if_ath_tx_ht.c revision 238839
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 238839 2012-07-27 11:43:10Z 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 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 353 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 354 __func__, pktlen, ndelim, mpdudensity); 355 356 /* 357 * If the MPDU density is 0, we can return here. 358 * Otherwise, we need to convert the desired mpdudensity 359 * into a byte length, based on the rate in the subframe. 360 */ 361 if (mpdudensity == 0) 362 return ndelim; 363 364 /* 365 * Convert desired mpdu density from microeconds to bytes based 366 * on highest rate in rate series (i.e. first rate) to determine 367 * required minimum length for subframe. Take into account 368 * whether high rate is 20 or 40Mhz and half or full GI. 369 */ 370 rix = first_bf->bf_state.bfs_rc[0].rix; 371 rc = rt->info[rix].rateCode; 372 flags = first_bf->bf_state.bfs_rc[0].flags; 373 width = !! (flags & ATH_RC_CW40_FLAG); 374 half_gi = !! (flags & ATH_RC_SGI_FLAG); 375 376 /* 377 * mpdudensity is in 1/100th of a usec, so divide by 100 378 */ 379 if (half_gi) 380 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 381 else 382 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 383 nsymbols /= 100; 384 385 if (nsymbols == 0) 386 nsymbols = 1; 387 388 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 389 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 390 391 /* 392 * Min length is the minimum frame length for the 393 * required MPDU density. 394 */ 395 if (pktlen < minlen) { 396 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 397 ndelim = MAX(mindelim, ndelim); 398 } 399 400 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 401 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 402 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 403 404 return ndelim; 405} 406 407/* 408 * Fetch the aggregation limit. 409 * 410 * It's the lowest of the four rate series 4ms frame length. 411 */ 412static int 413ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 414{ 415 int amin = 65530; 416 int i; 417 418 for (i = 0; i < ATH_RC_NUM; i++) { 419 if (bf->bf_state.bfs_rc[i].tries == 0) 420 continue; 421 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 422 } 423 424 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 425 __func__, amin); 426 427 return amin; 428} 429 430/* 431 * Setup a 11n rate series structure 432 * 433 * This should be called for both legacy and MCS rates. 434 * 435 * It, along with ath_buf_set_rate, must be called -after- a burst 436 * or aggregate is setup. 437 */ 438static void 439ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 440 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 441{ 442 struct ieee80211com *ic = ni->ni_ic; 443 struct ath_hal *ah = sc->sc_ah; 444 HAL_BOOL shortPreamble = AH_FALSE; 445 const HAL_RATE_TABLE *rt = sc->sc_currates; 446 int i; 447 int pktlen; 448 int flags = bf->bf_state.bfs_txflags; 449 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 450 451 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 452 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 453 shortPreamble = AH_TRUE; 454 455 /* 456 * If this is the first frame in an aggregate series, 457 * use the aggregate length. 458 */ 459 if (bf->bf_state.bfs_aggr) 460 pktlen = bf->bf_state.bfs_al; 461 else 462 pktlen = bf->bf_state.bfs_pktlen; 463 464 /* 465 * XXX TODO: modify this routine to use the bfs_rc[x].flags 466 * XXX fields. 467 */ 468 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 469 for (i = 0; i < ATH_RC_NUM; i++) { 470 /* Only set flags for actual TX attempts */ 471 if (rc[i].tries == 0) 472 continue; 473 474 series[i].Tries = rc[i].tries; 475 476 /* 477 * XXX this isn't strictly correct - sc_txchainmask 478 * XXX isn't the currently active chainmask; 479 * XXX it's the interface chainmask at startup. 