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 #define ATH_AGGR_ENCRYPTDELIM 10 /* number of delimiters for encryption padding */ 102 103 /* 104 * returns delimiter padding required given the packet length 105 */ 106 #define ATH_AGGR_GET_NDELIM(_len) \ 107 (((((_len) + ATH_AGGR_DELIM_SZ) < ATH_AGGR_MINPLEN) ? \ 108 (ATH_AGGR_MINPLEN - (_len) - ATH_AGGR_DELIM_SZ) : 0) >> 2) 109 110 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4) 111 112 int ath_max_4ms_framelen[4][32] = { 113 [MCS_HT20] = { 114 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172, 115 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280, 116 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532, 117 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532, 118 }, 119 [MCS_HT20_SGI] = { 120 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744, 121 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532, 122 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532, 123 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532, 124 }, 125 [MCS_HT40] = { 126 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532, 127 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532, 128 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532, 129 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532, 130 }, 131 [MCS_HT40_SGI] = { 132 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532, 133 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532, 134 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532, 135 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532, 136 } 137 }; 138 139 /* 140 * XXX should be in net80211 141 */ 142 static int ieee80211_mpdudensity_map[] = { 143 0, /* IEEE80211_HTCAP_MPDUDENSITY_NA */ 144 25, /* IEEE80211_HTCAP_MPDUDENSITY_025 */ 145 50, /* IEEE80211_HTCAP_MPDUDENSITY_05 */ 146 100, /* IEEE80211_HTCAP_MPDUDENSITY_1 */ 147 200, /* IEEE80211_HTCAP_MPDUDENSITY_2 */ 148 400, /* IEEE80211_HTCAP_MPDUDENSITY_4 */ 149 800, /* IEEE80211_HTCAP_MPDUDENSITY_8 */ 150 1600, /* IEEE80211_HTCAP_MPDUDENSITY_16 */ 151 }; 152 153 /* 154 * XXX should be in the HAL/net80211 ? 155 */ 156 #define BITS_PER_BYTE 8 157 #define OFDM_PLCP_BITS 22 158 #define HT_RC_2_MCS(_rc) ((_rc) & 0x7f) 159 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1) 160 #define L_STF 8 161 #define L_LTF 8 162 #define L_SIG 4 163 #define HT_SIG 8 164 #define HT_STF 4 165 #define HT_LTF(_ns) (4 * (_ns)) 166 #define SYMBOL_TIME(_ns) ((_ns) << 2) // ns * 4 us 167 #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) // ns * 3.6 us 168 #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2) 169 #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18) 170 #define IS_HT_RATE(_rate) ((_rate) & 0x80) 171 172 const uint32_t bits_per_symbol[][2] = { 173 /* 20MHz 40MHz */ 174 { 26, 54 }, // 0: BPSK 175 { 52, 108 }, // 1: QPSK 1/2 176 { 78, 162 }, // 2: QPSK 3/4 177 { 104, 216 }, // 3: 16-QAM 1/2 178 { 156, 324 }, // 4: 16-QAM 3/4 179 { 208, 432 }, // 5: 64-QAM 2/3 180 { 234, 486 }, // 6: 64-QAM 3/4 181 { 260, 540 }, // 7: 64-QAM 5/6 182 { 52, 108 }, // 8: BPSK 183 { 104, 216 }, // 9: QPSK 1/2 184 { 156, 324 }, // 10: QPSK 3/4 185 { 208, 432 }, // 11: 16-QAM 1/2 186 { 312, 648 }, // 12: 16-QAM 3/4 187 { 416, 864 }, // 13: 64-QAM 2/3 188 { 468, 972 }, // 14: 64-QAM 3/4 189 { 520, 1080 }, // 15: 64-QAM 5/6 190 { 78, 162 }, // 16: BPSK 191 { 156, 324 }, // 17: QPSK 1/2 192 { 234, 486 }, // 18: QPSK 3/4 193 { 312, 648 }, // 19: 16-QAM 1/2 194 { 468, 972 }, // 20: 16-QAM 3/4 195 { 624, 1296 }, // 21: 64-QAM 2/3 196 { 702, 1458 }, // 22: 64-QAM 3/4 197 { 780, 1620 }, // 23: 64-QAM 5/6 198 { 104, 216 }, // 24: BPSK 199 { 208, 432 }, // 25: QPSK 1/2 200 { 312, 648 }, // 26: QPSK 3/4 201 { 416, 