if_ath_tx_ht.c revision 302408
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: stable/11/sys/dev/ath/if_ath_tx_ht.c 302392 2016-07-07 17:22:13Z 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 ieee80211vap *vap = ni->ni_vap; 226 struct ieee80211com *ic = ni->ni_ic; 227 const HAL_RATE_TABLE *rt = sc->sc_currates; 228 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 229 uint8_t rate; 230 int i; 231 int do_ldpc; 232 int do_stbc; 233 234 /* 235 * We only do LDPC if the rate is 11n, both we and the 236 * receiver support LDPC and it's enabled. 237 * 238 * It's a global flag, not a per-try flag, so we clear 239 * it if any of the rate entries aren't 11n. 240 */ 241 do_ldpc = 0; 242 if ((ni->ni_vap->iv_htcaps & IEEE80211_HTCAP_LDPC) && 243 (ni->ni_htcap & IEEE80211_HTCAP_LDPC)) 244 do_ldpc = 1; 245 do_stbc = 0; 246 247 for (i = 0; i < ATH_RC_NUM; i++) { 248 rc[i].flags = 0; 249 if (rc[i].tries == 0) 250 continue; 251 252 rate = rt->info[rc[i].rix].rateCode; 253 254 /* 255 * Only enable short preamble for legacy rates 256 */ 257 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream) 258 rate |= rt->info[rc[i].rix].shortPreamble; 259 260 /* 261 * Save this, used by the TX and completion code 262 */ 263 rc[i].ratecode = rate; 264 265 if (bf->bf_state.bfs_txflags & 266 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 267 rc[i].flags |= ATH_RC_RTSCTS_FLAG; 268 269 /* 270 * If we can't do LDPC, don't. 271 */ 272 if (! IS_HT_RATE(rate)) 273 do_ldpc = 0; 274 275 /* Only enable shortgi, 2040, dual-stream if HT is set */ 276 if (IS_HT_RATE(rate)) { 277 rc[i].flags |= ATH_RC_HT_FLAG; 278 279 if (ni->ni_chw == 40) 280 rc[i].flags |= ATH_RC_CW40_FLAG; 281 282 if (ni->ni_chw == 40 && 283 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 284 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40 && 285 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40) 286 rc[i].flags |= ATH_RC_SGI_FLAG; 287 288 if (ni->ni_chw == 20 && 289 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 290 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20 && 291 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20) 292 rc[i].flags |= ATH_RC_SGI_FLAG; 293 294 /* 295 * If we have STBC TX enabled and the receiver 296 * can receive (at least) 1 stream STBC, AND it's 297 * MCS 0-7, AND we have at least two chains enabled, 298 * enable STBC. 299 * 300 * XXX TODO: .. and the rate is an 11n rate? 301 */ 302 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC && 303 ni->ni_vap->iv_flags_ht & IEEE80211_FHT_STBC_TX && 304 ni->ni_htcap & IEEE80211_HTCAP_RXSTBC_1STREAM && 305 (sc->sc_cur_txchainmask > 1) && 306 HT_RC_2_STREAMS(rate) == 1) { 307 rc[i].flags |= ATH_RC_STBC_FLAG; 308 do_stbc = 1; 309 } 310 311 /* 312 * Dual / Triple stream rate? 313 */ 314 if (HT_RC_2_STREAMS(rate) == 2) 315 rc[i].flags |= ATH_RC_DS_FLAG; 316 else if (HT_RC_2_STREAMS(rate) == 3) 317 rc[i].flags |= ATH_RC_TS_FLAG; 318 } 319 320 /* 321 * Calculate the maximum TX power cap for the current 322 * node. 323 */ 324 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni); 325 326 /* 327 * Calculate the maximum 4ms frame length based 328 * on the MCS rate, SGI and channel width flags. 329 */ 330 if ((rc[i].flags & ATH_RC_HT_FLAG) && 331 (HT_RC_2_MCS(rate) < 32)) { 332 int j; 333 if (rc[i].flags & ATH_RC_CW40_FLAG) { 334 if (rc[i].flags & ATH_RC_SGI_FLAG) 335 j = MCS_HT40_SGI; 336 else 337 j = MCS_HT40; 338 } else { 339 if (rc[i].flags & ATH_RC_SGI_FLAG) 340 j = MCS_HT20_SGI; 341 else 342 j = MCS_HT20; 343 } 344 rc[i].max4msframelen = 345 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)]; 346 } else 347 rc[i].max4msframelen = 0; 348 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 349 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n", 350 __func__, i, rate, rc[i].flags, rc[i].max4msframelen); 351 } 352 353 /* 354 * LDPC is a global flag, so ... 355 */ 356 if (do_ldpc) { 357 bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC; 358 sc->sc_stats.ast_tx_ldpc++; 359 } 360 361 if (do_stbc) { 362 sc->sc_stats.ast_tx_stbc++; 363 } 364} 365 366/* 367 * Return the number of delimiters to be added to 368 * meet the minimum required mpdudensity. 