2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
5 * Copyright (c) 2010-2012 Adrian Chadd, Xenion Pty Ltd
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer,
13 * without modification.
14 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
15 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
16 * redistribution must be conditioned upon including a substantially
17 * similar Disclaimer requirement for further binary redistribution.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
23 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
24 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30 * THE POSSIBILITY OF SUCH DAMAGES.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
37 * Driver for the Atheros Wireless LAN controller.
39 * This software is derived from work of Atsushi Onoe; his contribution
40 * is greatly appreciated.
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/sysctl.h>
51 #include <sys/malloc.h>
53 #include <sys/mutex.h>
54 #include <sys/kernel.h>
55 #include <sys/socket.h>
56 #include <sys/sockio.h>
57 #include <sys/errno.h>
58 #include <sys/callout.h>
60 #include <sys/endian.h>
61 #include <sys/kthread.h>
62 #include <sys/taskqueue.h>
66 #include <machine/bus.h>
69 #include <net/if_var.h>
70 #include <net/if_dl.h>
71 #include <net/if_media.h>
72 #include <net/if_types.h>
73 #include <net/if_arp.h>
74 #include <net/ethernet.h>
75 #include <net/if_llc.h>
77 #include <net80211/ieee80211_var.h>
78 #include <net80211/ieee80211_regdomain.h>
79 #ifdef IEEE80211_SUPPORT_SUPERG
80 #include <net80211/ieee80211_superg.h>
82 #ifdef IEEE80211_SUPPORT_TDMA
83 #include <net80211/ieee80211_tdma.h>
85 #include <net80211/ieee80211_ht.h>
90 #include <netinet/in.h>
91 #include <netinet/if_ether.h>
94 #include <dev/ath/if_athvar.h>
95 #include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
96 #include <dev/ath/ath_hal/ah_diagcodes.h>
98 #include <dev/ath/if_ath_debug.h>
101 #include <dev/ath/ath_tx99/ath_tx99.h>
104 #include <dev/ath/if_ath_misc.h>
105 #include <dev/ath/if_ath_tx.h>
106 #include <dev/ath/if_ath_tx_ht.h>
109 #include <dev/ath/if_ath_alq.h>
113 * How many retries to perform in software
115 #define SWMAX_RETRIES 10
118 * What queue to throw the non-QoS TID traffic into
120 #define ATH_NONQOS_TID_AC WME_AC_VO
123 static int ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an);
125 static int ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an,
127 static int ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an,
129 static ieee80211_seq ath_tx_tid_seqno_assign(struct ath_softc *sc,
130 struct ieee80211_node *ni, struct ath_buf *bf, struct mbuf *m0);
131 static int ath_tx_action_frame_override_queue(struct ath_softc *sc,
132 struct ieee80211_node *ni, struct mbuf *m0, int *tid);
133 static struct ath_buf *
134 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
135 struct ath_tid *tid, struct ath_buf *bf);
139 ath_tx_alq_post(struct ath_softc *sc, struct ath_buf *bf_first)
145 /* XXX we should skip out early if debugging isn't enabled! */
149 /* XXX should ensure bf_nseg > 0! */
150 if (bf->bf_nseg == 0)
152 n = ((bf->bf_nseg - 1) / sc->sc_tx_nmaps) + 1;
153 for (i = 0, ds = (const char *) bf->bf_desc;
155 i++, ds += sc->sc_tx_desclen) {
156 if_ath_alq_post(&sc->sc_alq,
164 #endif /* ATH_DEBUG_ALQ */
167 * Whether to use the 11n rate scenario functions or not
170 ath_tx_is_11n(struct ath_softc *sc)
172 return ((sc->sc_ah->ah_magic == 0x20065416) ||
173 (sc->sc_ah->ah_magic == 0x19741014));
177 * Obtain the current TID from the given frame.
179 * Non-QoS frames get mapped to a TID so frames consistently
180 * go on a sensible queue.
183 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
185 const struct ieee80211_frame *wh;
187 wh = mtod(m0, const struct ieee80211_frame *);
189 /* Non-QoS: map frame to a TID queue for software queueing */
190 if (! IEEE80211_QOS_HAS_SEQ(wh))
191 return (WME_AC_TO_TID(M_WME_GETAC(m0)));
193 /* QoS - fetch the TID from the header, ignore mbuf WME */
194 return (ieee80211_gettid(wh));
198 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
200 struct ieee80211_frame *wh;
202 wh = mtod(bf->bf_m, struct ieee80211_frame *);
203 /* Only update/resync if needed */
204 if (bf->bf_state.bfs_isretried == 0) {
205 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
206 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
207 BUS_DMASYNC_PREWRITE);
209 bf->bf_state.bfs_isretried = 1;
210 bf->bf_state.bfs_retries ++;
214 * Determine what the correct AC queue for the given frame
217 * For QoS frames, obey the TID. That way things like
218 * management frames that are related to a given TID
219 * are thus serialised with the rest of the TID traffic,
220 * regardless of net80211 overriding priority.
222 * For non-QoS frames, return the mbuf WMI priority.
224 * This has implications that higher priority non-QoS traffic
225 * may end up being scheduled before other non-QoS traffic,
226 * leading to out-of-sequence packets being emitted.
228 * (It'd be nice to log/count this so we can see if it
229 * really is a problem.)
231 * TODO: maybe we should throw multicast traffic, QoS or
232 * otherwise, into a separate TX queue?
235 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
237 const struct ieee80211_frame *wh;
239 wh = mtod(m0, const struct ieee80211_frame *);
242 * QoS data frame (sequence number or otherwise) -
243 * return hardware queue mapping for the underlying
246 if (IEEE80211_QOS_HAS_SEQ(wh))
247 return TID_TO_WME_AC(ieee80211_gettid(wh));
250 * Otherwise - return mbuf QoS pri.
252 return (M_WME_GETAC(m0));
256 ath_txfrag_cleanup(struct ath_softc *sc,
257 ath_bufhead *frags, struct ieee80211_node *ni)
259 struct ath_buf *bf, *next;
261 ATH_TXBUF_LOCK_ASSERT(sc);
263 TAILQ_FOREACH_SAFE(bf, frags, bf_list, next) {
264 /* NB: bf assumed clean */
265 TAILQ_REMOVE(frags, bf, bf_list);
266 ath_returnbuf_head(sc, bf);
267 ieee80211_node_decref(ni);
272 * Setup xmit of a fragmented frame. Allocate a buffer
273 * for each frag and bump the node reference count to
274 * reflect the held reference to be setup by ath_tx_start.
277 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
278 struct mbuf *m0, struct ieee80211_node *ni)
284 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
285 /* XXX non-management? */
286 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
287 if (bf == NULL) { /* out of buffers, cleanup */
288 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
290 ath_txfrag_cleanup(sc, frags, ni);
293 ieee80211_node_incref(ni);
294 TAILQ_INSERT_TAIL(frags, bf, bf_list);
296 ATH_TXBUF_UNLOCK(sc);
298 return !TAILQ_EMPTY(frags);
302 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
308 * Load the DMA map so any coalescing is done. This
309 * also calculates the number of descriptors we need.
311 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
312 bf->bf_segs, &bf->bf_nseg,
314 if (error == EFBIG) {
315 /* XXX packet requires too many descriptors */
316 bf->bf_nseg = ATH_MAX_SCATTER + 1;
317 } else if (error != 0) {
318 sc->sc_stats.ast_tx_busdma++;
319 ieee80211_free_mbuf(m0);
323 * Discard null packets and check for packets that
324 * require too many TX descriptors. We try to convert
325 * the latter to a cluster.
327 if (bf->bf_nseg > ATH_MAX_SCATTER) { /* too many desc's, linearize */
328 sc->sc_stats.ast_tx_linear++;
329 m = m_collapse(m0, M_NOWAIT, ATH_MAX_SCATTER);
331 ieee80211_free_mbuf(m0);
332 sc->sc_stats.ast_tx_nombuf++;
336 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
337 bf->bf_segs, &bf->bf_nseg,
340 sc->sc_stats.ast_tx_busdma++;
341 ieee80211_free_mbuf(m0);
344 KASSERT(bf->bf_nseg <= ATH_MAX_SCATTER,
345 ("too many segments after defrag; nseg %u", bf->bf_nseg));
346 } else if (bf->bf_nseg == 0) { /* null packet, discard */
347 sc->sc_stats.ast_tx_nodata++;
348 ieee80211_free_mbuf(m0);
351 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
352 __func__, m0, m0->m_pkthdr.len);
353 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
360 * Chain together segments+descriptors for a frame - 11n or otherwise.
362 * For aggregates, this is called on each frame in the aggregate.
365 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
366 struct ath_buf *bf, int is_aggr, int is_first_subframe,
367 int is_last_subframe)
369 struct ath_hal *ah = sc->sc_ah;
372 HAL_DMA_ADDR bufAddrList[4];
373 uint32_t segLenList[4];
378 * XXX There's txdma and txdma_mgmt; the descriptor
381 struct ath_descdma *dd = &sc->sc_txdma;
384 * Fillin the remainder of the descriptor info.
388 * We need the number of TX data pointers in each descriptor.
389 * EDMA and later chips support 4 TX buffers per descriptor;
390 * previous chips just support one.
392 numTxMaps = sc->sc_tx_nmaps;
395 * For EDMA and later chips ensure the TX map is fully populated
396 * before advancing to the next descriptor.
398 ds = (char *) bf->bf_desc;
400 bzero(bufAddrList, sizeof(bufAddrList));
401 bzero(segLenList, sizeof(segLenList));
402 for (i = 0; i < bf->bf_nseg; i++) {
403 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
404 segLenList[bp] = bf->bf_segs[i].ds_len;
408 * Go to the next segment if this isn't the last segment
409 * and there's space in the current TX map.
411 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
415 * Last segment or we're out of buffer pointers.
419 if (i == bf->bf_nseg - 1)
420 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
422 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
423 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
426 * XXX This assumes that bfs_txq is the actual destination
427 * hardware queue at this point. It may not have been
428 * assigned, it may actually be pointing to the multicast
429 * software TXQ id. These must be fixed!
431 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
434 , bf->bf_descid /* XXX desc id */
435 , bf->bf_state.bfs_tx_queue
436 , isFirstDesc /* first segment */
437 , i == bf->bf_nseg - 1 /* last segment */
438 , (struct ath_desc *) ds0 /* first descriptor */
442 * Make sure the 11n aggregate fields are cleared.
444 * XXX TODO: this doesn't need to be called for
445 * aggregate frames; as it'll be called on all
446 * sub-frames. Since the descriptors are in
447 * non-cacheable memory, this leads to some
448 * rather slow writes on MIPS/ARM platforms.
450 if (ath_tx_is_11n(sc))
451 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
454 * If 11n is enabled, set it up as if it's an aggregate
457 if (is_last_subframe) {
458 ath_hal_set11n_aggr_last(sc->sc_ah,
459 (struct ath_desc *) ds);
460 } else if (is_aggr) {
462 * This clears the aggrlen field; so
463 * the caller needs to call set_aggr_first()!
465 * XXX TODO: don't call this for the first
466 * descriptor in the first frame in an
469 ath_hal_set11n_aggr_middle(sc->sc_ah,
470 (struct ath_desc *) ds,
471 bf->bf_state.bfs_ndelim);
474 bf->bf_lastds = (struct ath_desc *) ds;
477 * Don't forget to skip to the next descriptor.
479 ds += sc->sc_tx_desclen;
483 * .. and don't forget to blank these out!
485 bzero(bufAddrList, sizeof(bufAddrList));
486 bzero(segLenList, sizeof(segLenList));
488 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
492 * Set the rate control fields in the given descriptor based on
493 * the bf_state fields and node state.
495 * The bfs fields should already be set with the relevant rate
496 * control information, including whether MRR is to be enabled.
498 * Since the FreeBSD HAL currently sets up the first TX rate
499 * in ath_hal_setuptxdesc(), this will setup the MRR
500 * conditionally for the pre-11n chips, and call ath_buf_set_rate
501 * unconditionally for 11n chips. These require the 11n rate
502 * scenario to be set if MCS rates are enabled, so it's easier
503 * to just always call it. The caller can then only set rates 2, 3
504 * and 4 if multi-rate retry is needed.
507 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
510 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
512 /* If mrr is disabled, blank tries 1, 2, 3 */
513 if (! bf->bf_state.bfs_ismrr)
514 rc[1].tries = rc[2].tries = rc[3].tries = 0;
518 * If NOACK is set, just set ntries=1.
520 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
521 rc[1].tries = rc[2].tries = rc[3].tries = 0;
527 * Always call - that way a retried descriptor will
528 * have the MRR fields overwritten.
530 * XXX TODO: see if this is really needed - setting up
531 * the first descriptor should set the MRR fields to 0
534 if (ath_tx_is_11n(sc)) {
535 ath_buf_set_rate(sc, ni, bf);
537 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
538 , rc[1].ratecode, rc[1].tries
539 , rc[2].ratecode, rc[2].tries
540 , rc[3].ratecode, rc[3].tries
546 * Setup segments+descriptors for an 11n aggregate.
547 * bf_first is the first buffer in the aggregate.
548 * The descriptor list must already been linked together using
552 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
554 struct ath_buf *bf, *bf_prev = NULL;
555 struct ath_desc *ds0 = bf_first->bf_desc;
557 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
558 __func__, bf_first->bf_state.bfs_nframes,
559 bf_first->bf_state.bfs_al);
563 if (bf->bf_state.bfs_txrate0 == 0)
564 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
566 if (bf->bf_state.bfs_rc[0].ratecode == 0)
567 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
571 * Setup all descriptors of all subframes - this will
572 * call ath_hal_set11naggrmiddle() on every frame.
575 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
576 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
577 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
578 SEQNO(bf->bf_state.bfs_seqno));
581 * Setup the initial fields for the first descriptor - all
582 * the non-11n specific stuff.
584 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
585 , bf->bf_state.bfs_pktlen /* packet length */
586 , bf->bf_state.bfs_hdrlen /* header length */
587 , bf->bf_state.bfs_atype /* Atheros packet type */
588 , bf->bf_state.bfs_txpower /* txpower */
589 , bf->bf_state.bfs_txrate0
590 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
591 , bf->bf_state.bfs_keyix /* key cache index */
592 , bf->bf_state.bfs_txantenna /* antenna mode */
593 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
594 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
595 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
599 * First descriptor? Setup the rate control and initial
600 * aggregate header information.
602 if (bf == bf_first) {
604 * setup first desc with rate and aggr info
606 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
610 * Setup the descriptors for a multi-descriptor frame.
611 * This is both aggregate and non-aggregate aware.
613 ath_tx_chaindesclist(sc, ds0, bf,
615 !! (bf == bf_first), /* is_first_subframe */
616 !! (bf->bf_next == NULL) /* is_last_subframe */
619 if (bf == bf_first) {
621 * Initialise the first 11n aggregate with the
622 * aggregate length and aggregate enable bits.
624 ath_hal_set11n_aggr_first(sc->sc_ah,
627 bf->bf_state.bfs_ndelim);
631 * Link the last descriptor of the previous frame
632 * to the beginning descriptor of this frame.
635 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
638 /* Save a copy so we can link the next descriptor in */
644 * Set the first descriptor bf_lastds field to point to
645 * the last descriptor in the last subframe, that's where
646 * the status update will occur.
648 bf_first->bf_lastds = bf_prev->bf_lastds;
651 * And bf_last in the first descriptor points to the end of
652 * the aggregate list.
654 bf_first->bf_last = bf_prev;
657 * For non-AR9300 NICs, which require the rate control
658 * in the final descriptor - let's set that up now.
660 * This is because the filltxdesc() HAL call doesn't
661 * populate the last segment with rate control information
662 * if firstSeg is also true. For non-aggregate frames
663 * that is fine, as the first frame already has rate control
664 * info. But if the last frame in an aggregate has one
665 * descriptor, both firstseg and lastseg will be true and
666 * the rate info isn't copied.
668 * This is inefficient on MIPS/ARM platforms that have
669 * non-cachable memory for TX descriptors, but we'll just
672 * As to why the rate table is stashed in the last descriptor
673 * rather than the first descriptor? Because proctxdesc()
674 * is called on the final descriptor in an MPDU or A-MPDU -
675 * ie, the one that gets updated by the hardware upon
676 * completion. That way proctxdesc() doesn't need to know
677 * about the first _and_ last TX descriptor.
679 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
681 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
685 * Hand-off a frame to the multicast TX queue.
687 * This is a software TXQ which will be appended to the CAB queue
688 * during the beacon setup code.
690 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
691 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
692 * with the actual hardware txq, or all of this will fall apart.
694 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
695 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
699 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
702 ATH_TX_LOCK_ASSERT(sc);
704 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
705 ("%s: busy status 0x%x", __func__, bf->bf_flags));
708 * Ensure that the tx queue is the cabq, so things get
711 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
712 DPRINTF(sc, ATH_DEBUG_XMIT,
713 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
714 __func__, bf, bf->bf_state.bfs_tx_queue,
719 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
720 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
721 struct ieee80211_frame *wh;
723 /* mark previous frame */
724 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
725 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
726 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
727 BUS_DMASYNC_PREWRITE);
729 /* link descriptor */
730 ath_hal_settxdesclink(sc->sc_ah,
734 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
739 * Hand-off packet to a hardware queue.
742 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
745 struct ath_hal *ah = sc->sc_ah;
746 struct ath_buf *bf_first;
749 * Insert the frame on the outbound list and pass it on
750 * to the hardware. Multicast frames buffered for power
751 * save stations and transmit from the CAB queue are stored
752 * on a s/w only queue and loaded on to the CAB queue in
753 * the SWBA handler since frames only go out on DTIM and
754 * to avoid possible races.
756 ATH_TX_LOCK_ASSERT(sc);
757 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
758 ("%s: busy status 0x%x", __func__, bf->bf_flags));
759 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
760 ("ath_tx_handoff_hw called for mcast queue"));
763 * XXX We should instead just verify that sc_txstart_cnt
764 * or ath_txproc_cnt > 0. That would mean that
765 * the reset is going to be waiting for us to complete.
767 if (sc->sc_txproc_cnt == 0 && sc->sc_txstart_cnt == 0) {
768 device_printf(sc->sc_dev,
769 "%s: TX dispatch without holding txcount/txstart refcnt!\n",
774 * XXX .. this is going to cause the hardware to get upset;
775 * so we really should find some way to drop or queue
782 * XXX TODO: if there's a holdingbf, then
783 * ATH_TXQ_PUTRUNNING should be clear.
785 * If there is a holdingbf and the list is empty,
786 * then axq_link should be pointing to the holdingbf.
788 * Otherwise it should point to the last descriptor
789 * in the last ath_buf.
791 * In any case, we should really ensure that we
792 * update the previous descriptor link pointer to
793 * this descriptor, regardless of all of the above state.
795 * For now this is captured by having axq_link point
796 * to either the holdingbf (if the TXQ list is empty)
797 * or the end of the list (if the TXQ list isn't empty.)
798 * I'd rather just kill axq_link here and do it as above.
802 * Append the frame to the TX queue.
804 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
805 ATH_KTR(sc, ATH_KTR_TX, 3,
806 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
813 * If there's a link pointer, update it.
815 * XXX we should replace this with the above logic, just
816 * to kill axq_link with fire.
