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 ieee80211com *ic = ni->ni_ic; 226 const HAL_RATE_TABLE *rt = sc->sc_currates; 227 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 228 uint8_t rate; 229 int i; 230 231 for (i = 0; i < ATH_RC_NUM; i++) { 232 rc[i].flags = 0; 233 if (rc[i].tries == 0) 234 continue; 235 236 rate = rt->info[rc[i].rix].rateCode; 237 238 /* 239 * XXX only do this for legacy rates? 240 */ 241 if (bf->bf_state.bfs_shpream) 242 rate |= rt->info[rc[i].rix].shortPreamble; 243 244 /* 245 * Save this, used by the TX and completion code 246 */ 247 rc[i].ratecode = rate; 248 249 if (bf->bf_state.bfs_txflags & 250 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 251 rc[i].flags |= ATH_RC_RTSCTS_FLAG; 252 253 /* Only enable shortgi, 2040, dual-stream if HT is set */ 254 if (IS_HT_RATE(rate)) { 255 rc[i].flags |= ATH_RC_HT_FLAG; 256 257 if (ni->ni_chw == 40) 258 rc[i].flags |= ATH_RC_CW40_FLAG; 259 260 if (ni->ni_chw == 40 && 261 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 262 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 263 rc[i].flags |= ATH_RC_SGI_FLAG; 264 265 if (ni->ni_chw == 20 && 266 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 267 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 268 rc[i].flags |= ATH_RC_SGI_FLAG; 269 270 /* XXX dual stream? and 3-stream? */ 271 } 272 273 /* 274 * Calculate the maximum 4ms frame length based 275 * on the MCS rate, SGI and channel width flags. 276 */ 277 if ((rc[i].flags & ATH_RC_HT_FLAG) && 278 (HT_RC_2_MCS(rate) < 32)) { 279 int j; 280 if (rc[i].flags & ATH_RC_CW40_FLAG) { 281 if (rc[i].flags & ATH_RC_SGI_FLAG) 282 j = MCS_HT40_SGI; 283 else 284 j = MCS_HT40; 285 } else { 286 if (rc[i].flags & ATH_RC_SGI_FLAG) 287 j = MCS_HT20_SGI; 288 else 289 j = MCS_HT20; 290 } 291 rc[i].max4msframelen = 292 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)]; 293 } else 294 rc[i].max4msframelen = 0; 295 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 296 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n", 297 __func__, i, rate, rc[i].flags, rc[i].max4msframelen); 298 } 299 } 300 301 /* 302 * Return the number of delimiters to be added to 303 * meet the minimum required mpdudensity. 304 * 305 * Caller should make sure that the rate is HT. 306 * 307 * TODO: is this delimiter calculation supposed to be the 308 * total frame length, the hdr length, the data length (including 309 * delimiters, padding, CRC, etc) or ? 310 * 311 * TODO: this should ensure that the rate control information 312 * HAS been setup for the first rate. 313 * 314 * TODO: ensure this is only called for MCS rates. 315 * 316 * TODO: enforce MCS < 31 317 */ 318 static int 319 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 320 uint16_t pktlen) 321 { 322 const HAL_RATE_TABLE *rt = sc->sc_currates; 323 struct ieee80211_node *ni = first_bf->bf_node; 324 struct ieee80211vap *vap = ni->ni_vap; 325 int ndelim, mindelim = 0; 326 int mpdudensity; /* in 1/100'th of a microsecond */ 327 uint8_t rc, rix, flags; 328 int width, half_gi; 329 uint32_t nsymbits, nsymbols; 330 uint16_t minlen; 331 332 /* 333 * vap->iv_ampdu_density is a value, rather than the actual 334 * density. 335 */ 336 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16) 337 mpdudensity = 1600; /* maximum density */ 338 else 339 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density]; 340 341 /* Select standard number of delimiters based on frame length */ 342 ndelim = ATH_AGGR_GET_NDELIM(pktlen); 343 344 /* 345 * If encryption is enabled, add extra delimiters to let the 346 * crypto hardware catch up. This could be tuned per-MAC and 347 * per-rate, but for now we'll simply assume encryption is 348 * always enabled. 349 */ 350 ndelim += ATH_AGGR_ENCRYPTDELIM; 351 352 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 353 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 354 __func__, pktlen, ndelim, mpdudensity); 355 356 /* 357 * If the MPDU density is 0, we can return here. 358 * Otherwise, we need to convert the desired mpdudensity 359 * into a byte length, based on the rate in the subframe. 