if_ath_tx_ht.c revision 243786
1/*- 2 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd. 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 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: head/sys/dev/ath/if_ath_tx_ht.c 243786 2012-12-02 06:24:08Z adrian $"); 32 33#include "opt_inet.h" 34#include "opt_ath.h" 35#include "opt_wlan.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/sysctl.h> 40#include <sys/mbuf.h> 41#include <sys/malloc.h> 42#include <sys/lock.h> 43#include <sys/mutex.h> 44#include <sys/kernel.h> 45#include <sys/socket.h> 46#include <sys/sockio.h> 47#include <sys/errno.h> 48#include <sys/callout.h> 49#include <sys/bus.h> 50#include <sys/endian.h> 51#include <sys/kthread.h> 52#include <sys/taskqueue.h> 53#include <sys/priv.h> 54 55#include <machine/bus.h> 56 57#include <net/if.h> 58#include <net/if_dl.h> 59#include <net/if_media.h> 60#include <net/if_types.h> 61#include <net/if_arp.h> 62#include <net/ethernet.h> 63#include <net/if_llc.h> 64 65#include <net80211/ieee80211_var.h> 66#include <net80211/ieee80211_regdomain.h> 67#ifdef IEEE80211_SUPPORT_SUPERG 68#include <net80211/ieee80211_superg.h> 69#endif 70#ifdef IEEE80211_SUPPORT_TDMA 71#include <net80211/ieee80211_tdma.h> 72#endif 73 74#include <net/bpf.h> 75 76#ifdef INET 77#include <netinet/in.h> 78#include <netinet/if_ether.h> 79#endif 80 81#include <dev/ath/if_athvar.h> 82#include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */ 83#include <dev/ath/ath_hal/ah_diagcodes.h> 84 85#ifdef ATH_TX99_DIAG 86#include <dev/ath/ath_tx99/ath_tx99.h> 87#endif 88 89#include <dev/ath/if_ath_tx.h> /* XXX for some support functions */ 90#include <dev/ath/if_ath_tx_ht.h> 91#include <dev/ath/if_athrate.h> 92#include <dev/ath/if_ath_debug.h> 93 94/* 95 * XXX net80211? 96 */ 97#define IEEE80211_AMPDU_SUBFRAME_DEFAULT 32 98 99#define ATH_AGGR_DELIM_SZ 4 /* delimiter size */ 100#define ATH_AGGR_MINPLEN 256 /* in bytes, minimum packet length */ 101/* number of delimiters for encryption padding */ 102#define ATH_AGGR_ENCRYPTDELIM 10 103 104/* 105 * returns delimiter padding required given the packet length 106 */ 107#define ATH_AGGR_GET_NDELIM(_len) \ 108 (((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \ 109 (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2) 110 111#define PADBYTES(_len) ((4 - ((_len) % 4)) % 4) 112 113int ath_max_4ms_framelen[4][32] = { 114 [MCS_HT20] = { 115 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172, 116 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280, 117 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532, 118 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532, 119 }, 120 [MCS_HT20_SGI] = { 121 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744, 122 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532, 123 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532, 124 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532, 125 }, 126 [MCS_HT40] = { 127 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532, 128 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532, 129 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532, 130 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532, 131 }, 132 [MCS_HT40_SGI] = { 133 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532, 134 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532, 135 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532, 136 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532, 137 } 138}; 139 140/* 141 * XXX should be in net80211 142 */ 143static int ieee80211_mpdudensity_map[] = { 144 0, /* IEEE80211_HTCAP_MPDUDENSITY_NA */ 145 25, /* IEEE80211_HTCAP_MPDUDENSITY_025 */ 146 50, /* IEEE80211_HTCAP_MPDUDENSITY_05 */ 147 100, /* IEEE80211_HTCAP_MPDUDENSITY_1 */ 148 200, /* IEEE80211_HTCAP_MPDUDENSITY_2 */ 149 400, /* IEEE80211_HTCAP_MPDUDENSITY_4 */ 150 800, /* IEEE80211_HTCAP_MPDUDENSITY_8 */ 151 1600, /* IEEE80211_HTCAP_MPDUDENSITY_16 */ 152}; 153 154/* 155 * XXX should be in the HAL/net80211 ? 