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 * XXX TODO: put into net80211 533 */ 534 static int 535 ath_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 */ 562 static int 563 ath_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 #define MS(_v, _f) (((_v) & _f) >> _f##_S) 569 int amin = ATH_AGGR_MAXSIZE; 570 int i; 571 572 /* Extract out the maximum configured driver A-MPDU limit */ 573 if (sc->sc_aggr_limit > 0 && sc->sc_aggr_limit < ATH_AGGR_MAXSIZE) 574 amin = sc->sc_aggr_limit; 575 576 /* Check the vap configured transmit limit */ 577 amin = MIN(amin, ath_rx_ampdu_to_byte(vap->iv_ampdu_limit)); 578 579 /* 580 * Check the HTCAP field for the maximum size the node has 581 * negotiated. If it's smaller than what we have, cap it there. 582 */ 583 amin = MIN(amin, ath_rx_ampdu_to_byte(MS(ni->ni_htparam, 584 IEEE80211_HTCAP_MAXRXAMPDU))); 585 586 for (i = 0; i < ATH_RC_NUM; i++) { 587 if (bf->bf_state.bfs_rc[i].tries == 0) 588 continue; 589 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 590 } 591 592 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 593 __func__, amin); 594 595 return amin; 596 #undef MS 597 } 598 599 /* 600 * Setup a 11n rate series structure 601 * 602 * This should be called for both legacy and MCS rates. 603 * 604 * This uses the rate series stuf from ath_tx_rate_fill_rcflags(). 605 * 606 * It, along with ath_buf_set_rate, must be called -after- a burst 607 * or aggregate is setup. 608 */ 609 static void 610 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 611 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 612 { 613 struct ieee80211com *ic = ni->ni_ic; 614 struct ath_hal *ah = sc->sc_ah; 615 HAL_BOOL shortPreamble = AH_FALSE; 616 const HAL_RATE_TABLE *rt = sc->sc_currates; 617 int i; 618 int pktlen; 619 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 620 621 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 622 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 623 shortPreamble = AH_TRUE; 624 625 /* 626 * If this is the first frame in an aggregate series, 627 * use the aggregate length. 628 */ 629 if (bf->bf_state.bfs_aggr) 630 pktlen = bf->bf_state.bfs_al; 631 else 632 pktlen = bf->bf_state.bfs_pktlen; 633 634 /* 635 * XXX TODO: modify this routine to use the bfs_rc[x].flags 636 * XXX fields. 637 */ 638 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 639 for (i = 0; i < ATH_RC_NUM; i++) { 640 /* Only set flags for actual TX attempts */ 641 if (rc[i].tries == 0) 642 continue; 643 644 series[i].Tries = rc[i].tries; 645 646 /* 647 * XXX TODO: When the NIC is capable of three stream TX, 648 * transmit 1/2 stream rates on two streams. 649 * 650 * This reduces the power consumption of the NIC and 651 * keeps it within the PCIe slot power limits. 652 */ 653 series[i].ChSel = sc->sc_cur_txchainmask; 654 655 /* 656 * Setup rate and TX power cap for this series. 657 */ 658 series[i].Rate = rt->info[rc[i].rix].rateCode; 659 series[i].RateIndex = rc[i].rix; 660 series[i].tx_power_cap = rc[i].tx_power_cap; 661 662 /* 663 * Enable RTS/CTS as appropriate. 664 */ 665 if (rc[i].flags & ATH_RC_RTSCTS_FLAG) 666 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 667 668 /* 669 * 11n rate? Update 11n flags. 670 */ 671 if (rc[i].flags & ATH_RC_HT_FLAG) { 672 if (rc[i].flags & ATH_RC_CW40_FLAG) 673 series[i].RateFlags |= HAL_RATESERIES_2040; 674 675 if (rc[i].flags & ATH_RC_SGI_FLAG) 676 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 677 678 if (rc[i].flags & ATH_RC_STBC_FLAG) 679 series[i].RateFlags |= HAL_RATESERIES_STBC; 680 } 681 682 /* 683 * TODO: If we're all doing 11n rates then we can set LDPC. 684 * If we've been asked to /do/ LDPC but we are handed a 685 * legacy rate, then we should complain. Loudly. 