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
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31 #include <sys/cdefs.h>
34 * Driver for the Atheros Wireless LAN controller.
36 * This software is derived from work of Atsushi Onoe; his contribution
37 * is greatly appreciated.
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/sysctl.h>
48 #include <sys/malloc.h>
50 #include <sys/mutex.h>
51 #include <sys/kernel.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/errno.h>
55 #include <sys/callout.h>
57 #include <sys/endian.h>
58 #include <sys/kthread.h>
59 #include <sys/taskqueue.h>
64 #include <net/if_var.h>
65 #include <net/if_dl.h>
66 #include <net/if_media.h>
67 #include <net/if_types.h>
68 #include <net/if_arp.h>
69 #include <net/ethernet.h>
70 #include <net/if_llc.h>
72 #include <netproto/802_11/ieee80211_var.h>
73 #include <netproto/802_11/ieee80211_regdomain.h>
74 #ifdef IEEE80211_SUPPORT_SUPERG
75 #include <netproto/802_11/ieee80211_superg.h>
77 #ifdef IEEE80211_SUPPORT_TDMA
78 #include <netproto/802_11/ieee80211_tdma.h>
80 #include <netproto/802_11/ieee80211_ht.h>
85 #include <netinet/in.h>
86 #include <netinet/if_ether.h>
89 #include <dev/netif/ath/ath/if_athvar.h>
90 #include <dev/netif/ath/ath_hal/ah_devid.h> /* XXX for softled */
91 #include <dev/netif/ath/ath_hal/ah_diagcodes.h>
93 #include <dev/netif/ath/ath/if_ath_debug.h>
96 #include <dev/netif/ath/ath_tx99/ath_tx99.h>
99 #include <dev/netif/ath/ath/if_ath_misc.h>
100 #include <dev/netif/ath/ath/if_ath_tx.h>
101 #include <dev/netif/ath/ath/if_ath_tx_ht.h>
104 #include <dev/netif/ath/ath/if_ath_alq.h>
107 extern const char* ath_hal_ether_sprintf(const uint8_t *mac);
110 * How many retries to perform in software
112 #define SWMAX_RETRIES 10
115 * What queue to throw the non-QoS TID traffic into
117 #define ATH_NONQOS_TID_AC WME_AC_VO
120 static int ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an);
122 static int ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an,
124 static int ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an,
126 static ieee80211_seq ath_tx_tid_seqno_assign(struct ath_softc *sc,
127 struct ieee80211_node *ni, struct ath_buf *bf, struct mbuf *m0);
128 static int ath_tx_action_frame_override_queue(struct ath_softc *sc,
129 struct ieee80211_node *ni, struct mbuf *m0, int *tid);
130 static struct ath_buf *
131 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
132 struct ath_tid *tid, struct ath_buf *bf);
136 ath_tx_alq_post(struct ath_softc *sc, struct ath_buf *bf_first)
142 /* XXX we should skip out early if debugging isn't enabled! */
146 /* XXX should ensure bf_nseg > 0! */
147 if (bf->bf_nseg == 0)
149 n = ((bf->bf_nseg - 1) / sc->sc_tx_nmaps) + 1;
150 for (i = 0, ds = (const char *) bf->bf_desc;
152 i++, ds += sc->sc_tx_desclen) {
153 if_ath_alq_post(&sc->sc_alq,
161 #endif /* ATH_DEBUG_ALQ */
164 * Whether to use the 11n rate scenario functions or not
167 ath_tx_is_11n(struct ath_softc *sc)
169 return ((sc->sc_ah->ah_magic == 0x20065416) ||
170 (sc->sc_ah->ah_magic == 0x19741014));
174 * Obtain the current TID from the given frame.
176 * Non-QoS frames need to go into TID 16 (IEEE80211_NONQOS_TID.)
177 * This has implications for which AC/priority the packet is placed
181 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
183 const struct ieee80211_frame *wh;
184 int pri = M_WME_GETAC(m0);
186 wh = mtod(m0, const struct ieee80211_frame *);
187 if (! IEEE80211_QOS_HAS_SEQ(wh))
188 return IEEE80211_NONQOS_TID;
190 return WME_AC_TO_TID(pri);
194 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
196 struct ieee80211_frame *wh;
198 wh = mtod(bf->bf_m, struct ieee80211_frame *);
199 /* Only update/resync if needed */
200 if (bf->bf_state.bfs_isretried == 0) {
201 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
202 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
203 BUS_DMASYNC_PREWRITE);
205 bf->bf_state.bfs_isretried = 1;
206 bf->bf_state.bfs_retries ++;
210 * Determine what the correct AC queue for the given frame
213 * This code assumes that the TIDs map consistently to
214 * the underlying hardware (or software) ath_txq.
215 * Since the sender may try to set an AC which is
216 * arbitrary, non-QoS TIDs may end up being put on
217 * completely different ACs. There's no way to put a
218 * TID into multiple ath_txq's for scheduling, so
219 * for now we override the AC/TXQ selection and set
220 * non-QOS TID frames into the BE queue.
222 * This may be completely incorrect - specifically,
223 * some management frames may end up out of order
224 * compared to the QoS traffic they're controlling.
225 * I'll look into this later.
228 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
230 const struct ieee80211_frame *wh;
231 int pri = M_WME_GETAC(m0);
232 wh = mtod(m0, const struct ieee80211_frame *);
233 if (IEEE80211_QOS_HAS_SEQ(wh))
236 return ATH_NONQOS_TID_AC;
240 ath_txfrag_cleanup(struct ath_softc *sc,
241 ath_bufhead *frags, struct ieee80211_node *ni)
244 struct ath_buf *next;
246 ATH_TXBUF_LOCK_ASSERT(sc);
248 next = TAILQ_FIRST(frags);
249 while ((bf = next) != NULL) {
250 next = TAILQ_NEXT(bf, bf_list);
251 /* NB: bf assumed clean */
252 TAILQ_REMOVE(frags, bf, bf_list);
253 ath_returnbuf_head(sc, bf);
254 ieee80211_node_decref(ni);
259 * Setup xmit of a fragmented frame. Allocate a buffer
260 * for each frag and bump the node reference count to
261 * reflect the held reference to be setup by ath_tx_start.
264 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
265 struct mbuf *m0, struct ieee80211_node *ni)
271 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
272 /* XXX non-management? */
273 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
274 if (bf == NULL) { /* out of buffers, cleanup */
275 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
277 ath_txfrag_cleanup(sc, frags, ni);
280 ieee80211_node_incref(ni);
281 TAILQ_INSERT_TAIL(frags, bf, bf_list);
283 ATH_TXBUF_UNLOCK(sc);
285 return !TAILQ_EMPTY(frags);
289 * Reclaim mbuf resources. For fragmented frames we
290 * need to claim each frag chained with m_nextpkt.
293 ath_freetx(struct mbuf *m)
301 } while ((m = next) != NULL);
305 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
310 * Load the DMA map so any coalescing is done. This
311 * also calculates the number of descriptors we need.
313 error = bus_dmamap_load_mbuf_defrag(sc->sc_dmat, bf->bf_dmamap, &m0,
314 bf->bf_segs, ATH_TXDESC, &bf->bf_nseg,
317 sc->sc_stats.ast_tx_busdma++;
323 * Discard null packets.
325 if (bf->bf_nseg == 0) {
326 sc->sc_stats.ast_tx_nodata++;
330 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
331 __func__, m0, m0->m_pkthdr.len);
332 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
339 * Chain together segments+descriptors for a frame - 11n or otherwise.
341 * For aggregates, this is called on each frame in the aggregate.
344 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
345 struct ath_buf *bf, int is_aggr, int is_first_subframe,
346 int is_last_subframe)
348 struct ath_hal *ah = sc->sc_ah;
351 HAL_DMA_ADDR bufAddrList[4];
352 uint32_t segLenList[4];
357 * XXX There's txdma and txdma_mgmt; the descriptor
360 struct ath_descdma *dd = &sc->sc_txdma;
363 * Fillin the remainder of the descriptor info.
367 * We need the number of TX data pointers in each descriptor.
368 * EDMA and later chips support 4 TX buffers per descriptor;
369 * previous chips just support one.
371 numTxMaps = sc->sc_tx_nmaps;
374 * For EDMA and later chips ensure the TX map is fully populated
375 * before advancing to the next descriptor.
377 ds = (char *) bf->bf_desc;
379 bzero(bufAddrList, sizeof(bufAddrList));
380 bzero(segLenList, sizeof(segLenList));
381 for (i = 0; i < bf->bf_nseg; i++) {
382 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
383 segLenList[bp] = bf->bf_segs[i].ds_len;
387 * Go to the next segment if this isn't the last segment
388 * and there's space in the current TX map.
390 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
394 * Last segment or we're out of buffer pointers.
398 if (i == bf->bf_nseg - 1)
399 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
401 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
402 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
405 * XXX This assumes that bfs_txq is the actual destination
406 * hardware queue at this point. It may not have been
407 * assigned, it may actually be pointing to the multicast
408 * software TXQ id. These must be fixed!
410 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
413 , bf->bf_descid /* XXX desc id */
414 , bf->bf_state.bfs_tx_queue
415 , isFirstDesc /* first segment */
416 , i == bf->bf_nseg - 1 /* last segment */
417 , (struct ath_desc *) ds0 /* first descriptor */
421 * Make sure the 11n aggregate fields are cleared.
423 * XXX TODO: this doesn't need to be called for
424 * aggregate frames; as it'll be called on all
425 * sub-frames. Since the descriptors are in
426 * non-cacheable memory, this leads to some
427 * rather slow writes on MIPS/ARM platforms.
429 if (ath_tx_is_11n(sc))
430 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
433 * If 11n is enabled, set it up as if it's an aggregate
436 if (is_last_subframe) {
437 ath_hal_set11n_aggr_last(sc->sc_ah,
438 (struct ath_desc *) ds);
439 } else if (is_aggr) {
441 * This clears the aggrlen field; so
442 * the caller needs to call set_aggr_first()!
444 * XXX TODO: don't call this for the first
445 * descriptor in the first frame in an
448 ath_hal_set11n_aggr_middle(sc->sc_ah,
449 (struct ath_desc *) ds,
450 bf->bf_state.bfs_ndelim);
453 bf->bf_lastds = (struct ath_desc *) ds;
456 * Don't forget to skip to the next descriptor.
458 ds += sc->sc_tx_desclen;
462 * .. and don't forget to blank these out!
464 bzero(bufAddrList, sizeof(bufAddrList));
465 bzero(segLenList, sizeof(segLenList));
467 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
471 * Set the rate control fields in the given descriptor based on
472 * the bf_state fields and node state.
474 * The bfs fields should already be set with the relevant rate
475 * control information, including whether MRR is to be enabled.
477 * Since the FreeBSD HAL currently sets up the first TX rate
478 * in ath_hal_setuptxdesc(), this will setup the MRR
479 * conditionally for the pre-11n chips, and call ath_buf_set_rate
480 * unconditionally for 11n chips. These require the 11n rate
481 * scenario to be set if MCS rates are enabled, so it's easier
482 * to just always call it. The caller can then only set rates 2, 3
483 * and 4 if multi-rate retry is needed.
486 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
489 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
491 /* If mrr is disabled, blank tries 1, 2, 3 */
492 if (! bf->bf_state.bfs_ismrr)
493 rc[1].tries = rc[2].tries = rc[3].tries = 0;
497 * If NOACK is set, just set ntries=1.
499 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
500 rc[1].tries = rc[2].tries = rc[3].tries = 0;
506 * Always call - that way a retried descriptor will
507 * have the MRR fields overwritten.
509 * XXX TODO: see if this is really needed - setting up
510 * the first descriptor should set the MRR fields to 0
513 if (ath_tx_is_11n(sc)) {
514 ath_buf_set_rate(sc, ni, bf);
516 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
517 , rc[1].ratecode, rc[1].tries
518 , rc[2].ratecode, rc[2].tries
519 , rc[3].ratecode, rc[3].tries
525 * Setup segments+descriptors for an 11n aggregate.
526 * bf_first is the first buffer in the aggregate.
527 * The descriptor list must already been linked together using
531 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
533 struct ath_buf *bf, *bf_prev = NULL;
534 struct ath_desc *ds0 = bf_first->bf_desc;
536 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
537 __func__, bf_first->bf_state.bfs_nframes,
538 bf_first->bf_state.bfs_al);
542 if (bf->bf_state.bfs_txrate0 == 0)
543 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
545 if (bf->bf_state.bfs_rc[0].ratecode == 0)
546 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
550 * Setup all descriptors of all subframes - this will
551 * call ath_hal_set11naggrmiddle() on every frame.
554 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
555 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
556 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
557 SEQNO(bf->bf_state.bfs_seqno));
560 * Setup the initial fields for the first descriptor - all
561 * the non-11n specific stuff.
563 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
564 , bf->bf_state.bfs_pktlen /* packet length */
565 , bf->bf_state.bfs_hdrlen /* header length */
566 , bf->bf_state.bfs_atype /* Atheros packet type */
567 , bf->bf_state.bfs_txpower /* txpower */
568 , bf->bf_state.bfs_txrate0
569 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
570 , bf->bf_state.bfs_keyix /* key cache index */
571 , bf->bf_state.bfs_txantenna /* antenna mode */
572 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
573 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
574 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
578 * First descriptor? Setup the rate control and initial
579 * aggregate header information.
581 if (bf == bf_first) {
583 * setup first desc with rate and aggr info
585 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
589 * Setup the descriptors for a multi-descriptor frame.
590 * This is both aggregate and non-aggregate aware.
592 ath_tx_chaindesclist(sc, ds0, bf,
594 !! (bf == bf_first), /* is_first_subframe */
595 !! (bf->bf_next == NULL) /* is_last_subframe */
598 if (bf == bf_first) {
600 * Initialise the first 11n aggregate with the
601 * aggregate length and aggregate enable bits.
603 ath_hal_set11n_aggr_first(sc->sc_ah,
606 bf->bf_state.bfs_ndelim);
610 * Link the last descriptor of the previous frame
611 * to the beginning descriptor of this frame.
614 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
617 /* Save a copy so we can link the next descriptor in */
623 * Set the first descriptor bf_lastds field to point to
624 * the last descriptor in the last subframe, that's where
625 * the status update will occur.
627 bf_first->bf_lastds = bf_prev->bf_lastds;
630 * And bf_last in the first descriptor points to the end of
631 * the aggregate list.
633 bf_first->bf_last = bf_prev;
636 * For non-AR9300 NICs, which require the rate control
637 * in the final descriptor - let's set that up now.
639 * This is because the filltxdesc() HAL call doesn't
640 * populate the last segment with rate control information
641 * if firstSeg is also true. For non-aggregate frames
642 * that is fine, as the first frame already has rate control
643 * info. But if the last frame in an aggregate has one
644 * descriptor, both firstseg and lastseg will be true and
645 * the rate info isn't copied.
647 * This is inefficient on MIPS/ARM platforms that have
648 * non-cachable memory for TX descriptors, but we'll just
651 * As to why the rate table is stashed in the last descriptor
652 * rather than the first descriptor? Because proctxdesc()
653 * is called on the final descriptor in an MPDU or A-MPDU -
654 * ie, the one that gets updated by the hardware upon
655 * completion. That way proctxdesc() doesn't need to know
656 * about the first _and_ last TX descriptor.
658 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
660 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
664 * Hand-off a frame to the multicast TX queue.
666 * This is a software TXQ which will be appended to the CAB queue
667 * during the beacon setup code.
669 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
670 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
671 * with the actual hardware txq, or all of this will fall apart.
673 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
674 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
678 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
681 ATH_TX_LOCK_ASSERT(sc);
683 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
684 ("%s: busy status 0x%x", __func__, bf->bf_flags));
687 * Ensure that the tx queue is the cabq, so things get
690 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
691 DPRINTF(sc, ATH_DEBUG_XMIT,
692 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
693 __func__, bf, bf->bf_state.bfs_tx_queue,
698 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
699 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
700 struct ieee80211_frame *wh;
702 /* mark previous frame */
703 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
704 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
705 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
706 BUS_DMASYNC_PREWRITE);
708 /* link descriptor */
709 ath_hal_settxdesclink(sc->sc_ah,
713 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
718 * Hand-off packet to a hardware queue.
721 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
724 struct ath_hal *ah = sc->sc_ah;
725 struct ath_buf *bf_first;
728 * Insert the frame on the outbound list and pass it on
729 * to the hardware. Multicast frames buffered for power
730 * save stations and transmit from the CAB queue are stored
731 * on a s/w only queue and loaded on to the CAB queue in
732 * the SWBA handler since frames only go out on DTIM and
733 * to avoid possible races.
735 ATH_TX_LOCK_ASSERT(sc);
736 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
737 ("%s: busy status 0x%x", __func__, bf->bf_flags));
738 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
739 ("ath_tx_handoff_hw called for mcast queue"));
742 * XXX racy, should hold the PCU lock when checking this,
743 * and also should ensure that the TX counter is >0!
745 KASSERT((sc->sc_inreset_cnt == 0),
746 ("%s: TX during reset?\n", __func__));
750 * This causes a LOR. Find out where the PCU lock is being
751 * held whilst the TXQ lock is grabbed - that shouldn't
755 if (sc->sc_inreset_cnt) {
757 DPRINTF(sc, ATH_DEBUG_RESET,
758 "%s: called with sc_in_reset != 0\n",
760 DPRINTF(sc, ATH_DEBUG_XMIT,
761 "%s: queued: TXDP[%u] = %p (%p) depth %d\n",
762 __func__, txq->axq_qnum,
763 (caddr_t)bf->bf_daddr, bf->bf_desc,
765 /* XXX axq_link needs to be set and updated! */
766 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
767 if (bf->bf_state.bfs_aggr)
768 txq->axq_aggr_depth++;
777 * XXX TODO: if there's a holdingbf, then
778 * ATH_TXQ_PUTRUNNING should be clear.
780 * If there is a holdingbf and the list is empty,
781 * then axq_link should be pointing to the holdingbf.
783 * Otherwise it should point to the last descriptor
784 * in the last ath_buf.