369 * 370 * Caller should make sure that the rate is HT. 371 * 372 * TODO: is this delimiter calculation supposed to be the 373 * total frame length, the hdr length, the data length (including 374 * delimiters, padding, CRC, etc) or ? 375 * 376 * TODO: this should ensure that the rate control information 377 * HAS been setup for the first rate. 378 * 379 * TODO: ensure this is only called for MCS rates. 380 * 381 * TODO: enforce MCS < 31 382 */ 383static int 384ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 385 uint16_t pktlen) 386{ 387 const HAL_RATE_TABLE *rt = sc->sc_currates; 388 struct ieee80211_node *ni = first_bf->bf_node; 389 struct ieee80211vap *vap = ni->ni_vap; 390 int ndelim, mindelim = 0; 391 int mpdudensity; /* in 1/100'th of a microsecond */ 392 uint8_t rc, rix, flags; 393 int width, half_gi; 394 uint32_t nsymbits, nsymbols; 395 uint16_t minlen; 396 397 /* 398 * vap->iv_ampdu_density is a value, rather than the actual 399 * density. 400 */ 401 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16) 402 mpdudensity = 1600; /* maximum density */ 403 else 404 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density]; 405 406 /* Select standard number of delimiters based on frame length */ 407 ndelim = ATH_AGGR_GET_NDELIM(pktlen); 408 409 /* 410 * If encryption is enabled, add extra delimiters to let the 411 * crypto hardware catch up. This could be tuned per-MAC and 412 * per-rate, but for now we'll simply assume encryption is 413 * always enabled. 414 * 415 * Also note that the Atheros reference driver inserts two 416 * delimiters by default for pre-AR9380 peers. This will 417 * include "that" required delimiter. 418 */ 419 ndelim += ATH_AGGR_ENCRYPTDELIM; 420 421 /* 422 * For AR9380, there's a minimum number of delimeters 423 * required when doing RTS. 424 * 425 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and 426 * XXX (b) this is the first sub-frame in the aggregate. 427 */ 428 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR) 429 && ndelim < AH_FIRST_DESC_NDELIMS) 430 ndelim = AH_FIRST_DESC_NDELIMS; 431 432 /* 433 * If sc_delim_min_pad is non-zero, enforce it as the minimum 434 * pad delimiter count. 435 */ 436 if (sc->sc_delim_min_pad != 0) 437 ndelim = MAX(ndelim, sc->sc_delim_min_pad); 438 439 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 440 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 441 __func__, pktlen, ndelim, mpdudensity); 442 443 /* 444 * If the MPDU density is 0, we can return here. 445 * Otherwise, we need to convert the desired mpdudensity 446 * into a byte length, based on the rate in the subframe. 447 */ 448 if (mpdudensity == 0) 449 return ndelim; 450 451 /* 452 * Convert desired mpdu density from microeconds to bytes based 453 * on highest rate in rate series (i.e. first rate) to determine 454 * required minimum length for subframe. Take into account 455 * whether high rate is 20 or 40Mhz and half or full GI. 456 */ 457 rix = first_bf->bf_state.bfs_rc[0].rix; 458 rc = rt->info[rix].rateCode; 459 flags = first_bf->bf_state.bfs_rc[0].flags; 460 width = !! (flags & ATH_RC_CW40_FLAG); 461 half_gi = !! (flags & ATH_RC_SGI_FLAG); 462 463 /* 464 * mpdudensity is in 1/100th of a usec, so divide by 100 465 */ 466 if (half_gi) 467 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 468 else 469 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 470 nsymbols /= 100; 471 472 if (nsymbols == 0) 473 nsymbols = 1; 474 475 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 476 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 477 478 /* 479 * Min length is the minimum frame length for the 480 * required MPDU density. 481 */ 482 if (pktlen < minlen) { 483 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 484 ndelim = MAX(mindelim, ndelim); 485 } 486 487 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 488 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 489 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 490 491 return ndelim; 492} 493 494/* 495 * Fetch the aggregation limit. 