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sys/dev/ath/if_ath_tx.c
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1 /*- 2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 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 /* 34 * Driver for the Atheros Wireless LAN controller. 35 * 36 * This software is derived from work of Atsushi Onoe; his contribution 37 * is greatly appreciated. 38 */ 39 40 #include "opt_inet.h" 41 #include "opt_ath.h" 42 #include "opt_wlan.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/sysctl.h> 47 #include <sys/mbuf.h> 48 #include <sys/malloc.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/kernel.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 #include <sys/errno.h> 55 #include <sys/callout.h> 56 #include <sys/bus.h> 57 #include <sys/endian.h> 58 #include <sys/kthread.h> 59 #include <sys/taskqueue.h> 60 #include <sys/priv.h> 61 62 #include <machine/bus.h> 63 64 #include <net/if.h> 65 #include <net/if_dl.h> 66 #include <net/if_media.h> 67 #include <net/if_types.h> 68 #include <net/if_arp.h> 69 #include <net/ethernet.h> 70 #include <net/if_llc.h> 71 72 #include <net80211/ieee80211_var.h> 73 #include <net80211/ieee80211_regdomain.h> 74 #ifdef IEEE80211_SUPPORT_SUPERG 75 #include <net80211/ieee80211_superg.h> 76 #endif 77 #ifdef IEEE80211_SUPPORT_TDMA 78 #include <net80211/ieee80211_tdma.h> 79 #endif 80 81 #include <net/bpf.h> 82 83 #ifdef INET 84 #include <netinet/in.h> 85 #include <netinet/if_ether.h> 86 #endif 87 88 #include <dev/ath/if_athvar.h> 89 #include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */ 90 #include <dev/ath/ath_hal/ah_diagcodes.h> 91 92 #include <dev/ath/if_ath_debug.h> 93 94 #ifdef ATH_TX99_DIAG 95 #include <dev/ath/ath_tx99/ath_tx99.h> 96 #endif 97 98 #include <dev/ath/if_ath_misc.h> 99 #include <dev/ath/if_ath_tx.h> 100 #include <dev/ath/if_ath_tx_ht.h> 101 102 /* 103 * Whether to use the 11n rate scenario functions or not 104 */ 105 static inline int 106 ath_tx_is_11n(struct ath_softc *sc) 107 { 108 return (sc->sc_ah->ah_magic == 0x20065416); 109 } 110 111 void 112 ath_txfrag_cleanup(struct ath_softc *sc, 113 ath_bufhead *frags, struct ieee80211_node *ni) 114 { 115 struct ath_buf *bf, *next; 116 117 ATH_TXBUF_LOCK_ASSERT(sc); 118 119 STAILQ_FOREACH_SAFE(bf, frags, bf_list, next) { 120 /* NB: bf assumed clean */ 121 STAILQ_REMOVE_HEAD(frags, bf_list); 122 STAILQ_INSERT_HEAD(&sc->sc_txbuf, bf, bf_list); 123 ieee80211_node_decref(ni); 124 } 125 } 126 127 /* 128 * Setup xmit of a fragmented frame. Allocate a buffer 129 * for each frag and bump the node reference count to 130 * reflect the held reference to be setup by ath_tx_start. 131 */ 132 int 133 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags, 134 struct mbuf *m0, struct ieee80211_node *ni) 135 { 136 struct mbuf *m; 137 struct ath_buf *bf; 138 139 ATH_TXBUF_LOCK(sc); 140 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) { 141 bf = _ath_getbuf_locked(sc); 142 if (bf == NULL) { /* out of buffers, cleanup */ 143 ath_txfrag_cleanup(sc, frags, ni); 144 break; 145 } 146 ieee80211_node_incref(ni); 147 STAILQ_INSERT_TAIL(frags, bf, bf_list); 148 } 149 ATH_TXBUF_UNLOCK(sc); 150 151 return !STAILQ_EMPTY(frags); 152 } 153 154 /* 155 * Reclaim mbuf resources. For fragmented frames we 156 * need to claim each frag chained with m_nextpkt. 157 */ 158 void 159 ath_freetx(struct mbuf *m) 160 { 161 struct mbuf *next; 162 163 do { 164 next = m->m_nextpkt; 165 m->m_nextpkt = NULL; 166 m_freem(m); 167 } while ((m = next) != NULL); 168 } 169 170 static int 171 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0) 172 { 173 struct mbuf *m; 174 int error; 175 176 /* 177 * Load the DMA map so any coalescing is done. This 178 * also calculates the number of descriptors we need. 179 */ 180 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0, 181 bf->bf_segs, &bf->bf_nseg, 182 BUS_DMA_NOWAIT); 183 if (error == EFBIG) { 184 /* XXX packet requires too many descriptors */ 185 bf->bf_nseg = ATH_TXDESC+1; 186 } else if (error != 0) { 187 sc->sc_stats.ast_tx_busdma++; 188 ath_freetx(m0); 189 return error; 190 } 191 /* 192 * Discard null packets and check for packets that 193 * require too many TX descriptors. We try to convert 194 * the latter to a cluster. 