786 * In any case, we should really ensure that we
787 * update the previous descriptor link pointer to
788 * this descriptor, regardless of all of the above state.
790 * For now this is captured by having axq_link point
791 * to either the holdingbf (if the TXQ list is empty)
792 * or the end of the list (if the TXQ list isn't empty.)
793 * I'd rather just kill axq_link here and do it as above.
797 * Append the frame to the TX queue.
799 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
800 ATH_KTR(sc, ATH_KTR_TX, 3,
801 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
808 * If there's a link pointer, update it.
810 * XXX we should replace this with the above logic, just
811 * to kill axq_link with fire.
813 if (txq->axq_link != NULL) {
814 *txq->axq_link = bf->bf_daddr;
815 DPRINTF(sc, ATH_DEBUG_XMIT,
816 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
817 txq->axq_qnum, txq->axq_link,
818 (caddr_t)bf->bf_daddr, bf->bf_desc,
820 ATH_KTR(sc, ATH_KTR_TX, 5,
821 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
823 txq->axq_qnum, txq->axq_link,
824 (caddr_t)bf->bf_daddr, bf->bf_desc,
829 * If we've not pushed anything into the hardware yet,
830 * push the head of the queue into the TxDP.
832 * Once we've started DMA, there's no guarantee that
833 * updating the TxDP with a new value will actually work.
834 * So we just don't do that - if we hit the end of the list,
835 * we keep that buffer around (the "holding buffer") and
836 * re-start DMA by updating the link pointer of _that_
837 * descriptor and then restart DMA.
839 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
840 bf_first = TAILQ_FIRST(&txq->axq_q);
841 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
842 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
843 DPRINTF(sc, ATH_DEBUG_XMIT,
844 "%s: TXDP[%u] = %p (%p) depth %d\n",
845 __func__, txq->axq_qnum,
846 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
848 ATH_KTR(sc, ATH_KTR_TX, 5,
849 "ath_tx_handoff: TXDP[%u] = %p (%p) "
850 "lastds=%p depth %d",
852 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
858 * Ensure that the bf TXQ matches this TXQ, so later
859 * checking and holding buffer manipulation is sane.
861 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
862 DPRINTF(sc, ATH_DEBUG_XMIT,
863 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
864 __func__, bf, bf->bf_state.bfs_tx_queue,
869 * Track aggregate queue depth.
871 if (bf->bf_state.bfs_aggr)
872 txq->axq_aggr_depth++;
875 * Update the link pointer.
877 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
882 * If we wrote a TxDP above, DMA will start from here.
884 * If DMA is running, it'll do nothing.
886 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
887 * or VEOL) then it stops at the last transmitted write.
888 * We then append a new frame by updating the link pointer
889 * in that descriptor and then kick TxE here; it will re-read
890 * that last descriptor and find the new descriptor to transmit.
892 * This is why we keep the holding descriptor around.
894 ath_hal_txstart(ah, txq->axq_qnum);
896 ATH_KTR(sc, ATH_KTR_TX, 1,
897 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
901 * Restart TX DMA for the given TXQ.
903 * This must be called whether the queue is empty or not.
906 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
908 struct ath_buf *bf, *bf_last;
910 ATH_TXQ_LOCK_ASSERT(txq);
912 /* XXX make this ATH_TXQ_FIRST */
913 bf = TAILQ_FIRST(&txq->axq_q);
914 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
919 DPRINTF(sc, ATH_DEBUG_RESET,
920 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
925 (uint32_t) bf->bf_daddr);
928 if (sc->sc_debug & ATH_DEBUG_RESET)
929 ath_tx_dump(sc, txq);
933 * This is called from a restart, so DMA is known to be
934 * completely stopped.
936 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
937 ("%s: Q%d: called with PUTRUNNING=1\n",
941 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
942 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
944 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
946 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
950 * Hand off a packet to the hardware (or mcast queue.)
952 * The relevant hardware txq should be locked.
955 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
958 ATH_TX_LOCK_ASSERT(sc);
961 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
962 ath_tx_alq_post(sc, bf);
965 if (txq->axq_qnum == ATH_TXQ_SWQ)
966 ath_tx_handoff_mcast(sc, txq, bf);
968 ath_tx_handoff_hw(sc, txq, bf);
972 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
973 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
976 DPRINTF(sc, ATH_DEBUG_XMIT,
977 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
986 const struct ieee80211_cipher *cip;
987 struct ieee80211_key *k;
990 * Construct the 802.11 header+trailer for an encrypted
991 * frame. The only reason this can fail is because of an
992 * unknown or unsupported cipher/key type.
994 k = ieee80211_crypto_encap(ni, m0);
997 * This can happen when the key is yanked after the
998 * frame was queued. Just discard the frame; the
999 * 802.11 layer counts failures and provides
1000 * debugging/diagnostics.
1005 * Adjust the packet + header lengths for the crypto
1006 * additions and calculate the h/w key index. When
1007 * a s/w mic is done the frame will have had any mic
1008 * added to it prior to entry so m0->m_pkthdr.len will
1009 * account for it. Otherwise we need to add it to the
1013 (*hdrlen) += cip->ic_header;
1014 (*pktlen) += cip->ic_header + cip->ic_trailer;
1015 /* NB: frags always have any TKIP MIC done in s/w */
1016 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1017 (*pktlen) += cip->ic_miclen;
1018 (*keyix) = k->wk_keyix;
1019 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1021 * Use station key cache slot, if assigned.
1023 (*keyix) = ni->ni_ucastkey.wk_keyix;
1024 if ((*keyix) == IEEE80211_KEYIX_NONE)
1025 (*keyix) = HAL_TXKEYIX_INVALID;
1027 (*keyix) = HAL_TXKEYIX_INVALID;
1033 * Calculate whether interoperability protection is required for
1036 * This requires the rate control information be filled in,
1037 * as the protection requirement depends upon the current
1038 * operating mode / PHY.
1041 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1043 struct ieee80211_frame *wh;
1047 const HAL_RATE_TABLE *rt = sc->sc_currates;
1048 struct ifnet *ifp = sc->sc_ifp;
1049 struct ieee80211com *ic = ifp->if_l2com;
1051 flags = bf->bf_state.bfs_txflags;
1052 rix = bf->bf_state.bfs_rc[0].rix;
1053 shortPreamble = bf->bf_state.bfs_shpream;
1054 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1057 * If 802.11g protection is enabled, determine whether
1058 * to use RTS/CTS or just CTS. Note that this is only
1059 * done for OFDM unicast frames.
1061 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1062 rt->info[rix].phy == IEEE80211_T_OFDM &&
1063 (flags & HAL_TXDESC_NOACK) == 0) {
1064 bf->bf_state.bfs_doprot = 1;
1065 /* XXX fragments must use CCK rates w/ protection */
1066 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1067 flags |= HAL_TXDESC_RTSENA;
1068 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1069 flags |= HAL_TXDESC_CTSENA;
1072 * For frags it would be desirable to use the
1073 * highest CCK rate for RTS/CTS. But stations
1074 * farther away may detect it at a lower CCK rate
1075 * so use the configured protection rate instead
1078 sc->sc_stats.ast_tx_protect++;
1082 * If 11n protection is enabled and it's a HT frame,
1085 * XXX ic_htprotmode or ic_curhtprotmode?
1086 * XXX should it_htprotmode only matter if ic_curhtprotmode
1087 * XXX indicates it's not a HT pure environment?
1089 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1090 rt->info[rix].phy == IEEE80211_T_HT &&
1091 (flags & HAL_TXDESC_NOACK) == 0) {
1092 flags |= HAL_TXDESC_RTSENA;
1093 sc->sc_stats.ast_tx_htprotect++;
1095 bf->bf_state.bfs_txflags = flags;
1099 * Update the frame duration given the currently selected rate.
1101 * This also updates the frame duration value, so it will require
1105 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1107 struct ieee80211_frame *wh;
1111 struct ath_hal *ah = sc->sc_ah;
1112 const HAL_RATE_TABLE *rt = sc->sc_currates;
1113 int isfrag = bf->bf_m->m_flags & M_FRAG;
1115 flags = bf->bf_state.bfs_txflags;
1116 rix = bf->bf_state.bfs_rc[0].rix;
1117 shortPreamble = bf->bf_state.bfs_shpream;
1118 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1121 * Calculate duration. This logically belongs in the 802.11
1122 * layer but it lacks sufficient information to calculate it.
1124 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1125 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1128 dur = rt->info[rix].spAckDuration;
1130 dur = rt->info[rix].lpAckDuration;
1131 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1132 dur += dur; /* additional SIFS+ACK */
1134 * Include the size of next fragment so NAV is
1135 * updated properly. The last fragment uses only
1138 * XXX TODO: ensure that the rate lookup for each
1139 * fragment is the same as the rate used by the
1142 dur += ath_hal_computetxtime(ah,
1145 rix, shortPreamble);
1149 * Force hardware to use computed duration for next
1150 * fragment by disabling multi-rate retry which updates
1151 * duration based on the multi-rate duration table.
1153 bf->bf_state.bfs_ismrr = 0;
1154 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1155 /* XXX update bfs_rc[0].try? */
1158 /* Update the duration field itself */
1159 *(u_int16_t *)wh->i_dur = htole16(dur);
1164 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1165 int cix, int shortPreamble)
1170 * CTS transmit rate is derived from the transmit rate
1171 * by looking in the h/w rate table. We must also factor
1172 * in whether or not a short preamble is to be used.
1174 /* NB: cix is set above where RTS/CTS is enabled */
1175 KASSERT(cix != 0xff, ("cix not setup"));
1176 ctsrate = rt->info[cix].rateCode;
1178 /* XXX this should only matter for legacy rates */
1180 ctsrate |= rt->info[cix].shortPreamble;
1186 * Calculate the RTS/CTS duration for legacy frames.
1189 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1190 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1193 int ctsduration = 0;
1195 /* This mustn't be called for HT modes */
1196 if (rt->info[cix].phy == IEEE80211_T_HT) {
1197 kprintf("%s: HT rate where it shouldn't be (0x%x)\n",
1198 __func__, rt->info[cix].rateCode);
1203 * Compute the transmit duration based on the frame
1204 * size and the size of an ACK frame. We call into the
1205 * HAL to do the computation since it depends on the
1206 * characteristics of the actual PHY being used.
1208 * NB: CTS is assumed the same size as an ACK so we can
1209 * use the precalculated ACK durations.
1211 if (shortPreamble) {
1212 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1213 ctsduration += rt->info[cix].spAckDuration;
1214 ctsduration += ath_hal_computetxtime(ah,
1215 rt, pktlen, rix, AH_TRUE);
1216 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1217 ctsduration += rt->info[rix].spAckDuration;
1219 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1220 ctsduration += rt->info[cix].lpAckDuration;
1221 ctsduration += ath_hal_computetxtime(ah,
1222 rt, pktlen, rix, AH_FALSE);
1223 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1224 ctsduration += rt->info[rix].lpAckDuration;
1227 return (ctsduration);
1231 * Update the given ath_buf with updated rts/cts setup and duration
1234 * To support rate lookups for each software retry, the rts/cts rate
1235 * and cts duration must be re-calculated.
1237 * This function assumes the RTS/CTS flags have been set as needed;
1238 * mrr has been disabled; and the rate control lookup has been done.
1240 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1241 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1244 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1246 uint16_t ctsduration = 0;
1247 uint8_t ctsrate = 0;
1248 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1250 const HAL_RATE_TABLE *rt = sc->sc_currates;
1253 * No RTS/CTS enabled? Don't bother.
1255 if ((bf->bf_state.bfs_txflags &
1256 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1257 /* XXX is this really needed? */
1258 bf->bf_state.bfs_ctsrate = 0;
1259 bf->bf_state.bfs_ctsduration = 0;
1264 * If protection is enabled, use the protection rix control
1265 * rate. Otherwise use the rate0 control rate.
1267 if (bf->bf_state.bfs_doprot)
1268 rix = sc->sc_protrix;
1270 rix = bf->bf_state.bfs_rc[0].rix;
1273 * If the raw path has hard-coded ctsrate0 to something,
1276 if (bf->bf_state.bfs_ctsrate0 != 0)
1277 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1279 /* Control rate from above */
1280 cix = rt->info[rix].controlRate;
1282 /* Calculate the rtscts rate for the given cix */
1283 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1284 bf->bf_state.bfs_shpream);
1286 /* The 11n chipsets do ctsduration calculations for you */
1287 if (! ath_tx_is_11n(sc))
1288 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1289 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1290 rt, bf->bf_state.bfs_txflags);
1292 /* Squirrel away in ath_buf */
1293 bf->bf_state.bfs_ctsrate = ctsrate;
1294 bf->bf_state.bfs_ctsduration = ctsduration;
1297 * Must disable multi-rate retry when using RTS/CTS.
1299 if (!sc->sc_mrrprot) {
1300 bf->bf_state.bfs_ismrr = 0;
1301 bf->bf_state.bfs_try0 =
1302 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1307 * Setup the descriptor chain for a normal or fast-frame
1310 * XXX TODO: extend to include the destination hardware QCU ID.
1311 * Make sure that is correct. Make sure that when being added
1312 * to the mcastq, the CABQ QCUID is set or things will get a bit
1316 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1318 struct ath_desc *ds = bf->bf_desc;
1319 struct ath_hal *ah = sc->sc_ah;
1321 if (bf->bf_state.bfs_txrate0 == 0)
1322 DPRINTF(sc, ATH_DEBUG_XMIT,
1323 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1325 ath_hal_setuptxdesc(ah, ds
1326 , bf->bf_state.bfs_pktlen /* packet length */
1327 , bf->bf_state.bfs_hdrlen /* header length */
1328 , bf->bf_state.bfs_atype /* Atheros packet type */
1329 , bf->bf_state.bfs_txpower /* txpower */
1330 , bf->bf_state.bfs_txrate0
1331 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1332 , bf->bf_state.bfs_keyix /* key cache index */
1333 , bf->bf_state.bfs_txantenna /* antenna mode */
1334 , bf->bf_state.bfs_txflags /* flags */
1335 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1336 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1340 * This will be overriden when the descriptor chain is written.
1345 /* Set rate control and descriptor chain for this frame */
1346 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1347 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1353 * This performs a rate lookup for the given ath_buf only if it's required.
1354 * Non-data frames and raw frames don't require it.
1356 * This populates the primary and MRR entries; MRR values are
1357 * then disabled later on if something requires it (eg RTS/CTS on
1360 * This needs to be done before the RTS/CTS fields are calculated
1361 * as they may depend upon the rate chosen.
1364 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1369 if (! bf->bf_state.bfs_doratelookup)
1372 /* Get rid of any previous state */
1373 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1375 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1376 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1377 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1379 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1380 bf->bf_state.bfs_rc[0].rix = rix;
1381 bf->bf_state.bfs_rc[0].ratecode = rate;
1382 bf->bf_state.bfs_rc[0].tries = try0;
1384 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1385 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1386 bf->bf_state.bfs_rc);
1387 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1389 sc->sc_txrix = rix; /* for LED blinking */
1390 sc->sc_lastdatarix = rix; /* for fast frames */
1391 bf->bf_state.bfs_try0 = try0;
1392 bf->bf_state.bfs_txrate0 = rate;
1396 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1399 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1402 struct ath_node *an = ATH_NODE(bf->bf_node);
1404 ATH_TX_LOCK_ASSERT(sc);
1406 if (an->clrdmask == 1) {
1407 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1413 * Return whether this frame should be software queued or
1414 * direct dispatched.
1416 * When doing powersave, BAR frames should be queued but other management
1417 * frames should be directly sent.
1419 * When not doing powersave, stick BAR frames into the hardware queue
1420 * so it goes out even though the queue is paused.
1422 * For now, management frames are also software queued by default.
1425 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1426 struct mbuf *m0, int *queue_to_head)
1428 struct ieee80211_node *ni = &an->an_node;
1429 struct ieee80211_frame *wh;
1430 uint8_t type, subtype;
1432 wh = mtod(m0, struct ieee80211_frame *);
1433 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1434 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1436 (*queue_to_head) = 0;
1438 /* If it's not in powersave - direct-dispatch BAR */
1439 if ((ATH_NODE(ni)->an_is_powersave == 0)
1440 && type == IEEE80211_FC0_TYPE_CTL &&
1441 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1442 DPRINTF(sc, ATH_DEBUG_SW_TX,
1443 "%s: BAR: TX'ing direct\n", __func__);
1445 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1446 && type == IEEE80211_FC0_TYPE_CTL &&
1447 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1448 /* BAR TX whilst asleep; queue */
1449 DPRINTF(sc, ATH_DEBUG_SW_TX,
1450 "%s: swq: TX'ing\n", __func__);
1451 (*queue_to_head) = 1;
1453 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1454 && (type == IEEE80211_FC0_TYPE_MGT ||
1455 type == IEEE80211_FC0_TYPE_CTL)) {
1457 * Other control/mgmt frame; bypass software queuing
1460 DPRINTF(sc, ATH_DEBUG_XMIT,
1461 "%s: %s: Node is asleep; sending mgmt "
1462 "(type=%d, subtype=%d)\n",
1463 __func__, ath_hal_ether_sprintf(ni->ni_macaddr),
1473 * Transmit the given frame to the hardware.
1475 * The frame must already be setup; rate control must already have
1478 * XXX since the TXQ lock is being held here (and I dislike holding
1479 * it for this long when not doing software aggregation), later on
1480 * break this function into "setup_normal" and "xmit_normal". The
1481 * lock only needs to be held for the ath_tx_handoff call.
1483 * XXX we don't update the leak count here - if we're doing
1484 * direct frame dispatch, we need to be able to do it without
1485 * decrementing the leak count (eg multicast queue frames.)
1488 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1491 struct ath_node *an = ATH_NODE(bf->bf_node);
1492 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1494 ATH_TX_LOCK_ASSERT(sc);
1497 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1498 * set a completion handler however it doesn't (yet) properly
1499 * handle the strict ordering requirements needed for normal,
1500 * non-aggregate session frames.
1502 * Once this is implemented, only set CLRDMASK like this for
1503 * frames that must go out - eg management/raw frames.