156 */ 157#define BITS_PER_BYTE 8 158#define OFDM_PLCP_BITS 22 159#define HT_RC_2_MCS(_rc) ((_rc) & 0x7f) 160#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1) 161#define L_STF 8 162#define L_LTF 8 163#define L_SIG 4 164#define HT_SIG 8 165#define HT_STF 4 166#define HT_LTF(_ns) (4 * (_ns)) 167#define SYMBOL_TIME(_ns) ((_ns) << 2) // ns * 4 us 168#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) // ns * 3.6 us 169#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2) 170#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18) 171#define IS_HT_RATE(_rate) ((_rate) & 0x80) 172 173const uint32_t bits_per_symbol[][2] = { 174 /* 20MHz 40MHz */ 175 { 26, 54 }, // 0: BPSK 176 { 52, 108 }, // 1: QPSK 1/2 177 { 78, 162 }, // 2: QPSK 3/4 178 { 104, 216 }, // 3: 16-QAM 1/2 179 { 156, 324 }, // 4: 16-QAM 3/4 180 { 208, 432 }, // 5: 64-QAM 2/3 181 { 234, 486 }, // 6: 64-QAM 3/4 182 { 260, 540 }, // 7: 64-QAM 5/6 183 { 52, 108 }, // 8: BPSK 184 { 104, 216 }, // 9: QPSK 1/2 185 { 156, 324 }, // 10: QPSK 3/4 186 { 208, 432 }, // 11: 16-QAM 1/2 187 { 312, 648 }, // 12: 16-QAM 3/4 188 { 416, 864 }, // 13: 64-QAM 2/3 189 { 468, 972 }, // 14: 64-QAM 3/4 190 { 520, 1080 }, // 15: 64-QAM 5/6 191 { 78, 162 }, // 16: BPSK 192 { 156, 324 }, // 17: QPSK 1/2 193 { 234, 486 }, // 18: QPSK 3/4 194 { 312, 648 }, // 19: 16-QAM 1/2 195 { 468, 972 }, // 20: 16-QAM 3/4 196 { 624, 1296 }, // 21: 64-QAM 2/3 197 { 702, 1458 }, // 22: 64-QAM 3/4 198 { 780, 1620 }, // 23: 64-QAM 5/6 199 { 104, 216 }, // 24: BPSK 200 { 208, 432 }, // 25: QPSK 1/2 201 { 312, 648 }, // 26: QPSK 3/4 202 { 416, 864 }, // 27: 16-QAM 1/2 203 { 624, 1296 }, // 28: 16-QAM 3/4 204 { 832, 1728 }, // 29: 64-QAM 2/3 205 { 936, 1944 }, // 30: 64-QAM 3/4 206 { 1040, 2160 }, // 31: 64-QAM 5/6 207}; 208 209/* 210 * Fill in the rate array information based on the current 211 * node configuration and the choices made by the rate 212 * selection code and ath_buf setup code. 213 * 214 * Later on, this may end up also being made by the 215 * rate control code, but for now it can live here. 216 * 217 * This needs to be called just before the packet is 218 * queued to the software queue or hardware queue, 219 * so all of the needed fields in bf_state are setup. 220 */ 221void 222ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf) 223{ 224 struct ieee80211_node *ni = bf->bf_node; 225 struct ieee80211com *ic = ni->ni_ic; 226 const HAL_RATE_TABLE *rt = sc->sc_currates; 227 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 228 uint8_t rate; 229 int i; 230 231 for (i = 0; i < ATH_RC_NUM; i++) { 232 rc[i].flags = 0; 233 if (rc[i].tries == 0) 234 continue; 235 236 rate = rt->info[rc[i].rix].rateCode; 237 238 /* 239 * XXX only do this for legacy rates? 240 */ 241 if (bf->bf_state.bfs_shpream) 242 rate |= rt->info[rc[i].rix].shortPreamble; 243 244 /* 245 * Save this, used by the TX and completion code 246 */ 247 rc[i].ratecode = rate; 248 249 if (bf->bf_state.bfs_txflags & 250 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 251 rc[i].flags |= ATH_RC_RTSCTS_FLAG; 252 253 /* Only enable shortgi, 2040, dual-stream if HT is set */ 254 if (IS_HT_RATE(rate)) { 255 rc[i].flags |= ATH_RC_HT_FLAG; 256 257 if (ni->ni_chw == 40) 258 rc[i].flags |= ATH_RC_CW40_FLAG; 259 260 if (ni->ni_chw == 40 && 261 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 262 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 263 rc[i].flags |= ATH_RC_SGI_FLAG; 264 265 if (ni->ni_chw == 20 && 266 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 267 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 268 rc[i].flags |= ATH_RC_SGI_FLAG; 269 270 /* XXX dual stream? and 3-stream? */ 271 } 272 273 /* 274 * Calculate the maximum 4ms frame length based 275 * on the MCS rate, SGI and channel width flags. 276 */ 277 if ((rc[i].flags & ATH_RC_HT_FLAG) && 278 (HT_RC_2_MCS(rate) < 32)) { 279 int j; 280 if (rc[i].flags & ATH_RC_CW40_FLAG) { 281 if (rc[i].flags & ATH_RC_SGI_FLAG) 282 j = MCS_HT40_SGI; 283 else 284 j = MCS_HT40; 285 } else { 286 if (rc[i].flags & ATH_RC_SGI_FLAG) 287 j = MCS_HT20_SGI; 288 else 289 j = MCS_HT20; 290 } 291 rc[i].max4msframelen = 292 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)]; 293 } else 294 rc[i].max4msframelen = 0; 295 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 296 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n", 297 __func__, i, rate, rc[i].flags, rc[i].max4msframelen); 298 } 299} 300 301/* 302 * Return the number of delimiters to be added to 303 * meet the minimum required mpdudensity. 