_conf->basic_rates, 353 sband); 354 355 return true; 356 } 357 return false; 358 } 359 EXPORT_SYMBOL(rate_control_send_low); 360 361 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask) 362 { 363 int j; 364 365 /* See whether the selected rate or anything below it is allowed. */ 366 for (j = *rate_idx; j >= 0; j--) { 367 if (mask & (1 << j)) { 368 /* Okay, found a suitable rate. Use it. */ 369 *rate_idx = j; 370 return true; 371 } 372 } 373 374 /* Try to find a higher rate that would be allowed */ 375 for (j = *rate_idx + 1; j < n_bitrates; j++) { 376 if (mask & (1 << j)) { 377 /* Okay, found a suitable rate. Use it. */ 378 *rate_idx = j; 379 return true; 380 } 381 } 382 return false; 383 } 384 385 static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask) 386 { 387 int i, j; 388 int ridx, rbit; 389 390 ridx = *rate_idx / 8; 391 rbit = *rate_idx % 8; 392 393 /* sanity check */ 394 if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN) 395 return false; 396 397 /* See whether the selected rate or anything below it is allowed. */ 398 for (i = ridx; i >= 0; i--) { 399 for (j = rbit; j >= 0; j--) 400 if (mcs_mask[i] & BIT(j)) { 401 *rate_idx = i * 8 + j; 402 return true; 403 } 404 rbit = 7; 405 } 406 407 /* Try to find a higher rate that would be allowed */ 408 ridx = (*rate_idx + 1) / 8; 409 rbit = (*rate_idx + 1) % 8; 410 411 for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 412 for (j = rbit; j < 8; j++) 413 if (mcs_mask[i] & BIT(j)) { 414 *rate_idx = i * 8 + j; 415 return true; 416 } 417 rbit = 0; 418 } 419 return false; 420 } 421 422 static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask) 423 { 424 int i, j; 425 int ridx, rbit; 426 427 ridx = *rate_idx >> 4; 428 rbit = *rate_idx & 0xf; 429 430 if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX) 431 return false; 432 433 /* See whether the selected rate or anything below it is allowed. */ 434 for (i = ridx; i >= 0; i--) { 435 for (j = rbit; j >= 0; j--) { 436 if (vht_mask[i] & BIT(j)) { 437 *rate_idx = (i << 4) | j; 438 return true; 439 } 440 } 441 rbit = 15; 442 } 443 444 /* Try to find a higher rate that would be allowed */ 445 ridx = (*rate_idx + 1) >> 4; 446 rbit = (*rate_idx + 1) & 0xf; 447 448 for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) { 449 for (j = rbit; j < 16; j++) { 450 if (vht_mask[i] & BIT(j)) { 451 *rate_idx = (i << 4) | j; 452 return true; 453 } 454 } 455 rbit = 0; 456 } 457 return false; 458 } 459 460 static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags, 461 struct ieee80211_supported_band *sband, 462 enum nl80211_chan_width chan_width, 463 u32 mask, 464 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 465 u16 vht_mask[NL80211_VHT_NSS_MAX]) 466 { 467 if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) { 468 /* handle VHT rates */ 469 if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask)) 470 return; 471 472 *rate_idx = 0; 473 /* keep protection flags */ 474 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 475 IEEE80211_TX_RC_USE_CTS_PROTECT | 476 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 477 478 *rate_flags |= IEEE80211_TX_RC_MCS; 479 if (chan_width == NL80211_CHAN_WIDTH_40) 480 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 481 482 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 483 return; 484 485 /* also try the legacy rates. */ 486 *rate_flags &= ~(IEEE80211_TX_RC_MCS | 487 IEEE80211_TX_RC_40_MHZ_WIDTH); 488 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 489 mask)) 490 return; 491 } else if (*rate_flags & IEEE80211_TX_RC_MCS) { 492 /* handle HT rates */ 493 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 494 return; 495 496 /* also try the legacy rates. */ 497 *rate_idx = 0; 498 /* keep protection flags */ 499 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 500 IEEE80211_TX_RC_USE_CTS_PROTECT | 501 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 502 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 503 mask)) 504 return; 505 } else { 506 /* handle legacy rates */ 507 if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates, 508 mask)) 509 return; 510 511 /* if HT BSS, and we handle a data frame, also try