496 * 497 * It's the lowest of the four rate series 4ms frame length. 498 */ 499static int 500ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 501{ 502 int amin = ATH_AGGR_MAXSIZE; 503 int i; 504 505 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE) 506 amin = sc->sc_aggr_limit; 507 508 for (i = 0; i < ATH_RC_NUM; i++) { 509 if (bf->bf_state.bfs_rc[i].tries == 0) 510 continue; 511 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 512 } 513 514 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 515 __func__, amin); 516 517 return amin; 518} 519 520/* 521 * Setup a 11n rate series structure 522 * 523 * This should be called for both legacy and MCS rates. 524 * 525 * This uses the rate series stuf from ath_tx_rate_fill_rcflags(). 526 * 527 * It, along with ath_buf_set_rate, must be called -after- a burst 528 * or aggregate is setup. 529 */ 530static void 531ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 532 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 533{ 534 struct ieee80211com *ic = ni->ni_ic; 535 struct ath_hal *ah = sc->sc_ah; 536 HAL_BOOL shortPreamble = AH_FALSE; 537 const HAL_RATE_TABLE *rt = sc->sc_currates; 538 int i; 539 int pktlen; 540 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 541 542 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 543 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 544 shortPreamble = AH_TRUE; 545 546 /* 547 * If this is the first frame in an aggregate series, 548 * use the aggregate length. 549 */ 550 if (bf->bf_state.bfs_aggr) 551 pktlen = bf->bf_state.bfs_al; 552 else 553 pktlen = bf->bf_state.bfs_pktlen; 554 555 /* 556 * XXX TODO: modify this routine to use the bfs_rc[x].flags 557 * XXX fields. 558 */ 559 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 560 for (i = 0; i < ATH_RC_NUM; i++) { 561 /* Only set flags for actual TX attempts */ 562 if (rc[i].tries == 0) 563 continue; 564 565 series[i].Tries = rc[i].tries; 566 567 /* 568 * XXX TODO: When the NIC is capable of three stream TX, 569 * transmit 1/2 stream rates on two streams. 570 * 571 * This reduces the power consumption of the NIC and 572 * keeps it within the PCIe slot power limits. 573 */ 574 series[i].ChSel = sc->sc_cur_txchainmask; 575 576 /* 577 * Setup rate and TX power cap for this series. 578 */ 579 series[i].Rate = rt->info[rc[i].rix].rateCode; 580 series[i].RateIndex = rc[i].rix; 581 series[i].tx_power_cap = rc[i].tx_power_cap; 582 583 /* 584 * Enable RTS/CTS as appropriate. 585 */ 586 if (rc[i].flags & ATH_RC_RTSCTS_FLAG) 587 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 588 589 /* 590 * 11n rate? Update 11n flags. 591 */ 592 if (rc[i].flags & ATH_RC_HT_FLAG) { 593 if (rc[i].flags & ATH_RC_CW40_FLAG) 594 series[i].RateFlags |= HAL_RATESERIES_2040; 595 596 if (rc[i].flags & ATH_RC_SGI_FLAG) 597 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 598 599 if (rc[i].flags & ATH_RC_STBC_FLAG) 600 series[i].RateFlags |= HAL_RATESERIES_STBC; 601 } 602 603 /* 604 * TODO: If we're all doing 11n rates then we can set LDPC. 605 * If we've been asked to /do/ LDPC but we are handed a 606 * legacy rate, then we should complain. Loudly. 607 */ 608 609 /* 610 * PktDuration doesn't include slot, ACK, RTS, etc timing - 611 * it's just the packet duration 612 */ 613 if (rc[i].flags & ATH_RC_HT_FLAG) { 614 series[i].PktDuration = 615 ath_computedur_ht(pktlen 616 , series[i].Rate 617 , HT_RC_2_STREAMS(series[i].Rate) 618 , series[i].RateFlags & HAL_RATESERIES_2040 619 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 620 } else { 621 if (shortPreamble) 622 series[i].Rate |= 623 rt->info[rc[i].rix].shortPreamble; 624 series[i].PktDuration = ath_hal_computetxtime(ah, 625 rt, pktlen, rc[i].rix, shortPreamble); 626 } 627 } 628} 629 630#ifdef ATH_DEBUG 631static void 632ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 633{ 634 int i; 635 for (i = 0; i < ATH_RC_NUM; i++) { 636 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 637 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 638 i, 639 series[i].Rate, 640 series[i].Tries, 641 series[i].PktDuration, 642 series[i].ChSel, 643 series[i].tx_power_cap, 644 series[i].RateFlags); 645 } 646} 647#endif 648 649/* 650 * Setup the 11n rate scenario and burst duration for the given TX descriptor 651 * list. 652 * 653 * This isn't useful for sending beacon frames, which has different needs 654 * wrt what's passed into the rate scenario function. 