864 }, // 27: 16-QAM 1/2 202 { 624, 1296 }, // 28: 16-QAM 3/4 203 { 832, 1728 }, // 29: 64-QAM 2/3 204 { 936, 1944 }, // 30: 64-QAM 3/4 205 { 1040, 2160 }, // 31: 64-QAM 5/6 206 }; 207 208 /* 209 * Fill in the rate array information based on the current 210 * node configuration and the choices made by the rate 211 * selection code and ath_buf setup code. 212 * 213 * Later on, this may end up also being made by the 214 * rate control code, but for now it can live here. 215 * 216 * This needs to be called just before the packet is 217 * queued to the software queue or hardware queue, 218 * so all of the needed fields in bf_state are setup. 219 */ 220 void 221 ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf) 222 { 223 struct ieee80211_node *ni = bf->bf_node; 224 struct ieee80211com *ic = ni->ni_ic; 225 const HAL_RATE_TABLE *rt = sc->sc_currates; 226 struct ath_rc_series *rc = bf->bf_state.bfs_rc; 227 uint8_t rate; 228 int i; 229 230 for (i = 0; i < ATH_RC_NUM; i++) { 231 rc[i].flags = 0; 232 if (rc[i].tries == 0) 233 continue; 234 235 rate = rt->info[rc[i].rix].rateCode; 236 237 /* 238 * XXX only do this for legacy rates? 239 */ 240 if (bf->bf_state.bfs_shpream) 241 rate |= rt->info[rc[i].rix].shortPreamble; 242 243 /* 244 * Save this, used by the TX and completion code 245 */ 246 rc[i].ratecode = rate; 247 248 if (bf->bf_state.bfs_txflags & 249 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) 250 rc[i].flags |= ATH_RC_RTSCTS_FLAG; 251 252 /* Only enable shortgi, 2040, dual-stream if HT is set */ 253 if (IS_HT_RATE(rate)) { 254 rc[i].flags |= ATH_RC_HT_FLAG; 255 256 if (ni->ni_chw == 40) 257 rc[i].flags |= ATH_RC_CW40_FLAG; 258 259 if (ni->ni_chw == 40 && 260 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40 && 261 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI40) 262 rc[i].flags |= ATH_RC_SGI_FLAG; 263 264 if (ni->ni_chw == 20 && 265 ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20 && 266 ni->ni_htcap & IEEE80211_HTCAP_SHORTGI20) 267 rc[i].flags |= ATH_RC_SGI_FLAG; 268 269 /* XXX dual stream? and 3-stream? */ 270 } 271 272 /* 273 * Calculate the maximum 4ms frame length based 274 * on the MCS rate, SGI and channel width flags. 275 */ 276 if ((rc[i].flags & ATH_RC_HT_FLAG) && 277 (HT_RC_2_MCS(rate) < 32)) { 278 int j; 279 if (rc[i].flags & ATH_RC_CW40_FLAG) { 280 if (rc[i].flags & ATH_RC_SGI_FLAG) 281 j = MCS_HT40_SGI; 282 else 283 j = MCS_HT40; 284 } else { 285 if (rc[i].flags & ATH_RC_SGI_FLAG) 286 j = MCS_HT20_SGI; 287 else 288 j = MCS_HT20; 289 } 290 rc[i].max4msframelen = 291 ath_max_4ms_framelen[j][HT_RC_2_MCS(rate)]; 292 } else 293 rc[i].max4msframelen = 0; 294 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 295 "%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n", 296 __func__, i, rate, rc[i].flags, rc[i].max4msframelen); 297 } 298 } 299 300 /* 301 * Return the number of delimiters to be added to 302 * meet the minimum required mpdudensity. 303 * 304 * Caller should make sure that the rate is HT. 305 * 306 * TODO: is this delimiter calculation supposed to be the 307 * total frame length, the hdr length, the data length (including 308 * delimiters, padding, CRC, etc) or ? 309 * 310 * TODO: this should ensure that the rate control information 311 * HAS been setup for the first rate. 312 * 313 * TODO: ensure this is only called for MCS rates. 314 * 315 * TODO: enforce MCS < 31 316 */ 317 static int 318 ath_compute_num_delims(struct ath_softc *sc, struct ath_buf *first_bf, 319 uint16_t pktlen) 320 { 321 const HAL_RATE_TABLE *rt = sc->sc_currates; 322 struct ieee80211_node *ni = first_bf->bf_node; 323 struct ieee80211vap *vap = ni->ni_vap; 324 int ndelim, mindelim = 0; 325 int mpdudensity; /* in 1/100'th of a microsecond */ 326 uint8_t rc, rix, flags; 327 int width, half_gi; 328 uint32_t nsymbits, nsymbols; 329 uint16_t minlen; 330 331 /* 332 * vap->iv_ampdu_density is a value, rather than the actual 333 * density. 