2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
3 * Copyright (c) 2010-2012 Adrian Chadd, Xenion Pty Ltd
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer,
11 * without modification.
12 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
13 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
14 * redistribution must be conditioned upon including a substantially
15 * similar Disclaimer requirement for further binary redistribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
23 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
26 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGES.
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 * Driver for the Atheros Wireless LAN controller.
37 * This software is derived from work of Atsushi Onoe; his contribution
38 * is greatly appreciated.
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/sysctl.h>
49 #include <sys/malloc.h>
51 #include <sys/mutex.h>
52 #include <sys/kernel.h>
53 #include <sys/socket.h>
54 #include <sys/sockio.h>
55 #include <sys/errno.h>
56 #include <sys/callout.h>
58 #include <sys/endian.h>
59 #include <sys/kthread.h>
60 #include <sys/taskqueue.h>
64 #include <machine/bus.h>
67 #include <net/if_var.h>
68 #include <net/if_dl.h>
69 #include <net/if_media.h>
70 #include <net/if_types.h>
71 #include <net/if_arp.h>
72 #include <net/ethernet.h>
73 #include <net/if_llc.h>
75 #include <net80211/ieee80211_var.h>
76 #include <net80211/ieee80211_regdomain.h>
77 #ifdef IEEE80211_SUPPORT_SUPERG
78 #include <net80211/ieee80211_superg.h>
80 #ifdef IEEE80211_SUPPORT_TDMA
81 #include <net80211/ieee80211_tdma.h>
83 #include <net80211/ieee80211_ht.h>
88 #include <netinet/in.h>
89 #include <netinet/if_ether.h>
92 #include <dev/ath/if_athvar.h>
93 #include <dev/ath/ath_hal/ah_devid.h> /* XXX for softled */
94 #include <dev/ath/ath_hal/ah_diagcodes.h>
96 #include <dev/ath/if_ath_debug.h>
99 #include <dev/ath/ath_tx99/ath_tx99.h>
102 #include <dev/ath/if_ath_misc.h>
103 #include <dev/ath/if_ath_tx.h>
104 #include <dev/ath/if_ath_tx_ht.h>
107 #include <dev/ath/if_ath_alq.h>
111 * How many retries to perform in software
113 #define SWMAX_RETRIES 10
116 * What queue to throw the non-QoS TID traffic into
118 #define ATH_NONQOS_TID_AC WME_AC_VO
121 static int ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an);
123 static int ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an,
125 static int ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an,
127 static ieee80211_seq ath_tx_tid_seqno_assign(struct ath_softc *sc,
128 struct ieee80211_node *ni, struct ath_buf *bf, struct mbuf *m0);
129 static int ath_tx_action_frame_override_queue(struct ath_softc *sc,
130 struct ieee80211_node *ni, struct mbuf *m0, int *tid);
131 static struct ath_buf *
132 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
133 struct ath_tid *tid, struct ath_buf *bf);
137 ath_tx_alq_post(struct ath_softc *sc, struct ath_buf *bf_first)
143 /* XXX we should skip out early if debugging isn't enabled! */
147 /* XXX should ensure bf_nseg > 0! */
148 if (bf->bf_nseg == 0)
150 n = ((bf->bf_nseg - 1) / sc->sc_tx_nmaps) + 1;
151 for (i = 0, ds = (const char *) bf->bf_desc;
153 i++, ds += sc->sc_tx_desclen) {
154 if_ath_alq_post(&sc->sc_alq,
162 #endif /* ATH_DEBUG_ALQ */
165 * Whether to use the 11n rate scenario functions or not
168 ath_tx_is_11n(struct ath_softc *sc)
170 return ((sc->sc_ah->ah_magic == 0x20065416) ||
171 (sc->sc_ah->ah_magic == 0x19741014));
175 * Obtain the current TID from the given frame.
177 * Non-QoS frames get mapped to a TID so frames consistently
178 * go on a sensible queue.
181 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
183 const struct ieee80211_frame *wh;
185 wh = mtod(m0, const struct ieee80211_frame *);
187 /* Non-QoS: map frame to a TID queue for software queueing */
188 if (! IEEE80211_QOS_HAS_SEQ(wh))
189 return (WME_AC_TO_TID(M_WME_GETAC(m0)));
191 /* QoS - fetch the TID from the header, ignore mbuf WME */
192 return (ieee80211_gettid(wh));
196 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
198 struct ieee80211_frame *wh;
200 wh = mtod(bf->bf_m, struct ieee80211_frame *);
201 /* Only update/resync if needed */
202 if (bf->bf_state.bfs_isretried == 0) {
203 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
204 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
205 BUS_DMASYNC_PREWRITE);
207 bf->bf_state.bfs_isretried = 1;
208 bf->bf_state.bfs_retries ++;
212 * Determine what the correct AC queue for the given frame
215 * For QoS frames, obey the TID. That way things like
216 * management frames that are related to a given TID
217 * are thus serialised with the rest of the TID traffic,
218 * regardless of net80211 overriding priority.
220 * For non-QoS frames, return the mbuf WMI priority.
222 * This has implications that higher priority non-QoS traffic
223 * may end up being scheduled before other non-QoS traffic,
224 * leading to out-of-sequence packets being emitted.
226 * (It'd be nice to log/count this so we can see if it
227 * really is a problem.)
229 * TODO: maybe we should throw multicast traffic, QoS or
230 * otherwise, into a separate TX queue?
233 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
235 const struct ieee80211_frame *wh;
237 wh = mtod(m0, const struct ieee80211_frame *);
240 * QoS data frame (sequence number or otherwise) -
241 * return hardware queue mapping for the underlying
244 if (IEEE80211_QOS_HAS_SEQ(wh))
245 return TID_TO_WME_AC(ieee80211_gettid(wh));
248 * Otherwise - return mbuf QoS pri.
250 return (M_WME_GETAC(m0));
254 ath_txfrag_cleanup(struct ath_softc *sc,
255 ath_bufhead *frags, struct ieee80211_node *ni)
257 struct ath_buf *bf, *next;
259 ATH_TXBUF_LOCK_ASSERT(sc);
261 TAILQ_FOREACH_SAFE(bf, frags, bf_list, next) {
262 /* NB: bf assumed clean */
263 TAILQ_REMOVE(frags, bf, bf_list);
264 ath_returnbuf_head(sc, bf);
265 ieee80211_node_decref(ni);
270 * Setup xmit of a fragmented frame. Allocate a buffer
271 * for each frag and bump the node reference count to
272 * reflect the held reference to be setup by ath_tx_start.
275 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
276 struct mbuf *m0, struct ieee80211_node *ni)
282 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
283 /* XXX non-management? */
284 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
285 if (bf == NULL) { /* out of buffers, cleanup */
286 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
288 ath_txfrag_cleanup(sc, frags, ni);
291 ieee80211_node_incref(ni);
292 TAILQ_INSERT_TAIL(frags, bf, bf_list);
294 ATH_TXBUF_UNLOCK(sc);
296 return !TAILQ_EMPTY(frags);
300 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
306 * Load the DMA map so any coalescing is done. This
307 * also calculates the number of descriptors we need.
309 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
310 bf->bf_segs, &bf->bf_nseg,
312 if (error == EFBIG) {
313 /* XXX packet requires too many descriptors */
314 bf->bf_nseg = ATH_MAX_SCATTER + 1;
315 } else if (error != 0) {
316 sc->sc_stats.ast_tx_busdma++;
317 ieee80211_free_mbuf(m0);
321 * Discard null packets and check for packets that
322 * require too many TX descriptors. We try to convert
323 * the latter to a cluster.
325 if (bf->bf_nseg > ATH_MAX_SCATTER) { /* too many desc's, linearize */
326 sc->sc_stats.ast_tx_linear++;
327 m = m_collapse(m0, M_NOWAIT, ATH_MAX_SCATTER);
329 ieee80211_free_mbuf(m0);
330 sc->sc_stats.ast_tx_nombuf++;
334 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
335 bf->bf_segs, &bf->bf_nseg,
338 sc->sc_stats.ast_tx_busdma++;
339 ieee80211_free_mbuf(m0);
342 KASSERT(bf->bf_nseg <= ATH_MAX_SCATTER,
343 ("too many segments after defrag; nseg %u", bf->bf_nseg));
344 } else if (bf->bf_nseg == 0) { /* null packet, discard */
345 sc->sc_stats.ast_tx_nodata++;
346 ieee80211_free_mbuf(m0);
349 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
350 __func__, m0, m0->m_pkthdr.len);
351 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
358 * Chain together segments+descriptors for a frame - 11n or otherwise.
360 * For aggregates, this is called on each frame in the aggregate.
363 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
364 struct ath_buf *bf, int is_aggr, int is_first_subframe,
365 int is_last_subframe)
367 struct ath_hal *ah = sc->sc_ah;
370 HAL_DMA_ADDR bufAddrList[4];
371 uint32_t segLenList[4];
376 * XXX There's txdma and txdma_mgmt; the descriptor
379 struct ath_descdma *dd = &sc->sc_txdma;
382 * Fillin the remainder of the descriptor info.
386 * We need the number of TX data pointers in each descriptor.
387 * EDMA and later chips support 4 TX buffers per descriptor;
388 * previous chips just support one.
390 numTxMaps = sc->sc_tx_nmaps;
393 * For EDMA and later chips ensure the TX map is fully populated
394 * before advancing to the next descriptor.
396 ds = (char *) bf->bf_desc;
398 bzero(bufAddrList, sizeof(bufAddrList));
399 bzero(segLenList, sizeof(segLenList));
400 for (i = 0; i < bf->bf_nseg; i++) {
401 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
402 segLenList[bp] = bf->bf_segs[i].ds_len;
406 * Go to the next segment if this isn't the last segment
407 * and there's space in the current TX map.
409 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
413 * Last segment or we're out of buffer pointers.
417 if (i == bf->bf_nseg - 1)
418 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
420 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
421 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
424 * XXX This assumes that bfs_txq is the actual destination
425 * hardware queue at this point. It may not have been
426 * assigned, it may actually be pointing to the multicast
427 * software TXQ id. These must be fixed!
429 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
432 , bf->bf_descid /* XXX desc id */
433 , bf->bf_state.bfs_tx_queue
434 , isFirstDesc /* first segment */
435 , i == bf->bf_nseg - 1 /* last segment */
436 , (struct ath_desc *) ds0 /* first descriptor */
440 * Make sure the 11n aggregate fields are cleared.
442 * XXX TODO: this doesn't need to be called for
443 * aggregate frames; as it'll be called on all
444 * sub-frames. Since the descriptors are in
445 * non-cacheable memory, this leads to some
446 * rather slow writes on MIPS/ARM platforms.
448 if (ath_tx_is_11n(sc))
449 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
452 * If 11n is enabled, set it up as if it's an aggregate
455 if (is_last_subframe) {
456 ath_hal_set11n_aggr_last(sc->sc_ah,
457 (struct ath_desc *) ds);
458 } else if (is_aggr) {
460 * This clears the aggrlen field; so
461 * the caller needs to call set_aggr_first()!
463 * XXX TODO: don't call this for the first
464 * descriptor in the first frame in an
467 ath_hal_set11n_aggr_middle(sc->sc_ah,
468 (struct ath_desc *) ds,
469 bf->bf_state.bfs_ndelim);
472 bf->bf_lastds = (struct ath_desc *) ds;
475 * Don't forget to skip to the next descriptor.
477 ds += sc->sc_tx_desclen;
481 * .. and don't forget to blank these out!
483 bzero(bufAddrList, sizeof(bufAddrList));
484 bzero(segLenList, sizeof(segLenList));
486 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
490 * Set the rate control fields in the given descriptor based on
491 * the bf_state fields and node state.
493 * The bfs fields should already be set with the relevant rate
494 * control information, including whether MRR is to be enabled.
496 * Since the FreeBSD HAL currently sets up the first TX rate
497 * in ath_hal_setuptxdesc(), this will setup the MRR
498 * conditionally for the pre-11n chips, and call ath_buf_set_rate
499 * unconditionally for 11n chips. These require the 11n rate
500 * scenario to be set if MCS rates are enabled, so it's easier
501 * to just always call it. The caller can then only set rates 2, 3
502 * and 4 if multi-rate retry is needed.
505 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
508 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
510 /* If mrr is disabled, blank tries 1, 2, 3 */
511 if (! bf->bf_state.bfs_ismrr)
512 rc[1].tries = rc[2].tries = rc[3].tries = 0;
516 * If NOACK is set, just set ntries=1.
518 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
519 rc[1].tries = rc[2].tries = rc[3].tries = 0;
525 * Always call - that way a retried descriptor will
526 * have the MRR fields overwritten.
528 * XXX TODO: see if this is really needed - setting up
529 * the first descriptor should set the MRR fields to 0
532 if (ath_tx_is_11n(sc)) {
533 ath_buf_set_rate(sc, ni, bf);
535 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
536 , rc[1].ratecode, rc[1].tries
537 , rc[2].ratecode, rc[2].tries
538 , rc[3].ratecode, rc[3].tries
544 * Setup segments+descriptors for an 11n aggregate.
545 * bf_first is the first buffer in the aggregate.
546 * The descriptor list must already been linked together using
550 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
552 struct ath_buf *bf, *bf_prev = NULL;
553 struct ath_desc *ds0 = bf_first->bf_desc;
555 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
556 __func__, bf_first->bf_state.bfs_nframes,
557 bf_first->bf_state.bfs_al);
561 if (bf->bf_state.bfs_txrate0 == 0)
562 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
564 if (bf->bf_state.bfs_rc[0].ratecode == 0)
565 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
569 * Setup all descriptors of all subframes - this will
570 * call ath_hal_set11naggrmiddle() on every frame.
573 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
574 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
575 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
576 SEQNO(bf->bf_state.bfs_seqno));
579 * Setup the initial fields for the first descriptor - all
580 * the non-11n specific stuff.
582 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
583 , bf->bf_state.bfs_pktlen /* packet length */
584 , bf->bf_state.bfs_hdrlen /* header length */
585 , bf->bf_state.bfs_atype /* Atheros packet type */
586 , bf->bf_state.bfs_txpower /* txpower */
587 , bf->bf_state.bfs_txrate0
588 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
589 , bf->bf_state.bfs_keyix /* key cache index */
590 , bf->bf_state.bfs_txantenna /* antenna mode */
591 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
592 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
593 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
597 * First descriptor? Setup the rate control and initial
598 * aggregate header information.
600 if (bf == bf_first) {
602 * setup first desc with rate and aggr info
604 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
608 * Setup the descriptors for a multi-descriptor frame.
609 * This is both aggregate and non-aggregate aware.
611 ath_tx_chaindesclist(sc, ds0, bf,
613 !! (bf == bf_first), /* is_first_subframe */
614 !! (bf->bf_next == NULL) /* is_last_subframe */
617 if (bf == bf_first) {
619 * Initialise the first 11n aggregate with the
620 * aggregate length and aggregate enable bits.
622 ath_hal_set11n_aggr_first(sc->sc_ah,
625 bf->bf_state.bfs_ndelim);
629 * Link the last descriptor of the previous frame
630 * to the beginning descriptor of this frame.
633 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
636 /* Save a copy so we can link the next descriptor in */
642 * Set the first descriptor bf_lastds field to point to
643 * the last descriptor in the last subframe, that's where
644 * the status update will occur.
646 bf_first->bf_lastds = bf_prev->bf_lastds;
649 * And bf_last in the first descriptor points to the end of
650 * the aggregate list.
652 bf_first->bf_last = bf_prev;
655 * For non-AR9300 NICs, which require the rate control
656 * in the final descriptor - let's set that up now.
658 * This is because the filltxdesc() HAL call doesn't
659 * populate the last segment with rate control information
660 * if firstSeg is also true. For non-aggregate frames
661 * that is fine, as the first frame already has rate control
662 * info. But if the last frame in an aggregate has one
663 * descriptor, both firstseg and lastseg will be true and
664 * the rate info isn't copied.
666 * This is inefficient on MIPS/ARM platforms that have
667 * non-cachable memory for TX descriptors, but we'll just
670 * As to why the rate table is stashed in the last descriptor
671 * rather than the first descriptor? Because proctxdesc()
672 * is called on the final descriptor in an MPDU or A-MPDU -
673 * ie, the one that gets updated by the hardware upon
674 * completion. That way proctxdesc() doesn't need to know
675 * about the first _and_ last TX descriptor.
677 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
679 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
683 * Hand-off a frame to the multicast TX queue.
685 * This is a software TXQ which will be appended to the CAB queue
686 * during the beacon setup code.
688 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
689 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
690 * with the actual hardware txq, or all of this will fall apart.
692 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
693 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
697 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
700 ATH_TX_LOCK_ASSERT(sc);
702 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
703 ("%s: busy status 0x%x", __func__, bf->bf_flags));
706 * Ensure that the tx queue is the cabq, so things get
709 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
710 DPRINTF(sc, ATH_DEBUG_XMIT,
711 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
712 __func__, bf, bf->bf_state.bfs_tx_queue,
717 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
718 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
719 struct ieee80211_frame *wh;
721 /* mark previous frame */
722 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
723 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
724 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
725 BUS_DMASYNC_PREWRITE);
727 /* link descriptor */
728 ath_hal_settxdesclink(sc->sc_ah,
732 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
737 * Hand-off packet to a hardware queue.
740 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
743 struct ath_hal *ah = sc->sc_ah;
744 struct ath_buf *bf_first;
747 * Insert the frame on the outbound list and pass it on
748 * to the hardware. Multicast frames buffered for power
749 * save stations and transmit from the CAB queue are stored
750 * on a s/w only queue and loaded on to the CAB queue in
751 * the SWBA handler since frames only go out on DTIM and
752 * to avoid possible races.
754 ATH_TX_LOCK_ASSERT(sc);
755 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
756 ("%s: busy status 0x%x", __func__, bf->bf_flags));
757 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
758 ("ath_tx_handoff_hw called for mcast queue"));
761 * XXX We should instead just verify that sc_txstart_cnt
762 * or ath_txproc_cnt > 0. That would mean that
763 * the reset is going to be waiting for us to complete.
765 if (sc->sc_txproc_cnt == 0 && sc->sc_txstart_cnt == 0) {
766 device_printf(sc->sc_dev,
767 "%s: TX dispatch without holding txcount/txstart refcnt!\n",
772 * XXX .. this is going to cause the hardware to get upset;
773 * so we really should find some way to drop or queue
780 * XXX TODO: if there's a holdingbf, then
781 * ATH_TXQ_PUTRUNNING should be clear.
783 * If there is a holdingbf and the list is empty,
784 * then axq_link should be pointing to the holdingbf.
786 * Otherwise it should point to the last descriptor
787 * in the last ath_buf.
789 * In any case, we should really ensure that we
790 * update the previous descriptor link pointer to
791 * this descriptor, regardless of all of the above state.
793 * For now this is captured by having axq_link point
794 * to either the holdingbf (if the TXQ list is empty)
795 * or the end of the list (if the TXQ list isn't empty.)
796 * I'd rather just kill axq_link here and do it as above.
800 * Append the frame to the TX queue.
802 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
803 ATH_KTR(sc, ATH_KTR_TX, 3,
804 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
811 * If there's a link pointer, update it.
813 * XXX we should replace this with the above logic, just
814 * to kill axq_link with fire.
