if_ath_tx_ht.c revision 247087
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 247087 2013-02-21 06:38:49Z 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 * Also note that the Atheros reference driver inserts two 351 * delimiters by default for pre-AR9380 peers. This will 352 * include "that" required delimiter. 353 */ 354 ndelim += ATH_AGGR_ENCRYPTDELIM; 355 356 /* 357 * For AR9380, there's a minimum number of delimeters 358 * required when doing RTS. 359 * 360 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and 361 * XXX (b) this is the first sub-frame in the aggregate. 362 */ 363 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR) 364 && ndelim < AH_FIRST_DESC_NDELIMS) 365 ndelim = AH_FIRST_DESC_NDELIMS; 366 367 /* 368 * If sc_delim_min_pad is non-zero, enforce it as the minimum 369 * pad delimiter count. 370 */ 371 if (sc->sc_delim_min_pad != 0) 372 ndelim = MAX(ndelim, sc->sc_delim_min_pad); 373 374 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 375 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 376 __func__, pktlen, ndelim, mpdudensity); 377 378 /* 379 * If the MPDU density is 0, we can return here. 380 * Otherwise, we need to convert the desired mpdudensity 381 * into a byte length, based on the rate in the subframe. 382 */ 383 if (mpdudensity == 0) 384 return ndelim; 385 386 /* 387 * Convert desired mpdu density from microeconds to bytes based 388 * on highest rate in rate series (i.e. first rate) to determine 389 * required minimum length for subframe. Take into account 390 * whether high rate is 20 or 40Mhz and half or full GI. 391 */ 392 rix = first_bf->bf_state.bfs_rc[0].rix; 393 rc = rt->info[rix].rateCode; 394 flags = first_bf->bf_state.bfs_rc[0].flags; 395 width = !! (flags & ATH_RC_CW40_FLAG); 396 half_gi = !! (flags & ATH_RC_SGI_FLAG); 397 398 /* 399 * mpdudensity is in 1/100th of a usec, so divide by 100 400 */ 401 if (half_gi) 402 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 403 else 404 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 405 nsymbols /= 100; 406 407 if (nsymbols == 0) 408 nsymbols = 1; 409 410 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 411 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 412 413 /* 414 * Min length is the minimum frame length for the 415 * required MPDU density. 416 */ 417 if (pktlen < minlen) { 418 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 419 ndelim = MAX(mindelim, ndelim); 420 } 421 422 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 423 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 424 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 425 426 return ndelim; 427} 428 429/* 430 * Fetch the aggregation limit. 431 * 432 * It's the lowest of the four rate series 4ms frame length. 433 */ 434static int 435ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 436{ 437 int amin = ATH_AGGR_MAXSIZE; 438 int i; 439 440 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE) 441 amin = sc->sc_aggr_limit; 442 443 for (i = 0; i < ATH_RC_NUM; i++) { 444 if (bf->bf_state.bfs_rc[i].tries == 0) 445 continue; 446 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 447 } 448 449 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 450 __func__, amin); 451 452 return amin; 453} 454 455/* 456 * Setup a 11n rate series structure 457 * 458 * This should be called for both legacy and MCS rates. 459 * 460 * It, along with ath_buf_set_rate, must be called -after- a burst 461 * or aggregate is setup. 462 */ 463static void 464ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 465 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 466{ 467 struct ieee80211com *ic = ni->ni_ic; 468 struct ath_hal *ah = sc->sc_ah; 469 HAL_BOOL shortPreamble = AH_FALSE; 470 const HAL_RATE_TABLE *rt = sc->sc_currates; 471 int i; 472 int pktlen; 473 int flags = bf->bf_state.bfs_txflags; 474 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 475 476 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 477 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 478 shortPreamble = AH_TRUE; 479 480 /* 481 * If this is the first frame in an aggregate series, 482 * use the aggregate length. 