360 */ 361 if (mpdudensity == 0) 362 return ndelim; 363 364 /* 365 * Convert desired mpdu density from microeconds to bytes based 366 * on highest rate in rate series (i.e. first rate) to determine 367 * required minimum length for subframe. Take into account 368 * whether high rate is 20 or 40Mhz and half or full GI. 369 */ 370 rix = first_bf->bf_state.bfs_rc[0].rix; 371 rc = rt->info[rix].rateCode; 372 flags = first_bf->bf_state.bfs_rc[0].flags; 373 width = !! (flags & ATH_RC_CW40_FLAG); 374 half_gi = !! (flags & ATH_RC_SGI_FLAG); 375 376 /* 377 * mpdudensity is in 1/100th of a usec, so divide by 100 378 */ 379 if (half_gi) 380 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 381 else 382 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 383 nsymbols /= 100; 384 385 if (nsymbols == 0) 386 nsymbols = 1; 387 388 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 389 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 390 391 /* 392 * Min length is the minimum frame length for the 393 * required MPDU density. 394 */ 395 if (pktlen < minlen) { 396 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 397 ndelim = MAX(mindelim, ndelim); 398 } 399 400 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 401 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 402 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 403 404 return ndelim; 405 } 406 407 /* 408 * Fetch the aggregation limit. 409 * 410 * It's the lowest of the four rate series 4ms frame length. 411 */ 412 static int 413 ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 414 { 415 int amin = 65530; 416 int i; 417 418 for (i = 0; i < ATH_RC_NUM; i++) { 419 if (bf->bf_state.bfs_rc[i].tries == 0) 420 continue; 421 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 422 } 423 424 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 425 __func__, amin); 426 427 return amin; 428 } 429 430 /* 431 * Setup a 11n rate series structure 432 * 433 * This should be called for both legacy and MCS rates. 434 * 435 * It, along with ath_buf_set_rate, must be called -after- a burst 436 * or aggregate is setup. 437 */ 438 static void 439 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 440 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 441 { 442 struct ieee80211com *ic = ni->ni_ic; 443 struct ath_hal *ah = sc->sc_ah; 444 HAL_BOOL shortPreamble = AH_FALSE; 445 const HAL_RATE_TABLE *rt = sc->sc_currates; 446 int i; 447 int pktlen; 448 int flags = bf->bf_state.bfs_txflags; 449 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 450 451 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 452 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) 453 shortPreamble = AH_TRUE; 454 455 /* 456 * If this is the first frame in an aggregate series, 457 * use the aggregate length. 458 */ 459 if (bf->bf_state.bfs_aggr) 460 pktlen = bf->bf_state.bfs_al; 461 else 462 pktlen = bf->bf_state.bfs_pktlen; 463 464 /* 465 * XXX TODO: modify this routine to use the bfs_rc[x].flags 466 * XXX fields. 467 */ 468 memset(series, 0, sizeof(HAL_11N_RATE_SERIES) * 4); 469 for (i = 0; i < ATH_RC_NUM; i++) { 470 /* Only set flags for actual TX attempts */ 471 if (rc[i].tries == 0) 472 continue; 473 474 series[i].Tries = rc[i].tries; 475 476 /* 477 * XXX this isn't strictly correct - sc_txchainmask 478 * XXX isn't the currently active chainmask; 479 * XXX it's the interface chainmask at startup. 480 * XXX It's overridden in the HAL rate scenario function 481 * XXX for now. 482 */ 483 series[i].ChSel = sc->sc_txchainmask; 484 485 if (flags & (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 486 series[i].RateFlags |= HAL_RATESERIES_RTS_CTS; 487 488 /* 489 * Transmit 40MHz frames only if the node has negotiated 490 * it rather than whether the node is capable of it or not. 491 * It's subtly different in the hostap case. 492 */ 493 if (ni->ni_chw == 40) 494 series[i].RateFlags |= HAL_RATESERIES_2040; 495 496 /* 497 * Set short-GI only if the node has advertised it 498 * the channel width is suitable, and we support it. 499 * We don't currently have a "negotiated" set of bits - 500 * ni_htcap is what the remote end sends, not what this 501 * node is capable of. 502 */ 503 if (ni->ni_chw == 40 && 504 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 505 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 506 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 507 508 if (ni->ni_chw == 20 && 509 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 510 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 511 series[i].RateFlags |= HAL_RATESERIES_HALFGI; 512 513 series[i].Rate = rt->info[rc[i].rix].rateCode; 514 series[i].RateIndex = rc[i].rix; 515 series[i].tx_power_cap = 0x3f; /* XXX for now */ 516 517 /* 518 * PktDuration doesn't include slot, ACK, RTS, etc timing - 519 * it's just the packet duration 520 */ 521 if (series[i].Rate & IEEE80211_RATE_MCS) { 522 series[i].PktDuration = 523 ath_computedur_ht(pktlen 524 , series[i].Rate 525 , HT_RC_2_STREAMS(series[i].Rate) 526 , series[i].RateFlags & HAL_RATESERIES_2040 527 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 528 } else { 529 if (shortPreamble) 530 series[i].Rate |= 531 rt->info[rc[i].rix].shortPreamble; 532 series[i].PktDuration = ath_hal_computetxtime(ah, 533 rt, pktlen, rc[i].rix, shortPreamble); 534 } 535 } 536 } 537 538 #if 0 539 static void 540 ath_rateseries_print(struct ath_softc *sc, HAL_11N_RATE_SERIES *series) 541 { 542 int i; 543 for (i = 0; i < ATH_RC_NUM; i++) { 544 device_printf(sc->sc_dev ,"series %d: rate %x; tries %d; " 545 "pktDuration %d; chSel %d; rateFlags %x\n", 546 i, 547 series[i].Rate, 548 series[i].Tries, 549 series[i].PktDuration, 550 series[i].ChSel, 551 series[i].RateFlags); 552 } 553 } 554 #endif 555 556 /* 557 * Setup the 11n rate scenario and burst duration for the given TX descriptor 558 * list. 559 * 560 * This isn't useful for sending beacon frames, which has different needs 561 * wrt what's passed into the rate scenario function. 562 */ 563 void 564 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 565 struct ath_buf *bf) 566 { 567 HAL_11N_RATE_SERIES series[4]; 568 struct ath_desc *ds = bf->bf_desc; 569 struct ath_hal *ah = sc->sc_ah; 570 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 571 int ctsrate = bf->bf_state.bfs_ctsrate; 572 int flags = bf->bf_state.bfs_txflags; 573 574 /* Setup rate scenario */ 575 memset(&series, 0, sizeof(series)); 576 577 ath_rateseries_setup(sc, ni, bf, series); 578 579 #if 0 580 printf("pktlen: %d; flags 0x%x\n", pktlen, flags); 581 ath_rateseries_print(sc, series); 582 #endif 583 584 /* Set rate scenario */ 585 /* 586 * Note: Don't allow hardware to override the duration on 587 * ps-poll packets. 588 */ 589 ath_hal_set11nratescenario(ah, ds, 590 !is_pspoll, /* whether to override the duration or not */ 591 ctsrate, /* rts/cts rate */ 592 series, /* 11n rate series */ 593 4, /* number of series */ 594 flags); 595 596 /* Set burst duration */ 597 /* 598 * This is only required when doing 11n burst, not aggregation 599 * ie, if there's a second frame in a RIFS or A-MPDU burst 600 * w/ >1 A-MPDU frame bursting back to back. 601 * Normal A-MPDU doesn't do bursting -between- aggregates. 602 * 603 * .. and it's highly likely this won't ever be implemented 604 */ 605 //ath_hal_set11nburstduration(ah, ds, 8192); 606 } 607 608 /* 609 * Form an aggregate packet list. 610 * 611 * This function enforces the aggregate restrictions/requirements. 612 * 613 * These are: 614 * 615 * + The aggregate size maximum (64k for AR9160 and later, 8K for 616 * AR5416 when doing RTS frame protection.) 617 * + Maximum number of sub-frames for an aggregate 618 * + The aggregate delimiter size, giving MACs time to do whatever is 619 * needed before each frame 620 * + Enforce the BAW limit 621 * 622 * Each descriptor queued should have the DMA setup. 623 * The rate series, descriptor setup, linking, etc is all done 624 * externally. This routine simply chains them together. 625 * ath_tx_setds_11n() will take care of configuring the per- 626 * descriptor setup, and ath_buf_set_rate() will configure the 627 * rate control. 628 * 629 * The TID lock is required for the entirety of this function. 630 * 631 * If some code in another thread adds to the head of this 632 * list, very strange behaviour will occur. Since retransmission is the 633 * only reason this will occur, and this routine is designed to be called 634 * from within the scheduler task, it won't ever clash with the completion 635 * task. 636 * 637 * So if you want to call this from an upper layer context (eg, to direct- 638 * dispatch aggregate frames to the hardware), please keep this in mind. 639 */ 640 ATH_AGGR_STATUS 641 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, 642 struct ath_tid *tid, ath_bufhead *bf_q) 643 { 644 //struct ieee80211_node *ni = &an->an_node; 645 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 646 int nframes = 0; 647 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 648 struct ieee80211_tx_ampdu *tap; 649 int status = ATH_AGGR_DONE; 650 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 651 int prev_al = 0; /* XXX also for AR5416 burst */ 652 653 ATH_TXQ_LOCK_ASSERT(sc->sc_ac2q[tid->ac]); 654 655 tap = ath_tx_get_tx_tid(an, tid->tid); 656 if (tap == NULL) { 657 status = ATH_AGGR_ERROR; 658 goto finish; 659 } 660 661 h_baw = tap->txa_wnd / 2; 662 663 for (;;) { 664 bf = ATH_TID_FIRST(tid); 665 if (bf_first == NULL) 666 bf_first = bf; 667 if (bf == NULL) { 668 status = ATH_AGGR_DONE; 669 break; 670 } else { 671 /* 672 * It's the first frame; 673 * set the aggregation limit based on the 674 * rate control decision that has been made. 675 */ 676 aggr_limit = ath_get_aggr_limit(sc, bf_first); 677 } 678 679 /* Set this early just so things don't get confused */ 680 bf->bf_next = NULL; 681 682 /* 683 * Don't unlock the tid lock until we're sure we are going 684 * to queue this frame. 