655 */ 656void 657ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 658 struct ath_buf *bf) 659{ 660 HAL_11N_RATE_SERIES series[4]; 661 struct ath_desc *ds = bf->bf_desc; 662 struct ath_hal *ah = sc->sc_ah; 663 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 664 int ctsrate = bf->bf_state.bfs_ctsrate; 665 int flags = bf->bf_state.bfs_txflags; 666 667 /* Setup rate scenario */ 668 memset(&series, 0, sizeof(series)); 669 670 ath_rateseries_setup(sc, ni, bf, series); 671 672#ifdef ATH_DEBUG 673 if (sc->sc_debug & ATH_DEBUG_XMIT) 674 ath_rateseries_print(sc, series); 675#endif 676 677 /* Set rate scenario */ 678 /* 679 * Note: Don't allow hardware to override the duration on 680 * ps-poll packets. 681 */ 682 ath_hal_set11nratescenario(ah, ds, 683 !is_pspoll, /* whether to override the duration or not */ 684 ctsrate, /* rts/cts rate */ 685 series, /* 11n rate series */ 686 4, /* number of series */ 687 flags); 688 689 /* Set burst duration */ 690 /* 691 * This is only required when doing 11n burst, not aggregation 692 * ie, if there's a second frame in a RIFS or A-MPDU burst 693 * w/ >1 A-MPDU frame bursting back to back. 694 * Normal A-MPDU doesn't do bursting -between- aggregates. 695 * 696 * .. and it's highly likely this won't ever be implemented 697 */ 698 //ath_hal_set11nburstduration(ah, ds, 8192); 699} 700 701/* 702 * Form an aggregate packet list. 703 * 704 * This function enforces the aggregate restrictions/requirements. 705 * 706 * These are: 707 * 708 * + The aggregate size maximum (64k for AR9160 and later, 8K for 709 * AR5416 when doing RTS frame protection.) 710 * + Maximum number of sub-frames for an aggregate 711 * + The aggregate delimiter size, giving MACs time to do whatever is 712 * needed before each frame 713 * + Enforce the BAW limit 714 * 715 * Each descriptor queued should have the DMA setup. 716 * The rate series, descriptor setup, linking, etc is all done 717 * externally. This routine simply chains them together. 718 * ath_tx_setds_11n() will take care of configuring the per- 719 * descriptor setup, and ath_buf_set_rate() will configure the 720 * rate control. 721 * 722 * The TID lock is required for the entirety of this function. 723 * 724 * If some code in another thread adds to the head of this 725 * list, very strange behaviour will occur. Since retransmission is the 726 * only reason this will occur, and this routine is designed to be called 727 * from within the scheduler task, it won't ever clash with the completion 728 * task. 729 * 730 * So if you want to call this from an upper layer context (eg, to direct- 731 * dispatch aggregate frames to the hardware), please keep this in mind. 732 */ 733ATH_AGGR_STATUS 734ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 735 struct ath_tid *tid, ath_bufhead *bf_q) 736{ 737 //struct ieee80211_node *ni = &an->an_node; 738 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 739 int nframes = 0; 740 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 741 struct ieee80211_tx_ampdu *tap; 742 int status = ATH_AGGR_DONE; 743 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 744 int prev_al = 0; /* XXX also for AR5416 burst */ 745 746 ATH_TX_LOCK_ASSERT(sc); 747 748 tap = ath_tx_get_tx_tid(an, tid->tid); 749 if (tap == NULL) { 750 status = ATH_AGGR_ERROR; 751 goto finish; 752 } 753 754 h_baw = tap->txa_wnd / 2; 755 756 for (;;) { 757 bf = ATH_TID_FIRST(tid); 758 if (bf_first == NULL) 759 bf_first = bf; 760 if (bf == NULL) { 761 status = ATH_AGGR_DONE; 762 break; 763 } else { 764 /* 765 * It's the first frame; 766 * set the aggregation limit based on the 767 * rate control decision that has been made. 768 */ 769 aggr_limit = ath_get_aggr_limit(sc, bf_first); 770 } 771 772 /* Set this early just so things don't get confused */ 773 bf->bf_next = NULL; 774 775 /* 776 * If the frame doesn't have a sequence number that we're 777 * tracking in the BAW (eg NULL QOS data frame), we can't 778 * aggregate it. Stop the aggregation process; the sender 779 * can then TX what's in the list thus far and then 780 * TX the frame individually. 