483 */ 484 if (bf->bf_state.bfs_aggr) 485 pktlen = bf->bf_state.bfs_al; 486 else 487 pktlen = bf->bf_state.bfs_pktlen; 488 489 /* 490 * XXX TODO: modify this routine to use the bfs_rc[x].flags 491 * XXX fields. 492 */ 493 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 494 for (i = 0; i < ATH_RC_NUM; i++) { 495 /* Only set flags for actual TX attempts */ 496 if (rc[i].tries == 0) 497 continue; 498 499 series[i].Tries = rc[i].tries; 500 501 /* 502 * XXX this isn't strictly correct - sc_txchainmask 503 * XXX isn't the currently active chainmask; 504 * XXX it's the interface chainmask at startup. 505 * XXX It's overridden in the HAL rate scenario function 506 * XXX for now. 507 */ 508 /* 509 * XXX TODO: When the NIC is capable of three stream TX, 510 * transmit 1/2 stream rates on two streams. 511 * 512 * This reduces the power consumption of the NIC and 513 * keeps it within the PCIe slot power limits. 514 */ 515 series[i].ChSel = sc->sc_txchainmask; 516 517 if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 518 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 519 520 /* 521 * Transmit 40MHz frames only if the node has negotiated 522 * it rather than whether the node is capable of it or not. 523 * It's subtly different in the hostap case. 524 */ 525 if (ni->ni_chw == 40) 526 series[i].RateFlags |= HAL_RATESERIES_2040; 527 528 /* 529 * Set short-GI only if the node has advertised it 530 * the channel width is suitable, and we support it. 531 * We don't currently have a "negotiated" set of bits - 532 * ni_htcap is what the remote end sends, not what this 533 * node is capable of. 534 */ 535 if (ni->ni_chw == 40 && 536 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 537 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 538 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 539 540 if (ni->ni_chw == 20 && 541 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 542 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 543 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 544 545 series[i].Rate = rt->info[rc[i].rix].rateCode; 546 series[i].RateIndex = rc[i].rix; 547 series[i].tx_power_cap = 0x3f; /* XXX for now */ 548 549 /* 550 * PktDuration doesn't include slot, ACK, RTS, etc timing - 551 * it's just the packet duration 552 */ 553 if (series[i].Rate & IEEE80211_RATE_MCS) { 554 series[i].PktDuration = 555 ath_computedur_ht(pktlen 556 , series[i].Rate 557 , HT_RC_2_STREAMS(series[i].Rate) 558 , series[i].RateFlags & HAL_RATESERIES_2040 559 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 560 } else { 561 if (shortPreamble) 562 series[i].Rate |= 563 rt->info[rc[i].rix].shortPreamble; 564 series[i].PktDuration = ath_hal_computetxtime(ah, 565 rt, pktlen, rc[i].rix, shortPreamble); 566 } 567 } 568} 569 570#if 0 571static void 572ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 573{ 574 int i; 575 for (i = 0; i < ATH_RC_NUM; i++) { 576 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 577 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 578 i, 579 series[i].Rate, 580 series[i].Tries, 581 series[i].PktDuration, 582 series[i].ChSel, 583 series[i].tx_power_cap, 584 series[i].RateFlags); 585 } 586} 587#endif 588 589/* 590 * Setup the 11n rate scenario and burst duration for the given TX descriptor 591 * list. 592 * 593 * This isn't useful for sending beacon frames, which has different needs 594 * wrt what's passed into the rate scenario function. 