816 if (txq->axq_link != NULL) {
817 *txq->axq_link = bf->bf_daddr;
818 DPRINTF(sc, ATH_DEBUG_XMIT,
819 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
820 txq->axq_qnum, txq->axq_link,
821 (caddr_t)bf->bf_daddr, bf->bf_desc,
823 ATH_KTR(sc, ATH_KTR_TX, 5,
824 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
826 txq->axq_qnum, txq->axq_link,
827 (caddr_t)bf->bf_daddr, bf->bf_desc,
832 * If we've not pushed anything into the hardware yet,
833 * push the head of the queue into the TxDP.
835 * Once we've started DMA, there's no guarantee that
836 * updating the TxDP with a new value will actually work.
837 * So we just don't do that - if we hit the end of the list,
838 * we keep that buffer around (the "holding buffer") and
839 * re-start DMA by updating the link pointer of _that_
840 * descriptor and then restart DMA.
842 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
843 bf_first = TAILQ_FIRST(&txq->axq_q);
844 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
845 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
846 DPRINTF(sc, ATH_DEBUG_XMIT,
847 "%s: TXDP[%u] = %p (%p) depth %d\n",
848 __func__, txq->axq_qnum,
849 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
851 ATH_KTR(sc, ATH_KTR_TX, 5,
852 "ath_tx_handoff: TXDP[%u] = %p (%p) "
853 "lastds=%p depth %d",
855 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
861 * Ensure that the bf TXQ matches this TXQ, so later
862 * checking and holding buffer manipulation is sane.
864 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
865 DPRINTF(sc, ATH_DEBUG_XMIT,
866 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
867 __func__, bf, bf->bf_state.bfs_tx_queue,
872 * Track aggregate queue depth.
874 if (bf->bf_state.bfs_aggr)
875 txq->axq_aggr_depth++;
878 * Update the link pointer.
880 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
885 * If we wrote a TxDP above, DMA will start from here.
887 * If DMA is running, it'll do nothing.
889 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
890 * or VEOL) then it stops at the last transmitted write.
891 * We then append a new frame by updating the link pointer
892 * in that descriptor and then kick TxE here; it will re-read
893 * that last descriptor and find the new descriptor to transmit.
895 * This is why we keep the holding descriptor around.
897 ath_hal_txstart(ah, txq->axq_qnum);
899 ATH_KTR(sc, ATH_KTR_TX, 1,
900 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
904 * Restart TX DMA for the given TXQ.
906 * This must be called whether the queue is empty or not.
909 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
911 struct ath_buf *bf, *bf_last;
913 ATH_TXQ_LOCK_ASSERT(txq);
915 /* XXX make this ATH_TXQ_FIRST */
916 bf = TAILQ_FIRST(&txq->axq_q);
917 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
922 DPRINTF(sc, ATH_DEBUG_RESET,
923 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
928 (uint32_t) bf->bf_daddr);
931 if (sc->sc_debug & ATH_DEBUG_RESET)
932 ath_tx_dump(sc, txq);
936 * This is called from a restart, so DMA is known to be
937 * completely stopped.
939 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
940 ("%s: Q%d: called with PUTRUNNING=1\n",
944 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
945 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
947 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
949 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
953 * Hand off a packet to the hardware (or mcast queue.)
955 * The relevant hardware txq should be locked.
958 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
961 ATH_TX_LOCK_ASSERT(sc);
964 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
965 ath_tx_alq_post(sc, bf);
968 if (txq->axq_qnum == ATH_TXQ_SWQ)
969 ath_tx_handoff_mcast(sc, txq, bf);
971 ath_tx_handoff_hw(sc, txq, bf);
975 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
976 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
979 DPRINTF(sc, ATH_DEBUG_XMIT,
980 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
989 const struct ieee80211_cipher *cip;
990 struct ieee80211_key *k;
993 * Construct the 802.11 header+trailer for an encrypted
994 * frame. The only reason this can fail is because of an
995 * unknown or unsupported cipher/key type.
997 k = ieee80211_crypto_encap(ni, m0);
1000 * This can happen when the key is yanked after the
1001 * frame was queued. Just discard the frame; the
1002 * 802.11 layer counts failures and provides
1003 * debugging/diagnostics.
1008 * Adjust the packet + header lengths for the crypto
1009 * additions and calculate the h/w key index. When
1010 * a s/w mic is done the frame will have had any mic
1011 * added to it prior to entry so m0->m_pkthdr.len will
1012 * account for it. Otherwise we need to add it to the
1016 (*hdrlen) += cip->ic_header;
1017 (*pktlen) += cip->ic_header + cip->ic_trailer;
1018 /* NB: frags always have any TKIP MIC done in s/w */
1019 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1020 (*pktlen) += cip->ic_miclen;
1021 (*keyix) = k->wk_keyix;
1022 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1024 * Use station key cache slot, if assigned.
1026 (*keyix) = ni->ni_ucastkey.wk_keyix;
1027 if ((*keyix) == IEEE80211_KEYIX_NONE)
1028 (*keyix) = HAL_TXKEYIX_INVALID;
1030 (*keyix) = HAL_TXKEYIX_INVALID;
1036 * Calculate whether interoperability protection is required for
1039 * This requires the rate control information be filled in,
1040 * as the protection requirement depends upon the current
1041 * operating mode / PHY.
1044 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1046 struct ieee80211_frame *wh;
1050 const HAL_RATE_TABLE *rt = sc->sc_currates;
1051 struct ieee80211com *ic = &sc->sc_ic;
1053 flags = bf->bf_state.bfs_txflags;
1054 rix = bf->bf_state.bfs_rc[0].rix;
1055 shortPreamble = bf->bf_state.bfs_shpream;
1056 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1058 /* Disable frame protection for TOA probe frames */
1059 if (bf->bf_flags & ATH_BUF_TOA_PROBE) {
1061 flags &= ~(HAL_TXDESC_CTSENA | HAL_TXDESC_RTSENA);
1062 bf->bf_state.bfs_doprot = 0;
1067 * If 802.11g protection is enabled, determine whether
1068 * to use RTS/CTS or just CTS. Note that this is only
1069 * done for OFDM unicast frames.
1071 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1072 rt->info[rix].phy == IEEE80211_T_OFDM &&
1073 (flags & HAL_TXDESC_NOACK) == 0) {
1074 bf->bf_state.bfs_doprot = 1;
1075 /* XXX fragments must use CCK rates w/ protection */
1076 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1077 flags |= HAL_TXDESC_RTSENA;
1078 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1079 flags |= HAL_TXDESC_CTSENA;
1082 * For frags it would be desirable to use the
1083 * highest CCK rate for RTS/CTS. But stations
1084 * farther away may detect it at a lower CCK rate
1085 * so use the configured protection rate instead
1088 sc->sc_stats.ast_tx_protect++;
1092 * If 11n protection is enabled and it's a HT frame,
1095 * XXX ic_htprotmode or ic_curhtprotmode?
1096 * XXX should it_htprotmode only matter if ic_curhtprotmode
1097 * XXX indicates it's not a HT pure environment?
1099 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1100 rt->info[rix].phy == IEEE80211_T_HT &&
1101 (flags & HAL_TXDESC_NOACK) == 0) {
1102 flags |= HAL_TXDESC_RTSENA;
1103 sc->sc_stats.ast_tx_htprotect++;
1107 bf->bf_state.bfs_txflags = flags;
1111 * Update the frame duration given the currently selected rate.
1113 * This also updates the frame duration value, so it will require
1117 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1119 struct ieee80211_frame *wh;
1123 struct ath_hal *ah = sc->sc_ah;
1124 const HAL_RATE_TABLE *rt = sc->sc_currates;
1125 int isfrag = bf->bf_m->m_flags & M_FRAG;
1127 flags = bf->bf_state.bfs_txflags;
1128 rix = bf->bf_state.bfs_rc[0].rix;
1129 shortPreamble = bf->bf_state.bfs_shpream;
1130 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1133 * Calculate duration. This logically belongs in the 802.11
1134 * layer but it lacks sufficient information to calculate it.
1136 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1137 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1140 dur = rt->info[rix].spAckDuration;
1142 dur = rt->info[rix].lpAckDuration;
1143 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1144 dur += dur; /* additional SIFS+ACK */
1146 * Include the size of next fragment so NAV is
1147 * updated properly. The last fragment uses only
1150 * XXX TODO: ensure that the rate lookup for each
1151 * fragment is the same as the rate used by the
1154 dur += ath_hal_computetxtime(ah,
1162 * Force hardware to use computed duration for next
1163 * fragment by disabling multi-rate retry which updates
1164 * duration based on the multi-rate duration table.
1166 bf->bf_state.bfs_ismrr = 0;
1167 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1168 /* XXX update bfs_rc[0].try? */
1171 /* Update the duration field itself */
1172 *(u_int16_t *)wh->i_dur = htole16(dur);
1177 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1178 int cix, int shortPreamble)
1183 * CTS transmit rate is derived from the transmit rate
1184 * by looking in the h/w rate table. We must also factor
1185 * in whether or not a short preamble is to be used.
1187 /* NB: cix is set above where RTS/CTS is enabled */
1188 KASSERT(cix != 0xff, ("cix not setup"));
1189 ctsrate = rt->info[cix].rateCode;
1191 /* XXX this should only matter for legacy rates */
1193 ctsrate |= rt->info[cix].shortPreamble;
1199 * Calculate the RTS/CTS duration for legacy frames.
1202 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1203 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1206 int ctsduration = 0;
1208 /* This mustn't be called for HT modes */
1209 if (rt->info[cix].phy == IEEE80211_T_HT) {
1210 printf("%s: HT rate where it shouldn't be (0x%x)\n",
1211 __func__, rt->info[cix].rateCode);
1216 * Compute the transmit duration based on the frame
1217 * size and the size of an ACK frame. We call into the
1218 * HAL to do the computation since it depends on the
1219 * characteristics of the actual PHY being used.
1221 * NB: CTS is assumed the same size as an ACK so we can
1222 * use the precalculated ACK durations.
1224 if (shortPreamble) {
1225 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1226 ctsduration += rt->info[cix].spAckDuration;
1227 ctsduration += ath_hal_computetxtime(ah,
1228 rt, pktlen, rix, AH_TRUE, AH_TRUE);
1229 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1230 ctsduration += rt->info[rix].spAckDuration;
1232 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1233 ctsduration += rt->info[cix].lpAckDuration;
1234 ctsduration += ath_hal_computetxtime(ah,
1235 rt, pktlen, rix, AH_FALSE, AH_TRUE);
1236 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1237 ctsduration += rt->info[rix].lpAckDuration;
1240 return (ctsduration);
1244 * Update the given ath_buf with updated rts/cts setup and duration
1247 * To support rate lookups for each software retry, the rts/cts rate
1248 * and cts duration must be re-calculated.
1250 * This function assumes the RTS/CTS flags have been set as needed;
1251 * mrr has been disabled; and the rate control lookup has been done.
1253 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1254 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1257 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1259 uint16_t ctsduration = 0;
1260 uint8_t ctsrate = 0;
1261 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1263 const HAL_RATE_TABLE *rt = sc->sc_currates;
1266 * No RTS/CTS enabled? Don't bother.
1268 if ((bf->bf_state.bfs_txflags &
1269 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1270 /* XXX is this really needed? */
1271 bf->bf_state.bfs_ctsrate = 0;
1272 bf->bf_state.bfs_ctsduration = 0;
1277 * If protection is enabled, use the protection rix control
1278 * rate. Otherwise use the rate0 control rate.
1280 if (bf->bf_state.bfs_doprot)
1281 rix = sc->sc_protrix;
1283 rix = bf->bf_state.bfs_rc[0].rix;
1286 * If the raw path has hard-coded ctsrate0 to something,
1289 if (bf->bf_state.bfs_ctsrate0 != 0)
1290 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1292 /* Control rate from above */
1293 cix = rt->info[rix].controlRate;
1295 /* Calculate the rtscts rate for the given cix */
1296 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1297 bf->bf_state.bfs_shpream);
1299 /* The 11n chipsets do ctsduration calculations for you */
1300 if (! ath_tx_is_11n(sc))
1301 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1302 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1303 rt, bf->bf_state.bfs_txflags);
1305 /* Squirrel away in ath_buf */
1306 bf->bf_state.bfs_ctsrate = ctsrate;
1307 bf->bf_state.bfs_ctsduration = ctsduration;
1310 * Must disable multi-rate retry when using RTS/CTS.
1312 if (!sc->sc_mrrprot) {
1313 bf->bf_state.bfs_ismrr = 0;
1314 bf->bf_state.bfs_try0 =
1315 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1320 * Setup the descriptor chain for a normal or fast-frame
1323 * XXX TODO: extend to include the destination hardware QCU ID.
1324 * Make sure that is correct. Make sure that when being added
1325 * to the mcastq, the CABQ QCUID is set or things will get a bit
1329 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1331 struct ath_desc *ds = bf->bf_desc;
1332 struct ath_hal *ah = sc->sc_ah;
1334 if (bf->bf_state.bfs_txrate0 == 0)
1335 DPRINTF(sc, ATH_DEBUG_XMIT,
1336 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1338 ath_hal_setuptxdesc(ah, ds
1339 , bf->bf_state.bfs_pktlen /* packet length */
1340 , bf->bf_state.bfs_hdrlen /* header length */
1341 , bf->bf_state.bfs_atype /* Atheros packet type */
1342 , bf->bf_state.bfs_txpower /* txpower */
1343 , bf->bf_state.bfs_txrate0
1344 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1345 , bf->bf_state.bfs_keyix /* key cache index */
1346 , bf->bf_state.bfs_txantenna /* antenna mode */
1347 , bf->bf_state.bfs_txflags /* flags */
1348 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1349 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1353 * This will be overriden when the descriptor chain is written.
1358 /* Set rate control and descriptor chain for this frame */
1359 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1360 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1366 * This performs a rate lookup for the given ath_buf only if it's required.
1367 * Non-data frames and raw frames don't require it.
1369 * This populates the primary and MRR entries; MRR values are
1370 * then disabled later on if something requires it (eg RTS/CTS on
1373 * This needs to be done before the RTS/CTS fields are calculated
1374 * as they may depend upon the rate chosen.
1377 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1382 if (! bf->bf_state.bfs_doratelookup)
1385 /* Get rid of any previous state */
1386 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1388 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1389 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1390 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1392 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1393 bf->bf_state.bfs_rc[0].rix = rix;
1394 bf->bf_state.bfs_rc[0].ratecode = rate;
1395 bf->bf_state.bfs_rc[0].tries = try0;
1397 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1398 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1399 bf->bf_state.bfs_rc);
1400 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1402 sc->sc_txrix = rix; /* for LED blinking */
1403 sc->sc_lastdatarix = rix; /* for fast frames */
1404 bf->bf_state.bfs_try0 = try0;
1405 bf->bf_state.bfs_txrate0 = rate;
1409 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1412 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1415 struct ath_node *an = ATH_NODE(bf->bf_node);
1417 ATH_TX_LOCK_ASSERT(sc);
1419 if (an->clrdmask == 1) {
1420 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1426 * Return whether this frame should be software queued or
1427 * direct dispatched.
1429 * When doing powersave, BAR frames should be queued but other management
1430 * frames should be directly sent.
1432 * When not doing powersave, stick BAR frames into the hardware queue
1433 * so it goes out even though the queue is paused.
1435 * For now, management frames are also software queued by default.
1438 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1439 struct mbuf *m0, int *queue_to_head)
1441 struct ieee80211_node *ni = &an->an_node;
1442 struct ieee80211_frame *wh;
1443 uint8_t type, subtype;
1445 wh = mtod(m0, struct ieee80211_frame *);
1446 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1447 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1449 (*queue_to_head) = 0;
1451 /* If it's not in powersave - direct-dispatch BAR */
1452 if ((ATH_NODE(ni)->an_is_powersave == 0)
1453 && type == IEEE80211_FC0_TYPE_CTL &&
1454 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1455 DPRINTF(sc, ATH_DEBUG_SW_TX,
1456 "%s: BAR: TX'ing direct\n", __func__);
1458 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1459 && type == IEEE80211_FC0_TYPE_CTL &&
1460 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1461 /* BAR TX whilst asleep; queue */
1462 DPRINTF(sc, ATH_DEBUG_SW_TX,
1463 "%s: swq: TX'ing\n", __func__);
1464 (*queue_to_head) = 1;
1466 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1467 && (type == IEEE80211_FC0_TYPE_MGT ||
1468 type == IEEE80211_FC0_TYPE_CTL)) {
1470 * Other control/mgmt frame; bypass software queuing
1473 DPRINTF(sc, ATH_DEBUG_XMIT,
1474 "%s: %6D: Node is asleep; sending mgmt "
1475 "(type=%d, subtype=%d)\n",
1476 __func__, ni->ni_macaddr, ":", type, subtype);
1485 * Transmit the given frame to the hardware.
1487 * The frame must already be setup; rate control must already have
1490 * XXX since the TXQ lock is being held here (and I dislike holding
1491 * it for this long when not doing software aggregation), later on
1492 * break this function into "setup_normal" and "xmit_normal". The
1493 * lock only needs to be held for the ath_tx_handoff call.
1495 * XXX we don't update the leak count here - if we're doing
1496 * direct frame dispatch, we need to be able to do it without
1497 * decrementing the leak count (eg multicast queue frames.)
1500 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1503 struct ath_node *an = ATH_NODE(bf->bf_node);
1504 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1506 ATH_TX_LOCK_ASSERT(sc);
1509 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1510 * set a completion handler however it doesn't (yet) properly
1511 * handle the strict ordering requirements needed for normal,
1512 * non-aggregate session frames.
1514 * Once this is implemented, only set CLRDMASK like this for
1515 * frames that must go out - eg management/raw frames.
1517 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1519 /* Setup the descriptor before handoff */
1520 ath_tx_do_ratelookup(sc, bf);
1521 ath_tx_calc_duration(sc, bf);
1522 ath_tx_calc_protection(sc, bf);
1523 ath_tx_set_rtscts(sc, bf);
1524 ath_tx_rate_fill_rcflags(sc, bf);
1525 ath_tx_setds(sc, bf);
1527 /* Track per-TID hardware queue depth correctly */
1530 /* Assign the completion handler */
1531 bf->bf_comp = ath_tx_normal_comp;
1533 /* Hand off to hardware */
1534 ath_tx_handoff(sc, txq, bf);
1538 * Do the basic frame setup stuff that's required before the frame
1539 * is added to a software queue.
1541 * All frames get mostly the same treatment and it's done once.
1542 * Retransmits fiddle with things like the rate control setup,
1543 * setting the retransmit bit in the packet; doing relevant DMA/bus
1544 * syncing and relinking it (back) into the hardware TX queue.
1546 * Note that this may cause the mbuf to be reallocated, so
1547 * m0 may not be valid.
1550 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1551 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1553 struct ieee80211vap *vap = ni->ni_vap;
1554 struct ieee80211com *ic = &sc->sc_ic;
1555 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
1556 int error, iswep, ismcast, isfrag, ismrr;
1557 int keyix, hdrlen, pktlen, try0 = 0;
1558 u_int8_t rix = 0, txrate = 0;
1559 struct ath_desc *ds;
1560 struct ieee80211_frame *wh;
1561 u_int subtype, flags;
1563 const HAL_RATE_TABLE *rt;
1564 HAL_BOOL shortPreamble;
1565 struct ath_node *an;
1567 /* XXX TODO: this pri is only used for non-QoS check, right? */
1571 * To ensure that both sequence numbers and the CCMP PN handling
1572 * is "correct", make sure that the relevant TID queue is locked.