1505 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1507 /* Setup the descriptor before handoff */
1508 ath_tx_do_ratelookup(sc, bf);
1509 ath_tx_calc_duration(sc, bf);
1510 ath_tx_calc_protection(sc, bf);
1511 ath_tx_set_rtscts(sc, bf);
1512 ath_tx_rate_fill_rcflags(sc, bf);
1513 ath_tx_setds(sc, bf);
1515 /* Track per-TID hardware queue depth correctly */
1518 /* Assign the completion handler */
1519 bf->bf_comp = ath_tx_normal_comp;
1521 /* Hand off to hardware */
1522 ath_tx_handoff(sc, txq, bf);
1526 * Do the basic frame setup stuff that's required before the frame
1527 * is added to a software queue.
1529 * All frames get mostly the same treatment and it's done once.
1530 * Retransmits fiddle with things like the rate control setup,
1531 * setting the retransmit bit in the packet; doing relevant DMA/bus
1532 * syncing and relinking it (back) into the hardware TX queue.
1534 * Note that this may cause the mbuf to be reallocated, so
1535 * m0 may not be valid.
1538 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1539 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1541 struct ieee80211vap *vap = ni->ni_vap;
1542 struct ath_hal *ah = sc->sc_ah;
1543 struct ifnet *ifp = sc->sc_ifp;
1544 struct ieee80211com *ic = ifp->if_l2com;
1545 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
1546 int error, iswep, ismcast, isfrag, ismrr;
1547 int keyix, hdrlen, pktlen, try0 = 0;
1548 u_int8_t rix = 0, txrate = 0;
1549 struct ath_desc *ds;
1550 struct ieee80211_frame *wh;
1551 u_int subtype, flags;
1553 const HAL_RATE_TABLE *rt;
1554 HAL_BOOL shortPreamble;
1555 struct ath_node *an;
1559 * To ensure that both sequence numbers and the CCMP PN handling
1560 * is "correct", make sure that the relevant TID queue is locked.
1561 * Otherwise the CCMP PN and seqno may appear out of order, causing
1562 * re-ordered frames to have out of order CCMP PN's, resulting
1563 * in many, many frame drops.
1565 ATH_TX_LOCK_ASSERT(sc);
1567 wh = mtod(m0, struct ieee80211_frame *);
1568 iswep = wh->i_fc[1] & IEEE80211_FC1_WEP;
1569 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1570 isfrag = m0->m_flags & M_FRAG;
1571 hdrlen = ieee80211_anyhdrsize(wh);
1573 * Packet length must not include any
1574 * pad bytes; deduct them here.
1576 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1578 /* Handle encryption twiddling if needed */
1579 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1585 /* packet header may have moved, reset our local pointer */
1586 wh = mtod(m0, struct ieee80211_frame *);
1588 pktlen += IEEE80211_CRC_LEN;
1591 * Load the DMA map so any coalescing is done. This
1592 * also calculates the number of descriptors we need.
1594 error = ath_tx_dmasetup(sc, bf, m0);
1597 bf->bf_node = ni; /* NB: held reference */
1598 m0 = bf->bf_m; /* NB: may have changed */
1599 wh = mtod(m0, struct ieee80211_frame *);
1601 /* setup descriptors */
1603 rt = sc->sc_currates;
1604 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1607 * NB: the 802.11 layer marks whether or not we should
1608 * use short preamble based on the current mode and
1609 * negotiated parameters.
1611 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1612 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1613 shortPreamble = AH_TRUE;
1614 sc->sc_stats.ast_tx_shortpre++;
1616 shortPreamble = AH_FALSE;
1620 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1622 ismrr = 0; /* default no multi-rate retry*/
1623 pri = M_WME_GETAC(m0); /* honor classification */
1624 /* XXX use txparams instead of fixed values */
1626 * Calculate Atheros packet type from IEEE80211 packet header,
1627 * setup for rate calculations, and select h/w transmit queue.
1629 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1630 case IEEE80211_FC0_TYPE_MGT:
1631 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1632 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1633 atype = HAL_PKT_TYPE_BEACON;
1634 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1635 atype = HAL_PKT_TYPE_PROBE_RESP;
1636 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1637 atype = HAL_PKT_TYPE_ATIM;
1639 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1640 rix = an->an_mgmtrix;
1641 txrate = rt->info[rix].rateCode;
1643 txrate |= rt->info[rix].shortPreamble;
1644 try0 = ATH_TXMGTTRY;
1645 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1647 case IEEE80211_FC0_TYPE_CTL:
1648 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1649 rix = an->an_mgmtrix;
1650 txrate = rt->info[rix].rateCode;
1652 txrate |= rt->info[rix].shortPreamble;
1653 try0 = ATH_TXMGTTRY;
1654 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1656 case IEEE80211_FC0_TYPE_DATA:
1657 atype = HAL_PKT_TYPE_NORMAL; /* default */
1659 * Data frames: multicast frames go out at a fixed rate,
1660 * EAPOL frames use the mgmt frame rate; otherwise consult
1661 * the rate control module for the rate to use.
1664 rix = an->an_mcastrix;
1665 txrate = rt->info[rix].rateCode;
1667 txrate |= rt->info[rix].shortPreamble;
1669 } else if (m0->m_flags & M_EAPOL) {
1670 /* XXX? maybe always use long preamble? */
1671 rix = an->an_mgmtrix;
1672 txrate = rt->info[rix].rateCode;
1674 txrate |= rt->info[rix].shortPreamble;
1675 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1678 * Do rate lookup on each TX, rather than using
1679 * the hard-coded TX information decided here.
1682 bf->bf_state.bfs_doratelookup = 1;
1684 if (cap->cap_wmeParams[pri].wmep_noackPolicy)
1685 flags |= HAL_TXDESC_NOACK;
1688 if_printf(ifp, "bogus frame type 0x%x (%s)\n",
1689 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1691 /* XXX free tx dmamap */
1697 * There are two known scenarios where the frame AC doesn't match
1698 * what the destination TXQ is.
1700 * + non-QoS frames (eg management?) that the net80211 stack has
1701 * assigned a higher AC to, but since it's a non-QoS TID, it's
1702 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1703 * It's quite possible that management frames should just be
1704 * direct dispatched to hardware rather than go via the software
1705 * queue; that should be investigated in the future. There are
1706 * some specific scenarios where this doesn't make sense, mostly
1707 * surrounding ADDBA request/response - hence why that is special
1710 * + Multicast frames going into the VAP mcast queue. That shows up
1713 * This driver should eventually support separate TID and TXQ locking,
1714 * allowing for arbitrary AC frames to appear on arbitrary software
1715 * queues, being queued to the "correct" hardware queue when needed.
1718 if (txq != sc->sc_ac2q[pri]) {
1719 DPRINTF(sc, ATH_DEBUG_XMIT,
1720 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1726 sc->sc_ac2q[pri]->axq_qnum);
1731 * Calculate miscellaneous flags.
1734 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1735 } else if (pktlen > vap->iv_rtsthreshold &&
1736 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1737 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1738 sc->sc_stats.ast_tx_rts++;
1740 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1741 sc->sc_stats.ast_tx_noack++;
1742 #ifdef IEEE80211_SUPPORT_TDMA
1743 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1744 DPRINTF(sc, ATH_DEBUG_TDMA,
1745 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1746 sc->sc_stats.ast_tdma_ack++;
1747 /* XXX free tx dmamap */
1754 * Determine if a tx interrupt should be generated for
1755 * this descriptor. We take a tx interrupt to reap
1756 * descriptors when the h/w hits an EOL condition or
1757 * when the descriptor is specifically marked to generate
1758 * an interrupt. We periodically mark descriptors in this
1759 * way to insure timely replenishing of the supply needed
1760 * for sending frames. Defering interrupts reduces system
1761 * load and potentially allows more concurrent work to be
1762 * done but if done to aggressively can cause senders to
1765 * NB: use >= to deal with sc_txintrperiod changing
1766 * dynamically through sysctl.
1768 if (flags & HAL_TXDESC_INTREQ) {
1769 txq->axq_intrcnt = 0;
1770 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1771 flags |= HAL_TXDESC_INTREQ;
1772 txq->axq_intrcnt = 0;
1775 /* This point forward is actual TX bits */
1778 * At this point we are committed to sending the frame
1779 * and we don't need to look at m_nextpkt; clear it in
1780 * case this frame is part of frag chain.
1782 m0->m_nextpkt = NULL;
1784 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1785 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1786 sc->sc_hwmap[rix].ieeerate, -1);
1788 if (ieee80211_radiotap_active_vap(vap)) {
1789 u_int64_t tsf = ath_hal_gettsf64(ah);
1791 sc->sc_tx_th.wt_tsf = htole64(tsf);
1792 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1794 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1796 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1797 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1798 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1799 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1801 ieee80211_radiotap_tx(vap, m0);
1804 /* Blank the legacy rate array */
1805 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1808 * ath_buf_set_rate needs at least one rate/try to setup
1809 * the rate scenario.
1811 bf->bf_state.bfs_rc[0].rix = rix;
1812 bf->bf_state.bfs_rc[0].tries = try0;
1813 bf->bf_state.bfs_rc[0].ratecode = txrate;
1815 /* Store the decided rate index values away */
1816 bf->bf_state.bfs_pktlen = pktlen;
1817 bf->bf_state.bfs_hdrlen = hdrlen;
1818 bf->bf_state.bfs_atype = atype;
1819 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1820 bf->bf_state.bfs_txrate0 = txrate;
1821 bf->bf_state.bfs_try0 = try0;
1822 bf->bf_state.bfs_keyix = keyix;
1823 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1824 bf->bf_state.bfs_txflags = flags;
1825 bf->bf_state.bfs_shpream = shortPreamble;
1827 /* XXX this should be done in ath_tx_setrate() */
1828 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1829 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1830 bf->bf_state.bfs_ctsduration = 0;
1831 bf->bf_state.bfs_ismrr = ismrr;
1837 * Queue a frame to the hardware or software queue.
1839 * This can be called by the net80211 code.
1841 * XXX what about locking? Or, push the seqno assign into the
1842 * XXX aggregate scheduler so its serialised?
1844 * XXX When sending management frames via ath_raw_xmit(),
1845 * should CLRDMASK be set unconditionally?
1848 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1849 struct ath_buf *bf, struct mbuf *m0)
1851 struct ieee80211vap *vap = ni->ni_vap;
1852 struct ath_vap *avp = ATH_VAP(vap);
1856 struct ath_txq *txq;
1858 const struct ieee80211_frame *wh;
1859 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1860 ieee80211_seq seqno;
1861 uint8_t type, subtype;
1864 ATH_TX_LOCK_ASSERT(sc);
1867 * Determine the target hardware queue.
1869 * For multicast frames, the txq gets overridden appropriately
1870 * depending upon the state of PS.
1872 * For any other frame, we do a TID/QoS lookup inside the frame
1873 * to see what the TID should be. If it's a non-QoS frame, the
1874 * AC and TID are overridden. The TID/TXQ code assumes the
1875 * TID is on a predictable hardware TXQ, so we don't support
1876 * having a node TID queued to multiple hardware TXQs.
1877 * This may change in the future but would require some locking
1880 pri = ath_tx_getac(sc, m0);
1881 tid = ath_tx_gettid(sc, m0);
1883 txq = sc->sc_ac2q[pri];
1884 wh = mtod(m0, struct ieee80211_frame *);
1885 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1886 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1887 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1890 * Enforce how deep the multicast queue can grow.
1892 * XXX duplicated in ath_raw_xmit().
1894 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1895 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1896 > sc->sc_txq_mcastq_maxdepth) {
1897 sc->sc_stats.ast_tx_mcastq_overflow++;
1904 * Enforce how deep the unicast queue can grow.
1906 * If the node is in power save then we don't want
1907 * the software queue to grow too deep, or a node may
1908 * end up consuming all of the ath_buf entries.
1910 * For now, only do this for DATA frames.
1912 * We will want to cap how many management/control
1913 * frames get punted to the software queue so it doesn't
1914 * fill up. But the correct solution isn't yet obvious.
1915 * In any case, this check should at least let frames pass
1916 * that we are direct-dispatching.
1918 * XXX TODO: duplicate this to the raw xmit path!
1920 if (type == IEEE80211_FC0_TYPE_DATA &&
1921 ATH_NODE(ni)->an_is_powersave &&
1922 ATH_NODE(ni)->an_swq_depth >
1923 sc->sc_txq_node_psq_maxdepth) {
1924 sc->sc_stats.ast_tx_node_psq_overflow++;
1930 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1931 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1932 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1934 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1935 __func__, tid, pri, is_ampdu);
1937 /* Set local packet state, used to queue packets to hardware */
1938 bf->bf_state.bfs_tid = tid;
1939 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
1940 bf->bf_state.bfs_pri = pri;
1944 * When servicing one or more stations in power-save mode
1945 * (or) if there is some mcast data waiting on the mcast
1946 * queue (to prevent out of order delivery) multicast frames
1947 * must be bufferd until after the beacon.
1949 * TODO: we should lock the mcastq before we check the length.
1951 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
1952 txq = &avp->av_mcastq;
1954 * Mark the frame as eventually belonging on the CAB
1955 * queue, so the descriptor setup functions will
1956 * correctly initialise the descriptor 'qcuId' field.
1958 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
1962 /* Do the generic frame setup */
1963 /* XXX should just bzero the bf_state? */
1964 bf->bf_state.bfs_dobaw = 0;
1966 /* A-MPDU TX? Manually set sequence number */
1968 * Don't do it whilst pending; the net80211 layer still
1973 * Always call; this function will
1974 * handle making sure that null data frames
1975 * don't get a sequence number from the current
1976 * TID and thus mess with the BAW.
1978 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
1981 * Don't add QoS NULL frames to the BAW.
1983 if (IEEE80211_QOS_HAS_SEQ(wh) &&
1984 subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL) {
1985 bf->bf_state.bfs_dobaw = 1;
1990 * If needed, the sequence number has been assigned.
1991 * Squirrel it away somewhere easy to get to.
1993 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
1995 /* Is ampdu pending? fetch the seqno and print it out */
1996 if (is_ampdu_pending)
1997 DPRINTF(sc, ATH_DEBUG_SW_TX,
1998 "%s: tid %d: ampdu pending, seqno %d\n",
1999 __func__, tid, M_SEQNO_GET(m0));
2001 /* This also sets up the DMA map */
2002 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
2007 /* At this point m0 could have changed! */
2012 * If it's a multicast frame, do a direct-dispatch to the
2013 * destination hardware queue. Don't bother software
2017 * If it's a BAR frame, do a direct dispatch to the
2018 * destination hardware queue. Don't bother software
2019 * queuing it, as the TID will now be paused.
2020 * Sending a BAR frame can occur from the net80211 txa timer
2021 * (ie, retries) or from the ath txtask (completion call.)
2022 * It queues directly to hardware because the TID is paused
2023 * at this point (and won't be unpaused until the BAR has
2024 * either been TXed successfully or max retries has been
2028 * Until things are better debugged - if this node is asleep
2029 * and we're sending it a non-BAR frame, direct dispatch it.
2030 * Why? Because we need to figure out what's actually being
2031 * sent - eg, during reassociation/reauthentication after
2032 * the node (last) disappeared whilst asleep, the driver should
2033 * have unpaused/unsleep'ed the node. So until that is
2034 * sorted out, use this workaround.
2036 if (txq == &avp->av_mcastq) {
2037 DPRINTF(sc, ATH_DEBUG_SW_TX,
2038 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2039 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2040 ath_tx_xmit_normal(sc, txq, bf);
2041 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2043 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2045 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2046 ath_tx_xmit_normal(sc, txq, bf);
2050 * For now, since there's no software queue,
2051 * direct-dispatch to the hardware.
2053 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2055 * Update the current leak count if
2056 * we're leaking frames; and set the
2057 * MORE flag as appropriate.
2059 ath_tx_leak_count_update(sc, tid, bf);
2060 ath_tx_xmit_normal(sc, txq, bf);
2067 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2068 struct ath_buf *bf, struct mbuf *m0,
2069 const struct ieee80211_bpf_params *params)
2071 struct ifnet *ifp = sc->sc_ifp;
2072 struct ieee80211com *ic = ifp->if_l2com;
2073 struct ath_hal *ah = sc->sc_ah;
2074 struct ieee80211vap *vap = ni->ni_vap;
2075 int error, ismcast, ismrr;
2076 int keyix, hdrlen, pktlen, try0, txantenna;
2077 u_int8_t rix, txrate;
2078 struct ieee80211_frame *wh;
2081 const HAL_RATE_TABLE *rt;
2082 struct ath_desc *ds;
2086 uint8_t type, subtype;
2089 ATH_TX_LOCK_ASSERT(sc);
2091 wh = mtod(m0, struct ieee80211_frame *);
2092 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2093 hdrlen = ieee80211_anyhdrsize(wh);
2095 * Packet length must not include any
2096 * pad bytes; deduct them here.
2098 /* XXX honor IEEE80211_BPF_DATAPAD */
2099 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2101 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2102 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2104 ATH_KTR(sc, ATH_KTR_TX, 2,
2105 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2107 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2110 pri = params->ibp_pri & 3;
2111 /* Override pri if the frame isn't a QoS one */
2112 if (! IEEE80211_QOS_HAS_SEQ(wh))
2113 pri = ath_tx_getac(sc, m0);
2115 /* XXX If it's an ADDBA, override the correct queue */
2116 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2118 /* Map ADDBA to the correct priority */
2121 DPRINTF(sc, ATH_DEBUG_XMIT,
2122 "%s: overriding tid %d pri %d -> %d\n",
2123 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2125 pri = TID_TO_WME_AC(o_tid);
2128 /* Handle encryption twiddling if needed */
2129 if (! ath_tx_tag_crypto(sc, ni,
2130 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2131 &hdrlen, &pktlen, &keyix)) {
2135 /* packet header may have moved, reset our local pointer */
2136 wh = mtod(m0, struct ieee80211_frame *);
2138 /* Do the generic frame setup */
2139 /* XXX should just bzero the bf_state? */
2140 bf->bf_state.bfs_dobaw = 0;
2142 error = ath_tx_dmasetup(sc, bf, m0);
2145 m0 = bf->bf_m; /* NB: may have changed */
2146 wh = mtod(m0, struct ieee80211_frame *);
2147 bf->bf_node = ni; /* NB: held reference */
2149 /* Always enable CLRDMASK for raw frames for now.. */
2150 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2151 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2152 if (params->ibp_flags & IEEE80211_BPF_RTS)
2153 flags |= HAL_TXDESC_RTSENA;
2154 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2155 /* XXX assume 11g/11n protection? */
2156 bf->bf_state.bfs_doprot = 1;
2157 flags |= HAL_TXDESC_CTSENA;
2159 /* XXX leave ismcast to injector? */
2160 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2161 flags |= HAL_TXDESC_NOACK;
2163 rt = sc->sc_currates;
2164 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2165 rix = ath_tx_findrix(sc, params->ibp_rate0);
2166 txrate = rt->info[rix].rateCode;
2167 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2168 txrate |= rt->info[rix].shortPreamble;
2170 try0 = params->ibp_try0;
2171 ismrr = (params->ibp_try1 != 0);
2172 txantenna = params->ibp_pri >> 2;
2173 if (txantenna == 0) /* XXX? */
2174 txantenna = sc->sc_txantenna;
2177 * Since ctsrate is fixed, store it away for later
2178 * use when the descriptor fields are being set.