686 */ 687 688 /* 689 * PktDuration doesn't include slot, ACK, RTS, etc timing - 690 * it's just the packet duration 691 */ 692 if (rc[i].flags & ATH_RC_HT_FLAG) { 693 series[i].PktDuration = 694 ath_computedur_ht(pktlen 695 , series[i].Rate 696 , HT_RC_2_STREAMS(series[i].Rate) 697 , series[i].RateFlags & HAL_RATESERIES_2040 698 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 699 } else { 700 if (shortPreamble) 701 series[i].Rate |= 702 rt->info[rc[i].rix].shortPreamble; 703 /* XXX TODO: don't include SIFS */ 704 series[i].PktDuration = ath_hal_computetxtime(ah, 705 rt, pktlen, rc[i].rix, shortPreamble, AH_TRUE); 706 } 707 } 708 } 709 710 #ifdef ATH_DEBUG 711 static void 712 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 713 { 714 int i; 715 for (i = 0; i < ATH_RC_NUM; i++) { 716 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 717 "pktDuration %d; chSel %d; txpowcap %d, rateFlags %x\n", 718 i, 719 series[i].Rate, 720 series[i].Tries, 721 series[i].PktDuration, 722 series[i].ChSel, 723 series[i].tx_power_cap, 724 series[i].RateFlags); 725 } 726 } 727 #endif 728 729 /* 730 * Setup the 11n rate scenario and burst duration for the given TX descriptor 731 * list. 732 * 733 * This isn't useful for sending beacon frames, which has different needs 734 * wrt what's passed into the rate scenario function. 735 */ 736 void 737 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 738 struct ath_buf *bf) 739 { 740 HAL_11N_RATE_SERIES series[4]; 741 struct ath_desc *ds = bf->bf_desc; 742 struct ath_hal *ah = sc->sc_ah; 743 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 744 int ctsrate = bf->bf_state.bfs_ctsrate; 745 int flags = bf->bf_state.bfs_txflags; 746 747 /* Setup rate scenario */ 748 memset(&series, 0, sizeof(series)); 749 750 ath_rateseries_setup(sc, ni, bf, series); 751 752 #ifdef ATH_DEBUG 753 if (sc->sc_debug & ATH_DEBUG_XMIT) 754 ath_rateseries_print(sc, series); 755 #endif 756 757 /* Set rate scenario */ 758 /* 759 * Note: Don't allow hardware to override the duration on 760 * ps-poll packets. 761 */ 762 ath_hal_set11nratescenario(ah, ds, 763 !is_pspoll, /* whether to override the duration or not */ 764 ctsrate, /* rts/cts rate */ 765 series, /* 11n rate series */ 766 4, /* number of series */ 767 flags); 768 769 /* Set burst duration */ 770 /* 771 * This is only required when doing 11n burst, not aggregation 772 * ie, if there's a second frame in a RIFS or A-MPDU burst 773 * w/ >1 A-MPDU frame bursting back to back. 774 * Normal A-MPDU doesn't do bursting -between- aggregates. 775 * 776 * .. and it's highly likely this won't ever be implemented 777 */ 778 //ath_hal_set11nburstduration(ah, ds, 8192); 779 } 780 781 /* 782 * Form an aggregate packet list. 783 * 784 * This function enforces the aggregate restrictions/requirements. 785 * 786 * These are: 787 * 788 * + The aggregate size maximum (64k for AR9160 and later, 8K for 789 * AR5416 when doing RTS frame protection.) 790 * + Maximum number of sub-frames for an aggregate 791 * + The aggregate delimiter size, giving MACs time to do whatever is 792 * needed before each frame 793 * + Enforce the BAW limit 794 * 795 * Each descriptor queued should have the DMA setup. 796 * The rate series, descriptor setup, linking, etc is all done 797 * externally. This routine simply chains them together. 798 * ath_tx_setds_11n() will take care of configuring the per- 799 * descriptor setup, and ath_buf_set_rate() will configure the 800 * rate control. 801 * 802 * The TID lock is required for the entirety of this function. 803 * 804 * If some code in another thread adds to the head of this 805 * list, very strange behaviour will occur. Since retransmission is the 806 * only reason this will occur, and this routine is designed to be called 807 * from within the scheduler task, it won't ever clash with the completion 808 * task. 809 * 810 * So if you want to call this from an upper layer context (eg, to direct- 811 * dispatch aggregate frames to the hardware), please keep this in mind. 812 */ 813 ATH_AGGR_STATUS 814 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 815 struct ath_tid *tid, ath_bufhead *bf_q) 816 { 817 //struct ieee80211_node *ni = &an->an_node; 818 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 819 int nframes = 0; 820 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 821 struct ieee80211_tx_ampdu *tap; 822 int status = ATH_AGGR_DONE; 823 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 824 int prev_al = 0; /* XXX also for AR5416 burst */ 825 826 ATH_TX_LOCK_ASSERT(sc); 827 828 tap = ath_tx_get_tx_tid(an, tid->tid); 829 if (tap == NULL) { 830 status = ATH_AGGR_ERROR; 831 goto finish; 832 } 833 834 h_baw = tap->txa_wnd / 2; 835 836 for (;;) { 837 bf = ATH_TID_FIRST(tid); 838 if (bf_first == NULL) 839 bf_first = bf; 840 if (bf == NULL) { 841 status = ATH_AGGR_DONE; 842 break; 843 } else { 844 /* 845 * It's the first frame; 846 * set the aggregation limit based on the 847 * rate control decision that has been made. 848 */ 849 aggr_limit = ath_get_aggr_limit(sc, &an->an_node, 850 bf_first); 851 } 852 853 /* Set this early just so things don't get confused */ 854 bf->bf_next = NULL; 855 856 /* 857 * If the frame doesn't have a sequence number that we're 858 * tracking in the BAW (eg NULL QOS data frame), we can't 859 * aggregate it. Stop the aggregation process; the sender 860 * can then TX what's in the list thus far and then 861 * TX the frame individually. 