480 * XXX It's overridden in the HAL rate scenario function 481 * XXX for now. 482 */ 483 series[i].ChSel = sc->sc_txchainmask; 484 485 if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 486 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 487 488 /* 489 * Transmit 40MHz frames only if the node has negotiated 490 * it rather than whether the node is capable of it or not. 491 * It's subtly different in the hostap case. 492 */ 493 if (ni->ni_chw == 40) 494 series[i].RateFlags |= HAL_RATESERIES_2040; 495 496 /* 497 * Set short-GI only if the node has advertised it 498 * the channel width is suitable, and we support it. 499 * We don't currently have a "negotiated" set of bits - 500 * ni_htcap is what the remote end sends, not what this 501 * node is capable of. 502 */ 503 if (ni->ni_chw == 40 && 504 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 505 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 506 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 507 508 if (ni->ni_chw == 20 && 509 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 510 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 511 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 512 513 series[i].Rate = rt->info[rc[i].rix].rateCode; 514 series[i].RateIndex = rc[i].rix; 515 series[i].tx_power_cap = 0x3f; /* XXX for now */ 516 517 /* 518 * PktDuration doesn't include slot, ACK, RTS, etc timing - 519 * it's just the packet duration 520 */ 521 if (series[i].Rate & IEEE80211_RATE_MCS) { 522 series[i].PktDuration = 523 ath_computedur_ht(pktlen 524 , series[i].Rate 525 , HT_RC_2_STREAMS(series[i].Rate) 526 , series[i].RateFlags & HAL_RATESERIES_2040 527 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 528 } else { 529 if (shortPreamble) 530 series[i].Rate |= 531 rt->info[rc[i].rix].shortPreamble; 532 series[i].PktDuration = ath_hal_computetxtime(ah, 533 rt, pktlen, rc[i].rix, shortPreamble); 534 } 535 } 536} 537 538#if 0 539static void 540ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 541{ 542 int i; 543 for (i = 0; i < ATH_RC_NUM; i++) { 544 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 545 "pktDuration %d; chSel %d; rateFlags %x\n", 546 i, 547 series[i].Rate, 548 series[i].Tries, 549 series[i].PktDuration, 550 series[i].ChSel, 551 series[i].RateFlags); 552 } 553} 554#endif 555 556/* 557 * Setup the 11n rate scenario and burst duration for the given TX descriptor 558 * list. 559 * 560 * This isn't useful for sending beacon frames, which has different needs 561 * wrt what's passed into the rate scenario function. 562 */ 563 564void 565ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 566 struct ath_buf *bf) 567{ 568 HAL_11N_RATE_SERIES series[4]; 569 struct ath_desc *ds = bf->bf_desc; 570 struct ath_desc *lastds = NULL; 571 struct ath_hal *ah = sc->sc_ah; 572 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 573 int ctsrate = bf->bf_state.bfs_ctsrate; 574 int flags = bf->bf_state.bfs_txflags; 575 576 /* Setup rate scenario */ 577 memset(&series, 0, sizeof(series)); 578 579 ath_rateseries_setup(sc, ni, bf, series); 580 581 /* Enforce AR5416 aggregate limit - can't do RTS w/ an agg frame > 8k */ 582 583 /* Enforce RTS and CTS are mutually exclusive */ 584 585 /* Get a pointer to the last tx descriptor in the list */ 586 lastds = bf->bf_lastds; 587 588#if 0 589 printf("pktlen: %d; flags 0x%x\n", pktlen, flags); 590 ath_rateseries_print(sc, series); 591#endif 592 593 /* Set rate scenario */ 594 /* 595 * Note: Don't allow hardware to override the duration on 596 * ps-poll packets. 597 */ 598 ath_hal_set11nratescenario(ah, ds, 599 !is_pspoll, /* whether to override the duration or not */ 600 ctsrate, /* rts/cts rate */ 601 series, /* 11n rate series */ 602 4, /* number of series */ 603 flags); 604 605 /* Setup the last descriptor in the chain */ 606 /* 607 * XXX Why is this done here, and not in the upper layer? 