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("$FreeBSD$"); 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) 112 113 int 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 */ 143 static 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) 172 173 const 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 */ 221 void 222 ath_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; 245 246 /* 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 */ 403 static int 404 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 405 uint16_t pktlen) 406 { 407 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 408 const HAL_RATE_TABLE *rt = sc->sc_currates; 409 struct ieee80211_node *ni = first_bf->bf_node; 410 struct ieee80211vap *vap = ni->ni_vap; 411 int ndelim, mindelim = 0; 412 int mpdudensity; /* in 1/100'th of a microsecond */ 413 int peer_mpdudensity; /* net80211 value */ 414 uint8_t rc, rix, flags; 415 int width, half_gi; 416 uint32_t nsymbits, nsymbols; 417 uint16_t minlen; 418 419 /* 420 * Get the advertised density from the node. 421 */ 422 peer_mpdudensity = MS(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 delimeters 459 * required when doing RTS. 460 * 461 * XXX TODO: this is only needed if (a) RTS/CTS is enabled, and 462 * XXX (b) this is the first sub-frame in the aggregate. 463 */ 464 if (sc->sc_use_ent && (sc->sc_ent_cfg & AH_ENT_RTSCTS_DELIM_WAR) 465 && ndelim < AH_FIRST_DESC_NDELIMS) 466 ndelim = AH_FIRST_DESC_NDELIMS; 467 468 /* 469 * If sc_delim_min_pad is non-zero, enforce it as the minimum 470 * pad delimiter count. 471 */ 472 if (sc->sc_delim_min_pad != 0) 473 ndelim = MAX(ndelim, sc->sc_delim_min_pad); 474 475 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 476 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 477 __func__, pktlen, ndelim, mpdudensity); 478 479 /* 480 * If the MPDU density is 0, we can return here. 481 * Otherwise, we need to convert the desired mpdudensity 482 * into a byte length, based on the rate in the subframe. 483 */ 484 if (mpdudensity == 0) 485 return ndelim; 486 487 /* 488 * Convert desired mpdu density from microeconds to bytes based 489 * on highest rate in rate series (i.e. first rate) to determine 490 * required minimum length for subframe. Take into account 491 * whether high rate is 20 or 40Mhz and half or full GI. 492 */ 493 rix = first_bf->bf_state.bfs_rc[0].rix; 494 rc = rt->info[rix].rateCode; 495 flags = first_bf->bf_state.bfs_rc[0].flags; 496 width = !! (flags & ATH_RC_CW40_FLAG); 497 half_gi = !! (flags & ATH_RC_SGI_FLAG); 498 499 /* 500 * mpdudensity is in 1/100th of a usec, so divide by 100 501 */ 502 if (half_gi) 503 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 504 else 505 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 506 nsymbols /= 100; 507 508 if (nsymbols == 0) 509 nsymbols = 1; 510 511 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 512 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 513 514 /* 515 * Min length is the minimum frame length for the 516 * required MPDU density. 517 */ 518 if (pktlen < minlen) { 519 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 520 ndelim = MAX(mindelim, ndelim); 521 } 522 523 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 524 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 525 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 526 527 return ndelim; 528 #undef MS 529 } 530 531 /* 532 * Fetch the aggregation limit. 533 * 534 * It's the lowest of the four rate series 4ms frame length. 535 * 536 * Also take into account the hardware specific limits (8KiB on AR5416) 537 * and per-peer limits in non-STA mode. 538 */ 539 static int 540 ath_get_aggr_limit(struct ath_softc *sc, struct ieee80211_node *ni, 541 struct ath_buf *bf) 542 { 543 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 544 int amin = ATH_AGGR_MAXSIZE; 545 int i; 546 547 /* Extract out the maximum configured driver A-MPDU limit */ 548 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE) 549 amin = sc->sc_aggr_limit; 550 551 /* 552 * Check the HTCAP field for the maximum size the node has 553 * negotiated. If it's smaller than what we have, cap it there. 