1573 * Otherwise the CCMP PN and seqno may appear out of order, causing
1574 * re-ordered frames to have out of order CCMP PN's, resulting
1575 * in many, many frame drops.
1577 ATH_TX_LOCK_ASSERT(sc);
1579 wh = mtod(m0, struct ieee80211_frame *);
1580 iswep = wh->i_fc[1] & IEEE80211_FC1_PROTECTED;
1581 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1582 isfrag = m0->m_flags & M_FRAG;
1583 hdrlen = ieee80211_anyhdrsize(wh);
1585 * Packet length must not include any
1586 * pad bytes; deduct them here.
1588 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1590 /* Handle encryption twiddling if needed */
1591 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1593 ieee80211_free_mbuf(m0);
1597 /* packet header may have moved, reset our local pointer */
1598 wh = mtod(m0, struct ieee80211_frame *);
1600 pktlen += IEEE80211_CRC_LEN;
1603 * Load the DMA map so any coalescing is done. This
1604 * also calculates the number of descriptors we need.
1606 error = ath_tx_dmasetup(sc, bf, m0);
1609 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
1610 bf->bf_node = ni; /* NB: held reference */
1611 m0 = bf->bf_m; /* NB: may have changed */
1612 wh = mtod(m0, struct ieee80211_frame *);
1614 /* setup descriptors */
1616 rt = sc->sc_currates;
1617 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1620 * NB: the 802.11 layer marks whether or not we should
1621 * use short preamble based on the current mode and
1622 * negotiated parameters.
1624 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1625 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1626 shortPreamble = AH_TRUE;
1627 sc->sc_stats.ast_tx_shortpre++;
1629 shortPreamble = AH_FALSE;
1633 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1635 ismrr = 0; /* default no multi-rate retry*/
1637 pri = ath_tx_getac(sc, m0); /* honor classification */
1638 /* XXX use txparams instead of fixed values */
1640 * Calculate Atheros packet type from IEEE80211 packet header,
1641 * setup for rate calculations, and select h/w transmit queue.
1643 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1644 case IEEE80211_FC0_TYPE_MGT:
1645 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1646 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1647 atype = HAL_PKT_TYPE_BEACON;
1648 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1649 atype = HAL_PKT_TYPE_PROBE_RESP;
1650 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1651 atype = HAL_PKT_TYPE_ATIM;
1653 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1654 rix = an->an_mgmtrix;
1655 txrate = rt->info[rix].rateCode;
1657 txrate |= rt->info[rix].shortPreamble;
1658 try0 = ATH_TXMGTTRY;
1659 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1661 case IEEE80211_FC0_TYPE_CTL:
1662 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1663 rix = an->an_mgmtrix;
1664 txrate = rt->info[rix].rateCode;
1666 txrate |= rt->info[rix].shortPreamble;
1667 try0 = ATH_TXMGTTRY;
1668 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1670 case IEEE80211_FC0_TYPE_DATA:
1671 atype = HAL_PKT_TYPE_NORMAL; /* default */
1673 * Data frames: multicast frames go out at a fixed rate,
1674 * EAPOL frames use the mgmt frame rate; otherwise consult
1675 * the rate control module for the rate to use.
1678 rix = an->an_mcastrix;
1679 txrate = rt->info[rix].rateCode;
1681 txrate |= rt->info[rix].shortPreamble;
1683 } else if (m0->m_flags & M_EAPOL) {
1684 /* XXX? maybe always use long preamble? */
1685 rix = an->an_mgmtrix;
1686 txrate = rt->info[rix].rateCode;
1688 txrate |= rt->info[rix].shortPreamble;
1689 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1692 * Do rate lookup on each TX, rather than using
1693 * the hard-coded TX information decided here.
1696 bf->bf_state.bfs_doratelookup = 1;
1698 if (cap->cap_wmeParams[pri].wmep_noackPolicy)
1699 flags |= HAL_TXDESC_NOACK;
1702 device_printf(sc->sc_dev, "bogus frame type 0x%x (%s)\n",
1703 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1705 /* XXX free tx dmamap */
1706 ieee80211_free_mbuf(m0);
1711 * There are two known scenarios where the frame AC doesn't match
1712 * what the destination TXQ is.
1714 * + non-QoS frames (eg management?) that the net80211 stack has
1715 * assigned a higher AC to, but since it's a non-QoS TID, it's
1716 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1717 * It's quite possible that management frames should just be
1718 * direct dispatched to hardware rather than go via the software
1719 * queue; that should be investigated in the future. There are
1720 * some specific scenarios where this doesn't make sense, mostly
1721 * surrounding ADDBA request/response - hence why that is special
1724 * + Multicast frames going into the VAP mcast queue. That shows up
1727 * This driver should eventually support separate TID and TXQ locking,
1728 * allowing for arbitrary AC frames to appear on arbitrary software
1729 * queues, being queued to the "correct" hardware queue when needed.
1732 if (txq != sc->sc_ac2q[pri]) {
1733 DPRINTF(sc, ATH_DEBUG_XMIT,
1734 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1740 sc->sc_ac2q[pri]->axq_qnum);
1745 * Calculate miscellaneous flags.
1748 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1749 } else if (pktlen > vap->iv_rtsthreshold &&
1750 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1751 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1752 sc->sc_stats.ast_tx_rts++;
1754 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1755 sc->sc_stats.ast_tx_noack++;
1756 #ifdef IEEE80211_SUPPORT_TDMA
1757 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1758 DPRINTF(sc, ATH_DEBUG_TDMA,
1759 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1760 sc->sc_stats.ast_tdma_ack++;
1761 /* XXX free tx dmamap */
1762 ieee80211_free_mbuf(m0);
1768 * If it's a frame to do location reporting on,
1769 * communicate it to the HAL.
1771 if (ieee80211_get_toa_params(m0, NULL)) {
1772 device_printf(sc->sc_dev,
1773 "%s: setting TX positioning bit\n", __func__);
1774 flags |= HAL_TXDESC_POS;
1777 * Note: The hardware reports timestamps for
1778 * each of the RX'ed packets as part of the packet
1779 * exchange. So this means things like RTS/CTS
1780 * exchanges, as well as the final ACK.
1782 * So, if you send a RTS-protected NULL data frame,
1783 * you'll get an RX report for the RTS response, then
1784 * an RX report for the NULL frame, and then the TX
1785 * completion at the end.
1787 * NOTE: it doesn't work right for CCK frames;
1788 * there's no channel info data provided unless
1789 * it's OFDM or HT. Will have to dig into it.
1791 flags &= ~(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
1792 bf->bf_flags |= ATH_BUF_TOA_PROBE;
1797 * Placeholder: if you want to transmit with the azimuth
1798 * timestamp in the end of the payload, here's where you
1799 * should set the TXDESC field.
1801 flags |= HAL_TXDESC_HWTS;
1805 * Determine if a tx interrupt should be generated for
1806 * this descriptor. We take a tx interrupt to reap
1807 * descriptors when the h/w hits an EOL condition or
1808 * when the descriptor is specifically marked to generate
1809 * an interrupt. We periodically mark descriptors in this
1810 * way to insure timely replenishing of the supply needed
1811 * for sending frames. Defering interrupts reduces system
1812 * load and potentially allows more concurrent work to be
1813 * done but if done to aggressively can cause senders to
1816 * NB: use >= to deal with sc_txintrperiod changing
1817 * dynamically through sysctl.
1819 if (flags & HAL_TXDESC_INTREQ) {
1820 txq->axq_intrcnt = 0;
1821 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1822 flags |= HAL_TXDESC_INTREQ;
1823 txq->axq_intrcnt = 0;
1826 /* This point forward is actual TX bits */
1829 * At this point we are committed to sending the frame
1830 * and we don't need to look at m_nextpkt; clear it in
1831 * case this frame is part of frag chain.
1833 m0->m_nextpkt = NULL;
1835 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1836 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1837 sc->sc_hwmap[rix].ieeerate, -1);
1839 if (ieee80211_radiotap_active_vap(vap)) {
1840 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1842 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1844 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1845 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1846 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1847 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1849 ieee80211_radiotap_tx(vap, m0);
1852 /* Blank the legacy rate array */
1853 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1856 * ath_buf_set_rate needs at least one rate/try to setup
1857 * the rate scenario.
1859 bf->bf_state.bfs_rc[0].rix = rix;
1860 bf->bf_state.bfs_rc[0].tries = try0;
1861 bf->bf_state.bfs_rc[0].ratecode = txrate;
1863 /* Store the decided rate index values away */
1864 bf->bf_state.bfs_pktlen = pktlen;
1865 bf->bf_state.bfs_hdrlen = hdrlen;
1866 bf->bf_state.bfs_atype = atype;
1867 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1868 bf->bf_state.bfs_txrate0 = txrate;
1869 bf->bf_state.bfs_try0 = try0;
1870 bf->bf_state.bfs_keyix = keyix;
1871 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1872 bf->bf_state.bfs_txflags = flags;
1873 bf->bf_state.bfs_shpream = shortPreamble;
1875 /* XXX this should be done in ath_tx_setrate() */
1876 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1877 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1878 bf->bf_state.bfs_ctsduration = 0;
1879 bf->bf_state.bfs_ismrr = ismrr;
1885 * Queue a frame to the hardware or software queue.
1887 * This can be called by the net80211 code.
1889 * XXX what about locking? Or, push the seqno assign into the
1890 * XXX aggregate scheduler so its serialised?
1892 * XXX When sending management frames via ath_raw_xmit(),
1893 * should CLRDMASK be set unconditionally?
1896 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1897 struct ath_buf *bf, struct mbuf *m0)
1899 struct ieee80211vap *vap = ni->ni_vap;
1900 struct ath_vap *avp = ATH_VAP(vap);
1904 struct ath_txq *txq;
1906 const struct ieee80211_frame *wh;
1907 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1908 ieee80211_seq seqno;
1909 uint8_t type, subtype;
1912 ATH_TX_LOCK_ASSERT(sc);
1915 * Determine the target hardware queue.
1917 * For multicast frames, the txq gets overridden appropriately
1918 * depending upon the state of PS. If powersave is enabled
1919 * then they get added to the cabq for later transmit.
1921 * The "fun" issue here is that group addressed frames should
1922 * have the sequence number from a different pool, rather than
1923 * the per-TID pool. That means that even QoS group addressed
1924 * frames will have a sequence number from that global value,
1925 * which means if we transmit different group addressed frames
1926 * at different traffic priorities, the sequence numbers will
1927 * all be out of whack. So - chances are, the right thing
1928 * to do here is to always put group addressed frames into the BE
1929 * queue, and ignore the TID for queue selection.
1931 * For any other frame, we do a TID/QoS lookup inside the frame
1932 * to see what the TID should be. If it's a non-QoS frame, the
1933 * AC and TID are overridden. The TID/TXQ code assumes the
1934 * TID is on a predictable hardware TXQ, so we don't support
1935 * having a node TID queued to multiple hardware TXQs.
1936 * This may change in the future but would require some locking
1939 pri = ath_tx_getac(sc, m0);
1940 tid = ath_tx_gettid(sc, m0);
1942 txq = sc->sc_ac2q[pri];
1943 wh = mtod(m0, struct ieee80211_frame *);
1944 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1945 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1946 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1949 * Enforce how deep the multicast queue can grow.
1951 * XXX duplicated in ath_raw_xmit().
1953 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1954 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1955 > sc->sc_txq_mcastq_maxdepth) {
1956 sc->sc_stats.ast_tx_mcastq_overflow++;
1963 * Enforce how deep the unicast queue can grow.
1965 * If the node is in power save then we don't want
1966 * the software queue to grow too deep, or a node may
1967 * end up consuming all of the ath_buf entries.
1969 * For now, only do this for DATA frames.
1971 * We will want to cap how many management/control
1972 * frames get punted to the software queue so it doesn't
1973 * fill up. But the correct solution isn't yet obvious.
1974 * In any case, this check should at least let frames pass
1975 * that we are direct-dispatching.
1977 * XXX TODO: duplicate this to the raw xmit path!
1979 if (type == IEEE80211_FC0_TYPE_DATA &&
1980 ATH_NODE(ni)->an_is_powersave &&
1981 ATH_NODE(ni)->an_swq_depth >
1982 sc->sc_txq_node_psq_maxdepth) {
1983 sc->sc_stats.ast_tx_node_psq_overflow++;
1989 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1990 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1991 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1993 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1994 __func__, tid, pri, is_ampdu);
1996 /* Set local packet state, used to queue packets to hardware */
1997 bf->bf_state.bfs_tid = tid;
1998 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
1999 bf->bf_state.bfs_pri = pri;
2003 * When servicing one or more stations in power-save mode
2004 * (or) if there is some mcast data waiting on the mcast
2005 * queue (to prevent out of order delivery) multicast frames
2006 * must be bufferd until after the beacon.
2008 * TODO: we should lock the mcastq before we check the length.
2010 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
2011 txq = &avp->av_mcastq;
2013 * Mark the frame as eventually belonging on the CAB
2014 * queue, so the descriptor setup functions will
2015 * correctly initialise the descriptor 'qcuId' field.
2017 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
2021 /* Do the generic frame setup */
2022 /* XXX should just bzero the bf_state? */
2023 bf->bf_state.bfs_dobaw = 0;
2025 /* A-MPDU TX? Manually set sequence number */
2027 * Don't do it whilst pending; the net80211 layer still
2030 * Don't assign A-MPDU sequence numbers to group address
2031 * frames; they come from a different sequence number space.
2033 if (is_ampdu_tx && (! IEEE80211_IS_MULTICAST(wh->i_addr1))) {
2035 * Always call; this function will
2036 * handle making sure that null data frames
2037 * and group-addressed frames don't get a sequence number
2038 * from the current TID and thus mess with the BAW.
2040 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
2043 * Don't add QoS NULL frames and group-addressed frames
2046 if (IEEE80211_QOS_HAS_SEQ(wh) &&
2047 (! IEEE80211_IS_MULTICAST(wh->i_addr1)) &&
2048 (subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL)) {
2049 bf->bf_state.bfs_dobaw = 1;
2054 * If needed, the sequence number has been assigned.
2055 * Squirrel it away somewhere easy to get to.
2057 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
2059 /* Is ampdu pending? fetch the seqno and print it out */
2060 if (is_ampdu_pending)
2061 DPRINTF(sc, ATH_DEBUG_SW_TX,
2062 "%s: tid %d: ampdu pending, seqno %d\n",
2063 __func__, tid, M_SEQNO_GET(m0));
2065 /* This also sets up the DMA map; crypto; frame parameters, etc */
2066 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
2071 /* At this point m0 could have changed! */
2076 * If it's a multicast frame, do a direct-dispatch to the
2077 * destination hardware queue. Don't bother software
2081 * If it's a BAR frame, do a direct dispatch to the
2082 * destination hardware queue. Don't bother software
2083 * queuing it, as the TID will now be paused.
2084 * Sending a BAR frame can occur from the net80211 txa timer
2085 * (ie, retries) or from the ath txtask (completion call.)
2086 * It queues directly to hardware because the TID is paused
2087 * at this point (and won't be unpaused until the BAR has
2088 * either been TXed successfully or max retries has been
2092 * Until things are better debugged - if this node is asleep
2093 * and we're sending it a non-BAR frame, direct dispatch it.
2094 * Why? Because we need to figure out what's actually being
2095 * sent - eg, during reassociation/reauthentication after
2096 * the node (last) disappeared whilst asleep, the driver should
2097 * have unpaused/unsleep'ed the node. So until that is
2098 * sorted out, use this workaround.
2100 if (txq == &avp->av_mcastq) {
2101 DPRINTF(sc, ATH_DEBUG_SW_TX,
2102 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2103 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2104 ath_tx_xmit_normal(sc, txq, bf);
2105 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2107 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2109 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2110 ath_tx_xmit_normal(sc, txq, bf);
2114 * For now, since there's no software queue,
2115 * direct-dispatch to the hardware.
2117 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2119 * Update the current leak count if
2120 * we're leaking frames; and set the
2121 * MORE flag as appropriate.
2123 ath_tx_leak_count_update(sc, tid, bf);
2124 ath_tx_xmit_normal(sc, txq, bf);
2131 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2132 struct ath_buf *bf, struct mbuf *m0,
2133 const struct ieee80211_bpf_params *params)
2135 struct ieee80211com *ic = &sc->sc_ic;
2136 struct ieee80211vap *vap = ni->ni_vap;
2137 int error, ismcast, ismrr;
2138 int keyix, hdrlen, pktlen, try0, txantenna;
2139 u_int8_t rix, txrate;
2140 struct ieee80211_frame *wh;
2143 const HAL_RATE_TABLE *rt;
2144 struct ath_desc *ds;
2148 uint8_t type, subtype;
2150 struct ath_node *an = ATH_NODE(ni);
2152 ATH_TX_LOCK_ASSERT(sc);
2154 wh = mtod(m0, struct ieee80211_frame *);
2155 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2156 hdrlen = ieee80211_anyhdrsize(wh);
2158 * Packet length must not include any
2159 * pad bytes; deduct them here.
2161 /* XXX honor IEEE80211_BPF_DATAPAD */
2162 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2164 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2165 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2167 ATH_KTR(sc, ATH_KTR_TX, 2,
2168 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2170 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2173 pri = params->ibp_pri & 3;
2174 /* Override pri if the frame isn't a QoS one */
2175 if (! IEEE80211_QOS_HAS_SEQ(wh))
2176 pri = ath_tx_getac(sc, m0);
2178 /* XXX If it's an ADDBA, override the correct queue */
2179 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2181 /* Map ADDBA to the correct priority */
2184 DPRINTF(sc, ATH_DEBUG_XMIT,
2185 "%s: overriding tid %d pri %d -> %d\n",
2186 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2188 pri = TID_TO_WME_AC(o_tid);
2192 * "pri" is the hardware queue to transmit on.
2194 * Look at the description in ath_tx_start() to understand
2195 * what needs to be "fixed" here so we just use the TID
2199 /* Handle encryption twiddling if needed */
2200 if (! ath_tx_tag_crypto(sc, ni,
2201 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2202 &hdrlen, &pktlen, &keyix)) {
2203 ieee80211_free_mbuf(m0);
2206 /* packet header may have moved, reset our local pointer */
2207 wh = mtod(m0, struct ieee80211_frame *);
2209 /* Do the generic frame setup */
2210 /* XXX should just bzero the bf_state? */
2211 bf->bf_state.bfs_dobaw = 0;
2213 error = ath_tx_dmasetup(sc, bf, m0);
2216 m0 = bf->bf_m; /* NB: may have changed */
2217 wh = mtod(m0, struct ieee80211_frame *);
2218 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
2219 bf->bf_node = ni; /* NB: held reference */
2221 /* Always enable CLRDMASK for raw frames for now.. */
2222 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2223 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2224 if (params->ibp_flags & IEEE80211_BPF_RTS)
2225 flags |= HAL_TXDESC_RTSENA;
2226 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2227 /* XXX assume 11g/11n protection? */
2228 bf->bf_state.bfs_doprot = 1;
2229 flags |= HAL_TXDESC_CTSENA;
2231 /* XXX leave ismcast to injector? */
2232 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2233 flags |= HAL_TXDESC_NOACK;
2235 rt = sc->sc_currates;
2236 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2238 /* Fetch first rate information */
2239 rix = ath_tx_findrix(sc, params->ibp_rate0);
2240 try0 = params->ibp_try0;
2243 * Override EAPOL rate as appropriate.