304 * 305 * Caller should make sure that the rate is HT. 306 * 307 * TODO: is this delimiter calculation supposed to be the 308 * total frame length, the hdr length, the data length (including 309 * delimiters, padding, CRC, etc) or ? 310 * 311 * TODO: this should ensure that the rate control information 312 * HAS been setup for the first rate. 313 * 314 * TODO: ensure this is only called for MCS rates. 315 * 316 * TODO: enforce MCS < 31 317 */ 318static int 319ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 320 uint16_t pktlen) 321{ 322 const HAL_RATE_TABLE *rt = sc->sc_currates; 323 struct ieee80211_node *ni = first_bf->bf_node; 324 struct ieee80211vap *vap = ni->ni_vap; 325 int ndelim, mindelim = 0; 326 int mpdudensity; /* in 1/100'th of a microsecond */ 327 uint8_t rc, rix, flags; 328 int width, half_gi; 329 uint32_t nsymbits, nsymbols; 330 uint16_t minlen; 331 332 /* 333 * vap->iv_ampdu_density is a value, rather than the actual 334 * density. 335 */ 336 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16) 337 mpdudensity = 1600; /* maximum density */ 338 else 339 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density]; 340 341 /* Select standard number of delimiters based on frame length */ 342 ndelim = ATH_AGGR_GET_NDELIM(pktlen); 343 344 /* 345 * If encryption is enabled, add extra delimiters to let the 346 * crypto hardware catch up. This could be tuned per-MAC and 347 * per-rate, but for now we'll simply assume encryption is 348 * always enabled. 349 */ 350 ndelim += ATH_AGGR_ENCRYPTDELIM; 351 352 /* 353 * For AR9380, there's a minimum number of delimeters 354 * required when doing RTS. 355 */ 356 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR) 357 && ndelim < AH_FIRST_DESC_NDELIMS) 358 ndelim = AH_FIRST_DESC_NDELIMS; 359 360 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 361 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 362 __func__, pktlen, ndelim, mpdudensity); 363 364 /* 365 * If the MPDU density is 0, we can return here. 366 * Otherwise, we need to convert the desired mpdudensity 367 * into a byte length, based on the rate in the subframe. 368 */ 369 if (mpdudensity == 0) 370 return ndelim; 371 372 /* 373 * Convert desired mpdu density from microeconds to bytes based 374 * on highest rate in rate series (i.e. first rate) to determine 375 * required minimum length for subframe. Take into account 376 * whether high rate is 20 or 40Mhz and half or full GI. 377 */ 378 rix = first_bf->bf_state.bfs_rc[0].rix; 379 rc = rt->info[rix].rateCode; 380 flags = first_bf->bf_state.bfs_rc[0].flags; 381 width = !! (flags & ATH_RC_CW40_FLAG); 382 half_gi = !! (flags & ATH_RC_SGI_FLAG); 383 384 /* 385 * mpdudensity is in 1/100th of a usec, so divide by 100 386 */ 387 if (half_gi) 388 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 389 else 390 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 391 nsymbols /= 100; 392 393 if (nsymbols == 0) 394 nsymbols = 1; 395 396 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 397 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 398 399 /* 400 * Min length is the minimum frame length for the 401 * required MPDU density. 402 */ 403 if (pktlen < minlen) { 404 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 405 ndelim = MAX(mindelim, ndelim); 406 } 407 408 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 409 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 410 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 411 412 return ndelim; 413} 414 415/* 416 * Fetch the aggregation limit. 417 * 418 * It's the lowest of the four rate series 4ms frame length. 