1 /*- 2 * Copyright (c) 2005 John Bicket 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer, 10 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 3. Neither the names of the above-listed copyright holders nor the names 16 * of any contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * Alternatively, this software may be distributed under the terms of the 20 * GNU General Public License ("GPL") version 2 as published by the Free 21 * Software Foundation. 22 * 23 * NO WARRANTY 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 28 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 29 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 32 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 34 * THE POSSIBILITY OF SUCH DAMAGES. 35 * 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * John Bicket's SampleRate control algorithm. 43 */ 44 #include "opt_ath.h" 45 #include "opt_inet.h" 46 #include "opt_wlan.h" 47 #include "opt_ah.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/mutex.h> 55 #include <sys/errno.h> 56 57 #include <machine/bus.h> 58 #include <machine/resource.h> 59 #include <sys/bus.h> 60 61 #include <sys/socket.h> 62 63 #include <net/if.h> 64 #include <net/if_media.h> 65 #include <net/if_arp.h> 66 #include <net/ethernet.h> /* XXX for ether_sprintf */ 67 68 #include <net80211/ieee80211_var.h> 69 70 #include <net/bpf.h> 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <netinet/if_ether.h> 75 #endif 76 77 #include <dev/ath/if_athvar.h> 78 #include <dev/ath/ath_rate/sample/sample.h> 79 #include <dev/ath/ath_hal/ah_desc.h> 80 #include <dev/ath/ath_rate/sample/tx_schedules.h> 81 82 /* 83 * This file is an implementation of the SampleRate algorithm 84 * in "Bit-rate Selection in Wireless Networks" 85 * (http://www.pdos.lcs.mit.edu/papers/jbicket-ms.ps) 86 * 87 * SampleRate chooses the bit-rate it predicts will provide the most 88 * throughput based on estimates of the expected per-packet 89 * transmission time for each bit-rate. SampleRate periodically sends 90 * packets at bit-rates other than the current one to estimate when 91 * another bit-rate will provide better performance. SampleRate 92 * switches to another bit-rate when its estimated per-packet 93 * transmission time becomes smaller than the current bit-rate's. 94 * SampleRate reduces the number of bit-rates it must sample by 95 * eliminating those that could not perform better than the one 96 * currently being used. SampleRate also stops probing at a bit-rate 97 * if it experiences several successive losses. 98 * 99 * The difference between the algorithm in the thesis and the one in this 100 * file is that the one in this file uses a ewma instead of a window. 101 * 102 * Also, this implementation tracks the average transmission time for 103 * a few different packet sizes independently for each link. 104 */ 105 106 static void ath_rate_ctl_reset(struct ath_softc *, struct ieee80211_node *); 107 108 static __inline int 109 size_to_bin(int size) 110 { 111 #if NUM_PACKET_SIZE_BINS > 1 112 if (size <= packet_size_bins[0]) 113 return 0; 114 #endif 115 #if NUM_PACKET_SIZE_BINS > 2 116 if (size <= packet_size_bins[1]) 117 return 1; 118 #endif 119 #if NUM_PACKET_SIZE_BINS > 3 120 if (size <= packet_size_bins[2]) 121 return 2; 122 #endif 123 #if NUM_PACKET_SIZE_BINS > 4 124 #error "add support for more packet sizes" 125 #endif 126 return NUM_PACKET_SIZE_BINS-1; 127 } 128 129 void 130 ath_rate_node_init(struct ath_softc *sc, struct ath_node *an) 131 { 132 /* NB: assumed to be zero'd by caller */ 133 } 134 135 void 136 ath_rate_node_cleanup(struct ath_softc *sc, struct ath_node *an) 137 { 138 } 139 140 static int 141 dot11rate(const HAL_RATE_TABLE *rt, int rix) 142 { 143 if (rix < 0) 144 return -1; 145 return rt->info[rix].phy == IEEE80211_T_HT ? 146 rt->info[rix].dot11Rate : (rt->info[rix].dot11Rate & IEEE80211_RATE_VAL) / 2; 147 } 148 149 static const char * 150 dot11rate_label(const HAL_RATE_TABLE *rt, int rix) 151 { 152 if (rix < 0) 153 return ""; 154 return rt->info[rix].phy == IEEE80211_T_HT ? "MCS" : "Mb "; 155 } 156 157 /* 158 * Return the rix with the lowest average_tx_time, 159 * or -1 if all the average_tx_times are 0. 160 */ 161 static __inline int 162 pick_best_rate(struct ath_node *an, const HAL_RATE_TABLE *rt, 163 int size_bin, int require_acked_before) 164 { 165 struct sample_node *sn = ATH_NODE_SAMPLE(an); 166 int best_rate_rix, best_rate_tt, best_rate_pct; 167 uint64_t mask; 168 int rix, tt, pct; 169 170 best_rate_rix = 0; 171 best_rate_tt = 0; 172 best_rate_pct = 0; 173 for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) { 174 if ((mask & 1) == 0) /* not a supported rate */ 175 continue; 176 177 /* Don't pick a non-HT rate for a HT node */ 178 if ((an->an_node.ni_flags & IEEE80211_NODE_HT) && 179 (rt->info[rix].phy != IEEE80211_T_HT)) { 180 continue; 181 } 182 183 tt = sn->stats[size_bin][rix].average_tx_time; 184 if (tt <= 0 || 185 (require_acked_before && 186 !sn->stats[size_bin][rix].packets_acked)) 187 continue; 188 189 /* Calculate percentage if possible */ 190 if (sn->stats[size_bin][rix].total_packets > 0) { 191 pct = sn->stats[size_bin][rix].ewma_pct; 192 } else { 193 /* XXX for now, assume 95% ok */ 194 pct = 95; 195 } 196 197 /* don't use a bit-rate that has been failing */ 198 if (sn->stats[size_bin][rix].successive_failures > 3) 199 continue; 200 201 /* 202 * For HT, Don't use a bit rate that is much more 203 * lossy than the best. 204 * 205 * XXX this isn't optimal; it's just designed to 206 * eliminate rates that are going to be obviously 207 * worse. 