818 if (txq->axq_link != NULL) {
819 *txq->axq_link = bf->bf_daddr;
820 DPRINTF(sc, ATH_DEBUG_XMIT,
821 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
822 txq->axq_qnum, txq->axq_link,
823 (caddr_t)bf->bf_daddr, bf->bf_desc,
825 ATH_KTR(sc, ATH_KTR_TX, 5,
826 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
828 txq->axq_qnum, txq->axq_link,
829 (caddr_t)bf->bf_daddr, bf->bf_desc,
834 * If we've not pushed anything into the hardware yet,
835 * push the head of the queue into the TxDP.
837 * Once we've started DMA, there's no guarantee that
838 * updating the TxDP with a new value will actually work.
839 * So we just don't do that - if we hit the end of the list,
840 * we keep that buffer around (the "holding buffer") and
841 * re-start DMA by updating the link pointer of _that_
842 * descriptor and then restart DMA.
844 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
845 bf_first = TAILQ_FIRST(&txq->axq_q);
846 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
847 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
848 DPRINTF(sc, ATH_DEBUG_XMIT,
849 "%s: TXDP[%u] = %p (%p) depth %d\n",
850 __func__, txq->axq_qnum,
851 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
853 ATH_KTR(sc, ATH_KTR_TX, 5,
854 "ath_tx_handoff: TXDP[%u] = %p (%p) "
855 "lastds=%p depth %d",
857 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
863 * Ensure that the bf TXQ matches this TXQ, so later
864 * checking and holding buffer manipulation is sane.
866 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
867 DPRINTF(sc, ATH_DEBUG_XMIT,
868 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
869 __func__, bf, bf->bf_state.bfs_tx_queue,
874 * Track aggregate queue depth.
876 if (bf->bf_state.bfs_aggr)
877 txq->axq_aggr_depth++;
880 * Update the link pointer.
882 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
887 * If we wrote a TxDP above, DMA will start from here.
889 * If DMA is running, it'll do nothing.
891 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
892 * or VEOL) then it stops at the last transmitted write.
893 * We then append a new frame by updating the link pointer
894 * in that descriptor and then kick TxE here; it will re-read
895 * that last descriptor and find the new descriptor to transmit.
897 * This is why we keep the holding descriptor around.
899 ath_hal_txstart(ah, txq->axq_qnum);
901 ATH_KTR(sc, ATH_KTR_TX, 1,
902 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
906 * Restart TX DMA for the given TXQ.
908 * This must be called whether the queue is empty or not.
911 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
913 struct ath_buf *bf, *bf_last;
915 ATH_TXQ_LOCK_ASSERT(txq);
917 /* XXX make this ATH_TXQ_FIRST */
918 bf = TAILQ_FIRST(&txq->axq_q);
919 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
924 DPRINTF(sc, ATH_DEBUG_RESET,
925 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
930 (uint32_t) bf->bf_daddr);
933 if (sc->sc_debug & ATH_DEBUG_RESET)
934 ath_tx_dump(sc, txq);
938 * This is called from a restart, so DMA is known to be
939 * completely stopped.
941 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
942 ("%s: Q%d: called with PUTRUNNING=1\n",
946 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
947 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
949 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
951 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
955 * Hand off a packet to the hardware (or mcast queue.)
957 * The relevant hardware txq should be locked.
960 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
963 ATH_TX_LOCK_ASSERT(sc);
966 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
967 ath_tx_alq_post(sc, bf);
970 if (txq->axq_qnum == ATH_TXQ_SWQ)
971 ath_tx_handoff_mcast(sc, txq, bf);
973 ath_tx_handoff_hw(sc, txq, bf);
977 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
978 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
981 DPRINTF(sc, ATH_DEBUG_XMIT,
982 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
991 const struct ieee80211_cipher *cip;
992 struct ieee80211_key *k;
995 * Construct the 802.11 header+trailer for an encrypted
996 * frame. The only reason this can fail is because of an
997 * unknown or unsupported cipher/key type.
999 k = ieee80211_crypto_encap(ni, m0);
1002 * This can happen when the key is yanked after the
1003 * frame was queued. Just discard the frame; the
1004 * 802.11 layer counts failures and provides
1005 * debugging/diagnostics.
1010 * Adjust the packet + header lengths for the crypto
1011 * additions and calculate the h/w key index. When
1012 * a s/w mic is done the frame will have had any mic
1013 * added to it prior to entry so m0->m_pkthdr.len will
1014 * account for it. Otherwise we need to add it to the
1018 (*hdrlen) += cip->ic_header;
1019 (*pktlen) += cip->ic_header + cip->ic_trailer;
1020 /* NB: frags always have any TKIP MIC done in s/w */
1021 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1022 (*pktlen) += cip->ic_miclen;
1023 (*keyix) = k->wk_keyix;
1024 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1026 * Use station key cache slot, if assigned.
1028 (*keyix) = ni->ni_ucastkey.wk_keyix;
1029 if ((*keyix) == IEEE80211_KEYIX_NONE)
1030 (*keyix) = HAL_TXKEYIX_INVALID;
1032 (*keyix) = HAL_TXKEYIX_INVALID;
1038 * Calculate whether interoperability protection is required for
1041 * This requires the rate control information be filled in,
1042 * as the protection requirement depends upon the current
1043 * operating mode / PHY.
1046 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1048 struct ieee80211_frame *wh;
1052 const HAL_RATE_TABLE *rt = sc->sc_currates;
1053 struct ieee80211com *ic = &sc->sc_ic;
1055 flags = bf->bf_state.bfs_txflags;
1056 rix = bf->bf_state.bfs_rc[0].rix;
1057 shortPreamble = bf->bf_state.bfs_shpream;
1058 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1060 /* Disable frame protection for TOA probe frames */
1061 if (bf->bf_flags & ATH_BUF_TOA_PROBE) {
1063 flags &= ~(HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA);
1064 bf->bf_state.bfs_doprot = 0;
1069 * If 802.11g protection is enabled, determine whether
1070 * to use RTS/CTS or just CTS. Note that this is only
1071 * done for OFDM unicast frames.
1073 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1074 rt->info[rix].phy == IEEE80211_T_OFDM &&
1075 (flags & HAL_TXDESC_NOACK) == 0) {
1076 bf->bf_state.bfs_doprot = 1;
1077 /* XXX fragments must use CCK rates w/ protection */
1078 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1079 flags |= HAL_TXDESC_RTSENA;
1080 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1081 flags |= HAL_TXDESC_CTSENA;
1084 * For frags it would be desirable to use the
1085 * highest CCK rate for RTS/CTS. But stations
1086 * farther away may detect it at a lower CCK rate
1087 * so use the configured protection rate instead
1090 sc->sc_stats.ast_tx_protect++;
1094 * If 11n protection is enabled and it's a HT frame,
1097 * XXX ic_htprotmode or ic_curhtprotmode?
1098 * XXX should it_htprotmode only matter if ic_curhtprotmode
1099 * XXX indicates it's not a HT pure environment?
1101 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1102 rt->info[rix].phy == IEEE80211_T_HT &&
1103 (flags & HAL_TXDESC_NOACK) == 0) {
1104 flags |= HAL_TXDESC_RTSENA;
1105 sc->sc_stats.ast_tx_htprotect++;
1109 bf->bf_state.bfs_txflags = flags;
1113 * Update the frame duration given the currently selected rate.
1115 * This also updates the frame duration value, so it will require
1119 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1121 struct ieee80211_frame *wh;
1125 struct ath_hal *ah = sc->sc_ah;
1126 const HAL_RATE_TABLE *rt = sc->sc_currates;
1127 int isfrag = bf->bf_m->m_flags & M_FRAG;
1129 flags = bf->bf_state.bfs_txflags;
1130 rix = bf->bf_state.bfs_rc[0].rix;
1131 shortPreamble = bf->bf_state.bfs_shpream;
1132 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1135 * Calculate duration. This logically belongs in the 802.11
1136 * layer but it lacks sufficient information to calculate it.
1138 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1139 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1142 dur = rt->info[rix].spAckDuration;
1144 dur = rt->info[rix].lpAckDuration;
1145 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1146 dur += dur; /* additional SIFS+ACK */
1148 * Include the size of next fragment so NAV is
1149 * updated properly. The last fragment uses only
1152 * XXX TODO: ensure that the rate lookup for each
1153 * fragment is the same as the rate used by the
1156 dur += ath_hal_computetxtime(ah,
1164 * Force hardware to use computed duration for next
1165 * fragment by disabling multi-rate retry which updates
1166 * duration based on the multi-rate duration table.
1168 bf->bf_state.bfs_ismrr = 0;
1169 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1170 /* XXX update bfs_rc[0].try? */
1173 /* Update the duration field itself */
1174 *(u_int16_t *)wh->i_dur = htole16(dur);
1179 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1180 int cix, int shortPreamble)
1185 * CTS transmit rate is derived from the transmit rate
1186 * by looking in the h/w rate table. We must also factor
1187 * in whether or not a short preamble is to be used.
1189 /* NB: cix is set above where RTS/CTS is enabled */
1190 KASSERT(cix != 0xff, ("cix not setup"));
1191 ctsrate = rt->info[cix].rateCode;
1193 /* XXX this should only matter for legacy rates */
1195 ctsrate |= rt->info[cix].shortPreamble;
1201 * Calculate the RTS/CTS duration for legacy frames.
1204 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1205 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1208 int ctsduration = 0;
1210 /* This mustn't be called for HT modes */
1211 if (rt->info[cix].phy == IEEE80211_T_HT) {
1212 printf("%s: HT rate where it shouldn't be (0x%x)\n",
1213 __func__, rt->info[cix].rateCode);
1218 * Compute the transmit duration based on the frame
1219 * size and the size of an ACK frame. We call into the
1220 * HAL to do the computation since it depends on the
1221 * characteristics of the actual PHY being used.
1223 * NB: CTS is assumed the same size as an ACK so we can
1224 * use the precalculated ACK durations.
1226 if (shortPreamble) {
1227 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1228 ctsduration += rt->info[cix].spAckDuration;
1229 ctsduration += ath_hal_computetxtime(ah,
1230 rt, pktlen, rix, AH_TRUE, AH_TRUE);
1231 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1232 ctsduration += rt->info[rix].spAckDuration;
1234 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1235 ctsduration += rt->info[cix].lpAckDuration;
1236 ctsduration += ath_hal_computetxtime(ah,
1237 rt, pktlen, rix, AH_FALSE, AH_TRUE);
1238 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1239 ctsduration += rt->info[rix].lpAckDuration;
1242 return (ctsduration);
1246 * Update the given ath_buf with updated rts/cts setup and duration
1249 * To support rate lookups for each software retry, the rts/cts rate
1250 * and cts duration must be re-calculated.
1252 * This function assumes the RTS/CTS flags have been set as needed;
1253 * mrr has been disabled; and the rate control lookup has been done.
1255 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1256 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1259 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1261 uint16_t ctsduration = 0;
1262 uint8_t ctsrate = 0;
1263 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1265 const HAL_RATE_TABLE *rt = sc->sc_currates;
1268 * No RTS/CTS enabled? Don't bother.
1270 if ((bf->bf_state.bfs_txflags &
1271 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1272 /* XXX is this really needed? */
1273 bf->bf_state.bfs_ctsrate = 0;
1274 bf->bf_state.bfs_ctsduration = 0;
1279 * If protection is enabled, use the protection rix control
1280 * rate. Otherwise use the rate0 control rate.
1282 if (bf->bf_state.bfs_doprot)
1283 rix = sc->sc_protrix;
1285 rix = bf->bf_state.bfs_rc[0].rix;
1288 * If the raw path has hard-coded ctsrate0 to something,
1291 if (bf->bf_state.bfs_ctsrate0 != 0)
1292 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1294 /* Control rate from above */
1295 cix = rt->info[rix].controlRate;
1297 /* Calculate the rtscts rate for the given cix */
1298 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1299 bf->bf_state.bfs_shpream);
1301 /* The 11n chipsets do ctsduration calculations for you */
1302 if (! ath_tx_is_11n(sc))
1303 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1304 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1305 rt, bf->bf_state.bfs_txflags);
1307 /* Squirrel away in ath_buf */
1308 bf->bf_state.bfs_ctsrate = ctsrate;
1309 bf->bf_state.bfs_ctsduration = ctsduration;
1312 * Must disable multi-rate retry when using RTS/CTS.
1314 if (!sc->sc_mrrprot) {
1315 bf->bf_state.bfs_ismrr = 0;
1316 bf->bf_state.bfs_try0 =
1317 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1322 * Setup the descriptor chain for a normal or fast-frame
1325 * XXX TODO: extend to include the destination hardware QCU ID.
1326 * Make sure that is correct. Make sure that when being added
1327 * to the mcastq, the CABQ QCUID is set or things will get a bit
1331 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1333 struct ath_desc *ds = bf->bf_desc;
1334 struct ath_hal *ah = sc->sc_ah;
1336 if (bf->bf_state.bfs_txrate0 == 0)
1337 DPRINTF(sc, ATH_DEBUG_XMIT,
1338 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1340 ath_hal_setuptxdesc(ah, ds
1341 , bf->bf_state.bfs_pktlen /* packet length */
1342 , bf->bf_state.bfs_hdrlen /* header length */
1343 , bf->bf_state.bfs_atype /* Atheros packet type */
1344 , bf->bf_state.bfs_txpower /* txpower */
1345 , bf->bf_state.bfs_txrate0
1346 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1347 , bf->bf_state.bfs_keyix /* key cache index */
1348 , bf->bf_state.bfs_txantenna /* antenna mode */
1349 , bf->bf_state.bfs_txflags /* flags */
1350 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1351 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1355 * This will be overriden when the descriptor chain is written.
1360 /* Set rate control and descriptor chain for this frame */
1361 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1362 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1368 * This performs a rate lookup for the given ath_buf only if it's required.
1369 * Non-data frames and raw frames don't require it.
1371 * This populates the primary and MRR entries; MRR values are
1372 * then disabled later on if something requires it (eg RTS/CTS on
1375 * This needs to be done before the RTS/CTS fields are calculated
1376 * as they may depend upon the rate chosen.
1379 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1384 if (! bf->bf_state.bfs_doratelookup)
1387 /* Get rid of any previous state */
1388 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1390 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1391 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1392 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1394 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1395 bf->bf_state.bfs_rc[0].rix = rix;
1396 bf->bf_state.bfs_rc[0].ratecode = rate;
1397 bf->bf_state.bfs_rc[0].tries = try0;
1399 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1400 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1401 bf->bf_state.bfs_rc);
1402 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1404 sc->sc_txrix = rix; /* for LED blinking */
1405 sc->sc_lastdatarix = rix; /* for fast frames */
1406 bf->bf_state.bfs_try0 = try0;
1407 bf->bf_state.bfs_txrate0 = rate;
1411 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1414 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1417 struct ath_node *an = ATH_NODE(bf->bf_node);
1419 ATH_TX_LOCK_ASSERT(sc);
1421 if (an->clrdmask == 1) {
1422 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1428 * Return whether this frame should be software queued or
1429 * direct dispatched.
1431 * When doing powersave, BAR frames should be queued but other management
1432 * frames should be directly sent.
1434 * When not doing powersave, stick BAR frames into the hardware queue
1435 * so it goes out even though the queue is paused.
1437 * For now, management frames are also software queued by default.
1440 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1441 struct mbuf *m0, int *queue_to_head)
1443 struct ieee80211_node *ni = &an->an_node;
1444 struct ieee80211_frame *wh;
1445 uint8_t type, subtype;
1447 wh = mtod(m0, struct ieee80211_frame *);
1448 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1449 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1451 (*queue_to_head) = 0;
1453 /* If it's not in powersave - direct-dispatch BAR */
1454 if ((ATH_NODE(ni)->an_is_powersave == 0)
1455 && type == IEEE80211_FC0_TYPE_CTL &&
1456 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1457 DPRINTF(sc, ATH_DEBUG_SW_TX,
1458 "%s: BAR: TX'ing direct\n", __func__);
1460 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1461 && type == IEEE80211_FC0_TYPE_CTL &&
1462 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1463 /* BAR TX whilst asleep; queue */
1464 DPRINTF(sc, ATH_DEBUG_SW_TX,
1465 "%s: swq: TX'ing\n", __func__);
1466 (*queue_to_head) = 1;
1468 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1469 && (type == IEEE80211_FC0_TYPE_MGT ||
1470 type == IEEE80211_FC0_TYPE_CTL)) {
1472 * Other control/mgmt frame; bypass software queuing
1475 DPRINTF(sc, ATH_DEBUG_XMIT,
1476 "%s: %6D: Node is asleep; sending mgmt "
1477 "(type=%d, subtype=%d)\n",
1478 __func__, ni->ni_macaddr, ":", type, subtype);
1487 * Transmit the given frame to the hardware.
1489 * The frame must already be setup; rate control must already have
1492 * XXX since the TXQ lock is being held here (and I dislike holding
1493 * it for this long when not doing software aggregation), later on
1494 * break this function into "setup_normal" and "xmit_normal". The
1495 * lock only needs to be held for the ath_tx_handoff call.
1497 * XXX we don't update the leak count here - if we're doing
1498 * direct frame dispatch, we need to be able to do it without
1499 * decrementing the leak count (eg multicast queue frames.)
1502 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1505 struct ath_node *an = ATH_NODE(bf->bf_node);
1506 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1508 ATH_TX_LOCK_ASSERT(sc);
1511 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1512 * set a completion handler however it doesn't (yet) properly
1513 * handle the strict ordering requirements needed for normal,
1514 * non-aggregate session frames.
1516 * Once this is implemented, only set CLRDMASK like this for
1517 * frames that must go out - eg management/raw frames.
1519 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1521 /* Setup the descriptor before handoff */
1522 ath_tx_do_ratelookup(sc, bf);
1523 ath_tx_calc_duration(sc, bf);
1524 ath_tx_calc_protection(sc, bf);
1525 ath_tx_set_rtscts(sc, bf);
1526 ath_tx_rate_fill_rcflags(sc, bf);
1527 ath_tx_setds(sc, bf);
1529 /* Track per-TID hardware queue depth correctly */
1532 /* Assign the completion handler */
1533 bf->bf_comp = ath_tx_normal_comp;
1535 /* Hand off to hardware */
1536 ath_tx_handoff(sc, txq, bf);
1540 * Do the basic frame setup stuff that's required before the frame
1541 * is added to a software queue.
1543 * All frames get mostly the same treatment and it's done once.
1544 * Retransmits fiddle with things like the rate control setup,
1545 * setting the retransmit bit in the packet; doing relevant DMA/bus
1546 * syncing and relinking it (back) into the hardware TX queue.
1548 * Note that this may cause the mbuf to be reallocated, so
1549 * m0 may not be valid.
1552 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1553 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1555 struct ieee80211vap *vap = ni->ni_vap;
1556 struct ieee80211com *ic = &sc->sc_ic;
1557 int error, iswep, ismcast, isfrag, ismrr;
1558 int keyix, hdrlen, pktlen, try0 = 0;
1559 u_int8_t rix = 0, txrate = 0;
1560 struct ath_desc *ds;
1561 struct ieee80211_frame *wh;
1562 u_int subtype, flags;
1564 const HAL_RATE_TABLE *rt;
1565 HAL_BOOL shortPreamble;
1566 struct ath_node *an;
1568 /* XXX TODO: this pri is only used for non-QoS check, right? */
1572 * To ensure that both sequence numbers and the CCMP PN handling
1573 * is "correct", make sure that the relevant TID queue is locked.