685 */ 686 687 /* 688 * If the frame doesn't have a sequence number that we're 689 * tracking in the BAW (eg NULL QOS data frame), we can't 690 * aggregate it. Stop the aggregation process; the sender 691 * can then TX what's in the list thus far and then 692 * TX the frame individually. 693 */ 694 if (! bf->bf_state.bfs_dobaw) { 695 status = ATH_AGGR_NONAGGR; 696 break; 697 } 698 699 /* 700 * If any of the rates are non-HT, this packet 701 * can't be aggregated. 702 * XXX TODO: add a bf_state flag which gets marked 703 * if any active rate is non-HT. 704 */ 705 706 /* 707 * do not exceed aggregation limit 708 */ 709 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 710 if (nframes && 711 (aggr_limit < (al + bpad + al_delta + prev_al))) { 712 status = ATH_AGGR_LIMITED; 713 break; 714 } 715 716 /* 717 * If RTS/CTS is set on the first frame, enforce 718 * the RTS aggregate limit. 719 */ 720 if (bf_first->bf_state.bfs_txflags & 721 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 722 if (nframes && 723 (sc->sc_rts_aggr_limit < 724 (al + bpad + al_delta + prev_al))) { 725 status = ATH_AGGR_8K_LIMITED; 726 break; 727 } 728 } 729 730 /* 731 * Do not exceed subframe limit. 732 */ 733 if ((nframes + prev_frames) >= MIN((h_baw), 734 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 735 status = ATH_AGGR_LIMITED; 736 break; 737 } 738 739 /* 740 * If the current frame has an RTS/CTS configuration 741 * that differs from the first frame, override the 742 * subsequent frame with this config. 743 */ 744 bf->bf_state.bfs_txflags &= 745 ~ (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 746 bf->bf_state.bfs_txflags |= 747 bf_first->bf_state.bfs_txflags & 748 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 749 750 /* 751 * If the packet has a sequence number, do not 752 * step outside of the block-ack window. 753 */ 754 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 755 SEQNO(bf->bf_state.bfs_seqno))) { 756 status = ATH_AGGR_BAW_CLOSED; 757 break; 758 } 759 760 /* 761 * this packet is part of an aggregate. 762 */ 763 ATH_TID_REMOVE(tid, bf, bf_list); 764 765 /* The TID lock is required for the BAW update */ 766 ath_tx_addto_baw(sc, an, tid, bf); 767 bf->bf_state.bfs_addedbaw = 1; 768 769 /* 770 * XXX enforce ACK for aggregate frames (this needs to be 771 * XXX handled more gracefully? 772 */ 773 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 774 device_printf(sc->sc_dev, 775 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 776 __func__); 777 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 778 } 779 780 /* 781 * Add the now owned buffer (which isn't 782 * on the software TXQ any longer) to our 783 * aggregate frame list. 784 */ 785 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 786 nframes ++; 787 788 /* Completion handler */ 789 bf->bf_comp = ath_tx_aggr_comp; 790 791 /* 792 * add padding for previous frame to aggregation length 793 */ 794 al += bpad + al_delta; 795 796 /* 797 * Calculate delimiters needed for the current frame 798 */ 799 bf->bf_state.bfs_ndelim = 800 ath_compute_num_delims(sc, bf_first, 801 bf->bf_state.bfs_pktlen); 802 803 /* 804 * Calculate the padding needed from this set of delimiters, 805 * used when calculating if the next frame will fit in 806 * the aggregate. 807 */ 808 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 809 810 /* 811 * Chain the buffers together 812 */ 813 if (bf_prev) 814 bf_prev->bf_next = bf; 815 bf_prev = bf; 816 817 /* 818 * XXX TODO: if any sub-frames have RTS/CTS enabled; 819 * enable it for the entire aggregate. 820 */ 821 822 #if 0 823 /* 824 * terminate aggregation on a small packet boundary 825 */ 826 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 827 status = ATH_AGGR_SHORTPKT; 828 break; 829 } 830 #endif 831 832 } 833 834 finish: 835 /* 836 * Just in case the list was empty when we tried to 837 * dequeue a packet .. 838 */ 839 if (bf_first) { 840 bf_first->bf_state.bfs_al = al; 841 bf_first->bf_state.bfs_nframes = nframes; 842 } 843 return status; 844 } 845