608 * The rate control code stores a copy of the RC info in 609 * the last descriptor as well as the first, then uses 610 * the shadow copy in the last descriptor to see what the RC 611 * decisions were. I'm not sure why; perhaps earlier hardware 612 * overwrote the first descriptor contents. 613 * 614 * In the 802.11n case, it also clears the moreaggr/delim 615 * fields. Again, this should be done by the caller of 616 * ath_buf_set_rate(). 617 */ 618 ath_hal_setuplasttxdesc(ah, lastds, ds); 619 620 /* Set burst duration */ 621 /* 622 * This is only required when doing 11n burst, not aggregation 623 * ie, if there's a second frame in a RIFS or A-MPDU burst 624 * w/ >1 A-MPDU frame bursting back to back. 625 * Normal A-MPDU doesn't do bursting -between- aggregates. 626 * 627 * .. and it's highly likely this won't ever be implemented 628 */ 629 //ath_hal_set11nburstduration(ah, ds, 8192); 630} 631 632/* 633 * Form an aggregate packet list. 634 * 635 * This function enforces the aggregate restrictions/requirements. 636 * 637 * These are: 638 * 639 * + The aggregate size maximum (64k for AR9160 and later, 8K for 640 * AR5416 when doing RTS frame protection.) 641 * + Maximum number of sub-frames for an aggregate 642 * + The aggregate delimiter size, giving MACs time to do whatever is 643 * needed before each frame 644 * + Enforce the BAW limit 645 * 646 * Each descriptor queued should have the DMA setup. 647 * The rate series, descriptor setup, linking, etc is all done 648 * externally. This routine simply chains them together. 649 * ath_tx_setds_11n() will take care of configuring the per- 650 * descriptor setup, and ath_buf_set_rate() will configure the 651 * rate control. 652 * 653 * The TID lock is required for the entirety of this function. 654 * 655 * If some code in another thread adds to the head of this 656 * list, very strange behaviour will occur. Since retransmission is the 657 * only reason this will occur, and this routine is designed to be called 658 * from within the scheduler task, it won't ever clash with the completion 659 * task. 660 * 661 * So if you want to call this from an upper layer context (eg, to direct- 662 * dispatch aggregate frames to the hardware), please keep this in mind. 663 */ 664ATH_AGGR_STATUS 665ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 666 struct ath_tid *tid, ath_bufhead *bf_q) 667{ 668 //struct ieee80211_node *ni = &an->an_node; 669 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 670 int nframes = 0; 671 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 672 struct ieee80211_tx_ampdu *tap; 673 int status = ATH_AGGR_DONE; 674 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 675 int prev_al = 0; /* XXX also for AR5416 burst */ 676 677 ATH_TXQ_LOCK_ASSERT(sc->sc_ac2q[tid->ac]); 678 679 tap = ath_tx_get_tx_tid(an, tid->tid); 680 if (tap == NULL) { 681 status = ATH_AGGR_ERROR; 682 goto finish; 683 } 684 685 h_baw = tap->txa_wnd / 2; 686 687 for (;;) { 688 bf = TAILQ_FIRST(&tid->axq_q); 689 if (bf_first == NULL) 690 bf_first = bf; 691 if (bf == NULL) { 692 status = ATH_AGGR_DONE; 693 break; 694 } else { 695 /* 696 * It's the first frame; 697 * set the aggregation limit based on the 698 * rate control decision that has been made. 699 */ 700 aggr_limit = ath_get_aggr_limit(sc, bf_first); 701 } 702 703 /* Set this early just so things don't get confused */ 704 bf->bf_next = NULL; 705 706 /* 707 * Don't unlock the tid lock until we're sure we are going 708 * to queue this frame. 709 */ 710 711 /* 712 * If the frame doesn't have a sequence number that we're 713 * tracking in the BAW (eg NULL QOS data frame), we can't 714 * aggregate it. Stop the aggregation process; the sender 715 * can then TX what's in the list thus far and then 716 * TX the frame individually. 