2180 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2181 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2184 * NB: we mark all packets as type PSPOLL so the h/w won't
2185 * set the sequence number, duration, etc.
2187 atype = HAL_PKT_TYPE_PSPOLL;
2189 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2190 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2191 sc->sc_hwmap[rix].ieeerate, -1);
2193 if (ieee80211_radiotap_active_vap(vap)) {
2194 u_int64_t tsf = ath_hal_gettsf64(ah);
2196 sc->sc_tx_th.wt_tsf = htole64(tsf);
2197 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2198 if (wh->i_fc[1] & IEEE80211_FC1_WEP)
2199 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2200 if (m0->m_flags & M_FRAG)
2201 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2202 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2203 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2204 ieee80211_get_node_txpower(ni));
2205 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2207 ieee80211_radiotap_tx(vap, m0);
2211 * Formulate first tx descriptor with tx controls.
2214 /* XXX check return value? */
2216 /* Store the decided rate index values away */
2217 bf->bf_state.bfs_pktlen = pktlen;
2218 bf->bf_state.bfs_hdrlen = hdrlen;
2219 bf->bf_state.bfs_atype = atype;
2220 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2221 ieee80211_get_node_txpower(ni));
2222 bf->bf_state.bfs_txrate0 = txrate;
2223 bf->bf_state.bfs_try0 = try0;
2224 bf->bf_state.bfs_keyix = keyix;
2225 bf->bf_state.bfs_txantenna = txantenna;
2226 bf->bf_state.bfs_txflags = flags;
2227 bf->bf_state.bfs_shpream =
2228 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2230 /* Set local packet state, used to queue packets to hardware */
2231 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2232 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2233 bf->bf_state.bfs_pri = pri;
2235 /* XXX this should be done in ath_tx_setrate() */
2236 bf->bf_state.bfs_ctsrate = 0;
2237 bf->bf_state.bfs_ctsduration = 0;
2238 bf->bf_state.bfs_ismrr = ismrr;
2240 /* Blank the legacy rate array */
2241 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2243 bf->bf_state.bfs_rc[0].rix =
2244 ath_tx_findrix(sc, params->ibp_rate0);
2245 bf->bf_state.bfs_rc[0].tries = try0;
2246 bf->bf_state.bfs_rc[0].ratecode = txrate;
2251 rix = ath_tx_findrix(sc, params->ibp_rate1);
2252 bf->bf_state.bfs_rc[1].rix = rix;
2253 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2255 rix = ath_tx_findrix(sc, params->ibp_rate2);
2256 bf->bf_state.bfs_rc[2].rix = rix;
2257 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2259 rix = ath_tx_findrix(sc, params->ibp_rate3);
2260 bf->bf_state.bfs_rc[3].rix = rix;
2261 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2264 * All the required rate control decisions have been made;
2265 * fill in the rc flags.
2267 ath_tx_rate_fill_rcflags(sc, bf);
2269 /* NB: no buffered multicast in power save support */
2272 * If we're overiding the ADDBA destination, dump directly
2273 * into the hardware queue, right after any pending
2274 * frames to that node are.
2276 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2277 __func__, do_override);
2281 * Put addba frames in the right place in the right TID/HWQ.
2284 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2286 * XXX if it's addba frames, should we be leaking
2287 * them out via the frame leak method?
2288 * XXX for now let's not risk it; but we may wish
2289 * to investigate this later.
2291 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2292 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2294 /* Queue to software queue */
2295 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2297 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2298 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2301 /* Direct-dispatch to the hardware */
2302 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2304 * Update the current leak count if
2305 * we're leaking frames; and set the
2306 * MORE flag as appropriate.
2308 ath_tx_leak_count_update(sc, tid, bf);
2309 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2317 * This can be called by net80211.
2320 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2321 const struct ieee80211_bpf_params *params)
2323 struct ieee80211com *ic = ni->ni_ic;
2324 struct ifnet *ifp = ic->ic_ifp;
2325 struct ath_softc *sc = ifp->if_softc;
2327 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2331 if (sc->sc_inreset_cnt > 0) {
2332 DPRINTF(sc, ATH_DEBUG_XMIT,
2333 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2338 sc->sc_txstart_cnt++;
2343 if ((ifp->if_flags & IFF_RUNNING) == 0 || sc->sc_invalid) {
2344 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, %s", __func__,
2345 (ifp->if_flags & IFF_RUNNING) == 0 ?
2346 "!running" : "invalid");
2353 * Enforce how deep the multicast queue can grow.
2355 * XXX duplicated in ath_tx_start().
2357 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2358 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2359 > sc->sc_txq_mcastq_maxdepth) {
2360 sc->sc_stats.ast_tx_mcastq_overflow++;
2371 * Grab a TX buffer and associated resources.
2373 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2375 sc->sc_stats.ast_tx_nobuf++;
2380 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2383 if (params == NULL) {
2385 * Legacy path; interpret frame contents to decide
2386 * precisely how to send the frame.
2388 if (ath_tx_start(sc, ni, bf, m)) {
2389 error = EIO; /* XXX */
2394 * Caller supplied explicit parameters to use in
2395 * sending the frame.
2397 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2398 error = EIO; /* XXX */
2402 sc->sc_wd_timer = 5;
2404 sc->sc_stats.ast_tx_raw++;
2407 * Update the TIM - if there's anything queued to the
2408 * software queue and power save is enabled, we should
2411 ath_tx_update_tim(sc, ni, 1);
2416 sc->sc_txstart_cnt--;
2421 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2427 ath_returnbuf_head(sc, bf);
2428 ATH_TXBUF_UNLOCK(sc);
2434 sc->sc_txstart_cnt--;
2437 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2440 sc->sc_stats.ast_tx_raw_fail++;
2441 ieee80211_free_node(ni);
2446 /* Some helper functions */
2449 * ADDBA (and potentially others) need to be placed in the same
2450 * hardware queue as the TID/node it's relating to. This is so
2451 * it goes out after any pending non-aggregate frames to the
2454 * If this isn't done, the ADDBA can go out before the frames
2455 * queued in hardware. Even though these frames have a sequence
2456 * number -earlier- than the ADDBA can be transmitted (but
2457 * no frames whose sequence numbers are after the ADDBA should
2458 * be!) they'll arrive after the ADDBA - and the receiving end
2459 * will simply drop them as being out of the BAW.
2461 * The frames can't be appended to the TID software queue - it'll
2462 * never be sent out. So these frames have to be directly
2463 * dispatched to the hardware, rather than queued in software.
2464 * So if this function returns true, the TXQ has to be
2465 * overridden and it has to be directly dispatched.
2467 * It's a dirty hack, but someone's gotta do it.
2471 * XXX doesn't belong here!
2474 ieee80211_is_action(struct ieee80211_frame *wh)
2476 /* Type: Management frame? */
2477 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2478 IEEE80211_FC0_TYPE_MGT)
2481 /* Subtype: Action frame? */
2482 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2483 IEEE80211_FC0_SUBTYPE_ACTION)
2489 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2491 * Return an alternate TID for ADDBA request frames.
2493 * Yes, this likely should be done in the net80211 layer.
2496 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2497 struct ieee80211_node *ni,
2498 struct mbuf *m0, int *tid)
2500 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2501 struct ieee80211_action_ba_addbarequest *ia;
2503 uint16_t baparamset;
2505 /* Not action frame? Bail */
2506 if (! ieee80211_is_action(wh))
2509 /* XXX Not needed for frames we send? */
2511 /* Correct length? */
2512 if (! ieee80211_parse_action(ni, m))
2516 /* Extract out action frame */
2517 frm = (u_int8_t *)&wh[1];
2518 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2520 /* Not ADDBA? Bail */
2521 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2523 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2526 /* Extract TID, return it */
2527 baparamset = le16toh(ia->rq_baparamset);
2528 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2534 /* Per-node software queue operations */
2537 * Add the current packet to the given BAW.
2538 * It is assumed that the current packet
2540 * + fits inside the BAW;
2541 * + already has had a sequence number allocated.
2543 * Since the BAW status may be modified by both the ath task and
2544 * the net80211/ifnet contexts, the TID must be locked.
2547 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2548 struct ath_tid *tid, struct ath_buf *bf)
2551 struct ieee80211_tx_ampdu *tap;
2553 ATH_TX_LOCK_ASSERT(sc);
2555 if (bf->bf_state.bfs_isretried)
2558 tap = ath_tx_get_tx_tid(an, tid->tid);
2560 if (! bf->bf_state.bfs_dobaw) {
2561 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2562 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2563 __func__, SEQNO(bf->bf_state.bfs_seqno),
2564 tap->txa_start, tap->txa_wnd);
2567 if (bf->bf_state.bfs_addedbaw)
2568 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2569 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2570 "baw head=%d tail=%d\n",
2571 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2572 tap->txa_start, tap->txa_wnd, tid->baw_head,
2576 * Verify that the given sequence number is not outside of the
2577 * BAW. Complain loudly if that's the case.
2579 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2580 SEQNO(bf->bf_state.bfs_seqno))) {
2581 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2582 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2583 "baw head=%d tail=%d\n",
2584 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2585 tap->txa_start, tap->txa_wnd, tid->baw_head,
2590 * ni->ni_txseqs[] is the currently allocated seqno.
2591 * the txa state contains the current baw start.
2593 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2594 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2595 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2596 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2597 "baw head=%d tail=%d\n",
2598 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2599 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2604 assert(tid->tx_buf[cindex] == NULL);
2606 if (tid->tx_buf[cindex] != NULL) {
2607 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2608 "%s: ba packet dup (index=%d, cindex=%d, "
2609 "head=%d, tail=%d)\n",
2610 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2611 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2612 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2614 tid->tx_buf[cindex],
2615 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2617 SEQNO(bf->bf_state.bfs_seqno)
2620 tid->tx_buf[cindex] = bf;
2622 if (index >= ((tid->baw_tail - tid->baw_head) &
2623 (ATH_TID_MAX_BUFS - 1))) {
2624 tid->baw_tail = cindex;
2625 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2630 * Flip the BAW buffer entry over from the existing one to the new one.
2632 * When software retransmitting a (sub-)frame, it is entirely possible that
2633 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2634 * In that instance the buffer is cloned and the new buffer is used for
2635 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2636 * tracking array to maintain consistency.
2639 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2640 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2643 struct ieee80211_tx_ampdu *tap;
2644 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2646 ATH_TX_LOCK_ASSERT(sc);
2648 tap = ath_tx_get_tx_tid(an, tid->tid);
2649 index = ATH_BA_INDEX(tap->txa_start, seqno);
2650 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2653 * Just warn for now; if it happens then we should find out
2654 * about it. It's highly likely the aggregation session will
2657 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2658 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2659 "%s: retransmitted buffer"
2660 " has mismatching seqno's, BA session may hang.\n",
2662 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2663 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2664 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2667 if (tid->tx_buf[cindex] != old_bf) {
2668 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2669 "%s: ath_buf pointer incorrect; "
2670 " has m BA session may hang.\n", __func__);
2671 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2672 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2675 tid->tx_buf[cindex] = new_bf;
2679 * seq_start - left edge of BAW
2680 * seq_next - current/next sequence number to allocate
2682 * Since the BAW status may be modified by both the ath task and
2683 * the net80211/ifnet contexts, the TID must be locked.
2686 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2687 struct ath_tid *tid, const struct ath_buf *bf)
2690 struct ieee80211_tx_ampdu *tap;
2691 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2693 ATH_TX_LOCK_ASSERT(sc);
2695 tap = ath_tx_get_tx_tid(an, tid->tid);
2696 index = ATH_BA_INDEX(tap->txa_start, seqno);
2697 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2699 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2700 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2701 "baw head=%d, tail=%d\n",
2702 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2703 cindex, tid->baw_head, tid->baw_tail);
2706 * If this occurs then we have a big problem - something else
2707 * has slid tap->txa_start along without updating the BAW
2708 * tracking start/end pointers. Thus the TX BAW state is now
2709 * completely busted.
2711 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2712 * it's quite possible that a cloned buffer is making its way
2713 * here and causing it to fire off. Disable TDMA for now.
2715 if (tid->tx_buf[cindex] != bf) {
2716 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2717 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2718 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2719 tid->tx_buf[cindex],
2720 (tid->tx_buf[cindex] != NULL) ?
2721 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2724 tid->tx_buf[cindex] = NULL;
2726 while (tid->baw_head != tid->baw_tail &&
2727 !tid->tx_buf[tid->baw_head]) {
2728 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2729 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2731 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2732 "%s: baw is now %d:%d, baw head=%d\n",
2733 __func__, tap->txa_start, tap->txa_wnd, tid->baw_head);
2737 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2740 struct ieee80211_frame *wh;
2742 ATH_TX_LOCK_ASSERT(sc);
2744 if (tid->an->an_leak_count > 0) {
2745 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2748 * Update MORE based on the software/net80211 queue states.
2750 if ((tid->an->an_stack_psq > 0)
2751 || (tid->an->an_swq_depth > 0))
2752 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2754 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2756 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2757 "%s: %s: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2759 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
2760 tid->an->an_leak_count,
2761 tid->an->an_stack_psq,
2762 tid->an->an_swq_depth,
2763 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2766 * Re-sync the underlying buffer.
2768 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2769 BUS_DMASYNC_PREWRITE);
2771 tid->an->an_leak_count --;
2776 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2779 ATH_TX_LOCK_ASSERT(sc);
2781 if (tid->an->an_leak_count > 0) {
2790 * Mark the current node/TID as ready to TX.
2792 * This is done to make it easy for the software scheduler to
2793 * find which nodes have data to send.
2795 * The TXQ lock must be held.
2798 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2800 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2802 ATH_TX_LOCK_ASSERT(sc);
2805 * If we are leaking out a frame to this destination
2806 * for PS-POLL, ensure that we allow scheduling to
2809 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2810 return; /* paused, can't schedule yet */
2813 return; /* already scheduled */
2819 * If this is a sleeping node we're leaking to, given
2820 * it a higher priority. This is so bad for QoS it hurts.
2822 if (tid->an->an_leak_count) {
2823 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2825 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2830 * We can't do the above - it'll confuse the TXQ software
2831 * scheduler which will keep checking the _head_ TID
2832 * in the list to see if it has traffic. If we queue
2833 * a TID to the head of the list and it doesn't transmit,
2834 * we'll check it again.
2836 * So, get the rest of this leaking frames support working
2837 * and reliable first and _then_ optimise it so they're
2838 * pushed out in front of any other pending software
2841 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2845 * Mark the current node as no longer needing to be polled for
2848 * The TXQ lock must be held.
2851 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2853 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2855 ATH_TX_LOCK_ASSERT(sc);
2857 if (tid->sched == 0)
2861 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2865 * Assign a sequence number manually to the given frame.
2867 * This should only be called for A-MPDU TX frames.
2869 static ieee80211_seq
2870 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2871 struct ath_buf *bf, struct mbuf *m0)
2873 struct ieee80211_frame *wh;
2875 ieee80211_seq seqno;
2879 wh = mtod(m0, struct ieee80211_frame *);
2880 pri = M_WME_GETAC(m0); /* honor classification */
2881 tid = WME_AC_TO_TID(pri);
2882 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pri=%d, tid=%d, qos has seq=%d\n",
2883 __func__, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
2885 /* XXX Is it a control frame? Ignore */
2887 /* Does the packet require a sequence number? */
2888 if (! IEEE80211_QOS_HAS_SEQ(wh))
2891 ATH_TX_LOCK_ASSERT(sc);
2894 * Is it a QOS NULL Data frame? Give it a sequence number from
2895 * the default TID (IEEE80211_NONQOS_TID.)
2897 * The RX path of everything I've looked at doesn't include the NULL
2898 * data frame sequence number in the aggregation state updates, so
2899 * assigning it a sequence number there will cause a BAW hole on the
2902 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2903 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
2904 /* XXX no locking for this TID? This is a bit of a problem. */
2905 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
2906 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
2908 /* Manually assign sequence number */
2909 seqno = ni->ni_txseqs[tid];
2910 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
2912 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
2913 M_SEQNO_SET(m0, seqno);
2915 /* Return so caller can do something with it if needed */
2916 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: -> seqno=%d\n", __func__, seqno);
2921 * Attempt to direct dispatch an aggregate frame to hardware.
2922 * If the frame is out of BAW, queue.
2923 * Otherwise, schedule it as a single frame.
2926 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
2927 struct ath_txq *txq, struct ath_buf *bf)
2929 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
2930 struct ieee80211_tx_ampdu *tap;
2932 ATH_TX_LOCK_ASSERT(sc);
2934 tap = ath_tx_get_tx_tid(an, tid->tid);
2937 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
2938 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2939 /* XXX don't sched - we're paused! */
2943 /* outside baw? queue */
2944 if (bf->bf_state.bfs_dobaw &&
2945 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2946 SEQNO(bf->bf_state.bfs_seqno)))) {
2947 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2948 ath_tx_tid_sched(sc, tid);
2953 * This is a temporary check and should be removed once
2954 * all the relevant code paths have been fixed.