2245 if (m0->m_flags & M_EAPOL) {
2246 /* XXX? maybe always use long preamble? */
2247 rix = an->an_mgmtrix;
2248 try0 = ATH_TXMAXTRY; /* XXX?too many? */
2252 * If it's a frame to do location reporting on,
2253 * communicate it to the HAL.
2255 if (ieee80211_get_toa_params(m0, NULL)) {
2256 device_printf(sc->sc_dev,
2257 "%s: setting TX positioning bit\n", __func__);
2258 flags |= HAL_TXDESC_POS;
2259 flags &= ~(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA);
2260 bf->bf_flags |= ATH_BUF_TOA_PROBE;
2263 txrate = rt->info[rix].rateCode;
2264 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2265 txrate |= rt->info[rix].shortPreamble;
2267 ismrr = (params->ibp_try1 != 0);
2268 txantenna = params->ibp_pri >> 2;
2269 if (txantenna == 0) /* XXX? */
2270 txantenna = sc->sc_txantenna;
2273 * Since ctsrate is fixed, store it away for later
2274 * use when the descriptor fields are being set.
2276 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2277 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2280 * NB: we mark all packets as type PSPOLL so the h/w won't
2281 * set the sequence number, duration, etc.
2283 atype = HAL_PKT_TYPE_PSPOLL;
2285 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2286 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2287 sc->sc_hwmap[rix].ieeerate, -1);
2289 if (ieee80211_radiotap_active_vap(vap)) {
2290 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2291 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)
2292 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2293 if (m0->m_flags & M_FRAG)
2294 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2295 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2296 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2297 ieee80211_get_node_txpower(ni));
2298 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2300 ieee80211_radiotap_tx(vap, m0);
2304 * Formulate first tx descriptor with tx controls.
2307 /* XXX check return value? */
2309 /* Store the decided rate index values away */
2310 bf->bf_state.bfs_pktlen = pktlen;
2311 bf->bf_state.bfs_hdrlen = hdrlen;
2312 bf->bf_state.bfs_atype = atype;
2313 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2314 ieee80211_get_node_txpower(ni));
2315 bf->bf_state.bfs_txrate0 = txrate;
2316 bf->bf_state.bfs_try0 = try0;
2317 bf->bf_state.bfs_keyix = keyix;
2318 bf->bf_state.bfs_txantenna = txantenna;
2319 bf->bf_state.bfs_txflags = flags;
2320 bf->bf_state.bfs_shpream =
2321 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2323 /* Set local packet state, used to queue packets to hardware */
2324 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2325 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2326 bf->bf_state.bfs_pri = pri;
2328 /* XXX this should be done in ath_tx_setrate() */
2329 bf->bf_state.bfs_ctsrate = 0;
2330 bf->bf_state.bfs_ctsduration = 0;
2331 bf->bf_state.bfs_ismrr = ismrr;
2333 /* Blank the legacy rate array */
2334 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2336 bf->bf_state.bfs_rc[0].rix = rix;
2337 bf->bf_state.bfs_rc[0].tries = try0;
2338 bf->bf_state.bfs_rc[0].ratecode = txrate;
2343 rix = ath_tx_findrix(sc, params->ibp_rate1);
2344 bf->bf_state.bfs_rc[1].rix = rix;
2345 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2347 rix = ath_tx_findrix(sc, params->ibp_rate2);
2348 bf->bf_state.bfs_rc[2].rix = rix;
2349 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2351 rix = ath_tx_findrix(sc, params->ibp_rate3);
2352 bf->bf_state.bfs_rc[3].rix = rix;
2353 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2356 * All the required rate control decisions have been made;
2357 * fill in the rc flags.
2359 ath_tx_rate_fill_rcflags(sc, bf);
2361 /* NB: no buffered multicast in power save support */
2364 * If we're overiding the ADDBA destination, dump directly
2365 * into the hardware queue, right after any pending
2366 * frames to that node are.
2368 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2369 __func__, do_override);
2373 * Put addba frames in the right place in the right TID/HWQ.
2376 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2378 * XXX if it's addba frames, should we be leaking
2379 * them out via the frame leak method?
2380 * XXX for now let's not risk it; but we may wish
2381 * to investigate this later.
2383 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2384 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2386 /* Queue to software queue */
2387 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2389 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2390 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2393 /* Direct-dispatch to the hardware */
2394 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2396 * Update the current leak count if
2397 * we're leaking frames; and set the
2398 * MORE flag as appropriate.
2400 ath_tx_leak_count_update(sc, tid, bf);
2401 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2409 * This can be called by net80211.
2412 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2413 const struct ieee80211_bpf_params *params)
2415 struct ieee80211com *ic = ni->ni_ic;
2416 struct ath_softc *sc = ic->ic_softc;
2418 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2422 if (sc->sc_inreset_cnt > 0) {
2423 DPRINTF(sc, ATH_DEBUG_XMIT,
2424 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2429 sc->sc_txstart_cnt++;
2432 /* Wake the hardware up already */
2434 ath_power_set_power_state(sc, HAL_PM_AWAKE);
2439 if (!sc->sc_running || sc->sc_invalid) {
2440 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, r/i: %d/%d",
2441 __func__, sc->sc_running, sc->sc_invalid);
2448 * Enforce how deep the multicast queue can grow.
2450 * XXX duplicated in ath_tx_start().
2452 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2453 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2454 > sc->sc_txq_mcastq_maxdepth) {
2455 sc->sc_stats.ast_tx_mcastq_overflow++;
2466 * Grab a TX buffer and associated resources.
2468 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2470 sc->sc_stats.ast_tx_nobuf++;
2475 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2478 if (params == NULL) {
2480 * Legacy path; interpret frame contents to decide
2481 * precisely how to send the frame.
2483 if (ath_tx_start(sc, ni, bf, m)) {
2484 error = EIO; /* XXX */
2489 * Caller supplied explicit parameters to use in
2490 * sending the frame.
2492 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2493 error = EIO; /* XXX */
2497 sc->sc_wd_timer = 5;
2498 sc->sc_stats.ast_tx_raw++;
2501 * Update the TIM - if there's anything queued to the
2502 * software queue and power save is enabled, we should
2505 ath_tx_update_tim(sc, ni, 1);
2510 sc->sc_txstart_cnt--;
2514 /* Put the hardware back to sleep if required */
2516 ath_power_restore_power_state(sc);
2522 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2528 ath_returnbuf_head(sc, bf);
2529 ATH_TXBUF_UNLOCK(sc);
2535 sc->sc_txstart_cnt--;
2538 /* Put the hardware back to sleep if required */
2540 ath_power_restore_power_state(sc);
2544 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2546 sc->sc_stats.ast_tx_raw_fail++;
2551 /* Some helper functions */
2554 * ADDBA (and potentially others) need to be placed in the same
2555 * hardware queue as the TID/node it's relating to. This is so
2556 * it goes out after any pending non-aggregate frames to the
2559 * If this isn't done, the ADDBA can go out before the frames
2560 * queued in hardware. Even though these frames have a sequence
2561 * number -earlier- than the ADDBA can be transmitted (but
2562 * no frames whose sequence numbers are after the ADDBA should
2563 * be!) they'll arrive after the ADDBA - and the receiving end
2564 * will simply drop them as being out of the BAW.
2566 * The frames can't be appended to the TID software queue - it'll
2567 * never be sent out. So these frames have to be directly
2568 * dispatched to the hardware, rather than queued in software.
2569 * So if this function returns true, the TXQ has to be
2570 * overridden and it has to be directly dispatched.
2572 * It's a dirty hack, but someone's gotta do it.
2576 * XXX doesn't belong here!
2579 ieee80211_is_action(struct ieee80211_frame *wh)
2581 /* Type: Management frame? */
2582 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2583 IEEE80211_FC0_TYPE_MGT)
2586 /* Subtype: Action frame? */
2587 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2588 IEEE80211_FC0_SUBTYPE_ACTION)
2594 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2596 * Return an alternate TID for ADDBA request frames.
2598 * Yes, this likely should be done in the net80211 layer.
2601 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2602 struct ieee80211_node *ni,
2603 struct mbuf *m0, int *tid)
2605 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2606 struct ieee80211_action_ba_addbarequest *ia;
2608 uint16_t baparamset;
2610 /* Not action frame? Bail */
2611 if (! ieee80211_is_action(wh))
2614 /* XXX Not needed for frames we send? */
2616 /* Correct length? */
2617 if (! ieee80211_parse_action(ni, m))
2621 /* Extract out action frame */
2622 frm = (u_int8_t *)&wh[1];
2623 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2625 /* Not ADDBA? Bail */
2626 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2628 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2631 /* Extract TID, return it */
2632 baparamset = le16toh(ia->rq_baparamset);
2633 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2639 /* Per-node software queue operations */
2642 * Add the current packet to the given BAW.
2643 * It is assumed that the current packet
2645 * + fits inside the BAW;
2646 * + already has had a sequence number allocated.
2648 * Since the BAW status may be modified by both the ath task and
2649 * the net80211/ifnet contexts, the TID must be locked.
2652 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2653 struct ath_tid *tid, struct ath_buf *bf)
2656 struct ieee80211_tx_ampdu *tap;
2658 ATH_TX_LOCK_ASSERT(sc);
2660 if (bf->bf_state.bfs_isretried)
2663 tap = ath_tx_get_tx_tid(an, tid->tid);
2665 if (! bf->bf_state.bfs_dobaw) {
2666 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2667 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2668 __func__, SEQNO(bf->bf_state.bfs_seqno),
2669 tap->txa_start, tap->txa_wnd);
2672 if (bf->bf_state.bfs_addedbaw)
2673 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2674 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2675 "baw head=%d tail=%d\n",
2676 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2677 tap->txa_start, tap->txa_wnd, tid->baw_head,
2681 * Verify that the given sequence number is not outside of the
2682 * BAW. Complain loudly if that's the case.
2684 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2685 SEQNO(bf->bf_state.bfs_seqno))) {
2686 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2687 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2688 "baw head=%d tail=%d\n",
2689 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2690 tap->txa_start, tap->txa_wnd, tid->baw_head,
2695 * ni->ni_txseqs[] is the currently allocated seqno.
2696 * the txa state contains the current baw start.
2698 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2699 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2700 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2701 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2702 "baw head=%d tail=%d\n",
2703 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2704 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2709 assert(tid->tx_buf[cindex] == NULL);
2711 if (tid->tx_buf[cindex] != NULL) {
2712 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2713 "%s: ba packet dup (index=%d, cindex=%d, "
2714 "head=%d, tail=%d)\n",
2715 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2716 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2717 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2719 tid->tx_buf[cindex],
2720 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2722 SEQNO(bf->bf_state.bfs_seqno)
2725 tid->tx_buf[cindex] = bf;
2727 if (index >= ((tid->baw_tail - tid->baw_head) &
2728 (ATH_TID_MAX_BUFS - 1))) {
2729 tid->baw_tail = cindex;
2730 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2735 * Flip the BAW buffer entry over from the existing one to the new one.
2737 * When software retransmitting a (sub-)frame, it is entirely possible that
2738 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2739 * In that instance the buffer is cloned and the new buffer is used for
2740 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2741 * tracking array to maintain consistency.
2744 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2745 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2748 struct ieee80211_tx_ampdu *tap;
2749 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2751 ATH_TX_LOCK_ASSERT(sc);
2753 tap = ath_tx_get_tx_tid(an, tid->tid);
2754 index = ATH_BA_INDEX(tap->txa_start, seqno);
2755 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2758 * Just warn for now; if it happens then we should find out
2759 * about it. It's highly likely the aggregation session will
2762 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2763 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2764 "%s: retransmitted buffer"
2765 " has mismatching seqno's, BA session may hang.\n",
2767 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2768 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2769 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2772 if (tid->tx_buf[cindex] != old_bf) {
2773 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2774 "%s: ath_buf pointer incorrect; "
2775 " has m BA session may hang.\n", __func__);
2776 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2777 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2780 tid->tx_buf[cindex] = new_bf;
2784 * seq_start - left edge of BAW
2785 * seq_next - current/next sequence number to allocate
2787 * Since the BAW status may be modified by both the ath task and
2788 * the net80211/ifnet contexts, the TID must be locked.
2791 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2792 struct ath_tid *tid, const struct ath_buf *bf)
2795 struct ieee80211_tx_ampdu *tap;
2796 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2798 ATH_TX_LOCK_ASSERT(sc);
2800 tap = ath_tx_get_tx_tid(an, tid->tid);
2801 index = ATH_BA_INDEX(tap->txa_start, seqno);
2802 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2804 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2805 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2806 "baw head=%d, tail=%d\n",
2807 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2808 cindex, tid->baw_head, tid->baw_tail);
2811 * If this occurs then we have a big problem - something else
2812 * has slid tap->txa_start along without updating the BAW
2813 * tracking start/end pointers. Thus the TX BAW state is now
2814 * completely busted.
2816 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2817 * it's quite possible that a cloned buffer is making its way
2818 * here and causing it to fire off. Disable TDMA for now.
2820 if (tid->tx_buf[cindex] != bf) {
2821 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2822 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2823 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2824 tid->tx_buf[cindex],
2825 (tid->tx_buf[cindex] != NULL) ?
2826 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2829 tid->tx_buf[cindex] = NULL;
2831 while (tid->baw_head != tid->baw_tail &&
2832 !tid->tx_buf[tid->baw_head]) {
2833 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2834 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2836 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2837 "%s: tid=%d: baw is now %d:%d, baw head=%d\n",
2838 __func__, tid->tid, tap->txa_start, tap->txa_wnd, tid->baw_head);
2842 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2845 struct ieee80211_frame *wh;
2847 ATH_TX_LOCK_ASSERT(sc);
2849 if (tid->an->an_leak_count > 0) {
2850 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2853 * Update MORE based on the software/net80211 queue states.
2855 if ((tid->an->an_stack_psq > 0)
2856 || (tid->an->an_swq_depth > 0))
2857 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2859 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2861 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2862 "%s: %6D: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2864 tid->an->an_node.ni_macaddr,
2866 tid->an->an_leak_count,
2867 tid->an->an_stack_psq,
2868 tid->an->an_swq_depth,
2869 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2872 * Re-sync the underlying buffer.
2874 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2875 BUS_DMASYNC_PREWRITE);
2877 tid->an->an_leak_count --;
2882 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2885 ATH_TX_LOCK_ASSERT(sc);
2887 if (tid->an->an_leak_count > 0) {
2896 * Mark the current node/TID as ready to TX.
2898 * This is done to make it easy for the software scheduler to
2899 * find which nodes have data to send.
2901 * The TXQ lock must be held.
2904 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2906 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2908 ATH_TX_LOCK_ASSERT(sc);
2911 * If we are leaking out a frame to this destination
2912 * for PS-POLL, ensure that we allow scheduling to
2915 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2916 return; /* paused, can't schedule yet */
2919 return; /* already scheduled */
2925 * If this is a sleeping node we're leaking to, given
2926 * it a higher priority. This is so bad for QoS it hurts.
2928 if (tid->an->an_leak_count) {
2929 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2931 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2936 * We can't do the above - it'll confuse the TXQ software
2937 * scheduler which will keep checking the _head_ TID
2938 * in the list to see if it has traffic. If we queue
2939 * a TID to the head of the list and it doesn't transmit,
2940 * we'll check it again.
2942 * So, get the rest of this leaking frames support working
2943 * and reliable first and _then_ optimise it so they're
2944 * pushed out in front of any other pending software
2947 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2951 * Mark the current node as no longer needing to be polled for
2954 * The TXQ lock must be held.
2957 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2959 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2961 ATH_TX_LOCK_ASSERT(sc);
2963 if (tid->sched == 0)
2967 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2971 * Assign a sequence number manually to the given frame.
2973 * This should only be called for A-MPDU TX frames.
2975 * Note: for group addressed frames, the sequence number
2976 * should be from NONQOS_TID, and net80211 should have
2977 * already assigned it for us.
2979 static ieee80211_seq
2980 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2981 struct ath_buf *bf, struct mbuf *m0)
2983 struct ieee80211_frame *wh;
2985 ieee80211_seq seqno;
2988 wh = mtod(m0, struct ieee80211_frame *);
2989 tid = ieee80211_gettid(wh);
2991 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, qos has seq=%d\n",
2992 __func__, tid, IEEE80211_QOS_HAS_SEQ(wh));
2994 /* XXX Is it a control frame? Ignore */
2996 /* Does the packet require a sequence number? */
2997 if (! IEEE80211_QOS_HAS_SEQ(wh))
3000 ATH_TX_LOCK_ASSERT(sc);
3003 * Is it a QOS NULL Data frame? Give it a sequence number from
3004 * the default TID (IEEE80211_NONQOS_TID.)
3006 * The RX path of everything I've looked at doesn't include the NULL
3007 * data frame sequence number in the aggregation state updates, so
3008 * assigning it a sequence number there will cause a BAW hole on the
3011 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
3012 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
3013 /* XXX no locking for this TID? This is a bit of a problem. */
3014 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
3015 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
3016 } else if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
3018 * group addressed frames get a sequence number from
3019 * a different sequence number space.
3021 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
3022 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
3024 /* Manually assign sequence number */
3025 seqno = ni->ni_txseqs[tid];
3026 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
3028 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
3029 M_SEQNO_SET(m0, seqno);
3031 /* Return so caller can do something with it if needed */
3032 DPRINTF(sc, ATH_DEBUG_SW_TX,
3033 "%s: -> subtype=0x%x, tid=%d, seqno=%d\n",
3034 __func__, subtype, tid, seqno);
3039 * Attempt to direct dispatch an aggregate frame to hardware.
3040 * If the frame is out of BAW, queue.
3041 * Otherwise, schedule it as a single frame.
3044 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
3045 struct ath_txq *txq, struct ath_buf *bf)
3047 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
3048 struct ieee80211_tx_ampdu *tap;
3050 ATH_TX_LOCK_ASSERT(sc);
3052 tap = ath_tx_get_tx_tid(an, tid->tid);
3055 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
3056 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3057 /* XXX don't sched - we're paused! */
3061 /* outside baw? queue */
3062 if (bf->bf_state.bfs_dobaw &&
3063 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
3064 SEQNO(bf->bf_state.bfs_seqno)))) {
3065 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3066 ath_tx_tid_sched(sc, tid);
3071 * This is a temporary check and should be removed once
3072 * all the relevant code paths have been fixed.
3074 * During aggregate retries, it's possible that the head
3075 * frame will fail (which has the bfs_aggr and bfs_nframes
3076 * fields set for said aggregate) and will be retried as
3077 * a single frame. In this instance, the values should
3078 * be reset or the completion code will get upset with you.