HT rates */ 512 switch (chan_width) { 513 case NL80211_CHAN_WIDTH_20_NOHT: 514 case NL80211_CHAN_WIDTH_5: 515 case NL80211_CHAN_WIDTH_10: 516 return; 517 default: 518 break; 519 } 520 521 *rate_idx = 0; 522 /* keep protection flags */ 523 *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS | 524 IEEE80211_TX_RC_USE_CTS_PROTECT | 525 IEEE80211_TX_RC_USE_SHORT_PREAMBLE); 526 527 *rate_flags |= IEEE80211_TX_RC_MCS; 528 529 if (chan_width == NL80211_CHAN_WIDTH_40) 530 *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 531 532 if (rate_idx_match_mcs_mask(rate_idx, mcs_mask)) 533 return; 534 } 535 536 /* 537 * Uh.. No suitable rate exists. This should not really happen with 538 * sane TX rate mask configurations. However, should someone manage to 539 * configure supported rates and TX rate mask in incompatible way, 540 * allow the frame to be transmitted with whatever the rate control 541 * selected. 542 */ 543 } 544 545 static void rate_fixup_ratelist(struct ieee80211_vif *vif, 546 struct ieee80211_supported_band *sband, 547 struct ieee80211_tx_info *info, 548 struct ieee80211_tx_rate *rates, 549 int max_rates) 550 { 551 struct ieee80211_rate *rate; 552 bool inval = false; 553 int i; 554 555 /* 556 * Set up the RTS/CTS rate as the fastest basic rate 557 * that is not faster than the data rate unless there 558 * is no basic rate slower than the data rate, in which 559 * case we pick the slowest basic rate 560 * 561 * XXX: Should this check all retry rates? 562 */ 563 if (!(rates[0].flags & 564 (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) { 565 u32 basic_rates = vif->bss_conf.basic_rates; 566 s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0; 567 568 rate = &sband->bitrates[rates[0].idx]; 569 570 for (i = 0; i < sband->n_bitrates; i++) { 571 /* must be a basic rate */ 572 if (!(basic_rates & BIT(i))) 573 continue; 574 /* must not be faster than the data rate */ 575 if (sband->bitrates[i].bitrate > rate->bitrate) 576 continue; 577 /* maximum */ 578 if (sband->bitrates[baserate].bitrate < 579 sband->bitrates[i].bitrate) 580 baserate = i; 581 } 582 583 info->control.rts_cts_rate_idx = baserate; 584 } 585 586 for (i = 0; i < max_rates; i++) { 587 /* 588 * make sure there's no valid rate following 589 * an invalid one, just in case drivers don't 590 * take the API seriously to stop at -1. 591 */ 592 if (inval) { 593 rates[i].idx = -1; 594 continue; 595 } 596 if (rates[i].idx < 0) { 597 inval = true; 598 continue; 599 } 600 601 /* 602 * For now assume MCS is already set up correctly, this 603 * needs to be fixed. 604 */ 605 if (rates[i].flags & IEEE80211_TX_RC_MCS) { 606 WARN_ON(rates[i].idx > 76); 607 608 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 609 info->control.use_cts_prot) 610 rates[i].flags |= 611 IEEE80211_TX_RC_USE_CTS_PROTECT; 612 continue; 613 } 614 615 if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) { 616 WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9); 617 continue; 618 } 619 620 /* set up RTS protection if desired */ 621 if (info->control.use_rts) { 622 rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS; 623 info->control.use_cts_prot = false; 624 } 625 626 /* RC is busted */ 627 if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) { 628 rates[i].idx = -1; 629 continue; 630 } 631 632 rate = &sband->bitrates[rates[i].idx]; 633 634 /* set up short preamble */ 635 if (info->control.short_preamble && 636 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE) 637 rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE; 638 639 /* set up G protection */ 640 if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) && 641 info->control.use_cts_prot && 642 rate->flags & IEEE80211_RATE_ERP_G) 643 rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT; 644 } 645 } 646 647 648 static void rate_control_fill_sta_table(struct ieee80211_sta *sta, 649 struct ieee80211_tx_info *info, 650 struct ieee80211_tx_rate *rates, 651 int max_rates) 652 { 653 struct ieee80211_sta_rates *ratetbl = NULL; 654 int i; 655 656 if (sta && !info->control.skip_table) 657 ratetbl = rcu_dereference(sta->rates); 658 659 /* Fill remaining rate slots with data from the sta rate table. */ 