195 */ 196 if (bf->bf_nseg > ATH_TXDESC) { /* too many desc's, linearize */ 197 sc->sc_stats.ast_tx_linear++; 198 m = m_collapse(m0, M_NOWAIT, ATH_TXDESC); 199 if (m == NULL) { 200 ath_freetx(m0); 201 sc->sc_stats.ast_tx_nombuf++; 202 return ENOMEM; 203 } 204 m0 = m; 205 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0, 206 bf->bf_segs, &bf->bf_nseg, 207 BUS_DMA_NOWAIT); 208 if (error != 0) { 209 sc->sc_stats.ast_tx_busdma++; 210 ath_freetx(m0); 211 return error; 212 } 213 KASSERT(bf->bf_nseg <= ATH_TXDESC, 214 ("too many segments after defrag; nseg %u", bf->bf_nseg)); 215 } else if (bf->bf_nseg == 0) { /* null packet, discard */ 216 sc->sc_stats.ast_tx_nodata++; 217 ath_freetx(m0); 218 return EIO; 219 } 220 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n", 221 __func__, m0, m0->m_pkthdr.len); 222 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE); 223 bf->bf_m = m0; 224 225 return 0; 226 } 227 228 static void 229 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_txq *txq, struct ath_buf *bf) 230 { 231 struct ath_hal *ah = sc->sc_ah; 232 struct ath_desc *ds, *ds0; 233 int i; 234 235 /* 236 * Fillin the remainder of the descriptor info. 237 */ 238 ds0 = ds = bf->bf_desc; 239 for (i = 0; i < bf->bf_nseg; i++, ds++) { 240 ds->ds_data = bf->bf_segs[i].ds_addr; 241 if (i == bf->bf_nseg - 1) 242 ds->ds_link = 0; 243 else 244 ds->ds_link = bf->bf_daddr + sizeof(*ds) * (i + 1); 245 ath_hal_filltxdesc(ah, ds 246 , bf->bf_segs[i].ds_len /* segment length */ 247 , i == 0 /* first segment */ 248 , i == bf->bf_nseg - 1 /* last segment */ 249 , ds0 /* first descriptor */ 250 ); 251 DPRINTF(sc, ATH_DEBUG_XMIT, 252 "%s: %d: %08x %08x %08x %08x %08x %08x\n", 253 __func__, i, ds->ds_link, ds->ds_data, 254 ds->ds_ctl0, ds->ds_ctl1, ds->ds_hw[0], ds->ds_hw[1]); 255 } 256 257 } 258 259 static void 260 ath_tx_handoff(struct ath_softc *sc, struct ath_txq *txq, struct ath_buf *bf) 261 { 262 struct ath_hal *ah = sc->sc_ah; 263 264 /* Fill in the details in the descriptor list */ 265 ath_tx_chaindesclist(sc, txq, bf); 266 267 /* 268 * Insert the frame on the outbound list and pass it on 269 * to the hardware. Multicast frames buffered for power 270 * save stations and transmit from the CAB queue are stored 271 * on a s/w only queue and loaded on to the CAB queue in 272 * the SWBA handler since frames only go out on DTIM and 273 * to avoid possible races. 274 */ 275 ATH_TXQ_LOCK(txq); 276 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0, 277 ("busy status 0x%x", bf->bf_flags)); 278 if (txq->axq_qnum != ATH_TXQ_SWQ) { 279 #ifdef IEEE80211_SUPPORT_TDMA 280 int qbusy; 281 282 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list); 283 qbusy = ath_hal_txqenabled(ah, txq->axq_qnum); 284 if (txq->axq_link == NULL) { 285 /* 286 * Be careful writing the address to TXDP. If 287 * the tx q is enabled then this write will be 288 * ignored. Normally this is not an issue but 289 * when tdma is in use and the q is beacon gated 290 * this race can occur. If the q is busy then 291 * defer the work to later--either when another 292 * packet comes along or when we prepare a beacon 293 * frame at SWBA. 294 */ 295 if (!qbusy) { 296 ath_hal_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr); 297 txq->axq_flags &= ~ATH_TXQ_PUTPENDING; 298 DPRINTF(sc, ATH_DEBUG_XMIT, 299 "%s: TXDP[%u] = %p (%p) depth %d\n", 300 __func__, txq->axq_qnum, 301 (caddr_t)bf->bf_daddr, bf->bf_desc, 302 txq->axq_depth); 303 } else { 304 txq->axq_flags |= ATH_TXQ_PUTPENDING; 305 DPRINTF(sc, ATH_DEBUG_TDMA | ATH_DEBUG_XMIT, 306 "%s: Q%u busy, defer enable\n", __func__, 307 txq->axq_qnum); 308 } 309 } else { 310 *txq->axq_link = bf->bf_daddr; 311 DPRINTF(sc, ATH_DEBUG_XMIT, 312 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__, 313 txq->axq_qnum, txq->axq_link, 314 (caddr_t)bf->bf_daddr, bf->bf_desc, txq->axq_depth); 315 if ((txq->axq_flags & ATH_TXQ_PUTPENDING) && !qbusy) { 316 /* 317 * The q was busy when we previously tried 318 * to write the address of the first buffer 319 * in the chain. Since it's not busy now 320 * handle this chore. We are certain the 321 * buffer at the front is the right one since 322 * axq_link is NULL only when the buffer list 323 * is/was empty. 