554 */ 555 switch (MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU)) { 556 case IEEE80211_HTCAP_MAXRXAMPDU_16K: 557 amin = MIN(amin, 16384); 558 break; 559 case IEEE80211_HTCAP_MAXRXAMPDU_32K: 560 amin = MIN(amin, 32768); 561 break; 562 case IEEE80211_HTCAP_MAXRXAMPDU_64K: 563 amin = MIN(amin, 65536); 564 break; 565 case IEEE80211_HTCAP_MAXRXAMPDU_8K: 566 default: 567 amin = MIN(amin, 8192); 568 break; 569 } 570 571 for (i = 0; i < ATH_RC_NUM; i++) { 572 if (bf->bf_state.bfs_rc[i].tries == 0) 573 continue; 574 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 575 } 576 577 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 578 __func__, amin); 579 580 return amin; 581 #undef MS 582 } 583 584 /* 585 * Setup a 11n rate series structure 586 * 587 * This should be called for both legacy and MCS rates. 588 * 589 * This uses the rate series stuf from ath_tx_rate_fill_rcflags(). 590 * 591 * It, along with ath_buf_set_rate, must be called -after- a burst 592 * or aggregate is setup. 593 */ 594 static void 595 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 596 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 597 { 598 struct ieee80211com *ic = ni->ni_ic; 599 struct ath_hal *ah = sc->sc_ah; 600 HAL_BOOL shortPreamble = AH_FALSE; 601 const HAL_RATE_TABLE *rt = sc->sc_currates; 602 int i; 603 int pktlen; 604 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 605 606 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 607 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 608 shortPreamble = AH_TRUE; 609 610 /* 611 * If this is the first frame in an aggregate series, 612 * use the aggregate length. 613 */ 614 if (bf->bf_state.bfs_aggr) 615 pktlen = bf->bf_state.bfs_al; 616 else 617 pktlen = bf->bf_state.bfs_pktlen; 618 619 /* 620 * XXX TODO: modify this routine to use the bfs_rc[x].flags 621 * XXX fields. 622 */ 623 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 624 for (i = 0; i < ATH_RC_NUM; i++) { 625 /* Only set flags for actual TX attempts */ 626 if (rc[i].tries == 0) 627 continue; 628 629 series[i].Tries = rc[i].tries; 630 631 /* 632 * XXX TODO: When the NIC is capable of three stream TX, 633 * transmit 1/2 stream rates on two streams. 634 * 635 * This reduces the power consumption of the NIC and 636 * keeps it within the PCIe slot power limits. 637 */ 638 series[i].ChSel = sc->sc_cur_txchainmask; 639 640 /* 641 * Setup rate and TX power cap for this series. 642 */ 643 series[i].Rate = rt->info[rc[i].rix].rateCode; 644 series[i].RateIndex = rc[i].rix; 645 series[i].tx_power_cap = rc[i].tx_power_cap; 646 647 /* 648 * Enable RTS/CTS as appropriate. 649 */ 650 if (rc[i].flags & ATH_RC_RTSCTS_FLAG) 651 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 652 653 /* 654 * 11n rate? Update 11n flags. 655 */ 656 if (rc[i].flags & ATH_RC_HT_FLAG) { 657 if (rc[i].flags & ATH_RC_CW40_FLAG) 658 series[i].RateFlags |= HAL_RATESERIES_2040; 659 660 if (rc[i].flags & ATH_RC_SGI_FLAG) 661 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 662 663 if (rc[i].flags & ATH_RC_STBC_FLAG) 664 series[i].RateFlags |= HAL_RATESERIES_STBC; 665 } 666 667 /* 668 * TODO: If we're all doing 11n rates then we can set LDPC. 669 * If we've been asked to /do/ LDPC but we are handed a 670 * legacy rate, then we should complain. Loudly. 671 */ 672 673 /* 674 * PktDuration doesn't include slot, ACK, RTS, etc timing - 675 * it's just the packet duration 676 */ 677 if (rc[i].flags & ATH_RC_HT_FLAG) { 678 series[i].PktDuration = 679 ath_computedur_ht(pktlen 680 , series[i].Rate 681 , HT_RC_2_STREAMS(series[i].Rate) 682 , series[i].RateFlags & HAL_RATESERIES_2040 683 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 684 } else { 685 if (shortPreamble) 686 series[i].Rate |= 687 rt->info[rc[i].rix].shortPreamble; 688 /* XXX TODO: don't include SIFS */ 689 series[i].PktDuration = ath_hal_computetxtime(ah, 690 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE); 691 } 692 } 693 } 694 695 #ifdef ATH_DEBUG 696 static void 697 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 698 { 699 int i; 700 for (i = 0; i < ATH_RC_NUM; i++) { 701 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 702 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 703 i, 704 series[i].Rate, 705 series[i].Tries, 706 series[i].PktDuration, 707 series[i].ChSel, 708 series[i].tx_power_cap, 709 series[i].RateFlags); 710 } 711 } 712 #endif 713 714 /* 715 * Setup the 11n rate scenario and burst duration for the given TX descriptor 716 * list. 717 * 718 * This isn't useful for sending beacon frames, which has different needs 719 * wrt what's passed into the rate scenario function. 