2956 * During aggregate retries, it's possible that the head
2957 * frame will fail (which has the bfs_aggr and bfs_nframes
2958 * fields set for said aggregate) and will be retried as
2959 * a single frame. In this instance, the values should
2960 * be reset or the completion code will get upset with you.
2962 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
2963 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
2964 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
2965 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
2966 bf->bf_state.bfs_aggr = 0;
2967 bf->bf_state.bfs_nframes = 1;
2970 /* Update CLRDMASK just before this frame is queued */
2971 ath_tx_update_clrdmask(sc, tid, bf);
2973 /* Direct dispatch to hardware */
2974 ath_tx_do_ratelookup(sc, bf);
2975 ath_tx_calc_duration(sc, bf);
2976 ath_tx_calc_protection(sc, bf);
2977 ath_tx_set_rtscts(sc, bf);
2978 ath_tx_rate_fill_rcflags(sc, bf);
2979 ath_tx_setds(sc, bf);
2982 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
2984 /* Track per-TID hardware queue depth correctly */
2988 if (bf->bf_state.bfs_dobaw) {
2989 ath_tx_addto_baw(sc, an, tid, bf);
2990 bf->bf_state.bfs_addedbaw = 1;
2993 /* Set completion handler, multi-frame aggregate or not */
2994 bf->bf_comp = ath_tx_aggr_comp;
2997 * Update the current leak count if
2998 * we're leaking frames; and set the
2999 * MORE flag as appropriate.
3001 ath_tx_leak_count_update(sc, tid, bf);
3003 /* Hand off to hardware */
3004 ath_tx_handoff(sc, txq, bf);
3008 * Attempt to send the packet.
3009 * If the queue isn't busy, direct-dispatch.
3010 * If the queue is busy enough, queue the given packet on the
3011 * relevant software queue.
3014 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3015 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3017 struct ath_node *an = ATH_NODE(ni);
3018 struct ieee80211_frame *wh;
3019 struct ath_tid *atid;
3021 struct mbuf *m0 = bf->bf_m;
3023 ATH_TX_LOCK_ASSERT(sc);
3025 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3026 wh = mtod(m0, struct ieee80211_frame *);
3027 pri = ath_tx_getac(sc, m0);
3028 tid = ath_tx_gettid(sc, m0);
3029 atid = &an->an_tid[tid];
3031 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3032 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3034 /* Set local packet state, used to queue packets to hardware */
3035 /* XXX potentially duplicate info, re-check */
3036 bf->bf_state.bfs_tid = tid;
3037 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3038 bf->bf_state.bfs_pri = pri;
3041 * If the hardware queue isn't busy, queue it directly.
3042 * If the hardware queue is busy, queue it.
3043 * If the TID is paused or the traffic it outside BAW, software
3046 * If the node is in power-save and we're leaking a frame,
3047 * leak a single frame.
3049 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3050 /* TID is paused, queue */
3051 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3053 * If the caller requested that it be sent at a high
3054 * priority, queue it at the head of the list.
3057 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3059 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3060 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3061 /* AMPDU pending; queue */
3062 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3063 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3065 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3066 /* AMPDU running, attempt direct dispatch if possible */
3069 * Always queue the frame to the tail of the list.
3071 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3074 * If the hardware queue isn't busy, direct dispatch
3075 * the head frame in the list. Don't schedule the
3076 * TID - let it build some more frames first?
3078 * When running A-MPDU, always just check the hardware
3079 * queue depth against the aggregate frame limit.
3080 * We don't want to burst a large number of single frames
3081 * out to the hardware; we want to aggressively hold back.
3083 * Otherwise, schedule the TID.
3085 /* XXX TXQ locking */
3086 if (txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_aggr) {
3087 bf = ATH_TID_FIRST(atid);
3088 ATH_TID_REMOVE(atid, bf, bf_list);
3091 * Ensure it's definitely treated as a non-AMPDU
3092 * frame - this information may have been left
3093 * over from a previous attempt.
3095 bf->bf_state.bfs_aggr = 0;
3096 bf->bf_state.bfs_nframes = 1;
3098 /* Queue to the hardware */
3099 ath_tx_xmit_aggr(sc, an, txq, bf);
3100 DPRINTF(sc, ATH_DEBUG_SW_TX,
3104 DPRINTF(sc, ATH_DEBUG_SW_TX,
3105 "%s: ampdu; swq'ing\n",
3108 ath_tx_tid_sched(sc, atid);
3111 * If we're not doing A-MPDU, be prepared to direct dispatch
3112 * up to both limits if possible. This particular corner
3113 * case may end up with packet starvation between aggregate
3114 * traffic and non-aggregate traffic: we wnat to ensure
3115 * that non-aggregate stations get a few frames queued to the
3116 * hardware before the aggregate station(s) get their chance.
3118 * So if you only ever see a couple of frames direct dispatched
3119 * to the hardware from a non-AMPDU client, check both here
3120 * and in the software queue dispatcher to ensure that those
3121 * non-AMPDU stations get a fair chance to transmit.
3123 /* XXX TXQ locking */
3124 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3125 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3126 /* AMPDU not running, attempt direct dispatch */
3127 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3128 /* See if clrdmask needs to be set */
3129 ath_tx_update_clrdmask(sc, atid, bf);
3132 * Update the current leak count if
3133 * we're leaking frames; and set the
3134 * MORE flag as appropriate.
3136 ath_tx_leak_count_update(sc, atid, bf);
3139 * Dispatch the frame.
3141 ath_tx_xmit_normal(sc, txq, bf);
3144 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3145 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3146 ath_tx_tid_sched(sc, atid);
3151 * Only set the clrdmask bit if none of the nodes are currently
3154 * XXX TODO: go through all the callers and check to see
3155 * which are being called in the context of looping over all
3156 * TIDs (eg, if all tids are being paused, resumed, etc.)
3157 * That'll avoid O(n^2) complexity here.
3160 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3164 ATH_TX_LOCK_ASSERT(sc);
3166 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3167 if (an->an_tid[i].isfiltered == 1)
3174 * Configure the per-TID node state.
3176 * This likely belongs in if_ath_node.c but I can't think of anywhere
3177 * else to put it just yet.
3179 * This sets up the SLISTs and the mutex as appropriate.
3182 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3185 struct ath_tid *atid;
3187 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3188 atid = &an->an_tid[i];
3190 /* XXX now with this bzer(), is the field 0'ing needed? */
3191 bzero(atid, sizeof(*atid));
3193 TAILQ_INIT(&atid->tid_q);
3194 TAILQ_INIT(&atid->filtq.tid_q);
3197 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3198 atid->tx_buf[j] = NULL;
3199 atid->baw_head = atid->baw_tail = 0;
3202 atid->hwq_depth = 0;
3203 atid->cleanup_inprogress = 0;
3204 if (i == IEEE80211_NONQOS_TID)
3205 atid->ac = ATH_NONQOS_TID_AC;
3207 atid->ac = TID_TO_WME_AC(i);
3209 an->clrdmask = 1; /* Always start by setting this bit */
3213 * Pause the current TID. This stops packets from being transmitted
3216 * Since this is also called from upper layers as well as the driver,
3217 * it will get the TID lock.
3220 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3223 ATH_TX_LOCK_ASSERT(sc);
3225 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: paused = %d\n",
3226 __func__, tid->paused);
3230 * Unpause the current TID, and schedule it if needed.
3233 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3235 ATH_TX_LOCK_ASSERT(sc);
3238 * There's some odd places where ath_tx_tid_resume() is called
3239 * when it shouldn't be; this works around that particular issue
3240 * until it's actually resolved.
3242 if (tid->paused == 0) {
3243 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3244 "%s: %s: paused=0?\n", __func__,
3245 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr));
3250 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: unpaused = %d\n",
3251 __func__, tid->paused);
3257 * Override the clrdmask configuration for the next frame
3258 * from this TID, just to get the ball rolling.
3260 ath_tx_set_clrdmask(sc, tid->an);
3262 if (tid->axq_depth == 0)
3265 /* XXX isfiltered shouldn't ever be 0 at this point */
3266 if (tid->isfiltered == 1) {
3267 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3272 ath_tx_tid_sched(sc, tid);
3275 * Queue the software TX scheduler.
3277 ath_tx_swq_kick(sc);
3281 * Add the given ath_buf to the TID filtered frame list.
3282 * This requires the TID be filtered.
3285 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3289 ATH_TX_LOCK_ASSERT(sc);
3291 if (!tid->isfiltered)
3292 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3295 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3297 /* Set the retry bit and bump the retry counter */
3298 ath_tx_set_retry(sc, bf);
3299 sc->sc_stats.ast_tx_swfiltered++;
3301 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3305 * Handle a completed filtered frame from the given TID.
3306 * This just enables/pauses the filtered frame state if required
3307 * and appends the filtered frame to the filtered queue.
3310 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3314 ATH_TX_LOCK_ASSERT(sc);
3316 if (! tid->isfiltered) {
3317 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: filter transition\n",
3319 tid->isfiltered = 1;
3320 ath_tx_tid_pause(sc, tid);
3323 /* Add the frame to the filter queue */
3324 ath_tx_tid_filt_addbuf(sc, tid, bf);
3328 * Complete the filtered frame TX completion.
3330 * If there are no more frames in the hardware queue, unpause/unfilter
3331 * the TID if applicable. Otherwise we will wait for a node PS transition
3335 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3339 ATH_TX_LOCK_ASSERT(sc);
3341 if (tid->hwq_depth != 0)
3344 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: hwq=0, transition back\n",
3346 tid->isfiltered = 0;
3347 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3348 ath_tx_set_clrdmask(sc, tid->an);
3350 /* XXX this is really quite inefficient */
3351 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3352 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3353 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3356 ath_tx_tid_resume(sc, tid);
3360 * Called when a single (aggregate or otherwise) frame is completed.
3362 * Returns 1 if the buffer could be added to the filtered list
3363 * (cloned or otherwise), 0 if the buffer couldn't be added to the
3364 * filtered list (failed clone; expired retry) and the caller should
3365 * free it and handle it like a failure (eg by sending a BAR.)
3368 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3371 struct ath_buf *nbf;
3374 ATH_TX_LOCK_ASSERT(sc);
3377 * Don't allow a filtered frame to live forever.
3379 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3380 sc->sc_stats.ast_tx_swretrymax++;
3381 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3382 "%s: bf=%p, seqno=%d, exceeded retries\n",
3385 bf->bf_state.bfs_seqno);
3390 * A busy buffer can't be added to the retry list.
3391 * It needs to be cloned.
3393 if (bf->bf_flags & ATH_BUF_BUSY) {
3394 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3395 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3396 "%s: busy buffer clone: %p -> %p\n",
3403 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3404 "%s: busy buffer couldn't be cloned (%p)!\n",
3408 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3411 ath_tx_tid_filt_comp_complete(sc, tid);
3417 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3418 struct ath_buf *bf_first, ath_bufhead *bf_q)
3420 struct ath_buf *bf, *bf_next, *nbf;
3422 ATH_TX_LOCK_ASSERT(sc);
3426 bf_next = bf->bf_next;
3427 bf->bf_next = NULL; /* Remove it from the aggr list */
3430 * Don't allow a filtered frame to live forever.
3432 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3433 sc->sc_stats.ast_tx_swretrymax++;
3434 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3435 "%s: bf=%p, seqno=%d, exceeded retries\n",
3438 bf->bf_state.bfs_seqno);
3439 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3443 if (bf->bf_flags & ATH_BUF_BUSY) {
3444 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3445 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3446 "%s: busy buffer cloned: %p -> %p",
3453 * If the buffer couldn't be cloned, add it to bf_q;
3454 * the caller will free the buffer(s) as required.
3457 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3458 "%s: buffer couldn't be cloned! (%p)\n",
3460 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3462 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3468 ath_tx_tid_filt_comp_complete(sc, tid);
3472 * Suspend the queue because we need to TX a BAR.
3475 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3478 ATH_TX_LOCK_ASSERT(sc);
3480 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3481 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3487 /* We shouldn't be called when bar_tx is 1 */
3489 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3490 "%s: bar_tx is 1?!\n", __func__);
3493 /* If we've already been called, just be patient. */
3500 /* Only one pause, no matter how many frames fail */
3501 ath_tx_tid_pause(sc, tid);
3505 * We've finished with BAR handling - either we succeeded or
3506 * failed. Either way, unsuspend TX.
3509 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3512 ATH_TX_LOCK_ASSERT(sc);
3514 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3515 "%s: %s: TID=%d, called\n",
3517 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3520 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3521 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3522 "%s: %s: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3524 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3525 tid->tid, tid->bar_tx, tid->bar_wait);
3528 tid->bar_tx = tid->bar_wait = 0;
3529 ath_tx_tid_resume(sc, tid);
3533 * Return whether we're ready to TX a BAR frame.
3535 * Requires the TID lock be held.
3538 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3541 ATH_TX_LOCK_ASSERT(sc);
3543 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3546 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3547 "%s: %s: TID=%d, bar ready\n",
3549 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3556 * Check whether the current TID is ready to have a BAR
3557 * TXed and if so, do the TX.
3559 * Since the TID/TXQ lock can't be held during a call to
3560 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3561 * sending the BAR and locking it again.
3563 * Eventually, the code to send the BAR should be broken out
3564 * from this routine so the lock doesn't have to be reacquired
3565 * just to be immediately dropped by the caller.
3568 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3570 struct ieee80211_tx_ampdu *tap;
3572 ATH_TX_LOCK_ASSERT(sc);
3574 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3575 "%s: %s: TID=%d, called\n",
3577 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3580 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3583 * This is an error condition!
3585 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3586 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3587 "%s: %s: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3589 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3590 tid->tid, tid->bar_tx, tid->bar_wait);
3594 /* Don't do anything if we still have pending frames */
3595 if (tid->hwq_depth > 0) {
3596 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3597 "%s: %s: TID=%d, hwq_depth=%d, waiting\n",
3599 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3605 /* We're now about to TX */
3609 * Override the clrdmask configuration for the next frame,
3610 * just to get the ball rolling.
3612 ath_tx_set_clrdmask(sc, tid->an);
3615 * Calculate new BAW left edge, now that all frames have either
3616 * succeeded or failed.
3618 * XXX verify this is _actually_ the valid value to begin at!
3620 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3621 "%s: %s: TID=%d, new BAW left edge=%d\n",
3623 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3627 /* Try sending the BAR frame */
3628 /* We can't hold the lock here! */
3631 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3632 /* Success? Now we wait for notification that it's done */
3637 /* Failure? For now, warn loudly and continue */
3639 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3640 "%s: %s: TID=%d, failed to TX BAR, continue!\n",
3641 __func__, ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3643 ath_tx_tid_bar_unsuspend(sc, tid);
3647 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3648 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3651 ATH_TX_LOCK_ASSERT(sc);
3654 * If the current TID is running AMPDU, update
3657 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3658 bf->bf_state.bfs_dobaw) {
3660 * Only remove the frame from the BAW if it's
3661 * been transmitted at least once; this means
3662 * the frame was in the BAW to begin with.
3664 if (bf->bf_state.bfs_retries > 0) {
3665 ath_tx_update_baw(sc, an, tid, bf);
3666 bf->bf_state.bfs_dobaw = 0;
3670 * This has become a non-fatal error now
3672 if (! bf->bf_state.bfs_addedbaw)
3673 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3674 "%s: wasn't added: seqno %d\n",
3675 __func__, SEQNO(bf->bf_state.bfs_seqno));
3679 /* Strip it out of an aggregate list if it was in one */
3682 /* Insert on the free queue to be freed by the caller */
3683 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3687 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3688 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3690 struct ieee80211_node *ni = &an->an_node;
3691 struct ath_txq *txq;
3692 struct ieee80211_tx_ampdu *tap;
3694 txq = sc->sc_ac2q[tid->ac];
3695 tap = ath_tx_get_tx_tid(an, tid->tid);
3697 DPRINTF(sc, ATH_DEBUG_SW_TX,
3698 "%s: %s: %s: bf=%p: addbaw=%d, dobaw=%d, "
3699 "seqno=%d, retry=%d\n",
3702 ath_hal_ether_sprintf(ni->ni_macaddr),
3704 bf->bf_state.bfs_addedbaw,
3705 bf->bf_state.bfs_dobaw,
3706 SEQNO(bf->bf_state.bfs_seqno),
3707 bf->bf_state.bfs_retries);
3708 DPRINTF(sc, ATH_DEBUG_SW_TX,
3709 "%s: %s: %s: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3712 ath_hal_ether_sprintf(ni->ni_macaddr),
3716 txq->axq_aggr_depth);
3717 DPRINTF(sc, ATH_DEBUG_SW_TX,
3718 "%s: %s: %s: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3722 ath_hal_ether_sprintf(ni->ni_macaddr),
3728 DPRINTF(sc, ATH_DEBUG_SW_TX,
3729 "%s: %s: %s: tid %d: "
3730 "sched=%d, paused=%d, "
3731 "incomp=%d, baw_head=%d, "
3732 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3735 ath_hal_ether_sprintf(ni->ni_macaddr),
3737 tid->sched, tid->paused,
3738 tid->incomp, tid->baw_head,
3739 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3740 ni->ni_txseqs[tid->tid]);
3742 /* XXX Dump the frame, see what it is? */
3743 ieee80211_dump_pkt(ni->ni_ic,
3744 mtod(bf->bf_m, const uint8_t *),
3745 bf->bf_m->m_len, 0, -1);
3749 * Free any packets currently pending in the software TX queue.
3751 * This will be called when a node is being deleted.
3753 * It can also be called on an active node during an interface
3754 * reset or state transition.