1574 * Otherwise the CCMP PN and seqno may appear out of order, causing
1575 * re-ordered frames to have out of order CCMP PN's, resulting
1576 * in many, many frame drops.
1578 ATH_TX_LOCK_ASSERT(sc);
1580 wh = mtod(m0, struct ieee80211_frame *);
1581 iswep = wh->i_fc[1] & IEEE80211_FC1_PROTECTED;
1582 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1583 isfrag = m0->m_flags & M_FRAG;
1584 hdrlen = ieee80211_anyhdrsize(wh);
1586 * Packet length must not include any
1587 * pad bytes; deduct them here.
1589 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1591 /* Handle encryption twiddling if needed */
1592 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1594 ieee80211_free_mbuf(m0);
1598 /* packet header may have moved, reset our local pointer */
1599 wh = mtod(m0, struct ieee80211_frame *);
1601 pktlen += IEEE80211_CRC_LEN;
1604 * Load the DMA map so any coalescing is done. This
1605 * also calculates the number of descriptors we need.
1607 error = ath_tx_dmasetup(sc, bf, m0);
1610 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
1611 bf->bf_node = ni; /* NB: held reference */
1612 m0 = bf->bf_m; /* NB: may have changed */
1613 wh = mtod(m0, struct ieee80211_frame *);
1615 /* setup descriptors */
1617 rt = sc->sc_currates;
1618 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1621 * NB: the 802.11 layer marks whether or not we should
1622 * use short preamble based on the current mode and
1623 * negotiated parameters.
1625 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1626 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1627 shortPreamble = AH_TRUE;
1628 sc->sc_stats.ast_tx_shortpre++;
1630 shortPreamble = AH_FALSE;
1634 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1636 ismrr = 0; /* default no multi-rate retry*/
1638 pri = ath_tx_getac(sc, m0); /* honor classification */
1639 /* XXX use txparams instead of fixed values */
1641 * Calculate Atheros packet type from IEEE80211 packet header,
1642 * setup for rate calculations, and select h/w transmit queue.
1644 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1645 case IEEE80211_FC0_TYPE_MGT:
1646 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1647 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1648 atype = HAL_PKT_TYPE_BEACON;
1649 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1650 atype = HAL_PKT_TYPE_PROBE_RESP;
1651 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1652 atype = HAL_PKT_TYPE_ATIM;
1654 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1655 rix = an->an_mgmtrix;
1656 txrate = rt->info[rix].rateCode;
1658 txrate |= rt->info[rix].shortPreamble;
1659 try0 = ATH_TXMGTTRY;
1660 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1662 case IEEE80211_FC0_TYPE_CTL:
1663 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1664 rix = an->an_mgmtrix;
1665 txrate = rt->info[rix].rateCode;
1667 txrate |= rt->info[rix].shortPreamble;
1668 try0 = ATH_TXMGTTRY;
1669 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1671 case IEEE80211_FC0_TYPE_DATA:
1672 atype = HAL_PKT_TYPE_NORMAL; /* default */
1674 * Data frames: multicast frames go out at a fixed rate,
1675 * EAPOL frames use the mgmt frame rate; otherwise consult
1676 * the rate control module for the rate to use.
1679 rix = an->an_mcastrix;
1680 txrate = rt->info[rix].rateCode;
1682 txrate |= rt->info[rix].shortPreamble;
1684 } else if (m0->m_flags & M_EAPOL) {
1685 /* XXX? maybe always use long preamble? */
1686 rix = an->an_mgmtrix;
1687 txrate = rt->info[rix].rateCode;
1689 txrate |= rt->info[rix].shortPreamble;
1690 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1693 * Do rate lookup on each TX, rather than using
1694 * the hard-coded TX information decided here.
1697 bf->bf_state.bfs_doratelookup = 1;
1701 * Check whether to set NOACK for this WME category or not.
1703 if (ieee80211_wme_vap_ac_is_noack(vap, pri))
1704 flags |= HAL_TXDESC_NOACK;
1707 device_printf(sc->sc_dev, "bogus frame type 0x%x (%s)\n",
1708 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1710 /* XXX free tx dmamap */
1711 ieee80211_free_mbuf(m0);
1716 * There are two known scenarios where the frame AC doesn't match
1717 * what the destination TXQ is.
1719 * + non-QoS frames (eg management?) that the net80211 stack has
1720 * assigned a higher AC to, but since it's a non-QoS TID, it's
1721 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1722 * It's quite possible that management frames should just be
1723 * direct dispatched to hardware rather than go via the software
1724 * queue; that should be investigated in the future. There are
1725 * some specific scenarios where this doesn't make sense, mostly
1726 * surrounding ADDBA request/response - hence why that is special
1729 * + Multicast frames going into the VAP mcast queue. That shows up
1732 * This driver should eventually support separate TID and TXQ locking,
1733 * allowing for arbitrary AC frames to appear on arbitrary software
1734 * queues, being queued to the "correct" hardware queue when needed.
1737 if (txq != sc->sc_ac2q[pri]) {
1738 DPRINTF(sc, ATH_DEBUG_XMIT,
1739 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1745 sc->sc_ac2q[pri]->axq_qnum);
1750 * Calculate miscellaneous flags.
1753 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1754 } else if (pktlen > vap->iv_rtsthreshold &&
1755 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1756 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1757 sc->sc_stats.ast_tx_rts++;
1759 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1760 sc->sc_stats.ast_tx_noack++;
1761 #ifdef IEEE80211_SUPPORT_TDMA
1762 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1763 DPRINTF(sc, ATH_DEBUG_TDMA,
1764 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1765 sc->sc_stats.ast_tdma_ack++;
1766 /* XXX free tx dmamap */
1767 ieee80211_free_mbuf(m0);
1773 * If it's a frame to do location reporting on,
1774 * communicate it to the HAL.
1776 if (ieee80211_get_toa_params(m0, NULL)) {
1777 device_printf(sc->sc_dev,
1778 "%s: setting TX positioning bit\n", __func__);
1779 flags |= HAL_TXDESC_POS;
1782 * Note: The hardware reports timestamps for
1783 * each of the RX'ed packets as part of the packet
1784 * exchange. So this means things like RTS/CTS
1785 * exchanges, as well as the final ACK.
1787 * So, if you send a RTS-protected NULL data frame,
1788 * you'll get an RX report for the RTS response, then
1789 * an RX report for the NULL frame, and then the TX
1790 * completion at the end.
1792 * NOTE: it doesn't work right for CCK frames;
1793 * there's no channel info data provided unless
1794 * it's OFDM or HT. Will have to dig into it.
1796 flags &= ~(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
1797 bf->bf_flags |= ATH_BUF_TOA_PROBE;
1802 * Placeholder: if you want to transmit with the azimuth
1803 * timestamp in the end of the payload, here's where you
1804 * should set the TXDESC field.
1806 flags |= HAL_TXDESC_HWTS;
1810 * Determine if a tx interrupt should be generated for
1811 * this descriptor. We take a tx interrupt to reap
1812 * descriptors when the h/w hits an EOL condition or
1813 * when the descriptor is specifically marked to generate
1814 * an interrupt. We periodically mark descriptors in this
1815 * way to insure timely replenishing of the supply needed
1816 * for sending frames. Defering interrupts reduces system
1817 * load and potentially allows more concurrent work to be
1818 * done but if done to aggressively can cause senders to
1821 * NB: use >= to deal with sc_txintrperiod changing
1822 * dynamically through sysctl.
1824 if (flags & HAL_TXDESC_INTREQ) {
1825 txq->axq_intrcnt = 0;
1826 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1827 flags |= HAL_TXDESC_INTREQ;
1828 txq->axq_intrcnt = 0;
1831 /* This point forward is actual TX bits */
1834 * At this point we are committed to sending the frame
1835 * and we don't need to look at m_nextpkt; clear it in
1836 * case this frame is part of frag chain.
1838 m0->m_nextpkt = NULL;
1840 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1841 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1842 sc->sc_hwmap[rix].ieeerate, -1);
1844 if (ieee80211_radiotap_active_vap(vap)) {
1845 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1847 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1849 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1850 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1851 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1852 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1854 ieee80211_radiotap_tx(vap, m0);
1857 /* Blank the legacy rate array */
1858 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1861 * ath_buf_set_rate needs at least one rate/try to setup
1862 * the rate scenario.
1864 bf->bf_state.bfs_rc[0].rix = rix;
1865 bf->bf_state.bfs_rc[0].tries = try0;
1866 bf->bf_state.bfs_rc[0].ratecode = txrate;
1868 /* Store the decided rate index values away */
1869 bf->bf_state.bfs_pktlen = pktlen;
1870 bf->bf_state.bfs_hdrlen = hdrlen;
1871 bf->bf_state.bfs_atype = atype;
1872 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1873 bf->bf_state.bfs_txrate0 = txrate;
1874 bf->bf_state.bfs_try0 = try0;
1875 bf->bf_state.bfs_keyix = keyix;
1876 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1877 bf->bf_state.bfs_txflags = flags;
1878 bf->bf_state.bfs_shpream = shortPreamble;
1880 /* XXX this should be done in ath_tx_setrate() */
1881 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1882 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1883 bf->bf_state.bfs_ctsduration = 0;
1884 bf->bf_state.bfs_ismrr = ismrr;
1890 * Queue a frame to the hardware or software queue.
1892 * This can be called by the net80211 code.
1894 * XXX what about locking? Or, push the seqno assign into the
1895 * XXX aggregate scheduler so its serialised?
1897 * XXX When sending management frames via ath_raw_xmit(),
1898 * should CLRDMASK be set unconditionally?
1901 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1902 struct ath_buf *bf, struct mbuf *m0)
1904 struct ieee80211vap *vap = ni->ni_vap;
1905 struct ath_vap *avp = ATH_VAP(vap);
1909 struct ath_txq *txq;
1911 const struct ieee80211_frame *wh;
1912 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1913 ieee80211_seq seqno;
1914 uint8_t type, subtype;
1917 ATH_TX_LOCK_ASSERT(sc);
1920 * Determine the target hardware queue.
1922 * For multicast frames, the txq gets overridden appropriately
1923 * depending upon the state of PS. If powersave is enabled
1924 * then they get added to the cabq for later transmit.
1926 * The "fun" issue here is that group addressed frames should
1927 * have the sequence number from a different pool, rather than
1928 * the per-TID pool. That means that even QoS group addressed
1929 * frames will have a sequence number from that global value,
1930 * which means if we transmit different group addressed frames
1931 * at different traffic priorities, the sequence numbers will
1932 * all be out of whack. So - chances are, the right thing
1933 * to do here is to always put group addressed frames into the BE
1934 * queue, and ignore the TID for queue selection.
1936 * For any other frame, we do a TID/QoS lookup inside the frame
1937 * to see what the TID should be. If it's a non-QoS frame, the
1938 * AC and TID are overridden. The TID/TXQ code assumes the
1939 * TID is on a predictable hardware TXQ, so we don't support
1940 * having a node TID queued to multiple hardware TXQs.
1941 * This may change in the future but would require some locking
1944 pri = ath_tx_getac(sc, m0);
1945 tid = ath_tx_gettid(sc, m0);
1947 txq = sc->sc_ac2q[pri];
1948 wh = mtod(m0, struct ieee80211_frame *);
1949 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1950 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1951 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1954 * Enforce how deep the multicast queue can grow.
1956 * XXX duplicated in ath_raw_xmit().
1958 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1959 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1960 > sc->sc_txq_mcastq_maxdepth) {
1961 sc->sc_stats.ast_tx_mcastq_overflow++;
1968 * Enforce how deep the unicast queue can grow.
1970 * If the node is in power save then we don't want
1971 * the software queue to grow too deep, or a node may
1972 * end up consuming all of the ath_buf entries.
1974 * For now, only do this for DATA frames.
1976 * We will want to cap how many management/control
1977 * frames get punted to the software queue so it doesn't
1978 * fill up. But the correct solution isn't yet obvious.
1979 * In any case, this check should at least let frames pass
1980 * that we are direct-dispatching.
1982 * XXX TODO: duplicate this to the raw xmit path!
1984 if (type == IEEE80211_FC0_TYPE_DATA &&
1985 ATH_NODE(ni)->an_is_powersave &&
1986 ATH_NODE(ni)->an_swq_depth >
1987 sc->sc_txq_node_psq_maxdepth) {
1988 sc->sc_stats.ast_tx_node_psq_overflow++;
1994 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1995 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1996 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1998 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1999 __func__, tid, pri, is_ampdu);
2001 /* Set local packet state, used to queue packets to hardware */
2002 bf->bf_state.bfs_tid = tid;
2003 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
2004 bf->bf_state.bfs_pri = pri;
2008 * When servicing one or more stations in power-save mode
2009 * (or) if there is some mcast data waiting on the mcast
2010 * queue (to prevent out of order delivery) multicast frames
2011 * must be bufferd until after the beacon.
2013 * TODO: we should lock the mcastq before we check the length.
2015 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
2016 txq = &avp->av_mcastq;
2018 * Mark the frame as eventually belonging on the CAB
2019 * queue, so the descriptor setup functions will
2020 * correctly initialise the descriptor 'qcuId' field.
2022 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
2026 /* Do the generic frame setup */
2027 /* XXX should just bzero the bf_state? */
2028 bf->bf_state.bfs_dobaw = 0;
2030 /* A-MPDU TX? Manually set sequence number */
2032 * Don't do it whilst pending; the net80211 layer still
2035 * Don't assign A-MPDU sequence numbers to group address
2036 * frames; they come from a different sequence number space.
2038 if (is_ampdu_tx && (! IEEE80211_IS_MULTICAST(wh->i_addr1))) {
2040 * Always call; this function will
2041 * handle making sure that null data frames
2042 * and group-addressed frames don't get a sequence number
2043 * from the current TID and thus mess with the BAW.
2045 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
2048 * Don't add QoS NULL frames and group-addressed frames
2051 if (IEEE80211_QOS_HAS_SEQ(wh) &&
2052 (! IEEE80211_IS_MULTICAST(wh->i_addr1)) &&
2053 (subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL)) {
2054 bf->bf_state.bfs_dobaw = 1;
2059 * If needed, the sequence number has been assigned.
2060 * Squirrel it away somewhere easy to get to.
2062 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
2064 /* Is ampdu pending? fetch the seqno and print it out */
2065 if (is_ampdu_pending)
2066 DPRINTF(sc, ATH_DEBUG_SW_TX,
2067 "%s: tid %d: ampdu pending, seqno %d\n",
2068 __func__, tid, M_SEQNO_GET(m0));
2070 /* This also sets up the DMA map; crypto; frame parameters, etc */
2071 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
2076 /* At this point m0 could have changed! */
2081 * If it's a multicast frame, do a direct-dispatch to the
2082 * destination hardware queue. Don't bother software
2086 * If it's a BAR frame, do a direct dispatch to the
2087 * destination hardware queue. Don't bother software
2088 * queuing it, as the TID will now be paused.
2089 * Sending a BAR frame can occur from the net80211 txa timer
2090 * (ie, retries) or from the ath txtask (completion call.)
2091 * It queues directly to hardware because the TID is paused
2092 * at this point (and won't be unpaused until the BAR has
2093 * either been TXed successfully or max retries has been
2097 * Until things are better debugged - if this node is asleep
2098 * and we're sending it a non-BAR frame, direct dispatch it.
2099 * Why? Because we need to figure out what's actually being
2100 * sent - eg, during reassociation/reauthentication after
2101 * the node (last) disappeared whilst asleep, the driver should
2102 * have unpaused/unsleep'ed the node. So until that is
2103 * sorted out, use this workaround.
2105 if (txq == &avp->av_mcastq) {
2106 DPRINTF(sc, ATH_DEBUG_SW_TX,
2107 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2108 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2109 ath_tx_xmit_normal(sc, txq, bf);
2110 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2112 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2114 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2115 ath_tx_xmit_normal(sc, txq, bf);
2119 * For now, since there's no software queue,
2120 * direct-dispatch to the hardware.
2122 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2124 * Update the current leak count if
2125 * we're leaking frames; and set the
2126 * MORE flag as appropriate.
2128 ath_tx_leak_count_update(sc, tid, bf);
2129 ath_tx_xmit_normal(sc, txq, bf);
2136 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2137 struct ath_buf *bf, struct mbuf *m0,
2138 const struct ieee80211_bpf_params *params)
2140 struct ieee80211com *ic = &sc->sc_ic;
2141 struct ieee80211vap *vap = ni->ni_vap;
2142 int error, ismcast, ismrr;
2143 int keyix, hdrlen, pktlen, try0, txantenna;
2144 u_int8_t rix, txrate;
2145 struct ieee80211_frame *wh;
2148 const HAL_RATE_TABLE *rt;
2149 struct ath_desc *ds;
2153 uint8_t type, subtype;
2155 struct ath_node *an = ATH_NODE(ni);
2157 ATH_TX_LOCK_ASSERT(sc);
2159 wh = mtod(m0, struct ieee80211_frame *);
2160 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2161 hdrlen = ieee80211_anyhdrsize(wh);
2163 * Packet length must not include any
2164 * pad bytes; deduct them here.
2166 /* XXX honor IEEE80211_BPF_DATAPAD */
2167 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2169 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2170 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2172 ATH_KTR(sc, ATH_KTR_TX, 2,
2173 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2175 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2178 pri = params->ibp_pri & 3;
2179 /* Override pri if the frame isn't a QoS one */
2180 if (! IEEE80211_QOS_HAS_SEQ(wh))
2181 pri = ath_tx_getac(sc, m0);
2183 /* XXX If it's an ADDBA, override the correct queue */
2184 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2186 /* Map ADDBA to the correct priority */
2189 DPRINTF(sc, ATH_DEBUG_XMIT,
2190 "%s: overriding tid %d pri %d -> %d\n",
2191 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2193 pri = TID_TO_WME_AC(o_tid);
2197 * "pri" is the hardware queue to transmit on.
2199 * Look at the description in ath_tx_start() to understand
2200 * what needs to be "fixed" here so we just use the TID
2204 /* Handle encryption twiddling if needed */
2205 if (! ath_tx_tag_crypto(sc, ni,
2206 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2207 &hdrlen, &pktlen, &keyix)) {
2208 ieee80211_free_mbuf(m0);
2211 /* packet header may have moved, reset our local pointer */
2212 wh = mtod(m0, struct ieee80211_frame *);
2214 /* Do the generic frame setup */
2215 /* XXX should just bzero the bf_state? */
2216 bf->bf_state.bfs_dobaw = 0;
2218 error = ath_tx_dmasetup(sc, bf, m0);
2221 m0 = bf->bf_m; /* NB: may have changed */
2222 wh = mtod(m0, struct ieee80211_frame *);
2223 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
2224 bf->bf_node = ni; /* NB: held reference */
2226 /* Always enable CLRDMASK for raw frames for now.. */
2227 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2228 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2229 if (params->ibp_flags & IEEE80211_BPF_RTS)
2230 flags |= HAL_TXDESC_RTSENA;
2231 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2232 /* XXX assume 11g/11n protection? */
2233 bf->bf_state.bfs_doprot = 1;
2234 flags |= HAL_TXDESC_CTSENA;
2236 /* XXX leave ismcast to injector? */
2237 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2238 flags |= HAL_TXDESC_NOACK;
2240 rt = sc->sc_currates;
2241 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2243 /* Fetch first rate information */
2244 rix = ath_tx_findrix(sc, params->ibp_rate0);
2245 try0 = params->ibp_try0;
2248 * Override EAPOL rate as appropriate.