3080 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
3081 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
3082 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
3083 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
3084 bf->bf_state.bfs_aggr = 0;
3085 bf->bf_state.bfs_nframes = 1;
3088 /* Update CLRDMASK just before this frame is queued */
3089 ath_tx_update_clrdmask(sc, tid, bf);
3091 /* Direct dispatch to hardware */
3092 ath_tx_do_ratelookup(sc, bf);
3093 ath_tx_calc_duration(sc, bf);
3094 ath_tx_calc_protection(sc, bf);
3095 ath_tx_set_rtscts(sc, bf);
3096 ath_tx_rate_fill_rcflags(sc, bf);
3097 ath_tx_setds(sc, bf);
3100 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
3102 /* Track per-TID hardware queue depth correctly */
3106 if (bf->bf_state.bfs_dobaw) {
3107 ath_tx_addto_baw(sc, an, tid, bf);
3108 bf->bf_state.bfs_addedbaw = 1;
3111 /* Set completion handler, multi-frame aggregate or not */
3112 bf->bf_comp = ath_tx_aggr_comp;
3115 * Update the current leak count if
3116 * we're leaking frames; and set the
3117 * MORE flag as appropriate.
3119 ath_tx_leak_count_update(sc, tid, bf);
3121 /* Hand off to hardware */
3122 ath_tx_handoff(sc, txq, bf);
3126 * Attempt to send the packet.
3127 * If the queue isn't busy, direct-dispatch.
3128 * If the queue is busy enough, queue the given packet on the
3129 * relevant software queue.
3132 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3133 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3135 struct ath_node *an = ATH_NODE(ni);
3136 struct ieee80211_frame *wh;
3137 struct ath_tid *atid;
3139 struct mbuf *m0 = bf->bf_m;
3141 ATH_TX_LOCK_ASSERT(sc);
3143 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3144 wh = mtod(m0, struct ieee80211_frame *);
3145 pri = ath_tx_getac(sc, m0);
3146 tid = ath_tx_gettid(sc, m0);
3147 atid = &an->an_tid[tid];
3149 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3150 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3152 /* Set local packet state, used to queue packets to hardware */
3153 /* XXX potentially duplicate info, re-check */
3154 bf->bf_state.bfs_tid = tid;
3155 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3156 bf->bf_state.bfs_pri = pri;
3159 * If the hardware queue isn't busy, queue it directly.
3160 * If the hardware queue is busy, queue it.
3161 * If the TID is paused or the traffic it outside BAW, software
3164 * If the node is in power-save and we're leaking a frame,
3165 * leak a single frame.
3167 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3168 /* TID is paused, queue */
3169 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3171 * If the caller requested that it be sent at a high
3172 * priority, queue it at the head of the list.
3175 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3177 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3178 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3179 /* AMPDU pending; queue */
3180 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3181 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3183 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3185 * AMPDU running, queue single-frame if the hardware queue
3188 * If the hardware queue is busy, sending an aggregate frame
3189 * then just hold off so we can queue more aggregate frames.
3191 * Otherwise we may end up with single frames leaking through
3192 * because we are dispatching them too quickly.
3194 * TODO: maybe we should treat this as two policies - minimise
3195 * latency, or maximise throughput. Then for BE/BK we can
3196 * maximise throughput, and VO/VI (if AMPDU is enabled!)
3201 * Always queue the frame to the tail of the list.
3203 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3206 * If the hardware queue isn't busy, direct dispatch
3207 * the head frame in the list.
3209 * Note: if we're say, configured to do ADDBA but not A-MPDU
3210 * then maybe we want to still queue two non-aggregate frames
3211 * to the hardware. Again with the per-TID policy
3214 * Otherwise, schedule the TID.
3216 /* XXX TXQ locking */
3217 if (txq->axq_depth + txq->fifo.axq_depth == 0) {
3219 bf = ATH_TID_FIRST(atid);
3220 ATH_TID_REMOVE(atid, bf, bf_list);
3223 * Ensure it's definitely treated as a non-AMPDU
3224 * frame - this information may have been left
3225 * over from a previous attempt.
3227 bf->bf_state.bfs_aggr = 0;
3228 bf->bf_state.bfs_nframes = 1;
3230 /* Queue to the hardware */
3231 ath_tx_xmit_aggr(sc, an, txq, bf);
3232 DPRINTF(sc, ATH_DEBUG_SW_TX,
3236 DPRINTF(sc, ATH_DEBUG_SW_TX,
3237 "%s: ampdu; swq'ing\n",
3240 ath_tx_tid_sched(sc, atid);
3243 * If we're not doing A-MPDU, be prepared to direct dispatch
3244 * up to both limits if possible. This particular corner
3245 * case may end up with packet starvation between aggregate
3246 * traffic and non-aggregate traffic: we want to ensure
3247 * that non-aggregate stations get a few frames queued to the
3248 * hardware before the aggregate station(s) get their chance.
3250 * So if you only ever see a couple of frames direct dispatched
3251 * to the hardware from a non-AMPDU client, check both here
3252 * and in the software queue dispatcher to ensure that those
3253 * non-AMPDU stations get a fair chance to transmit.
3255 /* XXX TXQ locking */
3256 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3257 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3258 /* AMPDU not running, attempt direct dispatch */
3259 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3260 /* See if clrdmask needs to be set */
3261 ath_tx_update_clrdmask(sc, atid, bf);
3264 * Update the current leak count if
3265 * we're leaking frames; and set the
3266 * MORE flag as appropriate.
3268 ath_tx_leak_count_update(sc, atid, bf);
3271 * Dispatch the frame.
3273 ath_tx_xmit_normal(sc, txq, bf);
3276 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3277 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3278 ath_tx_tid_sched(sc, atid);
3283 * Only set the clrdmask bit if none of the nodes are currently
3286 * XXX TODO: go through all the callers and check to see
3287 * which are being called in the context of looping over all
3288 * TIDs (eg, if all tids are being paused, resumed, etc.)
3289 * That'll avoid O(n^2) complexity here.
3292 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3296 ATH_TX_LOCK_ASSERT(sc);
3298 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3299 if (an->an_tid[i].isfiltered == 1)
3306 * Configure the per-TID node state.
3308 * This likely belongs in if_ath_node.c but I can't think of anywhere
3309 * else to put it just yet.
3311 * This sets up the SLISTs and the mutex as appropriate.
3314 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3317 struct ath_tid *atid;
3319 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3320 atid = &an->an_tid[i];
3322 /* XXX now with this bzer(), is the field 0'ing needed? */
3323 bzero(atid, sizeof(*atid));
3325 TAILQ_INIT(&atid->tid_q);
3326 TAILQ_INIT(&atid->filtq.tid_q);
3329 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3330 atid->tx_buf[j] = NULL;
3331 atid->baw_head = atid->baw_tail = 0;
3334 atid->hwq_depth = 0;
3335 atid->cleanup_inprogress = 0;
3336 if (i == IEEE80211_NONQOS_TID)
3337 atid->ac = ATH_NONQOS_TID_AC;
3339 atid->ac = TID_TO_WME_AC(i);
3341 an->clrdmask = 1; /* Always start by setting this bit */
3345 * Pause the current TID. This stops packets from being transmitted
3348 * Since this is also called from upper layers as well as the driver,
3349 * it will get the TID lock.
3352 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3355 ATH_TX_LOCK_ASSERT(sc);
3357 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: [%6D]: tid=%d, paused = %d\n",
3359 tid->an->an_node.ni_macaddr, ":",
3365 * Unpause the current TID, and schedule it if needed.
3368 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3370 ATH_TX_LOCK_ASSERT(sc);
3373 * There's some odd places where ath_tx_tid_resume() is called
3374 * when it shouldn't be; this works around that particular issue
3375 * until it's actually resolved.
3377 if (tid->paused == 0) {
3378 device_printf(sc->sc_dev,
3379 "%s: [%6D]: tid=%d, paused=0?\n",
3381 tid->an->an_node.ni_macaddr, ":",
3387 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3388 "%s: [%6D]: tid=%d, unpaused = %d\n",
3390 tid->an->an_node.ni_macaddr, ":",
3398 * Override the clrdmask configuration for the next frame
3399 * from this TID, just to get the ball rolling.
3401 ath_tx_set_clrdmask(sc, tid->an);
3403 if (tid->axq_depth == 0)
3406 /* XXX isfiltered shouldn't ever be 0 at this point */
3407 if (tid->isfiltered == 1) {
3408 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3413 ath_tx_tid_sched(sc, tid);
3416 * Queue the software TX scheduler.
3418 ath_tx_swq_kick(sc);
3422 * Add the given ath_buf to the TID filtered frame list.
3423 * This requires the TID be filtered.
3426 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3430 ATH_TX_LOCK_ASSERT(sc);
3432 if (!tid->isfiltered)
3433 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3436 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3438 /* Set the retry bit and bump the retry counter */
3439 ath_tx_set_retry(sc, bf);
3440 sc->sc_stats.ast_tx_swfiltered++;
3442 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3446 * Handle a completed filtered frame from the given TID.
3447 * This just enables/pauses the filtered frame state if required
3448 * and appends the filtered frame to the filtered queue.
3451 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3455 ATH_TX_LOCK_ASSERT(sc);
3457 if (! tid->isfiltered) {
3458 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d; filter transition\n",
3459 __func__, tid->tid);
3460 tid->isfiltered = 1;
3461 ath_tx_tid_pause(sc, tid);
3464 /* Add the frame to the filter queue */
3465 ath_tx_tid_filt_addbuf(sc, tid, bf);
3469 * Complete the filtered frame TX completion.
3471 * If there are no more frames in the hardware queue, unpause/unfilter
3472 * the TID if applicable. Otherwise we will wait for a node PS transition
3476 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3481 ATH_TX_LOCK_ASSERT(sc);
3483 if (tid->hwq_depth != 0)
3486 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d, hwq=0, transition back\n",
3487 __func__, tid->tid);
3488 if (tid->isfiltered == 1) {
3489 tid->isfiltered = 0;
3493 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3494 ath_tx_set_clrdmask(sc, tid->an);
3496 /* XXX this is really quite inefficient */
3497 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3498 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3499 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3502 /* And only resume if we had paused before */
3504 ath_tx_tid_resume(sc, tid);
3508 * Called when a single (aggregate or otherwise) frame is completed.
3510 * Returns 0 if the buffer could be added to the filtered list
3511 * (cloned or otherwise), 1 if the buffer couldn't be added to the
3512 * filtered list (failed clone; expired retry) and the caller should
3513 * free it and handle it like a failure (eg by sending a BAR.)
3515 * since the buffer may be cloned, bf must be not touched after this
3516 * if the return value is 0.
3519 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3522 struct ath_buf *nbf;
3525 ATH_TX_LOCK_ASSERT(sc);
3528 * Don't allow a filtered frame to live forever.
3530 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3531 sc->sc_stats.ast_tx_swretrymax++;
3532 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3533 "%s: bf=%p, seqno=%d, exceeded retries\n",
3536 SEQNO(bf->bf_state.bfs_seqno));
3537 retval = 1; /* error */
3542 * A busy buffer can't be added to the retry list.
3543 * It needs to be cloned.
3545 if (bf->bf_flags & ATH_BUF_BUSY) {
3546 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3547 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3548 "%s: busy buffer clone: %p -> %p\n",
3555 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3556 "%s: busy buffer couldn't be cloned (%p)!\n",
3558 retval = 1; /* error */
3560 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3561 retval = 0; /* ok */
3564 ath_tx_tid_filt_comp_complete(sc, tid);
3570 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3571 struct ath_buf *bf_first, ath_bufhead *bf_q)
3573 struct ath_buf *bf, *bf_next, *nbf;
3575 ATH_TX_LOCK_ASSERT(sc);
3579 bf_next = bf->bf_next;
3580 bf->bf_next = NULL; /* Remove it from the aggr list */
3583 * Don't allow a filtered frame to live forever.
3585 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3586 sc->sc_stats.ast_tx_swretrymax++;
3587 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3588 "%s: tid=%d, bf=%p, seqno=%d, exceeded retries\n",
3592 SEQNO(bf->bf_state.bfs_seqno));
3593 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3597 if (bf->bf_flags & ATH_BUF_BUSY) {
3598 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3599 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3600 "%s: tid=%d, busy buffer cloned: %p -> %p, seqno=%d\n",
3601 __func__, tid->tid, bf, nbf, SEQNO(bf->bf_state.bfs_seqno));
3607 * If the buffer couldn't be cloned, add it to bf_q;
3608 * the caller will free the buffer(s) as required.
3611 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3612 "%s: tid=%d, buffer couldn't be cloned! (%p) seqno=%d\n",
3613 __func__, tid->tid, bf, SEQNO(bf->bf_state.bfs_seqno));
3614 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3616 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3622 ath_tx_tid_filt_comp_complete(sc, tid);
3626 * Suspend the queue because we need to TX a BAR.
3629 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3632 ATH_TX_LOCK_ASSERT(sc);
3634 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3635 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3641 /* We shouldn't be called when bar_tx is 1 */
3643 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3644 "%s: bar_tx is 1?!\n", __func__);
3647 /* If we've already been called, just be patient. */
3654 /* Only one pause, no matter how many frames fail */
3655 ath_tx_tid_pause(sc, tid);
3659 * We've finished with BAR handling - either we succeeded or
3660 * failed. Either way, unsuspend TX.
3663 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3666 ATH_TX_LOCK_ASSERT(sc);
3668 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3669 "%s: %6D: TID=%d, called\n",
3671 tid->an->an_node.ni_macaddr,
3675 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3676 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3677 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3678 __func__, tid->an->an_node.ni_macaddr, ":",
3679 tid->tid, tid->bar_tx, tid->bar_wait);
3682 tid->bar_tx = tid->bar_wait = 0;
3683 ath_tx_tid_resume(sc, tid);
3687 * Return whether we're ready to TX a BAR frame.
3689 * Requires the TID lock be held.
3692 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3695 ATH_TX_LOCK_ASSERT(sc);
3697 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3700 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3701 "%s: %6D: TID=%d, bar ready\n",
3703 tid->an->an_node.ni_macaddr,
3711 * Check whether the current TID is ready to have a BAR
3712 * TXed and if so, do the TX.
3714 * Since the TID/TXQ lock can't be held during a call to
3715 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3716 * sending the BAR and locking it again.
3718 * Eventually, the code to send the BAR should be broken out
3719 * from this routine so the lock doesn't have to be reacquired
3720 * just to be immediately dropped by the caller.
3723 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3725 struct ieee80211_tx_ampdu *tap;
3727 ATH_TX_LOCK_ASSERT(sc);
3729 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3730 "%s: %6D: TID=%d, called\n",
3732 tid->an->an_node.ni_macaddr,
3736 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3739 * This is an error condition!
3741 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3742 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3743 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3744 __func__, tid->an->an_node.ni_macaddr, ":",
3745 tid->tid, tid->bar_tx, tid->bar_wait);
3749 /* Don't do anything if we still have pending frames */
3750 if (tid->hwq_depth > 0) {
3751 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3752 "%s: %6D: TID=%d, hwq_depth=%d, waiting\n",
3754 tid->an->an_node.ni_macaddr,
3761 /* We're now about to TX */
3765 * Override the clrdmask configuration for the next frame,
3766 * just to get the ball rolling.
3768 ath_tx_set_clrdmask(sc, tid->an);
3771 * Calculate new BAW left edge, now that all frames have either
3772 * succeeded or failed.
3774 * XXX verify this is _actually_ the valid value to begin at!
3776 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3777 "%s: %6D: TID=%d, new BAW left edge=%d\n",
3779 tid->an->an_node.ni_macaddr,
3784 /* Try sending the BAR frame */
3785 /* We can't hold the lock here! */
3788 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3789 /* Success? Now we wait for notification that it's done */
3794 /* Failure? For now, warn loudly and continue */
3796 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3797 "%s: %6D: TID=%d, failed to TX BAR, continue!\n",
3798 __func__, tid->an->an_node.ni_macaddr, ":",
3800 ath_tx_tid_bar_unsuspend(sc, tid);
3804 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3805 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3808 ATH_TX_LOCK_ASSERT(sc);
3811 * If the current TID is running AMPDU, update
3814 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3815 bf->bf_state.bfs_dobaw) {
3817 * Only remove the frame from the BAW if it's
3818 * been transmitted at least once; this means
3819 * the frame was in the BAW to begin with.
3821 if (bf->bf_state.bfs_retries > 0) {
3822 ath_tx_update_baw(sc, an, tid, bf);
3823 bf->bf_state.bfs_dobaw = 0;
3827 * This has become a non-fatal error now
3829 if (! bf->bf_state.bfs_addedbaw)
3830 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3831 "%s: wasn't added: seqno %d\n",
3832 __func__, SEQNO(bf->bf_state.bfs_seqno));
3836 /* Strip it out of an aggregate list if it was in one */
3839 /* Insert on the free queue to be freed by the caller */
3840 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3844 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3845 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3847 struct ieee80211_node *ni = &an->an_node;
3848 struct ath_txq *txq;
3849 struct ieee80211_tx_ampdu *tap;
3851 txq = sc->sc_ac2q[tid->ac];
3852 tap = ath_tx_get_tx_tid(an, tid->tid);
3854 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3855 "%s: %s: %6D: bf=%p: addbaw=%d, dobaw=%d, "
3856 "seqno=%d, retry=%d\n",
3862 bf->bf_state.bfs_addedbaw,
3863 bf->bf_state.bfs_dobaw,
3864 SEQNO(bf->bf_state.bfs_seqno),
3865 bf->bf_state.bfs_retries);
3866 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3867 "%s: %s: %6D: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3875 txq->axq_aggr_depth);
3876 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3877 "%s: %s: %6D: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3888 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3889 "%s: %s: %6D: tid %d: "
3890 "sched=%d, paused=%d, "
3891 "incomp=%d, baw_head=%d, "
3892 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3898 tid->sched, tid->paused,
3899 tid->incomp, tid->baw_head,
3900 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3901 ni->ni_txseqs[tid->tid]);
3903 /* XXX Dump the frame, see what it is? */
3904 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
3905 ieee80211_dump_pkt(ni->ni_ic,
3906 mtod(bf->bf_m, const uint8_t *),
3907 bf->bf_m->m_len, 0, -1);
3911 * Free any packets currently pending in the software TX queue.
3913 * This will be called when a node is being deleted.
3915 * It can also be called on an active node during an interface
3916 * reset or state transition.
3918 * (From Linux/reference):
3920 * TODO: For frame(s) that are in the retry state, we will reuse the
3921 * sequence number(s) without setting the retry bit. The
3922 * alternative is to give up on these and BAR the receiver's window
3926 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3927 struct ath_tid *tid, ath_bufhead *bf_cq)
3930 struct ieee80211_tx_ampdu *tap;
3931 struct ieee80211_node *ni = &an->an_node;
3934 tap = ath_tx_get_tx_tid(an, tid->tid);
3936 ATH_TX_LOCK_ASSERT(sc);
3938 /* Walk the queue, free frames */
3941 bf = ATH_TID_FIRST(tid);
3947 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3951 ATH_TID_REMOVE(tid, bf, bf_list);
3952 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3955 /* And now, drain the filtered frame queue */
3958 bf = ATH_TID_FILT_FIRST(tid);
3963 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3967 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3968 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3972 * Override the clrdmask configuration for the next frame
3973 * in case there is some future transmission, just to get
3976 * This won't hurt things if the TID is about to be freed.