595 */ 596void 597ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 598 struct ath_buf *bf) 599{ 600 HAL_11N_RATE_SERIES series[4]; 601 struct ath_desc *ds = bf->bf_desc; 602 struct ath_hal *ah = sc->sc_ah; 603 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 604 int ctsrate = bf->bf_state.bfs_ctsrate; 605 int flags = bf->bf_state.bfs_txflags; 606 607 /* Setup rate scenario */ 608 memset(&series, 0, sizeof(series)); 609 610 ath_rateseries_setup(sc, ni, bf, series); 611 612#if 0 613 ath_rateseries_print(sc, series); 614#endif 615 616 /* Set rate scenario */ 617 /* 618 * Note: Don't allow hardware to override the duration on 619 * ps-poll packets. 620 */ 621 ath_hal_set11nratescenario(ah, ds, 622 !is_pspoll, /* whether to override the duration or not */ 623 ctsrate, /* rts/cts rate */ 624 series, /* 11n rate series */ 625 4, /* number of series */ 626 flags); 627 628 /* Set burst duration */ 629 /* 630 * This is only required when doing 11n burst, not aggregation 631 * ie, if there's a second frame in a RIFS or A-MPDU burst 632 * w/ >1 A-MPDU frame bursting back to back. 633 * Normal A-MPDU doesn't do bursting -between- aggregates. 634 * 635 * .. and it's highly likely this won't ever be implemented 636 */ 637 //ath_hal_set11nburstduration(ah, ds, 8192); 638} 639 640/* 641 * Form an aggregate packet list. 642 * 643 * This function enforces the aggregate restrictions/requirements. 644 * 645 * These are: 646 * 647 * + The aggregate size maximum (64k for AR9160 and later, 8K for 648 * AR5416 when doing RTS frame protection.) 649 * + Maximum number of sub-frames for an aggregate 650 * + The aggregate delimiter size, giving MACs time to do whatever is 651 * needed before each frame 652 * + Enforce the BAW limit 653 * 654 * Each descriptor queued should have the DMA setup. 655 * The rate series, descriptor setup, linking, etc is all done 656 * externally. This routine simply chains them together. 657 * ath_tx_setds_11n() will take care of configuring the per- 658 * descriptor setup, and ath_buf_set_rate() will configure the 659 * rate control. 660 * 661 * The TID lock is required for the entirety of this function. 662 * 663 * If some code in another thread adds to the head of this 664 * list, very strange behaviour will occur. Since retransmission is the 665 * only reason this will occur, and this routine is designed to be called 666 * from within the scheduler task, it won't ever clash with the completion 667 * task. 668 * 669 * So if you want to call this from an upper layer context (eg, to direct- 670 * dispatch aggregate frames to the hardware), please keep this in mind. 671 */ 672ATH_AGGR_STATUS 673ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 674 struct ath_tid *tid, ath_bufhead *bf_q) 675{ 676 //struct ieee80211_node *ni = &an->an_node; 677 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 678 int nframes = 0; 679 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 680 struct ieee80211_tx_ampdu *tap; 681 int status = ATH_AGGR_DONE; 682 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 683 int prev_al = 0; /* XXX also for AR5416 burst */ 684 685 ATH_TX_LOCK_ASSERT(sc); 686 687 tap = ath_tx_get_tx_tid(an, tid->tid); 688 if (tap == NULL) { 689 status = ATH_AGGR_ERROR; 690 goto finish; 691 } 692 693 h_baw = tap->txa_wnd / 2; 694 695 for (;;) { 696 bf = ATH_TID_FIRST(tid); 697 if (bf_first == NULL) 698 bf_first = bf; 699 if (bf == NULL) { 700 status = ATH_AGGR_DONE; 701 break; 702 } else { 703 /* 704 * It's the first frame; 705 * set the aggregation limit based on the 706 * rate control decision that has been made. 707 */ 708 aggr_limit = ath_get_aggr_limit(sc, bf_first); 709 } 710 711 /* Set this early just so things don't get confused */ 712 bf->bf_next = NULL; 713 714 /* 715 * If the frame doesn't have a sequence number that we're 716 * tracking in the BAW (eg NULL QOS data frame), we can't 717 * aggregate it. Stop the aggregation process; the sender 718 * can then TX what's in the list thus far and then 719 * TX the frame individually. 