334 */ 335 if (vap->iv_ampdu_density > IEEE80211_HTCAP_MPDUDENSITY_16) 336 mpdudensity = 1600; /* maximum density */ 337 else 338 mpdudensity = ieee80211_mpdudensity_map[vap->iv_ampdu_density]; 339 340 /* Select standard number of delimiters based on frame length */ 341 ndelim = ATH_AGGR_GET_NDELIM(pktlen); 342 343 /* 344 * If encryption is enabled, add extra delimiters to let the 345 * crypto hardware catch up. This could be tuned per-MAC and 346 * per-rate, but for now we'll simply assume encryption is 347 * always enabled. 348 */ 349 ndelim += ATH_AGGR_ENCRYPTDELIM; 350 351 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 352 "%s: pktlen=%d, ndelim=%d, mpdudensity=%d\n", 353 __func__, pktlen, ndelim, mpdudensity); 354 355 /* 356 * If the MPDU density is 0, we can return here. 357 * Otherwise, we need to convert the desired mpdudensity 358 * into a byte length, based on the rate in the subframe. 359 */ 360 if (mpdudensity == 0) 361 return ndelim; 362 363 /* 364 * Convert desired mpdu density from microeconds to bytes based 365 * on highest rate in rate series (i.e. first rate) to determine 366 * required minimum length for subframe. Take into account 367 * whether high rate is 20 or 40Mhz and half or full GI. 368 */ 369 rix = first_bf->bf_state.bfs_rc[0].rix; 370 rc = rt->info[rix].rateCode; 371 flags = first_bf->bf_state.bfs_rc[0].flags; 372 width = !! (flags & ATH_RC_CW40_FLAG); 373 half_gi = !! (flags & ATH_RC_SGI_FLAG); 374 375 /* 376 * mpdudensity is in 1/100th of a usec, so divide by 100 377 */ 378 if (half_gi) 379 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity); 380 else 381 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity); 382 nsymbols /= 100; 383 384 if (nsymbols == 0) 385 nsymbols = 1; 386 387 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width]; 388 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE; 389 390 /* 391 * Min length is the minimum frame length for the 392 * required MPDU density. 393 */ 394 if (pktlen < minlen) { 395 mindelim = (minlen - pktlen) / ATH_AGGR_DELIM_SZ; 396 ndelim = MAX(mindelim, ndelim); 397 } 398 399 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, 400 "%s: pktlen=%d, minlen=%d, rix=%x, rc=%x, width=%d, hgi=%d, ndelim=%d\n", 401 __func__, pktlen, minlen, rix, rc, width, half_gi, ndelim); 402 403 return ndelim; 404 } 405 406 /* 407 * Fetch the aggregation limit. 408 * 409 * It's the lowest of the four rate series 4ms frame length. 410 */ 411 static int 412 ath_get_aggr_limit(struct ath_softc *sc, struct ath_buf *bf) 413 { 414 int amin = 65530; 415 int i; 416 417 for (i = 0; i < 4; i++) { 418 if (bf->bf_state.bfs_rc[i].tries == 0) 419 continue; 420 amin = MIN(amin, bf->bf_state.bfs_rc[i].max4msframelen); 421 } 422 423 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: max frame len= %d\n", 424 __func__, amin); 425 426 return amin; 427 } 428 429 /* 430 * Setup a 11n rate series structure 431 * 432 * This should be called for both legacy and MCS rates. 433 * 434 * It, along with ath_buf_set_rate, must be called -after- a burst 435 * or aggregate is setup. 