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 need to go into TID 16 (IEEE80211_NONQOS_TID.)
178 * This has implications for which AC/priority the packet is placed
182 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
184 const struct ieee80211_frame *wh;
185 int pri = M_WME_GETAC(m0);
187 wh = mtod(m0, const struct ieee80211_frame *);
188 if (! IEEE80211_QOS_HAS_SEQ(wh))
189 return IEEE80211_NONQOS_TID;
191 return WME_AC_TO_TID(pri);
195 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
197 struct ieee80211_frame *wh;
199 wh = mtod(bf->bf_m, struct ieee80211_frame *);
200 /* Only update/resync if needed */
201 if (bf->bf_state.bfs_isretried == 0) {
202 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
203 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
204 BUS_DMASYNC_PREWRITE);
206 bf->bf_state.bfs_isretried = 1;
207 bf->bf_state.bfs_retries ++;
211 * Determine what the correct AC queue for the given frame
214 * This code assumes that the TIDs map consistently to
215 * the underlying hardware (or software) ath_txq.
216 * Since the sender may try to set an AC which is
217 * arbitrary, non-QoS TIDs may end up being put on
218 * completely different ACs. There's no way to put a
219 * TID into multiple ath_txq's for scheduling, so
220 * for now we override the AC/TXQ selection and set
221 * non-QOS TID frames into the BE queue.
223 * This may be completely incorrect - specifically,
224 * some management frames may end up out of order
225 * compared to the QoS traffic they're controlling.
226 * I'll look into this later.
229 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
231 const struct ieee80211_frame *wh;
232 int pri = M_WME_GETAC(m0);
233 wh = mtod(m0, const struct ieee80211_frame *);
234 if (IEEE80211_QOS_HAS_SEQ(wh))
237 return ATH_NONQOS_TID_AC;
241 ath_txfrag_cleanup(struct ath_softc *sc,
242 ath_bufhead *frags, struct ieee80211_node *ni)
244 struct ath_buf *bf, *next;
246 ATH_TXBUF_LOCK_ASSERT(sc);
248 TAILQ_FOREACH_SAFE(bf, frags, bf_list, next) {
249 /* NB: bf assumed clean */
250 TAILQ_REMOVE(frags, bf, bf_list);
251 ath_returnbuf_head(sc, bf);
252 ieee80211_node_decref(ni);
257 * Setup xmit of a fragmented frame. Allocate a buffer
258 * for each frag and bump the node reference count to
259 * reflect the held reference to be setup by ath_tx_start.
262 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
263 struct mbuf *m0, struct ieee80211_node *ni)
269 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
270 /* XXX non-management? */
271 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
272 if (bf == NULL) { /* out of buffers, cleanup */
273 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
275 ath_txfrag_cleanup(sc, frags, ni);
278 ieee80211_node_incref(ni);
279 TAILQ_INSERT_TAIL(frags, bf, bf_list);
281 ATH_TXBUF_UNLOCK(sc);
283 return !TAILQ_EMPTY(frags);
287 * Reclaim mbuf resources. For fragmented frames we
288 * need to claim each frag chained with m_nextpkt.
291 ath_freetx(struct mbuf *m)
299 } while ((m = next) != NULL);
303 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
309 * Load the DMA map so any coalescing is done. This
310 * also calculates the number of descriptors we need.
312 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
313 bf->bf_segs, &bf->bf_nseg,
315 if (error == EFBIG) {
316 /* XXX packet requires too many descriptors */
317 bf->bf_nseg = ATH_MAX_SCATTER + 1;
318 } else if (error != 0) {
319 sc->sc_stats.ast_tx_busdma++;
324 * Discard null packets and check for packets that
325 * require too many TX descriptors. We try to convert
326 * the latter to a cluster.
328 if (bf->bf_nseg > ATH_MAX_SCATTER) { /* too many desc's, linearize */
329 sc->sc_stats.ast_tx_linear++;
330 m = m_collapse(m0, M_NOWAIT, ATH_MAX_SCATTER);
333 sc->sc_stats.ast_tx_nombuf++;
337 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
338 bf->bf_segs, &bf->bf_nseg,
341 sc->sc_stats.ast_tx_busdma++;
345 KASSERT(bf->bf_nseg <= ATH_MAX_SCATTER,
346 ("too many segments after defrag; nseg %u", bf->bf_nseg));
347 } else if (bf->bf_nseg == 0) { /* null packet, discard */
348 sc->sc_stats.ast_tx_nodata++;
352 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
353 __func__, m0, m0->m_pkthdr.len);
354 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
361 * Chain together segments+descriptors for a frame - 11n or otherwise.
363 * For aggregates, this is called on each frame in the aggregate.
366 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
367 struct ath_buf *bf, int is_aggr, int is_first_subframe,
368 int is_last_subframe)
370 struct ath_hal *ah = sc->sc_ah;
373 HAL_DMA_ADDR bufAddrList[4];
374 uint32_t segLenList[4];
379 * XXX There's txdma and txdma_mgmt; the descriptor
382 struct ath_descdma *dd = &sc->sc_txdma;
385 * Fillin the remainder of the descriptor info.
389 * We need the number of TX data pointers in each descriptor.
390 * EDMA and later chips support 4 TX buffers per descriptor;
391 * previous chips just support one.
393 numTxMaps = sc->sc_tx_nmaps;
396 * For EDMA and later chips ensure the TX map is fully populated
397 * before advancing to the next descriptor.
399 ds = (char *) bf->bf_desc;
401 bzero(bufAddrList, sizeof(bufAddrList));
402 bzero(segLenList, sizeof(segLenList));
403 for (i = 0; i < bf->bf_nseg; i++) {
404 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
405 segLenList[bp] = bf->bf_segs[i].ds_len;
409 * Go to the next segment if this isn't the last segment
410 * and there's space in the current TX map.
412 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
416 * Last segment or we're out of buffer pointers.
420 if (i == bf->bf_nseg - 1)
421 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
423 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
424 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
427 * XXX This assumes that bfs_txq is the actual destination
428 * hardware queue at this point. It may not have been
429 * assigned, it may actually be pointing to the multicast
430 * software TXQ id. These must be fixed!
432 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
435 , bf->bf_descid /* XXX desc id */
436 , bf->bf_state.bfs_tx_queue
437 , isFirstDesc /* first segment */
438 , i == bf->bf_nseg - 1 /* last segment */
439 , (struct ath_desc *) ds0 /* first descriptor */
443 * Make sure the 11n aggregate fields are cleared.
445 * XXX TODO: this doesn't need to be called for
446 * aggregate frames; as it'll be called on all
447 * sub-frames. Since the descriptors are in
448 * non-cacheable memory, this leads to some
449 * rather slow writes on MIPS/ARM platforms.
451 if (ath_tx_is_11n(sc))
452 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
455 * If 11n is enabled, set it up as if it's an aggregate
458 if (is_last_subframe) {
459 ath_hal_set11n_aggr_last(sc->sc_ah,
460 (struct ath_desc *) ds);
461 } else if (is_aggr) {
463 * This clears the aggrlen field; so
464 * the caller needs to call set_aggr_first()!
466 * XXX TODO: don't call this for the first
467 * descriptor in the first frame in an
470 ath_hal_set11n_aggr_middle(sc->sc_ah,
471 (struct ath_desc *) ds,
472 bf->bf_state.bfs_ndelim);
475 bf->bf_lastds = (struct ath_desc *) ds;
478 * Don't forget to skip to the next descriptor.
480 ds += sc->sc_tx_desclen;
484 * .. and don't forget to blank these out!
486 bzero(bufAddrList, sizeof(bufAddrList));
487 bzero(segLenList, sizeof(segLenList));
489 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
493 * Set the rate control fields in the given descriptor based on
494 * the bf_state fields and node state.
496 * The bfs fields should already be set with the relevant rate
497 * control information, including whether MRR is to be enabled.
499 * Since the FreeBSD HAL currently sets up the first TX rate
500 * in ath_hal_setuptxdesc(), this will setup the MRR
501 * conditionally for the pre-11n chips, and call ath_buf_set_rate
502 * unconditionally for 11n chips. These require the 11n rate
503 * scenario to be set if MCS rates are enabled, so it's easier
504 * to just always call it. The caller can then only set rates 2, 3
505 * and 4 if multi-rate retry is needed.
508 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
511 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
513 /* If mrr is disabled, blank tries 1, 2, 3 */
514 if (! bf->bf_state.bfs_ismrr)
515 rc[1].tries = rc[2].tries = rc[3].tries = 0;
519 * If NOACK is set, just set ntries=1.
521 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
522 rc[1].tries = rc[2].tries = rc[3].tries = 0;
528 * Always call - that way a retried descriptor will
529 * have the MRR fields overwritten.
531 * XXX TODO: see if this is really needed - setting up
532 * the first descriptor should set the MRR fields to 0
535 if (ath_tx_is_11n(sc)) {
536 ath_buf_set_rate(sc, ni, bf);
538 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
539 , rc[1].ratecode, rc[1].tries
540 , rc[2].ratecode, rc[2].tries
541 , rc[3].ratecode, rc[3].tries
547 * Setup segments+descriptors for an 11n aggregate.
548 * bf_first is the first buffer in the aggregate.
549 * The descriptor list must already been linked together using
553 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
555 struct ath_buf *bf, *bf_prev = NULL;
556 struct ath_desc *ds0 = bf_first->bf_desc;
558 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
559 __func__, bf_first->bf_state.bfs_nframes,
560 bf_first->bf_state.bfs_al);
564 if (bf->bf_state.bfs_txrate0 == 0)
565 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
567 if (bf->bf_state.bfs_rc[0].ratecode == 0)
568 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
572 * Setup all descriptors of all subframes - this will
573 * call ath_hal_set11naggrmiddle() on every frame.
576 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
577 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
578 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
579 SEQNO(bf->bf_state.bfs_seqno));
582 * Setup the initial fields for the first descriptor - all
583 * the non-11n specific stuff.
585 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
586 , bf->bf_state.bfs_pktlen /* packet length */
587 , bf->bf_state.bfs_hdrlen /* header length */
588 , bf->bf_state.bfs_atype /* Atheros packet type */
589 , bf->bf_state.bfs_txpower /* txpower */
590 , bf->bf_state.bfs_txrate0
591 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
592 , bf->bf_state.bfs_keyix /* key cache index */
593 , bf->bf_state.bfs_txantenna /* antenna mode */
594 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
595 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
596 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
600 * First descriptor? Setup the rate control and initial
601 * aggregate header information.
603 if (bf == bf_first) {
605 * setup first desc with rate and aggr info
607 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
611 * Setup the descriptors for a multi-descriptor frame.
612 * This is both aggregate and non-aggregate aware.
614 ath_tx_chaindesclist(sc, ds0, bf,
616 !! (bf == bf_first), /* is_first_subframe */
617 !! (bf->bf_next == NULL) /* is_last_subframe */
620 if (bf == bf_first) {
622 * Initialise the first 11n aggregate with the
623 * aggregate length and aggregate enable bits.
625 ath_hal_set11n_aggr_first(sc->sc_ah,
628 bf->bf_state.bfs_ndelim);
632 * Link the last descriptor of the previous frame
633 * to the beginning descriptor of this frame.
636 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
639 /* Save a copy so we can link the next descriptor in */
645 * Set the first descriptor bf_lastds field to point to
646 * the last descriptor in the last subframe, that's where
647 * the status update will occur.
649 bf_first->bf_lastds = bf_prev->bf_lastds;
652 * And bf_last in the first descriptor points to the end of
653 * the aggregate list.
655 bf_first->bf_last = bf_prev;
658 * For non-AR9300 NICs, which require the rate control
659 * in the final descriptor - let's set that up now.
661 * This is because the filltxdesc() HAL call doesn't
662 * populate the last segment with rate control information
663 * if firstSeg is also true. For non-aggregate frames
664 * that is fine, as the first frame already has rate control
665 * info. But if the last frame in an aggregate has one
666 * descriptor, both firstseg and lastseg will be true and
667 * the rate info isn't copied.
669 * This is inefficient on MIPS/ARM platforms that have
670 * non-cachable memory for TX descriptors, but we'll just
673 * As to why the rate table is stashed in the last descriptor
674 * rather than the first descriptor? Because proctxdesc()
675 * is called on the final descriptor in an MPDU or A-MPDU -
676 * ie, the one that gets updated by the hardware upon
677 * completion. That way proctxdesc() doesn't need to know
678 * about the first _and_ last TX descriptor.
680 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
682 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
686 * Hand-off a frame to the multicast TX queue.
688 * This is a software TXQ which will be appended to the CAB queue
689 * during the beacon setup code.
691 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
692 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
693 * with the actual hardware txq, or all of this will fall apart.
695 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
696 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
700 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
703 ATH_TX_LOCK_ASSERT(sc);
705 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
706 ("%s: busy status 0x%x", __func__, bf->bf_flags));
709 * Ensure that the tx queue is the cabq, so things get
712 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
713 DPRINTF(sc, ATH_DEBUG_XMIT,
714 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
715 __func__, bf, bf->bf_state.bfs_tx_queue,
720 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
721 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
722 struct ieee80211_frame *wh;
724 /* mark previous frame */
725 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
726 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
727 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
728 BUS_DMASYNC_PREWRITE);
730 /* link descriptor */
731 ath_hal_settxdesclink(sc->sc_ah,
735 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
740 * Hand-off packet to a hardware queue.
743 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
746 struct ath_hal *ah = sc->sc_ah;
747 struct ath_buf *bf_first;
750 * Insert the frame on the outbound list and pass it on
751 * to the hardware. Multicast frames buffered for power
752 * save stations and transmit from the CAB queue are stored
753 * on a s/w only queue and loaded on to the CAB queue in
754 * the SWBA handler since frames only go out on DTIM and
755 * to avoid possible races.
757 ATH_TX_LOCK_ASSERT(sc);
758 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
759 ("%s: busy status 0x%x", __func__, bf->bf_flags));
760 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
761 ("ath_tx_handoff_hw called for mcast queue"));
764 * XXX We should instead just verify that sc_txstart_cnt
765 * or ath_txproc_cnt > 0. That would mean that
766 * the reset is going to be waiting for us to complete.
768 if (sc->sc_txproc_cnt == 0 && sc->sc_txstart_cnt == 0) {
769 device_printf(sc->sc_dev,
770 "%s: TX dispatch without holding txcount/txstart refcnt!\n",
775 * XXX .. this is going to cause the hardware to get upset;
776 * so we really should find some way to drop or queue
783 * XXX TODO: if there's a holdingbf, then
784 * ATH_TXQ_PUTRUNNING should be clear.
786 * If there is a holdingbf and the list is empty,
787 * then axq_link should be pointing to the holdingbf.
789 * Otherwise it should point to the last descriptor
790 * in the last ath_buf.
792 * In any case, we should really ensure that we
793 * update the previous descriptor link pointer to
794 * this descriptor, regardless of all of the above state.
796 * For now this is captured by having axq_link point
797 * to either the holdingbf (if the TXQ list is empty)
798 * or the end of the list (if the TXQ list isn't empty.)
799 * I'd rather just kill axq_link here and do it as above.
803 * Append the frame to the TX queue.
805 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
806 ATH_KTR(sc, ATH_KTR_TX, 3,
807 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
814 * If there's a link pointer, update it.
816 * XXX we should replace this with the above logic, just
817 * to kill axq_link with fire.
819 if (txq->axq_link != NULL) {
820 *txq->axq_link = bf->bf_daddr;
821 DPRINTF(sc, ATH_DEBUG_XMIT,
822 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
823 txq->axq_qnum, txq->axq_link,
824 (caddr_t)bf->bf_daddr, bf->bf_desc,
826 ATH_KTR(sc, ATH_KTR_TX, 5,
827 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
829 txq->axq_qnum, txq->axq_link,
830 (caddr_t)bf->bf_daddr, bf->bf_desc,
835 * If we've not pushed anything into the hardware yet,
836 * push the head of the queue into the TxDP.
838 * Once we've started DMA, there's no guarantee that
839 * updating the TxDP with a new value will actually work.
840 * So we just don't do that - if we hit the end of the list,
841 * we keep that buffer around (the "holding buffer") and
842 * re-start DMA by updating the link pointer of _that_
843 * descriptor and then restart DMA.
845 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
846 bf_first = TAILQ_FIRST(&txq->axq_q);
847 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
848 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
849 DPRINTF(sc, ATH_DEBUG_XMIT,
850 "%s: TXDP[%u] = %p (%p) depth %d\n",
851 __func__, txq->axq_qnum,
852 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
854 ATH_KTR(sc, ATH_KTR_TX, 5,
855 "ath_tx_handoff: TXDP[%u] = %p (%p) "
856 "lastds=%p depth %d",
858 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
864 * Ensure that the bf TXQ matches this TXQ, so later
865 * checking and holding buffer manipulation is sane.
867 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
868 DPRINTF(sc, ATH_DEBUG_XMIT,
869 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
870 __func__, bf, bf->bf_state.bfs_tx_queue,
875 * Track aggregate queue depth.
877 if (bf->bf_state.bfs_aggr)
878 txq->axq_aggr_depth++;
881 * Update the link pointer.
883 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
888 * If we wrote a TxDP above, DMA will start from here.
890 * If DMA is running, it'll do nothing.
892 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
893 * or VEOL) then it stops at the last transmitted write.
894 * We then append a new frame by updating the link pointer
895 * in that descriptor and then kick TxE here; it will re-read
896 * that last descriptor and find the new descriptor to transmit.
898 * This is why we keep the holding descriptor around.
900 ath_hal_txstart(ah, txq->axq_qnum);
902 ATH_KTR(sc, ATH_KTR_TX, 1,
903 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
907 * Restart TX DMA for the given TXQ.
909 * This must be called whether the queue is empty or not.
912 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
914 struct ath_buf *bf, *bf_last;
916 ATH_TXQ_LOCK_ASSERT(txq);
918 /* XXX make this ATH_TXQ_FIRST */
919 bf = TAILQ_FIRST(&txq->axq_q);
920 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
925 DPRINTF(sc, ATH_DEBUG_RESET,
926 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
931 (uint32_t) bf->bf_daddr);
934 if (sc->sc_debug & ATH_DEBUG_RESET)
935 ath_tx_dump(sc, txq);
939 * This is called from a restart, so DMA is known to be
940 * completely stopped.