324 */ 325 ath_hal_puttxbuf(ah, txq->axq_qnum, 326 STAILQ_FIRST(&txq->axq_q)->bf_daddr); 327 txq->axq_flags &= ~ATH_TXQ_PUTPENDING; 328 DPRINTF(sc, ATH_DEBUG_TDMA | ATH_DEBUG_XMIT, 329 "%s: Q%u restarted\n", __func__, 330 txq->axq_qnum); 331 } 332 } 333 #else 334 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list); 335 if (txq->axq_link == NULL) { 336 ath_hal_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr); 337 DPRINTF(sc, ATH_DEBUG_XMIT, 338 "%s: TXDP[%u] = %p (%p) depth %d\n", 339 __func__, txq->axq_qnum, 340 (caddr_t)bf->bf_daddr, bf->bf_desc, 341 txq->axq_depth); 342 } else { 343 *txq->axq_link = bf->bf_daddr; 344 DPRINTF(sc, ATH_DEBUG_XMIT, 345 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__, 346 txq->axq_qnum, txq->axq_link, 347 (caddr_t)bf->bf_daddr, bf->bf_desc, txq->axq_depth); 348 } 349 #endif /* IEEE80211_SUPPORT_TDMA */ 350 txq->axq_link = &bf->bf_desc[bf->bf_nseg - 1].ds_link; 351 ath_hal_txstart(ah, txq->axq_qnum); 352 } else { 353 if (txq->axq_link != NULL) { 354 struct ath_buf *last = ATH_TXQ_LAST(txq); 355 struct ieee80211_frame *wh; 356 357 /* mark previous frame */ 358 wh = mtod(last->bf_m, struct ieee80211_frame *); 359 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 360 bus_dmamap_sync(sc->sc_dmat, last->bf_dmamap, 361 BUS_DMASYNC_PREWRITE); 362 363 /* link descriptor */ 364 *txq->axq_link = bf->bf_daddr; 365 } 366 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list); 367 txq->axq_link = &bf->bf_desc[bf->bf_nseg - 1].ds_link; 368 } 369 ATH_TXQ_UNLOCK(txq); 370 } 371 372 static int 373 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni, 374 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen, int *keyix) 375 { 376 if (iswep) { 377 const struct ieee80211_cipher *cip; 378 struct ieee80211_key *k; 379 380 /* 381 * Construct the 802.11 header+trailer for an encrypted 382 * frame. The only reason this can fail is because of an 383 * unknown or unsupported cipher/key type. 384 */ 385 k = ieee80211_crypto_encap(ni, m0); 386 if (k == NULL) { 387 /* 388 * This can happen when the key is yanked after the 389 * frame was queued. Just discard the frame; the 390 * 802.11 layer counts failures and provides 391 * debugging/diagnostics. 392 */ 393 return 0; 394 } 395 /* 396 * Adjust the packet + header lengths for the crypto 397 * additions and calculate the h/w key index. When 398 * a s/w mic is done the frame will have had any mic 399 * added to it prior to entry so m0->m_pkthdr.len will 400 * account for it. Otherwise we need to add it to the 401 * packet length. 402 */ 403 cip = k->wk_cipher; 404 (*hdrlen) += cip->ic_header; 405 (*pktlen) += cip->ic_header + cip->ic_trailer; 406 /* NB: frags always have any TKIP MIC done in s/w */ 407 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag) 408 (*pktlen) += cip->ic_miclen; 409 (*keyix) = k->wk_keyix; 410 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) { 411 /* 412 * Use station key cache slot, if assigned. 413 */ 414 (*keyix) = ni->ni_ucastkey.wk_keyix; 415 if ((*keyix) == IEEE80211_KEYIX_NONE) 416 (*keyix) = HAL_TXKEYIX_INVALID; 417 } else 418 (*keyix) = HAL_TXKEYIX_INVALID; 419 420 return 1; 421 } 422 423 static uint8_t 424 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt, 425 int rix, int cix, int shortPreamble) 426 { 427 uint8_t ctsrate; 428 429 /* 430 * CTS transmit rate is derived from the transmit rate 431 * by looking in the h/w rate table. We must also factor 432 * in whether or not a short preamble is to be used. 433 */ 434 /* NB: cix is set above where RTS/CTS is enabled */ 435 KASSERT(cix != 0xff, ("cix not setup")); 436 ctsrate = rt->info[cix].rateCode; 437 438 /* XXX this should only matter for legacy rates */ 439 if (shortPreamble) 440 ctsrate |= rt->info[cix].shortPreamble; 441 442 return ctsrate; 443 } 444 445 446 /* 447 * Calculate the RTS/CTS duration for legacy frames. 448 */ 449 static int 450 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix, 451 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt, 452 int flags) 453 { 454 int ctsduration = 0; 455 456 /* This mustn't be called for HT modes */ 457 if (rt->info[cix].phy == IEEE80211_T_HT) { 458 printf("%s: HT rate where it shouldn't be (0x%x)\n", 459 __func__, rt->info[cix].rateCode); 460 return -1; 461 } 462 463 /* 464 * Compute the transmit duration based on the frame 465 * size and the size of an ACK frame. We call into the 466 * HAL to do the computation since it depends on the 467 * characteristics of the actual PHY being used. 468 * 469 * NB: CTS is assumed the same size as an ACK so we can 470 * use the precalculated ACK durations. 