208 */ 209 if (an->an_node.ni_flags & IEEE80211_NODE_HT) { 210 if (best_rate_pct > (pct + 50)) 211 continue; 212 } 213 214 /* 215 * For non-MCS rates, use the current average txtime for 216 * comparison. 217 */ 218 if (! (an->an_node.ni_flags & IEEE80211_NODE_HT)) { 219 if (best_rate_tt == 0 || tt <= best_rate_tt) { 220 best_rate_tt = tt; 221 best_rate_rix = rix; 222 best_rate_pct = pct; 223 } 224 } 225 226 /* 227 * Since 2 stream rates have slightly higher TX times, 228 * allow a little bit of leeway. This should later 229 * be abstracted out and properly handled. 230 */ 231 if (an->an_node.ni_flags & IEEE80211_NODE_HT) { 232 if (best_rate_tt == 0 || (tt * 8 <= best_rate_tt * 10)) { 233 best_rate_tt = tt; 234 best_rate_rix = rix; 235 best_rate_pct = pct; 236 } 237 } 238 } 239 return (best_rate_tt ? best_rate_rix : -1); 240 } 241 242 /* 243 * Pick a good "random" bit-rate to sample other than the current one. 244 */ 245 static __inline int 246 pick_sample_rate(struct sample_softc *ssc , struct ath_node *an, 247 const HAL_RATE_TABLE *rt, int size_bin) 248 { 249 #define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL) 250 #define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS) 251 struct sample_node *sn = ATH_NODE_SAMPLE(an); 252 int current_rix, rix; 253 unsigned current_tt; 254 uint64_t mask; 255 256 current_rix = sn->current_rix[size_bin]; 257 if (current_rix < 0) { 258 /* no successes yet, send at the lowest bit-rate */ 259 /* XXX should return MCS0 if HT */ 260 return 0; 261 } 262 263 current_tt = sn->stats[size_bin][current_rix].average_tx_time; 264 265 rix = sn->last_sample_rix[size_bin]+1; /* next sample rate */ 266 mask = sn->ratemask &~ ((uint64_t) 1<<current_rix);/* don't sample current rate */ 267 while (mask != 0) { 268 if ((mask & ((uint64_t) 1<<rix)) == 0) { /* not a supported rate */ 269 nextrate: 270 if (++rix >= rt->rateCount) 271 rix = 0; 272 continue; 273 } 274 275 /* if the node is HT and the rate isn't HT, don't bother sample */ 276 if ((an->an_node.ni_flags & IEEE80211_NODE_HT) && 277 (rt->info[rix].phy != IEEE80211_T_HT)) { 278 mask &= ~((uint64_t) 1<<rix); 279 goto nextrate; 280 } 281 282 /* this bit-rate is always worse than the current one */ 283 if (sn->stats[size_bin][rix].perfect_tx_time > current_tt) { 284 mask &= ~((uint64_t) 1<<rix); 285 goto nextrate; 286 } 287 288 /* rarely sample bit-rates that fail a lot */ 289 if (sn->stats[size_bin][rix].successive_failures > ssc->max_successive_failures && 290 ticks - sn->stats[size_bin][rix].last_tx < ssc->stale_failure_timeout) { 291 mask &= ~((uint64_t) 1<<rix); 292 goto nextrate; 293 } 294 295 /* 296 * When doing aggregation, successive failures don't happen 297 * as often, as sometimes some of the sub-frames get through. 298 * 299 * If the sample rix average tx time is greater than the 300 * average tx time of the current rix, don't immediately use 301 * the rate for sampling. 302 */ 303 if (an->an_node.ni_flags & IEEE80211_NODE_HT) { 304 if ((sn->stats[size_bin][rix].average_tx_time * 10 > 305 sn->stats[size_bin][current_rix].average_tx_time * 9) && 306 (ticks - sn->stats[size_bin][rix].last_tx < ssc->stale_failure_timeout)) { 307 mask &= ~((uint64_t) 1<<rix); 308 goto nextrate; 309 } 310 } 311 312 /* 313 * XXX TODO 314 * For HT, limit sample somehow? 315 */ 316 317 /* Don't sample more than 2 rates higher for rates > 11M for non-HT rates */ 318 if (! (an->an_node.ni_flags & IEEE80211_NODE_HT)) { 319 if (DOT11RATE(rix) > 2*11 && rix > current_rix + 2) { 320 mask &= ~((uint64_t) 1<<rix); 321 goto nextrate; 322 } 323 } 324 325 sn->last_sample_rix[size_bin] = rix; 326 return rix; 327 } 328 return current_rix; 329 #undef DOT11RATE 330 #undef MCS 331 } 332 333 static int 334 ath_rate_get_static_rix(struct ath_softc *sc, const struct ieee80211_node *ni) 335 { 336 #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL) 337 #define DOT11RATE(_ix) (rt->info[(_ix)].dot11Rate & IEEE80211_RATE_VAL) 338 #define MCS(_ix) (ni->ni_htrates.rs_rates[_ix] | IEEE80211_RATE_MCS) 339 const struct ieee80211_txparam *tp = ni->ni_txparms; 340 int srate; 341 342 /* Check MCS rates */ 343 for (srate = ni->ni_htrates.rs_nrates - 1; srate >= 0; srate--) { 344 if (MCS(srate) == tp->ucastrate) 345 return sc->sc_rixmap[tp->ucastrate]; 346 } 347 348 /* Check legacy rates */ 349 for (srate = ni->ni_rates.rs_nrates - 1; srate >= 0; srate--) { 350 if (RATE(srate) == tp->ucastrate) 351 return sc->sc_rixmap[tp->ucastrate]; 352 } 353 return -1; 354 #undef RATE 355 #undef DOT11RATE 356 #undef MCS 357 } 358 359 static void 360 ath_rate_update_static_rix(struct ath_softc *sc, struct ieee80211_node *ni) 361 { 362 struct ath_node *an = ATH_NODE(ni); 363 const struct ieee80211_txparam *tp = ni->ni_txparms; 364 struct sample_node *sn = ATH_NODE_SAMPLE(an); 365 366 if (tp != NULL && tp->ucastrate != IEEE80211_FIXED_RATE_NONE) { 367 /* 368 * A fixed rate is to be used; ucastrate is the IEEE code 369 * for this rate (sans basic bit). Check this against the 370 * negotiated rate set for the node. Note the fixed rate 371 * may not be available for various reasons so we only 372 * setup the static rate index if the lookup is successful. 373 */ 374 sn->static_rix = ath_rate_get_static_rix(sc, ni); 375 } else { 376 sn->static_rix = -1; 377 } 378 } 379 380 /* 381 * Pick a non-HT rate to begin using. 