2250 if (m0->m_flags & M_EAPOL) {
2251 /* XXX? maybe always use long preamble? */
2252 rix = an->an_mgmtrix;
2253 try0 = ATH_TXMAXTRY; /* XXX?too many? */
2257 * If it's a frame to do location reporting on,
2258 * communicate it to the HAL.
2260 if (ieee80211_get_toa_params(m0, NULL)) {
2261 device_printf(sc->sc_dev,
2262 "%s: setting TX positioning bit\n", __func__);
2263 flags |= HAL_TXDESC_POS;
2264 flags &= ~(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
2265 bf->bf_flags |= ATH_BUF_TOA_PROBE;
2268 txrate = rt->info[rix].rateCode;
2269 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2270 txrate |= rt->info[rix].shortPreamble;
2272 ismrr = (params->ibp_try1 != 0);
2273 txantenna = params->ibp_pri >> 2;
2274 if (txantenna == 0) /* XXX? */
2275 txantenna = sc->sc_txantenna;
2278 * Since ctsrate is fixed, store it away for later
2279 * use when the descriptor fields are being set.
2281 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2282 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2285 * NB: we mark all packets as type PSPOLL so the h/w won't
2286 * set the sequence number, duration, etc.
2288 atype = HAL_PKT_TYPE_PSPOLL;
2290 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2291 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2292 sc->sc_hwmap[rix].ieeerate, -1);
2294 if (ieee80211_radiotap_active_vap(vap)) {
2295 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2296 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)
2297 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2298 if (m0->m_flags & M_FRAG)
2299 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2300 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2301 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2302 ieee80211_get_node_txpower(ni));
2303 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2305 ieee80211_radiotap_tx(vap, m0);
2309 * Formulate first tx descriptor with tx controls.
2312 /* XXX check return value? */
2314 /* Store the decided rate index values away */
2315 bf->bf_state.bfs_pktlen = pktlen;
2316 bf->bf_state.bfs_hdrlen = hdrlen;
2317 bf->bf_state.bfs_atype = atype;
2318 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2319 ieee80211_get_node_txpower(ni));
2320 bf->bf_state.bfs_txrate0 = txrate;
2321 bf->bf_state.bfs_try0 = try0;
2322 bf->bf_state.bfs_keyix = keyix;
2323 bf->bf_state.bfs_txantenna = txantenna;
2324 bf->bf_state.bfs_txflags = flags;
2325 bf->bf_state.bfs_shpream =
2326 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2328 /* Set local packet state, used to queue packets to hardware */
2329 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2330 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2331 bf->bf_state.bfs_pri = pri;
2333 /* XXX this should be done in ath_tx_setrate() */
2334 bf->bf_state.bfs_ctsrate = 0;
2335 bf->bf_state.bfs_ctsduration = 0;
2336 bf->bf_state.bfs_ismrr = ismrr;
2338 /* Blank the legacy rate array */
2339 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2341 bf->bf_state.bfs_rc[0].rix = rix;
2342 bf->bf_state.bfs_rc[0].tries = try0;
2343 bf->bf_state.bfs_rc[0].ratecode = txrate;
2348 rix = ath_tx_findrix(sc, params->ibp_rate1);
2349 bf->bf_state.bfs_rc[1].rix = rix;
2350 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2352 rix = ath_tx_findrix(sc, params->ibp_rate2);
2353 bf->bf_state.bfs_rc[2].rix = rix;
2354 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2356 rix = ath_tx_findrix(sc, params->ibp_rate3);
2357 bf->bf_state.bfs_rc[3].rix = rix;
2358 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2361 * All the required rate control decisions have been made;
2362 * fill in the rc flags.
2364 ath_tx_rate_fill_rcflags(sc, bf);
2366 /* NB: no buffered multicast in power save support */
2369 * If we're overiding the ADDBA destination, dump directly
2370 * into the hardware queue, right after any pending
2371 * frames to that node are.
2373 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2374 __func__, do_override);
2378 * Put addba frames in the right place in the right TID/HWQ.
2381 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2383 * XXX if it's addba frames, should we be leaking
2384 * them out via the frame leak method?
2385 * XXX for now let's not risk it; but we may wish
2386 * to investigate this later.
2388 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2389 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2391 /* Queue to software queue */
2392 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2394 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2395 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2398 /* Direct-dispatch to the hardware */
2399 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2401 * Update the current leak count if
2402 * we're leaking frames; and set the
2403 * MORE flag as appropriate.
2405 ath_tx_leak_count_update(sc, tid, bf);
2406 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2414 * This can be called by net80211.
2417 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2418 const struct ieee80211_bpf_params *params)
2420 struct ieee80211com *ic = ni->ni_ic;
2421 struct ath_softc *sc = ic->ic_softc;
2423 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2427 if (sc->sc_inreset_cnt > 0) {
2428 DPRINTF(sc, ATH_DEBUG_XMIT,
2429 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2434 sc->sc_txstart_cnt++;
2437 /* Wake the hardware up already */
2439 ath_power_set_power_state(sc, HAL_PM_AWAKE);
2444 if (!sc->sc_running || sc->sc_invalid) {
2445 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, r/i: %d/%d",
2446 __func__, sc->sc_running, sc->sc_invalid);
2453 * Enforce how deep the multicast queue can grow.
2455 * XXX duplicated in ath_tx_start().
2457 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2458 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2459 > sc->sc_txq_mcastq_maxdepth) {
2460 sc->sc_stats.ast_tx_mcastq_overflow++;
2471 * Grab a TX buffer and associated resources.
2473 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2475 sc->sc_stats.ast_tx_nobuf++;
2480 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2483 if (params == NULL) {
2485 * Legacy path; interpret frame contents to decide
2486 * precisely how to send the frame.
2488 if (ath_tx_start(sc, ni, bf, m)) {
2489 error = EIO; /* XXX */
2494 * Caller supplied explicit parameters to use in
2495 * sending the frame.
2497 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2498 error = EIO; /* XXX */
2502 sc->sc_wd_timer = 5;
2503 sc->sc_stats.ast_tx_raw++;
2506 * Update the TIM - if there's anything queued to the
2507 * software queue and power save is enabled, we should
2510 ath_tx_update_tim(sc, ni, 1);
2515 sc->sc_txstart_cnt--;
2519 /* Put the hardware back to sleep if required */
2521 ath_power_restore_power_state(sc);
2527 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2533 ath_returnbuf_head(sc, bf);
2534 ATH_TXBUF_UNLOCK(sc);
2540 sc->sc_txstart_cnt--;
2543 /* Put the hardware back to sleep if required */
2545 ath_power_restore_power_state(sc);
2549 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2551 sc->sc_stats.ast_tx_raw_fail++;
2556 /* Some helper functions */
2559 * ADDBA (and potentially others) need to be placed in the same
2560 * hardware queue as the TID/node it's relating to. This is so
2561 * it goes out after any pending non-aggregate frames to the
2564 * If this isn't done, the ADDBA can go out before the frames
2565 * queued in hardware. Even though these frames have a sequence
2566 * number -earlier- than the ADDBA can be transmitted (but
2567 * no frames whose sequence numbers are after the ADDBA should
2568 * be!) they'll arrive after the ADDBA - and the receiving end
2569 * will simply drop them as being out of the BAW.
2571 * The frames can't be appended to the TID software queue - it'll
2572 * never be sent out. So these frames have to be directly
2573 * dispatched to the hardware, rather than queued in software.
2574 * So if this function returns true, the TXQ has to be
2575 * overridden and it has to be directly dispatched.
2577 * It's a dirty hack, but someone's gotta do it.
2581 * XXX doesn't belong here!
2584 ieee80211_is_action(struct ieee80211_frame *wh)
2586 /* Type: Management frame? */
2587 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2588 IEEE80211_FC0_TYPE_MGT)
2591 /* Subtype: Action frame? */
2592 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2593 IEEE80211_FC0_SUBTYPE_ACTION)
2599 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2601 * Return an alternate TID for ADDBA request frames.
2603 * Yes, this likely should be done in the net80211 layer.
2606 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2607 struct ieee80211_node *ni,
2608 struct mbuf *m0, int *tid)
2610 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2611 struct ieee80211_action_ba_addbarequest *ia;
2613 uint16_t baparamset;
2615 /* Not action frame? Bail */
2616 if (! ieee80211_is_action(wh))
2619 /* XXX Not needed for frames we send? */
2621 /* Correct length? */
2622 if (! ieee80211_parse_action(ni, m))
2626 /* Extract out action frame */
2627 frm = (u_int8_t *)&wh[1];
2628 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2630 /* Not ADDBA? Bail */
2631 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2633 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2636 /* Extract TID, return it */
2637 baparamset = le16toh(ia->rq_baparamset);
2638 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2644 /* Per-node software queue operations */
2647 * Add the current packet to the given BAW.
2648 * It is assumed that the current packet
2650 * + fits inside the BAW;
2651 * + already has had a sequence number allocated.
2653 * Since the BAW status may be modified by both the ath task and
2654 * the net80211/ifnet contexts, the TID must be locked.
2657 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2658 struct ath_tid *tid, struct ath_buf *bf)
2661 struct ieee80211_tx_ampdu *tap;
2663 ATH_TX_LOCK_ASSERT(sc);
2665 if (bf->bf_state.bfs_isretried)
2668 tap = ath_tx_get_tx_tid(an, tid->tid);
2670 if (! bf->bf_state.bfs_dobaw) {
2671 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2672 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2673 __func__, SEQNO(bf->bf_state.bfs_seqno),
2674 tap->txa_start, tap->txa_wnd);
2677 if (bf->bf_state.bfs_addedbaw)
2678 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2679 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2680 "baw head=%d tail=%d\n",
2681 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2682 tap->txa_start, tap->txa_wnd, tid->baw_head,
2686 * Verify that the given sequence number is not outside of the
2687 * BAW. Complain loudly if that's the case.
2689 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2690 SEQNO(bf->bf_state.bfs_seqno))) {
2691 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2692 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2693 "baw head=%d tail=%d\n",
2694 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2695 tap->txa_start, tap->txa_wnd, tid->baw_head,
2700 * ni->ni_txseqs[] is the currently allocated seqno.
2701 * the txa state contains the current baw start.
2703 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2704 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2705 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2706 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2707 "baw head=%d tail=%d\n",
2708 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2709 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2714 assert(tid->tx_buf[cindex] == NULL);
2716 if (tid->tx_buf[cindex] != NULL) {
2717 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2718 "%s: ba packet dup (index=%d, cindex=%d, "
2719 "head=%d, tail=%d)\n",
2720 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2721 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2722 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2724 tid->tx_buf[cindex],
2725 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2727 SEQNO(bf->bf_state.bfs_seqno)
2730 tid->tx_buf[cindex] = bf;
2732 if (index >= ((tid->baw_tail - tid->baw_head) &
2733 (ATH_TID_MAX_BUFS - 1))) {
2734 tid->baw_tail = cindex;
2735 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2740 * Flip the BAW buffer entry over from the existing one to the new one.
2742 * When software retransmitting a (sub-)frame, it is entirely possible that
2743 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2744 * In that instance the buffer is cloned and the new buffer is used for
2745 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2746 * tracking array to maintain consistency.
2749 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2750 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2753 struct ieee80211_tx_ampdu *tap;
2754 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2756 ATH_TX_LOCK_ASSERT(sc);
2758 tap = ath_tx_get_tx_tid(an, tid->tid);
2759 index = ATH_BA_INDEX(tap->txa_start, seqno);
2760 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2763 * Just warn for now; if it happens then we should find out
2764 * about it. It's highly likely the aggregation session will
2767 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2768 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2769 "%s: retransmitted buffer"
2770 " has mismatching seqno's, BA session may hang.\n",
2772 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2773 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2774 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2777 if (tid->tx_buf[cindex] != old_bf) {
2778 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2779 "%s: ath_buf pointer incorrect; "
2780 " has m BA session may hang.\n", __func__);
2781 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2782 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2785 tid->tx_buf[cindex] = new_bf;
2789 * seq_start - left edge of BAW
2790 * seq_next - current/next sequence number to allocate
2792 * Since the BAW status may be modified by both the ath task and
2793 * the net80211/ifnet contexts, the TID must be locked.
2796 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2797 struct ath_tid *tid, const struct ath_buf *bf)
2800 struct ieee80211_tx_ampdu *tap;
2801 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2803 ATH_TX_LOCK_ASSERT(sc);
2805 tap = ath_tx_get_tx_tid(an, tid->tid);
2806 index = ATH_BA_INDEX(tap->txa_start, seqno);
2807 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2809 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2810 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2811 "baw head=%d, tail=%d\n",
2812 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2813 cindex, tid->baw_head, tid->baw_tail);
2816 * If this occurs then we have a big problem - something else
2817 * has slid tap->txa_start along without updating the BAW
2818 * tracking start/end pointers. Thus the TX BAW state is now
2819 * completely busted.
2821 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2822 * it's quite possible that a cloned buffer is making its way
2823 * here and causing it to fire off. Disable TDMA for now.
2825 if (tid->tx_buf[cindex] != bf) {
2826 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2827 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2828 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2829 tid->tx_buf[cindex],
2830 (tid->tx_buf[cindex] != NULL) ?
2831 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2834 tid->tx_buf[cindex] = NULL;
2836 while (tid->baw_head != tid->baw_tail &&
2837 !tid->tx_buf[tid->baw_head]) {
2838 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2839 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2841 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2842 "%s: tid=%d: baw is now %d:%d, baw head=%d\n",
2843 __func__, tid->tid, tap->txa_start, tap->txa_wnd, tid->baw_head);
2847 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2850 struct ieee80211_frame *wh;
2852 ATH_TX_LOCK_ASSERT(sc);
2854 if (tid->an->an_leak_count > 0) {
2855 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2858 * Update MORE based on the software/net80211 queue states.
2860 if ((tid->an->an_stack_psq > 0)
2861 || (tid->an->an_swq_depth > 0))
2862 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2864 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2866 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2867 "%s: %6D: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2869 tid->an->an_node.ni_macaddr,
2871 tid->an->an_leak_count,
2872 tid->an->an_stack_psq,
2873 tid->an->an_swq_depth,
2874 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2877 * Re-sync the underlying buffer.
2879 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2880 BUS_DMASYNC_PREWRITE);
2882 tid->an->an_leak_count --;
2887 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2890 ATH_TX_LOCK_ASSERT(sc);
2892 if (tid->an->an_leak_count > 0) {
2901 * Mark the current node/TID as ready to TX.
2903 * This is done to make it easy for the software scheduler to
2904 * find which nodes have data to send.
2906 * The TXQ lock must be held.
2909 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2911 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2913 ATH_TX_LOCK_ASSERT(sc);
2916 * If we are leaking out a frame to this destination
2917 * for PS-POLL, ensure that we allow scheduling to
2920 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2921 return; /* paused, can't schedule yet */
2924 return; /* already scheduled */
2930 * If this is a sleeping node we're leaking to, given
2931 * it a higher priority. This is so bad for QoS it hurts.
2933 if (tid->an->an_leak_count) {
2934 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2936 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2941 * We can't do the above - it'll confuse the TXQ software
2942 * scheduler which will keep checking the _head_ TID
2943 * in the list to see if it has traffic. If we queue
2944 * a TID to the head of the list and it doesn't transmit,
2945 * we'll check it again.
2947 * So, get the rest of this leaking frames support working
2948 * and reliable first and _then_ optimise it so they're
2949 * pushed out in front of any other pending software
2952 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2956 * Mark the current node as no longer needing to be polled for
2959 * The TXQ lock must be held.
2962 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2964 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2966 ATH_TX_LOCK_ASSERT(sc);
2968 if (tid->sched == 0)
2972 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2976 * Assign a sequence number manually to the given frame.
2978 * This should only be called for A-MPDU TX frames.
2980 * Note: for group addressed frames, the sequence number
2981 * should be from NONQOS_TID, and net80211 should have
2982 * already assigned it for us.
2984 static ieee80211_seq
2985 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2986 struct ath_buf *bf, struct mbuf *m0)
2988 struct ieee80211_frame *wh;
2990 ieee80211_seq seqno;
2993 wh = mtod(m0, struct ieee80211_frame *);
2994 tid = ieee80211_gettid(wh);
2996 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, qos has seq=%d\n",
2997 __func__, tid, IEEE80211_QOS_HAS_SEQ(wh));
2999 /* XXX Is it a control frame? Ignore */
3001 /* Does the packet require a sequence number? */
3002 if (! IEEE80211_QOS_HAS_SEQ(wh))
3005 ATH_TX_LOCK_ASSERT(sc);
3008 * Is it a QOS NULL Data frame? Give it a sequence number from
3009 * the default TID (IEEE80211_NONQOS_TID.)
3011 * The RX path of everything I've looked at doesn't include the NULL
3012 * data frame sequence number in the aggregation state updates, so
3013 * assigning it a sequence number there will cause a BAW hole on the
3016 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
3017 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
3018 /* XXX no locking for this TID? This is a bit of a problem. */
3019 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
3020 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
3021 } else if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
3023 * group addressed frames get a sequence number from
3024 * a different sequence number space.
3026 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
3027 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
3029 /* Manually assign sequence number */
3030 seqno = ni->ni_txseqs[tid];
3031 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
3033 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
3034 M_SEQNO_SET(m0, seqno);
3036 /* Return so caller can do something with it if needed */
3037 DPRINTF(sc, ATH_DEBUG_SW_TX,
3038 "%s: -> subtype=0x%x, tid=%d, seqno=%d\n",
3039 __func__, subtype, tid, seqno);
3044 * Attempt to direct dispatch an aggregate frame to hardware.
3045 * If the frame is out of BAW, queue.
3046 * Otherwise, schedule it as a single frame.
3049 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
3050 struct ath_txq *txq, struct ath_buf *bf)
3052 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
3053 struct ieee80211_tx_ampdu *tap;
3055 ATH_TX_LOCK_ASSERT(sc);
3057 tap = ath_tx_get_tx_tid(an, tid->tid);
3060 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
3061 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3062 /* XXX don't sched - we're paused! */
3066 /* outside baw? queue */
3067 if (bf->bf_state.bfs_dobaw &&
3068 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
3069 SEQNO(bf->bf_state.bfs_seqno)))) {
3070 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3071 ath_tx_tid_sched(sc, tid);
3076 * This is a temporary check and should be removed once
3077 * all the relevant code paths have been fixed.
3079 * During aggregate retries, it's possible that the head
3080 * frame will fail (which has the bfs_aggr and bfs_nframes
3081 * fields set for said aggregate) and will be retried as
3082 * a single frame. In this instance, the values should
3083 * be reset or the completion code will get upset with you.