660 max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE); 661 for (i = 0; i < max_rates; i++) { 662 if (i < ARRAY_SIZE(info->control.rates) && 663 info->control.rates[i].idx >= 0 && 664 info->control.rates[i].count) { 665 if (rates != info->control.rates) 666 rates[i] = info->control.rates[i]; 667 } else if (ratetbl) { 668 rates[i].idx = ratetbl->rate[i].idx; 669 rates[i].flags = ratetbl->rate[i].flags; 670 if (info->control.use_rts) 671 rates[i].count = ratetbl->rate[i].count_rts; 672 else if (info->control.use_cts_prot) 673 rates[i].count = ratetbl->rate[i].count_cts; 674 else 675 rates[i].count = ratetbl->rate[i].count; 676 } else { 677 rates[i].idx = -1; 678 rates[i].count = 0; 679 } 680 681 if (rates[i].idx < 0 || !rates[i].count) 682 break; 683 } 684 } 685 686 static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata, 687 struct ieee80211_supported_band *sband, 688 struct ieee80211_sta *sta, u32 *mask, 689 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN], 690 u16 vht_mask[NL80211_VHT_NSS_MAX]) 691 { 692 u32 i, flags; 693 694 *mask = sdata->rc_rateidx_mask[sband->band]; 695 flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef); 696 for (i = 0; i < sband->n_bitrates; i++) { 697 if ((flags & sband->bitrates[i].flags) != flags) 698 *mask &= ~BIT(i); 699 } 700 701 if (*mask == (1 << sband->n_bitrates) - 1 && 702 !sdata->rc_has_mcs_mask[sband->band] && 703 !sdata->rc_has_vht_mcs_mask[sband->band]) 704 return false; 705 706 if (sdata->rc_has_mcs_mask[sband->band]) 707 memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band], 708 IEEE80211_HT_MCS_MASK_LEN); 709 else 710 memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN); 711 712 if (sdata->rc_has_vht_mcs_mask[sband->band]) 713 memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band], 714 sizeof(u16) * NL80211_VHT_NSS_MAX); 715 else 716 memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX); 717 718 if (sta) { 719 __le16 sta_vht_cap; 720 u16 sta_vht_mask[NL80211_VHT_NSS_MAX]; 721 722 /* Filter out rates that the STA does not support */ 723 *mask &= sta->supp_rates[sband->band]; 724 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) 725 mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; 726 727 sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map; 728 ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask); 729 for (i = 0; i < NL80211_VHT_NSS_MAX; i++) 730 vht_mask[i] &= sta_vht_mask[i]; 731 } 732 733 return true; 734 } 735 736 static void 737 rate_control_apply_mask_ratetbl(struct sta_info *sta, 738 struct ieee80211_supported_band *sband, 739 struct ieee80211_sta_rates *rates) 740 { 741 int i; 742 u32 mask; 743 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 744 u16 vht_mask[NL80211_VHT_NSS_MAX]; 745 enum nl80211_chan_width chan_width; 746 747 if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask, 748 mcs_mask, vht_mask)) 749 return; 750 751 chan_width = sta->sdata->vif.bss_conf.chandef.width; 752 for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) { 753 if (rates->rate[i].idx < 0) 754 break; 755 756 rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags, 757 sband, chan_width, mask, mcs_mask, 758 vht_mask); 759 } 760 } 761 762 static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, 763 struct ieee80211_sta *sta, 764 struct ieee80211_supported_band *sband, 765 struct ieee80211_tx_rate *rates, 766 int max_rates) 767 { 768 enum nl80211_chan_width chan_width; 769 u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; 770 u32 mask; 771 u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX]; 772 int i; 773 774 /* 775 * Try to enforce the rateidx mask the user wanted. skip this if the 776 * default mask (allow all rates) is used to save some processing for 777 * the common case. 778 */ 779 if (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask, 780 vht_mask)) 781 return; 782 783 /* 784 * Make sure the rate index selected for each TX rate is 785 * included in the configured mask and change the rate indexes 786 * if needed. 