942 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
943 ("%s: Q%d: called with PUTRUNNING=1\n",
947 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
948 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
950 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
952 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
956 * Hand off a packet to the hardware (or mcast queue.)
958 * The relevant hardware txq should be locked.
961 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
964 ATH_TX_LOCK_ASSERT(sc);
967 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
968 ath_tx_alq_post(sc, bf);
971 if (txq->axq_qnum == ATH_TXQ_SWQ)
972 ath_tx_handoff_mcast(sc, txq, bf);
974 ath_tx_handoff_hw(sc, txq, bf);
978 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
979 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
982 DPRINTF(sc, ATH_DEBUG_XMIT,
983 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
992 const struct ieee80211_cipher *cip;
993 struct ieee80211_key *k;
996 * Construct the 802.11 header+trailer for an encrypted
997 * frame. The only reason this can fail is because of an
998 * unknown or unsupported cipher/key type.
1000 k = ieee80211_crypto_encap(ni, m0);
1003 * This can happen when the key is yanked after the
1004 * frame was queued. Just discard the frame; the
1005 * 802.11 layer counts failures and provides
1006 * debugging/diagnostics.
1011 * Adjust the packet + header lengths for the crypto
1012 * additions and calculate the h/w key index. When
1013 * a s/w mic is done the frame will have had any mic
1014 * added to it prior to entry so m0->m_pkthdr.len will
1015 * account for it. Otherwise we need to add it to the
1019 (*hdrlen) += cip->ic_header;
1020 (*pktlen) += cip->ic_header + cip->ic_trailer;
1021 /* NB: frags always have any TKIP MIC done in s/w */
1022 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1023 (*pktlen) += cip->ic_miclen;
1024 (*keyix) = k->wk_keyix;
1025 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1027 * Use station key cache slot, if assigned.
1029 (*keyix) = ni->ni_ucastkey.wk_keyix;
1030 if ((*keyix) == IEEE80211_KEYIX_NONE)
1031 (*keyix) = HAL_TXKEYIX_INVALID;
1033 (*keyix) = HAL_TXKEYIX_INVALID;
1039 * Calculate whether interoperability protection is required for
1042 * This requires the rate control information be filled in,
1043 * as the protection requirement depends upon the current
1044 * operating mode / PHY.
1047 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1049 struct ieee80211_frame *wh;
1053 const HAL_RATE_TABLE *rt = sc->sc_currates;
1054 struct ieee80211com *ic = &sc->sc_ic;
1056 flags = bf->bf_state.bfs_txflags;
1057 rix = bf->bf_state.bfs_rc[0].rix;
1058 shortPreamble = bf->bf_state.bfs_shpream;
1059 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1062 * If 802.11g protection is enabled, determine whether
1063 * to use RTS/CTS or just CTS. Note that this is only
1064 * done for OFDM unicast frames.
1066 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1067 rt->info[rix].phy == IEEE80211_T_OFDM &&
1068 (flags & HAL_TXDESC_NOACK) == 0) {
1069 bf->bf_state.bfs_doprot = 1;
1070 /* XXX fragments must use CCK rates w/ protection */
1071 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1072 flags |= HAL_TXDESC_RTSENA;
1073 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1074 flags |= HAL_TXDESC_CTSENA;
1077 * For frags it would be desirable to use the
1078 * highest CCK rate for RTS/CTS. But stations
1079 * farther away may detect it at a lower CCK rate
1080 * so use the configured protection rate instead
1083 sc->sc_stats.ast_tx_protect++;
1087 * If 11n protection is enabled and it's a HT frame,
1090 * XXX ic_htprotmode or ic_curhtprotmode?
1091 * XXX should it_htprotmode only matter if ic_curhtprotmode
1092 * XXX indicates it's not a HT pure environment?
1094 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1095 rt->info[rix].phy == IEEE80211_T_HT &&
1096 (flags & HAL_TXDESC_NOACK) == 0) {
1097 flags |= HAL_TXDESC_RTSENA;
1098 sc->sc_stats.ast_tx_htprotect++;
1100 bf->bf_state.bfs_txflags = flags;
1104 * Update the frame duration given the currently selected rate.
1106 * This also updates the frame duration value, so it will require
1110 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1112 struct ieee80211_frame *wh;
1116 struct ath_hal *ah = sc->sc_ah;
1117 const HAL_RATE_TABLE *rt = sc->sc_currates;
1118 int isfrag = bf->bf_m->m_flags & M_FRAG;
1120 flags = bf->bf_state.bfs_txflags;
1121 rix = bf->bf_state.bfs_rc[0].rix;
1122 shortPreamble = bf->bf_state.bfs_shpream;
1123 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1126 * Calculate duration. This logically belongs in the 802.11
1127 * layer but it lacks sufficient information to calculate it.
1129 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1130 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1133 dur = rt->info[rix].spAckDuration;
1135 dur = rt->info[rix].lpAckDuration;
1136 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1137 dur += dur; /* additional SIFS+ACK */
1139 * Include the size of next fragment so NAV is
1140 * updated properly. The last fragment uses only
1143 * XXX TODO: ensure that the rate lookup for each
1144 * fragment is the same as the rate used by the
1147 dur += ath_hal_computetxtime(ah,
1150 rix, shortPreamble);
1154 * Force hardware to use computed duration for next
1155 * fragment by disabling multi-rate retry which updates
1156 * duration based on the multi-rate duration table.
1158 bf->bf_state.bfs_ismrr = 0;
1159 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1160 /* XXX update bfs_rc[0].try? */
1163 /* Update the duration field itself */
1164 *(u_int16_t *)wh->i_dur = htole16(dur);
1169 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1170 int cix, int shortPreamble)
1175 * CTS transmit rate is derived from the transmit rate
1176 * by looking in the h/w rate table. We must also factor
1177 * in whether or not a short preamble is to be used.
1179 /* NB: cix is set above where RTS/CTS is enabled */
1180 KASSERT(cix != 0xff, ("cix not setup"));
1181 ctsrate = rt->info[cix].rateCode;
1183 /* XXX this should only matter for legacy rates */
1185 ctsrate |= rt->info[cix].shortPreamble;
1191 * Calculate the RTS/CTS duration for legacy frames.
1194 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1195 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1198 int ctsduration = 0;
1200 /* This mustn't be called for HT modes */
1201 if (rt->info[cix].phy == IEEE80211_T_HT) {
1202 printf("%s: HT rate where it shouldn't be (0x%x)\n",
1203 __func__, rt->info[cix].rateCode);
1208 * Compute the transmit duration based on the frame
1209 * size and the size of an ACK frame. We call into the
1210 * HAL to do the computation since it depends on the
1211 * characteristics of the actual PHY being used.
1213 * NB: CTS is assumed the same size as an ACK so we can
1214 * use the precalculated ACK durations.
1216 if (shortPreamble) {
1217 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1218 ctsduration += rt->info[cix].spAckDuration;
1219 ctsduration += ath_hal_computetxtime(ah,
1220 rt, pktlen, rix, AH_TRUE);
1221 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1222 ctsduration += rt->info[rix].spAckDuration;
1224 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1225 ctsduration += rt->info[cix].lpAckDuration;
1226 ctsduration += ath_hal_computetxtime(ah,
1227 rt, pktlen, rix, AH_FALSE);
1228 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1229 ctsduration += rt->info[rix].lpAckDuration;
1232 return (ctsduration);
1236 * Update the given ath_buf with updated rts/cts setup and duration
1239 * To support rate lookups for each software retry, the rts/cts rate
1240 * and cts duration must be re-calculated.
1242 * This function assumes the RTS/CTS flags have been set as needed;
1243 * mrr has been disabled; and the rate control lookup has been done.
1245 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1246 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1249 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1251 uint16_t ctsduration = 0;
1252 uint8_t ctsrate = 0;
1253 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1255 const HAL_RATE_TABLE *rt = sc->sc_currates;
1258 * No RTS/CTS enabled? Don't bother.
1260 if ((bf->bf_state.bfs_txflags &
1261 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1262 /* XXX is this really needed? */
1263 bf->bf_state.bfs_ctsrate = 0;
1264 bf->bf_state.bfs_ctsduration = 0;
1269 * If protection is enabled, use the protection rix control
1270 * rate. Otherwise use the rate0 control rate.
1272 if (bf->bf_state.bfs_doprot)
1273 rix = sc->sc_protrix;
1275 rix = bf->bf_state.bfs_rc[0].rix;
1278 * If the raw path has hard-coded ctsrate0 to something,
1281 if (bf->bf_state.bfs_ctsrate0 != 0)
1282 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1284 /* Control rate from above */
1285 cix = rt->info[rix].controlRate;
1287 /* Calculate the rtscts rate for the given cix */
1288 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1289 bf->bf_state.bfs_shpream);
1291 /* The 11n chipsets do ctsduration calculations for you */
1292 if (! ath_tx_is_11n(sc))
1293 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1294 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1295 rt, bf->bf_state.bfs_txflags);
1297 /* Squirrel away in ath_buf */
1298 bf->bf_state.bfs_ctsrate = ctsrate;
1299 bf->bf_state.bfs_ctsduration = ctsduration;
1302 * Must disable multi-rate retry when using RTS/CTS.
1304 if (!sc->sc_mrrprot) {
1305 bf->bf_state.bfs_ismrr = 0;
1306 bf->bf_state.bfs_try0 =
1307 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1312 * Setup the descriptor chain for a normal or fast-frame
1315 * XXX TODO: extend to include the destination hardware QCU ID.
1316 * Make sure that is correct. Make sure that when being added
1317 * to the mcastq, the CABQ QCUID is set or things will get a bit
1321 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1323 struct ath_desc *ds = bf->bf_desc;
1324 struct ath_hal *ah = sc->sc_ah;
1326 if (bf->bf_state.bfs_txrate0 == 0)
1327 DPRINTF(sc, ATH_DEBUG_XMIT,
1328 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1330 ath_hal_setuptxdesc(ah, ds
1331 , bf->bf_state.bfs_pktlen /* packet length */
1332 , bf->bf_state.bfs_hdrlen /* header length */
1333 , bf->bf_state.bfs_atype /* Atheros packet type */
1334 , bf->bf_state.bfs_txpower /* txpower */
1335 , bf->bf_state.bfs_txrate0
1336 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1337 , bf->bf_state.bfs_keyix /* key cache index */
1338 , bf->bf_state.bfs_txantenna /* antenna mode */
1339 , bf->bf_state.bfs_txflags /* flags */
1340 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1341 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1345 * This will be overriden when the descriptor chain is written.
1350 /* Set rate control and descriptor chain for this frame */
1351 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1352 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1358 * This performs a rate lookup for the given ath_buf only if it's required.
1359 * Non-data frames and raw frames don't require it.
1361 * This populates the primary and MRR entries; MRR values are
1362 * then disabled later on if something requires it (eg RTS/CTS on
1365 * This needs to be done before the RTS/CTS fields are calculated
1366 * as they may depend upon the rate chosen.
1369 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1374 if (! bf->bf_state.bfs_doratelookup)
1377 /* Get rid of any previous state */
1378 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1380 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1381 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1382 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1384 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1385 bf->bf_state.bfs_rc[0].rix = rix;
1386 bf->bf_state.bfs_rc[0].ratecode = rate;
1387 bf->bf_state.bfs_rc[0].tries = try0;
1389 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1390 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1391 bf->bf_state.bfs_rc);
1392 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1394 sc->sc_txrix = rix; /* for LED blinking */
1395 sc->sc_lastdatarix = rix; /* for fast frames */
1396 bf->bf_state.bfs_try0 = try0;
1397 bf->bf_state.bfs_txrate0 = rate;
1401 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1404 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1407 struct ath_node *an = ATH_NODE(bf->bf_node);
1409 ATH_TX_LOCK_ASSERT(sc);
1411 if (an->clrdmask == 1) {
1412 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1418 * Return whether this frame should be software queued or
1419 * direct dispatched.
1421 * When doing powersave, BAR frames should be queued but other management
1422 * frames should be directly sent.
1424 * When not doing powersave, stick BAR frames into the hardware queue
1425 * so it goes out even though the queue is paused.
1427 * For now, management frames are also software queued by default.
1430 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1431 struct mbuf *m0, int *queue_to_head)
1433 struct ieee80211_node *ni = &an->an_node;
1434 struct ieee80211_frame *wh;
1435 uint8_t type, subtype;
1437 wh = mtod(m0, struct ieee80211_frame *);
1438 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1439 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1441 (*queue_to_head) = 0;
1443 /* If it's not in powersave - direct-dispatch BAR */
1444 if ((ATH_NODE(ni)->an_is_powersave == 0)
1445 && type == IEEE80211_FC0_TYPE_CTL &&
1446 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1447 DPRINTF(sc, ATH_DEBUG_SW_TX,
1448 "%s: BAR: TX'ing direct\n", __func__);
1450 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1451 && type == IEEE80211_FC0_TYPE_CTL &&
1452 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1453 /* BAR TX whilst asleep; queue */
1454 DPRINTF(sc, ATH_DEBUG_SW_TX,
1455 "%s: swq: TX'ing\n", __func__);
1456 (*queue_to_head) = 1;
1458 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1459 && (type == IEEE80211_FC0_TYPE_MGT ||
1460 type == IEEE80211_FC0_TYPE_CTL)) {
1462 * Other control/mgmt frame; bypass software queuing
1465 DPRINTF(sc, ATH_DEBUG_XMIT,
1466 "%s: %6D: Node is asleep; sending mgmt "
1467 "(type=%d, subtype=%d)\n",
1468 __func__, ni->ni_macaddr, ":", type, subtype);
1477 * Transmit the given frame to the hardware.
1479 * The frame must already be setup; rate control must already have
1482 * XXX since the TXQ lock is being held here (and I dislike holding
1483 * it for this long when not doing software aggregation), later on
1484 * break this function into "setup_normal" and "xmit_normal". The
1485 * lock only needs to be held for the ath_tx_handoff call.
1487 * XXX we don't update the leak count here - if we're doing
1488 * direct frame dispatch, we need to be able to do it without
1489 * decrementing the leak count (eg multicast queue frames.)
1492 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1495 struct ath_node *an = ATH_NODE(bf->bf_node);
1496 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1498 ATH_TX_LOCK_ASSERT(sc);
1501 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1502 * set a completion handler however it doesn't (yet) properly
1503 * handle the strict ordering requirements needed for normal,
1504 * non-aggregate session frames.
1506 * Once this is implemented, only set CLRDMASK like this for
1507 * frames that must go out - eg management/raw frames.
1509 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1511 /* Setup the descriptor before handoff */
1512 ath_tx_do_ratelookup(sc, bf);
1513 ath_tx_calc_duration(sc, bf);
1514 ath_tx_calc_protection(sc, bf);
1515 ath_tx_set_rtscts(sc, bf);
1516 ath_tx_rate_fill_rcflags(sc, bf);
1517 ath_tx_setds(sc, bf);
1519 /* Track per-TID hardware queue depth correctly */
1522 /* Assign the completion handler */
1523 bf->bf_comp = ath_tx_normal_comp;
1525 /* Hand off to hardware */
1526 ath_tx_handoff(sc, txq, bf);
1530 * Do the basic frame setup stuff that's required before the frame
1531 * is added to a software queue.
1533 * All frames get mostly the same treatment and it's done once.
1534 * Retransmits fiddle with things like the rate control setup,
1535 * setting the retransmit bit in the packet; doing relevant DMA/bus
1536 * syncing and relinking it (back) into the hardware TX queue.
1538 * Note that this may cause the mbuf to be reallocated, so
1539 * m0 may not be valid.
1542 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1543 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1545 struct ieee80211vap *vap = ni->ni_vap;
1546 struct ath_hal *ah = sc->sc_ah;
1547 struct ieee80211com *ic = &sc->sc_ic;
1548 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
1549 int error, iswep, ismcast, isfrag, ismrr;
1550 int keyix, hdrlen, pktlen, try0 = 0;
1551 u_int8_t rix = 0, txrate = 0;
1552 struct ath_desc *ds;
1553 struct ieee80211_frame *wh;
1554 u_int subtype, flags;
1556 const HAL_RATE_TABLE *rt;
1557 HAL_BOOL shortPreamble;
1558 struct ath_node *an;
1562 * To ensure that both sequence numbers and the CCMP PN handling
1563 * is "correct", make sure that the relevant TID queue is locked.
1564 * Otherwise the CCMP PN and seqno may appear out of order, causing
1565 * re-ordered frames to have out of order CCMP PN's, resulting
1566 * in many, many frame drops.
1568 ATH_TX_LOCK_ASSERT(sc);
1570 wh = mtod(m0, struct ieee80211_frame *);
1571 iswep = wh->i_fc[1] & IEEE80211_FC1_PROTECTED;
1572 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1573 isfrag = m0->m_flags & M_FRAG;
1574 hdrlen = ieee80211_anyhdrsize(wh);
1576 * Packet length must not include any
1577 * pad bytes; deduct them here.
1579 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1581 /* Handle encryption twiddling if needed */
1582 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1588 /* packet header may have moved, reset our local pointer */
1589 wh = mtod(m0, struct ieee80211_frame *);
1591 pktlen += IEEE80211_CRC_LEN;
1594 * Load the DMA map so any coalescing is done. This
1595 * also calculates the number of descriptors we need.
1597 error = ath_tx_dmasetup(sc, bf, m0);
1600 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
1601 bf->bf_node = ni; /* NB: held reference */
1602 m0 = bf->bf_m; /* NB: may have changed */
1603 wh = mtod(m0, struct ieee80211_frame *);
1605 /* setup descriptors */
1607 rt = sc->sc_currates;
1608 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1611 * NB: the 802.11 layer marks whether or not we should
1612 * use short preamble based on the current mode and
1613 * negotiated parameters.
1615 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1616 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1617 shortPreamble = AH_TRUE;
1618 sc->sc_stats.ast_tx_shortpre++;
1620 shortPreamble = AH_FALSE;
1624 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1626 ismrr = 0; /* default no multi-rate retry*/
1627 pri = M_WME_GETAC(m0); /* honor classification */
1628 /* XXX use txparams instead of fixed values */
1630 * Calculate Atheros packet type from IEEE80211 packet header,
1631 * setup for rate calculations, and select h/w transmit queue.