471 */ 472 if (shortPreamble) { 473 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */ 474 ctsduration += rt->info[cix].spAckDuration; 475 ctsduration += ath_hal_computetxtime(ah, 476 rt, pktlen, rix, AH_TRUE); 477 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */ 478 ctsduration += rt->info[rix].spAckDuration; 479 } else { 480 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */ 481 ctsduration += rt->info[cix].lpAckDuration; 482 ctsduration += ath_hal_computetxtime(ah, 483 rt, pktlen, rix, AH_FALSE); 484 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */ 485 ctsduration += rt->info[rix].lpAckDuration; 486 } 487 488 return ctsduration; 489 } 490 491 int 492 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf, 493 struct mbuf *m0) 494 { 495 struct ieee80211vap *vap = ni->ni_vap; 496 struct ath_vap *avp = ATH_VAP(vap); 497 struct ath_hal *ah = sc->sc_ah; 498 struct ifnet *ifp = sc->sc_ifp; 499 struct ieee80211com *ic = ifp->if_l2com; 500 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams; 501 int error, iswep, ismcast, isfrag, ismrr; 502 int keyix, hdrlen, pktlen, try0; 503 u_int8_t rix, txrate, ctsrate; 504 u_int8_t cix = 0xff; /* NB: silence compiler */ 505 struct ath_desc *ds; 506 struct ath_txq *txq; 507 struct ieee80211_frame *wh; 508 u_int subtype, flags, ctsduration; 509 HAL_PKT_TYPE atype; 510 const HAL_RATE_TABLE *rt; 511 HAL_BOOL shortPreamble; 512 struct ath_node *an; 513 u_int pri; 514 uint8_t try[4], rate[4]; 515 516 bzero(try, sizeof(try)); 517 bzero(rate, sizeof(rate)); 518 519 wh = mtod(m0, struct ieee80211_frame *); 520 iswep = wh->i_fc[1] & IEEE80211_FC1_WEP; 521 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1); 522 isfrag = m0->m_flags & M_FRAG; 523 hdrlen = ieee80211_anyhdrsize(wh); 524 /* 525 * Packet length must not include any 526 * pad bytes; deduct them here. 527 */ 528 pktlen = m0->m_pkthdr.len - (hdrlen & 3); 529 530 /* Handle encryption twiddling if needed */ 531 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen, &pktlen, &keyix)) { 532 ath_freetx(m0); 533 return EIO; 534 } 535 536 /* packet header may have moved, reset our local pointer */ 537 wh = mtod(m0, struct ieee80211_frame *); 538 539 pktlen += IEEE80211_CRC_LEN; 540 541 /* 542 * Load the DMA map so any coalescing is done. This 543 * also calculates the number of descriptors we need. 544 */ 545 error = ath_tx_dmasetup(sc, bf, m0); 546 if (error != 0) 547 return error; 548 bf->bf_node = ni; /* NB: held reference */ 549 m0 = bf->bf_m; /* NB: may have changed */ 550 wh = mtod(m0, struct ieee80211_frame *); 551 552 /* setup descriptors */ 553 ds = bf->bf_desc; 554 rt = sc->sc_currates; 555 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 556 557 /* 558 * NB: the 802.11 layer marks whether or not we should 559 * use short preamble based on the current mode and 560 * negotiated parameters. 561 */ 562 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 563 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { 564 shortPreamble = AH_TRUE; 565 sc->sc_stats.ast_tx_shortpre++; 566 } else { 567 shortPreamble = AH_FALSE; 568 } 569 570 an = ATH_NODE(ni); 571 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */ 572 ismrr = 0; /* default no multi-rate retry*/ 573 pri = M_WME_GETAC(m0); /* honor classification */ 574 /* XXX use txparams instead of fixed values */ 575 /* 576 * Calculate Atheros packet type from IEEE80211 packet header, 577 * setup for rate calculations, and select h/w transmit queue. 