717 */ 718 if (! bf->bf_state.bfs_dobaw) { 719 status = ATH_AGGR_NONAGGR; 720 break; 721 } 722 723 /* 724 * If any of the rates are non-HT, this packet 725 * can't be aggregated. 726 * XXX TODO: add a bf_state flag which gets marked 727 * if any active rate is non-HT. 728 */ 729 730 /* 731 * do not exceed aggregation limit 732 */ 733 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 734 if (nframes && 735 (aggr_limit < (al + bpad + al_delta + prev_al))) { 736 status = ATH_AGGR_LIMITED; 737 break; 738 } 739 740 /* 741 * If RTS/CTS is set on the first frame, enforce 742 * the RTS aggregate limit. 743 */ 744 if (bf_first->bf_state.bfs_txflags & 745 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 746 if (nframes && 747 (sc->sc_rts_aggr_limit < 748 (al + bpad + al_delta + prev_al))) { 749 status = ATH_AGGR_8K_LIMITED; 750 break; 751 } 752 } 753 754 /* 755 * Do not exceed subframe limit. 756 */ 757 if ((nframes + prev_frames) >= MIN((h_baw), 758 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 759 status = ATH_AGGR_LIMITED; 760 break; 761 } 762 763 /* 764 * If the current frame has an RTS/CTS configuration 765 * that differs from the first frame, override the 766 * subsequent frame with this config. 767 */ 768 bf->bf_state.bfs_txflags &= 769 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 770 bf->bf_state.bfs_txflags |= 771 bf_first->bf_state.bfs_txflags & 772 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 773 774 /* 775 * If the packet has a sequence number, do not 776 * step outside of the block-ack window. 777 */ 778 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 779 SEQNO(bf->bf_state.bfs_seqno))) { 780 status = ATH_AGGR_BAW_CLOSED; 781 break; 782 } 783 784 /* 785 * this packet is part of an aggregate. 786 */ 787 ATH_TXQ_REMOVE(tid, bf, bf_list); 788 789 /* The TID lock is required for the BAW update */ 790 ath_tx_addto_baw(sc, an, tid, bf); 791 bf->bf_state.bfs_addedbaw = 1; 792 793 /* 794 * XXX enforce ACK for aggregate frames (this needs to be 795 * XXX handled more gracefully? 796 */ 797 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 798 device_printf(sc->sc_dev, 799 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 800 __func__); 801 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 802 } 803 804 /* 805 * Add the now owned buffer (which isn't 806 * on the software TXQ any longer) to our 807 * aggregate frame list. 808 */ 809 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 810 nframes ++; 811 812 /* Completion handler */ 813 bf->bf_comp = ath_tx_aggr_comp; 814 815 /* 816 * add padding for previous frame to aggregation length 817 */ 818 al += bpad + al_delta; 819 820 /* 821 * Calculate delimiters needed for the current frame 822 */ 823 bf->bf_state.bfs_ndelim = 824 ath_compute_num_delims(sc, bf_first, 825 bf->bf_state.bfs_pktlen); 826 827 /* 828 * Calculate the padding needed from this set of delimiters, 829 * used when calculating if the next frame will fit in 830 * the aggregate. 831 */ 832 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 833 834 /* 835 * Chain the buffers together 836 */ 837 if (bf_prev) 838 bf_prev->bf_next = bf; 839 bf_prev = bf; 840 841 /* 842 * XXX TODO: if any sub-frames have RTS/CTS enabled; 843 * enable it for the entire aggregate. 844 */ 845 846#if 0 847 /* 848 * terminate aggregation on a small packet boundary 849 */ 850 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 851 status = ATH_AGGR_SHORTPKT; 852 break; 853 } 854#endif 855 856 } 857 858finish: 859 /* 860 * Just in case the list was empty when we tried to 861 * dequeue a packet .. 862 */ 863 if (bf_first) { 864 bf_first->bf_state.bfs_al = al; 865 bf_first->bf_state.bfs_nframes = nframes; 866 } 867 return status; 868} 869