3085 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
3086 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
3087 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
3088 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
3089 bf->bf_state.bfs_aggr = 0;
3090 bf->bf_state.bfs_nframes = 1;
3093 /* Update CLRDMASK just before this frame is queued */
3094 ath_tx_update_clrdmask(sc, tid, bf);
3096 /* Direct dispatch to hardware */
3097 ath_tx_do_ratelookup(sc, bf);
3098 ath_tx_calc_duration(sc, bf);
3099 ath_tx_calc_protection(sc, bf);
3100 ath_tx_set_rtscts(sc, bf);
3101 ath_tx_rate_fill_rcflags(sc, bf);
3102 ath_tx_setds(sc, bf);
3105 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
3107 /* Track per-TID hardware queue depth correctly */
3111 if (bf->bf_state.bfs_dobaw) {
3112 ath_tx_addto_baw(sc, an, tid, bf);
3113 bf->bf_state.bfs_addedbaw = 1;
3116 /* Set completion handler, multi-frame aggregate or not */
3117 bf->bf_comp = ath_tx_aggr_comp;
3120 * Update the current leak count if
3121 * we're leaking frames; and set the
3122 * MORE flag as appropriate.
3124 ath_tx_leak_count_update(sc, tid, bf);
3126 /* Hand off to hardware */
3127 ath_tx_handoff(sc, txq, bf);
3131 * Attempt to send the packet.
3132 * If the queue isn't busy, direct-dispatch.
3133 * If the queue is busy enough, queue the given packet on the
3134 * relevant software queue.
3137 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3138 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3140 struct ath_node *an = ATH_NODE(ni);
3141 struct ieee80211_frame *wh;
3142 struct ath_tid *atid;
3144 struct mbuf *m0 = bf->bf_m;
3146 ATH_TX_LOCK_ASSERT(sc);
3148 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3149 wh = mtod(m0, struct ieee80211_frame *);
3150 pri = ath_tx_getac(sc, m0);
3151 tid = ath_tx_gettid(sc, m0);
3152 atid = &an->an_tid[tid];
3154 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3155 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3157 /* Set local packet state, used to queue packets to hardware */
3158 /* XXX potentially duplicate info, re-check */
3159 bf->bf_state.bfs_tid = tid;
3160 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3161 bf->bf_state.bfs_pri = pri;
3164 * If the hardware queue isn't busy, queue it directly.
3165 * If the hardware queue is busy, queue it.
3166 * If the TID is paused or the traffic it outside BAW, software
3169 * If the node is in power-save and we're leaking a frame,
3170 * leak a single frame.
3172 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3173 /* TID is paused, queue */
3174 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3176 * If the caller requested that it be sent at a high
3177 * priority, queue it at the head of the list.
3180 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3182 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3183 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3184 /* AMPDU pending; queue */
3185 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3186 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3188 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3190 * AMPDU running, queue single-frame if the hardware queue
3193 * If the hardware queue is busy, sending an aggregate frame
3194 * then just hold off so we can queue more aggregate frames.
3196 * Otherwise we may end up with single frames leaking through
3197 * because we are dispatching them too quickly.
3199 * TODO: maybe we should treat this as two policies - minimise
3200 * latency, or maximise throughput. Then for BE/BK we can
3201 * maximise throughput, and VO/VI (if AMPDU is enabled!)
3206 * Always queue the frame to the tail of the list.
3208 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3211 * If the hardware queue isn't busy, direct dispatch
3212 * the head frame in the list.
3214 * Note: if we're say, configured to do ADDBA but not A-MPDU
3215 * then maybe we want to still queue two non-aggregate frames
3216 * to the hardware. Again with the per-TID policy
3219 * Otherwise, schedule the TID.
3221 /* XXX TXQ locking */
3222 if (txq->axq_depth + txq->fifo.axq_depth == 0) {
3224 bf = ATH_TID_FIRST(atid);
3225 ATH_TID_REMOVE(atid, bf, bf_list);
3228 * Ensure it's definitely treated as a non-AMPDU
3229 * frame - this information may have been left
3230 * over from a previous attempt.
3232 bf->bf_state.bfs_aggr = 0;
3233 bf->bf_state.bfs_nframes = 1;
3235 /* Queue to the hardware */
3236 ath_tx_xmit_aggr(sc, an, txq, bf);
3237 DPRINTF(sc, ATH_DEBUG_SW_TX,
3241 DPRINTF(sc, ATH_DEBUG_SW_TX,
3242 "%s: ampdu; swq'ing\n",
3245 ath_tx_tid_sched(sc, atid);
3248 * If we're not doing A-MPDU, be prepared to direct dispatch
3249 * up to both limits if possible. This particular corner
3250 * case may end up with packet starvation between aggregate
3251 * traffic and non-aggregate traffic: we want to ensure
3252 * that non-aggregate stations get a few frames queued to the
3253 * hardware before the aggregate station(s) get their chance.
3255 * So if you only ever see a couple of frames direct dispatched
3256 * to the hardware from a non-AMPDU client, check both here
3257 * and in the software queue dispatcher to ensure that those
3258 * non-AMPDU stations get a fair chance to transmit.
3260 /* XXX TXQ locking */
3261 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3262 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3263 /* AMPDU not running, attempt direct dispatch */
3264 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3265 /* See if clrdmask needs to be set */
3266 ath_tx_update_clrdmask(sc, atid, bf);
3269 * Update the current leak count if
3270 * we're leaking frames; and set the
3271 * MORE flag as appropriate.
3273 ath_tx_leak_count_update(sc, atid, bf);
3276 * Dispatch the frame.
3278 ath_tx_xmit_normal(sc, txq, bf);
3281 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3282 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3283 ath_tx_tid_sched(sc, atid);
3288 * Only set the clrdmask bit if none of the nodes are currently
3291 * XXX TODO: go through all the callers and check to see
3292 * which are being called in the context of looping over all
3293 * TIDs (eg, if all tids are being paused, resumed, etc.)
3294 * That'll avoid O(n^2) complexity here.
3297 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3301 ATH_TX_LOCK_ASSERT(sc);
3303 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3304 if (an->an_tid[i].isfiltered == 1)
3311 * Configure the per-TID node state.
3313 * This likely belongs in if_ath_node.c but I can't think of anywhere
3314 * else to put it just yet.
3316 * This sets up the SLISTs and the mutex as appropriate.
3319 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3322 struct ath_tid *atid;
3324 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3325 atid = &an->an_tid[i];
3327 /* XXX now with this bzer(), is the field 0'ing needed? */
3328 bzero(atid, sizeof(*atid));
3330 TAILQ_INIT(&atid->tid_q);
3331 TAILQ_INIT(&atid->filtq.tid_q);
3334 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3335 atid->tx_buf[j] = NULL;
3336 atid->baw_head = atid->baw_tail = 0;
3339 atid->hwq_depth = 0;
3340 atid->cleanup_inprogress = 0;
3341 if (i == IEEE80211_NONQOS_TID)
3342 atid->ac = ATH_NONQOS_TID_AC;
3344 atid->ac = TID_TO_WME_AC(i);
3346 an->clrdmask = 1; /* Always start by setting this bit */
3350 * Pause the current TID. This stops packets from being transmitted
3353 * Since this is also called from upper layers as well as the driver,
3354 * it will get the TID lock.
3357 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3360 ATH_TX_LOCK_ASSERT(sc);
3362 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: [%6D]: tid=%d, paused = %d\n",
3364 tid->an->an_node.ni_macaddr, ":",
3370 * Unpause the current TID, and schedule it if needed.
3373 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3375 ATH_TX_LOCK_ASSERT(sc);
3378 * There's some odd places where ath_tx_tid_resume() is called
3379 * when it shouldn't be; this works around that particular issue
3380 * until it's actually resolved.
3382 if (tid->paused == 0) {
3383 device_printf(sc->sc_dev,
3384 "%s: [%6D]: tid=%d, paused=0?\n",
3386 tid->an->an_node.ni_macaddr, ":",
3392 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3393 "%s: [%6D]: tid=%d, unpaused = %d\n",
3395 tid->an->an_node.ni_macaddr, ":",
3403 * Override the clrdmask configuration for the next frame
3404 * from this TID, just to get the ball rolling.
3406 ath_tx_set_clrdmask(sc, tid->an);
3408 if (tid->axq_depth == 0)
3411 /* XXX isfiltered shouldn't ever be 0 at this point */
3412 if (tid->isfiltered == 1) {
3413 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3418 ath_tx_tid_sched(sc, tid);
3421 * Queue the software TX scheduler.
3423 ath_tx_swq_kick(sc);
3427 * Add the given ath_buf to the TID filtered frame list.
3428 * This requires the TID be filtered.
3431 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3435 ATH_TX_LOCK_ASSERT(sc);
3437 if (!tid->isfiltered)
3438 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3441 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3443 /* Set the retry bit and bump the retry counter */
3444 ath_tx_set_retry(sc, bf);
3445 sc->sc_stats.ast_tx_swfiltered++;
3447 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3451 * Handle a completed filtered frame from the given TID.
3452 * This just enables/pauses the filtered frame state if required
3453 * and appends the filtered frame to the filtered queue.
3456 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3460 ATH_TX_LOCK_ASSERT(sc);
3462 if (! tid->isfiltered) {
3463 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d; filter transition\n",
3464 __func__, tid->tid);
3465 tid->isfiltered = 1;
3466 ath_tx_tid_pause(sc, tid);
3469 /* Add the frame to the filter queue */
3470 ath_tx_tid_filt_addbuf(sc, tid, bf);
3474 * Complete the filtered frame TX completion.
3476 * If there are no more frames in the hardware queue, unpause/unfilter
3477 * the TID if applicable. Otherwise we will wait for a node PS transition
3481 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3486 ATH_TX_LOCK_ASSERT(sc);
3488 if (tid->hwq_depth != 0)
3491 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d, hwq=0, transition back\n",
3492 __func__, tid->tid);
3493 if (tid->isfiltered == 1) {
3494 tid->isfiltered = 0;
3498 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3499 ath_tx_set_clrdmask(sc, tid->an);
3501 /* XXX this is really quite inefficient */
3502 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3503 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3504 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3507 /* And only resume if we had paused before */
3509 ath_tx_tid_resume(sc, tid);
3513 * Called when a single (aggregate or otherwise) frame is completed.
3515 * Returns 0 if the buffer could be added to the filtered list
3516 * (cloned or otherwise), 1 if the buffer couldn't be added to the
3517 * filtered list (failed clone; expired retry) and the caller should
3518 * free it and handle it like a failure (eg by sending a BAR.)
3520 * since the buffer may be cloned, bf must be not touched after this
3521 * if the return value is 0.
3524 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3527 struct ath_buf *nbf;
3530 ATH_TX_LOCK_ASSERT(sc);
3533 * Don't allow a filtered frame to live forever.
3535 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3536 sc->sc_stats.ast_tx_swretrymax++;
3537 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3538 "%s: bf=%p, seqno=%d, exceeded retries\n",
3541 SEQNO(bf->bf_state.bfs_seqno));
3542 retval = 1; /* error */
3547 * A busy buffer can't be added to the retry list.
3548 * It needs to be cloned.
3550 if (bf->bf_flags & ATH_BUF_BUSY) {
3551 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3552 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3553 "%s: busy buffer clone: %p -> %p\n",
3560 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3561 "%s: busy buffer couldn't be cloned (%p)!\n",
3563 retval = 1; /* error */
3565 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3566 retval = 0; /* ok */
3569 ath_tx_tid_filt_comp_complete(sc, tid);
3575 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3576 struct ath_buf *bf_first, ath_bufhead *bf_q)
3578 struct ath_buf *bf, *bf_next, *nbf;
3580 ATH_TX_LOCK_ASSERT(sc);
3584 bf_next = bf->bf_next;
3585 bf->bf_next = NULL; /* Remove it from the aggr list */
3588 * Don't allow a filtered frame to live forever.
3590 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3591 sc->sc_stats.ast_tx_swretrymax++;
3592 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3593 "%s: tid=%d, bf=%p, seqno=%d, exceeded retries\n",
3597 SEQNO(bf->bf_state.bfs_seqno));
3598 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3602 if (bf->bf_flags & ATH_BUF_BUSY) {
3603 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3604 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3605 "%s: tid=%d, busy buffer cloned: %p -> %p, seqno=%d\n",
3606 __func__, tid->tid, bf, nbf, SEQNO(bf->bf_state.bfs_seqno));
3612 * If the buffer couldn't be cloned, add it to bf_q;
3613 * the caller will free the buffer(s) as required.
3616 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3617 "%s: tid=%d, buffer couldn't be cloned! (%p) seqno=%d\n",
3618 __func__, tid->tid, bf, SEQNO(bf->bf_state.bfs_seqno));
3619 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3621 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3627 ath_tx_tid_filt_comp_complete(sc, tid);
3631 * Suspend the queue because we need to TX a BAR.
3634 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3637 ATH_TX_LOCK_ASSERT(sc);
3639 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3640 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3646 /* We shouldn't be called when bar_tx is 1 */
3648 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3649 "%s: bar_tx is 1?!\n", __func__);
3652 /* If we've already been called, just be patient. */
3659 /* Only one pause, no matter how many frames fail */
3660 ath_tx_tid_pause(sc, tid);
3664 * We've finished with BAR handling - either we succeeded or
3665 * failed. Either way, unsuspend TX.
3668 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3671 ATH_TX_LOCK_ASSERT(sc);
3673 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3674 "%s: %6D: TID=%d, called\n",
3676 tid->an->an_node.ni_macaddr,
3680 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3681 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3682 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3683 __func__, tid->an->an_node.ni_macaddr, ":",
3684 tid->tid, tid->bar_tx, tid->bar_wait);
3687 tid->bar_tx = tid->bar_wait = 0;
3688 ath_tx_tid_resume(sc, tid);
3692 * Return whether we're ready to TX a BAR frame.
3694 * Requires the TID lock be held.
3697 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3700 ATH_TX_LOCK_ASSERT(sc);
3702 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3705 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3706 "%s: %6D: TID=%d, bar ready\n",
3708 tid->an->an_node.ni_macaddr,
3716 * Check whether the current TID is ready to have a BAR
3717 * TXed and if so, do the TX.
3719 * Since the TID/TXQ lock can't be held during a call to
3720 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3721 * sending the BAR and locking it again.
3723 * Eventually, the code to send the BAR should be broken out
3724 * from this routine so the lock doesn't have to be reacquired
3725 * just to be immediately dropped by the caller.
3728 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3730 struct ieee80211_tx_ampdu *tap;
3732 ATH_TX_LOCK_ASSERT(sc);
3734 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3735 "%s: %6D: TID=%d, called\n",
3737 tid->an->an_node.ni_macaddr,
3741 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3744 * This is an error condition!
3746 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3747 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3748 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3749 __func__, tid->an->an_node.ni_macaddr, ":",
3750 tid->tid, tid->bar_tx, tid->bar_wait);
3754 /* Don't do anything if we still have pending frames */
3755 if (tid->hwq_depth > 0) {
3756 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3757 "%s: %6D: TID=%d, hwq_depth=%d, waiting\n",
3759 tid->an->an_node.ni_macaddr,
3766 /* We're now about to TX */
3770 * Override the clrdmask configuration for the next frame,
3771 * just to get the ball rolling.
3773 ath_tx_set_clrdmask(sc, tid->an);
3776 * Calculate new BAW left edge, now that all frames have either
3777 * succeeded or failed.
3779 * XXX verify this is _actually_ the valid value to begin at!
3781 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3782 "%s: %6D: TID=%d, new BAW left edge=%d\n",
3784 tid->an->an_node.ni_macaddr,
3789 /* Try sending the BAR frame */
3790 /* We can't hold the lock here! */
3793 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3794 /* Success? Now we wait for notification that it's done */
3799 /* Failure? For now, warn loudly and continue */
3801 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3802 "%s: %6D: TID=%d, failed to TX BAR, continue!\n",
3803 __func__, tid->an->an_node.ni_macaddr, ":",
3805 ath_tx_tid_bar_unsuspend(sc, tid);
3809 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3810 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3813 ATH_TX_LOCK_ASSERT(sc);
3816 * If the current TID is running AMPDU, update
3819 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3820 bf->bf_state.bfs_dobaw) {
3822 * Only remove the frame from the BAW if it's
3823 * been transmitted at least once; this means
3824 * the frame was in the BAW to begin with.
3826 if (bf->bf_state.bfs_retries > 0) {
3827 ath_tx_update_baw(sc, an, tid, bf);
3828 bf->bf_state.bfs_dobaw = 0;
3832 * This has become a non-fatal error now
3834 if (! bf->bf_state.bfs_addedbaw)
3835 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3836 "%s: wasn't added: seqno %d\n",
3837 __func__, SEQNO(bf->bf_state.bfs_seqno));
3841 /* Strip it out of an aggregate list if it was in one */
3844 /* Insert on the free queue to be freed by the caller */
3845 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3849 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3850 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3852 struct ieee80211_node *ni = &an->an_node;
3853 struct ath_txq *txq;
3854 struct ieee80211_tx_ampdu *tap;
3856 txq = sc->sc_ac2q[tid->ac];
3857 tap = ath_tx_get_tx_tid(an, tid->tid);
3859 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3860 "%s: %s: %6D: bf=%p: addbaw=%d, dobaw=%d, "
3861 "seqno=%d, retry=%d\n",
3867 bf->bf_state.bfs_addedbaw,
3868 bf->bf_state.bfs_dobaw,
3869 SEQNO(bf->bf_state.bfs_seqno),
3870 bf->bf_state.bfs_retries);
3871 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3872 "%s: %s: %6D: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3880 txq->axq_aggr_depth);
3881 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3882 "%s: %s: %6D: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3893 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3894 "%s: %s: %6D: tid %d: "
3895 "sched=%d, paused=%d, "
3896 "incomp=%d, baw_head=%d, "
3897 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3903 tid->sched, tid->paused,
3904 tid->incomp, tid->baw_head,
3905 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3906 ni->ni_txseqs[tid->tid]);
3908 /* XXX Dump the frame, see what it is? */
3909 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
3910 ieee80211_dump_pkt(ni->ni_ic,
3911 mtod(bf->bf_m, const uint8_t *),
3912 bf->bf_m->m_len, 0, -1);
3916 * Free any packets currently pending in the software TX queue.
3918 * This will be called when a node is being deleted.
3920 * It can also be called on an active node during an interface
3921 * reset or state transition.
3923 * (From Linux/reference):
3925 * TODO: For frame(s) that are in the retry state, we will reuse the
3926 * sequence number(s) without setting the retry bit. The
3927 * alternative is to give up on these and BAR the receiver's window
3931 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3932 struct ath_tid *tid, ath_bufhead *bf_cq)
3935 struct ieee80211_tx_ampdu *tap;
3936 struct ieee80211_node *ni = &an->an_node;
3939 tap = ath_tx_get_tx_tid(an, tid->tid);
3941 ATH_TX_LOCK_ASSERT(sc);
3943 /* Walk the queue, free frames */
3946 bf = ATH_TID_FIRST(tid);
3952 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3956 ATH_TID_REMOVE(tid, bf, bf_list);
3957 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3960 /* And now, drain the filtered frame queue */
3963 bf = ATH_TID_FILT_FIRST(tid);
3968 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3972 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3973 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3977 * Override the clrdmask configuration for the next frame
3978 * in case there is some future transmission, just to get
3981 * This won't hurt things if the TID is about to be freed.