578 */ 579 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { 580 case IEEE80211_FC0_TYPE_MGT: 581 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 582 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) 583 atype = HAL_PKT_TYPE_BEACON; 584 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) 585 atype = HAL_PKT_TYPE_PROBE_RESP; 586 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM) 587 atype = HAL_PKT_TYPE_ATIM; 588 else 589 atype = HAL_PKT_TYPE_NORMAL; /* XXX */ 590 rix = an->an_mgmtrix; 591 txrate = rt->info[rix].rateCode; 592 if (shortPreamble) 593 txrate |= rt->info[rix].shortPreamble; 594 try0 = ATH_TXMGTTRY; 595 flags |= HAL_TXDESC_INTREQ; /* force interrupt */ 596 break; 597 case IEEE80211_FC0_TYPE_CTL: 598 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */ 599 rix = an->an_mgmtrix; 600 txrate = rt->info[rix].rateCode; 601 if (shortPreamble) 602 txrate |= rt->info[rix].shortPreamble; 603 try0 = ATH_TXMGTTRY; 604 flags |= HAL_TXDESC_INTREQ; /* force interrupt */ 605 break; 606 case IEEE80211_FC0_TYPE_DATA: 607 atype = HAL_PKT_TYPE_NORMAL; /* default */ 608 /* 609 * Data frames: multicast frames go out at a fixed rate, 610 * EAPOL frames use the mgmt frame rate; otherwise consult 611 * the rate control module for the rate to use. 612 */ 613 if (ismcast) { 614 rix = an->an_mcastrix; 615 txrate = rt->info[rix].rateCode; 616 if (shortPreamble) 617 txrate |= rt->info[rix].shortPreamble; 618 try0 = 1; 619 } else if (m0->m_flags & M_EAPOL) { 620 /* XXX? maybe always use long preamble? */ 621 rix = an->an_mgmtrix; 622 txrate = rt->info[rix].rateCode; 623 if (shortPreamble) 624 txrate |= rt->info[rix].shortPreamble; 625 try0 = ATH_TXMAXTRY; /* XXX?too many? */ 626 } else { 627 ath_rate_findrate(sc, an, shortPreamble, pktlen, 628 &rix, &try0, &txrate); 629 sc->sc_txrix = rix; /* for LED blinking */ 630 sc->sc_lastdatarix = rix; /* for fast frames */ 631 if (try0 != ATH_TXMAXTRY) 632 ismrr = 1; 633 } 634 if (cap->cap_wmeParams[pri].wmep_noackPolicy) 635 flags |= HAL_TXDESC_NOACK; 636 break; 637 default: 638 if_printf(ifp, "bogus frame type 0x%x (%s)\n", 639 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__); 640 /* XXX statistic */ 641 ath_freetx(m0); 642 return EIO; 643 } 644 txq = sc->sc_ac2q[pri]; 645 646 /* 647 * When servicing one or more stations in power-save mode 648 * (or) if there is some mcast data waiting on the mcast 649 * queue (to prevent out of order delivery) multicast 650 * frames must be buffered until after the beacon. 651 */ 652 if (ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) 653 txq = &avp->av_mcastq; 654 655 /* 656 * Calculate miscellaneous flags. 657 */ 658 if (ismcast) { 659 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */ 660 } else if (pktlen > vap->iv_rtsthreshold && 661 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) { 662 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */ 663 cix = rt->info[rix].controlRate; 664 sc->sc_stats.ast_tx_rts++; 665 } 666 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */ 667 sc->sc_stats.ast_tx_noack++; 668 #ifdef IEEE80211_SUPPORT_TDMA 669 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) { 670 DPRINTF(sc, ATH_DEBUG_TDMA, 671 "%s: discard frame, ACK required w/ TDMA\n", __func__); 672 sc->sc_stats.ast_tdma_ack++; 673 ath_freetx(m0); 674 return EIO; 675 } 676 #endif 677 678 /* 679 * If 802.11g protection is enabled, determine whether 680 * to use RTS/CTS or just CTS. Note that this is only 681 * done for OFDM unicast frames. 682 */ 683 if ((ic->ic_flags & IEEE80211_F_USEPROT) && 684 rt->info[rix].phy == IEEE80211_T_OFDM && 685 (flags & HAL_TXDESC_NOACK) == 0) { 686 /* XXX fragments must use CCK rates w/ protection */ 687 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) 688 flags |= HAL_TXDESC_RTSENA; 689 else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) 690 flags |= HAL_TXDESC_CTSENA; 691 if (isfrag) { 692 /* 693 * For frags it would be desirable to use the 694 * highest CCK rate for RTS/CTS. But stations 695 * farther away may detect it at a lower CCK rate 696 * so use the configured protection rate instead 697 * (for now). 698 */ 699 cix = rt->info[sc->sc_protrix].controlRate; 700 } else 701 cix = rt->info[sc->sc_protrix].controlRate; 702 sc->sc_stats.ast_tx_protect++; 703 } 704 705 #if 0 706 /* 707 * If 11n protection is enabled and it's a HT frame, 708 * enable RTS. 709 * 710 * XXX ic_htprotmode or ic_curhtprotmode? 711 * XXX should it_htprotmode only matter if ic_curhtprotmode 712 * XXX indicates it's not a HT pure environment? 