3756 * (From Linux/reference):
3758 * TODO: For frame(s) that are in the retry state, we will reuse the
3759 * sequence number(s) without setting the retry bit. The
3760 * alternative is to give up on these and BAR the receiver's window
3764 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3765 struct ath_tid *tid, ath_bufhead *bf_cq)
3768 struct ieee80211_tx_ampdu *tap;
3769 struct ieee80211_node *ni = &an->an_node;
3772 tap = ath_tx_get_tx_tid(an, tid->tid);
3774 ATH_TX_LOCK_ASSERT(sc);
3776 /* Walk the queue, free frames */
3779 bf = ATH_TID_FIRST(tid);
3785 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3789 ATH_TID_REMOVE(tid, bf, bf_list);
3790 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3793 /* And now, drain the filtered frame queue */
3796 bf = ATH_TID_FILT_FIRST(tid);
3801 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3805 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3806 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3810 * Override the clrdmask configuration for the next frame
3811 * in case there is some future transmission, just to get
3814 * This won't hurt things if the TID is about to be freed.
3816 ath_tx_set_clrdmask(sc, tid->an);
3819 * Now that it's completed, grab the TID lock and update
3820 * the sequence number and BAW window.
3821 * Because sequence numbers have been assigned to frames
3822 * that haven't been sent yet, it's entirely possible
3823 * we'll be called with some pending frames that have not
3826 * The cleaner solution is to do the sequence number allocation
3827 * when the packet is first transmitted - and thus the "retries"
3828 * check above would be enough to update the BAW/seqno.
3831 /* But don't do it for non-QoS TIDs */
3834 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3835 "%s: %s: node %p: TID %d: sliding BAW left edge to %d\n",
3837 ath_hal_ether_sprintf(ni->ni_macaddr),
3842 ni->ni_txseqs[tid->tid] = tap->txa_start;
3843 tid->baw_tail = tid->baw_head;
3848 * Reset the TID state. This must be only called once the node has
3849 * had its frames flushed from this TID, to ensure that no other
3850 * pause / unpause logic can kick in.
3853 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
3857 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
3858 tid->paused = tid->sched = tid->addba_tx_pending = 0;
3859 tid->incomp = tid->cleanup_inprogress = 0;
3863 * If we have a bar_wait set, we need to unpause the TID
3864 * here. Otherwise once cleanup has finished, the TID won't
3865 * have the right paused counter.
3867 * XXX I'm not going through resume here - I don't want the
3868 * node to be rescheuled just yet. This however should be
3871 if (tid->bar_wait) {
3872 if (tid->paused > 0) {
3878 * XXX same with a currently filtered TID.
3880 * Since this is being called during a flush, we assume that
3881 * the filtered frame list is actually empty.
3883 * XXX TODO: add in a check to ensure that the filtered queue
3884 * depth is actually 0!
3886 if (tid->isfiltered) {
3887 if (tid->paused > 0) {
3893 * Clear BAR, filtered frames, scheduled and ADDBA pending.
3894 * The TID may be going through cleanup from the last association
3895 * where things in the BAW are still in the hardware queue.
3899 tid->isfiltered = 0;
3901 tid->addba_tx_pending = 0;
3904 * XXX TODO: it may just be enough to walk the HWQs and mark
3905 * frames for that node as non-aggregate; or mark the ath_node
3906 * with something that indicates that aggregation is no longer
3907 * occuring. Then we can just toss the BAW complaints and
3908 * do a complete hard reset of state here - no pause, no
3909 * complete counter, etc.
3915 * Flush all software queued packets for the given node.
3917 * This occurs when a completion handler frees the last buffer
3918 * for a node, and the node is thus freed. This causes the node
3919 * to be cleaned up, which ends up calling ath_tx_node_flush.
3922 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
3930 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
3934 DPRINTF(sc, ATH_DEBUG_NODE,
3935 "%s: %s: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
3936 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
3938 ath_hal_ether_sprintf(an->an_node.ni_macaddr),
3939 an->an_is_powersave,
3946 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
3947 struct ath_tid *atid = &an->an_tid[tid];
3950 ath_tx_tid_drain(sc, an, atid, &bf_cq);
3952 /* Remove this tid from the list of active tids */
3953 ath_tx_tid_unsched(sc, atid);
3955 /* Reset the per-TID pause, BAR, etc state */
3956 ath_tx_tid_reset(sc, atid);
3960 * Clear global leak count
3962 an->an_leak_count = 0;
3965 /* Handle completed frames */
3966 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
3967 TAILQ_REMOVE(&bf_cq, bf, bf_list);
3968 ath_tx_default_comp(sc, bf, 0);
3973 * Drain all the software TXQs currently with traffic queued.
3976 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
3978 struct ath_tid *tid;
3986 * Iterate over all active tids for the given txq,
3987 * flushing and unsched'ing them
3989 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
3990 tid = TAILQ_FIRST(&txq->axq_tidq);
3991 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
3992 ath_tx_tid_unsched(sc, tid);
3997 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
3998 TAILQ_REMOVE(&bf_cq, bf, bf_list);
3999 ath_tx_default_comp(sc, bf, 0);
4004 * Handle completion of non-aggregate session frames.
4006 * This (currently) doesn't implement software retransmission of
4007 * non-aggregate frames!
4009 * Software retransmission of non-aggregate frames needs to obey
4010 * the strict sequence number ordering, and drop any frames that
4013 * For now, filtered frames and frame transmission will cause
4014 * all kinds of issues. So we don't support them.
4016 * So anyone queuing frames via ath_tx_normal_xmit() or
4017 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4020 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4022 struct ieee80211_node *ni = bf->bf_node;
4023 struct ath_node *an = ATH_NODE(ni);
4024 int tid = bf->bf_state.bfs_tid;
4025 struct ath_tid *atid = &an->an_tid[tid];
4026 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4028 /* The TID state is protected behind the TXQ lock */
4031 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4032 __func__, bf, fail, atid->hwq_depth - 1);
4038 * If the frame was filtered, stick it on the filter frame
4039 * queue and complain about it. It shouldn't happen!
4041 if ((ts->ts_status & HAL_TXERR_FILT) ||
4042 (ts->ts_status != 0 && atid->isfiltered)) {
4043 DPRINTF(sc, ATH_DEBUG_SW_TX,
4044 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4048 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4051 if (atid->isfiltered)
4052 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4053 if (atid->hwq_depth < 0)
4054 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4055 __func__, atid->hwq_depth);
4058 * If the queue is filtered, potentially mark it as complete
4059 * and reschedule it as needed.
4061 * This is required as there may be a subsequent TX descriptor
4062 * for this end-node that has CLRDMASK set, so it's quite possible
4063 * that a filtered frame will be followed by a non-filtered
4064 * (complete or otherwise) frame.
4066 * XXX should we do this before we complete the frame?
4068 if (atid->isfiltered)
4069 ath_tx_tid_filt_comp_complete(sc, atid);
4073 * punt to rate control if we're not being cleaned up
4074 * during a hw queue drain and the frame wanted an ACK.
4076 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4077 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4078 ts, bf->bf_state.bfs_pktlen,
4079 1, (ts->ts_status == 0) ? 0 : 1);
4081 ath_tx_default_comp(sc, bf, fail);
4085 * Handle cleanup of aggregate session packets that aren't
4088 * There's no need to update the BAW here - the session is being
4092 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4094 struct ieee80211_node *ni = bf->bf_node;
4095 struct ath_node *an = ATH_NODE(ni);
4096 int tid = bf->bf_state.bfs_tid;
4097 struct ath_tid *atid = &an->an_tid[tid];
4099 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4100 __func__, tid, atid->incomp);
4104 if (atid->incomp == 0) {
4105 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4106 "%s: TID %d: cleaned up! resume!\n",
4108 atid->cleanup_inprogress = 0;
4109 ath_tx_tid_resume(sc, atid);
4113 ath_tx_default_comp(sc, bf, 0);
4117 * Performs transmit side cleanup when TID changes from aggregated to
4120 * - Discard all retry frames from the s/w queue.
4121 * - Fix the tx completion function for all buffers in s/w queue.
4122 * - Count the number of unacked frames, and let transmit completion
4125 * The caller is responsible for pausing the TID and unpausing the
4126 * TID if no cleanup was required. Otherwise the cleanup path will
4127 * unpause the TID once the last hardware queued frame is completed.
4130 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4133 struct ath_tid *atid = &an->an_tid[tid];
4134 struct ieee80211_tx_ampdu *tap;
4135 struct ath_buf *bf, *bf_next;
4137 ATH_TX_LOCK_ASSERT(sc);
4139 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4140 "%s: TID %d: called\n", __func__, tid);
4143 * Move the filtered frames to the TX queue, before
4144 * we run off and discard/process things.
4146 /* XXX this is really quite inefficient */
4147 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4148 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4149 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4153 * Update the frames in the software TX queue:
4155 * + Discard retry frames in the queue
4156 * + Fix the completion function to be non-aggregate
4158 bf = ATH_TID_FIRST(atid);
4160 if (bf->bf_state.bfs_isretried) {
4161 bf_next = TAILQ_NEXT(bf, bf_list);
4162 ATH_TID_REMOVE(atid, bf, bf_list);
4163 if (bf->bf_state.bfs_dobaw) {
4164 ath_tx_update_baw(sc, an, atid, bf);
4165 if (!bf->bf_state.bfs_addedbaw)
4166 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4167 "%s: wasn't added: seqno %d\n",
4169 SEQNO(bf->bf_state.bfs_seqno));
4171 bf->bf_state.bfs_dobaw = 0;
4173 * Call the default completion handler with "fail" just
4174 * so upper levels are suitably notified about this.
4176 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4180 /* Give these the default completion handler */
4181 bf->bf_comp = ath_tx_normal_comp;
4182 bf = TAILQ_NEXT(bf, bf_list);
4186 * Calculate what hardware-queued frames exist based
4187 * on the current BAW size. Ie, what frames have been
4188 * added to the TX hardware queue for this TID but
4191 tap = ath_tx_get_tx_tid(an, tid);
4192 /* Need the lock - fiddling with BAW */
4193 while (atid->baw_head != atid->baw_tail) {
4194 if (atid->tx_buf[atid->baw_head]) {
4196 atid->cleanup_inprogress = 1;
4197 atid->tx_buf[atid->baw_head] = NULL;
4199 INCR(atid->baw_head, ATH_TID_MAX_BUFS);
4200 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
4203 if (atid->cleanup_inprogress)
4204 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4205 "%s: TID %d: cleanup needed: %d packets\n",
4206 __func__, tid, atid->incomp);
4208 /* Owner now must free completed frames */
4211 static struct ath_buf *
4212 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4213 struct ath_tid *tid, struct ath_buf *bf)
4215 struct ath_buf *nbf;
4219 * Clone the buffer. This will handle the dma unmap and
4220 * copy the node reference to the new buffer. If this
4221 * works out, 'bf' will have no DMA mapping, no mbuf
4222 * pointer and no node reference.
4224 nbf = ath_buf_clone(sc, bf);
4227 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4232 /* Failed to clone */
4233 DPRINTF(sc, ATH_DEBUG_XMIT,
4234 "%s: failed to clone a busy buffer\n",
4239 /* Setup the dma for the new buffer */
4240 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4242 DPRINTF(sc, ATH_DEBUG_XMIT,
4243 "%s: failed to setup dma for clone\n",
4246 * Put this at the head of the list, not tail;
4247 * that way it doesn't interfere with the
4248 * busy buffer logic (which uses the tail of
4252 ath_returnbuf_head(sc, nbf);
4253 ATH_TXBUF_UNLOCK(sc);
4257 /* Update BAW if required, before we free the original buf */
4258 if (bf->bf_state.bfs_dobaw)
4259 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4261 /* Free original buffer; return new buffer */
4262 ath_freebuf(sc, bf);
4268 * Handle retrying an unaggregate frame in an aggregate
4271 * If too many retries occur, pause the TID, wait for
4272 * any further retransmits (as there's no reason why
4273 * non-aggregate frames in an aggregate session are
4274 * transmitted in-order; they just have to be in-BAW)
4275 * and then queue a BAR.
4278 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4280 struct ieee80211_node *ni = bf->bf_node;
4281 struct ath_node *an = ATH_NODE(ni);
4282 int tid = bf->bf_state.bfs_tid;
4283 struct ath_tid *atid = &an->an_tid[tid];
4284 struct ieee80211_tx_ampdu *tap;
4288 tap = ath_tx_get_tx_tid(an, tid);
4291 * If the buffer is marked as busy, we can't directly
4292 * reuse it. Instead, try to clone the buffer.
4293 * If the clone is successful, recycle the old buffer.
4294 * If the clone is unsuccessful, set bfs_retries to max
4295 * to force the next bit of code to free the buffer
4298 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4299 (bf->bf_flags & ATH_BUF_BUSY)) {
4300 struct ath_buf *nbf;
4301 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4303 /* bf has been freed at this point */
4306 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4309 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4310 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4311 "%s: exceeded retries; seqno %d\n",
4312 __func__, SEQNO(bf->bf_state.bfs_seqno));
4313 sc->sc_stats.ast_tx_swretrymax++;
4315 /* Update BAW anyway */
4316 if (bf->bf_state.bfs_dobaw) {
4317 ath_tx_update_baw(sc, an, atid, bf);
4318 if (! bf->bf_state.bfs_addedbaw)
4319 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4320 "%s: wasn't added: seqno %d\n",
4321 __func__, SEQNO(bf->bf_state.bfs_seqno));
4323 bf->bf_state.bfs_dobaw = 0;
4325 /* Suspend the TX queue and get ready to send the BAR */
4326 ath_tx_tid_bar_suspend(sc, atid);
4328 /* Send the BAR if there are no other frames waiting */
4329 if (ath_tx_tid_bar_tx_ready(sc, atid))
4330 ath_tx_tid_bar_tx(sc, atid);
4334 /* Free buffer, bf is free after this call */
4335 ath_tx_default_comp(sc, bf, 0);
4340 * This increments the retry counter as well as
4341 * sets the retry flag in the ath_buf and packet
4344 ath_tx_set_retry(sc, bf);
4345 sc->sc_stats.ast_tx_swretries++;
4348 * Insert this at the head of the queue, so it's
4349 * retried before any current/subsequent frames.
4351 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4352 ath_tx_tid_sched(sc, atid);
4353 /* Send the BAR if there are no other frames waiting */
4354 if (ath_tx_tid_bar_tx_ready(sc, atid))
4355 ath_tx_tid_bar_tx(sc, atid);
4361 * Common code for aggregate excessive retry/subframe retry.
4362 * If retrying, queues buffers to bf_q. If not, frees the
4365 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4368 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4371 struct ieee80211_node *ni = bf->bf_node;
4372 struct ath_node *an = ATH_NODE(ni);
4373 int tid = bf->bf_state.bfs_tid;
4374 struct ath_tid *atid = &an->an_tid[tid];
4376 ATH_TX_LOCK_ASSERT(sc);
4378 /* XXX clr11naggr should be done for all subframes */
4379 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4380 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4382 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4385 * If the buffer is marked as busy, we can't directly
4386 * reuse it. Instead, try to clone the buffer.
4387 * If the clone is successful, recycle the old buffer.
4388 * If the clone is unsuccessful, set bfs_retries to max
4389 * to force the next bit of code to free the buffer
4392 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4393 (bf->bf_flags & ATH_BUF_BUSY)) {
4394 struct ath_buf *nbf;
4395 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4397 /* bf has been freed at this point */
4400 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4403 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4404 sc->sc_stats.ast_tx_swretrymax++;
4405 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4406 "%s: max retries: seqno %d\n",
4407 __func__, SEQNO(bf->bf_state.bfs_seqno));
4408 ath_tx_update_baw(sc, an, atid, bf);
4409 if (!bf->bf_state.bfs_addedbaw)
4410 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4411 "%s: wasn't added: seqno %d\n",
4412 __func__, SEQNO(bf->bf_state.bfs_seqno));
4413 bf->bf_state.bfs_dobaw = 0;
4417 ath_tx_set_retry(sc, bf);
4418 sc->sc_stats.ast_tx_swretries++;
4419 bf->bf_next = NULL; /* Just to make sure */
4421 /* Clear the aggregate state */
4422 bf->bf_state.bfs_aggr = 0;
4423 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4424 bf->bf_state.bfs_nframes = 1;
4426 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4431 * error pkt completion for an aggregate destination
4434 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4435 struct ath_tid *tid)
4437 struct ieee80211_node *ni = bf_first->bf_node;
4438 struct ath_node *an = ATH_NODE(ni);
4439 struct ath_buf *bf_next, *bf;
4442 struct ieee80211_tx_ampdu *tap;
4449 * Update rate control - all frames have failed.
4451 * XXX use the length in the first frame in the series;
4452 * XXX just so things are consistent for now.
4454 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4455 &bf_first->bf_status.ds_txstat,
4456 bf_first->bf_state.bfs_pktlen,
4457 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4460 tap = ath_tx_get_tx_tid(an, tid->tid);
4461 sc->sc_stats.ast_tx_aggr_failall++;
4463 /* Retry all subframes */
4466 bf_next = bf->bf_next;
4467 bf->bf_next = NULL; /* Remove it from the aggr list */
4468 sc->sc_stats.ast_tx_aggr_fail++;
4469 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4472 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4477 /* Prepend all frames to the beginning of the queue */
4478 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4479 TAILQ_REMOVE(&bf_q, bf, bf_list);
4480 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4484 * Schedule the TID to be re-tried.
4486 ath_tx_tid_sched(sc, tid);
4489 * send bar if we dropped any frames
4491 * Keep the txq lock held for now, as we need to ensure
4492 * that ni_txseqs[] is consistent (as it's being updated
4493 * in the ifnet TX context or raw TX context.)
4496 /* Suspend the TX queue and get ready to send the BAR */
4497 ath_tx_tid_bar_suspend(sc, tid);
4501 * Send BAR if required
4503 if (ath_tx_tid_bar_tx_ready(sc, tid))
4504 ath_tx_tid_bar_tx(sc, tid);
4508 /* Complete frames which errored out */
4509 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4510 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4511 ath_tx_default_comp(sc, bf, 0);
4516 * Handle clean-up of packets from an aggregate list.