3978 ath_tx_set_clrdmask(sc, tid->an);
3981 * Now that it's completed, grab the TID lock and update
3982 * the sequence number and BAW window.
3983 * Because sequence numbers have been assigned to frames
3984 * that haven't been sent yet, it's entirely possible
3985 * we'll be called with some pending frames that have not
3988 * The cleaner solution is to do the sequence number allocation
3989 * when the packet is first transmitted - and thus the "retries"
3990 * check above would be enough to update the BAW/seqno.
3993 /* But don't do it for non-QoS TIDs */
3996 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3997 "%s: %6D: node %p: TID %d: sliding BAW left edge to %d\n",
4005 ni->ni_txseqs[tid->tid] = tap->txa_start;
4006 tid->baw_tail = tid->baw_head;
4011 * Reset the TID state. This must be only called once the node has
4012 * had its frames flushed from this TID, to ensure that no other
4013 * pause / unpause logic can kick in.
4016 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
4020 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
4021 tid->paused = tid->sched = tid->addba_tx_pending = 0;
4022 tid->incomp = tid->cleanup_inprogress = 0;
4026 * If we have a bar_wait set, we need to unpause the TID
4027 * here. Otherwise once cleanup has finished, the TID won't
4028 * have the right paused counter.
4030 * XXX I'm not going through resume here - I don't want the
4031 * node to be rescheuled just yet. This however should be
4034 if (tid->bar_wait) {
4035 if (tid->paused > 0) {
4041 * XXX same with a currently filtered TID.
4043 * Since this is being called during a flush, we assume that
4044 * the filtered frame list is actually empty.
4046 * XXX TODO: add in a check to ensure that the filtered queue
4047 * depth is actually 0!
4049 if (tid->isfiltered) {
4050 if (tid->paused > 0) {
4056 * Clear BAR, filtered frames, scheduled and ADDBA pending.
4057 * The TID may be going through cleanup from the last association
4058 * where things in the BAW are still in the hardware queue.
4062 tid->isfiltered = 0;
4064 tid->addba_tx_pending = 0;
4067 * XXX TODO: it may just be enough to walk the HWQs and mark
4068 * frames for that node as non-aggregate; or mark the ath_node
4069 * with something that indicates that aggregation is no longer
4070 * occurring. Then we can just toss the BAW complaints and
4071 * do a complete hard reset of state here - no pause, no
4072 * complete counter, etc.
4078 * Flush all software queued packets for the given node.
4080 * This occurs when a completion handler frees the last buffer
4081 * for a node, and the node is thus freed. This causes the node
4082 * to be cleaned up, which ends up calling ath_tx_node_flush.
4085 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
4093 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
4097 DPRINTF(sc, ATH_DEBUG_NODE,
4098 "%s: %6D: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
4099 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
4101 an->an_node.ni_macaddr,
4103 an->an_is_powersave,
4110 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
4111 struct ath_tid *atid = &an->an_tid[tid];
4114 ath_tx_tid_drain(sc, an, atid, &bf_cq);
4116 /* Remove this tid from the list of active tids */
4117 ath_tx_tid_unsched(sc, atid);
4119 /* Reset the per-TID pause, BAR, etc state */
4120 ath_tx_tid_reset(sc, atid);
4124 * Clear global leak count
4126 an->an_leak_count = 0;
4129 /* Handle completed frames */
4130 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4131 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4132 ath_tx_default_comp(sc, bf, 0);
4137 * Drain all the software TXQs currently with traffic queued.
4140 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
4142 struct ath_tid *tid;
4150 * Iterate over all active tids for the given txq,
4151 * flushing and unsched'ing them
4153 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
4154 tid = TAILQ_FIRST(&txq->axq_tidq);
4155 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
4156 ath_tx_tid_unsched(sc, tid);
4161 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4162 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4163 ath_tx_default_comp(sc, bf, 0);
4168 * Handle completion of non-aggregate session frames.
4170 * This (currently) doesn't implement software retransmission of
4171 * non-aggregate frames!
4173 * Software retransmission of non-aggregate frames needs to obey
4174 * the strict sequence number ordering, and drop any frames that
4177 * For now, filtered frames and frame transmission will cause
4178 * all kinds of issues. So we don't support them.
4180 * So anyone queuing frames via ath_tx_normal_xmit() or
4181 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4184 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4186 struct ieee80211_node *ni = bf->bf_node;
4187 struct ath_node *an = ATH_NODE(ni);
4188 int tid = bf->bf_state.bfs_tid;
4189 struct ath_tid *atid = &an->an_tid[tid];
4190 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4192 /* The TID state is protected behind the TXQ lock */
4195 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4196 __func__, bf, fail, atid->hwq_depth - 1);
4202 * If the frame was filtered, stick it on the filter frame
4203 * queue and complain about it. It shouldn't happen!
4205 if ((ts->ts_status & HAL_TXERR_FILT) ||
4206 (ts->ts_status != 0 && atid->isfiltered)) {
4207 DPRINTF(sc, ATH_DEBUG_SW_TX,
4208 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4212 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4215 if (atid->isfiltered)
4216 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4217 if (atid->hwq_depth < 0)
4218 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4219 __func__, atid->hwq_depth);
4221 /* If the TID is being cleaned up, track things */
4223 if (atid->cleanup_inprogress) {
4225 if (atid->incomp == 0) {
4226 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4227 "%s: TID %d: cleaned up! resume!\n",
4229 atid->cleanup_inprogress = 0;
4230 ath_tx_tid_resume(sc, atid);
4235 * If the queue is filtered, potentially mark it as complete
4236 * and reschedule it as needed.
4238 * This is required as there may be a subsequent TX descriptor
4239 * for this end-node that has CLRDMASK set, so it's quite possible
4240 * that a filtered frame will be followed by a non-filtered
4241 * (complete or otherwise) frame.
4243 * XXX should we do this before we complete the frame?
4245 if (atid->isfiltered)
4246 ath_tx_tid_filt_comp_complete(sc, atid);
4250 * punt to rate control if we're not being cleaned up
4251 * during a hw queue drain and the frame wanted an ACK.
4253 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4254 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4255 ts, bf->bf_state.bfs_pktlen,
4256 1, (ts->ts_status == 0) ? 0 : 1);
4258 ath_tx_default_comp(sc, bf, fail);
4262 * Handle cleanup of aggregate session packets that aren't
4265 * There's no need to update the BAW here - the session is being
4269 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4271 struct ieee80211_node *ni = bf->bf_node;
4272 struct ath_node *an = ATH_NODE(ni);
4273 int tid = bf->bf_state.bfs_tid;
4274 struct ath_tid *atid = &an->an_tid[tid];
4276 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4277 __func__, tid, atid->incomp);
4283 if (bf->bf_state.bfs_dobaw) {
4284 ath_tx_update_baw(sc, an, atid, bf);
4285 if (!bf->bf_state.bfs_addedbaw)
4286 DPRINTF(sc, ATH_DEBUG_SW_TX,
4287 "%s: wasn't added: seqno %d\n",
4288 __func__, SEQNO(bf->bf_state.bfs_seqno));
4291 if (atid->incomp == 0) {
4292 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4293 "%s: TID %d: cleaned up! resume!\n",
4295 atid->cleanup_inprogress = 0;
4296 ath_tx_tid_resume(sc, atid);
4300 ath_tx_default_comp(sc, bf, 0);
4305 * This as it currently stands is a bit dumb. Ideally we'd just
4306 * fail the frame the normal way and have it permanently fail
4307 * via the normal aggregate completion path.
4310 ath_tx_tid_cleanup_frame(struct ath_softc *sc, struct ath_node *an,
4311 int tid, struct ath_buf *bf_head, ath_bufhead *bf_cq)
4313 struct ath_tid *atid = &an->an_tid[tid];
4314 struct ath_buf *bf, *bf_next;
4316 ATH_TX_LOCK_ASSERT(sc);
4319 * Remove this frame from the queue.
4321 ATH_TID_REMOVE(atid, bf_head, bf_list);
4324 * Loop over all the frames in the aggregate.
4327 while (bf != NULL) {
4328 bf_next = bf->bf_next; /* next aggregate frame, or NULL */
4331 * If it's been added to the BAW we need to kick
4332 * it out of the BAW before we continue.
4334 * XXX if it's an aggregate, assert that it's in the
4335 * BAW - we shouldn't have it be in an aggregate
4338 if (bf->bf_state.bfs_addedbaw) {
4339 ath_tx_update_baw(sc, an, atid, bf);
4340 bf->bf_state.bfs_dobaw = 0;
4344 * Give it the default completion handler.
4346 bf->bf_comp = ath_tx_normal_comp;
4350 * Add it to the list to free.
4352 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4355 * Now advance to the next frame in the aggregate.
4362 * Performs transmit side cleanup when TID changes from aggregated to
4363 * unaggregated and during reassociation.
4365 * For now, this just tosses everything from the TID software queue
4366 * whether or not it has been retried and marks the TID as
4367 * pending completion if there's anything for this TID queued to
4370 * The caller is responsible for pausing the TID and unpausing the
4371 * TID if no cleanup was required. Otherwise the cleanup path will
4372 * unpause the TID once the last hardware queued frame is completed.
4375 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4378 struct ath_tid *atid = &an->an_tid[tid];
4379 struct ath_buf *bf, *bf_next;
4381 ATH_TX_LOCK_ASSERT(sc);
4383 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4384 "%s: TID %d: called; inprogress=%d\n", __func__, tid,
4385 atid->cleanup_inprogress);
4388 * Move the filtered frames to the TX queue, before
4389 * we run off and discard/process things.
4392 /* XXX this is really quite inefficient */
4393 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4394 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4395 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4399 * Update the frames in the software TX queue:
4401 * + Discard retry frames in the queue
4402 * + Fix the completion function to be non-aggregate
4404 bf = ATH_TID_FIRST(atid);
4407 * Grab the next frame in the list, we may
4408 * be fiddling with the list.
4410 bf_next = TAILQ_NEXT(bf, bf_list);
4413 * Free the frame and all subframes.
4415 ath_tx_tid_cleanup_frame(sc, an, tid, bf, bf_cq);
4424 * If there's anything in the hardware queue we wait
4425 * for the TID HWQ to empty.
4427 if (atid->hwq_depth > 0) {
4429 * XXX how about we kill atid->incomp, and instead
4430 * replace it with a macro that checks that atid->hwq_depth
4433 atid->incomp = atid->hwq_depth;
4434 atid->cleanup_inprogress = 1;
4437 if (atid->cleanup_inprogress)
4438 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4439 "%s: TID %d: cleanup needed: %d packets\n",
4440 __func__, tid, atid->incomp);
4442 /* Owner now must free completed frames */
4445 static struct ath_buf *
4446 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4447 struct ath_tid *tid, struct ath_buf *bf)
4449 struct ath_buf *nbf;
4453 * Clone the buffer. This will handle the dma unmap and
4454 * copy the node reference to the new buffer. If this
4455 * works out, 'bf' will have no DMA mapping, no mbuf
4456 * pointer and no node reference.
4458 nbf = ath_buf_clone(sc, bf);
4461 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4466 /* Failed to clone */
4467 DPRINTF(sc, ATH_DEBUG_XMIT,
4468 "%s: failed to clone a busy buffer\n",
4473 /* Setup the dma for the new buffer */
4474 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4476 DPRINTF(sc, ATH_DEBUG_XMIT,
4477 "%s: failed to setup dma for clone\n",
4480 * Put this at the head of the list, not tail;
4481 * that way it doesn't interfere with the
4482 * busy buffer logic (which uses the tail of
4486 ath_returnbuf_head(sc, nbf);
4487 ATH_TXBUF_UNLOCK(sc);
4491 /* Update BAW if required, before we free the original buf */
4492 if (bf->bf_state.bfs_dobaw)
4493 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4495 /* Free original buffer; return new buffer */
4496 ath_freebuf(sc, bf);
4502 * Handle retrying an unaggregate frame in an aggregate
4505 * If too many retries occur, pause the TID, wait for
4506 * any further retransmits (as there's no reason why
4507 * non-aggregate frames in an aggregate session are
4508 * transmitted in-order; they just have to be in-BAW)
4509 * and then queue a BAR.
4512 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4514 struct ieee80211_node *ni = bf->bf_node;
4515 struct ath_node *an = ATH_NODE(ni);
4516 int tid = bf->bf_state.bfs_tid;
4517 struct ath_tid *atid = &an->an_tid[tid];
4518 struct ieee80211_tx_ampdu *tap;
4522 tap = ath_tx_get_tx_tid(an, tid);
4525 * If the buffer is marked as busy, we can't directly
4526 * reuse it. Instead, try to clone the buffer.
4527 * If the clone is successful, recycle the old buffer.
4528 * If the clone is unsuccessful, set bfs_retries to max
4529 * to force the next bit of code to free the buffer
4532 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4533 (bf->bf_flags & ATH_BUF_BUSY)) {
4534 struct ath_buf *nbf;
4535 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4537 /* bf has been freed at this point */
4540 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4543 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4544 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4545 "%s: exceeded retries; seqno %d\n",
4546 __func__, SEQNO(bf->bf_state.bfs_seqno));
4547 sc->sc_stats.ast_tx_swretrymax++;
4549 /* Update BAW anyway */
4550 if (bf->bf_state.bfs_dobaw) {
4551 ath_tx_update_baw(sc, an, atid, bf);
4552 if (! bf->bf_state.bfs_addedbaw)
4553 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4554 "%s: wasn't added: seqno %d\n",
4555 __func__, SEQNO(bf->bf_state.bfs_seqno));
4557 bf->bf_state.bfs_dobaw = 0;
4559 /* Suspend the TX queue and get ready to send the BAR */
4560 ath_tx_tid_bar_suspend(sc, atid);
4562 /* Send the BAR if there are no other frames waiting */
4563 if (ath_tx_tid_bar_tx_ready(sc, atid))
4564 ath_tx_tid_bar_tx(sc, atid);
4568 /* Free buffer, bf is free after this call */
4569 ath_tx_default_comp(sc, bf, 0);
4574 * This increments the retry counter as well as
4575 * sets the retry flag in the ath_buf and packet
4578 ath_tx_set_retry(sc, bf);
4579 sc->sc_stats.ast_tx_swretries++;
4582 * Insert this at the head of the queue, so it's
4583 * retried before any current/subsequent frames.
4585 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4586 ath_tx_tid_sched(sc, atid);
4587 /* Send the BAR if there are no other frames waiting */
4588 if (ath_tx_tid_bar_tx_ready(sc, atid))
4589 ath_tx_tid_bar_tx(sc, atid);
4595 * Common code for aggregate excessive retry/subframe retry.
4596 * If retrying, queues buffers to bf_q. If not, frees the
4599 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4602 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4605 struct ieee80211_node *ni = bf->bf_node;
4606 struct ath_node *an = ATH_NODE(ni);
4607 int tid = bf->bf_state.bfs_tid;
4608 struct ath_tid *atid = &an->an_tid[tid];
4610 ATH_TX_LOCK_ASSERT(sc);
4612 /* XXX clr11naggr should be done for all subframes */
4613 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4614 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4616 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4619 * If the buffer is marked as busy, we can't directly
4620 * reuse it. Instead, try to clone the buffer.
4621 * If the clone is successful, recycle the old buffer.
4622 * If the clone is unsuccessful, set bfs_retries to max
4623 * to force the next bit of code to free the buffer
4626 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4627 (bf->bf_flags & ATH_BUF_BUSY)) {
4628 struct ath_buf *nbf;
4629 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4631 /* bf has been freed at this point */
4634 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4637 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4638 sc->sc_stats.ast_tx_swretrymax++;
4639 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4640 "%s: max retries: seqno %d\n",
4641 __func__, SEQNO(bf->bf_state.bfs_seqno));
4642 ath_tx_update_baw(sc, an, atid, bf);
4643 if (!bf->bf_state.bfs_addedbaw)
4644 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4645 "%s: wasn't added: seqno %d\n",
4646 __func__, SEQNO(bf->bf_state.bfs_seqno));
4647 bf->bf_state.bfs_dobaw = 0;
4651 ath_tx_set_retry(sc, bf);
4652 sc->sc_stats.ast_tx_swretries++;
4653 bf->bf_next = NULL; /* Just to make sure */
4655 /* Clear the aggregate state */
4656 bf->bf_state.bfs_aggr = 0;
4657 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4658 bf->bf_state.bfs_nframes = 1;
4660 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4665 * error pkt completion for an aggregate destination
4668 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4669 struct ath_tid *tid)
4671 struct ieee80211_node *ni = bf_first->bf_node;
4672 struct ath_node *an = ATH_NODE(ni);
4673 struct ath_buf *bf_next, *bf;
4676 struct ieee80211_tx_ampdu *tap;
4683 * Update rate control - all frames have failed.
4685 * XXX use the length in the first frame in the series;
4686 * XXX just so things are consistent for now.
4688 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4689 &bf_first->bf_status.ds_txstat,
4690 bf_first->bf_state.bfs_pktlen,
4691 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4694 tap = ath_tx_get_tx_tid(an, tid->tid);
4695 sc->sc_stats.ast_tx_aggr_failall++;
4697 /* Retry all subframes */
4700 bf_next = bf->bf_next;
4701 bf->bf_next = NULL; /* Remove it from the aggr list */
4702 sc->sc_stats.ast_tx_aggr_fail++;
4703 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4706 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4711 /* Prepend all frames to the beginning of the queue */
4712 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4713 TAILQ_REMOVE(&bf_q, bf, bf_list);
4714 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4718 * Schedule the TID to be re-tried.
4720 ath_tx_tid_sched(sc, tid);
4723 * send bar if we dropped any frames
4725 * Keep the txq lock held for now, as we need to ensure
4726 * that ni_txseqs[] is consistent (as it's being updated
4727 * in the ifnet TX context or raw TX context.)
4730 /* Suspend the TX queue and get ready to send the BAR */
4731 ath_tx_tid_bar_suspend(sc, tid);
4735 * Send BAR if required
4737 if (ath_tx_tid_bar_tx_ready(sc, tid))
4738 ath_tx_tid_bar_tx(sc, tid);
4742 /* Complete frames which errored out */
4743 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4744 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4745 ath_tx_default_comp(sc, bf, 0);
4750 * Handle clean-up of packets from an aggregate list.
4752 * There's no need to update the BAW here - the session is being
4756 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4758 struct ath_buf *bf, *bf_next;
4759 struct ieee80211_node *ni = bf_first->bf_node;
4760 struct ath_node *an = ATH_NODE(ni);
4761 int tid = bf_first->bf_state.bfs_tid;
4762 struct ath_tid *atid = &an->an_tid[tid];
4769 /* Update the BAW */
4773 if (bf->bf_state.bfs_dobaw) {
4774 ath_tx_update_baw(sc, an, atid, bf);
4775 if (!bf->bf_state.bfs_addedbaw)
4776 DPRINTF(sc, ATH_DEBUG_SW_TX,
4777 "%s: wasn't added: seqno %d\n",
4778 __func__, SEQNO(bf->bf_state.bfs_seqno));
4783 if (atid->incomp == 0) {
4784 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4785 "%s: TID %d: cleaned up! resume!\n",
4787 atid->cleanup_inprogress = 0;
4788 ath_tx_tid_resume(sc, atid);
4791 /* Send BAR if required */
4792 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4794 * XXX TODO: we should likely just tear down the BAR state here,
4795 * rather than sending a BAR.