787 */ 788 chan_width = sdata->vif.bss_conf.chandef.width; 789 for (i = 0; i < max_rates; i++) { 790 /* Skip invalid rates */ 791 if (rates[i].idx < 0) 792 break; 793 794 rate_flags = rates[i].flags; 795 rate_idx_match_mask(&rates[i].idx, &rate_flags, sband, 796 chan_width, mask, mcs_mask, vht_mask); 797 rates[i].flags = rate_flags; 798 } 799 } 800 801 void ieee80211_get_tx_rates(struct ieee80211_vif *vif, 802 struct ieee80211_sta *sta, 803 struct sk_buff *skb, 804 struct ieee80211_tx_rate *dest, 805 int max_rates) 806 { 807 struct ieee80211_sub_if_data *sdata; 808 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 809 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 810 struct ieee80211_supported_band *sband; 811 812 rate_control_fill_sta_table(sta, info, dest, max_rates); 813 814 if (!vif) 815 return; 816 817 sdata = vif_to_sdata(vif); 818 sband = sdata->local->hw.wiphy->bands[info->band]; 819 820 if (ieee80211_is_data(hdr->frame_control)) 821 rate_control_apply_mask(sdata, sta, sband, dest, max_rates); 822 823 if (dest[0].idx < 0) 824 __rate_control_send_low(&sdata->local->hw, sband, sta, info, 825 sdata->rc_rateidx_mask[info->band]); 826 827 if (sta) 828 rate_fixup_ratelist(vif, sband, info, dest, max_rates); 829 } 830 EXPORT_SYMBOL(ieee80211_get_tx_rates); 831 832 void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, 833 struct sta_info *sta, 834 struct ieee80211_tx_rate_control *txrc) 835 { 836 struct rate_control_ref *ref = sdata->local->rate_ctrl; 837 void *priv_sta = NULL; 838 struct ieee80211_sta *ista = NULL; 839 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); 840 int i; 841 842 if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) { 843 ista = &sta->sta; 844 priv_sta = sta->rate_ctrl_priv; 845 } 846 847 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 848 info->control.rates[i].idx = -1; 849 info->control.rates[i].flags = 0; 850 info->control.rates[i].count = 0; 851 } 852 853 if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL)) 854 return; 855 856 if (ista) { 857 spin_lock_bh(&sta->rate_ctrl_lock); 858 ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); 859 spin_unlock_bh(&sta->rate_ctrl_lock); 860 } else { 861 ref->ops->get_rate(ref->priv, NULL, NULL, txrc); 862 } 863 864 if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE)) 865 return; 866 867 ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb, 868 info->control.rates, 869 ARRAY_SIZE(info->control.rates)); 870 } 871 872 int rate_control_set_rates(struct ieee80211_hw *hw, 873 struct ieee80211_sta *pubsta, 874 struct ieee80211_sta_rates *rates) 875 { 876 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 877 struct ieee80211_sta_rates *old; 878 struct ieee80211_supported_band *sband; 879 880 sband = hw->wiphy->bands[ieee80211_get_sdata_band(sta->sdata)]; 881 rate_control_apply_mask_ratetbl(sta, sband, rates); 882 /* 883 * mac80211 guarantees that this function will not be called 884 * concurrently, so the following RCU access is safe, even without 885 * extra locking. This can not be checked easily, so we just set 886 * the condition to true. 887 */ 888 old = rcu_dereference_protected(pubsta->rates, true); 889 rcu_assign_pointer(pubsta->rates, rates); 890 if (old) 891 kfree_rcu(old, rcu_head); 892 893 drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta); 894 895 return 0; 896 } 897 EXPORT_SYMBOL(rate_control_set_rates); 898 899 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, 900 const char *name) 901 { 902 struct rate_control_ref *ref; 903 904 ASSERT_RTNL(); 905 906 if (local->open_count) 907 return -EBUSY; 908 909 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 910 if (WARN_ON(!local->ops->set_rts_threshold)) 911 return -EINVAL; 912 return 0; 913 } 914 915 ref = rate_control_alloc(name, local); 916 if (!ref) { 917 wiphy_warn(local->hw.wiphy, 918 "Failed to select rate control algorithm\n"); 919 return -ENOENT; 920 } 921 922 WARN_ON(local->rate_ctrl); 923 local->rate_ctrl = ref; 924 925 wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n", 926 ref->ops->name); 927 928 return 0; 929 } 930 931 void rate_control_deinitialize(struct ieee80211_local *local) 932 { 933 struct rate_control_ref *ref; 934 935 ref = local->rate_ctrl; 936 937 if (!ref) 938 return; 939 940 local->rate_ctrl = NULL; 941 rate_control_free(ref); 942 } 943 944