1633 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1634 case IEEE80211_FC0_TYPE_MGT:
1635 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1636 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1637 atype = HAL_PKT_TYPE_BEACON;
1638 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1639 atype = HAL_PKT_TYPE_PROBE_RESP;
1640 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1641 atype = HAL_PKT_TYPE_ATIM;
1643 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1644 rix = an->an_mgmtrix;
1645 txrate = rt->info[rix].rateCode;
1647 txrate |= rt->info[rix].shortPreamble;
1648 try0 = ATH_TXMGTTRY;
1649 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1651 case IEEE80211_FC0_TYPE_CTL:
1652 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1653 rix = an->an_mgmtrix;
1654 txrate = rt->info[rix].rateCode;
1656 txrate |= rt->info[rix].shortPreamble;
1657 try0 = ATH_TXMGTTRY;
1658 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1660 case IEEE80211_FC0_TYPE_DATA:
1661 atype = HAL_PKT_TYPE_NORMAL; /* default */
1663 * Data frames: multicast frames go out at a fixed rate,
1664 * EAPOL frames use the mgmt frame rate; otherwise consult
1665 * the rate control module for the rate to use.
1668 rix = an->an_mcastrix;
1669 txrate = rt->info[rix].rateCode;
1671 txrate |= rt->info[rix].shortPreamble;
1673 } else if (m0->m_flags & M_EAPOL) {
1674 /* XXX? maybe always use long preamble? */
1675 rix = an->an_mgmtrix;
1676 txrate = rt->info[rix].rateCode;
1678 txrate |= rt->info[rix].shortPreamble;
1679 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1682 * Do rate lookup on each TX, rather than using
1683 * the hard-coded TX information decided here.
1686 bf->bf_state.bfs_doratelookup = 1;
1688 if (cap->cap_wmeParams[pri].wmep_noackPolicy)
1689 flags |= HAL_TXDESC_NOACK;
1692 device_printf(sc->sc_dev, "bogus frame type 0x%x (%s)\n",
1693 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1695 /* XXX free tx dmamap */
1701 * There are two known scenarios where the frame AC doesn't match
1702 * what the destination TXQ is.
1704 * + non-QoS frames (eg management?) that the net80211 stack has
1705 * assigned a higher AC to, but since it's a non-QoS TID, it's
1706 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1707 * It's quite possible that management frames should just be
1708 * direct dispatched to hardware rather than go via the software
1709 * queue; that should be investigated in the future. There are
1710 * some specific scenarios where this doesn't make sense, mostly
1711 * surrounding ADDBA request/response - hence why that is special
1714 * + Multicast frames going into the VAP mcast queue. That shows up
1717 * This driver should eventually support separate TID and TXQ locking,
1718 * allowing for arbitrary AC frames to appear on arbitrary software
1719 * queues, being queued to the "correct" hardware queue when needed.
1722 if (txq != sc->sc_ac2q[pri]) {
1723 DPRINTF(sc, ATH_DEBUG_XMIT,
1724 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1730 sc->sc_ac2q[pri]->axq_qnum);
1735 * Calculate miscellaneous flags.
1738 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1739 } else if (pktlen > vap->iv_rtsthreshold &&
1740 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1741 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1742 sc->sc_stats.ast_tx_rts++;
1744 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1745 sc->sc_stats.ast_tx_noack++;
1746 #ifdef IEEE80211_SUPPORT_TDMA
1747 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1748 DPRINTF(sc, ATH_DEBUG_TDMA,
1749 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1750 sc->sc_stats.ast_tdma_ack++;
1751 /* XXX free tx dmamap */
1758 * Determine if a tx interrupt should be generated for
1759 * this descriptor. We take a tx interrupt to reap
1760 * descriptors when the h/w hits an EOL condition or
1761 * when the descriptor is specifically marked to generate
1762 * an interrupt. We periodically mark descriptors in this
1763 * way to insure timely replenishing of the supply needed
1764 * for sending frames. Defering interrupts reduces system
1765 * load and potentially allows more concurrent work to be
1766 * done but if done to aggressively can cause senders to
1769 * NB: use >= to deal with sc_txintrperiod changing
1770 * dynamically through sysctl.
1772 if (flags & HAL_TXDESC_INTREQ) {
1773 txq->axq_intrcnt = 0;
1774 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1775 flags |= HAL_TXDESC_INTREQ;
1776 txq->axq_intrcnt = 0;
1779 /* This point forward is actual TX bits */
1782 * At this point we are committed to sending the frame
1783 * and we don't need to look at m_nextpkt; clear it in
1784 * case this frame is part of frag chain.
1786 m0->m_nextpkt = NULL;
1788 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1789 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1790 sc->sc_hwmap[rix].ieeerate, -1);
1792 if (ieee80211_radiotap_active_vap(vap)) {
1793 u_int64_t tsf = ath_hal_gettsf64(ah);
1795 sc->sc_tx_th.wt_tsf = htole64(tsf);
1796 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1798 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1800 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1801 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1802 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1803 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1805 ieee80211_radiotap_tx(vap, m0);
1808 /* Blank the legacy rate array */
1809 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1812 * ath_buf_set_rate needs at least one rate/try to setup
1813 * the rate scenario.
1815 bf->bf_state.bfs_rc[0].rix = rix;
1816 bf->bf_state.bfs_rc[0].tries = try0;
1817 bf->bf_state.bfs_rc[0].ratecode = txrate;
1819 /* Store the decided rate index values away */
1820 bf->bf_state.bfs_pktlen = pktlen;
1821 bf->bf_state.bfs_hdrlen = hdrlen;
1822 bf->bf_state.bfs_atype = atype;
1823 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1824 bf->bf_state.bfs_txrate0 = txrate;
1825 bf->bf_state.bfs_try0 = try0;
1826 bf->bf_state.bfs_keyix = keyix;
1827 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1828 bf->bf_state.bfs_txflags = flags;
1829 bf->bf_state.bfs_shpream = shortPreamble;
1831 /* XXX this should be done in ath_tx_setrate() */
1832 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1833 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1834 bf->bf_state.bfs_ctsduration = 0;
1835 bf->bf_state.bfs_ismrr = ismrr;
1841 * Queue a frame to the hardware or software queue.
1843 * This can be called by the net80211 code.
1845 * XXX what about locking? Or, push the seqno assign into the
1846 * XXX aggregate scheduler so its serialised?
1848 * XXX When sending management frames via ath_raw_xmit(),
1849 * should CLRDMASK be set unconditionally?
1852 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1853 struct ath_buf *bf, struct mbuf *m0)
1855 struct ieee80211vap *vap = ni->ni_vap;
1856 struct ath_vap *avp = ATH_VAP(vap);
1860 struct ath_txq *txq;
1862 const struct ieee80211_frame *wh;
1863 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1864 ieee80211_seq seqno;
1865 uint8_t type, subtype;
1868 ATH_TX_LOCK_ASSERT(sc);
1871 * Determine the target hardware queue.
1873 * For multicast frames, the txq gets overridden appropriately
1874 * depending upon the state of PS.
1876 * For any other frame, we do a TID/QoS lookup inside the frame
1877 * to see what the TID should be. If it's a non-QoS frame, the
1878 * AC and TID are overridden. The TID/TXQ code assumes the
1879 * TID is on a predictable hardware TXQ, so we don't support
1880 * having a node TID queued to multiple hardware TXQs.
1881 * This may change in the future but would require some locking
1884 pri = ath_tx_getac(sc, m0);
1885 tid = ath_tx_gettid(sc, m0);
1887 txq = sc->sc_ac2q[pri];
1888 wh = mtod(m0, struct ieee80211_frame *);
1889 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1890 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1891 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1894 * Enforce how deep the multicast queue can grow.
1896 * XXX duplicated in ath_raw_xmit().
1898 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1899 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1900 > sc->sc_txq_mcastq_maxdepth) {
1901 sc->sc_stats.ast_tx_mcastq_overflow++;
1908 * Enforce how deep the unicast queue can grow.
1910 * If the node is in power save then we don't want
1911 * the software queue to grow too deep, or a node may
1912 * end up consuming all of the ath_buf entries.
1914 * For now, only do this for DATA frames.
1916 * We will want to cap how many management/control
1917 * frames get punted to the software queue so it doesn't
1918 * fill up. But the correct solution isn't yet obvious.
1919 * In any case, this check should at least let frames pass
1920 * that we are direct-dispatching.
1922 * XXX TODO: duplicate this to the raw xmit path!
1924 if (type == IEEE80211_FC0_TYPE_DATA &&
1925 ATH_NODE(ni)->an_is_powersave &&
1926 ATH_NODE(ni)->an_swq_depth >
1927 sc->sc_txq_node_psq_maxdepth) {
1928 sc->sc_stats.ast_tx_node_psq_overflow++;
1934 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1935 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1936 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1938 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1939 __func__, tid, pri, is_ampdu);
1941 /* Set local packet state, used to queue packets to hardware */
1942 bf->bf_state.bfs_tid = tid;
1943 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
1944 bf->bf_state.bfs_pri = pri;
1948 * When servicing one or more stations in power-save mode
1949 * (or) if there is some mcast data waiting on the mcast
1950 * queue (to prevent out of order delivery) multicast frames
1951 * must be bufferd until after the beacon.
1953 * TODO: we should lock the mcastq before we check the length.
1955 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
1956 txq = &avp->av_mcastq;
1958 * Mark the frame as eventually belonging on the CAB
1959 * queue, so the descriptor setup functions will
1960 * correctly initialise the descriptor 'qcuId' field.
1962 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
1966 /* Do the generic frame setup */
1967 /* XXX should just bzero the bf_state? */
1968 bf->bf_state.bfs_dobaw = 0;
1970 /* A-MPDU TX? Manually set sequence number */
1972 * Don't do it whilst pending; the net80211 layer still
1977 * Always call; this function will
1978 * handle making sure that null data frames
1979 * don't get a sequence number from the current
1980 * TID and thus mess with the BAW.
1982 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
1985 * Don't add QoS NULL frames to the BAW.
1987 if (IEEE80211_QOS_HAS_SEQ(wh) &&
1988 subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL) {
1989 bf->bf_state.bfs_dobaw = 1;
1994 * If needed, the sequence number has been assigned.
1995 * Squirrel it away somewhere easy to get to.
1997 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
1999 /* Is ampdu pending? fetch the seqno and print it out */
2000 if (is_ampdu_pending)
2001 DPRINTF(sc, ATH_DEBUG_SW_TX,
2002 "%s: tid %d: ampdu pending, seqno %d\n",
2003 __func__, tid, M_SEQNO_GET(m0));
2005 /* This also sets up the DMA map */
2006 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
2011 /* At this point m0 could have changed! */
2016 * If it's a multicast frame, do a direct-dispatch to the
2017 * destination hardware queue. Don't bother software
2021 * If it's a BAR frame, do a direct dispatch to the
2022 * destination hardware queue. Don't bother software
2023 * queuing it, as the TID will now be paused.
2024 * Sending a BAR frame can occur from the net80211 txa timer
2025 * (ie, retries) or from the ath txtask (completion call.)
2026 * It queues directly to hardware because the TID is paused
2027 * at this point (and won't be unpaused until the BAR has
2028 * either been TXed successfully or max retries has been
2032 * Until things are better debugged - if this node is asleep
2033 * and we're sending it a non-BAR frame, direct dispatch it.
2034 * Why? Because we need to figure out what's actually being
2035 * sent - eg, during reassociation/reauthentication after
2036 * the node (last) disappeared whilst asleep, the driver should
2037 * have unpaused/unsleep'ed the node. So until that is
2038 * sorted out, use this workaround.
2040 if (txq == &avp->av_mcastq) {
2041 DPRINTF(sc, ATH_DEBUG_SW_TX,
2042 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2043 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2044 ath_tx_xmit_normal(sc, txq, bf);
2045 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2047 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2049 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2050 ath_tx_xmit_normal(sc, txq, bf);
2054 * For now, since there's no software queue,
2055 * direct-dispatch to the hardware.
2057 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2059 * Update the current leak count if
2060 * we're leaking frames; and set the
2061 * MORE flag as appropriate.
2063 ath_tx_leak_count_update(sc, tid, bf);
2064 ath_tx_xmit_normal(sc, txq, bf);
2071 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2072 struct ath_buf *bf, struct mbuf *m0,
2073 const struct ieee80211_bpf_params *params)
2075 struct ieee80211com *ic = &sc->sc_ic;
2076 struct ath_hal *ah = sc->sc_ah;
2077 struct ieee80211vap *vap = ni->ni_vap;
2078 int error, ismcast, ismrr;
2079 int keyix, hdrlen, pktlen, try0, txantenna;
2080 u_int8_t rix, txrate;
2081 struct ieee80211_frame *wh;
2084 const HAL_RATE_TABLE *rt;
2085 struct ath_desc *ds;
2089 uint8_t type, subtype;
2091 struct ath_node *an = ATH_NODE(ni);
2093 ATH_TX_LOCK_ASSERT(sc);
2095 wh = mtod(m0, struct ieee80211_frame *);
2096 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2097 hdrlen = ieee80211_anyhdrsize(wh);
2099 * Packet length must not include any
2100 * pad bytes; deduct them here.
2102 /* XXX honor IEEE80211_BPF_DATAPAD */
2103 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2105 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2106 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2108 ATH_KTR(sc, ATH_KTR_TX, 2,
2109 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2111 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2114 pri = params->ibp_pri & 3;
2115 /* Override pri if the frame isn't a QoS one */
2116 if (! IEEE80211_QOS_HAS_SEQ(wh))
2117 pri = ath_tx_getac(sc, m0);
2119 /* XXX If it's an ADDBA, override the correct queue */
2120 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2122 /* Map ADDBA to the correct priority */
2125 DPRINTF(sc, ATH_DEBUG_XMIT,
2126 "%s: overriding tid %d pri %d -> %d\n",
2127 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2129 pri = TID_TO_WME_AC(o_tid);
2132 /* Handle encryption twiddling if needed */
2133 if (! ath_tx_tag_crypto(sc, ni,
2134 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2135 &hdrlen, &pktlen, &keyix)) {
2139 /* packet header may have moved, reset our local pointer */
2140 wh = mtod(m0, struct ieee80211_frame *);
2142 /* Do the generic frame setup */
2143 /* XXX should just bzero the bf_state? */
2144 bf->bf_state.bfs_dobaw = 0;
2146 error = ath_tx_dmasetup(sc, bf, m0);
2149 m0 = bf->bf_m; /* NB: may have changed */
2150 wh = mtod(m0, struct ieee80211_frame *);
2151 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
2152 bf->bf_node = ni; /* NB: held reference */
2154 /* Always enable CLRDMASK for raw frames for now.. */
2155 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2156 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2157 if (params->ibp_flags & IEEE80211_BPF_RTS)
2158 flags |= HAL_TXDESC_RTSENA;
2159 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2160 /* XXX assume 11g/11n protection? */
2161 bf->bf_state.bfs_doprot = 1;
2162 flags |= HAL_TXDESC_CTSENA;
2164 /* XXX leave ismcast to injector? */
2165 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2166 flags |= HAL_TXDESC_NOACK;
2168 rt = sc->sc_currates;
2169 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2171 /* Fetch first rate information */
2172 rix = ath_tx_findrix(sc, params->ibp_rate0);
2173 try0 = params->ibp_try0;
2176 * Override EAPOL rate as appropriate.
2178 if (m0->m_flags & M_EAPOL) {
2179 /* XXX? maybe always use long preamble? */
2180 rix = an->an_mgmtrix;
2181 try0 = ATH_TXMAXTRY; /* XXX?too many? */
2184 txrate = rt->info[rix].rateCode;
2185 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2186 txrate |= rt->info[rix].shortPreamble;
2188 ismrr = (params->ibp_try1 != 0);
2189 txantenna = params->ibp_pri >> 2;
2190 if (txantenna == 0) /* XXX? */
2191 txantenna = sc->sc_txantenna;
2194 * Since ctsrate is fixed, store it away for later
2195 * use when the descriptor fields are being set.
2197 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2198 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2201 * NB: we mark all packets as type PSPOLL so the h/w won't
2202 * set the sequence number, duration, etc.
2204 atype = HAL_PKT_TYPE_PSPOLL;
2206 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2207 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2208 sc->sc_hwmap[rix].ieeerate, -1);
2210 if (ieee80211_radiotap_active_vap(vap)) {
2211 u_int64_t tsf = ath_hal_gettsf64(ah);
2213 sc->sc_tx_th.wt_tsf = htole64(tsf);
2214 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2215 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)
2216 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2217 if (m0->m_flags & M_FRAG)
2218 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2219 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2220 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2221 ieee80211_get_node_txpower(ni));
2222 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2224 ieee80211_radiotap_tx(vap, m0);
2228 * Formulate first tx descriptor with tx controls.
2231 /* XXX check return value? */
2233 /* Store the decided rate index values away */
2234 bf->bf_state.bfs_pktlen = pktlen;
2235 bf->bf_state.bfs_hdrlen = hdrlen;
2236 bf->bf_state.bfs_atype = atype;
2237 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2238 ieee80211_get_node_txpower(ni));
2239 bf->bf_state.bfs_txrate0 = txrate;
2240 bf->bf_state.bfs_try0 = try0;
2241 bf->bf_state.bfs_keyix = keyix;
2242 bf->bf_state.bfs_txantenna = txantenna;
2243 bf->bf_state.bfs_txflags = flags;
2244 bf->bf_state.bfs_shpream =
2245 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2247 /* Set local packet state, used to queue packets to hardware */
2248 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2249 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2250 bf->bf_state.bfs_pri = pri;
2252 /* XXX this should be done in ath_tx_setrate() */
2253 bf->bf_state.bfs_ctsrate = 0;
2254 bf->bf_state.bfs_ctsduration = 0;
2255 bf->bf_state.bfs_ismrr = ismrr;
2257 /* Blank the legacy rate array */
2258 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2260 bf->bf_state.bfs_rc[0].rix = rix;
2261 bf->bf_state.bfs_rc[0].tries = try0;
2262 bf->bf_state.bfs_rc[0].ratecode = txrate;
2267 rix = ath_tx_findrix(sc, params->ibp_rate1);
2268 bf->bf_state.bfs_rc[1].rix = rix;
2269 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2271 rix = ath_tx_findrix(sc, params->ibp_rate2);
2272 bf->bf_state.bfs_rc[2].rix = rix;
2273 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2275 rix = ath_tx_findrix(sc, params->ibp_rate3);
2276 bf->bf_state.bfs_rc[3].rix = rix;
2277 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2280 * All the required rate control decisions have been made;
2281 * fill in the rc flags.