419 */ 420static int 421ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 422{ 423 int amin = 65530; 424 int i; 425 426 for (i = 0; i < ATH_RC_NUM; i++) { 427 if (bf->bf_state.bfs_rc[i].tries == 0) 428 continue; 429 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 430 } 431 432 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 433 __func__, amin); 434 435 return amin; 436} 437 438/* 439 * Setup a 11n rate series structure 440 * 441 * This should be called for both legacy and MCS rates. 442 * 443 * It, along with ath_buf_set_rate, must be called -after- a burst 444 * or aggregate is setup. 445 */ 446static void 447ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 448 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 449{ 450 struct ieee80211com *ic = ni->ni_ic; 451 struct ath_hal *ah = sc->sc_ah; 452 HAL_BOOL shortPreamble = AH_FALSE; 453 const HAL_RATE_TABLE *rt = sc->sc_currates; 454 int i; 455 int pktlen; 456 int flags = bf->bf_state.bfs_txflags; 457 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 458 459 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 460 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 461 shortPreamble = AH_TRUE; 462 463 /* 464 * If this is the first frame in an aggregate series, 465 * use the aggregate length. 466 */ 467 if (bf->bf_state.bfs_aggr) 468 pktlen = bf->bf_state.bfs_al; 469 else 470 pktlen = bf->bf_state.bfs_pktlen; 471 472 /* 473 * XXX TODO: modify this routine to use the bfs_rc[x].flags 474 * XXX fields. 475 */ 476 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 477 for (i = 0; i < ATH_RC_NUM; i++) { 478 /* Only set flags for actual TX attempts */ 479 if (rc[i].tries == 0) 480 continue; 481 482 series[i].Tries = rc[i].tries; 483 484 /* 485 * XXX this isn't strictly correct - sc_txchainmask 486 * XXX isn't the currently active chainmask; 487 * XXX it's the interface chainmask at startup. 488 * XXX It's overridden in the HAL rate scenario function 489 * XXX for now. 490 */ 491 series[i].ChSel = sc->sc_txchainmask; 492 493 if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 494 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 495 496 /* 497 * Transmit 40MHz frames only if the node has negotiated 498 * it rather than whether the node is capable of it or not. 499 * It's subtly different in the hostap case. 500 */ 501 if (ni->ni_chw == 40) 502 series[i].RateFlags |= HAL_RATESERIES_2040; 503 504 /* 505 * Set short-GI only if the node has advertised it 506 * the channel width is suitable, and we support it. 507 * We don't currently have a "negotiated" set of bits - 508 * ni_htcap is what the remote end sends, not what this 509 * node is capable of. 510 */ 511 if (ni->ni_chw == 40 && 512 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 513 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 514 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 515 516 if (ni->ni_chw == 20 && 517 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 518 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 519 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 520 521 series[i].Rate = rt->info[rc[i].rix].rateCode; 522 series[i].RateIndex = rc[i].rix; 523 series[i].tx_power_cap = 0x3f; /* XXX for now */ 524 525 /* 526 * PktDuration doesn't include slot, ACK, RTS, etc timing - 527 * it's just the packet duration 528 */ 529 if (series[i].Rate & IEEE80211_RATE_MCS) { 530 series[i].PktDuration = 531 ath_computedur_ht(pktlen 532 , series[i].Rate 533 , HT_RC_2_STREAMS(series[i].Rate) 534 , series[i].RateFlags & HAL_RATESERIES_2040 535 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 536 } else { 537 if (shortPreamble) 538 series[i].Rate |= 539 rt->info[rc[i].rix].shortPreamble; 540 series[i].PktDuration = ath_hal_computetxtime(ah, 541 rt, pktlen, rc[i].rix, shortPreamble); 542 } 543 } 544} 545 546#if 0 547static void 548ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 549{ 550 int i; 551 for (i = 0; i < ATH_RC_NUM; i++) { 552 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 553 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 554 i, 555 series[i].Rate, 556 series[i].Tries, 557 series[i].PktDuration, 558 series[i].ChSel, 559 series[i].tx_power_cap, 560 series[i].RateFlags); 561 } 562} 563#endif 564 565/* 566 * Setup the 11n rate scenario and burst duration for the given TX descriptor 567 * list. 568 * 569 * This isn't useful for sending beacon frames, which has different needs 570 * wrt what's passed into the rate scenario function. 