4797 if (ath_tx_tid_bar_tx_ready(sc, atid))
4798 ath_tx_tid_bar_tx(sc, atid);
4802 /* Handle frame completion as individual frames */
4805 bf_next = bf->bf_next;
4807 ath_tx_default_comp(sc, bf, 1);
4813 * Handle completion of an set of aggregate frames.
4815 * Note: the completion handler is the last descriptor in the aggregate,
4816 * not the last descriptor in the first frame.
4819 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4822 //struct ath_desc *ds = bf->bf_lastds;
4823 struct ieee80211_node *ni = bf_first->bf_node;
4824 struct ath_node *an = ATH_NODE(ni);
4825 int tid = bf_first->bf_state.bfs_tid;
4826 struct ath_tid *atid = &an->an_tid[tid];
4827 struct ath_tx_status ts;
4828 struct ieee80211_tx_ampdu *tap;
4834 struct ath_buf *bf, *bf_next;
4837 int nframes = 0, nbad = 0, nf;
4839 /* XXX there's too much on the stack? */
4840 struct ath_rc_series rc[ATH_RC_NUM];
4843 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4844 __func__, atid->hwq_depth);
4847 * Take a copy; this may be needed -after- bf_first
4848 * has been completed and freed.
4850 ts = bf_first->bf_status.ds_txstat;
4855 /* The TID state is kept behind the TXQ lock */
4859 if (atid->hwq_depth < 0)
4860 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4861 __func__, atid->hwq_depth);
4864 * If the TID is filtered, handle completing the filter
4865 * transition before potentially kicking it to the cleanup
4868 * XXX this is duplicate work, ew.
4870 if (atid->isfiltered)
4871 ath_tx_tid_filt_comp_complete(sc, atid);
4874 * Punt cleanup to the relevant function, not our problem now
4876 if (atid->cleanup_inprogress) {
4877 if (atid->isfiltered)
4878 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4879 "%s: isfiltered=1, normal_comp?\n",
4882 ath_tx_comp_cleanup_aggr(sc, bf_first);
4887 * If the frame is filtered, transition to filtered frame
4888 * mode and add this to the filtered frame list.
4890 * XXX TODO: figure out how this interoperates with
4891 * BAR, pause and cleanup states.
4893 if ((ts.ts_status & HAL_TXERR_FILT) ||
4894 (ts.ts_status != 0 && atid->isfiltered)) {
4896 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4897 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4898 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4900 /* Remove from BAW */
4901 TAILQ_FOREACH_SAFE(bf, &bf_cq, bf_list, bf_next) {
4902 if (bf->bf_state.bfs_addedbaw)
4904 if (bf->bf_state.bfs_dobaw) {
4905 ath_tx_update_baw(sc, an, atid, bf);
4906 if (!bf->bf_state.bfs_addedbaw)
4907 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4908 "%s: wasn't added: seqno %d\n",
4910 SEQNO(bf->bf_state.bfs_seqno));
4912 bf->bf_state.bfs_dobaw = 0;
4915 * If any intermediate frames in the BAW were dropped when
4916 * handling filtering things, send a BAR.
4919 ath_tx_tid_bar_suspend(sc, atid);
4922 * Finish up by sending a BAR if required and freeing
4923 * the frames outside of the TX lock.
4925 goto finish_send_bar;
4929 * XXX for now, use the first frame in the aggregate for
4930 * XXX rate control completion; it's at least consistent.
4932 pktlen = bf_first->bf_state.bfs_pktlen;
4935 * Handle errors first!
4937 * Here, handle _any_ error as a "exceeded retries" error.
4938 * Later on (when filtered frames are to be specially handled)
4939 * it'll have to be expanded.
4942 if (ts.ts_status & HAL_TXERR_XRETRY) {
4944 if (ts.ts_status != 0) {
4946 ath_tx_comp_aggr_error(sc, bf_first, atid);
4950 tap = ath_tx_get_tx_tid(an, tid);
4953 * extract starting sequence and block-ack bitmap
4955 /* XXX endian-ness of seq_st, ba? */
4956 seq_st = ts.ts_seqnum;
4957 hasba = !! (ts.ts_flags & HAL_TX_BA);
4958 tx_ok = (ts.ts_status == 0);
4959 isaggr = bf_first->bf_state.bfs_aggr;
4960 ba[0] = ts.ts_ba_low;
4961 ba[1] = ts.ts_ba_high;
4964 * Copy the TX completion status and the rate control
4965 * series from the first descriptor, as it may be freed
4966 * before the rate control code can get its grubby fingers
4969 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4971 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4972 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4973 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4974 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4975 isaggr, seq_st, hasba, ba[0], ba[1]);
4978 * The reference driver doesn't do this; it simply ignores
4979 * this check in its entirety.
4981 * I've seen this occur when using iperf to send traffic
4982 * out tid 1 - the aggregate frames are all marked as TID 1,
4983 * but the TXSTATUS has TID=0. So, let's just ignore this
4987 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4988 if (tid != ts.ts_tid) {
4989 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4990 __func__, tid, ts.ts_tid);
4995 /* AR5416 BA bug; this requires an interface reset */
4996 if (isaggr && tx_ok && (! hasba)) {
4997 device_printf(sc->sc_dev,
4998 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
5000 __func__, hasba, tx_ok, isaggr, seq_st);
5001 /* XXX TODO: schedule an interface reset */
5003 ath_printtxbuf(sc, bf_first,
5004 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
5009 * Walk the list of frames, figure out which ones were correctly
5010 * sent and which weren't.
5013 nf = bf_first->bf_state.bfs_nframes;
5015 /* bf_first is going to be invalid once this list is walked */
5019 * Walk the list of completed frames and determine
5020 * which need to be completed and which need to be
5023 * For completed frames, the completion functions need
5024 * to be called at the end of this function as the last
5025 * node reference may free the node.
5027 * Finally, since the TXQ lock can't be held during the
5028 * completion callback (to avoid lock recursion),
5029 * the completion calls have to be done outside of the
5034 ba_index = ATH_BA_INDEX(seq_st,
5035 SEQNO(bf->bf_state.bfs_seqno));
5036 bf_next = bf->bf_next;
5037 bf->bf_next = NULL; /* Remove it from the aggr list */
5039 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5040 "%s: checking bf=%p seqno=%d; ack=%d\n",
5041 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
5042 ATH_BA_ISSET(ba, ba_index));
5044 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
5045 sc->sc_stats.ast_tx_aggr_ok++;
5046 ath_tx_update_baw(sc, an, atid, bf);
5047 bf->bf_state.bfs_dobaw = 0;
5048 if (!bf->bf_state.bfs_addedbaw)
5049 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5050 "%s: wasn't added: seqno %d\n",
5051 __func__, SEQNO(bf->bf_state.bfs_seqno));
5053 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
5055 sc->sc_stats.ast_tx_aggr_fail++;
5056 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
5059 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
5067 * Now that the BAW updates have been done, unlock
5069 * txseq is grabbed before the lock is released so we
5070 * have a consistent view of what -was- in the BAW.
5071 * Anything after this point will not yet have been
5074 txseq = tap->txa_start;
5078 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5079 "%s: num frames seen=%d; bf nframes=%d\n",
5080 __func__, nframes, nf);
5083 * Now we know how many frames were bad, call the rate
5087 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
5091 * send bar if we dropped any frames
5094 /* Suspend the TX queue and get ready to send the BAR */
5096 ath_tx_tid_bar_suspend(sc, atid);
5100 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5101 "%s: txa_start now %d\n", __func__, tap->txa_start);
5105 /* Prepend all frames to the beginning of the queue */
5106 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
5107 TAILQ_REMOVE(&bf_q, bf, bf_list);
5108 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
5112 * Reschedule to grab some further frames.
5114 ath_tx_tid_sched(sc, atid);
5117 * If the queue is filtered, re-schedule as required.
5119 * This is required as there may be a subsequent TX descriptor
5120 * for this end-node that has CLRDMASK set, so it's quite possible
5121 * that a filtered frame will be followed by a non-filtered
5122 * (complete or otherwise) frame.
5124 * XXX should we do this before we complete the frame?
5126 if (atid->isfiltered)
5127 ath_tx_tid_filt_comp_complete(sc, atid);
5132 * Send BAR if required
5134 if (ath_tx_tid_bar_tx_ready(sc, atid))
5135 ath_tx_tid_bar_tx(sc, atid);
5139 /* Do deferred completion */
5140 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5141 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5142 ath_tx_default_comp(sc, bf, 0);
5147 * Handle completion of unaggregated frames in an ADDBA
5150 * Fail is set to 1 if the entry is being freed via a call to
5151 * ath_tx_draintxq().
5154 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
5156 struct ieee80211_node *ni = bf->bf_node;
5157 struct ath_node *an = ATH_NODE(ni);
5158 int tid = bf->bf_state.bfs_tid;
5159 struct ath_tid *atid = &an->an_tid[tid];
5160 struct ath_tx_status ts;
5164 * Take a copy of this; filtering/cloning the frame may free the
5167 ts = bf->bf_status.ds_txstat;
5170 * Update rate control status here, before we possibly
5171 * punt to retry or cleanup.
5173 * Do it outside of the TXQ lock.
5175 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
5176 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
5177 &bf->bf_status.ds_txstat,
5178 bf->bf_state.bfs_pktlen,
5179 1, (ts.ts_status == 0) ? 0 : 1);
5182 * This is called early so atid->hwq_depth can be tracked.
5183 * This unfortunately means that it's released and regrabbed
5184 * during retry and cleanup. That's rather inefficient.
5188 if (tid == IEEE80211_NONQOS_TID)
5189 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
5191 DPRINTF(sc, ATH_DEBUG_SW_TX,
5192 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
5193 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
5194 SEQNO(bf->bf_state.bfs_seqno));
5197 if (atid->hwq_depth < 0)
5198 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
5199 __func__, atid->hwq_depth);
5202 * If the TID is filtered, handle completing the filter
5203 * transition before potentially kicking it to the cleanup
5206 if (atid->isfiltered)
5207 ath_tx_tid_filt_comp_complete(sc, atid);
5210 * If a cleanup is in progress, punt to comp_cleanup;
5211 * rather than handling it here. It's thus their
5212 * responsibility to clean up, call the completion
5213 * function in net80211, etc.
5215 if (atid->cleanup_inprogress) {
5216 if (atid->isfiltered)
5217 DPRINTF(sc, ATH_DEBUG_SW_TX,
5218 "%s: isfiltered=1, normal_comp?\n",
5221 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
5223 ath_tx_comp_cleanup_unaggr(sc, bf);
5228 * XXX TODO: how does cleanup, BAR and filtered frame handling
5231 * If the frame is filtered OR if it's any failure but
5232 * the TID is filtered, the frame must be added to the
5233 * filtered frame list.
5235 * However - a busy buffer can't be added to the filtered
5236 * list as it will end up being recycled without having
5237 * been made available for the hardware.
5239 if ((ts.ts_status & HAL_TXERR_FILT) ||
5240 (ts.ts_status != 0 && atid->isfiltered)) {
5244 DPRINTF(sc, ATH_DEBUG_SW_TX,
5245 "%s: isfiltered=1, fail=%d\n",
5247 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5249 * If freeframe=0 then bf is no longer ours; don't
5253 /* Remove from BAW */
5254 if (bf->bf_state.bfs_addedbaw)
5256 if (bf->bf_state.bfs_dobaw) {
5257 ath_tx_update_baw(sc, an, atid, bf);
5258 if (!bf->bf_state.bfs_addedbaw)
5259 DPRINTF(sc, ATH_DEBUG_SW_TX,
5260 "%s: wasn't added: seqno %d\n",
5261 __func__, SEQNO(bf->bf_state.bfs_seqno));
5263 bf->bf_state.bfs_dobaw = 0;
5267 * If the frame couldn't be filtered, treat it as a drop and
5268 * prepare to send a BAR.
5270 if (freeframe && drops)
5271 ath_tx_tid_bar_suspend(sc, atid);
5274 * Send BAR if required
5276 if (ath_tx_tid_bar_tx_ready(sc, atid))
5277 ath_tx_tid_bar_tx(sc, atid);
5281 * If freeframe is set, then the frame couldn't be
5282 * cloned and bf is still valid. Just complete/free it.
5285 ath_tx_default_comp(sc, bf, fail);
5290 * Don't bother with the retry check if all frames
5291 * are being failed (eg during queue deletion.)
5294 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5296 if (fail == 0 && ts.ts_status != 0) {
5298 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5300 ath_tx_aggr_retry_unaggr(sc, bf);
5304 /* Success? Complete */
5305 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5306 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5307 if (bf->bf_state.bfs_dobaw) {
5308 ath_tx_update_baw(sc, an, atid, bf);
5309 bf->bf_state.bfs_dobaw = 0;
5310 if (!bf->bf_state.bfs_addedbaw)
5311 DPRINTF(sc, ATH_DEBUG_SW_TX,
5312 "%s: wasn't added: seqno %d\n",
5313 __func__, SEQNO(bf->bf_state.bfs_seqno));
5317 * If the queue is filtered, re-schedule as required.
5319 * This is required as there may be a subsequent TX descriptor
5320 * for this end-node that has CLRDMASK set, so it's quite possible
5321 * that a filtered frame will be followed by a non-filtered
5322 * (complete or otherwise) frame.
5324 * XXX should we do this before we complete the frame?
5326 if (atid->isfiltered)
5327 ath_tx_tid_filt_comp_complete(sc, atid);
5330 * Send BAR if required
5332 if (ath_tx_tid_bar_tx_ready(sc, atid))
5333 ath_tx_tid_bar_tx(sc, atid);
5337 ath_tx_default_comp(sc, bf, fail);
5338 /* bf is freed at this point */
5342 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5344 if (bf->bf_state.bfs_aggr)
5345 ath_tx_aggr_comp_aggr(sc, bf, fail);
5347 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5351 * Schedule some packets from the given node/TID to the hardware.
5353 * This is the aggregate version.
5356 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5357 struct ath_tid *tid)
5360 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5361 struct ieee80211_tx_ampdu *tap;
5362 ATH_AGGR_STATUS status;
5365 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5366 ATH_TX_LOCK_ASSERT(sc);
5369 * XXX TODO: If we're called for a queue that we're leaking frames to,
5370 * ensure we only leak one.
5373 tap = ath_tx_get_tx_tid(an, tid->tid);
5375 if (tid->tid == IEEE80211_NONQOS_TID)
5376 DPRINTF(sc, ATH_DEBUG_SW_TX,
5377 "%s: called for TID=NONQOS_TID?\n", __func__);
5380 status = ATH_AGGR_DONE;
5383 * If the upper layer has paused the TID, don't
5384 * queue any further packets.
5386 * This can also occur from the completion task because
5387 * of packet loss; but as its serialised with this code,
5388 * it won't "appear" half way through queuing packets.
5390 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5393 bf = ATH_TID_FIRST(tid);
5399 * If the packet doesn't fall within the BAW (eg a NULL
5400 * data frame), schedule it directly; continue.
5402 if (! bf->bf_state.bfs_dobaw) {
5403 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5404 "%s: non-baw packet\n",
5406 ATH_TID_REMOVE(tid, bf, bf_list);
5408 if (bf->bf_state.bfs_nframes > 1)
5409 DPRINTF(sc, ATH_DEBUG_SW_TX,
5410 "%s: aggr=%d, nframes=%d\n",
5412 bf->bf_state.bfs_aggr,
5413 bf->bf_state.bfs_nframes);
5416 * This shouldn't happen - such frames shouldn't
5417 * ever have been queued as an aggregate in the
5418 * first place. However, make sure the fields
5419 * are correctly setup just to be totally sure.
5421 bf->bf_state.bfs_aggr = 0;
5422 bf->bf_state.bfs_nframes = 1;
5424 /* Update CLRDMASK just before this frame is queued */
5425 ath_tx_update_clrdmask(sc, tid, bf);
5427 ath_tx_do_ratelookup(sc, bf);
5428 ath_tx_calc_duration(sc, bf);
5429 ath_tx_calc_protection(sc, bf);
5430 ath_tx_set_rtscts(sc, bf);
5431 ath_tx_rate_fill_rcflags(sc, bf);
5432 ath_tx_setds(sc, bf);
5433 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5435 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5437 /* Queue the packet; continue */
5444 * Do a rate control lookup on the first frame in the
5445 * list. The rate control code needs that to occur
5446 * before it can determine whether to TX.
5447 * It's inaccurate because the rate control code doesn't
5448 * really "do" aggregate lookups, so it only considers
5449 * the size of the first frame.
5451 ath_tx_do_ratelookup(sc, bf);
5452 bf->bf_state.bfs_rc[3].rix = 0;
5453 bf->bf_state.bfs_rc[3].tries = 0;
5455 ath_tx_calc_duration(sc, bf);
5456 ath_tx_calc_protection(sc, bf);
5458 ath_tx_set_rtscts(sc, bf);
5459 ath_tx_rate_fill_rcflags(sc, bf);
5461 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5463 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5464 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5467 * No frames to be picked up - out of BAW
5469 if (TAILQ_EMPTY(&bf_q))
5473 * This assumes that the descriptor list in the ath_bufhead
5474 * are already linked together via bf_next pointers.
5476 bf = TAILQ_FIRST(&bf_q);
5478 if (status == ATH_AGGR_8K_LIMITED)
5479 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5482 * If it's the only frame send as non-aggregate
5483 * assume that ath_tx_form_aggr() has checked
5484 * whether it's in the BAW and added it appropriately.
5486 if (bf->bf_state.bfs_nframes == 1) {
5487 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5488 "%s: single-frame aggregate\n", __func__);
5490 /* Update CLRDMASK just before this frame is queued */
5491 ath_tx_update_clrdmask(sc, tid, bf);
5493 bf->bf_state.bfs_aggr = 0;
5494 bf->bf_state.bfs_ndelim = 0;
5495 ath_tx_setds(sc, bf);
5496 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5497 if (status == ATH_AGGR_BAW_CLOSED)
5498 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5500 sc->sc_aggr_stats.aggr_single_pkt++;
5502 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5503 "%s: multi-frame aggregate: %d frames, "
5505 __func__, bf->bf_state.bfs_nframes,
5506 bf->bf_state.bfs_al);
5507 bf->bf_state.bfs_aggr = 1;
5508 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5509 sc->sc_aggr_stats.aggr_aggr_pkt++;
5511 /* Update CLRDMASK just before this frame is queued */
5512 ath_tx_update_clrdmask(sc, tid, bf);
5515 * Calculate the duration/protection as required.
5517 ath_tx_calc_duration(sc, bf);
5518 ath_tx_calc_protection(sc, bf);
5521 * Update the rate and rtscts information based on the
5522 * rate decision made by the rate control code;
5523 * the first frame in the aggregate needs it.
5525 ath_tx_set_rtscts(sc, bf);
5528 * Setup the relevant descriptor fields
5529 * for aggregation. The first descriptor
5530 * already points to the rest in the chain.