2283 ath_tx_rate_fill_rcflags(sc, bf);
2285 /* NB: no buffered multicast in power save support */
2288 * If we're overiding the ADDBA destination, dump directly
2289 * into the hardware queue, right after any pending
2290 * frames to that node are.
2292 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2293 __func__, do_override);
2297 * Put addba frames in the right place in the right TID/HWQ.
2300 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2302 * XXX if it's addba frames, should we be leaking
2303 * them out via the frame leak method?
2304 * XXX for now let's not risk it; but we may wish
2305 * to investigate this later.
2307 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2308 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2310 /* Queue to software queue */
2311 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2313 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2314 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2317 /* Direct-dispatch to the hardware */
2318 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2320 * Update the current leak count if
2321 * we're leaking frames; and set the
2322 * MORE flag as appropriate.
2324 ath_tx_leak_count_update(sc, tid, bf);
2325 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2333 * This can be called by net80211.
2336 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2337 const struct ieee80211_bpf_params *params)
2339 struct ieee80211com *ic = ni->ni_ic;
2340 struct ath_softc *sc = ic->ic_softc;
2342 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2346 if (sc->sc_inreset_cnt > 0) {
2347 DPRINTF(sc, ATH_DEBUG_XMIT,
2348 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2353 sc->sc_txstart_cnt++;
2356 /* Wake the hardware up already */
2358 ath_power_set_power_state(sc, HAL_PM_AWAKE);
2363 if (!sc->sc_running || sc->sc_invalid) {
2364 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, r/i: %d/%d",
2365 __func__, sc->sc_running, sc->sc_invalid);
2372 * Enforce how deep the multicast queue can grow.
2374 * XXX duplicated in ath_tx_start().
2376 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2377 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2378 > sc->sc_txq_mcastq_maxdepth) {
2379 sc->sc_stats.ast_tx_mcastq_overflow++;
2390 * Grab a TX buffer and associated resources.
2392 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2394 sc->sc_stats.ast_tx_nobuf++;
2399 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2402 if (params == NULL) {
2404 * Legacy path; interpret frame contents to decide
2405 * precisely how to send the frame.
2407 if (ath_tx_start(sc, ni, bf, m)) {
2408 error = EIO; /* XXX */
2413 * Caller supplied explicit parameters to use in
2414 * sending the frame.
2416 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2417 error = EIO; /* XXX */
2421 sc->sc_wd_timer = 5;
2422 sc->sc_stats.ast_tx_raw++;
2425 * Update the TIM - if there's anything queued to the
2426 * software queue and power save is enabled, we should
2429 ath_tx_update_tim(sc, ni, 1);
2434 sc->sc_txstart_cnt--;
2438 /* Put the hardware back to sleep if required */
2440 ath_power_restore_power_state(sc);
2446 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2452 ath_returnbuf_head(sc, bf);
2453 ATH_TXBUF_UNLOCK(sc);
2459 sc->sc_txstart_cnt--;
2462 /* Put the hardware back to sleep if required */
2464 ath_power_restore_power_state(sc);
2468 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2470 sc->sc_stats.ast_tx_raw_fail++;
2471 ieee80211_free_node(ni);
2476 /* Some helper functions */
2479 * ADDBA (and potentially others) need to be placed in the same
2480 * hardware queue as the TID/node it's relating to. This is so
2481 * it goes out after any pending non-aggregate frames to the
2484 * If this isn't done, the ADDBA can go out before the frames
2485 * queued in hardware. Even though these frames have a sequence
2486 * number -earlier- than the ADDBA can be transmitted (but
2487 * no frames whose sequence numbers are after the ADDBA should
2488 * be!) they'll arrive after the ADDBA - and the receiving end
2489 * will simply drop them as being out of the BAW.
2491 * The frames can't be appended to the TID software queue - it'll
2492 * never be sent out. So these frames have to be directly
2493 * dispatched to the hardware, rather than queued in software.
2494 * So if this function returns true, the TXQ has to be
2495 * overridden and it has to be directly dispatched.
2497 * It's a dirty hack, but someone's gotta do it.
2501 * XXX doesn't belong here!
2504 ieee80211_is_action(struct ieee80211_frame *wh)
2506 /* Type: Management frame? */
2507 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2508 IEEE80211_FC0_TYPE_MGT)
2511 /* Subtype: Action frame? */
2512 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2513 IEEE80211_FC0_SUBTYPE_ACTION)
2519 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2521 * Return an alternate TID for ADDBA request frames.
2523 * Yes, this likely should be done in the net80211 layer.
2526 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2527 struct ieee80211_node *ni,
2528 struct mbuf *m0, int *tid)
2530 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2531 struct ieee80211_action_ba_addbarequest *ia;
2533 uint16_t baparamset;
2535 /* Not action frame? Bail */
2536 if (! ieee80211_is_action(wh))
2539 /* XXX Not needed for frames we send? */
2541 /* Correct length? */
2542 if (! ieee80211_parse_action(ni, m))
2546 /* Extract out action frame */
2547 frm = (u_int8_t *)&wh[1];
2548 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2550 /* Not ADDBA? Bail */
2551 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2553 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2556 /* Extract TID, return it */
2557 baparamset = le16toh(ia->rq_baparamset);
2558 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2564 /* Per-node software queue operations */
2567 * Add the current packet to the given BAW.
2568 * It is assumed that the current packet
2570 * + fits inside the BAW;
2571 * + already has had a sequence number allocated.
2573 * Since the BAW status may be modified by both the ath task and
2574 * the net80211/ifnet contexts, the TID must be locked.
2577 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2578 struct ath_tid *tid, struct ath_buf *bf)
2581 struct ieee80211_tx_ampdu *tap;
2583 ATH_TX_LOCK_ASSERT(sc);
2585 if (bf->bf_state.bfs_isretried)
2588 tap = ath_tx_get_tx_tid(an, tid->tid);
2590 if (! bf->bf_state.bfs_dobaw) {
2591 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2592 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2593 __func__, SEQNO(bf->bf_state.bfs_seqno),
2594 tap->txa_start, tap->txa_wnd);
2597 if (bf->bf_state.bfs_addedbaw)
2598 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2599 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2600 "baw head=%d tail=%d\n",
2601 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2602 tap->txa_start, tap->txa_wnd, tid->baw_head,
2606 * Verify that the given sequence number is not outside of the
2607 * BAW. Complain loudly if that's the case.
2609 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2610 SEQNO(bf->bf_state.bfs_seqno))) {
2611 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2612 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2613 "baw head=%d tail=%d\n",
2614 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2615 tap->txa_start, tap->txa_wnd, tid->baw_head,
2620 * ni->ni_txseqs[] is the currently allocated seqno.
2621 * the txa state contains the current baw start.
2623 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2624 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2625 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2626 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2627 "baw head=%d tail=%d\n",
2628 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2629 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2634 assert(tid->tx_buf[cindex] == NULL);
2636 if (tid->tx_buf[cindex] != NULL) {
2637 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2638 "%s: ba packet dup (index=%d, cindex=%d, "
2639 "head=%d, tail=%d)\n",
2640 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2641 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2642 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2644 tid->tx_buf[cindex],
2645 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2647 SEQNO(bf->bf_state.bfs_seqno)
2650 tid->tx_buf[cindex] = bf;
2652 if (index >= ((tid->baw_tail - tid->baw_head) &
2653 (ATH_TID_MAX_BUFS - 1))) {
2654 tid->baw_tail = cindex;
2655 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2660 * Flip the BAW buffer entry over from the existing one to the new one.
2662 * When software retransmitting a (sub-)frame, it is entirely possible that
2663 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2664 * In that instance the buffer is cloned and the new buffer is used for
2665 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2666 * tracking array to maintain consistency.
2669 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2670 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2673 struct ieee80211_tx_ampdu *tap;
2674 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2676 ATH_TX_LOCK_ASSERT(sc);
2678 tap = ath_tx_get_tx_tid(an, tid->tid);
2679 index = ATH_BA_INDEX(tap->txa_start, seqno);
2680 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2683 * Just warn for now; if it happens then we should find out
2684 * about it. It's highly likely the aggregation session will
2687 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2688 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2689 "%s: retransmitted buffer"
2690 " has mismatching seqno's, BA session may hang.\n",
2692 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2693 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2694 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2697 if (tid->tx_buf[cindex] != old_bf) {
2698 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2699 "%s: ath_buf pointer incorrect; "
2700 " has m BA session may hang.\n", __func__);
2701 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2702 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2705 tid->tx_buf[cindex] = new_bf;
2709 * seq_start - left edge of BAW
2710 * seq_next - current/next sequence number to allocate
2712 * Since the BAW status may be modified by both the ath task and
2713 * the net80211/ifnet contexts, the TID must be locked.
2716 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2717 struct ath_tid *tid, const struct ath_buf *bf)
2720 struct ieee80211_tx_ampdu *tap;
2721 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2723 ATH_TX_LOCK_ASSERT(sc);
2725 tap = ath_tx_get_tx_tid(an, tid->tid);
2726 index = ATH_BA_INDEX(tap->txa_start, seqno);
2727 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2729 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2730 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2731 "baw head=%d, tail=%d\n",
2732 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2733 cindex, tid->baw_head, tid->baw_tail);
2736 * If this occurs then we have a big problem - something else
2737 * has slid tap->txa_start along without updating the BAW
2738 * tracking start/end pointers. Thus the TX BAW state is now
2739 * completely busted.
2741 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2742 * it's quite possible that a cloned buffer is making its way
2743 * here and causing it to fire off. Disable TDMA for now.
2745 if (tid->tx_buf[cindex] != bf) {
2746 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2747 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2748 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2749 tid->tx_buf[cindex],
2750 (tid->tx_buf[cindex] != NULL) ?
2751 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2754 tid->tx_buf[cindex] = NULL;
2756 while (tid->baw_head != tid->baw_tail &&
2757 !tid->tx_buf[tid->baw_head]) {
2758 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2759 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2761 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2762 "%s: tid=%d: baw is now %d:%d, baw head=%d\n",
2763 __func__, tid->tid, tap->txa_start, tap->txa_wnd, tid->baw_head);
2767 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2770 struct ieee80211_frame *wh;
2772 ATH_TX_LOCK_ASSERT(sc);
2774 if (tid->an->an_leak_count > 0) {
2775 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2778 * Update MORE based on the software/net80211 queue states.
2780 if ((tid->an->an_stack_psq > 0)
2781 || (tid->an->an_swq_depth > 0))
2782 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2784 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2786 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2787 "%s: %6D: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2789 tid->an->an_node.ni_macaddr,
2791 tid->an->an_leak_count,
2792 tid->an->an_stack_psq,
2793 tid->an->an_swq_depth,
2794 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2797 * Re-sync the underlying buffer.
2799 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2800 BUS_DMASYNC_PREWRITE);
2802 tid->an->an_leak_count --;
2807 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2810 ATH_TX_LOCK_ASSERT(sc);
2812 if (tid->an->an_leak_count > 0) {
2821 * Mark the current node/TID as ready to TX.
2823 * This is done to make it easy for the software scheduler to
2824 * find which nodes have data to send.
2826 * The TXQ lock must be held.
2829 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2831 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2833 ATH_TX_LOCK_ASSERT(sc);
2836 * If we are leaking out a frame to this destination
2837 * for PS-POLL, ensure that we allow scheduling to
2840 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2841 return; /* paused, can't schedule yet */
2844 return; /* already scheduled */
2850 * If this is a sleeping node we're leaking to, given
2851 * it a higher priority. This is so bad for QoS it hurts.
2853 if (tid->an->an_leak_count) {
2854 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2856 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2861 * We can't do the above - it'll confuse the TXQ software
2862 * scheduler which will keep checking the _head_ TID
2863 * in the list to see if it has traffic. If we queue
2864 * a TID to the head of the list and it doesn't transmit,
2865 * we'll check it again.
2867 * So, get the rest of this leaking frames support working
2868 * and reliable first and _then_ optimise it so they're
2869 * pushed out in front of any other pending software
2872 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2876 * Mark the current node as no longer needing to be polled for
2879 * The TXQ lock must be held.
2882 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2884 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2886 ATH_TX_LOCK_ASSERT(sc);
2888 if (tid->sched == 0)
2892 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2896 * Assign a sequence number manually to the given frame.
2898 * This should only be called for A-MPDU TX frames.
2900 static ieee80211_seq
2901 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2902 struct ath_buf *bf, struct mbuf *m0)
2904 struct ieee80211_frame *wh;
2906 ieee80211_seq seqno;
2910 wh = mtod(m0, struct ieee80211_frame *);
2911 pri = M_WME_GETAC(m0); /* honor classification */
2912 tid = WME_AC_TO_TID(pri);
2913 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pri=%d, tid=%d, qos has seq=%d\n",
2914 __func__, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
2916 /* XXX Is it a control frame? Ignore */
2918 /* Does the packet require a sequence number? */
2919 if (! IEEE80211_QOS_HAS_SEQ(wh))
2922 ATH_TX_LOCK_ASSERT(sc);
2925 * Is it a QOS NULL Data frame? Give it a sequence number from
2926 * the default TID (IEEE80211_NONQOS_TID.)
2928 * The RX path of everything I've looked at doesn't include the NULL
2929 * data frame sequence number in the aggregation state updates, so
2930 * assigning it a sequence number there will cause a BAW hole on the
2933 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2934 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
2935 /* XXX no locking for this TID? This is a bit of a problem. */
2936 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
2937 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
2939 /* Manually assign sequence number */
2940 seqno = ni->ni_txseqs[tid];
2941 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
2943 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
2944 M_SEQNO_SET(m0, seqno);
2946 /* Return so caller can do something with it if needed */
2947 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: -> seqno=%d\n", __func__, seqno);
2952 * Attempt to direct dispatch an aggregate frame to hardware.
2953 * If the frame is out of BAW, queue.
2954 * Otherwise, schedule it as a single frame.
2957 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
2958 struct ath_txq *txq, struct ath_buf *bf)
2960 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
2961 struct ieee80211_tx_ampdu *tap;
2963 ATH_TX_LOCK_ASSERT(sc);
2965 tap = ath_tx_get_tx_tid(an, tid->tid);
2968 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
2969 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2970 /* XXX don't sched - we're paused! */
2974 /* outside baw? queue */
2975 if (bf->bf_state.bfs_dobaw &&
2976 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2977 SEQNO(bf->bf_state.bfs_seqno)))) {
2978 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2979 ath_tx_tid_sched(sc, tid);
2984 * This is a temporary check and should be removed once
2985 * all the relevant code paths have been fixed.
2987 * During aggregate retries, it's possible that the head
2988 * frame will fail (which has the bfs_aggr and bfs_nframes
2989 * fields set for said aggregate) and will be retried as
2990 * a single frame. In this instance, the values should
2991 * be reset or the completion code will get upset with you.
2993 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
2994 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
2995 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
2996 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
2997 bf->bf_state.bfs_aggr = 0;
2998 bf->bf_state.bfs_nframes = 1;
3001 /* Update CLRDMASK just before this frame is queued */
3002 ath_tx_update_clrdmask(sc, tid, bf);
3004 /* Direct dispatch to hardware */
3005 ath_tx_do_ratelookup(sc, bf);
3006 ath_tx_calc_duration(sc, bf);
3007 ath_tx_calc_protection(sc, bf);
3008 ath_tx_set_rtscts(sc, bf);
3009 ath_tx_rate_fill_rcflags(sc, bf);
3010 ath_tx_setds(sc, bf);
3013 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
3015 /* Track per-TID hardware queue depth correctly */
3019 if (bf->bf_state.bfs_dobaw) {
3020 ath_tx_addto_baw(sc, an, tid, bf);
3021 bf->bf_state.bfs_addedbaw = 1;
3024 /* Set completion handler, multi-frame aggregate or not */
3025 bf->bf_comp = ath_tx_aggr_comp;
3028 * Update the current leak count if
3029 * we're leaking frames; and set the
3030 * MORE flag as appropriate.
3032 ath_tx_leak_count_update(sc, tid, bf);
3034 /* Hand off to hardware */
3035 ath_tx_handoff(sc, txq, bf);
3039 * Attempt to send the packet.
3040 * If the queue isn't busy, direct-dispatch.
3041 * If the queue is busy enough, queue the given packet on the
3042 * relevant software queue.
3045 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3046 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3048 struct ath_node *an = ATH_NODE(ni);
3049 struct ieee80211_frame *wh;
3050 struct ath_tid *atid;
3052 struct mbuf *m0 = bf->bf_m;
3054 ATH_TX_LOCK_ASSERT(sc);
3056 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3057 wh = mtod(m0, struct ieee80211_frame *);
3058 pri = ath_tx_getac(sc, m0);
3059 tid = ath_tx_gettid(sc, m0);
3060 atid = &an->an_tid[tid];
3062 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3063 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3065 /* Set local packet state, used to queue packets to hardware */
3066 /* XXX potentially duplicate info, re-check */
3067 bf->bf_state.bfs_tid = tid;
3068 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3069 bf->bf_state.bfs_pri = pri;
3072 * If the hardware queue isn't busy, queue it directly.
3073 * If the hardware queue is busy, queue it.
3074 * If the TID is paused or the traffic it outside BAW, software
3077 * If the node is in power-save and we're leaking a frame,
3078 * leak a single frame.
3080 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3081 /* TID is paused, queue */
3082 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3084 * If the caller requested that it be sent at a high
3085 * priority, queue it at the head of the list.
3088 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3090 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3091 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3092 /* AMPDU pending; queue */
3093 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3094 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3096 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3097 /* AMPDU running, attempt direct dispatch if possible */
3100 * Always queue the frame to the tail of the list.