720 */ 721 void 722 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 723 struct ath_buf *bf) 724 { 725 HAL_11N_RATE_SERIES series[4]; 726 struct ath_desc *ds = bf->bf_desc; 727 struct ath_hal *ah = sc->sc_ah; 728 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 729 int ctsrate = bf->bf_state.bfs_ctsrate; 730 int flags = bf->bf_state.bfs_txflags; 731 732 /* Setup rate scenario */ 733 memset(&series, 0, sizeof(series)); 734 735 ath_rateseries_setup(sc, ni, bf, series); 736 737 #ifdef ATH_DEBUG 738 if (sc->sc_debug & ATH_DEBUG_XMIT) 739 ath_rateseries_print(sc, series); 740 #endif 741 742 /* Set rate scenario */ 743 /* 744 * Note: Don't allow hardware to override the duration on 745 * ps-poll packets. 746 */ 747 ath_hal_set11nratescenario(ah, ds, 748 !is_pspoll, /* whether to override the duration or not */ 749 ctsrate, /* rts/cts rate */ 750 series, /* 11n rate series */ 751 4, /* number of series */ 752 flags); 753 754 /* Set burst duration */ 755 /* 756 * This is only required when doing 11n burst, not aggregation 757 * ie, if there's a second frame in a RIFS or A-MPDU burst 758 * w/ >1 A-MPDU frame bursting back to back. 759 * Normal A-MPDU doesn't do bursting -between- aggregates. 760 * 761 * .. and it's highly likely this won't ever be implemented 762 */ 763 //ath_hal_set11nburstduration(ah, ds, 8192); 764 } 765 766 /* 767 * Form an aggregate packet list. 768 * 769 * This function enforces the aggregate restrictions/requirements. 770 * 771 * These are: 772 * 773 * + The aggregate size maximum (64k for AR9160 and later, 8K for 774 * AR5416 when doing RTS frame protection.) 775 * + Maximum number of sub-frames for an aggregate 776 * + The aggregate delimiter size, giving MACs time to do whatever is 777 * needed before each frame 778 * + Enforce the BAW limit 779 * 780 * Each descriptor queued should have the DMA setup. 781 * The rate series, descriptor setup, linking, etc is all done 782 * externally. This routine simply chains them together. 783 * ath_tx_setds_11n() will take care of configuring the per- 784 * descriptor setup, and ath_buf_set_rate() will configure the 785 * rate control. 786 * 787 * The TID lock is required for the entirety of this function. 788 * 789 * If some code in another thread adds to the head of this 790 * list, very strange behaviour will occur. Since retransmission is the 791 * only reason this will occur, and this routine is designed to be called 792 * from within the scheduler task, it won't ever clash with the completion 793 * task. 794 * 795 * So if you want to call this from an upper layer context (eg, to direct- 796 * dispatch aggregate frames to the hardware), please keep this in mind. 797 */ 798 ATH_AGGR_STATUS 799 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 800 struct ath_tid *tid, ath_bufhead *bf_q) 801 { 802 //struct ieee80211_node *ni = &an->an_node; 803 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 804 int nframes = 0; 805 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 806 struct ieee80211_tx_ampdu *tap; 807 int status = ATH_AGGR_DONE; 808 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 809 int prev_al = 0; /* XXX also for AR5416 burst */ 810 811 ATH_TX_LOCK_ASSERT(sc); 812 813 tap = ath_tx_get_tx_tid(an, tid->tid); 814 if (tap == NULL) { 815 status = ATH_AGGR_ERROR; 816 goto finish; 817 } 818 819 h_baw = tap->txa_wnd / 2; 820 821 for (;;) { 822 bf = ATH_TID_FIRST(tid); 823 if (bf_first == NULL) 824 bf_first = bf; 825 if (bf == NULL) { 826 status = ATH_AGGR_DONE; 827 break; 828 } else { 829 /* 830 * It's the first frame; 831 * set the aggregation limit based on the 832 * rate control decision that has been made. 833 */ 834 aggr_limit = ath_get_aggr_limit(sc, &an->an_node, 835 bf_first); 836 } 837 838 /* Set this early just so things don't get confused */ 839 bf->bf_next = NULL; 840 841 /* 842 * If the frame doesn't have a sequence number that we're 843 * tracking in the BAW (eg NULL QOS data frame), we can't 844 * aggregate it. Stop the aggregation process; the sender 845 * can then TX what's in the list thus far and then 846 * TX the frame individually. 