1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 */ 31 32#include <sys/cdefs.h> 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_flags_ht & IEEE80211_FHT_LDPC_TX) && 243 (ni->ni_htcap & IEEE80211_HTCAP_LDPC)) 244 do_ldpc = 1; 245 246 /* 247 * The 11n duration calculation doesn't know about LDPC, 248 * so don't enable it for positioning. 249 */ 250 if (bf->bf_flags & ATH_BUF_TOA_PROBE) 251 do_ldpc = 0; 252 253 do_stbc = 0; 254 255 for (i = 0; i < ATH_RC_NUM; i++) { 256 rc[i].flags = 0; 257 if (rc[i].tries == 0) 258 continue; 259 260 rate = rt->info[rc[i].rix].rateCode; 261 262 /* 263 * Only enable short preamble for legacy rates 264 */ 265 if ((! IS_HT_RATE(rate)) && bf->bf_state.bfs_shpream) 266 rate |= rt->info[rc[i].rix].shortPreamble; 267 268 /* 269 * Save this, used by the TX and completion code 270 */ 271 rc[i].ratecode = rate; 272 273 if (bf->bf_state.bfs_txflags & 274 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 275 rc[i].flags |= ATH_RC_RTSCTS_FLAG; 276 277 /* 278 * If we can't do LDPC, don't. 279 */ 280 if (! IS_HT_RATE(rate)) 281 do_ldpc = 0; 282 283 /* Only enable shortgi, 2040, dual-stream if HT is set */ 284 if (IS_HT_RATE(rate)) { 285 rc[i].flags |= ATH_RC_HT_FLAG; 286 287 if (ni->ni_chw == 40) 288 rc[i].flags |= ATH_RC_CW40_FLAG; 289 290 /* 291 * NOTE: Don't do short-gi for positioning frames. 292 * 293 * For now, the ath_hal and net80211 HT duration 294 * calculation rounds up the 11n data txtime 295 * to the nearest multiple of 3.6 microseconds 296 * and doesn't return the fractional part, so 297 * we are always "out" by some amount. 298 */ 299 if (ni->ni_chw == 40 && 300 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 301 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40 && 302 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI40 && 303 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) { 304 rc[i].flags |= ATH_RC_SGI_FLAG; 305 } 306 307 if (ni->ni_chw == 20 && 308 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 309 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20 && 310 vap->iv_flags_ht & IEEE80211_FHT_SHORTGI20 && 311 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) { 312 rc[i].flags |= ATH_RC_SGI_FLAG; 313 } 314 315 /* 316 * If we have STBC TX enabled and the receiver 317 * can receive (at least) 1 stream STBC, AND it's 318 * MCS 0-7, AND we have at least two chains enabled, 319 * and we're not doing positioning, enable STBC. 320 */ 321 if (ic->ic_htcaps & IEEE80211_HTCAP_TXSTBC && 322 (ni->ni_vap->iv_flags_ht & IEEE80211_FHT_STBC_TX) && 323 (ni->ni_htcap & IEEE80211_HTCAP_RXSTBC) && 324 (sc->sc_cur_txchainmask > 1) && 325 (HT_RC_2_STREAMS(rate) == 1) && 326 (bf->bf_flags & ATH_BUF_TOA_PROBE) == 0) { 327 rc[i].flags |= ATH_RC_STBC_FLAG; 328 do_stbc = 1; 329 } 330 331 /* 332 * Dual / Triple stream rate? 333 */ 334 if (HT_RC_2_STREAMS(rate) == 2) 335 rc[i].flags |= ATH_RC_DS_FLAG; 336 else if (HT_RC_2_STREAMS(rate) == 3) 337 rc[i].flags |= ATH_RC_TS_FLAG; 338 } 339 340 /* 341 * Calculate the maximum TX power cap for the current 342 * node. 343 */ 344 rc[i].tx_power_cap = ieee80211_get_node_txpower(ni); 345 346 /* 347 * Calculate the maximum 4ms frame length based 348 * on the MCS rate, SGI and channel width flags. 349 */ 350 if ((rc[i].flags & ATH_RC_HT_FLAG) && 351 (HT_RC_2_MCS(rate) < 32)) { 352 int j; 353 if (rc[i].flags & ATH_RC_CW40_FLAG) { 354 if (rc[i].flags & ATH_RC_SGI_FLAG) 355 j = MCS_HT40_SGI; 356 else 357 j = MCS_HT40; 358 } else { 359 if (rc[i].flags & ATH_RC_SGI_FLAG) 360 j = MCS_HT20_SGI; 361 else 362 j = MCS_HT20; 363 } 364 rc[i].max4msframelen = 365 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)]; 366 } else 367 rc[i].max4msframelen = 0; 368 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 369 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n", 370 __func__, i, rate, rc[i].flags, rc[i].max4msframelen); 371 } 372 373 /* 374 * LDPC is a global flag, so ... 