713 */ 714 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) && 715 rt->info[rix].phy == IEEE80211_T_HT && 716 (flags & HAL_TXDESC_NOACK) == 0) { 717 cix = rt->info[sc->sc_protrix].controlRate; 718 flags |= HAL_TXDESC_RTSENA; 719 sc->sc_stats.ast_tx_htprotect++; 720 } 721 #endif 722 723 /* 724 * Calculate duration. This logically belongs in the 802.11 725 * layer but it lacks sufficient information to calculate it. 726 */ 727 if ((flags & HAL_TXDESC_NOACK) == 0 && 728 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) { 729 u_int16_t dur; 730 if (shortPreamble) 731 dur = rt->info[rix].spAckDuration; 732 else 733 dur = rt->info[rix].lpAckDuration; 734 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) { 735 dur += dur; /* additional SIFS+ACK */ 736 KASSERT(m0->m_nextpkt != NULL, ("no fragment")); 737 /* 738 * Include the size of next fragment so NAV is 739 * updated properly. The last fragment uses only 740 * the ACK duration 741 */ 742 dur += ath_hal_computetxtime(ah, rt, 743 m0->m_nextpkt->m_pkthdr.len, 744 rix, shortPreamble); 745 } 746 if (isfrag) { 747 /* 748 * Force hardware to use computed duration for next 749 * fragment by disabling multi-rate retry which updates 750 * duration based on the multi-rate duration table. 751 */ 752 ismrr = 0; 753 try0 = ATH_TXMGTTRY; /* XXX? */ 754 } 755 *(u_int16_t *)wh->i_dur = htole16(dur); 756 } 757 758 /* 759 * Calculate RTS/CTS rate and duration if needed. 760 */ 761 ctsduration = 0; 762 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA)) { 763 ctsrate = ath_tx_get_rtscts_rate(ah, rt, rix, cix, shortPreamble); 764 765 /* The 11n chipsets do ctsduration calculations for you */ 766 if (! ath_tx_is_11n(sc)) 767 ctsduration = ath_tx_calc_ctsduration(ah, rix, cix, shortPreamble, 768 pktlen, rt, flags); 769 /* 770 * Must disable multi-rate retry when using RTS/CTS. 771 */ 772 ismrr = 0; 773 try0 = ATH_TXMGTTRY; /* XXX */ 774 } else 775 ctsrate = 0; 776 777 /* 778 * At this point we are committed to sending the frame 779 * and we don't need to look at m_nextpkt; clear it in 780 * case this frame is part of frag chain. 781 */ 782 m0->m_nextpkt = NULL; 783 784 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT)) 785 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len, 786 sc->sc_hwmap[rix].ieeerate, -1); 787 788 if (ieee80211_radiotap_active_vap(vap)) { 789 u_int64_t tsf = ath_hal_gettsf64(ah); 790 791 sc->sc_tx_th.wt_tsf = htole64(tsf); 792 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags; 793 if (iswep) 794 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP; 795 if (isfrag) 796 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG; 797 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate; 798 sc->sc_tx_th.wt_txpower = ni->ni_txpower; 799 sc->sc_tx_th.wt_antenna = sc->sc_txantenna; 800 801 ieee80211_radiotap_tx(vap, m0); 802 } 803 804 /* 805 * Determine if a tx interrupt should be generated for 806 * this descriptor. We take a tx interrupt to reap 807 * descriptors when the h/w hits an EOL condition or 808 * when the descriptor is specifically marked to generate 809 * an interrupt. We periodically mark descriptors in this 810 * way to insure timely replenishing of the supply needed 811 * for sending frames. Defering interrupts reduces system 812 * load and potentially allows more concurrent work to be 813 * done but if done to aggressively can cause senders to 814 * backup. 815 * 816 * NB: use >= to deal with sc_txintrperiod changing 817 * dynamically through sysctl. 818 */ 819 if (flags & HAL_TXDESC_INTREQ) { 820 txq->axq_intrcnt = 0; 821 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) { 822 flags |= HAL_TXDESC_INTREQ; 823 txq->axq_intrcnt = 0; 824 } 825 826 if (ath_tx_is_11n(sc)) { 827 rate[0] = rix; 828 try[0] = try0; 829 } 830 831 /* 832 * Formulate first tx descriptor with tx controls. 833 */ 834 /* XXX check return value? */ 835 /* XXX is this ok to call for 11n descriptors? */ 836 /* XXX or should it go through the first, next, last 11n calls? */ 837 ath_hal_setuptxdesc(ah, ds 838 , pktlen /* packet length */ 839 , hdrlen /* header length */ 840 , atype /* Atheros packet type */ 841 , ni->ni_txpower /* txpower */ 842 , txrate, try0 /* series 0 rate/tries */ 843 , keyix /* key cache index */ 844 , sc->sc_txantenna /* antenna mode */ 845 , flags /* flags */ 846 , ctsrate /* rts/cts rate */ 847 , ctsduration /* rts/cts duration */ 848 ); 849 bf->bf_txflags = flags; 850 /* 851 * Setup the multi-rate retry state only when we're 852 * going to use it. This assumes ath_hal_setuptxdesc 853 * initializes the descriptors (so we don't have to) 854 * when the hardware supports multi-rate