3102 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3105 * If the hardware queue isn't busy, direct dispatch
3106 * the head frame in the list. Don't schedule the
3107 * TID - let it build some more frames first?
3109 * When running A-MPDU, always just check the hardware
3110 * queue depth against the aggregate frame limit.
3111 * We don't want to burst a large number of single frames
3112 * out to the hardware; we want to aggressively hold back.
3114 * Otherwise, schedule the TID.
3116 /* XXX TXQ locking */
3117 if (txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_aggr) {
3118 bf = ATH_TID_FIRST(atid);
3119 ATH_TID_REMOVE(atid, bf, bf_list);
3122 * Ensure it's definitely treated as a non-AMPDU
3123 * frame - this information may have been left
3124 * over from a previous attempt.
3126 bf->bf_state.bfs_aggr = 0;
3127 bf->bf_state.bfs_nframes = 1;
3129 /* Queue to the hardware */
3130 ath_tx_xmit_aggr(sc, an, txq, bf);
3131 DPRINTF(sc, ATH_DEBUG_SW_TX,
3135 DPRINTF(sc, ATH_DEBUG_SW_TX,
3136 "%s: ampdu; swq'ing\n",
3139 ath_tx_tid_sched(sc, atid);
3142 * If we're not doing A-MPDU, be prepared to direct dispatch
3143 * up to both limits if possible. This particular corner
3144 * case may end up with packet starvation between aggregate
3145 * traffic and non-aggregate traffic: we wnat to ensure
3146 * that non-aggregate stations get a few frames queued to the
3147 * hardware before the aggregate station(s) get their chance.
3149 * So if you only ever see a couple of frames direct dispatched
3150 * to the hardware from a non-AMPDU client, check both here
3151 * and in the software queue dispatcher to ensure that those
3152 * non-AMPDU stations get a fair chance to transmit.
3154 /* XXX TXQ locking */
3155 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3156 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3157 /* AMPDU not running, attempt direct dispatch */
3158 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3159 /* See if clrdmask needs to be set */
3160 ath_tx_update_clrdmask(sc, atid, bf);
3163 * Update the current leak count if
3164 * we're leaking frames; and set the
3165 * MORE flag as appropriate.
3167 ath_tx_leak_count_update(sc, atid, bf);
3170 * Dispatch the frame.
3172 ath_tx_xmit_normal(sc, txq, bf);
3175 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3176 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3177 ath_tx_tid_sched(sc, atid);
3182 * Only set the clrdmask bit if none of the nodes are currently
3185 * XXX TODO: go through all the callers and check to see
3186 * which are being called in the context of looping over all
3187 * TIDs (eg, if all tids are being paused, resumed, etc.)
3188 * That'll avoid O(n^2) complexity here.
3191 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3195 ATH_TX_LOCK_ASSERT(sc);
3197 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3198 if (an->an_tid[i].isfiltered == 1)
3205 * Configure the per-TID node state.
3207 * This likely belongs in if_ath_node.c but I can't think of anywhere
3208 * else to put it just yet.
3210 * This sets up the SLISTs and the mutex as appropriate.
3213 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3216 struct ath_tid *atid;
3218 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3219 atid = &an->an_tid[i];
3221 /* XXX now with this bzer(), is the field 0'ing needed? */
3222 bzero(atid, sizeof(*atid));
3224 TAILQ_INIT(&atid->tid_q);
3225 TAILQ_INIT(&atid->filtq.tid_q);
3228 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3229 atid->tx_buf[j] = NULL;
3230 atid->baw_head = atid->baw_tail = 0;
3233 atid->hwq_depth = 0;
3234 atid->cleanup_inprogress = 0;
3235 if (i == IEEE80211_NONQOS_TID)
3236 atid->ac = ATH_NONQOS_TID_AC;
3238 atid->ac = TID_TO_WME_AC(i);
3240 an->clrdmask = 1; /* Always start by setting this bit */
3244 * Pause the current TID. This stops packets from being transmitted
3247 * Since this is also called from upper layers as well as the driver,
3248 * it will get the TID lock.
3251 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3254 ATH_TX_LOCK_ASSERT(sc);
3256 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: [%6D]: tid=%d, paused = %d\n",
3258 tid->an->an_node.ni_macaddr, ":",
3264 * Unpause the current TID, and schedule it if needed.
3267 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3269 ATH_TX_LOCK_ASSERT(sc);
3272 * There's some odd places where ath_tx_tid_resume() is called
3273 * when it shouldn't be; this works around that particular issue
3274 * until it's actually resolved.
3276 if (tid->paused == 0) {
3277 device_printf(sc->sc_dev,
3278 "%s: [%6D]: tid=%d, paused=0?\n",
3280 tid->an->an_node.ni_macaddr, ":",
3286 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3287 "%s: [%6D]: tid=%d, unpaused = %d\n",
3289 tid->an->an_node.ni_macaddr, ":",
3297 * Override the clrdmask configuration for the next frame
3298 * from this TID, just to get the ball rolling.
3300 ath_tx_set_clrdmask(sc, tid->an);
3302 if (tid->axq_depth == 0)
3305 /* XXX isfiltered shouldn't ever be 0 at this point */
3306 if (tid->isfiltered == 1) {
3307 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3312 ath_tx_tid_sched(sc, tid);
3315 * Queue the software TX scheduler.
3317 ath_tx_swq_kick(sc);
3321 * Add the given ath_buf to the TID filtered frame list.
3322 * This requires the TID be filtered.
3325 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3329 ATH_TX_LOCK_ASSERT(sc);
3331 if (!tid->isfiltered)
3332 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3335 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3337 /* Set the retry bit and bump the retry counter */
3338 ath_tx_set_retry(sc, bf);
3339 sc->sc_stats.ast_tx_swfiltered++;
3341 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3345 * Handle a completed filtered frame from the given TID.
3346 * This just enables/pauses the filtered frame state if required
3347 * and appends the filtered frame to the filtered queue.
3350 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3354 ATH_TX_LOCK_ASSERT(sc);
3356 if (! tid->isfiltered) {
3357 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d; filter transition\n",
3358 __func__, tid->tid);
3359 tid->isfiltered = 1;
3360 ath_tx_tid_pause(sc, tid);
3363 /* Add the frame to the filter queue */
3364 ath_tx_tid_filt_addbuf(sc, tid, bf);
3368 * Complete the filtered frame TX completion.
3370 * If there are no more frames in the hardware queue, unpause/unfilter
3371 * the TID if applicable. Otherwise we will wait for a node PS transition
3375 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3380 ATH_TX_LOCK_ASSERT(sc);
3382 if (tid->hwq_depth != 0)
3385 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d, hwq=0, transition back\n",
3386 __func__, tid->tid);
3387 if (tid->isfiltered == 1) {
3388 tid->isfiltered = 0;
3392 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3393 ath_tx_set_clrdmask(sc, tid->an);
3395 /* XXX this is really quite inefficient */
3396 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3397 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3398 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3401 /* And only resume if we had paused before */
3403 ath_tx_tid_resume(sc, tid);
3407 * Called when a single (aggregate or otherwise) frame is completed.
3409 * Returns 0 if the buffer could be added to the filtered list
3410 * (cloned or otherwise), 1 if the buffer couldn't be added to the
3411 * filtered list (failed clone; expired retry) and the caller should
3412 * free it and handle it like a failure (eg by sending a BAR.)
3414 * since the buffer may be cloned, bf must be not touched after this
3415 * if the return value is 0.
3418 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3421 struct ath_buf *nbf;
3424 ATH_TX_LOCK_ASSERT(sc);
3427 * Don't allow a filtered frame to live forever.
3429 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3430 sc->sc_stats.ast_tx_swretrymax++;
3431 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3432 "%s: bf=%p, seqno=%d, exceeded retries\n",
3435 SEQNO(bf->bf_state.bfs_seqno));
3436 retval = 1; /* error */
3441 * A busy buffer can't be added to the retry list.
3442 * It needs to be cloned.
3444 if (bf->bf_flags & ATH_BUF_BUSY) {
3445 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3446 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3447 "%s: busy buffer clone: %p -> %p\n",
3454 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3455 "%s: busy buffer couldn't be cloned (%p)!\n",
3457 retval = 1; /* error */
3459 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3460 retval = 0; /* ok */
3463 ath_tx_tid_filt_comp_complete(sc, tid);
3469 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3470 struct ath_buf *bf_first, ath_bufhead *bf_q)
3472 struct ath_buf *bf, *bf_next, *nbf;
3474 ATH_TX_LOCK_ASSERT(sc);
3478 bf_next = bf->bf_next;
3479 bf->bf_next = NULL; /* Remove it from the aggr list */
3482 * Don't allow a filtered frame to live forever.
3484 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3485 sc->sc_stats.ast_tx_swretrymax++;
3486 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3487 "%s: tid=%d, bf=%p, seqno=%d, exceeded retries\n",
3491 SEQNO(bf->bf_state.bfs_seqno));
3492 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3496 if (bf->bf_flags & ATH_BUF_BUSY) {
3497 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3498 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3499 "%s: tid=%d, busy buffer cloned: %p -> %p, seqno=%d\n",
3500 __func__, tid->tid, bf, nbf, SEQNO(bf->bf_state.bfs_seqno));
3506 * If the buffer couldn't be cloned, add it to bf_q;
3507 * the caller will free the buffer(s) as required.
3510 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3511 "%s: tid=%d, buffer couldn't be cloned! (%p) seqno=%d\n",
3512 __func__, tid->tid, bf, SEQNO(bf->bf_state.bfs_seqno));
3513 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3515 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3521 ath_tx_tid_filt_comp_complete(sc, tid);
3525 * Suspend the queue because we need to TX a BAR.
3528 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3531 ATH_TX_LOCK_ASSERT(sc);
3533 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3534 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3540 /* We shouldn't be called when bar_tx is 1 */
3542 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3543 "%s: bar_tx is 1?!\n", __func__);
3546 /* If we've already been called, just be patient. */
3553 /* Only one pause, no matter how many frames fail */
3554 ath_tx_tid_pause(sc, tid);
3558 * We've finished with BAR handling - either we succeeded or
3559 * failed. Either way, unsuspend TX.
3562 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3565 ATH_TX_LOCK_ASSERT(sc);
3567 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3568 "%s: %6D: TID=%d, called\n",
3570 tid->an->an_node.ni_macaddr,
3574 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3575 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3576 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3577 __func__, tid->an->an_node.ni_macaddr, ":",
3578 tid->tid, tid->bar_tx, tid->bar_wait);
3581 tid->bar_tx = tid->bar_wait = 0;
3582 ath_tx_tid_resume(sc, tid);
3586 * Return whether we're ready to TX a BAR frame.
3588 * Requires the TID lock be held.
3591 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3594 ATH_TX_LOCK_ASSERT(sc);
3596 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3599 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3600 "%s: %6D: TID=%d, bar ready\n",
3602 tid->an->an_node.ni_macaddr,
3610 * Check whether the current TID is ready to have a BAR
3611 * TXed and if so, do the TX.
3613 * Since the TID/TXQ lock can't be held during a call to
3614 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3615 * sending the BAR and locking it again.
3617 * Eventually, the code to send the BAR should be broken out
3618 * from this routine so the lock doesn't have to be reacquired
3619 * just to be immediately dropped by the caller.
3622 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3624 struct ieee80211_tx_ampdu *tap;
3626 ATH_TX_LOCK_ASSERT(sc);
3628 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3629 "%s: %6D: TID=%d, called\n",
3631 tid->an->an_node.ni_macaddr,
3635 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3638 * This is an error condition!
3640 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3641 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3642 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3643 __func__, tid->an->an_node.ni_macaddr, ":",
3644 tid->tid, tid->bar_tx, tid->bar_wait);
3648 /* Don't do anything if we still have pending frames */
3649 if (tid->hwq_depth > 0) {
3650 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3651 "%s: %6D: TID=%d, hwq_depth=%d, waiting\n",
3653 tid->an->an_node.ni_macaddr,
3660 /* We're now about to TX */
3664 * Override the clrdmask configuration for the next frame,
3665 * just to get the ball rolling.
3667 ath_tx_set_clrdmask(sc, tid->an);
3670 * Calculate new BAW left edge, now that all frames have either
3671 * succeeded or failed.
3673 * XXX verify this is _actually_ the valid value to begin at!
3675 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3676 "%s: %6D: TID=%d, new BAW left edge=%d\n",
3678 tid->an->an_node.ni_macaddr,
3683 /* Try sending the BAR frame */
3684 /* We can't hold the lock here! */
3687 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3688 /* Success? Now we wait for notification that it's done */
3693 /* Failure? For now, warn loudly and continue */
3695 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3696 "%s: %6D: TID=%d, failed to TX BAR, continue!\n",
3697 __func__, tid->an->an_node.ni_macaddr, ":",
3699 ath_tx_tid_bar_unsuspend(sc, tid);
3703 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3704 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3707 ATH_TX_LOCK_ASSERT(sc);
3710 * If the current TID is running AMPDU, update
3713 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3714 bf->bf_state.bfs_dobaw) {
3716 * Only remove the frame from the BAW if it's
3717 * been transmitted at least once; this means
3718 * the frame was in the BAW to begin with.
3720 if (bf->bf_state.bfs_retries > 0) {
3721 ath_tx_update_baw(sc, an, tid, bf);
3722 bf->bf_state.bfs_dobaw = 0;
3726 * This has become a non-fatal error now
3728 if (! bf->bf_state.bfs_addedbaw)
3729 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3730 "%s: wasn't added: seqno %d\n",
3731 __func__, SEQNO(bf->bf_state.bfs_seqno));
3735 /* Strip it out of an aggregate list if it was in one */
3738 /* Insert on the free queue to be freed by the caller */
3739 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3743 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3744 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3746 struct ieee80211_node *ni = &an->an_node;
3747 struct ath_txq *txq;
3748 struct ieee80211_tx_ampdu *tap;
3750 txq = sc->sc_ac2q[tid->ac];
3751 tap = ath_tx_get_tx_tid(an, tid->tid);
3753 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3754 "%s: %s: %6D: bf=%p: addbaw=%d, dobaw=%d, "
3755 "seqno=%d, retry=%d\n",
3761 bf->bf_state.bfs_addedbaw,
3762 bf->bf_state.bfs_dobaw,
3763 SEQNO(bf->bf_state.bfs_seqno),
3764 bf->bf_state.bfs_retries);
3765 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3766 "%s: %s: %6D: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3774 txq->axq_aggr_depth);
3775 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3776 "%s: %s: %6D: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3787 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3788 "%s: %s: %6D: tid %d: "
3789 "sched=%d, paused=%d, "
3790 "incomp=%d, baw_head=%d, "
3791 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3797 tid->sched, tid->paused,
3798 tid->incomp, tid->baw_head,
3799 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3800 ni->ni_txseqs[tid->tid]);
3802 /* XXX Dump the frame, see what it is? */
3803 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
3804 ieee80211_dump_pkt(ni->ni_ic,
3805 mtod(bf->bf_m, const uint8_t *),
3806 bf->bf_m->m_len, 0, -1);
3810 * Free any packets currently pending in the software TX queue.
3812 * This will be called when a node is being deleted.
3814 * It can also be called on an active node during an interface
3815 * reset or state transition.
3817 * (From Linux/reference):
3819 * TODO: For frame(s) that are in the retry state, we will reuse the
3820 * sequence number(s) without setting the retry bit. The
3821 * alternative is to give up on these and BAR the receiver's window
3825 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3826 struct ath_tid *tid, ath_bufhead *bf_cq)
3829 struct ieee80211_tx_ampdu *tap;
3830 struct ieee80211_node *ni = &an->an_node;
3833 tap = ath_tx_get_tx_tid(an, tid->tid);
3835 ATH_TX_LOCK_ASSERT(sc);
3837 /* Walk the queue, free frames */
3840 bf = ATH_TID_FIRST(tid);
3846 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3850 ATH_TID_REMOVE(tid, bf, bf_list);
3851 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3854 /* And now, drain the filtered frame queue */
3857 bf = ATH_TID_FILT_FIRST(tid);
3862 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3866 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3867 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3871 * Override the clrdmask configuration for the next frame
3872 * in case there is some future transmission, just to get
3875 * This won't hurt things if the TID is about to be freed.
3877 ath_tx_set_clrdmask(sc, tid->an);
3880 * Now that it's completed, grab the TID lock and update
3881 * the sequence number and BAW window.
3882 * Because sequence numbers have been assigned to frames
3883 * that haven't been sent yet, it's entirely possible
3884 * we'll be called with some pending frames that have not
3887 * The cleaner solution is to do the sequence number allocation
3888 * when the packet is first transmitted - and thus the "retries"
3889 * check above would be enough to update the BAW/seqno.
3892 /* But don't do it for non-QoS TIDs */
3895 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3896 "%s: %6D: node %p: TID %d: sliding BAW left edge to %d\n",
3904 ni->ni_txseqs[tid->tid] = tap->txa_start;
3905 tid->baw_tail = tid->baw_head;
3910 * Reset the TID state. This must be only called once the node has
3911 * had its frames flushed from this TID, to ensure that no other
3912 * pause / unpause logic can kick in.
3915 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
3919 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
3920 tid->paused = tid->sched = tid->addba_tx_pending = 0;
3921 tid->incomp = tid->cleanup_inprogress = 0;
3925 * If we have a bar_wait set, we need to unpause the TID
3926 * here. Otherwise once cleanup has finished, the TID won't
3927 * have the right paused counter.
3929 * XXX I'm not going through resume here - I don't want the
3930 * node to be rescheuled just yet. This however should be
3933 if (tid->bar_wait) {
3934 if (tid->paused > 0) {
3940 * XXX same with a currently filtered TID.
3942 * Since this is being called during a flush, we assume that
3943 * the filtered frame list is actually empty.
3945 * XXX TODO: add in a check to ensure that the filtered queue
3946 * depth is actually 0!
3948 if (tid->isfiltered) {
3949 if (tid->paused > 0) {
3955 * Clear BAR, filtered frames, scheduled and ADDBA pending.
3956 * The TID may be going through cleanup from the last association
3957 * where things in the BAW are still in the hardware queue.