382 */ 383 static int 384 ath_rate_pick_seed_rate_legacy(struct ath_softc *sc, struct ath_node *an, 385 int frameLen) 386 { 387 #define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL) 388 #define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS) 389 #define RATE(ix) (DOT11RATE(ix) / 2) 390 int rix = -1; 391 const HAL_RATE_TABLE *rt = sc->sc_currates; 392 struct sample_node *sn = ATH_NODE_SAMPLE(an); 393 const int size_bin = size_to_bin(frameLen); 394 395 /* no packet has been sent successfully yet */ 396 for (rix = rt->rateCount-1; rix > 0; rix--) { 397 if ((sn->ratemask & ((uint64_t) 1<<rix)) == 0) 398 continue; 399 400 /* Skip HT rates */ 401 if (rt->info[rix].phy == IEEE80211_T_HT) 402 continue; 403 404 /* 405 * Pick the highest rate <= 36 Mbps 406 * that hasn't failed. 407 */ 408 if (DOT11RATE(rix) <= 72 && 409 sn->stats[size_bin][rix].successive_failures == 0) { 410 break; 411 } 412 } 413 return rix; 414 #undef RATE 415 #undef MCS 416 #undef DOT11RATE 417 } 418 419 /* 420 * Pick a HT rate to begin using. 421 * 422 * Don't use any non-HT rates; only consider HT rates. 423 */ 424 static int 425 ath_rate_pick_seed_rate_ht(struct ath_softc *sc, struct ath_node *an, 426 int frameLen) 427 { 428 #define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL) 429 #define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS) 430 #define RATE(ix) (DOT11RATE(ix) / 2) 431 int rix = -1, ht_rix = -1; 432 const HAL_RATE_TABLE *rt = sc->sc_currates; 433 struct sample_node *sn = ATH_NODE_SAMPLE(an); 434 const int size_bin = size_to_bin(frameLen); 435 436 /* no packet has been sent successfully yet */ 437 for (rix = rt->rateCount-1; rix > 0; rix--) { 438 /* Skip rates we can't use */ 439 if ((sn->ratemask & ((uint64_t) 1<<rix)) == 0) 440 continue; 441 442 /* Keep a copy of the last seen HT rate index */ 443 if (rt->info[rix].phy == IEEE80211_T_HT) 444 ht_rix = rix; 445 446 /* Skip non-HT rates */ 447 if (rt->info[rix].phy != IEEE80211_T_HT) 448 continue; 449 450 /* 451 * Pick a medium-speed rate regardless of stream count 452 * which has not seen any failures. Higher rates may fail; 453 * we'll try them later. 454 */ 455 if (((MCS(rix) & 0x7) <= 4) && 456 sn->stats[size_bin][rix].successive_failures == 0) { 457 break; 458 } 459 } 460 461 /* 462 * If all the MCS rates have successive failures, rix should be 463 * > 0; otherwise use the lowest MCS rix (hopefully MCS 0.) 464 */ 465 return MAX(rix, ht_rix); 466 #undef RATE 467 #undef MCS 468 #undef DOT11RATE 469 } 470 471 472 void 473 ath_rate_findrate(struct ath_softc *sc, struct ath_node *an, 474 int shortPreamble, size_t frameLen, 475 u_int8_t *rix0, int *try0, u_int8_t *txrate) 476 { 477 #define DOT11RATE(ix) (rt->info[ix].dot11Rate & IEEE80211_RATE_VAL) 478 #define MCS(ix) (rt->info[ix].dot11Rate | IEEE80211_RATE_MCS) 479 #define RATE(ix) (DOT11RATE(ix) / 2) 480 struct sample_node *sn = ATH_NODE_SAMPLE(an); 481 struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc); 482 struct ifnet *ifp = sc->sc_ifp; 483 struct ieee80211com *ic = ifp->if_l2com; 484 const HAL_RATE_TABLE *rt = sc->sc_currates; 485 const int size_bin = size_to_bin(frameLen); 486 int rix, mrr, best_rix, change_rates; 487 unsigned average_tx_time; 488 489 ath_rate_update_static_rix(sc, &an->an_node); 490 491 if (sn->currates != sc->sc_currates) { 492 device_printf(sc->sc_dev, "%s: currates != sc_currates!\n", 493 __func__); 494 rix = 0; 495 *try0 = ATH_TXMAXTRY; 496 goto done; 497 } 498 499 if (sn->static_rix != -1) { 500 rix = sn->static_rix; 501 *try0 = ATH_TXMAXTRY; 502 goto done; 503 } 504 505 mrr = sc->sc_mrretry; 506 /* XXX check HT protmode too */ 507 if (mrr && (ic->ic_flags & IEEE80211_F_USEPROT && !sc->sc_mrrprot)) 508 mrr = 0; 509 510 best_rix = pick_best_rate(an, rt, size_bin, !mrr); 511 if (best_rix >= 0) { 512 average_tx_time = sn->stats[size_bin][best_rix].average_tx_time; 513 } else { 514 average_tx_time = 0; 515 } 516 /* 517 * Limit the time measuring the performance of other tx 518 * rates to sample_rate% of the total transmission time. 519 */ 520 if (sn->sample_tt[size_bin] < average_tx_time * (sn->packets_since_sample[size_bin]*ssc->sample_rate/100)) { 521 rix = pick_sample_rate(ssc, an, rt, size_bin); 522 IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL, 523 &an->an_node, "att %d sample_tt %d size %u sample rate %d %s current rate %d %s", 524 average_tx_time, 525 sn->sample_tt[size_bin], 526 bin_to_size(size_bin), 527 dot11rate(rt, rix), 528 dot11rate_label(rt, rix), 529 dot11rate(rt, sn->current_rix[size_bin]), 530 dot11rate_label(rt, sn->current_rix[size_bin])); 531 if (rix != sn->current_rix[size_bin]) { 532 sn->current_sample_rix[size_bin] = rix; 533 } else { 534 sn->current_sample_rix[size_bin] = -1; 535 } 536 sn->packets_since_sample[size_bin] = 0; 537 } else { 538 change_rates = 0; 539 if (!sn->packets_sent[size_bin] || best_rix == -1) { 540 /* no packet has been sent successfully yet */ 541 change_rates = 1; 542 if (an->an_node.ni_flags & IEEE80211_NODE_HT) 543 best_rix = 544 ath_rate_pick_seed_rate_ht(sc, an, frameLen); 545 else 546 best_rix = 547 ath_rate_pick_seed_rate_legacy(sc, an, frameLen); 548 } else if (sn->packets_sent[size_bin] < 20) { 549 /* let the bit-rate switch quickly during the first few packets */ 550 IEEE80211_NOTE(an->an_node.ni_vap, 551 IEEE80211_MSG_RATECTL, &an->an_node, 552 "%s: switching quickly..", __func__); 553 change_rates = 1; 554 } else if (ticks - ssc->min_switch > sn->ticks_since_switch[size_bin]) { 555 /* min_switch seconds have gone by */ 556 IEEE80211_NOTE(an->an_node.ni_vap, 557 IEEE80211_MSG_RATECTL, &an->an_node, 558 "%s: min_switch %d > ticks_since_switch %d..", 559 __func__, ticks - ssc->min_switch, sn->ticks_since_switch[size_bin]); 560 change_rates = 1; 561 } else if ((! (an->an_node.ni_flags & IEEE80211_NODE_HT)) && 562 (2*average_tx_time < sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time)) { 563 /* the current bit-rate is twice as slow as the best one */ 564 IEEE80211_NOTE(an->an_node.ni_vap, 565 IEEE80211_MSG_RATECTL, &an->an_node, 566 "%s: 2x att (= %d) < cur_rix att %d", 567 __func__, 568 2 * average_tx_time, sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time); 569 change_rates = 1; 570 } else if ((an->an_node.ni_flags & IEEE80211_NODE_HT)) { 571 int cur_rix = sn->current_rix[size_bin]; 572 int cur_att = sn->stats[size_bin][cur_rix].average_tx_time; 573 /* 574 * If the node is HT, upgrade it if the MCS rate is 575 * higher and the average tx time is within 20% of 576 * the current rate. It can fail a little. 