436 */ 437 static void 438 ath_rateseries_setup(struct ath_softc *sc, struct ieee80211_node *ni, 439 struct ath_buf *bf, HAL_11N_RATE_SERIES *series) 440 { 441 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1) 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 < 4; 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; 514 515 /* PktDuration doesn't include slot, ACK, RTS, etc timing - it's just the packet duration */ 516 if (series[i].Rate & IEEE80211_RATE_MCS) { 517 series[i].PktDuration = 518 ath_computedur_ht(pktlen 519 , series[i].Rate 520 , HT_RC_2_STREAMS(series[i].Rate) 521 , series[i].RateFlags & HAL_RATESERIES_2040 522 , series[i].RateFlags & HAL_RATESERIES_HALFGI); 523 } else { 524 if (shortPreamble) 525 series[i].Rate |= 526 rt->info[rc[i].rix].shortPreamble; 527 series[i].PktDuration = ath_hal_computetxtime(ah, 528 rt, pktlen, rc[i].rix, shortPreamble); 529 } 530 } 531 #undef HT_RC_2_STREAMS 532 } 533 534 #if 0 535 static void 536 ath_rateseries_print(HAL_11N_RATE_SERIES *series) 537 { 538 int i; 539 for (i = 0; i < 4; i++) { 540 printf("series %d: rate %x; tries %d; pktDuration %d; chSel %d; rateFlags %x\n", 541 i, 542 series[i].Rate, 543 series[i].Tries, 544 series[i].PktDuration, 545 series[i].ChSel, 546 series[i].RateFlags); 547 } 548 } 549 #endif 550 551 /* 552 * Setup the 11n rate scenario and burst duration for the given TX descriptor 553 * list. 554 * 555 * This isn't useful for sending beacon frames, which has different needs 556 * wrt what's passed into the rate scenario function. 557 */ 558 559 void 560 ath_buf_set_rate(struct ath_softc *sc, struct ieee80211_node *ni, 561 struct ath_buf *bf) 562 { 563 HAL_11N_RATE_SERIES series[4]; 564 struct ath_desc *ds = bf->bf_desc; 565 struct ath_desc *lastds = NULL; 566 struct ath_hal *ah = sc->sc_ah; 567 int is_pspoll = (bf->bf_state.bfs_atype == HAL_PKT_TYPE_PSPOLL); 568 int ctsrate = bf->bf_state.bfs_ctsrate; 569 int flags = bf->bf_state.bfs_txflags; 570 571 /* Setup rate scenario */ 572 memset(&series, 0, sizeof(series)); 573 574 ath_rateseries_setup(sc, ni, bf, series); 575 576 /* Enforce AR5416 aggregate limit - can't do RTS w/ an agg frame > 8k */ 577 578 /* Enforce RTS and CTS are mutually exclusive */ 579 580 /* Get a pointer to the last tx descriptor in the list */ 581 lastds = bf->bf_lastds; 582 583 #if 0 584 printf("pktlen: %d; flags 0x%x\n", pktlen, flags); 585 ath_rateseries_print(series); 586 #endif 587 588 /* Set rate scenario */ 589 ath_hal_set11nratescenario(ah, ds, 590 !is_pspoll, /* whether to override the duration or not */ 591 /* don't allow hardware to override the duration on ps-poll packets */ 592 ctsrate, /* rts/cts rate */ 593 series, /* 11n rate series */ 594 4, /* number of series */ 595 flags); 596 597 /* Setup the last descriptor in the chain */ 598 ath_hal_setuplasttxdesc(ah, lastds, ds); 599 600 /* Set burst duration */ 601 /* 602 * This is only required when doing 11n burst, not aggregation 603 * ie, if there's a second frame in a RIFS or A-MPDU burst 604 * w/ >1 A-MPDU frame bursting back to back. 605 * Normal A-MPDU doesn't do bursting -between- aggregates. 606 * 607 * .. and it's highly likely this won't ever be implemented 608 */ 609 //ath_hal_set11nburstduration(ah, ds, 8192); 610 } 611 612 /* 613 * Form an aggregate packet list. 614 * 615 * This function enforces the aggregate restrictions/requirements. 616 * 617 * These are: 618 * 619 * + The aggregate size maximum (64k for AR9160 and later, 8K for 620 * AR5416 when doing RTS frame protection.) 621 * + Maximum number of sub-frames for an aggregate 622 * + The aggregate delimiter size, giving MACs time to do whatever is 623 * needed before each frame 624 * + Enforce the BAW limit 625 * 626 * Each descriptor queued should have the DMA setup. 627 * The rate series, descriptor setup, linking, etc is all done 628 * externally. This routine simply chains them together. 629 * ath_tx_setds_11n() will take care of configuring the per- 630 * descriptor setup, and ath_buf_set_rate() will configure the 631 * rate control. 