847 */ 848 if (! bf->bf_state.bfs_dobaw) { 849 status = ATH_AGGR_NONAGGR; 850 break; 851 } 852 853 /* 854 * If any of the rates are non-HT, this packet 855 * can't be aggregated. 856 * XXX TODO: add a bf_state flag which gets marked 857 * if any active rate is non-HT. 858 */ 859 860 /* 861 * do not exceed aggregation limit 862 */ 863 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 864 if (nframes && 865 (aggr_limit < (al + bpad + al_delta + prev_al))) { 866 status = ATH_AGGR_LIMITED; 867 break; 868 } 869 870 /* 871 * If RTS/CTS is set on the first frame, enforce 872 * the RTS aggregate limit. 873 */ 874 if (bf_first->bf_state.bfs_txflags & 875 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 876 if (nframes && 877 (sc->sc_rts_aggr_limit < 878 (al + bpad + al_delta + prev_al))) { 879 status = ATH_AGGR_8K_LIMITED; 880 break; 881 } 882 } 883 884 /* 885 * Do not exceed subframe limit. 886 */ 887 if ((nframes + prev_frames) >= MIN((h_baw), 888 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 889 status = ATH_AGGR_LIMITED; 890 break; 891 } 892 893 /* 894 * If the current frame has an RTS/CTS configuration 895 * that differs from the first frame, override the 896 * subsequent frame with this config. 897 */ 898 if (bf != bf_first) { 899 bf->bf_state.bfs_txflags &= 900 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 901 bf->bf_state.bfs_txflags |= 902 bf_first->bf_state.bfs_txflags & 903 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 904 } 905 906 /* 907 * If the packet has a sequence number, do not 908 * step outside of the block-ack window. 909 */ 910 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 911 SEQNO(bf->bf_state.bfs_seqno))) { 912 status = ATH_AGGR_BAW_CLOSED; 913 break; 914 } 915 916 /* 917 * this packet is part of an aggregate. 918 */ 919 ATH_TID_REMOVE(tid, bf, bf_list); 920 921 /* The TID lock is required for the BAW update */ 922 ath_tx_addto_baw(sc, an, tid, bf); 923 bf->bf_state.bfs_addedbaw = 1; 924 925 /* 926 * XXX enforce ACK for aggregate frames (this needs to be 927 * XXX handled more gracefully? 928 */ 929 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 930 device_printf(sc->sc_dev, 931 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 932 __func__); 933 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 934 } 935 936 /* 937 * Add the now owned buffer (which isn't 938 * on the software TXQ any longer) to our 939 * aggregate frame list. 940 */ 941 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 942 nframes ++; 943 944 /* Completion handler */ 945 bf->bf_comp = ath_tx_aggr_comp; 946 947 /* 948 * add padding for previous frame to aggregation length 949 */ 950 al += bpad + al_delta; 951 952 /* 953 * Calculate delimiters needed for the current frame 954 */ 955 bf->bf_state.bfs_ndelim = 956 ath_compute_num_delims(sc, bf_first, 957 bf->bf_state.bfs_pktlen); 958 959 /* 960 * Calculate the padding needed from this set of delimiters, 961 * used when calculating if the next frame will fit in 962 * the aggregate. 963 */ 964 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 965 966 /* 967 * Chain the buffers together 968 */ 969 if (bf_prev) 970 bf_prev->bf_next = bf; 971 bf_prev = bf; 972 973 /* 974 * If we're leaking frames, just return at this point; 975 * we've queued a single frame and we don't want to add 976 * any more. 977 */ 978 if (tid->an->an_leak_count) { 979 status = ATH_AGGR_LEAK_CLOSED; 980 break; 981 } 982 983 #if 0 984 /* 985 * terminate aggregation on a small packet boundary 986 */ 987 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 988 status = ATH_AGGR_SHORTPKT; 989 break; 990 } 991 #endif 992 993 } 994 995 finish: 996 /* 997 * Just in case the list was empty when we tried to 998 * dequeue a packet .. 999 */ 1000 if (bf_first) { 1001 bf_first->bf_state.bfs_al = al; 1002 bf_first->bf_state.bfs_nframes = nframes; 1003 } 1004 return status; 1005 } 1006