571 */ 572void 573ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 574 struct ath_buf *bf) 575{ 576 HAL_11N_RATE_SERIES series[4]; 577 struct ath_desc *ds = bf->bf_desc; 578 struct ath_hal *ah = sc->sc_ah; 579 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 580 int ctsrate = bf->bf_state.bfs_ctsrate; 581 int flags = bf->bf_state.bfs_txflags; 582 583 /* Setup rate scenario */ 584 memset(&series, 0, sizeof(series)); 585 586 ath_rateseries_setup(sc, ni, bf, series); 587 588#if 0 589 ath_rateseries_print(sc, series); 590#endif 591 592 /* Set rate scenario */ 593 /* 594 * Note: Don't allow hardware to override the duration on 595 * ps-poll packets. 596 */ 597 ath_hal_set11nratescenario(ah, ds, 598 !is_pspoll, /* whether to override the duration or not */ 599 ctsrate, /* rts/cts rate */ 600 series, /* 11n rate series */ 601 4, /* number of series */ 602 flags); 603 604 /* Set burst duration */ 605 /* 606 * This is only required when doing 11n burst, not aggregation 607 * ie, if there's a second frame in a RIFS or A-MPDU burst 608 * w/ >1 A-MPDU frame bursting back to back. 609 * Normal A-MPDU doesn't do bursting -between- aggregates. 610 * 611 * .. and it's highly likely this won't ever be implemented 612 */ 613 //ath_hal_set11nburstduration(ah, ds, 8192); 614} 615 616/* 617 * Form an aggregate packet list. 618 * 619 * This function enforces the aggregate restrictions/requirements. 620 * 621 * These are: 622 * 623 * + The aggregate size maximum (64k for AR9160 and later, 8K for 624 * AR5416 when doing RTS frame protection.) 625 * + Maximum number of sub-frames for an aggregate 626 * + The aggregate delimiter size, giving MACs time to do whatever is 627 * needed before each frame 628 * + Enforce the BAW limit 629 * 630 * Each descriptor queued should have the DMA setup. 631 * The rate series, descriptor setup, linking, etc is all done 632 * externally. This routine simply chains them together. 633 * ath_tx_setds_11n() will take care of configuring the per- 634 * descriptor setup, and ath_buf_set_rate() will configure the 635 * rate control. 636 * 637 * The TID lock is required for the entirety of this function. 638 * 639 * If some code in another thread adds to the head of this 640 * list, very strange behaviour will occur. Since retransmission is the 641 * only reason this will occur, and this routine is designed to be called 642 * from within the scheduler task, it won't ever clash with the completion 643 * task. 644 * 645 * So if you want to call this from an upper layer context (eg, to direct- 646 * dispatch aggregate frames to the hardware), please keep this in mind. 647 */ 648ATH_AGGR_STATUS 649ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 650 struct ath_tid *tid, ath_bufhead *bf_q) 651{ 652 //struct ieee80211_node *ni = &an->an_node; 653 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 654 int nframes = 0; 655 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 656 struct ieee80211_tx_ampdu *tap; 657 int status = ATH_AGGR_DONE; 658 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 659 int prev_al = 0; /* XXX also for AR5416 burst */ 660 661 ATH_TX_LOCK_ASSERT(sc); 662 663 tap = ath_tx_get_tx_tid(an, tid->tid); 664 if (tap == NULL) { 665 status = ATH_AGGR_ERROR; 666 goto finish; 667 } 668 669 h_baw = tap->txa_wnd / 2; 670 671 for (;;) { 672 bf = ATH_TID_FIRST(tid); 673 if (bf_first == NULL) 674 bf_first = bf; 675 if (bf == NULL) { 676 status = ATH_AGGR_DONE; 677 break; 678 } else { 679 /* 680 * It's the first frame; 681 * set the aggregation limit based on the 682 * rate control decision that has been made. 683 */ 684 aggr_limit = ath_get_aggr_limit(sc, bf_first); 685 } 686 687 /* Set this early just so things don't get confused */ 688 bf->bf_next = NULL; 689 690 /* 691 * Don't unlock the tid lock until we're sure we are going 692 * to queue this frame. 