577 * 578 * This is likely not optimal! 579 */ 580 #if 0 581 printf("cur rix/att %x/%d, best rix/att %x/%d\n", 582 MCS(cur_rix), cur_att, MCS(best_rix), average_tx_time); 583 #endif 584 if ((MCS(best_rix) > MCS(cur_rix)) && 585 (average_tx_time * 8) <= (cur_att * 10)) { 586 IEEE80211_NOTE(an->an_node.ni_vap, 587 IEEE80211_MSG_RATECTL, &an->an_node, 588 "%s: HT: best_rix 0x%d > cur_rix 0x%x, average_tx_time %d, cur_att %d", 589 __func__, 590 MCS(best_rix), MCS(cur_rix), average_tx_time, cur_att); 591 change_rates = 1; 592 } 593 } 594 595 sn->packets_since_sample[size_bin]++; 596 597 if (change_rates) { 598 if (best_rix != sn->current_rix[size_bin]) { 599 IEEE80211_NOTE(an->an_node.ni_vap, 600 IEEE80211_MSG_RATECTL, 601 &an->an_node, 602 "%s: size %d switch rate %d (%d/%d) -> %d (%d/%d) after %d packets mrr %d", 603 __func__, 604 bin_to_size(size_bin), 605 RATE(sn->current_rix[size_bin]), 606 sn->stats[size_bin][sn->current_rix[size_bin]].average_tx_time, 607 sn->stats[size_bin][sn->current_rix[size_bin]].perfect_tx_time, 608 RATE(best_rix), 609 sn->stats[size_bin][best_rix].average_tx_time, 610 sn->stats[size_bin][best_rix].perfect_tx_time, 611 sn->packets_since_switch[size_bin], 612 mrr); 613 } 614 sn->packets_since_switch[size_bin] = 0; 615 sn->current_rix[size_bin] = best_rix; 616 sn->ticks_since_switch[size_bin] = ticks; 617 /* 618 * Set the visible txrate for this node. 619 */ 620 an->an_node.ni_txrate = (rt->info[best_rix].phy == IEEE80211_T_HT) ? MCS(best_rix) : DOT11RATE(best_rix); 621 } 622 rix = sn->current_rix[size_bin]; 623 sn->packets_since_switch[size_bin]++; 624 } 625 *try0 = mrr ? sn->sched[rix].t0 : ATH_TXMAXTRY; 626 done: 627 628 /* 629 * This bug totally sucks and should be fixed. 630 * 631 * For now though, let's not panic, so we can start to figure 632 * out how to better reproduce it. 633 */ 634 if (rix < 0 || rix >= rt->rateCount) { 635 printf("%s: ERROR: rix %d out of bounds (rateCount=%d)\n", 636 __func__, 637 rix, 638 rt->rateCount); 639 rix = 0; /* XXX just default for now */ 640 } 641 KASSERT(rix >= 0 && rix < rt->rateCount, ("rix is %d", rix)); 642 643 *rix0 = rix; 644 *txrate = rt->info[rix].rateCode 645 | (shortPreamble ? rt->info[rix].shortPreamble : 0); 646 sn->packets_sent[size_bin]++; 647 #undef DOT11RATE 648 #undef MCS 649 #undef RATE 650 } 651 652 /* 653 * Get the TX rates. Don't fiddle with short preamble flags for them; 654 * the caller can do that. 655 */ 656 void 657 ath_rate_getxtxrates(struct ath_softc *sc, struct ath_node *an, 658 uint8_t rix0, struct ath_rc_series *rc) 659 { 660 struct sample_node *sn = ATH_NODE_SAMPLE(an); 661 const struct txschedule *sched = &sn->sched[rix0]; 662 663 KASSERT(rix0 == sched->r0, ("rix0 (%x) != sched->r0 (%x)!\n", 664 rix0, sched->r0)); 665 666 rc[0].flags = rc[1].flags = rc[2].flags = rc[3].flags = 0; 667 668 rc[0].rix = sched->r0; 669 rc[1].rix = sched->r1; 670 rc[2].rix = sched->r2; 671 rc[3].rix = sched->r3; 672 673 rc[0].tries = sched->t0; 674 rc[1].tries = sched->t1; 675 rc[2].tries = sched->t2; 676 rc[3].tries = sched->t3; 677 } 678 679 void 680 ath_rate_setupxtxdesc(struct ath_softc *sc, struct ath_node *an, 681 struct ath_desc *ds, int shortPreamble, u_int8_t rix) 682 { 683 struct sample_node *sn = ATH_NODE_SAMPLE(an); 684 const struct txschedule *sched = &sn->sched[rix]; 685 const HAL_RATE_TABLE *rt = sc->sc_currates; 686 uint8_t rix1, s1code, rix2, s2code, rix3, s3code; 687 688 /* XXX precalculate short preamble tables */ 689 rix1 = sched->r1; 690 s1code = rt->info[rix1].rateCode 691 | (shortPreamble ? rt->info[rix1].shortPreamble : 0); 692 rix2 = sched->r2; 693 s2code = rt->info[rix2].rateCode 694 | (shortPreamble ? rt->info[rix2].shortPreamble : 0); 695 rix3 = sched->r3; 696 s3code = rt->info[rix3].rateCode 697 | (shortPreamble ? rt->info[rix3].shortPreamble : 0); 698 ath_hal_setupxtxdesc(sc->sc_ah, ds, 699 s1code, sched->t1, /* series 1 */ 700 s2code, sched->t2, /* series 2 */ 701 s3code, sched->t3); /* series 3 */ 702 } 703 704 /* 705 * Update the EWMA percentage. 