3961 tid->isfiltered = 0;
3963 tid->addba_tx_pending = 0;
3966 * XXX TODO: it may just be enough to walk the HWQs and mark
3967 * frames for that node as non-aggregate; or mark the ath_node
3968 * with something that indicates that aggregation is no longer
3969 * occuring. Then we can just toss the BAW complaints and
3970 * do a complete hard reset of state here - no pause, no
3971 * complete counter, etc.
3977 * Flush all software queued packets for the given node.
3979 * This occurs when a completion handler frees the last buffer
3980 * for a node, and the node is thus freed. This causes the node
3981 * to be cleaned up, which ends up calling ath_tx_node_flush.
3984 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
3992 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
3996 DPRINTF(sc, ATH_DEBUG_NODE,
3997 "%s: %6D: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
3998 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
4000 an->an_node.ni_macaddr,
4002 an->an_is_powersave,
4009 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
4010 struct ath_tid *atid = &an->an_tid[tid];
4013 ath_tx_tid_drain(sc, an, atid, &bf_cq);
4015 /* Remove this tid from the list of active tids */
4016 ath_tx_tid_unsched(sc, atid);
4018 /* Reset the per-TID pause, BAR, etc state */
4019 ath_tx_tid_reset(sc, atid);
4023 * Clear global leak count
4025 an->an_leak_count = 0;
4028 /* Handle completed frames */
4029 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4030 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4031 ath_tx_default_comp(sc, bf, 0);
4036 * Drain all the software TXQs currently with traffic queued.
4039 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
4041 struct ath_tid *tid;
4049 * Iterate over all active tids for the given txq,
4050 * flushing and unsched'ing them
4052 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
4053 tid = TAILQ_FIRST(&txq->axq_tidq);
4054 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
4055 ath_tx_tid_unsched(sc, tid);
4060 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4061 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4062 ath_tx_default_comp(sc, bf, 0);
4067 * Handle completion of non-aggregate session frames.
4069 * This (currently) doesn't implement software retransmission of
4070 * non-aggregate frames!
4072 * Software retransmission of non-aggregate frames needs to obey
4073 * the strict sequence number ordering, and drop any frames that
4076 * For now, filtered frames and frame transmission will cause
4077 * all kinds of issues. So we don't support them.
4079 * So anyone queuing frames via ath_tx_normal_xmit() or
4080 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4083 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4085 struct ieee80211_node *ni = bf->bf_node;
4086 struct ath_node *an = ATH_NODE(ni);
4087 int tid = bf->bf_state.bfs_tid;
4088 struct ath_tid *atid = &an->an_tid[tid];
4089 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4091 /* The TID state is protected behind the TXQ lock */
4094 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4095 __func__, bf, fail, atid->hwq_depth - 1);
4101 * If the frame was filtered, stick it on the filter frame
4102 * queue and complain about it. It shouldn't happen!
4104 if ((ts->ts_status & HAL_TXERR_FILT) ||
4105 (ts->ts_status != 0 && atid->isfiltered)) {
4106 DPRINTF(sc, ATH_DEBUG_SW_TX,
4107 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4111 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4114 if (atid->isfiltered)
4115 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4116 if (atid->hwq_depth < 0)
4117 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4118 __func__, atid->hwq_depth);
4120 /* If the TID is being cleaned up, track things */
4122 if (atid->cleanup_inprogress) {
4124 if (atid->incomp == 0) {
4125 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4126 "%s: TID %d: cleaned up! resume!\n",
4128 atid->cleanup_inprogress = 0;
4129 ath_tx_tid_resume(sc, atid);
4134 * If the queue is filtered, potentially mark it as complete
4135 * and reschedule it as needed.
4137 * This is required as there may be a subsequent TX descriptor
4138 * for this end-node that has CLRDMASK set, so it's quite possible
4139 * that a filtered frame will be followed by a non-filtered
4140 * (complete or otherwise) frame.
4142 * XXX should we do this before we complete the frame?
4144 if (atid->isfiltered)
4145 ath_tx_tid_filt_comp_complete(sc, atid);
4149 * punt to rate control if we're not being cleaned up
4150 * during a hw queue drain and the frame wanted an ACK.
4152 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4153 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4154 ts, bf->bf_state.bfs_pktlen,
4155 1, (ts->ts_status == 0) ? 0 : 1);
4157 ath_tx_default_comp(sc, bf, fail);
4161 * Handle cleanup of aggregate session packets that aren't
4164 * There's no need to update the BAW here - the session is being
4168 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4170 struct ieee80211_node *ni = bf->bf_node;
4171 struct ath_node *an = ATH_NODE(ni);
4172 int tid = bf->bf_state.bfs_tid;
4173 struct ath_tid *atid = &an->an_tid[tid];
4175 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4176 __func__, tid, atid->incomp);
4182 if (bf->bf_state.bfs_dobaw) {
4183 ath_tx_update_baw(sc, an, atid, bf);
4184 if (!bf->bf_state.bfs_addedbaw)
4185 DPRINTF(sc, ATH_DEBUG_SW_TX,
4186 "%s: wasn't added: seqno %d\n",
4187 __func__, SEQNO(bf->bf_state.bfs_seqno));
4190 if (atid->incomp == 0) {
4191 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4192 "%s: TID %d: cleaned up! resume!\n",
4194 atid->cleanup_inprogress = 0;
4195 ath_tx_tid_resume(sc, atid);
4199 ath_tx_default_comp(sc, bf, 0);
4204 * This as it currently stands is a bit dumb. Ideally we'd just
4205 * fail the frame the normal way and have it permanently fail
4206 * via the normal aggregate completion path.
4209 ath_tx_tid_cleanup_frame(struct ath_softc *sc, struct ath_node *an,
4210 int tid, struct ath_buf *bf_head, ath_bufhead *bf_cq)
4212 struct ath_tid *atid = &an->an_tid[tid];
4213 struct ath_buf *bf, *bf_next;
4215 ATH_TX_LOCK_ASSERT(sc);
4218 * Remove this frame from the queue.
4220 ATH_TID_REMOVE(atid, bf_head, bf_list);
4223 * Loop over all the frames in the aggregate.
4226 while (bf != NULL) {
4227 bf_next = bf->bf_next; /* next aggregate frame, or NULL */
4230 * If it's been added to the BAW we need to kick
4231 * it out of the BAW before we continue.
4233 * XXX if it's an aggregate, assert that it's in the
4234 * BAW - we shouldn't have it be in an aggregate
4237 if (bf->bf_state.bfs_addedbaw) {
4238 ath_tx_update_baw(sc, an, atid, bf);
4239 bf->bf_state.bfs_dobaw = 0;
4243 * Give it the default completion handler.
4245 bf->bf_comp = ath_tx_normal_comp;
4249 * Add it to the list to free.
4251 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4254 * Now advance to the next frame in the aggregate.
4261 * Performs transmit side cleanup when TID changes from aggregated to
4262 * unaggregated and during reassociation.
4264 * For now, this just tosses everything from the TID software queue
4265 * whether or not it has been retried and marks the TID as
4266 * pending completion if there's anything for this TID queued to
4269 * The caller is responsible for pausing the TID and unpausing the
4270 * TID if no cleanup was required. Otherwise the cleanup path will
4271 * unpause the TID once the last hardware queued frame is completed.
4274 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4277 struct ath_tid *atid = &an->an_tid[tid];
4278 struct ath_buf *bf, *bf_next;
4280 ATH_TX_LOCK_ASSERT(sc);
4282 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4283 "%s: TID %d: called; inprogress=%d\n", __func__, tid,
4284 atid->cleanup_inprogress);
4287 * Move the filtered frames to the TX queue, before
4288 * we run off and discard/process things.
4291 /* XXX this is really quite inefficient */
4292 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4293 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4294 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4298 * Update the frames in the software TX queue:
4300 * + Discard retry frames in the queue
4301 * + Fix the completion function to be non-aggregate
4303 bf = ATH_TID_FIRST(atid);
4306 * Grab the next frame in the list, we may
4307 * be fiddling with the list.
4309 bf_next = TAILQ_NEXT(bf, bf_list);
4312 * Free the frame and all subframes.
4314 ath_tx_tid_cleanup_frame(sc, an, tid, bf, bf_cq);
4323 * If there's anything in the hardware queue we wait
4324 * for the TID HWQ to empty.
4326 if (atid->hwq_depth > 0) {
4328 * XXX how about we kill atid->incomp, and instead
4329 * replace it with a macro that checks that atid->hwq_depth
4332 atid->incomp = atid->hwq_depth;
4333 atid->cleanup_inprogress = 1;
4336 if (atid->cleanup_inprogress)
4337 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4338 "%s: TID %d: cleanup needed: %d packets\n",
4339 __func__, tid, atid->incomp);
4341 /* Owner now must free completed frames */
4344 static struct ath_buf *
4345 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4346 struct ath_tid *tid, struct ath_buf *bf)
4348 struct ath_buf *nbf;
4352 * Clone the buffer. This will handle the dma unmap and
4353 * copy the node reference to the new buffer. If this
4354 * works out, 'bf' will have no DMA mapping, no mbuf
4355 * pointer and no node reference.
4357 nbf = ath_buf_clone(sc, bf);
4360 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4365 /* Failed to clone */
4366 DPRINTF(sc, ATH_DEBUG_XMIT,
4367 "%s: failed to clone a busy buffer\n",
4372 /* Setup the dma for the new buffer */
4373 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4375 DPRINTF(sc, ATH_DEBUG_XMIT,
4376 "%s: failed to setup dma for clone\n",
4379 * Put this at the head of the list, not tail;
4380 * that way it doesn't interfere with the
4381 * busy buffer logic (which uses the tail of
4385 ath_returnbuf_head(sc, nbf);
4386 ATH_TXBUF_UNLOCK(sc);
4390 /* Update BAW if required, before we free the original buf */
4391 if (bf->bf_state.bfs_dobaw)
4392 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4394 /* Free original buffer; return new buffer */
4395 ath_freebuf(sc, bf);
4401 * Handle retrying an unaggregate frame in an aggregate
4404 * If too many retries occur, pause the TID, wait for
4405 * any further retransmits (as there's no reason why
4406 * non-aggregate frames in an aggregate session are
4407 * transmitted in-order; they just have to be in-BAW)
4408 * and then queue a BAR.
4411 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4413 struct ieee80211_node *ni = bf->bf_node;
4414 struct ath_node *an = ATH_NODE(ni);
4415 int tid = bf->bf_state.bfs_tid;
4416 struct ath_tid *atid = &an->an_tid[tid];
4417 struct ieee80211_tx_ampdu *tap;
4421 tap = ath_tx_get_tx_tid(an, tid);
4424 * If the buffer is marked as busy, we can't directly
4425 * reuse it. Instead, try to clone the buffer.
4426 * If the clone is successful, recycle the old buffer.
4427 * If the clone is unsuccessful, set bfs_retries to max
4428 * to force the next bit of code to free the buffer
4431 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4432 (bf->bf_flags & ATH_BUF_BUSY)) {
4433 struct ath_buf *nbf;
4434 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4436 /* bf has been freed at this point */
4439 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4442 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4443 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4444 "%s: exceeded retries; seqno %d\n",
4445 __func__, SEQNO(bf->bf_state.bfs_seqno));
4446 sc->sc_stats.ast_tx_swretrymax++;
4448 /* Update BAW anyway */
4449 if (bf->bf_state.bfs_dobaw) {
4450 ath_tx_update_baw(sc, an, atid, bf);
4451 if (! bf->bf_state.bfs_addedbaw)
4452 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4453 "%s: wasn't added: seqno %d\n",
4454 __func__, SEQNO(bf->bf_state.bfs_seqno));
4456 bf->bf_state.bfs_dobaw = 0;
4458 /* Suspend the TX queue and get ready to send the BAR */
4459 ath_tx_tid_bar_suspend(sc, atid);
4461 /* Send the BAR if there are no other frames waiting */
4462 if (ath_tx_tid_bar_tx_ready(sc, atid))
4463 ath_tx_tid_bar_tx(sc, atid);
4467 /* Free buffer, bf is free after this call */
4468 ath_tx_default_comp(sc, bf, 0);
4473 * This increments the retry counter as well as
4474 * sets the retry flag in the ath_buf and packet
4477 ath_tx_set_retry(sc, bf);
4478 sc->sc_stats.ast_tx_swretries++;
4481 * Insert this at the head of the queue, so it's
4482 * retried before any current/subsequent frames.
4484 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4485 ath_tx_tid_sched(sc, atid);
4486 /* Send the BAR if there are no other frames waiting */
4487 if (ath_tx_tid_bar_tx_ready(sc, atid))
4488 ath_tx_tid_bar_tx(sc, atid);
4494 * Common code for aggregate excessive retry/subframe retry.
4495 * If retrying, queues buffers to bf_q. If not, frees the
4498 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4501 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4504 struct ieee80211_node *ni = bf->bf_node;
4505 struct ath_node *an = ATH_NODE(ni);
4506 int tid = bf->bf_state.bfs_tid;
4507 struct ath_tid *atid = &an->an_tid[tid];
4509 ATH_TX_LOCK_ASSERT(sc);
4511 /* XXX clr11naggr should be done for all subframes */
4512 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4513 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4515 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4518 * If the buffer is marked as busy, we can't directly
4519 * reuse it. Instead, try to clone the buffer.
4520 * If the clone is successful, recycle the old buffer.
4521 * If the clone is unsuccessful, set bfs_retries to max
4522 * to force the next bit of code to free the buffer
4525 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4526 (bf->bf_flags & ATH_BUF_BUSY)) {
4527 struct ath_buf *nbf;
4528 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4530 /* bf has been freed at this point */
4533 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4536 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4537 sc->sc_stats.ast_tx_swretrymax++;
4538 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4539 "%s: max retries: seqno %d\n",
4540 __func__, SEQNO(bf->bf_state.bfs_seqno));
4541 ath_tx_update_baw(sc, an, atid, bf);
4542 if (!bf->bf_state.bfs_addedbaw)
4543 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4544 "%s: wasn't added: seqno %d\n",
4545 __func__, SEQNO(bf->bf_state.bfs_seqno));
4546 bf->bf_state.bfs_dobaw = 0;
4550 ath_tx_set_retry(sc, bf);
4551 sc->sc_stats.ast_tx_swretries++;
4552 bf->bf_next = NULL; /* Just to make sure */
4554 /* Clear the aggregate state */
4555 bf->bf_state.bfs_aggr = 0;
4556 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4557 bf->bf_state.bfs_nframes = 1;
4559 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4564 * error pkt completion for an aggregate destination
4567 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4568 struct ath_tid *tid)
4570 struct ieee80211_node *ni = bf_first->bf_node;
4571 struct ath_node *an = ATH_NODE(ni);
4572 struct ath_buf *bf_next, *bf;
4575 struct ieee80211_tx_ampdu *tap;
4582 * Update rate control - all frames have failed.
4584 * XXX use the length in the first frame in the series;
4585 * XXX just so things are consistent for now.
4587 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4588 &bf_first->bf_status.ds_txstat,
4589 bf_first->bf_state.bfs_pktlen,
4590 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4593 tap = ath_tx_get_tx_tid(an, tid->tid);
4594 sc->sc_stats.ast_tx_aggr_failall++;
4596 /* Retry all subframes */
4599 bf_next = bf->bf_next;
4600 bf->bf_next = NULL; /* Remove it from the aggr list */
4601 sc->sc_stats.ast_tx_aggr_fail++;
4602 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4605 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4610 /* Prepend all frames to the beginning of the queue */
4611 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4612 TAILQ_REMOVE(&bf_q, bf, bf_list);
4613 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4617 * Schedule the TID to be re-tried.
4619 ath_tx_tid_sched(sc, tid);
4622 * send bar if we dropped any frames
4624 * Keep the txq lock held for now, as we need to ensure
4625 * that ni_txseqs[] is consistent (as it's being updated
4626 * in the ifnet TX context or raw TX context.)
4629 /* Suspend the TX queue and get ready to send the BAR */
4630 ath_tx_tid_bar_suspend(sc, tid);
4634 * Send BAR if required
4636 if (ath_tx_tid_bar_tx_ready(sc, tid))
4637 ath_tx_tid_bar_tx(sc, tid);
4641 /* Complete frames which errored out */
4642 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4643 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4644 ath_tx_default_comp(sc, bf, 0);
4649 * Handle clean-up of packets from an aggregate list.
4651 * There's no need to update the BAW here - the session is being
4655 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4657 struct ath_buf *bf, *bf_next;
4658 struct ieee80211_node *ni = bf_first->bf_node;
4659 struct ath_node *an = ATH_NODE(ni);
4660 int tid = bf_first->bf_state.bfs_tid;
4661 struct ath_tid *atid = &an->an_tid[tid];
4668 /* Update the BAW */
4672 if (bf->bf_state.bfs_dobaw) {
4673 ath_tx_update_baw(sc, an, atid, bf);
4674 if (!bf->bf_state.bfs_addedbaw)
4675 DPRINTF(sc, ATH_DEBUG_SW_TX,
4676 "%s: wasn't added: seqno %d\n",
4677 __func__, SEQNO(bf->bf_state.bfs_seqno));
4682 if (atid->incomp == 0) {
4683 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4684 "%s: TID %d: cleaned up! resume!\n",
4686 atid->cleanup_inprogress = 0;
4687 ath_tx_tid_resume(sc, atid);
4690 /* Send BAR if required */
4691 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4693 * XXX TODO: we should likely just tear down the BAR state here,
4694 * rather than sending a BAR.
4696 if (ath_tx_tid_bar_tx_ready(sc, atid))
4697 ath_tx_tid_bar_tx(sc, atid);
4701 /* Handle frame completion as individual frames */
4704 bf_next = bf->bf_next;
4706 ath_tx_default_comp(sc, bf, 1);
4712 * Handle completion of an set of aggregate frames.
4714 * Note: the completion handler is the last descriptor in the aggregate,
4715 * not the last descriptor in the first frame.