3983 ath_tx_set_clrdmask(sc, tid->an);
3986 * Now that it's completed, grab the TID lock and update
3987 * the sequence number and BAW window.
3988 * Because sequence numbers have been assigned to frames
3989 * that haven't been sent yet, it's entirely possible
3990 * we'll be called with some pending frames that have not
3993 * The cleaner solution is to do the sequence number allocation
3994 * when the packet is first transmitted - and thus the "retries"
3995 * check above would be enough to update the BAW/seqno.
3998 /* But don't do it for non-QoS TIDs */
4001 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4002 "%s: %6D: node %p: TID %d: sliding BAW left edge to %d\n",
4010 ni->ni_txseqs[tid->tid] = tap->txa_start;
4011 tid->baw_tail = tid->baw_head;
4016 * Reset the TID state. This must be only called once the node has
4017 * had its frames flushed from this TID, to ensure that no other
4018 * pause / unpause logic can kick in.
4021 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
4025 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
4026 tid->paused = tid->sched = tid->addba_tx_pending = 0;
4027 tid->incomp = tid->cleanup_inprogress = 0;
4031 * If we have a bar_wait set, we need to unpause the TID
4032 * here. Otherwise once cleanup has finished, the TID won't
4033 * have the right paused counter.
4035 * XXX I'm not going through resume here - I don't want the
4036 * node to be rescheuled just yet. This however should be
4039 if (tid->bar_wait) {
4040 if (tid->paused > 0) {
4046 * XXX same with a currently filtered TID.
4048 * Since this is being called during a flush, we assume that
4049 * the filtered frame list is actually empty.
4051 * XXX TODO: add in a check to ensure that the filtered queue
4052 * depth is actually 0!
4054 if (tid->isfiltered) {
4055 if (tid->paused > 0) {
4061 * Clear BAR, filtered frames, scheduled and ADDBA pending.
4062 * The TID may be going through cleanup from the last association
4063 * where things in the BAW are still in the hardware queue.
4067 tid->isfiltered = 0;
4069 tid->addba_tx_pending = 0;
4072 * XXX TODO: it may just be enough to walk the HWQs and mark
4073 * frames for that node as non-aggregate; or mark the ath_node
4074 * with something that indicates that aggregation is no longer
4075 * occurring. Then we can just toss the BAW complaints and
4076 * do a complete hard reset of state here - no pause, no
4077 * complete counter, etc.
4083 * Flush all software queued packets for the given node.
4085 * This occurs when a completion handler frees the last buffer
4086 * for a node, and the node is thus freed. This causes the node
4087 * to be cleaned up, which ends up calling ath_tx_node_flush.
4090 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
4098 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
4102 DPRINTF(sc, ATH_DEBUG_NODE,
4103 "%s: %6D: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
4104 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
4106 an->an_node.ni_macaddr,
4108 an->an_is_powersave,
4115 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
4116 struct ath_tid *atid = &an->an_tid[tid];
4119 ath_tx_tid_drain(sc, an, atid, &bf_cq);
4121 /* Remove this tid from the list of active tids */
4122 ath_tx_tid_unsched(sc, atid);
4124 /* Reset the per-TID pause, BAR, etc state */
4125 ath_tx_tid_reset(sc, atid);
4129 * Clear global leak count
4131 an->an_leak_count = 0;
4134 /* Handle completed frames */
4135 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4136 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4137 ath_tx_default_comp(sc, bf, 0);
4142 * Drain all the software TXQs currently with traffic queued.
4145 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
4147 struct ath_tid *tid;
4155 * Iterate over all active tids for the given txq,
4156 * flushing and unsched'ing them
4158 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
4159 tid = TAILQ_FIRST(&txq->axq_tidq);
4160 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
4161 ath_tx_tid_unsched(sc, tid);
4166 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4167 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4168 ath_tx_default_comp(sc, bf, 0);
4173 * Handle completion of non-aggregate session frames.
4175 * This (currently) doesn't implement software retransmission of
4176 * non-aggregate frames!
4178 * Software retransmission of non-aggregate frames needs to obey
4179 * the strict sequence number ordering, and drop any frames that
4182 * For now, filtered frames and frame transmission will cause
4183 * all kinds of issues. So we don't support them.
4185 * So anyone queuing frames via ath_tx_normal_xmit() or
4186 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4189 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4191 struct ieee80211_node *ni = bf->bf_node;
4192 struct ath_node *an = ATH_NODE(ni);
4193 int tid = bf->bf_state.bfs_tid;
4194 struct ath_tid *atid = &an->an_tid[tid];
4195 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4197 /* The TID state is protected behind the TXQ lock */
4200 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4201 __func__, bf, fail, atid->hwq_depth - 1);
4207 * If the frame was filtered, stick it on the filter frame
4208 * queue and complain about it. It shouldn't happen!
4210 if ((ts->ts_status & HAL_TXERR_FILT) ||
4211 (ts->ts_status != 0 && atid->isfiltered)) {
4212 DPRINTF(sc, ATH_DEBUG_SW_TX,
4213 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4217 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4220 if (atid->isfiltered)
4221 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4222 if (atid->hwq_depth < 0)
4223 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4224 __func__, atid->hwq_depth);
4226 /* If the TID is being cleaned up, track things */
4228 if (atid->cleanup_inprogress) {
4230 if (atid->incomp == 0) {
4231 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4232 "%s: TID %d: cleaned up! resume!\n",
4234 atid->cleanup_inprogress = 0;
4235 ath_tx_tid_resume(sc, atid);
4240 * If the queue is filtered, potentially mark it as complete
4241 * and reschedule it as needed.
4243 * This is required as there may be a subsequent TX descriptor
4244 * for this end-node that has CLRDMASK set, so it's quite possible
4245 * that a filtered frame will be followed by a non-filtered
4246 * (complete or otherwise) frame.
4248 * XXX should we do this before we complete the frame?
4250 if (atid->isfiltered)
4251 ath_tx_tid_filt_comp_complete(sc, atid);
4255 * punt to rate control if we're not being cleaned up
4256 * during a hw queue drain and the frame wanted an ACK.
4258 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4259 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4260 ts, bf->bf_state.bfs_pktlen,
4261 1, (ts->ts_status == 0) ? 0 : 1);
4263 ath_tx_default_comp(sc, bf, fail);
4267 * Handle cleanup of aggregate session packets that aren't
4270 * There's no need to update the BAW here - the session is being
4274 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4276 struct ieee80211_node *ni = bf->bf_node;
4277 struct ath_node *an = ATH_NODE(ni);
4278 int tid = bf->bf_state.bfs_tid;
4279 struct ath_tid *atid = &an->an_tid[tid];
4281 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4282 __func__, tid, atid->incomp);
4288 if (bf->bf_state.bfs_dobaw) {
4289 ath_tx_update_baw(sc, an, atid, bf);
4290 if (!bf->bf_state.bfs_addedbaw)
4291 DPRINTF(sc, ATH_DEBUG_SW_TX,
4292 "%s: wasn't added: seqno %d\n",
4293 __func__, SEQNO(bf->bf_state.bfs_seqno));
4296 if (atid->incomp == 0) {
4297 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4298 "%s: TID %d: cleaned up! resume!\n",
4300 atid->cleanup_inprogress = 0;
4301 ath_tx_tid_resume(sc, atid);
4305 ath_tx_default_comp(sc, bf, 0);
4310 * This as it currently stands is a bit dumb. Ideally we'd just
4311 * fail the frame the normal way and have it permanently fail
4312 * via the normal aggregate completion path.
4315 ath_tx_tid_cleanup_frame(struct ath_softc *sc, struct ath_node *an,
4316 int tid, struct ath_buf *bf_head, ath_bufhead *bf_cq)
4318 struct ath_tid *atid = &an->an_tid[tid];
4319 struct ath_buf *bf, *bf_next;
4321 ATH_TX_LOCK_ASSERT(sc);
4324 * Remove this frame from the queue.
4326 ATH_TID_REMOVE(atid, bf_head, bf_list);
4329 * Loop over all the frames in the aggregate.
4332 while (bf != NULL) {
4333 bf_next = bf->bf_next; /* next aggregate frame, or NULL */
4336 * If it's been added to the BAW we need to kick
4337 * it out of the BAW before we continue.
4339 * XXX if it's an aggregate, assert that it's in the
4340 * BAW - we shouldn't have it be in an aggregate
4343 if (bf->bf_state.bfs_addedbaw) {
4344 ath_tx_update_baw(sc, an, atid, bf);
4345 bf->bf_state.bfs_dobaw = 0;
4349 * Give it the default completion handler.
4351 bf->bf_comp = ath_tx_normal_comp;
4355 * Add it to the list to free.
4357 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4360 * Now advance to the next frame in the aggregate.
4367 * Performs transmit side cleanup when TID changes from aggregated to
4368 * unaggregated and during reassociation.
4370 * For now, this just tosses everything from the TID software queue
4371 * whether or not it has been retried and marks the TID as
4372 * pending completion if there's anything for this TID queued to
4375 * The caller is responsible for pausing the TID and unpausing the
4376 * TID if no cleanup was required. Otherwise the cleanup path will
4377 * unpause the TID once the last hardware queued frame is completed.
4380 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4383 struct ath_tid *atid = &an->an_tid[tid];
4384 struct ath_buf *bf, *bf_next;
4386 ATH_TX_LOCK_ASSERT(sc);
4388 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4389 "%s: TID %d: called; inprogress=%d\n", __func__, tid,
4390 atid->cleanup_inprogress);
4393 * Move the filtered frames to the TX queue, before
4394 * we run off and discard/process things.
4397 /* XXX this is really quite inefficient */
4398 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4399 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4400 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4404 * Update the frames in the software TX queue:
4406 * + Discard retry frames in the queue
4407 * + Fix the completion function to be non-aggregate
4409 bf = ATH_TID_FIRST(atid);
4412 * Grab the next frame in the list, we may
4413 * be fiddling with the list.
4415 bf_next = TAILQ_NEXT(bf, bf_list);
4418 * Free the frame and all subframes.
4420 ath_tx_tid_cleanup_frame(sc, an, tid, bf, bf_cq);
4429 * If there's anything in the hardware queue we wait
4430 * for the TID HWQ to empty.
4432 if (atid->hwq_depth > 0) {
4434 * XXX how about we kill atid->incomp, and instead
4435 * replace it with a macro that checks that atid->hwq_depth
4438 atid->incomp = atid->hwq_depth;
4439 atid->cleanup_inprogress = 1;
4442 if (atid->cleanup_inprogress)
4443 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4444 "%s: TID %d: cleanup needed: %d packets\n",
4445 __func__, tid, atid->incomp);
4447 /* Owner now must free completed frames */
4450 static struct ath_buf *
4451 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4452 struct ath_tid *tid, struct ath_buf *bf)
4454 struct ath_buf *nbf;
4458 * Clone the buffer. This will handle the dma unmap and
4459 * copy the node reference to the new buffer. If this
4460 * works out, 'bf' will have no DMA mapping, no mbuf
4461 * pointer and no node reference.
4463 nbf = ath_buf_clone(sc, bf);
4466 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4471 /* Failed to clone */
4472 DPRINTF(sc, ATH_DEBUG_XMIT,
4473 "%s: failed to clone a busy buffer\n",
4478 /* Setup the dma for the new buffer */
4479 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4481 DPRINTF(sc, ATH_DEBUG_XMIT,
4482 "%s: failed to setup dma for clone\n",
4485 * Put this at the head of the list, not tail;
4486 * that way it doesn't interfere with the
4487 * busy buffer logic (which uses the tail of
4491 ath_returnbuf_head(sc, nbf);
4492 ATH_TXBUF_UNLOCK(sc);
4496 /* Update BAW if required, before we free the original buf */
4497 if (bf->bf_state.bfs_dobaw)
4498 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4500 /* Free original buffer; return new buffer */
4501 ath_freebuf(sc, bf);
4507 * Handle retrying an unaggregate frame in an aggregate
4510 * If too many retries occur, pause the TID, wait for
4511 * any further retransmits (as there's no reason why
4512 * non-aggregate frames in an aggregate session are
4513 * transmitted in-order; they just have to be in-BAW)
4514 * and then queue a BAR.
4517 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4519 struct ieee80211_node *ni = bf->bf_node;
4520 struct ath_node *an = ATH_NODE(ni);
4521 int tid = bf->bf_state.bfs_tid;
4522 struct ath_tid *atid = &an->an_tid[tid];
4523 struct ieee80211_tx_ampdu *tap;
4527 tap = ath_tx_get_tx_tid(an, tid);
4530 * If the buffer is marked as busy, we can't directly
4531 * reuse it. Instead, try to clone the buffer.
4532 * If the clone is successful, recycle the old buffer.
4533 * If the clone is unsuccessful, set bfs_retries to max
4534 * to force the next bit of code to free the buffer
4537 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4538 (bf->bf_flags & ATH_BUF_BUSY)) {
4539 struct ath_buf *nbf;
4540 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4542 /* bf has been freed at this point */
4545 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4548 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4549 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4550 "%s: exceeded retries; seqno %d\n",
4551 __func__, SEQNO(bf->bf_state.bfs_seqno));
4552 sc->sc_stats.ast_tx_swretrymax++;
4554 /* Update BAW anyway */
4555 if (bf->bf_state.bfs_dobaw) {
4556 ath_tx_update_baw(sc, an, atid, bf);
4557 if (! bf->bf_state.bfs_addedbaw)
4558 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4559 "%s: wasn't added: seqno %d\n",
4560 __func__, SEQNO(bf->bf_state.bfs_seqno));
4562 bf->bf_state.bfs_dobaw = 0;
4564 /* Suspend the TX queue and get ready to send the BAR */
4565 ath_tx_tid_bar_suspend(sc, atid);
4567 /* Send the BAR if there are no other frames waiting */
4568 if (ath_tx_tid_bar_tx_ready(sc, atid))
4569 ath_tx_tid_bar_tx(sc, atid);
4573 /* Free buffer, bf is free after this call */
4574 ath_tx_default_comp(sc, bf, 0);
4579 * This increments the retry counter as well as
4580 * sets the retry flag in the ath_buf and packet
4583 ath_tx_set_retry(sc, bf);
4584 sc->sc_stats.ast_tx_swretries++;
4587 * Insert this at the head of the queue, so it's
4588 * retried before any current/subsequent frames.
4590 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4591 ath_tx_tid_sched(sc, atid);
4592 /* Send the BAR if there are no other frames waiting */
4593 if (ath_tx_tid_bar_tx_ready(sc, atid))
4594 ath_tx_tid_bar_tx(sc, atid);
4600 * Common code for aggregate excessive retry/subframe retry.
4601 * If retrying, queues buffers to bf_q. If not, frees the
4604 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4607 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4610 struct ieee80211_node *ni = bf->bf_node;
4611 struct ath_node *an = ATH_NODE(ni);
4612 int tid = bf->bf_state.bfs_tid;
4613 struct ath_tid *atid = &an->an_tid[tid];
4615 ATH_TX_LOCK_ASSERT(sc);
4617 /* XXX clr11naggr should be done for all subframes */
4618 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4619 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4621 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4624 * If the buffer is marked as busy, we can't directly
4625 * reuse it. Instead, try to clone the buffer.
4626 * If the clone is successful, recycle the old buffer.
4627 * If the clone is unsuccessful, set bfs_retries to max
4628 * to force the next bit of code to free the buffer
4631 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4632 (bf->bf_flags & ATH_BUF_BUSY)) {
4633 struct ath_buf *nbf;
4634 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4636 /* bf has been freed at this point */
4639 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4642 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4643 sc->sc_stats.ast_tx_swretrymax++;
4644 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4645 "%s: max retries: seqno %d\n",
4646 __func__, SEQNO(bf->bf_state.bfs_seqno));
4647 ath_tx_update_baw(sc, an, atid, bf);
4648 if (!bf->bf_state.bfs_addedbaw)
4649 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4650 "%s: wasn't added: seqno %d\n",
4651 __func__, SEQNO(bf->bf_state.bfs_seqno));
4652 bf->bf_state.bfs_dobaw = 0;
4656 ath_tx_set_retry(sc, bf);
4657 sc->sc_stats.ast_tx_swretries++;
4658 bf->bf_next = NULL; /* Just to make sure */
4660 /* Clear the aggregate state */
4661 bf->bf_state.bfs_aggr = 0;
4662 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4663 bf->bf_state.bfs_nframes = 1;
4665 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4670 * error pkt completion for an aggregate destination
4673 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4674 struct ath_tid *tid)
4676 struct ieee80211_node *ni = bf_first->bf_node;
4677 struct ath_node *an = ATH_NODE(ni);
4678 struct ath_buf *bf_next, *bf;
4681 struct ieee80211_tx_ampdu *tap;
4688 * Update rate control - all frames have failed.
4690 * XXX use the length in the first frame in the series;
4691 * XXX just so things are consistent for now.
4693 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4694 &bf_first->bf_status.ds_txstat,
4695 bf_first->bf_state.bfs_pktlen,
4696 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4699 tap = ath_tx_get_tx_tid(an, tid->tid);
4700 sc->sc_stats.ast_tx_aggr_failall++;
4702 /* Retry all subframes */
4705 bf_next = bf->bf_next;
4706 bf->bf_next = NULL; /* Remove it from the aggr list */
4707 sc->sc_stats.ast_tx_aggr_fail++;
4708 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4711 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4716 /* Prepend all frames to the beginning of the queue */
4717 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4718 TAILQ_REMOVE(&bf_q, bf, bf_list);
4719 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4723 * Schedule the TID to be re-tried.
4725 ath_tx_tid_sched(sc, tid);
4728 * send bar if we dropped any frames
4730 * Keep the txq lock held for now, as we need to ensure
4731 * that ni_txseqs[] is consistent (as it's being updated
4732 * in the ifnet TX context or raw TX context.)
4735 /* Suspend the TX queue and get ready to send the BAR */
4736 ath_tx_tid_bar_suspend(sc, tid);
4740 * Send BAR if required
4742 if (ath_tx_tid_bar_tx_ready(sc, tid))
4743 ath_tx_tid_bar_tx(sc, tid);
4747 /* Complete frames which errored out */
4748 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4749 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4750 ath_tx_default_comp(sc, bf, 0);
4755 * Handle clean-up of packets from an aggregate list.
4757 * There's no need to update the BAW here - the session is being
4761 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4763 struct ath_buf *bf, *bf_next;
4764 struct ieee80211_node *ni = bf_first->bf_node;
4765 struct ath_node *an = ATH_NODE(ni);
4766 int tid = bf_first->bf_state.bfs_tid;
4767 struct ath_tid *atid = &an->an_tid[tid];
4774 /* Update the BAW */
4778 if (bf->bf_state.bfs_dobaw) {
4779 ath_tx_update_baw(sc, an, atid, bf);
4780 if (!bf->bf_state.bfs_addedbaw)
4781 DPRINTF(sc, ATH_DEBUG_SW_TX,
4782 "%s: wasn't added: seqno %d\n",
4783 __func__, SEQNO(bf->bf_state.bfs_seqno));
4788 if (atid->incomp == 0) {
4789 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4790 "%s: TID %d: cleaned up! resume!\n",
4792 atid->cleanup_inprogress = 0;
4793 ath_tx_tid_resume(sc, atid);
4796 /* Send BAR if required */
4797 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4799 * XXX TODO: we should likely just tear down the BAR state here,
4800 * rather than sending a BAR.