4518 * There's no need to update the BAW here - the session is being
4522 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4524 struct ath_buf *bf, *bf_next;
4525 struct ieee80211_node *ni = bf_first->bf_node;
4526 struct ath_node *an = ATH_NODE(ni);
4527 int tid = bf_first->bf_state.bfs_tid;
4528 struct ath_tid *atid = &an->an_tid[tid];
4539 if (atid->incomp == 0) {
4540 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4541 "%s: TID %d: cleaned up! resume!\n",
4543 atid->cleanup_inprogress = 0;
4544 ath_tx_tid_resume(sc, atid);
4547 /* Send BAR if required */
4548 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4550 * XXX TODO: we should likely just tear down the BAR state here,
4551 * rather than sending a BAR.
4553 if (ath_tx_tid_bar_tx_ready(sc, atid))
4554 ath_tx_tid_bar_tx(sc, atid);
4558 /* Handle frame completion */
4561 bf_next = bf->bf_next;
4562 ath_tx_default_comp(sc, bf, 1);
4568 * Handle completion of an set of aggregate frames.
4570 * Note: the completion handler is the last descriptor in the aggregate,
4571 * not the last descriptor in the first frame.
4574 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4577 //struct ath_desc *ds = bf->bf_lastds;
4578 struct ieee80211_node *ni = bf_first->bf_node;
4579 struct ath_node *an = ATH_NODE(ni);
4580 int tid = bf_first->bf_state.bfs_tid;
4581 struct ath_tid *atid = &an->an_tid[tid];
4582 struct ath_tx_status ts;
4583 struct ieee80211_tx_ampdu *tap;
4589 struct ath_buf *bf, *bf_next;
4592 int nframes = 0, nbad = 0, nf;
4594 /* XXX there's too much on the stack? */
4595 struct ath_rc_series rc[ATH_RC_NUM];
4598 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4599 __func__, atid->hwq_depth);
4602 * Take a copy; this may be needed -after- bf_first
4603 * has been completed and freed.
4605 ts = bf_first->bf_status.ds_txstat;
4610 /* The TID state is kept behind the TXQ lock */
4614 if (atid->hwq_depth < 0)
4615 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4616 __func__, atid->hwq_depth);
4619 * If the TID is filtered, handle completing the filter
4620 * transition before potentially kicking it to the cleanup
4623 * XXX this is duplicate work, ew.
4625 if (atid->isfiltered)
4626 ath_tx_tid_filt_comp_complete(sc, atid);
4629 * Punt cleanup to the relevant function, not our problem now
4631 if (atid->cleanup_inprogress) {
4632 if (atid->isfiltered)
4633 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4634 "%s: isfiltered=1, normal_comp?\n",
4637 ath_tx_comp_cleanup_aggr(sc, bf_first);
4642 * If the frame is filtered, transition to filtered frame
4643 * mode and add this to the filtered frame list.
4645 * XXX TODO: figure out how this interoperates with
4646 * BAR, pause and cleanup states.
4648 if ((ts.ts_status & HAL_TXERR_FILT) ||
4649 (ts.ts_status != 0 && atid->isfiltered)) {
4651 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4652 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4653 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4655 /* Remove from BAW */
4656 TAILQ_FOREACH(bf, &bf_cq, bf_list) {
4657 if (bf->bf_state.bfs_addedbaw)
4659 if (bf->bf_state.bfs_dobaw) {
4660 ath_tx_update_baw(sc, an, atid, bf);
4661 if (!bf->bf_state.bfs_addedbaw)
4662 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4663 "%s: wasn't added: seqno %d\n",
4665 SEQNO(bf->bf_state.bfs_seqno));
4667 bf->bf_state.bfs_dobaw = 0;
4670 * If any intermediate frames in the BAW were dropped when
4671 * handling filtering things, send a BAR.
4674 ath_tx_tid_bar_suspend(sc, atid);
4677 * Finish up by sending a BAR if required and freeing
4678 * the frames outside of the TX lock.
4680 goto finish_send_bar;
4684 * XXX for now, use the first frame in the aggregate for
4685 * XXX rate control completion; it's at least consistent.
4687 pktlen = bf_first->bf_state.bfs_pktlen;
4690 * Handle errors first!
4692 * Here, handle _any_ error as a "exceeded retries" error.
4693 * Later on (when filtered frames are to be specially handled)
4694 * it'll have to be expanded.
4697 if (ts.ts_status & HAL_TXERR_XRETRY) {
4699 if (ts.ts_status != 0) {
4701 ath_tx_comp_aggr_error(sc, bf_first, atid);
4705 tap = ath_tx_get_tx_tid(an, tid);
4708 * extract starting sequence and block-ack bitmap
4710 /* XXX endian-ness of seq_st, ba? */
4711 seq_st = ts.ts_seqnum;
4712 hasba = !! (ts.ts_flags & HAL_TX_BA);
4713 tx_ok = (ts.ts_status == 0);
4714 isaggr = bf_first->bf_state.bfs_aggr;
4715 ba[0] = ts.ts_ba_low;
4716 ba[1] = ts.ts_ba_high;
4719 * Copy the TX completion status and the rate control
4720 * series from the first descriptor, as it may be freed
4721 * before the rate control code can get its grubby fingers
4724 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4726 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4727 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4728 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4729 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4730 isaggr, seq_st, hasba, ba[0], ba[1]);
4733 * The reference driver doesn't do this; it simply ignores
4734 * this check in its entirety.
4736 * I've seen this occur when using iperf to send traffic
4737 * out tid 1 - the aggregate frames are all marked as TID 1,
4738 * but the TXSTATUS has TID=0. So, let's just ignore this
4742 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4743 if (tid != ts.ts_tid) {
4744 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4745 __func__, tid, ts.ts_tid);
4750 /* AR5416 BA bug; this requires an interface reset */
4751 if (isaggr && tx_ok && (! hasba)) {
4752 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4753 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
4755 __func__, hasba, tx_ok, isaggr, seq_st);
4756 /* XXX TODO: schedule an interface reset */
4758 ath_printtxbuf(sc, bf_first,
4759 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
4764 * Walk the list of frames, figure out which ones were correctly
4765 * sent and which weren't.
4768 nf = bf_first->bf_state.bfs_nframes;
4770 /* bf_first is going to be invalid once this list is walked */
4774 * Walk the list of completed frames and determine
4775 * which need to be completed and which need to be
4778 * For completed frames, the completion functions need
4779 * to be called at the end of this function as the last
4780 * node reference may free the node.
4782 * Finally, since the TXQ lock can't be held during the
4783 * completion callback (to avoid lock recursion),
4784 * the completion calls have to be done outside of the
4789 ba_index = ATH_BA_INDEX(seq_st,
4790 SEQNO(bf->bf_state.bfs_seqno));
4791 bf_next = bf->bf_next;
4792 bf->bf_next = NULL; /* Remove it from the aggr list */
4794 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4795 "%s: checking bf=%p seqno=%d; ack=%d\n",
4796 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
4797 ATH_BA_ISSET(ba, ba_index));
4799 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
4800 sc->sc_stats.ast_tx_aggr_ok++;
4801 ath_tx_update_baw(sc, an, atid, bf);
4802 bf->bf_state.bfs_dobaw = 0;
4803 if (!bf->bf_state.bfs_addedbaw)
4804 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4805 "%s: wasn't added: seqno %d\n",
4806 __func__, SEQNO(bf->bf_state.bfs_seqno));
4808 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4810 sc->sc_stats.ast_tx_aggr_fail++;
4811 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4814 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4822 * Now that the BAW updates have been done, unlock
4824 * txseq is grabbed before the lock is released so we
4825 * have a consistent view of what -was- in the BAW.
4826 * Anything after this point will not yet have been
4829 txseq = tap->txa_start;
4833 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4834 "%s: num frames seen=%d; bf nframes=%d\n",
4835 __func__, nframes, nf);
4838 * Now we know how many frames were bad, call the rate
4842 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
4846 * send bar if we dropped any frames
4849 /* Suspend the TX queue and get ready to send the BAR */
4851 ath_tx_tid_bar_suspend(sc, atid);
4855 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4856 "%s: txa_start now %d\n", __func__, tap->txa_start);
4860 /* Prepend all frames to the beginning of the queue */
4861 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4862 TAILQ_REMOVE(&bf_q, bf, bf_list);
4863 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4867 * Reschedule to grab some further frames.
4869 ath_tx_tid_sched(sc, atid);
4872 * If the queue is filtered, re-schedule as required.
4874 * This is required as there may be a subsequent TX descriptor
4875 * for this end-node that has CLRDMASK set, so it's quite possible
4876 * that a filtered frame will be followed by a non-filtered
4877 * (complete or otherwise) frame.
4879 * XXX should we do this before we complete the frame?
4881 if (atid->isfiltered)
4882 ath_tx_tid_filt_comp_complete(sc, atid);
4887 * Send BAR if required
4889 if (ath_tx_tid_bar_tx_ready(sc, atid))
4890 ath_tx_tid_bar_tx(sc, atid);
4894 /* Do deferred completion */
4895 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4896 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4897 ath_tx_default_comp(sc, bf, 0);
4902 * Handle completion of unaggregated frames in an ADDBA
4905 * Fail is set to 1 if the entry is being freed via a call to
4906 * ath_tx_draintxq().
4909 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
4911 struct ieee80211_node *ni = bf->bf_node;
4912 struct ath_node *an = ATH_NODE(ni);
4913 int tid = bf->bf_state.bfs_tid;
4914 struct ath_tid *atid = &an->an_tid[tid];
4915 struct ath_tx_status ts;
4919 * Take a copy of this; filtering/cloning the frame may free the
4922 ts = bf->bf_status.ds_txstat;
4925 * Update rate control status here, before we possibly
4926 * punt to retry or cleanup.
4928 * Do it outside of the TXQ lock.
4930 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4931 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4932 &bf->bf_status.ds_txstat,
4933 bf->bf_state.bfs_pktlen,
4934 1, (ts.ts_status == 0) ? 0 : 1);
4937 * This is called early so atid->hwq_depth can be tracked.
4938 * This unfortunately means that it's released and regrabbed
4939 * during retry and cleanup. That's rather inefficient.
4943 if (tid == IEEE80211_NONQOS_TID)
4944 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
4946 DPRINTF(sc, ATH_DEBUG_SW_TX,
4947 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
4948 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
4949 SEQNO(bf->bf_state.bfs_seqno));
4952 if (atid->hwq_depth < 0)
4953 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4954 __func__, atid->hwq_depth);
4957 * If the TID is filtered, handle completing the filter
4958 * transition before potentially kicking it to the cleanup
4961 if (atid->isfiltered)
4962 ath_tx_tid_filt_comp_complete(sc, atid);
4965 * If a cleanup is in progress, punt to comp_cleanup;
4966 * rather than handling it here. It's thus their
4967 * responsibility to clean up, call the completion
4968 * function in net80211, etc.
4970 if (atid->cleanup_inprogress) {
4971 if (atid->isfiltered)
4972 DPRINTF(sc, ATH_DEBUG_SW_TX,
4973 "%s: isfiltered=1, normal_comp?\n",
4976 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
4978 ath_tx_comp_cleanup_unaggr(sc, bf);
4983 * XXX TODO: how does cleanup, BAR and filtered frame handling
4986 * If the frame is filtered OR if it's any failure but
4987 * the TID is filtered, the frame must be added to the
4988 * filtered frame list.
4990 * However - a busy buffer can't be added to the filtered
4991 * list as it will end up being recycled without having
4992 * been made available for the hardware.
4994 if ((ts.ts_status & HAL_TXERR_FILT) ||
4995 (ts.ts_status != 0 && atid->isfiltered)) {
4999 DPRINTF(sc, ATH_DEBUG_SW_TX,
5000 "%s: isfiltered=1, fail=%d\n",
5002 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5004 /* Remove from BAW */
5005 if (bf->bf_state.bfs_addedbaw)
5007 if (bf->bf_state.bfs_dobaw) {
5008 ath_tx_update_baw(sc, an, atid, bf);
5009 if (!bf->bf_state.bfs_addedbaw)
5010 DPRINTF(sc, ATH_DEBUG_SW_TX,
5011 "%s: wasn't added: seqno %d\n",
5012 __func__, SEQNO(bf->bf_state.bfs_seqno));
5014 bf->bf_state.bfs_dobaw = 0;
5018 * If the frame couldn't be filtered, treat it as a drop and
5019 * prepare to send a BAR.
5021 if (freeframe && drops)
5022 ath_tx_tid_bar_suspend(sc, atid);
5025 * Send BAR if required
5027 if (ath_tx_tid_bar_tx_ready(sc, atid))
5028 ath_tx_tid_bar_tx(sc, atid);
5032 * If freeframe is set, then the frame couldn't be
5033 * cloned and bf is still valid. Just complete/free it.
5036 ath_tx_default_comp(sc, bf, fail);
5042 * Don't bother with the retry check if all frames
5043 * are being failed (eg during queue deletion.)
5046 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5048 if (fail == 0 && ts.ts_status != 0) {
5050 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5052 ath_tx_aggr_retry_unaggr(sc, bf);
5056 /* Success? Complete */
5057 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5058 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5059 if (bf->bf_state.bfs_dobaw) {
5060 ath_tx_update_baw(sc, an, atid, bf);
5061 bf->bf_state.bfs_dobaw = 0;
5062 if (!bf->bf_state.bfs_addedbaw)
5063 DPRINTF(sc, ATH_DEBUG_SW_TX,
5064 "%s: wasn't added: seqno %d\n",
5065 __func__, SEQNO(bf->bf_state.bfs_seqno));
5069 * If the queue is filtered, re-schedule as required.
5071 * This is required as there may be a subsequent TX descriptor
5072 * for this end-node that has CLRDMASK set, so it's quite possible
5073 * that a filtered frame will be followed by a non-filtered
5074 * (complete or otherwise) frame.
5076 * XXX should we do this before we complete the frame?
5078 if (atid->isfiltered)
5079 ath_tx_tid_filt_comp_complete(sc, atid);
5082 * Send BAR if required
5084 if (ath_tx_tid_bar_tx_ready(sc, atid))
5085 ath_tx_tid_bar_tx(sc, atid);
5089 ath_tx_default_comp(sc, bf, fail);
5090 /* bf is freed at this point */
5094 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5096 if (bf->bf_state.bfs_aggr)
5097 ath_tx_aggr_comp_aggr(sc, bf, fail);
5099 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5103 * Schedule some packets from the given node/TID to the hardware.
5105 * This is the aggregate version.
5108 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5109 struct ath_tid *tid)
5112 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5113 struct ieee80211_tx_ampdu *tap;
5114 ATH_AGGR_STATUS status;
5117 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5118 ATH_TX_LOCK_ASSERT(sc);
5121 * XXX TODO: If we're called for a queue that we're leaking frames to,
5122 * ensure we only leak one.
5125 tap = ath_tx_get_tx_tid(an, tid->tid);
5127 if (tid->tid == IEEE80211_NONQOS_TID)
5128 DPRINTF(sc, ATH_DEBUG_SW_TX,
5129 "%s: called for TID=NONQOS_TID?\n", __func__);
5132 status = ATH_AGGR_DONE;
5135 * If the upper layer has paused the TID, don't
5136 * queue any further packets.
5138 * This can also occur from the completion task because
5139 * of packet loss; but as its serialised with this code,
5140 * it won't "appear" half way through queuing packets.
5142 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5145 bf = ATH_TID_FIRST(tid);
5151 * If the packet doesn't fall within the BAW (eg a NULL
5152 * data frame), schedule it directly; continue.
5154 if (! bf->bf_state.bfs_dobaw) {
5155 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5156 "%s: non-baw packet\n",
5158 ATH_TID_REMOVE(tid, bf, bf_list);
5160 if (bf->bf_state.bfs_nframes > 1)
5161 DPRINTF(sc, ATH_DEBUG_SW_TX,
5162 "%s: aggr=%d, nframes=%d\n",
5164 bf->bf_state.bfs_aggr,
5165 bf->bf_state.bfs_nframes);
5168 * This shouldn't happen - such frames shouldn't
5169 * ever have been queued as an aggregate in the
5170 * first place. However, make sure the fields
5171 * are correctly setup just to be totally sure.
5173 bf->bf_state.bfs_aggr = 0;
5174 bf->bf_state.bfs_nframes = 1;
5176 /* Update CLRDMASK just before this frame is queued */
5177 ath_tx_update_clrdmask(sc, tid, bf);
5179 ath_tx_do_ratelookup(sc, bf);
5180 ath_tx_calc_duration(sc, bf);
5181 ath_tx_calc_protection(sc, bf);
5182 ath_tx_set_rtscts(sc, bf);
5183 ath_tx_rate_fill_rcflags(sc, bf);
5184 ath_tx_setds(sc, bf);
5185 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5187 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5189 /* Queue the packet; continue */
5196 * Do a rate control lookup on the first frame in the
5197 * list. The rate control code needs that to occur
5198 * before it can determine whether to TX.
5199 * It's inaccurate because the rate control code doesn't
5200 * really "do" aggregate lookups, so it only considers
5201 * the size of the first frame.
5203 ath_tx_do_ratelookup(sc, bf);
5204 bf->bf_state.bfs_rc[3].rix = 0;
5205 bf->bf_state.bfs_rc[3].tries = 0;
5207 ath_tx_calc_duration(sc, bf);
5208 ath_tx_calc_protection(sc, bf);
5210 ath_tx_set_rtscts(sc, bf);
5211 ath_tx_rate_fill_rcflags(sc, bf);
5213 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5215 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5216 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5219 * No frames to be picked up - out of BAW
5221 if (TAILQ_EMPTY(&bf_q))
5225 * This assumes that the descriptor list in the ath_bufhead
5226 * are already linked together via bf_next pointers.
5228 bf = TAILQ_FIRST(&bf_q);
5230 if (status == ATH_AGGR_8K_LIMITED)
5231 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5234 * If it's the only frame send as non-aggregate
5235 * assume that ath_tx_form_aggr() has checked
5236 * whether it's in the BAW and added it appropriately.