375 */ 376 if (do_ldpc) { 377 bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC; 378 sc->sc_stats.ast_tx_ldpc++; 379 } 380 381 if (do_stbc) { 382 sc->sc_stats.ast_tx_stbc++; 383 } 384} 385 386/* 387 * Return the number of delimiters to be added to 388 * meet the minimum required mpdudensity. 389 * 390 * Caller should make sure that the rate is HT. 391 * 392 * TODO: is this delimiter calculation supposed to be the 393 * total frame length, the hdr length, the data length (including 394 * delimiters, padding, CRC, etc) or ? 395 * 396 * TODO: this should ensure that the rate control information 397 * HAS been setup for the first rate. 398 * 399 * TODO: ensure this is only called for MCS rates. 400 * 401 * TODO: enforce MCS < 31 402 */ 403static int 404ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 405 uint16_t pktlen, int is_first) 406{ 407 const HAL_RATE_TABLE *rt = sc->sc_currates; 408 struct ieee80211_node *ni = first_bf->bf_node; 409 struct ieee80211vap *vap = ni->ni_vap; 410 int ndelim, mindelim = 0; 411 int mpdudensity; /* in 1/100'th of a microsecond */ 412 int peer_mpdudensity; /* net80211 value */ 413 uint8_t rc, rix, flags; 414 int width, half_gi; 415 uint32_t nsymbits, nsymbols; 416 uint16_t minlen; 417 418 /* 419 * Get the advertised density from the node. 420 */ 421 peer_mpdudensity = 422 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY); 423 424 /* 425 * vap->iv_ampdu_density is a net80211 value, rather than the actual 426 * density. Larger values are longer A-MPDU density spacing values, 427 * and we want to obey larger configured / negotiated density values 428 * per station if we get it. 429 */ 430 if (vap->iv_ampdu_density > peer_mpdudensity) 431 peer_mpdudensity = vap->iv_ampdu_density; 432 433 /* 434 * Convert the A-MPDU density net80211 value to a 1/100 microsecond 435 * value for subsequent calculations. 436 */ 437 if (peer_mpdudensity > IEEE80211_HTCAP_MPDUDENSITY_16) 438 mpdudensity = 1600; /* maximum density */ 439 else 440 mpdudensity = ieee80211_mpdudensity_map[peer_mpdudensity]; 441 442 /* Select standard number of delimiters based on frame length */ 443 ndelim = ATH_AGGR_GET_NDELIM(pktlen); 444 445 /* 446 * If encryption is enabled, add extra delimiters to let the 447 * crypto hardware catch up. This could be tuned per-MAC and 448 * per-rate, but for now we'll simply assume encryption is 449 * always enabled. 450 * 451 * Also note that the Atheros reference driver inserts two 452 * delimiters by default for pre-AR9380 peers. This will 453 * include "that" required delimiter. 454 */ 455 ndelim += ATH_AGGR_ENCRYPTDELIM; 456 457 /* 458 * For AR9380, there's a minimum number of delimiters 459 * required when doing RTS. 460 * 461 * XXX TODO: this is only needed if (a) RTS/CTS is enabled for 462 * this exchange, and (b) (done) this is the first sub-frame 463 * in the aggregate. 464 */ 465 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR) 466 && ndelim < AH_FIRST_DESC_NDELIMS && is_first) 467 ndelim = AH_FIRST_DESC_NDELIMS; 468 469 /* 470 * If sc_delim_min_pad is non-zero, enforce it as the minimum 471 * pad delimiter count. 472 */ 473 if (sc->sc_delim_min_pad != 0) 474 ndelim = MAX(ndelim, sc->sc_delim_min_pad); 475 476 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 477 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 478 __func__, pktlen, ndelim, mpdudensity); 479 480 /* 481 * If the MPDU density is 0, we can return here. 482 * Otherwise, we need to convert the desired mpdudensity 483 * into a byte length, based on the rate in the subframe. 