693 */ 694 695 /* 696 * If the frame doesn't have a sequence number that we're 697 * tracking in the BAW (eg NULL QOS data frame), we can't 698 * aggregate it. Stop the aggregation process; the sender 699 * can then TX what's in the list thus far and then 700 * TX the frame individually. 701 */ 702 if (! bf->bf_state.bfs_dobaw) { 703 status = ATH_AGGR_NONAGGR; 704 break; 705 } 706 707 /* 708 * If any of the rates are non-HT, this packet 709 * can't be aggregated. 710 * XXX TODO: add a bf_state flag which gets marked 711 * if any active rate is non-HT. 712 */ 713 714 /* 715 * do not exceed aggregation limit 716 */ 717 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 718 if (nframes && 719 (aggr_limit < (al + bpad + al_delta + prev_al))) { 720 status = ATH_AGGR_LIMITED; 721 break; 722 } 723 724 /* 725 * If RTS/CTS is set on the first frame, enforce 726 * the RTS aggregate limit. 727 */ 728 if (bf_first->bf_state.bfs_txflags & 729 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 730 if (nframes && 731 (sc->sc_rts_aggr_limit < 732 (al + bpad + al_delta + prev_al))) { 733 status = ATH_AGGR_8K_LIMITED; 734 break; 735 } 736 } 737 738 /* 739 * Do not exceed subframe limit. 740 */ 741 if ((nframes + prev_frames) >= MIN((h_baw), 742 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 743 status = ATH_AGGR_LIMITED; 744 break; 745 } 746 747 /* 748 * If the current frame has an RTS/CTS configuration 749 * that differs from the first frame, override the 750 * subsequent frame with this config. 751 */ 752 bf->bf_state.bfs_txflags &= 753 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 754 bf->bf_state.bfs_txflags |= 755 bf_first->bf_state.bfs_txflags & 756 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 757 758 /* 759 * If the packet has a sequence number, do not 760 * step outside of the block-ack window. 761 */ 762 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 763 SEQNO(bf->bf_state.bfs_seqno))) { 764 status = ATH_AGGR_BAW_CLOSED; 765 break; 766 } 767 768 /* 769 * this packet is part of an aggregate. 770 */ 771 ATH_TID_REMOVE(tid, bf, bf_list); 772 773 /* The TID lock is required for the BAW update */ 774 ath_tx_addto_baw(sc, an, tid, bf); 775 bf->bf_state.bfs_addedbaw = 1; 776 777 /* 778 * XXX enforce ACK for aggregate frames (this needs to be 779 * XXX handled more gracefully? 780 */ 781 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 782 device_printf(sc->sc_dev, 783 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 784 __func__); 785 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 786 } 787 788 /* 789 * Add the now owned buffer (which isn't 790 * on the software TXQ any longer) to our 791 * aggregate frame list. 792 */ 793 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 794 nframes ++; 795 796 /* Completion handler */ 797 bf->bf_comp = ath_tx_aggr_comp; 798 799 /* 800 * add padding for previous frame to aggregation length 801 */ 802 al += bpad + al_delta; 803 804 /* 805 * Calculate delimiters needed for the current frame 806 */ 807 bf->bf_state.bfs_ndelim = 808 ath_compute_num_delims(sc, bf_first, 809 bf->bf_state.bfs_pktlen); 810 811 /* 812 * Calculate the padding needed from this set of delimiters, 813 * used when calculating if the next frame will fit in 814 * the aggregate. 815 */ 816 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 817 818 /* 819 * Chain the buffers together 820 */ 821 if (bf_prev) 822 bf_prev->bf_next = bf; 823 bf_prev = bf; 824 825 /* 826 * XXX TODO: if any sub-frames have RTS/CTS enabled; 827 * enable it for the entire aggregate. 828 */ 829 830#if 0 831 /* 832 * terminate aggregation on a small packet boundary 833 */ 834 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 835 status = ATH_AGGR_SHORTPKT; 836 break; 837 } 838#endif 839 840 } 841 842finish: 843 /* 844 * Just in case the list was empty when we tried to 845 * dequeue a packet .. 846 */ 847 if (bf_first) { 848 bf_first->bf_state.bfs_al = al; 849 bf_first->bf_state.bfs_nframes = nframes; 850 } 851 return status; 852} 853