862 */ 863 if (! bf->bf_state.bfs_dobaw) { 864 status = ATH_AGGR_NONAGGR; 865 break; 866 } 867 868 /* 869 * If any of the rates are non-HT, this packet 870 * can't be aggregated. 871 * XXX TODO: add a bf_state flag which gets marked 872 * if any active rate is non-HT. 873 */ 874 875 /* 876 * do not exceed aggregation limit 877 */ 878 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 879 if (nframes && 880 (aggr_limit < (al + bpad + al_delta + prev_al))) { 881 status = ATH_AGGR_LIMITED; 882 break; 883 } 884 885 /* 886 * If RTS/CTS is set on the first frame, enforce 887 * the RTS aggregate limit. 888 */ 889 if (bf_first->bf_state.bfs_txflags & 890 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 891 if (nframes && 892 (sc->sc_rts_aggr_limit < 893 (al + bpad + al_delta + prev_al))) { 894 status = ATH_AGGR_8K_LIMITED; 895 break; 896 } 897 } 898 899 /* 900 * Do not exceed subframe limit. 901 */ 902 if ((nframes + prev_frames) >= MIN((h_baw), 903 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 904 status = ATH_AGGR_LIMITED; 905 break; 906 } 907 908 /* 909 * If the current frame has an RTS/CTS configuration 910 * that differs from the first frame, override the 911 * subsequent frame with this config. 912 */ 913 if (bf != bf_first) { 914 bf->bf_state.bfs_txflags &= 915 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 916 bf->bf_state.bfs_txflags |= 917 bf_first->bf_state.bfs_txflags & 918 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 919 } 920 921 /* 922 * If the packet has a sequence number, do not 923 * step outside of the block-ack window. 924 */ 925 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 926 SEQNO(bf->bf_state.bfs_seqno))) { 927 status = ATH_AGGR_BAW_CLOSED; 928 break; 929 } 930 931 /* 932 * this packet is part of an aggregate. 933 */ 934 ATH_TID_REMOVE(tid, bf, bf_list); 935 936 /* The TID lock is required for the BAW update */ 937 ath_tx_addto_baw(sc, an, tid, bf); 938 bf->bf_state.bfs_addedbaw = 1; 939 940 /* 941 * XXX enforce ACK for aggregate frames (this needs to be 942 * XXX handled more gracefully? 943 */ 944 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 945 device_printf(sc->sc_dev, 946 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 947 __func__); 948 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 949 } 950 951 /* 952 * Add the now owned buffer (which isn't 953 * on the software TXQ any longer) to our 954 * aggregate frame list. 955 */ 956 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 957 nframes ++; 958 959 /* Completion handler */ 960 bf->bf_comp = ath_tx_aggr_comp; 961 962 /* 963 * add padding for previous frame to aggregation length 964 */ 965 al += bpad + al_delta; 966 967 /* 968 * Calculate delimiters needed for the current frame 969 */ 970 bf->bf_state.bfs_ndelim = 971 ath_compute_num_delims(sc, bf_first, 972 bf->bf_state.bfs_pktlen); 973 974 /* 975 * Calculate the padding needed from this set of delimiters, 976 * used when calculating if the next frame will fit in 977 * the aggregate. 978 */ 979 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 980 981 /* 982 * Chain the buffers together 983 */ 984 if (bf_prev) 985 bf_prev->bf_next = bf; 986 bf_prev = bf; 987 988 /* 989 * If we're leaking frames, just return at this point; 990 * we've queued a single frame and we don't want to add 991 * any more. 992 */ 993 if (tid->an->an_leak_count) { 994 status = ATH_AGGR_LEAK_CLOSED; 995 break; 996 } 997 998 #if 0 999 /* 1000 * terminate aggregation on a small packet boundary 1001 */ 1002 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 1003 status = ATH_AGGR_SHORTPKT; 1004 break; 1005 } 1006 #endif 1007 1008 } 1009 1010 finish: 1011 /* 1012 * Just in case the list was empty when we tried to 1013 * dequeue a packet .. 1014 */ 1015 if (bf_first) { 1016 bf_first->bf_state.bfs_al = al; 1017 bf_first->bf_state.bfs_nframes = nframes; 1018 } 1019 return status; 1020 } 1021