484 */ 485 if (mpdudensity == 0) 486 return ndelim; 487 488 /* 489 * Convert desired mpdu density from microeconds to bytes based 490 * on highest rate in rate series (i.e. first rate) to determine 491 * required minimum length for subframe. Take into account 492 * whether high rate is 20 or 40Mhz and half or full GI. 493 */ 494 rix = first_bf->bf_state.bfs_rc[0].rix; 495 rc = rt->info[rix].rateCode; 496 flags = first_bf->bf_state.bfs_rc[0].flags; 497 width = !! (flags & ATH_RC_CW40_FLAG); 498 half_gi = !! (flags & ATH_RC_SGI_FLAG); 499 500 /* 501 * mpdudensity is in 1/100th of a usec, so divide by 100 502 */ 503 if (half_gi) 504 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 505 else 506 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 507 nsymbols /= 100; 508 509 if (nsymbols == 0) 510 nsymbols = 1; 511 512 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 513 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 514 515 /* 516 * Min length is the minimum frame length for the 517 * required MPDU density. 518 */ 519 if (pktlen < minlen) { 520 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 521 ndelim = MAX(mindelim, ndelim); 522 } 523 524 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 525 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 526 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 527 528 return ndelim; 529} 530 531/* 532 * XXX TODO: put into net80211 533 */ 534static int 535ath_rx_ampdu_to_byte(char a) 536{ 537 switch (a) { 538 case IEEE80211_HTCAP_MAXRXAMPDU_16K: 539 return 16384; 540 break; 541 case IEEE80211_HTCAP_MAXRXAMPDU_32K: 542 return 32768; 543 break; 544 case IEEE80211_HTCAP_MAXRXAMPDU_64K: 545 return 65536; 546 break; 547 case IEEE80211_HTCAP_MAXRXAMPDU_8K: 548 default: 549 return 8192; 550 break; 551 } 552} 553 554/* 555 * Fetch the aggregation limit. 556 * 557 * It's the lowest of the four rate series 4ms frame length. 558 * 559 * Also take into account the hardware specific limits (8KiB on AR5416) 560 * and per-peer limits in non-STA mode. 561 */ 562static int 563ath_get_aggr_limit(struct ath_softc *sc, struct ieee80211_node *ni, 564 struct ath_buf *bf) 565{ 566 struct ieee80211vap *vap = ni->ni_vap; 567 568 int amin = ATH_AGGR_MAXSIZE; 569 int i; 570 571 /* Extract out the maximum configured driver A-MPDU limit */ 572 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE) 573 amin = sc->sc_aggr_limit; 574 575 /* Check the vap configured transmit limit */ 576 amin = MIN(amin, ath_rx_ampdu_to_byte(vap->iv_ampdu_limit)); 577 578 /* 579 * Check the HTCAP field for the maximum size the node has 580 * negotiated. If it's smaller than what we have, cap it there. 581 */ 582 amin = MIN(amin, ath_rx_ampdu_to_byte( 583 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU))); 584 585 for (i = 0; i < ATH_RC_NUM; i++) { 586 if (bf->bf_state.bfs_rc[i].tries == 0) 587 continue; 588 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 589 } 590 591 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 592 "%s: aggr_limit=%d, iv_ampdu_limit=%d, " 593 "peer maxrxampdu=%d, max frame len=%d\n", 594 __func__, 595 sc->sc_aggr_limit, 596 vap->iv_ampdu_limit, 597 _IEEE80211_MASKSHIFT(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU), 598 amin); 599 600 return amin; 601} 602 603/* 604 * Setup a 11n rate series structure 605 * 606 * This should be called for both legacy and MCS rates. 607 * 608 * This uses the rate series stuf from ath_tx_rate_fill_rcflags(). 609 * 610 * It, along with ath_buf_set_rate, must be called -after- a burst 611 * or aggregate is setup. 612 */ 613static void 614ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 615 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 616{ 617 struct ieee80211com *ic = ni->ni_ic; 618 struct ath_hal *ah = sc->sc_ah; 619 HAL_BOOL shortPreamble = AH_FALSE; 620 const HAL_RATE_TABLE *rt = sc->sc_currates; 621 int i; 622 int pktlen; 623 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 624 625 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 626 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 627 shortPreamble = AH_TRUE; 628 629 /* 630 * If this is the first frame in an aggregate series, 631 * use the aggregate length. 