706 * 707 * This is a simple hack to track an EWMA based on the current 708 * rate scenario. For the rate codes which failed, this will 709 * record a 0% against it. For the rate code which succeeded, 710 * EWMA will record the nbad*100/nframes percentage against it. 711 */ 712 static void 713 update_ewma_stats(struct ath_softc *sc, struct ath_node *an, 714 int frame_size, 715 int rix0, int tries0, 716 int rix1, int tries1, 717 int rix2, int tries2, 718 int rix3, int tries3, 719 int short_tries, int tries, int status, 720 int nframes, int nbad) 721 { 722 struct sample_node *sn = ATH_NODE_SAMPLE(an); 723 struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc); 724 const int size_bin = size_to_bin(frame_size); 725 int tries_so_far; 726 int pct; 727 int rix = rix0; 728 729 /* Calculate percentage based on current rate */ 730 if (nframes == 0) 731 nframes = nbad = 1; 732 pct = ((nframes - nbad) * 1000) / nframes; 733 734 /* Figure out which rate index succeeded */ 735 tries_so_far = tries0; 736 737 if (tries1 && tries_so_far < tries) { 738 tries_so_far += tries1; 739 rix = rix1; 740 /* XXX bump ewma pct */ 741 } 742 743 if (tries2 && tries_so_far < tries) { 744 tries_so_far += tries2; 745 rix = rix2; 746 /* XXX bump ewma pct */ 747 } 748 749 if (tries3 && tries_so_far < tries) { 750 rix = rix3; 751 /* XXX bump ewma pct */ 752 } 753 754 /* rix is the successful rate, update EWMA for final rix */ 755 if (sn->stats[size_bin][rix].total_packets < 756 ssc->smoothing_minpackets) { 757 /* just average the first few packets */ 758 int a_pct = (sn->stats[size_bin][rix].packets_acked * 1000) / 759 (sn->stats[size_bin][rix].total_packets); 760 sn->stats[size_bin][rix].ewma_pct = a_pct; 761 } else { 762 /* use a ewma */ 763 sn->stats[size_bin][rix].ewma_pct = 764 ((sn->stats[size_bin][rix].ewma_pct * ssc->smoothing_rate) + 765 (pct * (100 - ssc->smoothing_rate))) / 100; 766 } 767 } 768 769 static void 770 update_stats(struct ath_softc *sc, struct ath_node *an, 771 int frame_size, 772 int rix0, int tries0, 773 int rix1, int tries1, 774 int rix2, int tries2, 775 int rix3, int tries3, 776 int short_tries, int tries, int status, 777 int nframes, int nbad) 778 { 779 struct sample_node *sn = ATH_NODE_SAMPLE(an); 780 struct sample_softc *ssc = ATH_SOFTC_SAMPLE(sc); 781 #ifdef IEEE80211_DEBUG 782 const HAL_RATE_TABLE *rt = sc->sc_currates; 783 #endif 784 const int size_bin = size_to_bin(frame_size); 785 const int size = bin_to_size(size_bin); 786 int tt, tries_so_far; 787 int is_ht40 = (an->an_node.ni_chw == 40); 788 789 if (!IS_RATE_DEFINED(sn, rix0)) 790 return; 791 tt = calc_usecs_unicast_packet(sc, size, rix0, short_tries, 792 MIN(tries0, tries) - 1, is_ht40); 793 tries_so_far = tries0; 794 795 if (tries1 && tries_so_far < tries) { 796 if (!IS_RATE_DEFINED(sn, rix1)) 797 return; 798 tt += calc_usecs_unicast_packet(sc, size, rix1, short_tries, 799 MIN(tries1 + tries_so_far, tries) - tries_so_far - 1, is_ht40); 800 tries_so_far += tries1; 801 } 802 803 if (tries2 && tries_so_far < tries) { 804 if (!IS_RATE_DEFINED(sn, rix2)) 805 return; 806 tt += calc_usecs_unicast_packet(sc, size, rix2, short_tries, 807 MIN(tries2 + tries_so_far, tries) - tries_so_far - 1, is_ht40); 808 tries_so_far += tries2; 809 } 810 811 if (tries3 && tries_so_far < tries) { 812 if (!IS_RATE_DEFINED(sn, rix3)) 813 return; 814 tt += calc_usecs_unicast_packet(sc, size, rix3, short_tries, 815 MIN(tries3 + tries_so_far, tries) - tries_so_far - 1, is_ht40); 816 } 817 818 if (sn->stats[size_bin][rix0].total_packets < ssc->smoothing_minpackets) { 819 /* just average the first few packets */ 820 int avg_tx = sn->stats[size_bin][rix0].average_tx_time; 821 int packets = sn->stats[size_bin][rix0].total_packets; 822 sn->stats[size_bin][rix0].average_tx_time = (tt+(avg_tx*packets))/(packets+nframes); 823 } else { 824 /* use a ewma */ 825 sn->stats[size_bin][rix0].average_tx_time = 826 ((sn->stats[size_bin][rix0].average_tx_time * ssc->smoothing_rate) + 827 (tt * (100 - ssc->smoothing_rate))) / 100; 828 } 829 830 /* 831 * XXX Don't mark the higher bit rates as also having failed; as this 832 * unfortunately stops those rates from being tasted when trying to 833 * TX. This happens with 11n aggregation. 834 */ 835 if (nframes == nbad) { 836 #if 0 837 int y; 838 #endif 839 sn->stats[size_bin][rix0].successive_failures += nbad; 840 #if 0 841 for (y = size_bin+1; y < NUM_PACKET_SIZE_BINS; y++) { 842 /* 843 * Also say larger packets failed since we 844 * assume if a small packet fails at a 845 * bit-rate then a larger one will also. 846 */ 847 sn->stats[y][rix0].successive_failures += nbad; 848 sn->stats[y][rix0].last_tx = ticks; 849 sn->stats[y][rix0].tries += tries; 850 sn->stats[y][rix0].total_packets += nframes; 851 } 852 #endif 853 } else { 854 sn->stats[size_bin][rix0].packets_acked += (nframes - nbad); 855 sn->stats[size_bin][rix0].successive_failures = 0; 856 } 857 sn->stats[size_bin][rix0].tries += tries; 858 sn->stats[size_bin][rix0].last_tx = ticks; 859 sn->stats[size_bin][rix0].total_packets += nframes; 860 861 if (rix0 == sn->current_sample_rix[size_bin]) { 862 IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL, 863 &an->an_node, 864 "%s: size %d %s sample rate %d %s tries (%d/%d) tt %d avg_tt (%d/%d) nfrm %d nbad %d", 865 __func__, 866 size, 867 status ? "FAIL" : "OK", 868 dot11rate(rt, rix0), 869 dot11rate_label(rt, rix0), 870 short_tries, tries, tt, 871 sn->stats[size_bin][rix0].average_tx_time, 872 sn->stats[size_bin][rix0].perfect_tx_time, 873 nframes, nbad); 874 sn->sample_tt[size_bin] = tt; 875 sn->current_sample_rix[size_bin] = -1; 876 } 877 } 878 879 static void 880 badrate(struct ifnet *ifp, int series, int hwrate, int tries, int status) 881 { 882 if_printf(ifp, "bad series%d hwrate 0x%x, tries %u ts_status 0x%x\n", 883 series, hwrate, tries, status); 884 } 885 886 void 887 ath_rate_tx_complete(struct ath_softc *sc, struct ath_node *an, 888 const struct ath_rc_series *rc, const struct ath_tx_status *ts, 889 int frame_size, int nframes, int nbad) 890 { 891 struct ifnet *ifp = sc->sc_ifp; 892 struct ieee80211com *ic = ifp->if_l2com; 893 struct sample_node *sn = ATH_NODE_SAMPLE(an); 894 int final_rix, short_tries, long_tries; 895 const HAL_RATE_TABLE *rt = sc->sc_currates; 896 int status = ts->ts_status; 897 int mrr; 898 899 final_rix = rt->rateCodeToIndex[ts->ts_rate]; 900 short_tries = ts->ts_shortretry; 901 long_tries = ts->ts_longretry + 1; 902 903 if (frame_size == 0) /* NB: should not happen */ 904 frame_size = 1500; 905 906 if (sn->ratemask == 0) { 907 IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL, 908 &an->an_node, 909 "%s: size %d %s rate/try %d/%d no rates yet", 910 __func__, 911 bin_to_size(size_to_bin(frame_size)), 912 status ? "FAIL" : "OK", 913 short_tries, long_tries); 914 return; 915 } 916 mrr = sc->sc_mrretry; 917 /* XXX check HT protmode too */ 918 if (mrr && (ic->ic_flags & IEEE80211_F_USEPROT && !sc->sc_mrrprot)) 919 mrr = 0; 920 921 if (!mrr || ts->ts_finaltsi == 0) { 922 if (!IS_RATE_DEFINED(sn, final_rix)) { 923 device_printf(sc->sc_dev, "%s: ts_rate=%d ts_finaltsi=%d\n", 924 __func__, ts->ts_rate, ts->ts_finaltsi); 925 badrate(ifp, 0, ts->ts_rate, long_tries, status); 926 return; 927 } 928 /* 929 * Only one rate was used; optimize work. 930 */ 931 IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL, 932 &an->an_node, "%s: size %d (%d bytes) %s rate/short/long %d %s/%d/%d nframes/nbad [%d/%d]", 933 __func__, 934 bin_to_size(size_to_bin(frame_size)), 935 frame_size, 936 status ? "FAIL" : "OK", 937 dot11rate(rt, final_rix), dot11rate_label(rt, final_rix), 938 short_tries, long_tries, nframes, nbad); 939 update_stats(sc, an, frame_size, 940 final_rix, long_tries, 941 0, 0, 942 0, 0, 943 0, 0, 944 short_tries, long_tries, status, 945 nframes, nbad); 946 update_ewma_stats(sc, an, frame_size, 947 final_rix, long_tries, 948 0, 0, 949 0, 0, 950 0, 0, 951 short_tries, long_tries, status, 952 nframes, nbad); 953 954 } else { 955 int finalTSIdx = ts->ts_finaltsi; 956 int i; 957 958 /* 959 * Process intermediate rates that failed. 960 */ 961 962 IEEE80211_NOTE(an->an_node.ni_vap, IEEE80211_MSG_RATECTL, 963 &an->an_node, 964 "%s: size %d (%d bytes) finaltsidx %d short %d long %d %s rate/try [%d %s/%d %d %s/%d %d %s/%d %d %s/%d] nframes/nbad [%d/%d]", 965 __func__, 966 bin_to_size(size_to_bin(frame_size)), 967 frame_size, 968 finalTSIdx, 969 short_tries, 970 long_tries, 971 status ? "FAIL" : "OK", 972 dot11rate(rt, rc[0].rix), 973 dot11rate_label(rt, rc[0].rix), rc[0].tries, 974 dot11rate(rt, rc[1].rix), 975 dot11rate_label(rt, rc[1].rix), rc[1].tries, 976 dot11rate(rt, rc[2].rix), 977 dot11rate_label(rt, rc[2].rix), rc[2].tries, 978 dot11rate(rt, rc[3].rix), 979 dot11rate_label(rt, rc[3].rix), rc[3].tries, 980 nframes, nbad); 981 982 for (i = 0; i < 4; i++) { 983 if (rc[i].tries && !IS_RATE_DEFINED(sn, rc[i].rix)) 984 badrate(ifp, 0, rc[i].ratecode, rc[i].tries, 985 status); 986 } 987 988 /* 989 * NB: series > 0 are not penalized for failure 990 * based on the try counts under the assumption 991 * that losses are often bursty and since we 992 * sample higher rates 1 try at a time doing so 993 * may unfairly penalize them. 994 */ 995 if (rc[0].tries) { 996 update_stats(sc, an, frame_size, 997 rc[0].rix, rc[0].tries, 998 rc[1].rix, rc[1].tries, 999 rc[2].rix, rc[2].tries, 1000 rc[3].rix, rc[3].tries, 1001 short_tries, long_tries, 1002 long_tries > rc[0].tries, 1003 nframes, nbad); 1004 long_tries -= rc[0].tries; 1005 } 1006 1007 if (rc[1].tries && finalTSIdx > 0) { 1008 update_stats(sc, an, frame_size, 1009 rc[1].rix, rc[1].tries, 1010 rc[2].rix, rc[2].tries, 1011 rc[3].rix, rc[3].tries, 1012 0, 0, 1013 short_tries, long_tries, 1014 status, 1015 nframes, nbad); 1016 long_tries -= rc[1].tries; 1017 } 1018 1019 if (rc[2].tries && finalTSIdx > 1) { 1020 update_stats(sc, an, frame_size, 1021 rc[2].rix, rc[2].tries, 1022 rc[3].rix, rc[3].tries, 1023 0, 0, 1024 0, 0, 1025 short_tries, long_tries, 1026 status, 1027 nframes, nbad); 1028 long_tries -= rc[2].tries; 1029 } 1030 1031 if (rc[3].tries && finalTSIdx > 2) { 1032 update_stats(sc, an, frame_size, 1033 rc[3].rix, rc[3].tries, 1034 0, 0, 1035 0, 0, 1036 0, 0, 1037 short_tries, long_tries, 1038 status, 1039 nframes, nbad); 1040 } 1041 1042 update_ewma_stats(sc, an, frame_size, 1043 rc[0].rix, rc[0].tries, 1044 rc[1].rix, rc[1].tries, 1045 rc[2].rix, rc[2].tries, 1046 rc[3].rix, rc[3].tries, 1047 short_tries, long_tries, 1048 long_tries > rc[0].tries, 1049 nframes, nbad); 1050 1051 } 1052 } 1053 1054 void 1055 ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew) 1056 { 1057 if (isnew) 1058 ath_rate_ctl_reset(sc, &an->an_node); 1059 } 1060 1061 static const struct txschedule *mrr_schedules[IEEE80211_MODE_MAX+2] = { 1062 NULL, /* IEEE80211_MODE_AUTO */ 1063 series_11a, /* IEEE80211_MODE_11A */ 1064 series_11g, /* IEEE80211_MODE_11B */ 1065 series_11g, /* IEEE80211_MODE_11G */ 1066 NULL, /* IEEE80211_MODE_FH */ 1067 series_11a, /* IEEE80211_MODE_TURBO_A */ 1068 series_11g, /* IEEE80211_MODE_TURBO_G */ 1069 series_11a, /* IEEE80211_MODE_STURBO_A */ 1070 series_11na, /* IEEE80211_MODE_11NA */ 1071 series_11ng, /* IEEE80211_MODE_11NG */ 1072 series_half, /* IEEE80211_MODE_HALF */ 1073 series_quarter, /* IEEE80211_MODE_QUARTER */ 1074 }; 1075 1076 /* 1077 * Initialize the tables for a node. 1078 */ 1079 static void 1080 ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni) 1081 { 1082 #define RATE(_ix) (ni->ni_rates.rs_rates[(_ix)] & IEEE80211_RATE_VAL) 1083 #define DOT11RATE(_ix) (rt->info[(_ix)].dot11Rate & IEEE80211_RATE_VAL) 1084 #define MCS(_ix) (ni->ni_htrates.rs_rates[_ix] | IEEE80211_RATE_MCS) 1085 struct ath_node *an = ATH_NODE(ni); 1086 struct sample_node *sn = ATH_NODE_SAMPLE(an); 1087 const HAL_RATE_TABLE *rt = sc->sc_currates; 1088 int x, y, rix; 1089 1090 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 1091 1092 KASSERT(sc->sc_curmode < IEEE80211_MODE_MAX+2, 1093 ("curmode %u", sc->sc_curmode)); 1094 1095 sn->sched = mrr_schedules[sc->sc_curmode]; 1096 KASSERT(sn->sched != NULL, 1097 ("no mrr schedule for mode %u", sc->sc_curmode)); 1098 1099 sn->static_rix = -1; 1100 ath_rate_update_static_rix(sc, ni); 1101 1102 sn->currates = sc->sc_currates; 1103 1104 /* 1105 * Construct a bitmask of usable rates. This has all 1106 * negotiated rates minus those marked by the hal as 1107 * to be ignored for doing rate control. 