4802 if (ath_tx_tid_bar_tx_ready(sc, atid))
4803 ath_tx_tid_bar_tx(sc, atid);
4807 /* Handle frame completion as individual frames */
4810 bf_next = bf->bf_next;
4812 ath_tx_default_comp(sc, bf, 1);
4818 * Handle completion of an set of aggregate frames.
4820 * Note: the completion handler is the last descriptor in the aggregate,
4821 * not the last descriptor in the first frame.
4824 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4827 //struct ath_desc *ds = bf->bf_lastds;
4828 struct ieee80211_node *ni = bf_first->bf_node;
4829 struct ath_node *an = ATH_NODE(ni);
4830 int tid = bf_first->bf_state.bfs_tid;
4831 struct ath_tid *atid = &an->an_tid[tid];
4832 struct ath_tx_status ts;
4833 struct ieee80211_tx_ampdu *tap;
4839 struct ath_buf *bf, *bf_next;
4842 int nframes = 0, nbad = 0, nf;
4844 /* XXX there's too much on the stack? */
4845 struct ath_rc_series rc[ATH_RC_NUM];
4848 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4849 __func__, atid->hwq_depth);
4852 * Take a copy; this may be needed -after- bf_first
4853 * has been completed and freed.
4855 ts = bf_first->bf_status.ds_txstat;
4860 /* The TID state is kept behind the TXQ lock */
4864 if (atid->hwq_depth < 0)
4865 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4866 __func__, atid->hwq_depth);
4869 * If the TID is filtered, handle completing the filter
4870 * transition before potentially kicking it to the cleanup
4873 * XXX this is duplicate work, ew.
4875 if (atid->isfiltered)
4876 ath_tx_tid_filt_comp_complete(sc, atid);
4879 * Punt cleanup to the relevant function, not our problem now
4881 if (atid->cleanup_inprogress) {
4882 if (atid->isfiltered)
4883 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4884 "%s: isfiltered=1, normal_comp?\n",
4887 ath_tx_comp_cleanup_aggr(sc, bf_first);
4892 * If the frame is filtered, transition to filtered frame
4893 * mode and add this to the filtered frame list.
4895 * XXX TODO: figure out how this interoperates with
4896 * BAR, pause and cleanup states.
4898 if ((ts.ts_status & HAL_TXERR_FILT) ||
4899 (ts.ts_status != 0 && atid->isfiltered)) {
4901 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4902 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4903 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4905 /* Remove from BAW */
4906 TAILQ_FOREACH_SAFE(bf, &bf_cq, bf_list, bf_next) {
4907 if (bf->bf_state.bfs_addedbaw)
4909 if (bf->bf_state.bfs_dobaw) {
4910 ath_tx_update_baw(sc, an, atid, bf);
4911 if (!bf->bf_state.bfs_addedbaw)
4912 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4913 "%s: wasn't added: seqno %d\n",
4915 SEQNO(bf->bf_state.bfs_seqno));
4917 bf->bf_state.bfs_dobaw = 0;
4920 * If any intermediate frames in the BAW were dropped when
4921 * handling filtering things, send a BAR.
4924 ath_tx_tid_bar_suspend(sc, atid);
4927 * Finish up by sending a BAR if required and freeing
4928 * the frames outside of the TX lock.
4930 goto finish_send_bar;
4934 * XXX for now, use the first frame in the aggregate for
4935 * XXX rate control completion; it's at least consistent.
4937 pktlen = bf_first->bf_state.bfs_pktlen;
4940 * Handle errors first!
4942 * Here, handle _any_ error as a "exceeded retries" error.
4943 * Later on (when filtered frames are to be specially handled)
4944 * it'll have to be expanded.
4947 if (ts.ts_status & HAL_TXERR_XRETRY) {
4949 if (ts.ts_status != 0) {
4951 ath_tx_comp_aggr_error(sc, bf_first, atid);
4955 tap = ath_tx_get_tx_tid(an, tid);
4958 * extract starting sequence and block-ack bitmap
4960 /* XXX endian-ness of seq_st, ba? */
4961 seq_st = ts.ts_seqnum;
4962 hasba = !! (ts.ts_flags & HAL_TX_BA);
4963 tx_ok = (ts.ts_status == 0);
4964 isaggr = bf_first->bf_state.bfs_aggr;
4965 ba[0] = ts.ts_ba_low;
4966 ba[1] = ts.ts_ba_high;
4969 * Copy the TX completion status and the rate control
4970 * series from the first descriptor, as it may be freed
4971 * before the rate control code can get its grubby fingers
4974 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4976 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4977 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4978 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4979 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4980 isaggr, seq_st, hasba, ba[0], ba[1]);
4983 * The reference driver doesn't do this; it simply ignores
4984 * this check in its entirety.
4986 * I've seen this occur when using iperf to send traffic
4987 * out tid 1 - the aggregate frames are all marked as TID 1,
4988 * but the TXSTATUS has TID=0. So, let's just ignore this
4992 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4993 if (tid != ts.ts_tid) {
4994 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4995 __func__, tid, ts.ts_tid);
5000 /* AR5416 BA bug; this requires an interface reset */
5001 if (isaggr && tx_ok && (! hasba)) {
5002 device_printf(sc->sc_dev,
5003 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
5005 __func__, hasba, tx_ok, isaggr, seq_st);
5006 /* XXX TODO: schedule an interface reset */
5008 ath_printtxbuf(sc, bf_first,
5009 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
5014 * Walk the list of frames, figure out which ones were correctly
5015 * sent and which weren't.
5018 nf = bf_first->bf_state.bfs_nframes;
5020 /* bf_first is going to be invalid once this list is walked */
5024 * Walk the list of completed frames and determine
5025 * which need to be completed and which need to be
5028 * For completed frames, the completion functions need
5029 * to be called at the end of this function as the last
5030 * node reference may free the node.
5032 * Finally, since the TXQ lock can't be held during the
5033 * completion callback (to avoid lock recursion),
5034 * the completion calls have to be done outside of the
5039 ba_index = ATH_BA_INDEX(seq_st,
5040 SEQNO(bf->bf_state.bfs_seqno));
5041 bf_next = bf->bf_next;
5042 bf->bf_next = NULL; /* Remove it from the aggr list */
5044 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5045 "%s: checking bf=%p seqno=%d; ack=%d\n",
5046 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
5047 ATH_BA_ISSET(ba, ba_index));
5049 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
5050 sc->sc_stats.ast_tx_aggr_ok++;
5051 ath_tx_update_baw(sc, an, atid, bf);
5052 bf->bf_state.bfs_dobaw = 0;
5053 if (!bf->bf_state.bfs_addedbaw)
5054 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5055 "%s: wasn't added: seqno %d\n",
5056 __func__, SEQNO(bf->bf_state.bfs_seqno));
5058 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
5060 sc->sc_stats.ast_tx_aggr_fail++;
5061 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
5064 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
5072 * Now that the BAW updates have been done, unlock
5074 * txseq is grabbed before the lock is released so we
5075 * have a consistent view of what -was- in the BAW.
5076 * Anything after this point will not yet have been
5079 txseq = tap->txa_start;
5083 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5084 "%s: num frames seen=%d; bf nframes=%d\n",
5085 __func__, nframes, nf);
5088 * Now we know how many frames were bad, call the rate
5092 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
5096 * send bar if we dropped any frames
5099 /* Suspend the TX queue and get ready to send the BAR */
5101 ath_tx_tid_bar_suspend(sc, atid);
5105 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5106 "%s: txa_start now %d\n", __func__, tap->txa_start);
5110 /* Prepend all frames to the beginning of the queue */
5111 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
5112 TAILQ_REMOVE(&bf_q, bf, bf_list);
5113 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
5117 * Reschedule to grab some further frames.
5119 ath_tx_tid_sched(sc, atid);
5122 * If the queue is filtered, re-schedule as required.
5124 * This is required as there may be a subsequent TX descriptor
5125 * for this end-node that has CLRDMASK set, so it's quite possible
5126 * that a filtered frame will be followed by a non-filtered
5127 * (complete or otherwise) frame.
5129 * XXX should we do this before we complete the frame?
5131 if (atid->isfiltered)
5132 ath_tx_tid_filt_comp_complete(sc, atid);
5137 * Send BAR if required
5139 if (ath_tx_tid_bar_tx_ready(sc, atid))
5140 ath_tx_tid_bar_tx(sc, atid);
5144 /* Do deferred completion */
5145 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5146 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5147 ath_tx_default_comp(sc, bf, 0);
5152 * Handle completion of unaggregated frames in an ADDBA
5155 * Fail is set to 1 if the entry is being freed via a call to
5156 * ath_tx_draintxq().
5159 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
5161 struct ieee80211_node *ni = bf->bf_node;
5162 struct ath_node *an = ATH_NODE(ni);
5163 int tid = bf->bf_state.bfs_tid;
5164 struct ath_tid *atid = &an->an_tid[tid];
5165 struct ath_tx_status ts;
5169 * Take a copy of this; filtering/cloning the frame may free the
5172 ts = bf->bf_status.ds_txstat;
5175 * Update rate control status here, before we possibly
5176 * punt to retry or cleanup.
5178 * Do it outside of the TXQ lock.
5180 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
5181 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
5182 &bf->bf_status.ds_txstat,
5183 bf->bf_state.bfs_pktlen,
5184 1, (ts.ts_status == 0) ? 0 : 1);
5187 * This is called early so atid->hwq_depth can be tracked.
5188 * This unfortunately means that it's released and regrabbed
5189 * during retry and cleanup. That's rather inefficient.
5193 if (tid == IEEE80211_NONQOS_TID)
5194 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
5196 DPRINTF(sc, ATH_DEBUG_SW_TX,
5197 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
5198 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
5199 SEQNO(bf->bf_state.bfs_seqno));
5202 if (atid->hwq_depth < 0)
5203 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
5204 __func__, atid->hwq_depth);
5207 * If the TID is filtered, handle completing the filter
5208 * transition before potentially kicking it to the cleanup
5211 if (atid->isfiltered)
5212 ath_tx_tid_filt_comp_complete(sc, atid);
5215 * If a cleanup is in progress, punt to comp_cleanup;
5216 * rather than handling it here. It's thus their
5217 * responsibility to clean up, call the completion
5218 * function in net80211, etc.
5220 if (atid->cleanup_inprogress) {
5221 if (atid->isfiltered)
5222 DPRINTF(sc, ATH_DEBUG_SW_TX,
5223 "%s: isfiltered=1, normal_comp?\n",
5226 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
5228 ath_tx_comp_cleanup_unaggr(sc, bf);
5233 * XXX TODO: how does cleanup, BAR and filtered frame handling
5236 * If the frame is filtered OR if it's any failure but
5237 * the TID is filtered, the frame must be added to the
5238 * filtered frame list.
5240 * However - a busy buffer can't be added to the filtered
5241 * list as it will end up being recycled without having
5242 * been made available for the hardware.
5244 if ((ts.ts_status & HAL_TXERR_FILT) ||
5245 (ts.ts_status != 0 && atid->isfiltered)) {
5249 DPRINTF(sc, ATH_DEBUG_SW_TX,
5250 "%s: isfiltered=1, fail=%d\n",
5252 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5254 * If freeframe=0 then bf is no longer ours; don't
5258 /* Remove from BAW */
5259 if (bf->bf_state.bfs_addedbaw)
5261 if (bf->bf_state.bfs_dobaw) {
5262 ath_tx_update_baw(sc, an, atid, bf);
5263 if (!bf->bf_state.bfs_addedbaw)
5264 DPRINTF(sc, ATH_DEBUG_SW_TX,
5265 "%s: wasn't added: seqno %d\n",
5266 __func__, SEQNO(bf->bf_state.bfs_seqno));
5268 bf->bf_state.bfs_dobaw = 0;
5272 * If the frame couldn't be filtered, treat it as a drop and
5273 * prepare to send a BAR.
5275 if (freeframe && drops)
5276 ath_tx_tid_bar_suspend(sc, atid);
5279 * Send BAR if required
5281 if (ath_tx_tid_bar_tx_ready(sc, atid))
5282 ath_tx_tid_bar_tx(sc, atid);
5286 * If freeframe is set, then the frame couldn't be
5287 * cloned and bf is still valid. Just complete/free it.
5290 ath_tx_default_comp(sc, bf, fail);
5295 * Don't bother with the retry check if all frames
5296 * are being failed (eg during queue deletion.)
5299 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5301 if (fail == 0 && ts.ts_status != 0) {
5303 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5305 ath_tx_aggr_retry_unaggr(sc, bf);
5309 /* Success? Complete */
5310 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5311 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5312 if (bf->bf_state.bfs_dobaw) {
5313 ath_tx_update_baw(sc, an, atid, bf);
5314 bf->bf_state.bfs_dobaw = 0;
5315 if (!bf->bf_state.bfs_addedbaw)
5316 DPRINTF(sc, ATH_DEBUG_SW_TX,
5317 "%s: wasn't added: seqno %d\n",
5318 __func__, SEQNO(bf->bf_state.bfs_seqno));
5322 * If the queue is filtered, re-schedule as required.
5324 * This is required as there may be a subsequent TX descriptor
5325 * for this end-node that has CLRDMASK set, so it's quite possible
5326 * that a filtered frame will be followed by a non-filtered
5327 * (complete or otherwise) frame.
5329 * XXX should we do this before we complete the frame?
5331 if (atid->isfiltered)
5332 ath_tx_tid_filt_comp_complete(sc, atid);
5335 * Send BAR if required
5337 if (ath_tx_tid_bar_tx_ready(sc, atid))
5338 ath_tx_tid_bar_tx(sc, atid);
5342 ath_tx_default_comp(sc, bf, fail);
5343 /* bf is freed at this point */
5347 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5349 if (bf->bf_state.bfs_aggr)
5350 ath_tx_aggr_comp_aggr(sc, bf, fail);
5352 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5356 * Schedule some packets from the given node/TID to the hardware.
5358 * This is the aggregate version.
5361 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5362 struct ath_tid *tid)
5365 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5366 struct ieee80211_tx_ampdu *tap;
5367 ATH_AGGR_STATUS status;
5370 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5371 ATH_TX_LOCK_ASSERT(sc);
5374 * XXX TODO: If we're called for a queue that we're leaking frames to,
5375 * ensure we only leak one.
5378 tap = ath_tx_get_tx_tid(an, tid->tid);
5380 if (tid->tid == IEEE80211_NONQOS_TID)
5381 DPRINTF(sc, ATH_DEBUG_SW_TX,
5382 "%s: called for TID=NONQOS_TID?\n", __func__);
5385 status = ATH_AGGR_DONE;
5388 * If the upper layer has paused the TID, don't
5389 * queue any further packets.
5391 * This can also occur from the completion task because
5392 * of packet loss; but as its serialised with this code,
5393 * it won't "appear" half way through queuing packets.
5395 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5398 bf = ATH_TID_FIRST(tid);
5404 * If the packet doesn't fall within the BAW (eg a NULL
5405 * data frame), schedule it directly; continue.
5407 if (! bf->bf_state.bfs_dobaw) {
5408 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5409 "%s: non-baw packet\n",
5411 ATH_TID_REMOVE(tid, bf, bf_list);
5413 if (bf->bf_state.bfs_nframes > 1)
5414 DPRINTF(sc, ATH_DEBUG_SW_TX,
5415 "%s: aggr=%d, nframes=%d\n",
5417 bf->bf_state.bfs_aggr,
5418 bf->bf_state.bfs_nframes);
5421 * This shouldn't happen - such frames shouldn't
5422 * ever have been queued as an aggregate in the
5423 * first place. However, make sure the fields
5424 * are correctly setup just to be totally sure.
5426 bf->bf_state.bfs_aggr = 0;
5427 bf->bf_state.bfs_nframes = 1;
5429 /* Update CLRDMASK just before this frame is queued */
5430 ath_tx_update_clrdmask(sc, tid, bf);
5432 ath_tx_do_ratelookup(sc, bf);
5433 ath_tx_calc_duration(sc, bf);
5434 ath_tx_calc_protection(sc, bf);
5435 ath_tx_set_rtscts(sc, bf);
5436 ath_tx_rate_fill_rcflags(sc, bf);
5437 ath_tx_setds(sc, bf);
5438 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5440 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5442 /* Queue the packet; continue */
5449 * Do a rate control lookup on the first frame in the
5450 * list. The rate control code needs that to occur
5451 * before it can determine whether to TX.
5452 * It's inaccurate because the rate control code doesn't
5453 * really "do" aggregate lookups, so it only considers
5454 * the size of the first frame.
5456 ath_tx_do_ratelookup(sc, bf);
5457 bf->bf_state.bfs_rc[3].rix = 0;
5458 bf->bf_state.bfs_rc[3].tries = 0;
5460 ath_tx_calc_duration(sc, bf);
5461 ath_tx_calc_protection(sc, bf);
5463 ath_tx_set_rtscts(sc, bf);
5464 ath_tx_rate_fill_rcflags(sc, bf);
5466 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5468 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5469 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5472 * No frames to be picked up - out of BAW
5474 if (TAILQ_EMPTY(&bf_q))
5478 * This assumes that the descriptor list in the ath_bufhead
5479 * are already linked together via bf_next pointers.
5481 bf = TAILQ_FIRST(&bf_q);
5483 if (status == ATH_AGGR_8K_LIMITED)
5484 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5487 * If it's the only frame send as non-aggregate
5488 * assume that ath_tx_form_aggr() has checked
5489 * whether it's in the BAW and added it appropriately.
5491 if (bf->bf_state.bfs_nframes == 1) {
5492 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5493 "%s: single-frame aggregate\n", __func__);
5495 /* Update CLRDMASK just before this frame is queued */
5496 ath_tx_update_clrdmask(sc, tid, bf);
5498 bf->bf_state.bfs_aggr = 0;
5499 bf->bf_state.bfs_ndelim = 0;
5500 ath_tx_setds(sc, bf);
5501 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5502 if (status == ATH_AGGR_BAW_CLOSED)
5503 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5505 sc->sc_aggr_stats.aggr_single_pkt++;
5507 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5508 "%s: multi-frame aggregate: %d frames, "
5510 __func__, bf->bf_state.bfs_nframes,
5511 bf->bf_state.bfs_al);
5512 bf->bf_state.bfs_aggr = 1;
5513 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5514 sc->sc_aggr_stats.aggr_aggr_pkt++;
5516 /* Update CLRDMASK just before this frame is queued */
5517 ath_tx_update_clrdmask(sc, tid, bf);
5520 * Calculate the duration/protection as required.
5522 ath_tx_calc_duration(sc, bf);
5523 ath_tx_calc_protection(sc, bf);
5526 * Update the rate and rtscts information based on the
5527 * rate decision made by the rate control code;
5528 * the first frame in the aggregate needs it.
5530 ath_tx_set_rtscts(sc, bf);
5533 * Setup the relevant descriptor fields
5534 * for aggregation. The first descriptor
5535 * already points to the rest in the chain.