720 */ 721 if (! bf->bf_state.bfs_dobaw) { 722 status = ATH_AGGR_NONAGGR; 723 break; 724 } 725 726 /* 727 * If any of the rates are non-HT, this packet 728 * can't be aggregated. 729 * XXX TODO: add a bf_state flag which gets marked 730 * if any active rate is non-HT. 731 */ 732 733 /* 734 * do not exceed aggregation limit 735 */ 736 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 737 if (nframes && 738 (aggr_limit < (al + bpad + al_delta + prev_al))) { 739 status = ATH_AGGR_LIMITED; 740 break; 741 } 742 743 /* 744 * If RTS/CTS is set on the first frame, enforce 745 * the RTS aggregate limit. 746 */ 747 if (bf_first->bf_state.bfs_txflags & 748 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 749 if (nframes && 750 (sc->sc_rts_aggr_limit < 751 (al + bpad + al_delta + prev_al))) { 752 status = ATH_AGGR_8K_LIMITED; 753 break; 754 } 755 } 756 757 /* 758 * Do not exceed subframe limit. 759 */ 760 if ((nframes + prev_frames) >= MIN((h_baw), 761 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 762 status = ATH_AGGR_LIMITED; 763 break; 764 } 765 766 /* 767 * If the current frame has an RTS/CTS configuration 768 * that differs from the first frame, override the 769 * subsequent frame with this config. 770 */ 771 if (bf != bf_first) { 772 bf->bf_state.bfs_txflags &= 773 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 774 bf->bf_state.bfs_txflags |= 775 bf_first->bf_state.bfs_txflags & 776 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 777 } 778 779 /* 780 * If the packet has a sequence number, do not 781 * step outside of the block-ack window. 782 */ 783 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 784 SEQNO(bf->bf_state.bfs_seqno))) { 785 status = ATH_AGGR_BAW_CLOSED; 786 break; 787 } 788 789 /* 790 * this packet is part of an aggregate. 791 */ 792 ATH_TID_REMOVE(tid, bf, bf_list); 793 794 /* The TID lock is required for the BAW update */ 795 ath_tx_addto_baw(sc, an, tid, bf); 796 bf->bf_state.bfs_addedbaw = 1; 797 798 /* 799 * XXX enforce ACK for aggregate frames (this needs to be 800 * XXX handled more gracefully? 801 */ 802 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 803 device_printf(sc->sc_dev, 804 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 805 __func__); 806 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 807 } 808 809 /* 810 * Add the now owned buffer (which isn't 811 * on the software TXQ any longer) to our 812 * aggregate frame list. 813 */ 814 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 815 nframes ++; 816 817 /* Completion handler */ 818 bf->bf_comp = ath_tx_aggr_comp; 819 820 /* 821 * add padding for previous frame to aggregation length 822 */ 823 al += bpad + al_delta; 824 825 /* 826 * Calculate delimiters needed for the current frame 827 */ 828 bf->bf_state.bfs_ndelim = 829 ath_compute_num_delims(sc, bf_first, 830 bf->bf_state.bfs_pktlen); 831 832 /* 833 * Calculate the padding needed from this set of delimiters, 834 * used when calculating if the next frame will fit in 835 * the aggregate. 836 */ 837 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 838 839 /* 840 * Chain the buffers together 841 */ 842 if (bf_prev) 843 bf_prev->bf_next = bf; 844 bf_prev = bf; 845 846 /* 847 * XXX TODO: if any sub-frames have RTS/CTS enabled; 848 * enable it for the entire aggregate. 849 */ 850 851#if 0 852 /* 853 * terminate aggregation on a small packet boundary 854 */ 855 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 856 status = ATH_AGGR_SHORTPKT; 857 break; 858 } 859#endif 860 861 } 862 863finish: 864 /* 865 * Just in case the list was empty when we tried to 866 * dequeue a packet .. 867 */ 868 if (bf_first) { 869 bf_first->bf_state.bfs_al = al; 870 bf_first->bf_state.bfs_nframes = nframes; 871 } 872 return status; 873} 874