5238 if (bf->bf_state.bfs_nframes == 1) {
5239 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5240 "%s: single-frame aggregate\n", __func__);
5242 /* Update CLRDMASK just before this frame is queued */
5243 ath_tx_update_clrdmask(sc, tid, bf);
5245 bf->bf_state.bfs_aggr = 0;
5246 bf->bf_state.bfs_ndelim = 0;
5247 ath_tx_setds(sc, bf);
5248 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5249 if (status == ATH_AGGR_BAW_CLOSED)
5250 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5252 sc->sc_aggr_stats.aggr_single_pkt++;
5254 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5255 "%s: multi-frame aggregate: %d frames, "
5257 __func__, bf->bf_state.bfs_nframes,
5258 bf->bf_state.bfs_al);
5259 bf->bf_state.bfs_aggr = 1;
5260 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5261 sc->sc_aggr_stats.aggr_aggr_pkt++;
5263 /* Update CLRDMASK just before this frame is queued */
5264 ath_tx_update_clrdmask(sc, tid, bf);
5267 * Calculate the duration/protection as required.
5269 ath_tx_calc_duration(sc, bf);
5270 ath_tx_calc_protection(sc, bf);
5273 * Update the rate and rtscts information based on the
5274 * rate decision made by the rate control code;
5275 * the first frame in the aggregate needs it.
5277 ath_tx_set_rtscts(sc, bf);
5280 * Setup the relevant descriptor fields
5281 * for aggregation. The first descriptor
5282 * already points to the rest in the chain.
5284 ath_tx_setds_11n(sc, bf);
5288 /* Set completion handler, multi-frame aggregate or not */
5289 bf->bf_comp = ath_tx_aggr_comp;
5291 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5292 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5295 * Update leak count and frame config if were leaking frames.
5297 * XXX TODO: it should update all frames in an aggregate
5300 ath_tx_leak_count_update(sc, tid, bf);
5303 ath_tx_handoff(sc, txq, bf);
5305 /* Track outstanding buffer count to hardware */
5306 /* aggregates are "one" buffer */
5310 * Break out if ath_tx_form_aggr() indicated
5311 * there can't be any further progress (eg BAW is full.)
5312 * Checking for an empty txq is done above.
5314 * XXX locking on txq here?
5316 /* XXX TXQ locking */
5317 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5318 (status == ATH_AGGR_BAW_CLOSED ||
5319 status == ATH_AGGR_LEAK_CLOSED))
5325 * Schedule some packets from the given node/TID to the hardware.
5327 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5328 * It just dumps frames into the TXQ. We should limit how deep
5329 * the transmit queue can grow for frames dispatched to the given
5332 * To avoid locking issues, either we need to own the TXQ lock
5333 * at this point, or we need to pass in the maximum frame count
5337 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5338 struct ath_tid *tid)
5341 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5343 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5344 __func__, an, tid->tid);
5346 ATH_TX_LOCK_ASSERT(sc);
5348 /* Check - is AMPDU pending or running? then print out something */
5349 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5350 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5351 __func__, tid->tid);
5352 if (ath_tx_ampdu_running(sc, an, tid->tid))
5353 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5354 __func__, tid->tid);
5359 * If the upper layers have paused the TID, don't
5360 * queue any further packets.
5362 * XXX if we are leaking frames, make sure we decrement
5363 * that counter _and_ we continue here.
5365 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5368 bf = ATH_TID_FIRST(tid);
5373 ATH_TID_REMOVE(tid, bf, bf_list);
5376 if (tid->tid != bf->bf_state.bfs_tid) {
5377 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5378 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5381 /* Normal completion handler */
5382 bf->bf_comp = ath_tx_normal_comp;
5385 * Override this for now, until the non-aggregate
5386 * completion handler correctly handles software retransmits.
5388 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5390 /* Update CLRDMASK just before this frame is queued */
5391 ath_tx_update_clrdmask(sc, tid, bf);
5393 /* Program descriptors + rate control */
5394 ath_tx_do_ratelookup(sc, bf);
5395 ath_tx_calc_duration(sc, bf);
5396 ath_tx_calc_protection(sc, bf);
5397 ath_tx_set_rtscts(sc, bf);
5398 ath_tx_rate_fill_rcflags(sc, bf);
5399 ath_tx_setds(sc, bf);
5402 * Update the current leak count if
5403 * we're leaking frames; and set the
5404 * MORE flag as appropriate.
5406 ath_tx_leak_count_update(sc, tid, bf);
5408 /* Track outstanding buffer count to hardware */
5409 /* aggregates are "one" buffer */
5412 /* Punt to hardware or software txq */
5413 ath_tx_handoff(sc, txq, bf);
5418 * Schedule some packets to the given hardware queue.
5420 * This function walks the list of TIDs (ie, ath_node TIDs
5421 * with queued traffic) and attempts to schedule traffic
5424 * TID scheduling is implemented as a FIFO, with TIDs being
5425 * added to the end of the queue after some frames have been
5429 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5431 struct ath_tid *tid, *last;
5433 ATH_TX_LOCK_ASSERT(sc);
5436 * Don't schedule if the hardware queue is busy.
5437 * This (hopefully) gives some more time to aggregate
5438 * some packets in the aggregation queue.
5440 * XXX It doesn't stop a parallel sender from sneaking
5441 * in transmitting a frame!
5443 /* XXX TXQ locking */
5444 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5445 sc->sc_aggr_stats.aggr_sched_nopkt++;
5448 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5449 sc->sc_aggr_stats.aggr_sched_nopkt++;
5453 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5455 while ((tid = TAILQ_FIRST(&txq->axq_tidq)) != NULL) {
5457 * Suspend paused queues here; they'll be resumed
5458 * once the addba completes or times out.
5460 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5461 __func__, tid->tid, tid->paused);
5462 ath_tx_tid_unsched(sc, tid);
5464 * This node may be in power-save and we're leaking
5465 * a frame; be careful.
5467 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5472 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5473 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5475 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5477 /* Not empty? Re-schedule */
5478 if (tid->axq_depth != 0)
5479 ath_tx_tid_sched(sc, tid);
5482 * Give the software queue time to aggregate more
5483 * packets. If we aren't running aggregation then
5484 * we should still limit the hardware queue depth.
5486 /* XXX TXQ locking */
5487 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5490 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5495 * If this was the last entry on the original list, stop.
5496 * Otherwise nodes that have been rescheduled onto the end
5497 * of the TID FIFO list will just keep being rescheduled.
5499 * XXX What should we do about nodes that were paused
5500 * but are pending a leaking frame in response to a ps-poll?
5501 * They'll be put at the front of the list; so they'll
5502 * prematurely trigger this condition! Ew.
5514 * Return net80211 TID struct pointer, or NULL for none
5516 struct ieee80211_tx_ampdu *
5517 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5519 struct ieee80211_node *ni = &an->an_node;
5520 struct ieee80211_tx_ampdu *tap;
5522 if (tid == IEEE80211_NONQOS_TID)
5525 tap = &ni->ni_tx_ampdu[tid];
5530 * Is AMPDU-TX running?
5533 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5535 struct ieee80211_tx_ampdu *tap;
5537 if (tid == IEEE80211_NONQOS_TID)
5540 tap = ath_tx_get_tx_tid(an, tid);
5542 return 0; /* Not valid; default to not running */
5544 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5548 * Is AMPDU-TX negotiation pending?
5551 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5553 struct ieee80211_tx_ampdu *tap;
5555 if (tid == IEEE80211_NONQOS_TID)
5558 tap = ath_tx_get_tx_tid(an, tid);
5560 return 0; /* Not valid; default to not pending */
5562 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5566 * Is AMPDU-TX pending for the given TID?
5571 * Method to handle sending an ADDBA request.
5573 * We tap this so the relevant flags can be set to pause the TID
5574 * whilst waiting for the response.
5576 * XXX there's no timeout handler we can override?
5579 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5580 int dialogtoken, int baparamset, int batimeout)
5582 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5583 int tid = tap->txa_ac;
5584 struct ath_node *an = ATH_NODE(ni);
5585 struct ath_tid *atid = &an->an_tid[tid];
5588 * XXX danger Will Robinson!
5590 * Although the taskqueue may be running and scheduling some more
5591 * packets, these should all be _before_ the addba sequence number.
5592 * However, net80211 will keep self-assigning sequence numbers
5593 * until addba has been negotiated.
5595 * In the past, these packets would be "paused" (which still works
5596 * fine, as they're being scheduled to the driver in the same
5597 * serialised method which is calling the addba request routine)
5598 * and when the aggregation session begins, they'll be dequeued
5599 * as aggregate packets and added to the BAW. However, now there's
5600 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5601 * packets. Thus they never get included in the BAW tracking and
5602 * this can cause the initial burst of packets after the addba
5603 * negotiation to "hang", as they quickly fall outside the BAW.
5605 * The "eventual" solution should be to tag these packets with
5606 * dobaw. Although net80211 has given us a sequence number,
5607 * it'll be "after" the left edge of the BAW and thus it'll
5612 * This is a bit annoying. Until net80211 HT code inherits some
5613 * (any) locking, we may have this called in parallel BUT only
5614 * one response/timeout will be called. Grr.
5616 if (atid->addba_tx_pending == 0) {
5617 ath_tx_tid_pause(sc, atid);
5618 atid->addba_tx_pending = 1;
5622 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5623 "%s: %s: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5625 ath_hal_ether_sprintf(ni->ni_macaddr),
5626 dialogtoken, baparamset, batimeout);
5627 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5628 "%s: txa_start=%d, ni_txseqs=%d\n",
5629 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5631 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5636 * Handle an ADDBA response.
5638 * We unpause the queue so TX'ing can resume.
5640 * Any packets TX'ed from this point should be "aggregate" (whether
5641 * aggregate or not) so the BAW is updated.
5643 * Note! net80211 keeps self-assigning sequence numbers until
5644 * ampdu is negotiated. This means the initially-negotiated BAW left
5645 * edge won't match the ni->ni_txseq.
5647 * So, being very dirty, the BAW left edge is "slid" here to match
5650 * What likely SHOULD happen is that all packets subsequent to the
5651 * addba request should be tagged as aggregate and queued as non-aggregate
5652 * frames; thus updating the BAW. For now though, I'll just slide the
5656 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5657 int status, int code, int batimeout)
5659 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5660 int tid = tap->txa_ac;
5661 struct ath_node *an = ATH_NODE(ni);
5662 struct ath_tid *atid = &an->an_tid[tid];
5665 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5666 "%s: %s: called; status=%d, code=%d, batimeout=%d\n", __func__,
5667 ath_hal_ether_sprintf(ni->ni_macaddr),
5668 status, code, batimeout);
5670 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5671 "%s: txa_start=%d, ni_txseqs=%d\n",
5672 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5675 * Call this first, so the interface flags get updated
5676 * before the TID is unpaused. Otherwise a race condition
5677 * exists where the unpaused TID still doesn't yet have
5678 * IEEE80211_AGGR_RUNNING set.
5680 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5683 atid->addba_tx_pending = 0;
5686 * Slide the BAW left edge to wherever net80211 left it for us.
5687 * Read above for more information.
5689 tap->txa_start = ni->ni_txseqs[tid];
5690 ath_tx_tid_resume(sc, atid);
5697 * Stop ADDBA on a queue.
5699 * This can be called whilst BAR TX is currently active on the queue,
5700 * so make sure this is unblocked before continuing.
5703 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5705 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5706 int tid = tap->txa_ac;
5707 struct ath_node *an = ATH_NODE(ni);
5708 struct ath_tid *atid = &an->an_tid[tid];
5712 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %s: called\n",
5714 ath_hal_ether_sprintf(ni->ni_macaddr));
5717 * Pause TID traffic early, so there aren't any races
5718 * Unblock the pending BAR held traffic, if it's currently paused.
5721 ath_tx_tid_pause(sc, atid);
5722 if (atid->bar_wait) {
5724 * bar_unsuspend() expects bar_tx == 1, as it should be
5725 * called from the TX completion path. This quietens
5726 * the warning. It's cleared for us anyway.
5729 ath_tx_tid_bar_unsuspend(sc, atid);
5733 /* There's no need to hold the TXQ lock here */
5734 sc->sc_addba_stop(ni, tap);
5737 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
5738 * it'll set the cleanup flag, and it'll be unpaused once
5739 * things have been cleaned up.
5743 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
5745 * Unpause the TID if no cleanup is required.
5747 if (! atid->cleanup_inprogress)
5748 ath_tx_tid_resume(sc, atid);
5751 /* Handle completing frames and fail them */
5752 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5753 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5754 ath_tx_default_comp(sc, bf, 1);
5760 * Handle a node reassociation.
5762 * We may have a bunch of frames queued to the hardware; those need
5763 * to be marked as cleanup.
5766 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
5768 struct ath_tid *tid;
5775 ATH_TX_UNLOCK_ASSERT(sc);
5778 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
5779 tid = &an->an_tid[i];
5780 if (tid->hwq_depth == 0)
5782 ath_tx_tid_pause(sc, tid);
5783 DPRINTF(sc, ATH_DEBUG_NODE,
5784 "%s: %s: TID %d: cleaning up TID\n",
5786 ath_hal_ether_sprintf(an->an_node.ni_macaddr),
5788 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
5790 * Unpause the TID if no cleanup is required.
5792 if (! tid->cleanup_inprogress)
5793 ath_tx_tid_resume(sc, tid);
5797 /* Handle completing frames and fail them */
5798 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5799 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5800 ath_tx_default_comp(sc, bf, 1);
5805 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
5806 * it simply tears down the aggregation session. Ew.
5808 * It however will call ieee80211_ampdu_stop() which will call
5809 * ic->ic_addba_stop().
5811 * XXX This uses a hard-coded max BAR count value; the whole
5812 * XXX BAR TX success or failure should be better handled!
5815 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5818 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5819 int tid = tap->txa_ac;
5820 struct ath_node *an = ATH_NODE(ni);
5821 struct ath_tid *atid = &an->an_tid[tid];
5822 int attempts = tap->txa_attempts;
5824 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5825 "%s: %s: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d\n",
5827 ath_hal_ether_sprintf(ni->ni_macaddr),
5833 /* Note: This may update the BAW details */
5834 sc->sc_bar_response(ni, tap, status);
5836 /* Unpause the TID */
5838 * XXX if this is attempt=50, the TID will be downgraded
5839 * XXX to a non-aggregate session. So we must unpause the
5840 * XXX TID here or it'll never be done.
5842 * Also, don't call it if bar_tx/bar_wait are 0; something
5843 * has beaten us to the punch? (XXX figure out what?)
5845 if (status == 0 || attempts == 50) {
5847 if (atid->bar_tx == 0 || atid->bar_wait == 0)
5848 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5849 "%s: huh? bar_tx=%d, bar_wait=%d\n",
5851 atid->bar_tx, atid->bar_wait);
5853 ath_tx_tid_bar_unsuspend(sc, atid);
5859 * This is called whenever the pending ADDBA request times out.
5860 * Unpause and reschedule the TID.
5863 ath_addba_response_timeout(struct ieee80211_node *ni,
5864 struct ieee80211_tx_ampdu *tap)
5866 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5867 int tid = tap->txa_ac;
5868 struct ath_node *an = ATH_NODE(ni);
5869 struct ath_tid *atid = &an->an_tid[tid];
5871 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5872 "%s: %s: TID=%d, called; resuming\n",
5874 ath_hal_ether_sprintf(ni->ni_macaddr),
5878 atid->addba_tx_pending = 0;
5881 /* Note: This updates the aggregate state to (again) pending */
5882 sc->sc_addba_response_timeout(ni, tap);
5884 /* Unpause the TID; which reschedules it */
5886 ath_tx_tid_resume(sc, atid);
5891 * Check if a node is asleep or not.
5894 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
5897 ATH_TX_LOCK_ASSERT(sc);
5899 return (an->an_is_powersave);
5903 * Mark a node as currently "in powersaving."
5904 * This suspends all traffic on the node.
5906 * This must be called with the node/tx locks free.
5908 * XXX TODO: the locking silliness below is due to how the node
5909 * locking currently works. Right now, the node lock is grabbed
5910 * to do rate control lookups and these are done with the TX
5911 * queue lock held. This means the node lock can't be grabbed
5912 * first here or a LOR will occur.
5914 * Eventually (hopefully!) the TX path code will only grab
5915 * the TXQ lock when transmitting and the ath_node lock when
5916 * doing node/TID operations. There are other complications -
5917 * the sched/unsched operations involve walking the per-txq
5918 * 'active tid' list and this requires both locks to be held.
5921 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
5923 struct ath_tid *atid;
5924 struct ath_txq *txq;
5927 ATH_TX_UNLOCK_ASSERT(sc);
5929 /* Suspend all traffic on the node */
5932 if (an->an_is_powersave) {
5933 DPRINTF(sc, ATH_DEBUG_XMIT,
5934 "%s: %s: node was already asleep!\n",
5935 __func__, ath_hal_ether_sprintf(an->an_node.ni_macaddr));
5940 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
5941 atid = &an->an_tid[tid];
5942 txq = sc->sc_ac2q[atid->ac];
5944 ath_tx_tid_pause(sc, atid);
5947 /* Mark node as in powersaving */
5948 an->an_is_powersave = 1;
5954 * Mark a node as currently "awake."
5955 * This resumes all traffic to the node.
5958 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
5960 struct ath_tid *atid;
5961 struct ath_txq *txq;
5964 ATH_TX_UNLOCK_ASSERT(sc);
5969 if (an->an_is_powersave == 0) {
5971 DPRINTF(sc, ATH_DEBUG_XMIT,
5972 "%s: an=%p: node was already awake\n",
5977 /* Mark node as awake */
5978 an->an_is_powersave = 0;
5980 * Clear any pending leaked frame requests
5982 an->an_leak_count = 0;
5984 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
5985 atid = &an->an_tid[tid];
5986 txq = sc->sc_ac2q[atid->ac];
5988 ath_tx_tid_resume(sc, atid);
5994 ath_legacy_dma_txsetup(struct ath_softc *sc)
5997 /* nothing new needed */
6002 ath_legacy_dma_txteardown(struct ath_softc *sc)
6005 /* nothing new needed */
6010 ath_xmit_setup_legacy(struct ath_softc *sc)
6013 * For now, just set the descriptor length to sizeof(ath_desc);
6014 * worry about extracting the real length out of the HAL later.
6016 sc->sc_tx_desclen = sizeof(struct ath_desc);
6017 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6018 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6020 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6021 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6022 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6024 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6025 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6027 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;