632 * 633 * Note that the TID lock is only grabbed when dequeuing packets from 634 * the TID queue. If some code in another thread adds to the head of this 635 * list, very strange behaviour will occur. Since retransmission is the 636 * only reason this will occur, and this routine is designed to be called 637 * from within the scheduler task, it won't ever clash with the completion 638 * task. 639 * 640 * So if you want to call this from an upper layer context (eg, to direct- 641 * dispatch aggregate frames to the hardware), please keep this in mind. 642 */ 643 ATH_AGGR_STATUS 644 ath_tx_form_aggr(struct ath_softc *sc, struct ath_node *an, struct ath_tid *tid, 645 ath_bufhead *bf_q) 646 { 647 struct ieee80211_node *ni = &an->an_node; 648 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL; 649 int nframes = 0; 650 uint16_t aggr_limit = 0, al = 0, bpad = 0, al_delta, h_baw; 651 struct ieee80211_tx_ampdu *tap; 652 int status = ATH_AGGR_DONE; 653 int prev_frames = 0; /* XXX for AR5416 burst, not done here */ 654 int prev_al = 0; /* XXX also for AR5416 burst */ 655 656 ATH_TXQ_LOCK_ASSERT(sc->sc_ac2q[tid->ac]); 657 658 tap = ath_tx_get_tx_tid(an, tid->tid); 659 if (tap == NULL) { 660 status = ATH_AGGR_ERROR; 661 goto finish; 662 } 663 664 h_baw = tap->txa_wnd / 2; 665 666 for (;;) { 667 bf = TAILQ_FIRST(&tid->axq_q); 668 if (bf_first == NULL) 669 bf_first = bf; 670 if (bf == NULL) { 671 status = ATH_AGGR_DONE; 672 break; 673 } else { 674 /* 675 * It's the first frame; 676 * set the aggregation limit based on the 677 * rate control decision that has been made. 678 */ 679 aggr_limit = ath_get_aggr_limit(sc, bf_first); 680 } 681 682 /* Set this early just so things don't get confused */ 683 bf->bf_next = NULL; 684 685 /* 686 * Don't unlock the tid lock until we're sure we are going 687 * to queue this frame. 688 */ 689 690 /* 691 * If the frame doesn't have a sequence number that we're 692 * tracking in the BAW (eg NULL QOS data frame), we can't 693 * aggregate it. Stop the aggregation process; the sender 694 * can then TX what's in the list thus far and then 695 * TX the frame individually. 696 */ 697 if (! bf->bf_state.bfs_dobaw) { 698 status = ATH_AGGR_NONAGGR; 699 break; 700 } 701 702 /* 703 * If any of the rates are non-HT, this packet 704 * can't be aggregated. 705 * XXX TODO: add a bf_state flag which gets marked 706 * if any active rate is non-HT. 707 */ 708 709 /* 710 * do not exceed aggregation limit 711 */ 712 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_state.bfs_pktlen; 713 if (nframes && 714 (aggr_limit < (al + bpad + al_delta + prev_al))) { 715 status = ATH_AGGR_LIMITED; 716 break; 717 } 718 719 /* 720 * If RTS/CTS is set on the first frame, enforce 721 * the RTS aggregate limit. 722 */ 723 if (bf_first->bf_state.bfs_txflags & 724 (HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA)) { 725 if (nframes && 726 (sc->sc_rts_aggr_limit < 727 (al + bpad + al_delta + prev_al))) { 728 status = ATH_AGGR_8K_LIMITED; 729 break; 730 } 731 } 732 733 /* 734 * Do not exceed subframe limit. 735 */ 736 if ((nframes + prev_frames) >= MIN((h_baw), 737 IEEE80211_AMPDU_SUBFRAME_DEFAULT)) { 738 status = ATH_AGGR_LIMITED; 739 break; 740 } 741 742 /* 743 * If the current frame has an RTS/CTS configuration 744 * that differs from the first frame, override the 745 * subsequent frame with this config. 746 */ 747 bf->bf_state.bfs_txflags &= 748 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 749 bf->bf_state.bfs_txflags |= 750 bf_first->bf_state.bfs_txflags & 751 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA); 752 753 /* 754 * TODO: If it's _before_ the BAW left edge, complain very 755 * loudly. 