4718 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4721 //struct ath_desc *ds = bf->bf_lastds;
4722 struct ieee80211_node *ni = bf_first->bf_node;
4723 struct ath_node *an = ATH_NODE(ni);
4724 int tid = bf_first->bf_state.bfs_tid;
4725 struct ath_tid *atid = &an->an_tid[tid];
4726 struct ath_tx_status ts;
4727 struct ieee80211_tx_ampdu *tap;
4733 struct ath_buf *bf, *bf_next;
4736 int nframes = 0, nbad = 0, nf;
4738 /* XXX there's too much on the stack? */
4739 struct ath_rc_series rc[ATH_RC_NUM];
4742 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4743 __func__, atid->hwq_depth);
4746 * Take a copy; this may be needed -after- bf_first
4747 * has been completed and freed.
4749 ts = bf_first->bf_status.ds_txstat;
4754 /* The TID state is kept behind the TXQ lock */
4758 if (atid->hwq_depth < 0)
4759 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4760 __func__, atid->hwq_depth);
4763 * If the TID is filtered, handle completing the filter
4764 * transition before potentially kicking it to the cleanup
4767 * XXX this is duplicate work, ew.
4769 if (atid->isfiltered)
4770 ath_tx_tid_filt_comp_complete(sc, atid);
4773 * Punt cleanup to the relevant function, not our problem now
4775 if (atid->cleanup_inprogress) {
4776 if (atid->isfiltered)
4777 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4778 "%s: isfiltered=1, normal_comp?\n",
4781 ath_tx_comp_cleanup_aggr(sc, bf_first);
4786 * If the frame is filtered, transition to filtered frame
4787 * mode and add this to the filtered frame list.
4789 * XXX TODO: figure out how this interoperates with
4790 * BAR, pause and cleanup states.
4792 if ((ts.ts_status & HAL_TXERR_FILT) ||
4793 (ts.ts_status != 0 && atid->isfiltered)) {
4795 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4796 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4797 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4799 /* Remove from BAW */
4800 TAILQ_FOREACH_SAFE(bf, &bf_cq, bf_list, bf_next) {
4801 if (bf->bf_state.bfs_addedbaw)
4803 if (bf->bf_state.bfs_dobaw) {
4804 ath_tx_update_baw(sc, an, atid, bf);
4805 if (!bf->bf_state.bfs_addedbaw)
4806 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4807 "%s: wasn't added: seqno %d\n",
4809 SEQNO(bf->bf_state.bfs_seqno));
4811 bf->bf_state.bfs_dobaw = 0;
4814 * If any intermediate frames in the BAW were dropped when
4815 * handling filtering things, send a BAR.
4818 ath_tx_tid_bar_suspend(sc, atid);
4821 * Finish up by sending a BAR if required and freeing
4822 * the frames outside of the TX lock.
4824 goto finish_send_bar;
4828 * XXX for now, use the first frame in the aggregate for
4829 * XXX rate control completion; it's at least consistent.
4831 pktlen = bf_first->bf_state.bfs_pktlen;
4834 * Handle errors first!
4836 * Here, handle _any_ error as a "exceeded retries" error.
4837 * Later on (when filtered frames are to be specially handled)
4838 * it'll have to be expanded.
4841 if (ts.ts_status & HAL_TXERR_XRETRY) {
4843 if (ts.ts_status != 0) {
4845 ath_tx_comp_aggr_error(sc, bf_first, atid);
4849 tap = ath_tx_get_tx_tid(an, tid);
4852 * extract starting sequence and block-ack bitmap
4854 /* XXX endian-ness of seq_st, ba? */
4855 seq_st = ts.ts_seqnum;
4856 hasba = !! (ts.ts_flags & HAL_TX_BA);
4857 tx_ok = (ts.ts_status == 0);
4858 isaggr = bf_first->bf_state.bfs_aggr;
4859 ba[0] = ts.ts_ba_low;
4860 ba[1] = ts.ts_ba_high;
4863 * Copy the TX completion status and the rate control
4864 * series from the first descriptor, as it may be freed
4865 * before the rate control code can get its grubby fingers
4868 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4870 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4871 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4872 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4873 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4874 isaggr, seq_st, hasba, ba[0], ba[1]);
4877 * The reference driver doesn't do this; it simply ignores
4878 * this check in its entirety.
4880 * I've seen this occur when using iperf to send traffic
4881 * out tid 1 - the aggregate frames are all marked as TID 1,
4882 * but the TXSTATUS has TID=0. So, let's just ignore this
4886 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4887 if (tid != ts.ts_tid) {
4888 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4889 __func__, tid, ts.ts_tid);
4894 /* AR5416 BA bug; this requires an interface reset */
4895 if (isaggr && tx_ok && (! hasba)) {
4896 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4897 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
4899 __func__, hasba, tx_ok, isaggr, seq_st);
4900 /* XXX TODO: schedule an interface reset */
4902 ath_printtxbuf(sc, bf_first,
4903 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
4908 * Walk the list of frames, figure out which ones were correctly
4909 * sent and which weren't.
4912 nf = bf_first->bf_state.bfs_nframes;
4914 /* bf_first is going to be invalid once this list is walked */
4918 * Walk the list of completed frames and determine
4919 * which need to be completed and which need to be
4922 * For completed frames, the completion functions need
4923 * to be called at the end of this function as the last
4924 * node reference may free the node.
4926 * Finally, since the TXQ lock can't be held during the
4927 * completion callback (to avoid lock recursion),
4928 * the completion calls have to be done outside of the
4933 ba_index = ATH_BA_INDEX(seq_st,
4934 SEQNO(bf->bf_state.bfs_seqno));
4935 bf_next = bf->bf_next;
4936 bf->bf_next = NULL; /* Remove it from the aggr list */
4938 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4939 "%s: checking bf=%p seqno=%d; ack=%d\n",
4940 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
4941 ATH_BA_ISSET(ba, ba_index));
4943 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
4944 sc->sc_stats.ast_tx_aggr_ok++;
4945 ath_tx_update_baw(sc, an, atid, bf);
4946 bf->bf_state.bfs_dobaw = 0;
4947 if (!bf->bf_state.bfs_addedbaw)
4948 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4949 "%s: wasn't added: seqno %d\n",
4950 __func__, SEQNO(bf->bf_state.bfs_seqno));
4952 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4954 sc->sc_stats.ast_tx_aggr_fail++;
4955 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4958 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4966 * Now that the BAW updates have been done, unlock
4968 * txseq is grabbed before the lock is released so we
4969 * have a consistent view of what -was- in the BAW.
4970 * Anything after this point will not yet have been
4973 txseq = tap->txa_start;
4977 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4978 "%s: num frames seen=%d; bf nframes=%d\n",
4979 __func__, nframes, nf);
4982 * Now we know how many frames were bad, call the rate
4986 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
4990 * send bar if we dropped any frames
4993 /* Suspend the TX queue and get ready to send the BAR */
4995 ath_tx_tid_bar_suspend(sc, atid);
4999 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5000 "%s: txa_start now %d\n", __func__, tap->txa_start);
5004 /* Prepend all frames to the beginning of the queue */
5005 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
5006 TAILQ_REMOVE(&bf_q, bf, bf_list);
5007 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
5011 * Reschedule to grab some further frames.
5013 ath_tx_tid_sched(sc, atid);
5016 * If the queue is filtered, re-schedule as required.
5018 * This is required as there may be a subsequent TX descriptor
5019 * for this end-node that has CLRDMASK set, so it's quite possible
5020 * that a filtered frame will be followed by a non-filtered
5021 * (complete or otherwise) frame.
5023 * XXX should we do this before we complete the frame?
5025 if (atid->isfiltered)
5026 ath_tx_tid_filt_comp_complete(sc, atid);
5031 * Send BAR if required
5033 if (ath_tx_tid_bar_tx_ready(sc, atid))
5034 ath_tx_tid_bar_tx(sc, atid);
5038 /* Do deferred completion */
5039 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5040 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5041 ath_tx_default_comp(sc, bf, 0);
5046 * Handle completion of unaggregated frames in an ADDBA
5049 * Fail is set to 1 if the entry is being freed via a call to
5050 * ath_tx_draintxq().
5053 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
5055 struct ieee80211_node *ni = bf->bf_node;
5056 struct ath_node *an = ATH_NODE(ni);
5057 int tid = bf->bf_state.bfs_tid;
5058 struct ath_tid *atid = &an->an_tid[tid];
5059 struct ath_tx_status ts;
5063 * Take a copy of this; filtering/cloning the frame may free the
5066 ts = bf->bf_status.ds_txstat;
5069 * Update rate control status here, before we possibly
5070 * punt to retry or cleanup.
5072 * Do it outside of the TXQ lock.
5074 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
5075 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
5076 &bf->bf_status.ds_txstat,
5077 bf->bf_state.bfs_pktlen,
5078 1, (ts.ts_status == 0) ? 0 : 1);
5081 * This is called early so atid->hwq_depth can be tracked.
5082 * This unfortunately means that it's released and regrabbed
5083 * during retry and cleanup. That's rather inefficient.
5087 if (tid == IEEE80211_NONQOS_TID)
5088 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
5090 DPRINTF(sc, ATH_DEBUG_SW_TX,
5091 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
5092 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
5093 SEQNO(bf->bf_state.bfs_seqno));
5096 if (atid->hwq_depth < 0)
5097 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
5098 __func__, atid->hwq_depth);
5101 * If the TID is filtered, handle completing the filter
5102 * transition before potentially kicking it to the cleanup
5105 if (atid->isfiltered)
5106 ath_tx_tid_filt_comp_complete(sc, atid);
5109 * If a cleanup is in progress, punt to comp_cleanup;
5110 * rather than handling it here. It's thus their
5111 * responsibility to clean up, call the completion
5112 * function in net80211, etc.
5114 if (atid->cleanup_inprogress) {
5115 if (atid->isfiltered)
5116 DPRINTF(sc, ATH_DEBUG_SW_TX,
5117 "%s: isfiltered=1, normal_comp?\n",
5120 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
5122 ath_tx_comp_cleanup_unaggr(sc, bf);
5127 * XXX TODO: how does cleanup, BAR and filtered frame handling
5130 * If the frame is filtered OR if it's any failure but
5131 * the TID is filtered, the frame must be added to the
5132 * filtered frame list.
5134 * However - a busy buffer can't be added to the filtered
5135 * list as it will end up being recycled without having
5136 * been made available for the hardware.
5138 if ((ts.ts_status & HAL_TXERR_FILT) ||
5139 (ts.ts_status != 0 && atid->isfiltered)) {
5143 DPRINTF(sc, ATH_DEBUG_SW_TX,
5144 "%s: isfiltered=1, fail=%d\n",
5146 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5148 * If freeframe=0 then bf is no longer ours; don't
5152 /* Remove from BAW */
5153 if (bf->bf_state.bfs_addedbaw)
5155 if (bf->bf_state.bfs_dobaw) {
5156 ath_tx_update_baw(sc, an, atid, bf);
5157 if (!bf->bf_state.bfs_addedbaw)
5158 DPRINTF(sc, ATH_DEBUG_SW_TX,
5159 "%s: wasn't added: seqno %d\n",
5160 __func__, SEQNO(bf->bf_state.bfs_seqno));
5162 bf->bf_state.bfs_dobaw = 0;
5166 * If the frame couldn't be filtered, treat it as a drop and
5167 * prepare to send a BAR.
5169 if (freeframe && drops)
5170 ath_tx_tid_bar_suspend(sc, atid);
5173 * Send BAR if required
5175 if (ath_tx_tid_bar_tx_ready(sc, atid))
5176 ath_tx_tid_bar_tx(sc, atid);
5180 * If freeframe is set, then the frame couldn't be
5181 * cloned and bf is still valid. Just complete/free it.
5184 ath_tx_default_comp(sc, bf, fail);
5189 * Don't bother with the retry check if all frames
5190 * are being failed (eg during queue deletion.)
5193 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5195 if (fail == 0 && ts.ts_status != 0) {
5197 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5199 ath_tx_aggr_retry_unaggr(sc, bf);
5203 /* Success? Complete */
5204 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5205 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5206 if (bf->bf_state.bfs_dobaw) {
5207 ath_tx_update_baw(sc, an, atid, bf);
5208 bf->bf_state.bfs_dobaw = 0;
5209 if (!bf->bf_state.bfs_addedbaw)
5210 DPRINTF(sc, ATH_DEBUG_SW_TX,
5211 "%s: wasn't added: seqno %d\n",
5212 __func__, SEQNO(bf->bf_state.bfs_seqno));
5216 * If the queue is filtered, re-schedule as required.
5218 * This is required as there may be a subsequent TX descriptor
5219 * for this end-node that has CLRDMASK set, so it's quite possible
5220 * that a filtered frame will be followed by a non-filtered
5221 * (complete or otherwise) frame.
5223 * XXX should we do this before we complete the frame?
5225 if (atid->isfiltered)
5226 ath_tx_tid_filt_comp_complete(sc, atid);
5229 * Send BAR if required
5231 if (ath_tx_tid_bar_tx_ready(sc, atid))
5232 ath_tx_tid_bar_tx(sc, atid);
5236 ath_tx_default_comp(sc, bf, fail);
5237 /* bf is freed at this point */
5241 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5243 if (bf->bf_state.bfs_aggr)
5244 ath_tx_aggr_comp_aggr(sc, bf, fail);
5246 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5250 * Schedule some packets from the given node/TID to the hardware.
5252 * This is the aggregate version.
5255 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5256 struct ath_tid *tid)
5259 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5260 struct ieee80211_tx_ampdu *tap;
5261 ATH_AGGR_STATUS status;
5264 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5265 ATH_TX_LOCK_ASSERT(sc);
5268 * XXX TODO: If we're called for a queue that we're leaking frames to,
5269 * ensure we only leak one.
5272 tap = ath_tx_get_tx_tid(an, tid->tid);
5274 if (tid->tid == IEEE80211_NONQOS_TID)
5275 DPRINTF(sc, ATH_DEBUG_SW_TX,
5276 "%s: called for TID=NONQOS_TID?\n", __func__);
5279 status = ATH_AGGR_DONE;
5282 * If the upper layer has paused the TID, don't
5283 * queue any further packets.
5285 * This can also occur from the completion task because
5286 * of packet loss; but as its serialised with this code,
5287 * it won't "appear" half way through queuing packets.
5289 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5292 bf = ATH_TID_FIRST(tid);
5298 * If the packet doesn't fall within the BAW (eg a NULL
5299 * data frame), schedule it directly; continue.
5301 if (! bf->bf_state.bfs_dobaw) {
5302 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5303 "%s: non-baw packet\n",
5305 ATH_TID_REMOVE(tid, bf, bf_list);
5307 if (bf->bf_state.bfs_nframes > 1)
5308 DPRINTF(sc, ATH_DEBUG_SW_TX,
5309 "%s: aggr=%d, nframes=%d\n",
5311 bf->bf_state.bfs_aggr,
5312 bf->bf_state.bfs_nframes);
5315 * This shouldn't happen - such frames shouldn't
5316 * ever have been queued as an aggregate in the
5317 * first place. However, make sure the fields
5318 * are correctly setup just to be totally sure.
5320 bf->bf_state.bfs_aggr = 0;
5321 bf->bf_state.bfs_nframes = 1;
5323 /* Update CLRDMASK just before this frame is queued */
5324 ath_tx_update_clrdmask(sc, tid, bf);
5326 ath_tx_do_ratelookup(sc, bf);
5327 ath_tx_calc_duration(sc, bf);
5328 ath_tx_calc_protection(sc, bf);
5329 ath_tx_set_rtscts(sc, bf);
5330 ath_tx_rate_fill_rcflags(sc, bf);
5331 ath_tx_setds(sc, bf);
5332 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5334 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5336 /* Queue the packet; continue */
5343 * Do a rate control lookup on the first frame in the
5344 * list. The rate control code needs that to occur
5345 * before it can determine whether to TX.
5346 * It's inaccurate because the rate control code doesn't
5347 * really "do" aggregate lookups, so it only considers
5348 * the size of the first frame.
5350 ath_tx_do_ratelookup(sc, bf);
5351 bf->bf_state.bfs_rc[3].rix = 0;
5352 bf->bf_state.bfs_rc[3].tries = 0;
5354 ath_tx_calc_duration(sc, bf);
5355 ath_tx_calc_protection(sc, bf);
5357 ath_tx_set_rtscts(sc, bf);
5358 ath_tx_rate_fill_rcflags(sc, bf);
5360 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5362 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5363 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5366 * No frames to be picked up - out of BAW
5368 if (TAILQ_EMPTY(&bf_q))
5372 * This assumes that the descriptor list in the ath_bufhead
5373 * are already linked together via bf_next pointers.
5375 bf = TAILQ_FIRST(&bf_q);
5377 if (status == ATH_AGGR_8K_LIMITED)
5378 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5381 * If it's the only frame send as non-aggregate
5382 * assume that ath_tx_form_aggr() has checked
5383 * whether it's in the BAW and added it appropriately.
5385 if (bf->bf_state.bfs_nframes == 1) {
5386 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5387 "%s: single-frame aggregate\n", __func__);
5389 /* Update CLRDMASK just before this frame is queued */
5390 ath_tx_update_clrdmask(sc, tid, bf);
5392 bf->bf_state.bfs_aggr = 0;
5393 bf->bf_state.bfs_ndelim = 0;
5394 ath_tx_setds(sc, bf);
5395 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5396 if (status == ATH_AGGR_BAW_CLOSED)
5397 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5399 sc->sc_aggr_stats.aggr_single_pkt++;
5401 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5402 "%s: multi-frame aggregate: %d frames, "
5404 __func__, bf->bf_state.bfs_nframes,
5405 bf->bf_state.bfs_al);
5406 bf->bf_state.bfs_aggr = 1;
5407 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5408 sc->sc_aggr_stats.aggr_aggr_pkt++;
5410 /* Update CLRDMASK just before this frame is queued */
5411 ath_tx_update_clrdmask(sc, tid, bf);
5414 * Calculate the duration/protection as required.
5416 ath_tx_calc_duration(sc, bf);
5417 ath_tx_calc_protection(sc, bf);
5420 * Update the rate and rtscts information based on the
5421 * rate decision made by the rate control code;
5422 * the first frame in the aggregate needs it.
5424 ath_tx_set_rtscts(sc, bf);
5427 * Setup the relevant descriptor fields
5428 * for aggregation. The first descriptor
5429 * already points to the rest in the chain.