781 */ 782 if (! bf->bf_state.bfs_dobaw) { 783 status = ATH_AGGR_NONAGGR; 784 break; 785 } 786 787 /* 788 * If any of the rates are non-HT, this packet 789 * can't be aggregated. 790 * XXX TODO: add a bf_state flag which gets marked 791 * if any active rate is non-HT. 792 */ 793 794 /* 795 * do not exceed aggregation limit 796 */ 797 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 798 if (nframes && 799 (aggr_limit < (al + bpad + al_delta + prev_al))) { 800 status = ATH_AGGR_LIMITED; 801 break; 802 } 803 804 /* 805 * If RTS/CTS is set on the first frame, enforce 806 * the RTS aggregate limit. 807 */ 808 if (bf_first->bf_state.bfs_txflags & 809 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 810 if (nframes && 811 (sc->sc_rts_aggr_limit < 812 (al + bpad + al_delta + prev_al))) { 813 status = ATH_AGGR_8K_LIMITED; 814 break; 815 } 816 } 817 818 /* 819 * Do not exceed subframe limit. 820 */ 821 if ((nframes + prev_frames) >= MIN((h_baw), 822 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 823 status = ATH_AGGR_LIMITED; 824 break; 825 } 826 827 /* 828 * If the current frame has an RTS/CTS configuration 829 * that differs from the first frame, override the 830 * subsequent frame with this config. 831 */ 832 if (bf != bf_first) { 833 bf->bf_state.bfs_txflags &= 834 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 835 bf->bf_state.bfs_txflags |= 836 bf_first->bf_state.bfs_txflags & 837 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 838 } 839 840 /* 841 * If the packet has a sequence number, do not 842 * step outside of the block-ack window. 843 */ 844 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 845 SEQNO(bf->bf_state.bfs_seqno))) { 846 status = ATH_AGGR_BAW_CLOSED; 847 break; 848 } 849 850 /* 851 * this packet is part of an aggregate. 852 */ 853 ATH_TID_REMOVE(tid, bf, bf_list); 854 855 /* The TID lock is required for the BAW update */ 856 ath_tx_addto_baw(sc, an, tid, bf); 857 bf->bf_state.bfs_addedbaw = 1; 858 859 /* 860 * XXX enforce ACK for aggregate frames (this needs to be 861 * XXX handled more gracefully? 862 */ 863 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 864 device_printf(sc->sc_dev, 865 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 866 __func__); 867 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 868 } 869 870 /* 871 * Add the now owned buffer (which isn't 872 * on the software TXQ any longer) to our 873 * aggregate frame list. 874 */ 875 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 876 nframes ++; 877 878 /* Completion handler */ 879 bf->bf_comp = ath_tx_aggr_comp; 880 881 /* 882 * add padding for previous frame to aggregation length 883 */ 884 al += bpad + al_delta; 885 886 /* 887 * Calculate delimiters needed for the current frame 888 */ 889 bf->bf_state.bfs_ndelim = 890 ath_compute_num_delims(sc, bf_first, 891 bf->bf_state.bfs_pktlen); 892 893 /* 894 * Calculate the padding needed from this set of delimiters, 895 * used when calculating if the next frame will fit in 896 * the aggregate. 897 */ 898 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 899 900 /* 901 * Chain the buffers together 902 */ 903 if (bf_prev) 904 bf_prev->bf_next = bf; 905 bf_prev = bf; 906 907 /* 908 * If we're leaking frames, just return at this point; 909 * we've queued a single frame and we don't want to add 910 * any more. 911 */ 912 if (tid->an->an_leak_count) { 913 status = ATH_AGGR_LEAK_CLOSED; 914 break; 915 } 916 917#if 0 918 /* 919 * terminate aggregation on a small packet boundary 920 */ 921 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 922 status = ATH_AGGR_SHORTPKT; 923 break; 924 } 925#endif 926 927 } 928 929finish: 930 /* 931 * Just in case the list was empty when we tried to 932 * dequeue a packet .. 933 */ 934 if (bf_first) { 935 bf_first->bf_state.bfs_al = al; 936 bf_first->bf_state.bfs_nframes = nframes; 937 } 938 return status; 939} 940