632 */ 633 if (bf->bf_state.bfs_aggr) 634 pktlen = bf->bf_state.bfs_al; 635 else 636 pktlen = bf->bf_state.bfs_pktlen; 637 638 /* 639 * XXX TODO: modify this routine to use the bfs_rc[x].flags 640 * XXX fields. 641 */ 642 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 643 for (i = 0; i < ATH_RC_NUM; i++) { 644 /* Only set flags for actual TX attempts */ 645 if (rc[i].tries == 0) 646 continue; 647 648 series[i].Tries = rc[i].tries; 649 650 /* 651 * XXX TODO: When the NIC is capable of three stream TX, 652 * transmit 1/2 stream rates on two streams. 653 * 654 * This reduces the power consumption of the NIC and 655 * keeps it within the PCIe slot power limits. 656 */ 657 series[i].ChSel = sc->sc_cur_txchainmask; 658 659 /* 660 * Setup rate and TX power cap for this series. 661 */ 662 series[i].Rate = rt->info[rc[i].rix].rateCode; 663 series[i].RateIndex = rc[i].rix; 664 series[i].tx_power_cap = rc[i].tx_power_cap; 665 666 /* 667 * Enable RTS/CTS as appropriate. 668 */ 669 if (rc[i].flags & ATH_RC_RTSCTS_FLAG) 670 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 671 672 /* 673 * 11n rate? Update 11n flags. 674 */ 675 if (rc[i].flags & ATH_RC_HT_FLAG) { 676 if (rc[i].flags & ATH_RC_CW40_FLAG) 677 series[i].RateFlags |= HAL_RATESERIES_2040; 678 679 if (rc[i].flags & ATH_RC_SGI_FLAG) 680 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 681 682 if (rc[i].flags & ATH_RC_STBC_FLAG) 683 series[i].RateFlags |= HAL_RATESERIES_STBC; 684 } 685 686 /* 687 * TODO: If we're all doing 11n rates then we can set LDPC. 688 * If we've been asked to /do/ LDPC but we are handed a 689 * legacy rate, then we should complain. Loudly. 690 */ 691 692 /* 693 * PktDuration doesn't include slot, ACK, RTS, etc timing - 694 * it's just the packet duration 695 */ 696 if (rc[i].flags & ATH_RC_HT_FLAG) { 697 series[i].PktDuration = 698 ath_computedur_ht(pktlen 699 , series[i].Rate 700 , HT_RC_2_STREAMS(series[i].Rate) 701 , series[i].RateFlags & HAL_RATESERIES_2040 702 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 703 } else { 704 if (shortPreamble) 705 series[i].Rate |= 706 rt->info[rc[i].rix].shortPreamble; 707 /* XXX TODO: don't include SIFS */ 708 series[i].PktDuration = ath_hal_computetxtime(ah, 709 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE); 710 } 711 } 712} 713 714#ifdef ATH_DEBUG 715static void 716ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 717{ 718 int i; 719 for (i = 0; i < ATH_RC_NUM; i++) { 720 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 721 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 722 i, 723 series[i].Rate, 724 series[i].Tries, 725 series[i].PktDuration, 726 series[i].ChSel, 727 series[i].tx_power_cap, 728 series[i].RateFlags); 729 } 730} 731#endif 732 733/* 734 * Setup the 11n rate scenario and burst duration for the given TX descriptor 735 * list. 736 * 737 * This isn't useful for sending beacon frames, which has different needs 738 * wrt what's passed into the rate scenario function. 739 */ 740void 741ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 742 struct ath_buf *bf) 743{ 744 HAL_11N_RATE_SERIES series[4]; 745 struct ath_desc *ds = bf->bf_desc; 746 struct ath_hal *ah = sc->sc_ah; 747 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 748 int ctsrate = bf->bf_state.bfs_ctsrate; 749 int flags = bf->bf_state.bfs_txflags; 750 751 /* Setup rate scenario */ 752 memset(&series, 0, sizeof(series)); 753 754 ath_rateseries_setup(sc, ni, bf, series); 755 756#ifdef ATH_DEBUG 757 if (sc->sc_debug & ATH_DEBUG_XMIT) 758 ath_rateseries_print(sc, series); 759#endif 760 761 /* Set rate scenario */ 762 /* 763 * Note: Don't allow hardware to override the duration on 764 * ps-poll packets. 