retry and 855 * we don't use it. 856 */ 857 if (ismrr) { 858 if (ath_tx_is_11n(sc)) 859 ath_rate_getxtxrates(sc, an, rix, rate, try); 860 else 861 ath_rate_setupxtxdesc(sc, an, ds, shortPreamble, rix); 862 } 863 864 if (ath_tx_is_11n(sc)) { 865 ath_buf_set_rate(sc, ni, bf, pktlen, flags, ctsrate, (atype == HAL_PKT_TYPE_PSPOLL), rate, try); 866 } 867 868 ath_tx_handoff(sc, txq, bf); 869 return 0; 870 } 871 872 static int 873 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni, 874 struct ath_buf *bf, struct mbuf *m0, 875 const struct ieee80211_bpf_params *params) 876 { 877 struct ifnet *ifp = sc->sc_ifp; 878 struct ieee80211com *ic = ifp->if_l2com; 879 struct ath_hal *ah = sc->sc_ah; 880 struct ieee80211vap *vap = ni->ni_vap; 881 int error, ismcast, ismrr; 882 int keyix, hdrlen, pktlen, try0, txantenna; 883 u_int8_t rix, cix, txrate, ctsrate, rate1, rate2, rate3; 884 struct ieee80211_frame *wh; 885 u_int flags, ctsduration; 886 HAL_PKT_TYPE atype; 887 const HAL_RATE_TABLE *rt; 888 struct ath_desc *ds; 889 u_int pri; 890 uint8_t try[4], rate[4]; 891 892 bzero(try, sizeof(try)); 893 bzero(rate, sizeof(rate)); 894 895 wh = mtod(m0, struct ieee80211_frame *); 896 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1); 897 hdrlen = ieee80211_anyhdrsize(wh); 898 /* 899 * Packet length must not include any 900 * pad bytes; deduct them here. 901 */ 902 /* XXX honor IEEE80211_BPF_DATAPAD */ 903 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN; 904 905 /* Handle encryption twiddling if needed */ 906 if (! ath_tx_tag_crypto(sc, ni, m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0, &hdrlen, &pktlen, &keyix)) { 907 ath_freetx(m0); 908 return EIO; 909 } 910 /* packet header may have moved, reset our local pointer */ 911 wh = mtod(m0, struct ieee80211_frame *); 912 913 error = ath_tx_dmasetup(sc, bf, m0); 914 if (error != 0) 915 return error; 916 m0 = bf->bf_m; /* NB: may have changed */ 917 wh = mtod(m0, struct ieee80211_frame *); 918 bf->bf_node = ni; /* NB: held reference */ 919 920 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */ 921 flags |= HAL_TXDESC_INTREQ; /* force interrupt */ 922 if (params->ibp_flags & IEEE80211_BPF_RTS) 923 flags |= HAL_TXDESC_RTSENA; 924 else if (params->ibp_flags & IEEE80211_BPF_CTS) 925 flags |= HAL_TXDESC_CTSENA; 926 /* XXX leave ismcast to injector? */ 927 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast) 928 flags |= HAL_TXDESC_NOACK; 929 930 rt = sc->sc_currates; 931 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode)); 932 rix = ath_tx_findrix(sc, params->ibp_rate0); 933 txrate = rt->info[rix].rateCode; 934 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE) 935 txrate |= rt->info[rix].shortPreamble; 936 sc->sc_txrix = rix; 937 try0 = params->ibp_try0; 938 ismrr = (params->ibp_try1 != 0); 939 txantenna = params->ibp_pri >> 2; 940 if (txantenna == 0) /* XXX? */ 941 txantenna = sc->sc_txantenna; 942 943 ctsduration = 0; 944 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA)) { 945 cix = ath_tx_findrix(sc, params->ibp_ctsrate); 946 ctsrate = ath_tx_get_rtscts_rate(ah, rt, rix, cix, params->ibp_flags & IEEE80211_BPF_SHORTPRE); 947 /* The 11n chipsets do ctsduration calculations for you */ 948 if (! ath_tx_is_11n(sc)) 949 ctsduration = ath_tx_calc_ctsduration(ah, rix, cix, 950 params->ibp_flags & IEEE80211_BPF_SHORTPRE, pktlen, 951 rt, flags); 952 /* 953 * Must disable multi-rate retry when using RTS/CTS. 954 */ 955 ismrr = 0; /* XXX */ 956 } else 957 ctsrate = 0; 958 959 pri = params->ibp_pri & 3; 960 /* 961 * NB: we mark all packets as type PSPOLL so the h/w won't 962 * set the sequence number, duration, etc. 963 */ 964 atype = HAL_PKT_TYPE_PSPOLL; 965 966 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT)) 967 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len, 968 sc->sc_hwmap[rix].ieeerate, -1); 969 970 if (ieee80211_radiotap_active_vap(vap)) { 971 u_int64_t tsf = ath_hal_gettsf64(ah); 972 973 sc->sc_tx_th.wt_tsf = htole64(tsf); 974 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags; 975 if (wh->i_fc[1] & IEEE80211_FC1_WEP) 976 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP; 977 if (m0->m_flags & M_FRAG) 978 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG; 979 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate; 980 sc->sc_tx_th.wt_txpower = ni->ni_txpower; 981 sc->sc_tx_th.wt_antenna = sc->sc_txantenna; 982 983 ieee80211_radiotap_tx(vap, m0); 984 } 985 986 /* 987 * Formulate first tx descriptor with tx controls. 