5537 ath_tx_setds_11n(sc, bf);
5541 /* Set completion handler, multi-frame aggregate or not */
5542 bf->bf_comp = ath_tx_aggr_comp;
5544 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5545 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5548 * Update leak count and frame config if were leaking frames.
5550 * XXX TODO: it should update all frames in an aggregate
5553 ath_tx_leak_count_update(sc, tid, bf);
5556 ath_tx_handoff(sc, txq, bf);
5558 /* Track outstanding buffer count to hardware */
5559 /* aggregates are "one" buffer */
5563 * Break out if ath_tx_form_aggr() indicated
5564 * there can't be any further progress (eg BAW is full.)
5565 * Checking for an empty txq is done above.
5567 * XXX locking on txq here?
5569 /* XXX TXQ locking */
5570 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5571 (status == ATH_AGGR_BAW_CLOSED ||
5572 status == ATH_AGGR_LEAK_CLOSED))
5578 * Schedule some packets from the given node/TID to the hardware.
5580 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5581 * It just dumps frames into the TXQ. We should limit how deep
5582 * the transmit queue can grow for frames dispatched to the given
5585 * To avoid locking issues, either we need to own the TXQ lock
5586 * at this point, or we need to pass in the maximum frame count
5590 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5591 struct ath_tid *tid)
5594 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5596 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5597 __func__, an, tid->tid);
5599 ATH_TX_LOCK_ASSERT(sc);
5601 /* Check - is AMPDU pending or running? then print out something */
5602 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5603 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5604 __func__, tid->tid);
5605 if (ath_tx_ampdu_running(sc, an, tid->tid))
5606 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5607 __func__, tid->tid);
5612 * If the upper layers have paused the TID, don't
5613 * queue any further packets.
5615 * XXX if we are leaking frames, make sure we decrement
5616 * that counter _and_ we continue here.
5618 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5621 bf = ATH_TID_FIRST(tid);
5626 ATH_TID_REMOVE(tid, bf, bf_list);
5629 if (tid->tid != bf->bf_state.bfs_tid) {
5630 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5631 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5634 /* Normal completion handler */
5635 bf->bf_comp = ath_tx_normal_comp;
5638 * Override this for now, until the non-aggregate
5639 * completion handler correctly handles software retransmits.
5641 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5643 /* Update CLRDMASK just before this frame is queued */
5644 ath_tx_update_clrdmask(sc, tid, bf);
5646 /* Program descriptors + rate control */
5647 ath_tx_do_ratelookup(sc, bf);
5648 ath_tx_calc_duration(sc, bf);
5649 ath_tx_calc_protection(sc, bf);
5650 ath_tx_set_rtscts(sc, bf);
5651 ath_tx_rate_fill_rcflags(sc, bf);
5652 ath_tx_setds(sc, bf);
5655 * Update the current leak count if
5656 * we're leaking frames; and set the
5657 * MORE flag as appropriate.
5659 ath_tx_leak_count_update(sc, tid, bf);
5661 /* Track outstanding buffer count to hardware */
5662 /* aggregates are "one" buffer */
5665 /* Punt to hardware or software txq */
5666 ath_tx_handoff(sc, txq, bf);
5671 * Schedule some packets to the given hardware queue.
5673 * This function walks the list of TIDs (ie, ath_node TIDs
5674 * with queued traffic) and attempts to schedule traffic
5677 * TID scheduling is implemented as a FIFO, with TIDs being
5678 * added to the end of the queue after some frames have been
5682 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5684 struct ath_tid *tid, *next, *last;
5686 ATH_TX_LOCK_ASSERT(sc);
5689 * For non-EDMA chips, aggr frames that have been built are
5690 * in axq_aggr_depth, whether they've been scheduled or not.
5691 * There's no FIFO, so txq->axq_depth is what's been scheduled
5694 * For EDMA chips, we do it in two stages. The existing code
5695 * builds a list of frames to go to the hardware and the EDMA
5696 * code turns it into a single entry to push into the FIFO.
5697 * That way we don't take up one packet per FIFO slot.
5698 * We do push one aggregate per FIFO slot though, just to keep
5701 * The FIFO depth is what's in the hardware; the txq->axq_depth
5702 * is what's been scheduled to the FIFO.
5704 * fifo.axq_depth is the number of frames (or aggregates) pushed
5705 * into the EDMA FIFO. For multi-frame lists, this is the number
5706 * of frames pushed in.
5707 * axq_fifo_depth is the number of FIFO slots currently busy.
5710 /* For EDMA and non-EDMA, check built/scheduled against aggr limit */
5711 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr) {
5712 sc->sc_aggr_stats.aggr_sched_nopkt++;
5717 * For non-EDMA chips, axq_depth is the "what's scheduled to
5718 * the hardware list". For EDMA it's "What's built for the hardware"
5719 * and fifo.axq_depth is how many frames have been dispatched
5720 * already to the hardware.
5722 if (txq->axq_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_nonaggr) {
5723 sc->sc_aggr_stats.aggr_sched_nopkt++;
5727 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5729 TAILQ_FOREACH_SAFE(tid, &txq->axq_tidq, axq_qelem, next) {
5731 * Suspend paused queues here; they'll be resumed
5732 * once the addba completes or times out.
5734 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5735 __func__, tid->tid, tid->paused);
5736 ath_tx_tid_unsched(sc, tid);
5738 * This node may be in power-save and we're leaking
5739 * a frame; be careful.
5741 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5744 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5745 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5747 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5749 /* Not empty? Re-schedule */
5750 if (tid->axq_depth != 0)
5751 ath_tx_tid_sched(sc, tid);
5754 * Give the software queue time to aggregate more
5755 * packets. If we aren't running aggregation then
5756 * we should still limit the hardware queue depth.
5758 /* XXX TXQ locking */
5759 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5762 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5767 * If this was the last entry on the original list, stop.
5768 * Otherwise nodes that have been rescheduled onto the end
5769 * of the TID FIFO list will just keep being rescheduled.
5771 * XXX What should we do about nodes that were paused
5772 * but are pending a leaking frame in response to a ps-poll?
5773 * They'll be put at the front of the list; so they'll
5774 * prematurely trigger this condition! Ew.
5786 * Return net80211 TID struct pointer, or NULL for none
5788 struct ieee80211_tx_ampdu *
5789 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5791 struct ieee80211_node *ni = &an->an_node;
5792 struct ieee80211_tx_ampdu *tap;
5794 if (tid == IEEE80211_NONQOS_TID)
5797 tap = &ni->ni_tx_ampdu[tid];
5802 * Is AMPDU-TX running?
5805 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5807 struct ieee80211_tx_ampdu *tap;
5809 if (tid == IEEE80211_NONQOS_TID)
5812 tap = ath_tx_get_tx_tid(an, tid);
5814 return 0; /* Not valid; default to not running */
5816 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5820 * Is AMPDU-TX negotiation pending?
5823 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5825 struct ieee80211_tx_ampdu *tap;
5827 if (tid == IEEE80211_NONQOS_TID)
5830 tap = ath_tx_get_tx_tid(an, tid);
5832 return 0; /* Not valid; default to not pending */
5834 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5838 * Is AMPDU-TX pending for the given TID?
5843 * Method to handle sending an ADDBA request.
5845 * We tap this so the relevant flags can be set to pause the TID
5846 * whilst waiting for the response.
5848 * XXX there's no timeout handler we can override?
5851 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5852 int dialogtoken, int baparamset, int batimeout)
5854 struct ath_softc *sc = ni->ni_ic->ic_softc;
5855 int tid = tap->txa_tid;
5856 struct ath_node *an = ATH_NODE(ni);
5857 struct ath_tid *atid = &an->an_tid[tid];
5860 * XXX danger Will Robinson!
5862 * Although the taskqueue may be running and scheduling some more
5863 * packets, these should all be _before_ the addba sequence number.
5864 * However, net80211 will keep self-assigning sequence numbers
5865 * until addba has been negotiated.
5867 * In the past, these packets would be "paused" (which still works
5868 * fine, as they're being scheduled to the driver in the same
5869 * serialised method which is calling the addba request routine)
5870 * and when the aggregation session begins, they'll be dequeued
5871 * as aggregate packets and added to the BAW. However, now there's
5872 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5873 * packets. Thus they never get included in the BAW tracking and
5874 * this can cause the initial burst of packets after the addba
5875 * negotiation to "hang", as they quickly fall outside the BAW.
5877 * The "eventual" solution should be to tag these packets with
5878 * dobaw. Although net80211 has given us a sequence number,
5879 * it'll be "after" the left edge of the BAW and thus it'll
5884 * This is a bit annoying. Until net80211 HT code inherits some
5885 * (any) locking, we may have this called in parallel BUT only
5886 * one response/timeout will be called. Grr.
5888 if (atid->addba_tx_pending == 0) {
5889 ath_tx_tid_pause(sc, atid);
5890 atid->addba_tx_pending = 1;
5894 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5895 "%s: %6D: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5899 dialogtoken, baparamset, batimeout);
5900 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5901 "%s: txa_start=%d, ni_txseqs=%d\n",
5902 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5904 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5909 * Handle an ADDBA response.
5911 * We unpause the queue so TX'ing can resume.
5913 * Any packets TX'ed from this point should be "aggregate" (whether
5914 * aggregate or not) so the BAW is updated.
5916 * Note! net80211 keeps self-assigning sequence numbers until
5917 * ampdu is negotiated. This means the initially-negotiated BAW left
5918 * edge won't match the ni->ni_txseq.
5920 * So, being very dirty, the BAW left edge is "slid" here to match
5923 * What likely SHOULD happen is that all packets subsequent to the
5924 * addba request should be tagged as aggregate and queued as non-aggregate
5925 * frames; thus updating the BAW. For now though, I'll just slide the
5929 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5930 int status, int code, int batimeout)
5932 struct ath_softc *sc = ni->ni_ic->ic_softc;
5933 int tid = tap->txa_tid;
5934 struct ath_node *an = ATH_NODE(ni);
5935 struct ath_tid *atid = &an->an_tid[tid];
5938 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5939 "%s: %6D: called; status=%d, code=%d, batimeout=%d\n", __func__,
5942 status, code, batimeout);
5944 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5945 "%s: txa_start=%d, ni_txseqs=%d\n",
5946 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5949 * Call this first, so the interface flags get updated
5950 * before the TID is unpaused. Otherwise a race condition
5951 * exists where the unpaused TID still doesn't yet have
5952 * IEEE80211_AGGR_RUNNING set.
5954 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5957 atid->addba_tx_pending = 0;
5960 * Slide the BAW left edge to wherever net80211 left it for us.
5961 * Read above for more information.
5963 tap->txa_start = ni->ni_txseqs[tid];
5964 ath_tx_tid_resume(sc, atid);
5971 * Stop ADDBA on a queue.
5973 * This can be called whilst BAR TX is currently active on the queue,
5974 * so make sure this is unblocked before continuing.
5977 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5979 struct ath_softc *sc = ni->ni_ic->ic_softc;
5980 int tid = tap->txa_tid;
5981 struct ath_node *an = ATH_NODE(ni);
5982 struct ath_tid *atid = &an->an_tid[tid];
5986 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %6D: called\n",
5992 * Pause TID traffic early, so there aren't any races
5993 * Unblock the pending BAR held traffic, if it's currently paused.
5996 ath_tx_tid_pause(sc, atid);
5997 if (atid->bar_wait) {
5999 * bar_unsuspend() expects bar_tx == 1, as it should be
6000 * called from the TX completion path. This quietens
6001 * the warning. It's cleared for us anyway.
6004 ath_tx_tid_bar_unsuspend(sc, atid);
6008 /* There's no need to hold the TXQ lock here */
6009 sc->sc_addba_stop(ni, tap);
6012 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
6013 * it'll set the cleanup flag, and it'll be unpaused once
6014 * things have been cleaned up.
6020 * In case there's a followup call to this, only call it
6021 * if we don't have a cleanup in progress.
6023 * Since we've paused the queue above, we need to make
6024 * sure we unpause if there's already a cleanup in
6025 * progress - it means something else is also doing
6026 * this stuff, so we don't need to also keep it paused.
6028 if (atid->cleanup_inprogress) {
6029 ath_tx_tid_resume(sc, atid);
6031 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
6033 * Unpause the TID if no cleanup is required.
6035 if (! atid->cleanup_inprogress)
6036 ath_tx_tid_resume(sc, atid);
6040 /* Handle completing frames and fail them */
6041 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
6042 TAILQ_REMOVE(&bf_cq, bf, bf_list);
6043 ath_tx_default_comp(sc, bf, 1);
6049 * Handle a node reassociation.
6051 * We may have a bunch of frames queued to the hardware; those need
6052 * to be marked as cleanup.
6055 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
6057 struct ath_tid *tid;
6064 ATH_TX_UNLOCK_ASSERT(sc);
6067 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
6068 tid = &an->an_tid[i];
6069 if (tid->hwq_depth == 0)
6071 DPRINTF(sc, ATH_DEBUG_NODE,
6072 "%s: %6D: TID %d: cleaning up TID\n",
6074 an->an_node.ni_macaddr,
6078 * In case there's a followup call to this, only call it
6079 * if we don't have a cleanup in progress.
6081 if (! tid->cleanup_inprogress) {
6082 ath_tx_tid_pause(sc, tid);
6083 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
6085 * Unpause the TID if no cleanup is required.
6087 if (! tid->cleanup_inprogress)
6088 ath_tx_tid_resume(sc, tid);
6093 /* Handle completing frames and fail them */
6094 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
6095 TAILQ_REMOVE(&bf_cq, bf, bf_list);
6096 ath_tx_default_comp(sc, bf, 1);
6101 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
6102 * it simply tears down the aggregation session. Ew.
6104 * It however will call ieee80211_ampdu_stop() which will call
6105 * ic->ic_addba_stop().
6107 * XXX This uses a hard-coded max BAR count value; the whole
6108 * XXX BAR TX success or failure should be better handled!
6111 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
6114 struct ath_softc *sc = ni->ni_ic->ic_softc;
6115 int tid = tap->txa_tid;
6116 struct ath_node *an = ATH_NODE(ni);
6117 struct ath_tid *atid = &an->an_tid[tid];
6118 int attempts = tap->txa_attempts;
6121 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6122 "%s: %6D: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d, txa_start=%d, txa_seqpending=%d\n",
6131 tap->txa_seqpending);
6133 /* Note: This may update the BAW details */
6135 * XXX What if this does slide the BAW along? We need to somehow
6136 * XXX either fix things when it does happen, or prevent the
6137 * XXX seqpending value to be anything other than exactly what
6138 * XXX the hell we want!
6140 * XXX So for now, how I do this inside the TX lock for now
6141 * XXX and just correct it afterwards? The below condition should
6142 * XXX never happen and if it does I need to fix all kinds of things.
6145 old_txa_start = tap->txa_start;
6146 sc->sc_bar_response(ni, tap, status);
6147 if (tap->txa_start != old_txa_start) {
6148 device_printf(sc->sc_dev, "%s: tid=%d; txa_start=%d, old=%d, adjusting\n",
6154 tap->txa_start = old_txa_start;
6157 /* Unpause the TID */
6159 * XXX if this is attempt=50, the TID will be downgraded
6160 * XXX to a non-aggregate session. So we must unpause the
6161 * XXX TID here or it'll never be done.
6163 * Also, don't call it if bar_tx/bar_wait are 0; something
6164 * has beaten us to the punch? (XXX figure out what?)
6166 if (status == 0 || attempts == 50) {
6168 if (atid->bar_tx == 0 || atid->bar_wait == 0)
6169 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6170 "%s: huh? bar_tx=%d, bar_wait=%d\n",
6172 atid->bar_tx, atid->bar_wait);
6174 ath_tx_tid_bar_unsuspend(sc, atid);
6180 * This is called whenever the pending ADDBA request times out.
6181 * Unpause and reschedule the TID.
6184 ath_addba_response_timeout(struct ieee80211_node *ni,
6185 struct ieee80211_tx_ampdu *tap)
6187 struct ath_softc *sc = ni->ni_ic->ic_softc;
6188 int tid = tap->txa_tid;
6189 struct ath_node *an = ATH_NODE(ni);
6190 struct ath_tid *atid = &an->an_tid[tid];
6192 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
6193 "%s: %6D: TID=%d, called; resuming\n",
6200 atid->addba_tx_pending = 0;
6203 /* Note: This updates the aggregate state to (again) pending */
6204 sc->sc_addba_response_timeout(ni, tap);
6206 /* Unpause the TID; which reschedules it */
6208 ath_tx_tid_resume(sc, atid);
6213 * Check if a node is asleep or not.
6216 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
6219 ATH_TX_LOCK_ASSERT(sc);
6221 return (an->an_is_powersave);
6225 * Mark a node as currently "in powersaving."
6226 * This suspends all traffic on the node.
6228 * This must be called with the node/tx locks free.
6230 * XXX TODO: the locking silliness below is due to how the node
6231 * locking currently works. Right now, the node lock is grabbed
6232 * to do rate control lookups and these are done with the TX
6233 * queue lock held. This means the node lock can't be grabbed
6234 * first here or a LOR will occur.
6236 * Eventually (hopefully!) the TX path code will only grab
6237 * the TXQ lock when transmitting and the ath_node lock when
6238 * doing node/TID operations. There are other complications -
6239 * the sched/unsched operations involve walking the per-txq
6240 * 'active tid' list and this requires both locks to be held.
6243 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
6245 struct ath_tid *atid;
6246 struct ath_txq *txq;
6249 ATH_TX_UNLOCK_ASSERT(sc);
6251 /* Suspend all traffic on the node */
6254 if (an->an_is_powersave) {
6255 DPRINTF(sc, ATH_DEBUG_XMIT,
6256 "%s: %6D: node was already asleep!\n",
6257 __func__, an->an_node.ni_macaddr, ":");
6262 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6263 atid = &an->an_tid[tid];
6264 txq = sc->sc_ac2q[atid->ac];
6266 ath_tx_tid_pause(sc, atid);
6269 /* Mark node as in powersaving */
6270 an->an_is_powersave = 1;
6276 * Mark a node as currently "awake."
6277 * This resumes all traffic to the node.
6280 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
6282 struct ath_tid *atid;
6283 struct ath_txq *txq;
6286 ATH_TX_UNLOCK_ASSERT(sc);
6291 if (an->an_is_powersave == 0) {
6293 DPRINTF(sc, ATH_DEBUG_XMIT,
6294 "%s: an=%p: node was already awake\n",
6299 /* Mark node as awake */
6300 an->an_is_powersave = 0;
6302 * Clear any pending leaked frame requests
6304 an->an_leak_count = 0;
6306 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6307 atid = &an->an_tid[tid];
6308 txq = sc->sc_ac2q[atid->ac];
6310 ath_tx_tid_resume(sc, atid);
6316 ath_legacy_dma_txsetup(struct ath_softc *sc)
6319 /* nothing new needed */
6324 ath_legacy_dma_txteardown(struct ath_softc *sc)
6327 /* nothing new needed */
6332 ath_xmit_setup_legacy(struct ath_softc *sc)
6335 * For now, just set the descriptor length to sizeof(ath_desc);
6336 * worry about extracting the real length out of the HAL later.
6338 sc->sc_tx_desclen = sizeof(struct ath_desc);
6339 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6340 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6342 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6343 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6344 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6346 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6347 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6349 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;