765 */ 766 ath_hal_set11nratescenario(ah, ds, 767 !is_pspoll, /* whether to override the duration or not */ 768 ctsrate, /* rts/cts rate */ 769 series, /* 11n rate series */ 770 4, /* number of series */ 771 flags); 772 773 /* Set burst duration */ 774 /* 775 * This is only required when doing 11n burst, not aggregation 776 * ie, if there's a second frame in a RIFS or A-MPDU burst 777 * w/ >1 A-MPDU frame bursting back to back. 778 * Normal A-MPDU doesn't do bursting -between- aggregates. 779 * 780 * .. and it's highly likely this won't ever be implemented 781 */ 782 //ath_hal_set11nburstduration(ah, ds, 8192); 783} 784 785/* 786 * Form an aggregate packet list. 787 * 788 * This function enforces the aggregate restrictions/requirements. 789 * 790 * These are: 791 * 792 * + The aggregate size maximum (64k for AR9160 and later, 8K for 793 * AR5416 when doing RTS frame protection.) 794 * + Maximum number of sub-frames for an aggregate 795 * + The aggregate delimiter size, giving MACs time to do whatever is 796 * needed before each frame 797 * + Enforce the BAW limit 798 * 799 * Each descriptor queued should have the DMA setup. 800 * The rate series, descriptor setup, linking, etc is all done 801 * externally. This routine simply chains them together. 802 * ath_tx_setds_11n() will take care of configuring the per- 803 * descriptor setup, and ath_buf_set_rate() will configure the 804 * rate control. 805 * 806 * The TID lock is required for the entirety of this function. 807 * 808 * If some code in another thread adds to the head of this 809 * list, very strange behaviour will occur. Since retransmission is the 810 * only reason this will occur, and this routine is designed to be called 811 * from within the scheduler task, it won't ever clash with the completion 812 * task. 813 * 814 * So if you want to call this from an upper layer context (eg, to direct- 815 * dispatch aggregate frames to the hardware), please keep this in mind. 816 */ 817ATH_AGGR_STATUS 818ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 819 struct ath_tid *tid, ath_bufhead *bf_q) 820{ 821 //struct ieee80211_node *ni = &an->an_node; 822 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 823 int nframes = 0; 824 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 825 struct ieee80211_tx_ampdu *tap; 826 int status = ATH_AGGR_DONE; 827 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 828 int prev_al = 0; /* XXX also for AR5416 burst */ 829 830 ATH_TX_LOCK_ASSERT(sc); 831 832 tap = ath_tx_get_tx_tid(an, tid->tid); 833 if (tap == NULL) { 834 status = ATH_AGGR_ERROR; 835 goto finish; 836 } 837 838 /* 839 * Limit the maximum number of frames in this A-MPDU 840 * to half of the window size. This is done to prevent 841 * sending a LOT of frames that may fail in one batch 842 * when operating in higher MCS rates. If there are more 843 * frames available to send then up to two A-MPDUs will 844 * be queued per hardware queue, so we'll "just" get 845 * a second A-MPDU. 846 */ 847 h_baw = tap->txa_wnd / 2; 848 849 for (;;) { 850 bf = ATH_TID_FIRST(tid); 851 if (bf == NULL) { 852 status = ATH_AGGR_DONE; 853 break; 854 } 855 if (bf_first == NULL) { 856 bf_first = bf; 857 /* 858 * It's the first frame; 859 * set the aggregation limit based on the 860 * rate control decision that has been made. 861 */ 862 aggr_limit = ath_get_aggr_limit(sc, &an->an_node, 863 bf_first); 864 if (bf_first->bf_state.bfs_rc_maxpktlen > 0) { 865 aggr_limit = MIN(aggr_limit, 866 bf_first->bf_state.bfs_rc_maxpktlen); 867 } 868 } 869 870 /* Set this early just so things don't get confused */ 871 bf->bf_next = NULL; 872 873 /* 874 * If the frame doesn't have a sequence number that we're 875 * tracking in the BAW (eg NULL QOS data frame), we can't 876 * aggregate it. Stop the aggregation process; the sender 877 * can then TX what's in the list thus far and then 878 * TX the frame individually. 879 */ 880 if (! bf->bf_state.bfs_dobaw) { 881 status = ATH_AGGR_NONAGGR; 882 break; 883 } 884 885 /* 886 * If any of the rates are non-HT, this packet 887 * can't be aggregated. 