1108 */ 1109 sn->ratemask = 0; 1110 /* MCS rates */ 1111 if (ni->ni_flags & IEEE80211_NODE_HT) { 1112 for (x = 0; x < ni->ni_htrates.rs_nrates; x++) { 1113 rix = sc->sc_rixmap[MCS(x)]; 1114 if (rix == 0xff) 1115 continue; 1116 /* skip rates marked broken by hal */ 1117 if (!rt->info[rix].valid) 1118 continue; 1119 KASSERT(rix < SAMPLE_MAXRATES, 1120 ("mcs %u has rix %d", MCS(x), rix)); 1121 sn->ratemask |= (uint64_t) 1<<rix; 1122 } 1123 } 1124 1125 /* Legacy rates */ 1126 for (x = 0; x < ni->ni_rates.rs_nrates; x++) { 1127 rix = sc->sc_rixmap[RATE(x)]; 1128 if (rix == 0xff) 1129 continue; 1130 /* skip rates marked broken by hal */ 1131 if (!rt->info[rix].valid) 1132 continue; 1133 KASSERT(rix < SAMPLE_MAXRATES, 1134 ("rate %u has rix %d", RATE(x), rix)); 1135 sn->ratemask |= (uint64_t) 1<<rix; 1136 } 1137 #ifdef IEEE80211_DEBUG 1138 if (ieee80211_msg(ni->ni_vap, IEEE80211_MSG_RATECTL)) { 1139 uint64_t mask; 1140 1141 ieee80211_note(ni->ni_vap, "[%6D] %s: size 1600 rate/tt", 1142 ni->ni_macaddr, ":", __func__); 1143 for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) { 1144 if ((mask & 1) == 0) 1145 continue; 1146 printf(" %d %s/%d", dot11rate(rt, rix), dot11rate_label(rt, rix), 1147 calc_usecs_unicast_packet(sc, 1600, rix, 0,0, 1148 (ni->ni_chw == 40))); 1149 } 1150 printf("\n"); 1151 } 1152 #endif 1153 for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) { 1154 int size = bin_to_size(y); 1155 uint64_t mask; 1156 1157 sn->packets_sent[y] = 0; 1158 sn->current_sample_rix[y] = -1; 1159 sn->last_sample_rix[y] = 0; 1160 /* XXX start with first valid rate */ 1161 sn->current_rix[y] = ffs(sn->ratemask)-1; 1162 1163 /* 1164 * Initialize the statistics buckets; these are 1165 * indexed by the rate code index. 1166 */ 1167 for (rix = 0, mask = sn->ratemask; mask != 0; rix++, mask >>= 1) { 1168 if ((mask & 1) == 0) /* not a valid rate */ 1169 continue; 1170 sn->stats[y][rix].successive_failures = 0; 1171 sn->stats[y][rix].tries = 0; 1172 sn->stats[y][rix].total_packets = 0; 1173 sn->stats[y][rix].packets_acked = 0; 1174 sn->stats[y][rix].last_tx = 0; 1175 sn->stats[y][rix].ewma_pct = 0; 1176 1177 sn->stats[y][rix].perfect_tx_time = 1178 calc_usecs_unicast_packet(sc, size, rix, 0, 0, 1179 (ni->ni_chw == 40)); 1180 sn->stats[y][rix].average_tx_time = 1181 sn->stats[y][rix].perfect_tx_time; 1182 } 1183 } 1184 #if 0 1185 /* XXX 0, num_rates-1 are wrong */ 1186 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni, 1187 "%s: %d rates %d%sMbps (%dus)- %d%sMbps (%dus)", __func__, 1188 sn->num_rates, 1189 DOT11RATE(0)/2, DOT11RATE(0) % 1 ? ".5" : "", 1190 sn->stats[1][0].perfect_tx_time, 1191 DOT11RATE(sn->num_rates-1)/2, DOT11RATE(sn->num_rates-1) % 1 ? ".5" : "", 1192 sn->stats[1][sn->num_rates-1].perfect_tx_time 1193 ); 1194 #endif 1195 /* set the visible bit-rate */ 1196 if (sn->static_rix != -1) 1197 ni->ni_txrate = DOT11RATE(sn->static_rix); 1198 else 1199 ni->ni_txrate = RATE(0); 1200 #undef RATE 1201 #undef DOT11RATE 1202 } 1203 1204 /* 1205 * Fetch the statistics for the given node. 1206 * 1207 * The ieee80211 node must be referenced and unlocked, however the ath_node 1208 * must be locked. 1209 * 1210 * The main difference here is that we convert the rate indexes 1211 * to 802.11 rates, or the userland output won't make much sense 1212 * as it has no access to the rix table. 1213 */ 1214 int 1215 ath_rate_fetch_node_stats(struct ath_softc *sc, struct ath_node *an, 1216 struct ath_rateioctl *rs) 1217 { 1218 struct sample_node *sn = ATH_NODE_SAMPLE(an); 1219 const HAL_RATE_TABLE *rt = sc->sc_currates; 1220 struct ath_rateioctl_tlv av; 1221 struct ath_rateioctl_rt *tv; 1222 int y; 1223 int o = 0; 1224 1225 ATH_NODE_LOCK_ASSERT(an); 1226 1227 /* 1228 * Ensure there's enough space for the statistics. 1229 */ 1230 if (rs->len < 1231 sizeof(struct ath_rateioctl_tlv) + 1232 sizeof(struct ath_rateioctl_rt) + 1233 sizeof(struct ath_rateioctl_tlv) + 1234 sizeof(struct sample_node)) { 1235 device_printf(sc->sc_dev, "%s: len=%d, too short\n", 1236 __func__, 1237 rs->len); 1238 return (EINVAL); 1239 } 1240 1241 /* 1242 * Take a temporary copy of the sample node state so we can 1243 * modify it before we copy it. 1244 */ 1245 tv = malloc(sizeof(struct ath_rateioctl_rt), M_TEMP, 1246 M_NOWAIT | M_ZERO); 1247 if (tv == NULL) { 1248 return (ENOMEM); 1249 } 1250 1251 /* 1252 * Populate the rate table mapping TLV. 1253 */ 1254 tv->nentries = rt->rateCount; 1255 for (y = 0; y < rt->rateCount; y++) { 1256 tv->ratecode[y] = rt->info[y].dot11Rate & IEEE80211_RATE_VAL; 1257 if (rt->info[y].phy == IEEE80211_T_HT) 1258 tv->ratecode[y] |= IEEE80211_RATE_MCS; 1259 } 1260 1261 o = 0; 1262 /* 1263 * First TLV - rate code mapping 1264 */ 1265 av.tlv_id = ATH_RATE_TLV_RATETABLE; 1266 av.tlv_len = sizeof(struct ath_rateioctl_rt); 1267 copyout(&av, rs->buf + o, sizeof(struct ath_rateioctl_tlv)); 1268 o += sizeof(struct ath_rateioctl_tlv); 1269 copyout(tv, rs->buf + o, sizeof(struct ath_rateioctl_rt)); 1270 o += sizeof(struct ath_rateioctl_rt); 1271 1272 /* 1273 * Second TLV - sample node statistics 1274 */ 1275 av.tlv_id = ATH_RATE_TLV_SAMPLENODE; 1276 av.tlv_len = sizeof(struct sample_node); 1277 copyout(&av, rs->buf + o, sizeof(struct ath_rateioctl_tlv)); 1278 o += sizeof(struct ath_rateioctl_tlv); 1279 1280 /* 1281 * Copy the statistics over to the provided buffer. 