756 * 757 * This means something (else) has slid the left edge along 758 * before we got a chance to be TXed. 759 */ 760 761 /* 762 * Check if we have space in the BAW for this frame before 763 * we add it. 764 * 765 * see ath_tx_xmit_aggr() for more info. 766 */ 767 if (bf->bf_state.bfs_dobaw) { 768 ieee80211_seq seqno; 769 770 /* 771 * If the sequence number is allocated, use it. 772 * Otherwise, use the sequence number we WOULD 773 * allocate. 774 */ 775 if (bf->bf_state.bfs_seqno_assigned) 776 seqno = SEQNO(bf->bf_state.bfs_seqno); 777 else 778 seqno = ni->ni_txseqs[bf->bf_state.bfs_tid]; 779 780 /* 781 * Check whether either the currently allocated 782 * sequence number _OR_ the to-be allocated 783 * sequence number is inside the BAW. 784 */ 785 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 786 seqno)) { 787 status = ATH_AGGR_BAW_CLOSED; 788 break; 789 } 790 791 /* XXX check for bfs_need_seqno? */ 792 if (! bf->bf_state.bfs_seqno_assigned) { 793 int seqno; 794 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, bf->bf_m); 795 if (seqno < 0) { 796 device_printf(sc->sc_dev, 797 "%s: bf=%p, huh, seqno=-1?\n", 798 __func__, 799 bf); 800 /* XXX what can we even do here? */ 801 } 802 /* Flush seqno update to RAM */ 803 /* 804 * XXX This is required because the dmasetup 805 * XXX is done early rather than at dispatch 806 * XXX time. Ew, we should fix this! 807 */ 808 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, 809 BUS_DMASYNC_PREWRITE); 810 } 811 } 812 813 /* 814 * If the packet has a sequence number, do not 815 * step outside of the block-ack window. 816 */ 817 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd, 818 SEQNO(bf->bf_state.bfs_seqno))) { 819 device_printf(sc->sc_dev, 820 "%s: bf=%p, seqno=%d, outside?!\n", 821 __func__, bf, SEQNO(bf->bf_state.bfs_seqno)); 822 status = ATH_AGGR_BAW_CLOSED; 823 break; 824 } 825 826 /* 827 * this packet is part of an aggregate. 828 */ 829 ATH_TXQ_REMOVE(tid, bf, bf_list); 830 831 /* The TID lock is required for the BAW update */ 832 ath_tx_addto_baw(sc, an, tid, bf); 833 bf->bf_state.bfs_addedbaw = 1; 834 835 /* 836 * XXX enforce ACK for aggregate frames (this needs to be 837 * XXX handled more gracefully? 838 */ 839 if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) { 840 device_printf(sc->sc_dev, 841 "%s: HAL_TXDESC_NOACK set for an aggregate frame?\n", 842 __func__); 843 bf->bf_state.bfs_txflags &= (~HAL_TXDESC_NOACK); 844 } 845 846 /* 847 * Add the now owned buffer (which isn't 848 * on the software TXQ any longer) to our 849 * aggregate frame list. 850 */ 851 TAILQ_INSERT_TAIL(bf_q, bf, bf_list); 852 nframes ++; 853 854 /* Completion handler */ 855 bf->bf_comp = ath_tx_aggr_comp; 856 857 /* 858 * add padding for previous frame to aggregation length 859 */ 860 al += bpad + al_delta; 861 862 /* 863 * Calculate delimiters needed for the current frame 864 */ 865 bf->bf_state.bfs_ndelim = 866 ath_compute_num_delims(sc, bf_first, 867 bf->bf_state.bfs_pktlen); 868 869 /* 870 * Calculate the padding needed from this set of delimiters, 871 * used when calculating if the next frame will fit in 872 * the aggregate. 873 */ 874 bpad = PADBYTES(al_delta) + (bf->bf_state.bfs_ndelim << 2); 875 876 /* 877 * Chain the buffers together 878 */ 879 if (bf_prev) 880 bf_prev->bf_next = bf; 881 bf_prev = bf; 882 883 /* 884 * XXX TODO: if any sub-frames have RTS/CTS enabled; 885 * enable it for the entire aggregate. 886 */ 887 888 #if 0 889 /* 890 * terminate aggregation on a small packet boundary 891 */ 892 if (bf->bf_state.bfs_pktlen < ATH_AGGR_MINPLEN) { 893 status = ATH_AGGR_SHORTPKT; 894 break; 895 } 896 #endif 897 898 } 899 900 finish: 901 /* 902 * Just in case the list was empty when we tried to 903 * dequeue a packet .. 904 */ 905 if (bf_first) { 906 bf_first->bf_state.bfs_al = al; 907 bf_first->bf_state.bfs_nframes = nframes; 908 } 909 return status; 910 } 911