5431 ath_tx_setds_11n(sc, bf);
5435 /* Set completion handler, multi-frame aggregate or not */
5436 bf->bf_comp = ath_tx_aggr_comp;
5438 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5439 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5442 * Update leak count and frame config if were leaking frames.
5444 * XXX TODO: it should update all frames in an aggregate
5447 ath_tx_leak_count_update(sc, tid, bf);
5450 ath_tx_handoff(sc, txq, bf);
5452 /* Track outstanding buffer count to hardware */
5453 /* aggregates are "one" buffer */
5457 * Break out if ath_tx_form_aggr() indicated
5458 * there can't be any further progress (eg BAW is full.)
5459 * Checking for an empty txq is done above.
5461 * XXX locking on txq here?
5463 /* XXX TXQ locking */
5464 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5465 (status == ATH_AGGR_BAW_CLOSED ||
5466 status == ATH_AGGR_LEAK_CLOSED))
5472 * Schedule some packets from the given node/TID to the hardware.
5474 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5475 * It just dumps frames into the TXQ. We should limit how deep
5476 * the transmit queue can grow for frames dispatched to the given
5479 * To avoid locking issues, either we need to own the TXQ lock
5480 * at this point, or we need to pass in the maximum frame count
5484 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5485 struct ath_tid *tid)
5488 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5490 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5491 __func__, an, tid->tid);
5493 ATH_TX_LOCK_ASSERT(sc);
5495 /* Check - is AMPDU pending or running? then print out something */
5496 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5497 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5498 __func__, tid->tid);
5499 if (ath_tx_ampdu_running(sc, an, tid->tid))
5500 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5501 __func__, tid->tid);
5506 * If the upper layers have paused the TID, don't
5507 * queue any further packets.
5509 * XXX if we are leaking frames, make sure we decrement
5510 * that counter _and_ we continue here.
5512 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5515 bf = ATH_TID_FIRST(tid);
5520 ATH_TID_REMOVE(tid, bf, bf_list);
5523 if (tid->tid != bf->bf_state.bfs_tid) {
5524 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5525 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5528 /* Normal completion handler */
5529 bf->bf_comp = ath_tx_normal_comp;
5532 * Override this for now, until the non-aggregate
5533 * completion handler correctly handles software retransmits.
5535 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5537 /* Update CLRDMASK just before this frame is queued */
5538 ath_tx_update_clrdmask(sc, tid, bf);
5540 /* Program descriptors + rate control */
5541 ath_tx_do_ratelookup(sc, bf);
5542 ath_tx_calc_duration(sc, bf);
5543 ath_tx_calc_protection(sc, bf);
5544 ath_tx_set_rtscts(sc, bf);
5545 ath_tx_rate_fill_rcflags(sc, bf);
5546 ath_tx_setds(sc, bf);
5549 * Update the current leak count if
5550 * we're leaking frames; and set the
5551 * MORE flag as appropriate.
5553 ath_tx_leak_count_update(sc, tid, bf);
5555 /* Track outstanding buffer count to hardware */
5556 /* aggregates are "one" buffer */
5559 /* Punt to hardware or software txq */
5560 ath_tx_handoff(sc, txq, bf);
5565 * Schedule some packets to the given hardware queue.
5567 * This function walks the list of TIDs (ie, ath_node TIDs
5568 * with queued traffic) and attempts to schedule traffic
5571 * TID scheduling is implemented as a FIFO, with TIDs being
5572 * added to the end of the queue after some frames have been
5576 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5578 struct ath_tid *tid, *next, *last;
5580 ATH_TX_LOCK_ASSERT(sc);
5583 * Don't schedule if the hardware queue is busy.
5584 * This (hopefully) gives some more time to aggregate
5585 * some packets in the aggregation queue.
5587 * XXX It doesn't stop a parallel sender from sneaking
5588 * in transmitting a frame!
5590 /* XXX TXQ locking */
5591 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5592 sc->sc_aggr_stats.aggr_sched_nopkt++;
5595 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5596 sc->sc_aggr_stats.aggr_sched_nopkt++;
5600 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5602 TAILQ_FOREACH_SAFE(tid, &txq->axq_tidq, axq_qelem, next) {
5604 * Suspend paused queues here; they'll be resumed
5605 * once the addba completes or times out.
5607 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5608 __func__, tid->tid, tid->paused);
5609 ath_tx_tid_unsched(sc, tid);
5611 * This node may be in power-save and we're leaking
5612 * a frame; be careful.
5614 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5617 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5618 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5620 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5622 /* Not empty? Re-schedule */
5623 if (tid->axq_depth != 0)
5624 ath_tx_tid_sched(sc, tid);
5627 * Give the software queue time to aggregate more
5628 * packets. If we aren't running aggregation then
5629 * we should still limit the hardware queue depth.
5631 /* XXX TXQ locking */
5632 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5635 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5640 * If this was the last entry on the original list, stop.
5641 * Otherwise nodes that have been rescheduled onto the end
5642 * of the TID FIFO list will just keep being rescheduled.
5644 * XXX What should we do about nodes that were paused
5645 * but are pending a leaking frame in response to a ps-poll?
5646 * They'll be put at the front of the list; so they'll
5647 * prematurely trigger this condition! Ew.
5659 * Return net80211 TID struct pointer, or NULL for none
5661 struct ieee80211_tx_ampdu *
5662 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5664 struct ieee80211_node *ni = &an->an_node;
5665 struct ieee80211_tx_ampdu *tap;
5667 if (tid == IEEE80211_NONQOS_TID)
5670 tap = &ni->ni_tx_ampdu[tid];
5675 * Is AMPDU-TX running?
5678 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5680 struct ieee80211_tx_ampdu *tap;
5682 if (tid == IEEE80211_NONQOS_TID)
5685 tap = ath_tx_get_tx_tid(an, tid);
5687 return 0; /* Not valid; default to not running */
5689 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5693 * Is AMPDU-TX negotiation pending?
5696 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5698 struct ieee80211_tx_ampdu *tap;
5700 if (tid == IEEE80211_NONQOS_TID)
5703 tap = ath_tx_get_tx_tid(an, tid);
5705 return 0; /* Not valid; default to not pending */
5707 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5711 * Is AMPDU-TX pending for the given TID?
5716 * Method to handle sending an ADDBA request.
5718 * We tap this so the relevant flags can be set to pause the TID
5719 * whilst waiting for the response.
5721 * XXX there's no timeout handler we can override?
5724 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5725 int dialogtoken, int baparamset, int batimeout)
5727 struct ath_softc *sc = ni->ni_ic->ic_softc;
5728 int tid = tap->txa_tid;
5729 struct ath_node *an = ATH_NODE(ni);
5730 struct ath_tid *atid = &an->an_tid[tid];
5733 * XXX danger Will Robinson!
5735 * Although the taskqueue may be running and scheduling some more
5736 * packets, these should all be _before_ the addba sequence number.
5737 * However, net80211 will keep self-assigning sequence numbers
5738 * until addba has been negotiated.
5740 * In the past, these packets would be "paused" (which still works
5741 * fine, as they're being scheduled to the driver in the same
5742 * serialised method which is calling the addba request routine)
5743 * and when the aggregation session begins, they'll be dequeued
5744 * as aggregate packets and added to the BAW. However, now there's
5745 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5746 * packets. Thus they never get included in the BAW tracking and
5747 * this can cause the initial burst of packets after the addba
5748 * negotiation to "hang", as they quickly fall outside the BAW.
5750 * The "eventual" solution should be to tag these packets with
5751 * dobaw. Although net80211 has given us a sequence number,
5752 * it'll be "after" the left edge of the BAW and thus it'll
5757 * This is a bit annoying. Until net80211 HT code inherits some
5758 * (any) locking, we may have this called in parallel BUT only
5759 * one response/timeout will be called. Grr.
5761 if (atid->addba_tx_pending == 0) {
5762 ath_tx_tid_pause(sc, atid);
5763 atid->addba_tx_pending = 1;
5767 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5768 "%s: %6D: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5772 dialogtoken, baparamset, batimeout);
5773 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5774 "%s: txa_start=%d, ni_txseqs=%d\n",
5775 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5777 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5782 * Handle an ADDBA response.
5784 * We unpause the queue so TX'ing can resume.
5786 * Any packets TX'ed from this point should be "aggregate" (whether
5787 * aggregate or not) so the BAW is updated.
5789 * Note! net80211 keeps self-assigning sequence numbers until
5790 * ampdu is negotiated. This means the initially-negotiated BAW left
5791 * edge won't match the ni->ni_txseq.
5793 * So, being very dirty, the BAW left edge is "slid" here to match
5796 * What likely SHOULD happen is that all packets subsequent to the
5797 * addba request should be tagged as aggregate and queued as non-aggregate
5798 * frames; thus updating the BAW. For now though, I'll just slide the
5802 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5803 int status, int code, int batimeout)
5805 struct ath_softc *sc = ni->ni_ic->ic_softc;
5806 int tid = tap->txa_tid;
5807 struct ath_node *an = ATH_NODE(ni);
5808 struct ath_tid *atid = &an->an_tid[tid];
5811 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5812 "%s: %6D: called; status=%d, code=%d, batimeout=%d\n", __func__,
5815 status, code, batimeout);
5817 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5818 "%s: txa_start=%d, ni_txseqs=%d\n",
5819 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5822 * Call this first, so the interface flags get updated
5823 * before the TID is unpaused. Otherwise a race condition
5824 * exists where the unpaused TID still doesn't yet have
5825 * IEEE80211_AGGR_RUNNING set.
5827 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5830 atid->addba_tx_pending = 0;
5833 * Slide the BAW left edge to wherever net80211 left it for us.
5834 * Read above for more information.
5836 tap->txa_start = ni->ni_txseqs[tid];
5837 ath_tx_tid_resume(sc, atid);
5844 * Stop ADDBA on a queue.
5846 * This can be called whilst BAR TX is currently active on the queue,
5847 * so make sure this is unblocked before continuing.
5850 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5852 struct ath_softc *sc = ni->ni_ic->ic_softc;
5853 int tid = tap->txa_tid;
5854 struct ath_node *an = ATH_NODE(ni);
5855 struct ath_tid *atid = &an->an_tid[tid];
5859 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %6D: called\n",
5865 * Pause TID traffic early, so there aren't any races
5866 * Unblock the pending BAR held traffic, if it's currently paused.
5869 ath_tx_tid_pause(sc, atid);
5870 if (atid->bar_wait) {
5872 * bar_unsuspend() expects bar_tx == 1, as it should be
5873 * called from the TX completion path. This quietens
5874 * the warning. It's cleared for us anyway.
5877 ath_tx_tid_bar_unsuspend(sc, atid);
5881 /* There's no need to hold the TXQ lock here */
5882 sc->sc_addba_stop(ni, tap);
5885 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
5886 * it'll set the cleanup flag, and it'll be unpaused once
5887 * things have been cleaned up.
5893 * In case there's a followup call to this, only call it
5894 * if we don't have a cleanup in progress.
5896 * Since we've paused the queue above, we need to make
5897 * sure we unpause if there's already a cleanup in
5898 * progress - it means something else is also doing
5899 * this stuff, so we don't need to also keep it paused.
5901 if (atid->cleanup_inprogress) {
5902 ath_tx_tid_resume(sc, atid);
5904 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
5906 * Unpause the TID if no cleanup is required.
5908 if (! atid->cleanup_inprogress)
5909 ath_tx_tid_resume(sc, atid);
5913 /* Handle completing frames and fail them */
5914 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5915 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5916 ath_tx_default_comp(sc, bf, 1);
5922 * Handle a node reassociation.
5924 * We may have a bunch of frames queued to the hardware; those need
5925 * to be marked as cleanup.
5928 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
5930 struct ath_tid *tid;
5937 ATH_TX_UNLOCK_ASSERT(sc);
5940 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
5941 tid = &an->an_tid[i];
5942 if (tid->hwq_depth == 0)
5944 DPRINTF(sc, ATH_DEBUG_NODE,
5945 "%s: %6D: TID %d: cleaning up TID\n",
5947 an->an_node.ni_macaddr,
5951 * In case there's a followup call to this, only call it
5952 * if we don't have a cleanup in progress.
5954 if (! tid->cleanup_inprogress) {
5955 ath_tx_tid_pause(sc, tid);
5956 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
5958 * Unpause the TID if no cleanup is required.
5960 if (! tid->cleanup_inprogress)
5961 ath_tx_tid_resume(sc, tid);
5966 /* Handle completing frames and fail them */
5967 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5968 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5969 ath_tx_default_comp(sc, bf, 1);
5974 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
5975 * it simply tears down the aggregation session. Ew.
5977 * It however will call ieee80211_ampdu_stop() which will call
5978 * ic->ic_addba_stop().
5980 * XXX This uses a hard-coded max BAR count value; the whole
5981 * XXX BAR TX success or failure should be better handled!
5984 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5987 struct ath_softc *sc = ni->ni_ic->ic_softc;
5988 int tid = tap->txa_tid;
5989 struct ath_node *an = ATH_NODE(ni);
5990 struct ath_tid *atid = &an->an_tid[tid];
5991 int attempts = tap->txa_attempts;
5994 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5995 "%s: %6D: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d, txa_start=%d, txa_seqpending=%d\n",
6004 tap->txa_seqpending);
6006 /* Note: This may update the BAW details */
6008 * XXX What if this does slide the BAW along? We need to somehow
6009 * XXX either fix things when it does happen, or prevent the
6010 * XXX seqpending value to be anything other than exactly what
6011 * XXX the hell we want!
6013 * XXX So for now, how I do this inside the TX lock for now
6014 * XXX and just correct it afterwards? The below condition should
6015 * XXX never happen and if it does I need to fix all kinds of things.
6018 old_txa_start = tap->txa_start;
6019 sc->sc_bar_response(ni, tap, status);
6020 if (tap->txa_start != old_txa_start) {
6021 device_printf(sc->sc_dev, "%s: tid=%d; txa_start=%d, old=%d, adjusting\n",
6027 tap->txa_start = old_txa_start;
6030 /* Unpause the TID */
6032 * XXX if this is attempt=50, the TID will be downgraded
6033 * XXX to a non-aggregate session. So we must unpause the
6034 * XXX TID here or it'll never be done.
6036 * Also, don't call it if bar_tx/bar_wait are 0; something
6037 * has beaten us to the punch? (XXX figure out what?)
6039 if (status == 0 || attempts == 50) {
6041 if (atid->bar_tx == 0 || atid->bar_wait == 0)
6042 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6043 "%s: huh? bar_tx=%d, bar_wait=%d\n",
6045 atid->bar_tx, atid->bar_wait);
6047 ath_tx_tid_bar_unsuspend(sc, atid);
6053 * This is called whenever the pending ADDBA request times out.
6054 * Unpause and reschedule the TID.
6057 ath_addba_response_timeout(struct ieee80211_node *ni,
6058 struct ieee80211_tx_ampdu *tap)
6060 struct ath_softc *sc = ni->ni_ic->ic_softc;
6061 int tid = tap->txa_tid;
6062 struct ath_node *an = ATH_NODE(ni);
6063 struct ath_tid *atid = &an->an_tid[tid];
6065 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
6066 "%s: %6D: TID=%d, called; resuming\n",
6073 atid->addba_tx_pending = 0;
6076 /* Note: This updates the aggregate state to (again) pending */
6077 sc->sc_addba_response_timeout(ni, tap);
6079 /* Unpause the TID; which reschedules it */
6081 ath_tx_tid_resume(sc, atid);
6086 * Check if a node is asleep or not.
6089 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
6092 ATH_TX_LOCK_ASSERT(sc);
6094 return (an->an_is_powersave);
6098 * Mark a node as currently "in powersaving."
6099 * This suspends all traffic on the node.
6101 * This must be called with the node/tx locks free.
6103 * XXX TODO: the locking silliness below is due to how the node
6104 * locking currently works. Right now, the node lock is grabbed
6105 * to do rate control lookups and these are done with the TX
6106 * queue lock held. This means the node lock can't be grabbed
6107 * first here or a LOR will occur.
6109 * Eventually (hopefully!) the TX path code will only grab
6110 * the TXQ lock when transmitting and the ath_node lock when
6111 * doing node/TID operations. There are other complications -
6112 * the sched/unsched operations involve walking the per-txq
6113 * 'active tid' list and this requires both locks to be held.
6116 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
6118 struct ath_tid *atid;
6119 struct ath_txq *txq;
6122 ATH_TX_UNLOCK_ASSERT(sc);
6124 /* Suspend all traffic on the node */
6127 if (an->an_is_powersave) {
6128 DPRINTF(sc, ATH_DEBUG_XMIT,
6129 "%s: %6D: node was already asleep!\n",
6130 __func__, an->an_node.ni_macaddr, ":");
6135 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6136 atid = &an->an_tid[tid];
6137 txq = sc->sc_ac2q[atid->ac];
6139 ath_tx_tid_pause(sc, atid);
6142 /* Mark node as in powersaving */
6143 an->an_is_powersave = 1;
6149 * Mark a node as currently "awake."
6150 * This resumes all traffic to the node.
6153 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
6155 struct ath_tid *atid;
6156 struct ath_txq *txq;
6159 ATH_TX_UNLOCK_ASSERT(sc);
6164 if (an->an_is_powersave == 0) {
6166 DPRINTF(sc, ATH_DEBUG_XMIT,
6167 "%s: an=%p: node was already awake\n",
6172 /* Mark node as awake */
6173 an->an_is_powersave = 0;
6175 * Clear any pending leaked frame requests
6177 an->an_leak_count = 0;
6179 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6180 atid = &an->an_tid[tid];
6181 txq = sc->sc_ac2q[atid->ac];
6183 ath_tx_tid_resume(sc, atid);
6189 ath_legacy_dma_txsetup(struct ath_softc *sc)
6192 /* nothing new needed */
6197 ath_legacy_dma_txteardown(struct ath_softc *sc)
6200 /* nothing new needed */
6205 ath_xmit_setup_legacy(struct ath_softc *sc)
6208 * For now, just set the descriptor length to sizeof(ath_desc);
6209 * worry about extracting the real length out of the HAL later.
6211 sc->sc_tx_desclen = sizeof(struct ath_desc);
6212 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6213 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6215 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6216 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6217 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6219 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6220 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6222 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;