1282 */ 1283 copyout(sn, rs->buf + o, sizeof(struct sample_node)); 1284 o += sizeof(struct sample_node); 1285 1286 free(tv, M_TEMP); 1287 1288 return (0); 1289 } 1290 1291 static void 1292 sample_stats(void *arg, struct ieee80211_node *ni) 1293 { 1294 struct ath_softc *sc = arg; 1295 const HAL_RATE_TABLE *rt = sc->sc_currates; 1296 struct sample_node *sn = ATH_NODE_SAMPLE(ATH_NODE(ni)); 1297 uint64_t mask; 1298 int rix, y; 1299 1300 printf("\n[%s] refcnt %d static_rix (%d %s) ratemask 0x%jx\n", 1301 ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni), 1302 dot11rate(rt, sn->static_rix), 1303 dot11rate_label(rt, sn->static_rix), 1304 (uintmax_t)sn->ratemask); 1305 for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) { 1306 printf("[%4u] cur rix %d (%d %s) since switch: packets %d ticks %u\n", 1307 bin_to_size(y), sn->current_rix[y], 1308 dot11rate(rt, sn->current_rix[y]), 1309 dot11rate_label(rt, sn->current_rix[y]), 1310 sn->packets_since_switch[y], sn->ticks_since_switch[y]); 1311 printf("[%4u] last sample (%d %s) cur sample (%d %s) packets sent %d\n", 1312 bin_to_size(y), 1313 dot11rate(rt, sn->last_sample_rix[y]), 1314 dot11rate_label(rt, sn->last_sample_rix[y]), 1315 dot11rate(rt, sn->current_sample_rix[y]), 1316 dot11rate_label(rt, sn->current_sample_rix[y]), 1317 sn->packets_sent[y]); 1318 printf("[%4u] packets since sample %d sample tt %u\n", 1319 bin_to_size(y), sn->packets_since_sample[y], 1320 sn->sample_tt[y]); 1321 } 1322 for (mask = sn->ratemask, rix = 0; mask != 0; mask >>= 1, rix++) { 1323 if ((mask & 1) == 0) 1324 continue; 1325 for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) { 1326 if (sn->stats[y][rix].total_packets == 0) 1327 continue; 1328 printf("[%2u %s:%4u] %8ju:%-8ju (%3d%%) (EWMA %3d.%1d%%) T %8ju F %4d avg %5u last %u\n", 1329 dot11rate(rt, rix), dot11rate_label(rt, rix), 1330 bin_to_size(y), 1331 (uintmax_t) sn->stats[y][rix].total_packets, 1332 (uintmax_t) sn->stats[y][rix].packets_acked, 1333 (int) ((sn->stats[y][rix].packets_acked * 100ULL) / 1334 sn->stats[y][rix].total_packets), 1335 sn->stats[y][rix].ewma_pct / 10, 1336 sn->stats[y][rix].ewma_pct % 10, 1337 (uintmax_t) sn->stats[y][rix].tries, 1338 sn->stats[y][rix].successive_failures, 1339 sn->stats[y][rix].average_tx_time, 1340 ticks - sn->stats[y][rix].last_tx); 1341 } 1342 } 1343 } 1344 1345 static int 1346 ath_rate_sysctl_stats(SYSCTL_HANDLER_ARGS) 1347 { 1348 struct ath_softc *sc = arg1; 1349 struct ifnet *ifp = sc->sc_ifp; 1350 struct ieee80211com *ic = ifp->if_l2com; 1351 int error, v; 1352 1353 v = 0; 1354 error = sysctl_handle_int(oidp, &v, 0, req); 1355 if (error || !req->newptr) 1356 return error; 1357 ieee80211_iterate_nodes(&ic->ic_sta, sample_stats, sc); 1358 return 0; 1359 } 1360 1361 static int 1362 ath_rate_sysctl_smoothing_rate(SYSCTL_HANDLER_ARGS) 1363 { 1364 struct sample_softc *ssc = arg1; 1365 int rate, error; 1366 1367 rate = ssc->smoothing_rate; 1368 error = sysctl_handle_int(oidp, &rate, 0, req); 1369 if (error || !req->newptr) 1370 return error; 1371 if (!(0 <= rate && rate < 100)) 1372 return EINVAL; 1373 ssc->smoothing_rate = rate; 1374 ssc->smoothing_minpackets = 100 / (100 - rate); 1375 return 0; 1376 } 1377 1378 static int 1379 ath_rate_sysctl_sample_rate(SYSCTL_HANDLER_ARGS) 1380 { 1381 struct sample_softc *ssc = arg1; 1382 int rate, error; 1383 1384 rate = ssc->sample_rate; 1385 error = sysctl_handle_int(oidp, &rate, 0, req); 1386 if (error || !req->newptr) 1387 return error; 1388 if (!(2 <= rate && rate <= 100)) 1389 return EINVAL; 1390 ssc->sample_rate = rate; 1391 return 0; 1392 } 1393 1394 static void 1395 ath_rate_sysctlattach(struct ath_softc *sc, struct sample_softc *ssc) 1396 { 1397 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->sc_dev); 1398 struct sysctl_oid *tree = device_get_sysctl_tree(sc->sc_dev); 1399 1400 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 1401 "smoothing_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0, 1402 ath_rate_sysctl_smoothing_rate, "I", 1403 "sample: smoothing rate for avg tx time (%%)"); 1404 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 1405 "sample_rate", CTLTYPE_INT | CTLFLAG_RW, ssc, 0, 1406 ath_rate_sysctl_sample_rate, "I", 1407 "sample: percent air time devoted to sampling new rates (%%)"); 1408 /* XXX max_successive_failures, stale_failure_timeout, min_switch */ 1409 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, 1410 "sample_stats", CTLTYPE_INT | CTLFLAG_RW, sc, 0, 1411 ath_rate_sysctl_stats, "I", "sample: print statistics"); 1412 } 1413 1414 struct ath_ratectrl * 1415 ath_rate_attach(struct ath_softc *sc) 1416 { 1417 struct sample_softc *ssc; 1418 1419 ssc = malloc(sizeof(struct sample_softc), M_DEVBUF, M_NOWAIT|M_ZERO); 1420 if (ssc == NULL) 1421 return NULL; 1422 ssc->arc.arc_space = sizeof(struct sample_node); 1423 ssc->smoothing_rate = 95; /* ewma percentage ([0..99]) */ 1424 ssc->smoothing_minpackets = 100 / (100 - ssc->smoothing_rate); 1425 ssc->sample_rate = 10; /* %time to try diff tx rates */ 1426 ssc->max_successive_failures = 3; /* threshold for rate sampling*/ 1427 ssc->stale_failure_timeout = 10 * hz; /* 10 seconds */ 1428 ssc->min_switch = hz; /* 1 second */ 1429 ath_rate_sysctlattach(sc, ssc); 1430 return &ssc->arc; 1431 } 1432 1433 void 1434 ath_rate_detach(struct ath_ratectrl *arc) 1435 { 1436 struct sample_softc *ssc = (struct sample_softc *) arc; 1437 1438 free(ssc, M_DEVBUF); 1439 } 1440