988 */ 989 ds = bf->bf_desc; 990 /* XXX check return value? */ 991 ath_hal_setuptxdesc(ah, ds 992 , pktlen /* packet length */ 993 , hdrlen /* header length */ 994 , atype /* Atheros packet type */ 995 , params->ibp_power /* txpower */ 996 , txrate, try0 /* series 0 rate/tries */ 997 , keyix /* key cache index */ 998 , txantenna /* antenna mode */ 999 , flags /* flags */ 1000 , ctsrate /* rts/cts rate */ 1001 , ctsduration /* rts/cts duration */ 1002 ); 1003 bf->bf_txflags = flags; 1004 1005 if (ath_tx_is_11n(sc)) { 1006 rate[0] = ath_tx_findrix(sc, params->ibp_rate0); 1007 try[0] = params->ibp_try0; 1008 1009 if (ismrr) { 1010 /* Remember, rate[] is actually an array of rix's -adrian */ 1011 rate[0] = ath_tx_findrix(sc, params->ibp_rate0); 1012 rate[1] = ath_tx_findrix(sc, params->ibp_rate1); 1013 rate[2] = ath_tx_findrix(sc, params->ibp_rate2); 1014 rate[3] = ath_tx_findrix(sc, params->ibp_rate3); 1015 1016 try[0] = params->ibp_try0; 1017 try[1] = params->ibp_try1; 1018 try[2] = params->ibp_try2; 1019 try[3] = params->ibp_try3; 1020 } 1021 } else { 1022 if (ismrr) { 1023 rix = ath_tx_findrix(sc, params->ibp_rate1); 1024 rate1 = rt->info[rix].rateCode; 1025 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE) 1026 rate1 |= rt->info[rix].shortPreamble; 1027 if (params->ibp_try2) { 1028 rix = ath_tx_findrix(sc, params->ibp_rate2); 1029 rate2 = rt->info[rix].rateCode; 1030 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE) 1031 rate2 |= rt->info[rix].shortPreamble; 1032 } else 1033 rate2 = 0; 1034 if (params->ibp_try3) { 1035 rix = ath_tx_findrix(sc, params->ibp_rate3); 1036 rate3 = rt->info[rix].rateCode; 1037 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE) 1038 rate3 |= rt->info[rix].shortPreamble; 1039 } else 1040 rate3 = 0; 1041 ath_hal_setupxtxdesc(ah, ds 1042 , rate1, params->ibp_try1 /* series 1 */ 1043 , rate2, params->ibp_try2 /* series 2 */ 1044 , rate3, params->ibp_try3 /* series 3 */ 1045 ); 1046 } 1047 } 1048 1049 if (ath_tx_is_11n(sc)) { 1050 /* 1051 * notice that rix doesn't include any of the "magic" flags txrate 1052 * does for communicating "other stuff" to the HAL. 1053 */ 1054 ath_buf_set_rate(sc, ni, bf, pktlen, flags, ctsrate, (atype == HAL_PKT_TYPE_PSPOLL), rate, try); 1055 } 1056 1057 /* NB: no buffered multicast in power save support */ 1058 ath_tx_handoff(sc, sc->sc_ac2q[pri], bf); 1059 return 0; 1060 } 1061 1062 int 1063 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m, 1064 const struct ieee80211_bpf_params *params) 1065 { 1066 struct ieee80211com *ic = ni->ni_ic; 1067 struct ifnet *ifp = ic->ic_ifp; 1068 struct ath_softc *sc = ifp->if_softc; 1069 struct ath_buf *bf; 1070 int error; 1071 1072 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || sc->sc_invalid) { 1073 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, %s", __func__, 1074 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ? 1075 "!running" : "invalid"); 1076 m_freem(m); 1077 error = ENETDOWN; 1078 goto bad; 1079 } 1080 /* 1081 * Grab a TX buffer and associated resources. 1082 */ 1083 bf = ath_getbuf(sc); 1084 if (bf == NULL) { 1085 sc->sc_stats.ast_tx_nobuf++; 1086 m_freem(m); 1087 error = ENOBUFS; 1088 goto bad; 1089 } 1090 1091 if (params == NULL) { 1092 /* 1093 * Legacy path; interpret frame contents to decide 1094 * precisely how to send the frame. 1095 */ 1096 if (ath_tx_start(sc, ni, bf, m)) { 1097 error = EIO; /* XXX */ 1098 goto bad2; 1099 } 1100 } else { 1101 /* 1102 * Caller supplied explicit parameters to use in 1103 * sending the frame. 1104 */ 1105 if (ath_tx_raw_start(sc, ni, bf, m, params)) { 1106 error = EIO; /* XXX */ 1107 goto bad2; 1108 } 1109 } 1110 sc->sc_wd_timer = 5; 1111 ifp->if_opackets++; 1112 sc->sc_stats.ast_tx_raw++; 1113 1114 return 0; 1115 bad2: 1116 ATH_TXBUF_LOCK(sc); 1117 STAILQ_INSERT_HEAD(&sc->sc_txbuf, bf, bf_list); 1118 ATH_TXBUF_UNLOCK(sc); 1119 bad: 1120 ifp->if_oerrors++; 1121 sc->sc_stats.ast_tx_raw_fail++; 1122 ieee80211_free_node(ni); 1123 return error; 1124 }
Cache object: 62eb3f43179946c069f092ab63a88e0e
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