5532 ath_tx_setds_11n(sc, bf);
5536 /* Set completion handler, multi-frame aggregate or not */
5537 bf->bf_comp = ath_tx_aggr_comp;
5539 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5540 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5543 * Update leak count and frame config if were leaking frames.
5545 * XXX TODO: it should update all frames in an aggregate
5548 ath_tx_leak_count_update(sc, tid, bf);
5551 ath_tx_handoff(sc, txq, bf);
5553 /* Track outstanding buffer count to hardware */
5554 /* aggregates are "one" buffer */
5558 * Break out if ath_tx_form_aggr() indicated
5559 * there can't be any further progress (eg BAW is full.)
5560 * Checking for an empty txq is done above.
5562 * XXX locking on txq here?
5564 /* XXX TXQ locking */
5565 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5566 (status == ATH_AGGR_BAW_CLOSED ||
5567 status == ATH_AGGR_LEAK_CLOSED))
5573 * Schedule some packets from the given node/TID to the hardware.
5575 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5576 * It just dumps frames into the TXQ. We should limit how deep
5577 * the transmit queue can grow for frames dispatched to the given
5580 * To avoid locking issues, either we need to own the TXQ lock
5581 * at this point, or we need to pass in the maximum frame count
5585 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5586 struct ath_tid *tid)
5589 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5591 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5592 __func__, an, tid->tid);
5594 ATH_TX_LOCK_ASSERT(sc);
5596 /* Check - is AMPDU pending or running? then print out something */
5597 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5598 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5599 __func__, tid->tid);
5600 if (ath_tx_ampdu_running(sc, an, tid->tid))
5601 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5602 __func__, tid->tid);
5607 * If the upper layers have paused the TID, don't
5608 * queue any further packets.
5610 * XXX if we are leaking frames, make sure we decrement
5611 * that counter _and_ we continue here.
5613 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5616 bf = ATH_TID_FIRST(tid);
5621 ATH_TID_REMOVE(tid, bf, bf_list);
5624 if (tid->tid != bf->bf_state.bfs_tid) {
5625 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5626 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5629 /* Normal completion handler */
5630 bf->bf_comp = ath_tx_normal_comp;
5633 * Override this for now, until the non-aggregate
5634 * completion handler correctly handles software retransmits.
5636 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5638 /* Update CLRDMASK just before this frame is queued */
5639 ath_tx_update_clrdmask(sc, tid, bf);
5641 /* Program descriptors + rate control */
5642 ath_tx_do_ratelookup(sc, bf);
5643 ath_tx_calc_duration(sc, bf);
5644 ath_tx_calc_protection(sc, bf);
5645 ath_tx_set_rtscts(sc, bf);
5646 ath_tx_rate_fill_rcflags(sc, bf);
5647 ath_tx_setds(sc, bf);
5650 * Update the current leak count if
5651 * we're leaking frames; and set the
5652 * MORE flag as appropriate.
5654 ath_tx_leak_count_update(sc, tid, bf);
5656 /* Track outstanding buffer count to hardware */
5657 /* aggregates are "one" buffer */
5660 /* Punt to hardware or software txq */
5661 ath_tx_handoff(sc, txq, bf);
5666 * Schedule some packets to the given hardware queue.
5668 * This function walks the list of TIDs (ie, ath_node TIDs
5669 * with queued traffic) and attempts to schedule traffic
5672 * TID scheduling is implemented as a FIFO, with TIDs being
5673 * added to the end of the queue after some frames have been
5677 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5679 struct ath_tid *tid, *next, *last;
5681 ATH_TX_LOCK_ASSERT(sc);
5684 * For non-EDMA chips, aggr frames that have been built are
5685 * in axq_aggr_depth, whether they've been scheduled or not.
5686 * There's no FIFO, so txq->axq_depth is what's been scheduled
5689 * For EDMA chips, we do it in two stages. The existing code
5690 * builds a list of frames to go to the hardware and the EDMA
5691 * code turns it into a single entry to push into the FIFO.
5692 * That way we don't take up one packet per FIFO slot.
5693 * We do push one aggregate per FIFO slot though, just to keep
5696 * The FIFO depth is what's in the hardware; the txq->axq_depth
5697 * is what's been scheduled to the FIFO.
5699 * fifo.axq_depth is the number of frames (or aggregates) pushed
5700 * into the EDMA FIFO. For multi-frame lists, this is the number
5701 * of frames pushed in.
5702 * axq_fifo_depth is the number of FIFO slots currently busy.
5705 /* For EDMA and non-EDMA, check built/scheduled against aggr limit */
5706 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr) {
5707 sc->sc_aggr_stats.aggr_sched_nopkt++;
5712 * For non-EDMA chips, axq_depth is the "what's scheduled to
5713 * the hardware list". For EDMA it's "What's built for the hardware"
5714 * and fifo.axq_depth is how many frames have been dispatched
5715 * already to the hardware.
5717 if (txq->axq_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_nonaggr) {
5718 sc->sc_aggr_stats.aggr_sched_nopkt++;
5722 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5724 TAILQ_FOREACH_SAFE(tid, &txq->axq_tidq, axq_qelem, next) {
5726 * Suspend paused queues here; they'll be resumed
5727 * once the addba completes or times out.
5729 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5730 __func__, tid->tid, tid->paused);
5731 ath_tx_tid_unsched(sc, tid);
5733 * This node may be in power-save and we're leaking
5734 * a frame; be careful.
5736 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5739 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5740 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5742 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5744 /* Not empty? Re-schedule */
5745 if (tid->axq_depth != 0)
5746 ath_tx_tid_sched(sc, tid);
5749 * Give the software queue time to aggregate more
5750 * packets. If we aren't running aggregation then
5751 * we should still limit the hardware queue depth.
5753 /* XXX TXQ locking */
5754 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5757 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5762 * If this was the last entry on the original list, stop.
5763 * Otherwise nodes that have been rescheduled onto the end
5764 * of the TID FIFO list will just keep being rescheduled.
5766 * XXX What should we do about nodes that were paused
5767 * but are pending a leaking frame in response to a ps-poll?
5768 * They'll be put at the front of the list; so they'll
5769 * prematurely trigger this condition! Ew.
5781 * Return net80211 TID struct pointer, or NULL for none
5783 struct ieee80211_tx_ampdu *
5784 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5786 struct ieee80211_node *ni = &an->an_node;
5787 struct ieee80211_tx_ampdu *tap;
5789 if (tid == IEEE80211_NONQOS_TID)
5792 tap = &ni->ni_tx_ampdu[tid];
5797 * Is AMPDU-TX running?
5800 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5802 struct ieee80211_tx_ampdu *tap;
5804 if (tid == IEEE80211_NONQOS_TID)
5807 tap = ath_tx_get_tx_tid(an, tid);
5809 return 0; /* Not valid; default to not running */
5811 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5815 * Is AMPDU-TX negotiation pending?
5818 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5820 struct ieee80211_tx_ampdu *tap;
5822 if (tid == IEEE80211_NONQOS_TID)
5825 tap = ath_tx_get_tx_tid(an, tid);
5827 return 0; /* Not valid; default to not pending */
5829 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5833 * Is AMPDU-TX pending for the given TID?
5838 * Method to handle sending an ADDBA request.
5840 * We tap this so the relevant flags can be set to pause the TID
5841 * whilst waiting for the response.
5843 * XXX there's no timeout handler we can override?
5846 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5847 int dialogtoken, int baparamset, int batimeout)
5849 struct ath_softc *sc = ni->ni_ic->ic_softc;
5850 int tid = tap->txa_tid;
5851 struct ath_node *an = ATH_NODE(ni);
5852 struct ath_tid *atid = &an->an_tid[tid];
5855 * XXX danger Will Robinson!
5857 * Although the taskqueue may be running and scheduling some more
5858 * packets, these should all be _before_ the addba sequence number.
5859 * However, net80211 will keep self-assigning sequence numbers
5860 * until addba has been negotiated.
5862 * In the past, these packets would be "paused" (which still works
5863 * fine, as they're being scheduled to the driver in the same
5864 * serialised method which is calling the addba request routine)
5865 * and when the aggregation session begins, they'll be dequeued
5866 * as aggregate packets and added to the BAW. However, now there's
5867 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5868 * packets. Thus they never get included in the BAW tracking and
5869 * this can cause the initial burst of packets after the addba
5870 * negotiation to "hang", as they quickly fall outside the BAW.
5872 * The "eventual" solution should be to tag these packets with
5873 * dobaw. Although net80211 has given us a sequence number,
5874 * it'll be "after" the left edge of the BAW and thus it'll
5879 * This is a bit annoying. Until net80211 HT code inherits some
5880 * (any) locking, we may have this called in parallel BUT only
5881 * one response/timeout will be called. Grr.
5883 if (atid->addba_tx_pending == 0) {
5884 ath_tx_tid_pause(sc, atid);
5885 atid->addba_tx_pending = 1;
5889 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5890 "%s: %6D: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5894 dialogtoken, baparamset, batimeout);
5895 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5896 "%s: txa_start=%d, ni_txseqs=%d\n",
5897 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5899 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5904 * Handle an ADDBA response.
5906 * We unpause the queue so TX'ing can resume.
5908 * Any packets TX'ed from this point should be "aggregate" (whether
5909 * aggregate or not) so the BAW is updated.
5911 * Note! net80211 keeps self-assigning sequence numbers until
5912 * ampdu is negotiated. This means the initially-negotiated BAW left
5913 * edge won't match the ni->ni_txseq.
5915 * So, being very dirty, the BAW left edge is "slid" here to match
5918 * What likely SHOULD happen is that all packets subsequent to the
5919 * addba request should be tagged as aggregate and queued as non-aggregate
5920 * frames; thus updating the BAW. For now though, I'll just slide the
5924 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5925 int status, int code, int batimeout)
5927 struct ath_softc *sc = ni->ni_ic->ic_softc;
5928 int tid = tap->txa_tid;
5929 struct ath_node *an = ATH_NODE(ni);
5930 struct ath_tid *atid = &an->an_tid[tid];
5933 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5934 "%s: %6D: called; status=%d, code=%d, batimeout=%d\n", __func__,
5937 status, code, batimeout);
5939 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5940 "%s: txa_start=%d, ni_txseqs=%d\n",
5941 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5944 * Call this first, so the interface flags get updated
5945 * before the TID is unpaused. Otherwise a race condition
5946 * exists where the unpaused TID still doesn't yet have
5947 * IEEE80211_AGGR_RUNNING set.
5949 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5952 atid->addba_tx_pending = 0;
5955 * Slide the BAW left edge to wherever net80211 left it for us.
5956 * Read above for more information.
5958 tap->txa_start = ni->ni_txseqs[tid];
5959 ath_tx_tid_resume(sc, atid);
5966 * Stop ADDBA on a queue.
5968 * This can be called whilst BAR TX is currently active on the queue,
5969 * so make sure this is unblocked before continuing.
5972 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5974 struct ath_softc *sc = ni->ni_ic->ic_softc;
5975 int tid = tap->txa_tid;
5976 struct ath_node *an = ATH_NODE(ni);
5977 struct ath_tid *atid = &an->an_tid[tid];
5981 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %6D: called\n",
5987 * Pause TID traffic early, so there aren't any races
5988 * Unblock the pending BAR held traffic, if it's currently paused.
5991 ath_tx_tid_pause(sc, atid);
5992 if (atid->bar_wait) {
5994 * bar_unsuspend() expects bar_tx == 1, as it should be
5995 * called from the TX completion path. This quietens
5996 * the warning. It's cleared for us anyway.
5999 ath_tx_tid_bar_unsuspend(sc, atid);
6003 /* There's no need to hold the TXQ lock here */
6004 sc->sc_addba_stop(ni, tap);
6007 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
6008 * it'll set the cleanup flag, and it'll be unpaused once
6009 * things have been cleaned up.
6015 * In case there's a followup call to this, only call it
6016 * if we don't have a cleanup in progress.
6018 * Since we've paused the queue above, we need to make
6019 * sure we unpause if there's already a cleanup in
6020 * progress - it means something else is also doing
6021 * this stuff, so we don't need to also keep it paused.
6023 if (atid->cleanup_inprogress) {
6024 ath_tx_tid_resume(sc, atid);
6026 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
6028 * Unpause the TID if no cleanup is required.
6030 if (! atid->cleanup_inprogress)
6031 ath_tx_tid_resume(sc, atid);
6035 /* Handle completing frames and fail them */
6036 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
6037 TAILQ_REMOVE(&bf_cq, bf, bf_list);
6038 ath_tx_default_comp(sc, bf, 1);
6044 * Handle a node reassociation.
6046 * We may have a bunch of frames queued to the hardware; those need
6047 * to be marked as cleanup.
6050 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
6052 struct ath_tid *tid;
6059 ATH_TX_UNLOCK_ASSERT(sc);
6062 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
6063 tid = &an->an_tid[i];
6064 if (tid->hwq_depth == 0)
6066 DPRINTF(sc, ATH_DEBUG_NODE,
6067 "%s: %6D: TID %d: cleaning up TID\n",
6069 an->an_node.ni_macaddr,
6073 * In case there's a followup call to this, only call it
6074 * if we don't have a cleanup in progress.
6076 if (! tid->cleanup_inprogress) {
6077 ath_tx_tid_pause(sc, tid);
6078 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
6080 * Unpause the TID if no cleanup is required.
6082 if (! tid->cleanup_inprogress)
6083 ath_tx_tid_resume(sc, tid);
6088 /* Handle completing frames and fail them */
6089 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
6090 TAILQ_REMOVE(&bf_cq, bf, bf_list);
6091 ath_tx_default_comp(sc, bf, 1);
6096 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
6097 * it simply tears down the aggregation session. Ew.
6099 * It however will call ieee80211_ampdu_stop() which will call
6100 * ic->ic_addba_stop().
6102 * XXX This uses a hard-coded max BAR count value; the whole
6103 * XXX BAR TX success or failure should be better handled!
6106 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
6109 struct ath_softc *sc = ni->ni_ic->ic_softc;
6110 int tid = tap->txa_tid;
6111 struct ath_node *an = ATH_NODE(ni);
6112 struct ath_tid *atid = &an->an_tid[tid];
6113 int attempts = tap->txa_attempts;
6116 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6117 "%s: %6D: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d, txa_start=%d, txa_seqpending=%d\n",
6126 tap->txa_seqpending);
6128 /* Note: This may update the BAW details */
6130 * XXX What if this does slide the BAW along? We need to somehow
6131 * XXX either fix things when it does happen, or prevent the
6132 * XXX seqpending value to be anything other than exactly what
6133 * XXX the hell we want!
6135 * XXX So for now, how I do this inside the TX lock for now
6136 * XXX and just correct it afterwards? The below condition should
6137 * XXX never happen and if it does I need to fix all kinds of things.
6140 old_txa_start = tap->txa_start;
6141 sc->sc_bar_response(ni, tap, status);
6142 if (tap->txa_start != old_txa_start) {
6143 device_printf(sc->sc_dev, "%s: tid=%d; txa_start=%d, old=%d, adjusting\n",
6149 tap->txa_start = old_txa_start;
6152 /* Unpause the TID */
6154 * XXX if this is attempt=50, the TID will be downgraded
6155 * XXX to a non-aggregate session. So we must unpause the
6156 * XXX TID here or it'll never be done.
6158 * Also, don't call it if bar_tx/bar_wait are 0; something
6159 * has beaten us to the punch? (XXX figure out what?)
6161 if (status == 0 || attempts == 50) {
6163 if (atid->bar_tx == 0 || atid->bar_wait == 0)
6164 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6165 "%s: huh? bar_tx=%d, bar_wait=%d\n",
6167 atid->bar_tx, atid->bar_wait);
6169 ath_tx_tid_bar_unsuspend(sc, atid);
6175 * This is called whenever the pending ADDBA request times out.
6176 * Unpause and reschedule the TID.
6179 ath_addba_response_timeout(struct ieee80211_node *ni,
6180 struct ieee80211_tx_ampdu *tap)
6182 struct ath_softc *sc = ni->ni_ic->ic_softc;
6183 int tid = tap->txa_tid;
6184 struct ath_node *an = ATH_NODE(ni);
6185 struct ath_tid *atid = &an->an_tid[tid];
6187 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
6188 "%s: %6D: TID=%d, called; resuming\n",
6195 atid->addba_tx_pending = 0;
6198 /* Note: This updates the aggregate state to (again) pending */
6199 sc->sc_addba_response_timeout(ni, tap);
6201 /* Unpause the TID; which reschedules it */
6203 ath_tx_tid_resume(sc, atid);
6208 * Check if a node is asleep or not.
6211 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
6214 ATH_TX_LOCK_ASSERT(sc);
6216 return (an->an_is_powersave);
6220 * Mark a node as currently "in powersaving."
6221 * This suspends all traffic on the node.
6223 * This must be called with the node/tx locks free.
6225 * XXX TODO: the locking silliness below is due to how the node
6226 * locking currently works. Right now, the node lock is grabbed
6227 * to do rate control lookups and these are done with the TX
6228 * queue lock held. This means the node lock can't be grabbed
6229 * first here or a LOR will occur.
6231 * Eventually (hopefully!) the TX path code will only grab
6232 * the TXQ lock when transmitting and the ath_node lock when
6233 * doing node/TID operations. There are other complications -
6234 * the sched/unsched operations involve walking the per-txq
6235 * 'active tid' list and this requires both locks to be held.
6238 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
6240 struct ath_tid *atid;
6241 struct ath_txq *txq;
6244 ATH_TX_UNLOCK_ASSERT(sc);
6246 /* Suspend all traffic on the node */
6249 if (an->an_is_powersave) {
6250 DPRINTF(sc, ATH_DEBUG_XMIT,
6251 "%s: %6D: node was already asleep!\n",
6252 __func__, an->an_node.ni_macaddr, ":");
6257 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6258 atid = &an->an_tid[tid];
6259 txq = sc->sc_ac2q[atid->ac];
6261 ath_tx_tid_pause(sc, atid);
6264 /* Mark node as in powersaving */
6265 an->an_is_powersave = 1;
6271 * Mark a node as currently "awake."
6272 * This resumes all traffic to the node.
6275 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
6277 struct ath_tid *atid;
6278 struct ath_txq *txq;
6281 ATH_TX_UNLOCK_ASSERT(sc);
6286 if (an->an_is_powersave == 0) {
6288 DPRINTF(sc, ATH_DEBUG_XMIT,
6289 "%s: an=%p: node was already awake\n",
6294 /* Mark node as awake */
6295 an->an_is_powersave = 0;
6297 * Clear any pending leaked frame requests
6299 an->an_leak_count = 0;
6301 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6302 atid = &an->an_tid[tid];
6303 txq = sc->sc_ac2q[atid->ac];
6305 ath_tx_tid_resume(sc, atid);
6311 ath_legacy_dma_txsetup(struct ath_softc *sc)
6314 /* nothing new needed */
6319 ath_legacy_dma_txteardown(struct ath_softc *sc)
6322 /* nothing new needed */
6327 ath_xmit_setup_legacy(struct ath_softc *sc)
6330 * For now, just set the descriptor length to sizeof(ath_desc);
6331 * worry about extracting the real length out of the HAL later.
6333 sc->sc_tx_desclen = sizeof(struct ath_desc);
6334 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6335 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6337 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6338 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6339 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6341 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6342 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6344 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;