888 * XXX TODO: add a bf_state flag which gets marked 889 * if any active rate is non-HT. 890 */ 891 892 /* 893 * do not exceed aggregation limit 894 */ 895 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 896 if (nframes && 897 (aggr_limit < (al + bpad + al_delta + prev_al))) { 898 status = ATH_AGGR_LIMITED; 899 break; 900 } 901 902 /* 903 * If RTS/CTS is set on the first frame, enforce 904 * the RTS aggregate limit. 905 */ 906 if (bf_first->bf_state.bfs_txflags & 907 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 908 if (nframes && 909 (sc->sc_rts_aggr_limit < 910 (al + bpad + al_delta + prev_al))) { 911 status = ATH_AGGR_8K_LIMITED; 912 break; 913 } 914 } 915 916 /* 917 * Do not exceed subframe limit. 918 */ 919 if ((nframes + prev_frames) >= MIN((h_baw), 920 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 921 status = ATH_AGGR_LIMITED; 922 break; 923 } 924 925 /* 926 * If the current frame has an RTS/CTS configuration 927 * that differs from the first frame, override the 928 * subsequent frame with this config. 929 */ 930 if (bf != bf_first) { 931 bf->bf_state.bfs_txflags &= 932 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 933 bf->bf_state.bfs_txflags |= 934 bf_first->bf_state.bfs_txflags & 935 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 936 } 937 938 /* 939 * If the packet has a sequence number, do not 940 * step outside of the block-ack window. 941 */ 942 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 943 SEQNO(bf->bf_state.bfs_seqno))) { 944 status = ATH_AGGR_BAW_CLOSED; 945 break; 946 } 947 948 /* 949 * this packet is part of an aggregate. 950 */ 951 ATH_TID_REMOVE(tid, bf, bf_list); 952 953 /* The TID lock is required for the BAW update */ 954 ath_tx_addto_baw(sc, an, tid, bf); 955 bf->bf_state.bfs_addedbaw = 1; 956 957 /* 958 * XXX enforce ACK for aggregate frames (this needs to be 959 * XXX handled more gracefully? 960 */ 961 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 962 device_printf(sc->sc_dev, 963 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 964 __func__); 965 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 966 } 967 968 /* 969 * Add the now owned buffer (which isn't 970 * on the software TXQ any longer) to our 971 * aggregate frame list. 972 */ 973 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 974 nframes ++; 975 976 /* Completion handler */ 977 bf->bf_comp = ath_tx_aggr_comp; 978 979 /* 980 * add padding for previous frame to aggregation length 981 */ 982 al += bpad + al_delta; 983 984 /* 985 * Calculate delimiters needed for the current frame 986 */ 987 bf->bf_state.bfs_ndelim = 988 ath_compute_num_delims(sc, bf_first, 989 bf->bf_state.bfs_pktlen, (bf_first == bf)); 990 991 /* 992 * Calculate the padding needed from this set of delimiters, 993 * used when calculating if the next frame will fit in 994 * the aggregate. 995 */ 996 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 997 998 /* 999 * Chain the buffers together 1000 */ 1001 if (bf_prev) 1002 bf_prev->bf_next = bf; 1003 bf_prev = bf; 1004 1005 /* 1006 * If we're leaking frames, just return at this point; 1007 * we've queued a single frame and we don't want to add 1008 * any more. 1009 */ 1010 if (tid->an->an_leak_count) { 1011 status = ATH_AGGR_LEAK_CLOSED; 1012 break; 1013 } 1014 1015#if 0 1016 /* 1017 * terminate aggregation on a small packet boundary 1018 */ 1019 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 1020 status = ATH_AGGR_SHORTPKT; 1021 break; 1022 } 1023#endif 1024 } 1025 1026finish: 1027 /* 1028 * Just in case the list was empty when we tried to 1029 * dequeue a packet .. 1030 */ 1031 if (bf_first) { 1032 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 1033 "%s: al=%d bytes; requested %d bytes\n", 1034 __func__, al, bf_first->bf_state.bfs_rc_maxpktlen); 1035 1036 bf_first->bf_state.bfs_al = al; 1037 bf_first->bf_state.bfs_nframes = nframes; 1038 } 1039 return status; 1040} 1041