2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
3 * Copyright (c) 2010-2012 Adrian Chadd, Xenion Pty Ltd
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer,
11 * without modification.
12 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
13 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
14 * redistribution must be conditioned upon including a substantially
15 * similar Disclaimer requirement for further binary redistribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
23 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
26 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGES.
31 #include <sys/cdefs.h>
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>
108 * How many retries to perform in software
110 #define SWMAX_RETRIES 10
113 * What queue to throw the non-QoS TID traffic into
115 #define ATH_NONQOS_TID_AC WME_AC_VO
118 static int ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an);
120 static int ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an,
122 static int ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an,
124 static ieee80211_seq ath_tx_tid_seqno_assign(struct ath_softc *sc,
125 struct ieee80211_node *ni, struct ath_buf *bf, struct mbuf *m0);
126 static int ath_tx_action_frame_override_queue(struct ath_softc *sc,
127 struct ieee80211_node *ni, struct mbuf *m0, int *tid);
128 static struct ath_buf *
129 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
130 struct ath_tid *tid, struct ath_buf *bf);
134 ath_tx_alq_post(struct ath_softc *sc, struct ath_buf *bf_first)
140 /* XXX we should skip out early if debugging isn't enabled! */
144 /* XXX should ensure bf_nseg > 0! */
145 if (bf->bf_nseg == 0)
147 n = ((bf->bf_nseg - 1) / sc->sc_tx_nmaps) + 1;
148 for (i = 0, ds = (const char *) bf->bf_desc;
150 i++, ds += sc->sc_tx_desclen) {
151 if_ath_alq_post(&sc->sc_alq,
159 #endif /* ATH_DEBUG_ALQ */
162 * Whether to use the 11n rate scenario functions or not
165 ath_tx_is_11n(struct ath_softc *sc)
167 return ((sc->sc_ah->ah_magic == 0x20065416) ||
168 (sc->sc_ah->ah_magic == 0x19741014));
172 * Obtain the current TID from the given frame.
174 * Non-QoS frames need to go into TID 16 (IEEE80211_NONQOS_TID.)
175 * This has implications for which AC/priority the packet is placed
179 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
181 const struct ieee80211_frame *wh;
182 int pri = M_WME_GETAC(m0);
184 wh = mtod(m0, const struct ieee80211_frame *);
185 if (! IEEE80211_QOS_HAS_SEQ(wh))
186 return IEEE80211_NONQOS_TID;
188 return WME_AC_TO_TID(pri);
192 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
194 struct ieee80211_frame *wh;
196 wh = mtod(bf->bf_m, struct ieee80211_frame *);
197 /* Only update/resync if needed */
198 if (bf->bf_state.bfs_isretried == 0) {
199 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
200 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
201 BUS_DMASYNC_PREWRITE);
203 bf->bf_state.bfs_isretried = 1;
204 bf->bf_state.bfs_retries ++;
208 * Determine what the correct AC queue for the given frame
211 * This code assumes that the TIDs map consistently to
212 * the underlying hardware (or software) ath_txq.
213 * Since the sender may try to set an AC which is
214 * arbitrary, non-QoS TIDs may end up being put on
215 * completely different ACs. There's no way to put a
216 * TID into multiple ath_txq's for scheduling, so
217 * for now we override the AC/TXQ selection and set
218 * non-QOS TID frames into the BE queue.
220 * This may be completely incorrect - specifically,
221 * some management frames may end up out of order
222 * compared to the QoS traffic they're controlling.
223 * I'll look into this later.
226 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
228 const struct ieee80211_frame *wh;
229 int pri = M_WME_GETAC(m0);
230 wh = mtod(m0, const struct ieee80211_frame *);
231 if (IEEE80211_QOS_HAS_SEQ(wh))
234 return ATH_NONQOS_TID_AC;
238 ath_txfrag_cleanup(struct ath_softc *sc,
239 ath_bufhead *frags, struct ieee80211_node *ni)
241 struct ath_buf *bf, *next;
243 ATH_TXBUF_LOCK_ASSERT(sc);
245 TAILQ_FOREACH_SAFE(bf, frags, bf_list, next) {
246 /* NB: bf assumed clean */
247 TAILQ_REMOVE(frags, bf, bf_list);
248 ath_returnbuf_head(sc, bf);
249 ieee80211_node_decref(ni);
254 * Setup xmit of a fragmented frame. Allocate a buffer
255 * for each frag and bump the node reference count to
256 * reflect the held reference to be setup by ath_tx_start.
259 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
260 struct mbuf *m0, struct ieee80211_node *ni)
266 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
267 /* XXX non-management? */
268 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
269 if (bf == NULL) { /* out of buffers, cleanup */
270 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
272 ath_txfrag_cleanup(sc, frags, ni);
275 ieee80211_node_incref(ni);
276 TAILQ_INSERT_TAIL(frags, bf, bf_list);
278 ATH_TXBUF_UNLOCK(sc);
280 return !TAILQ_EMPTY(frags);
284 * Reclaim mbuf resources. For fragmented frames we
285 * need to claim each frag chained with m_nextpkt.
288 ath_freetx(struct mbuf *m)
296 } while ((m = next) != NULL);
300 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
306 * Load the DMA map so any coalescing is done. This
307 * also calculates the number of descriptors we need.
309 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
310 bf->bf_segs, &bf->bf_nseg,
312 if (error == EFBIG) {
313 /* XXX packet requires too many descriptors */
314 bf->bf_nseg = ATH_MAX_SCATTER + 1;
315 } else if (error != 0) {
316 sc->sc_stats.ast_tx_busdma++;
321 * Discard null packets and check for packets that
322 * require too many TX descriptors. We try to convert
323 * the latter to a cluster.
325 if (bf->bf_nseg > ATH_MAX_SCATTER) { /* too many desc's, linearize */
326 sc->sc_stats.ast_tx_linear++;
327 m = m_collapse(m0, M_NOWAIT, ATH_MAX_SCATTER);
330 sc->sc_stats.ast_tx_nombuf++;
334 error = bus_dmamap_load_mbuf_sg(sc->sc_dmat, bf->bf_dmamap, m0,
335 bf->bf_segs, &bf->bf_nseg,
338 sc->sc_stats.ast_tx_busdma++;
342 KASSERT(bf->bf_nseg <= ATH_MAX_SCATTER,
343 ("too many segments after defrag; nseg %u", bf->bf_nseg));
344 } else if (bf->bf_nseg == 0) { /* null packet, discard */
345 sc->sc_stats.ast_tx_nodata++;
349 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
350 __func__, m0, m0->m_pkthdr.len);
351 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
358 * Chain together segments+descriptors for a frame - 11n or otherwise.
360 * For aggregates, this is called on each frame in the aggregate.
363 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
364 struct ath_buf *bf, int is_aggr, int is_first_subframe,
365 int is_last_subframe)
367 struct ath_hal *ah = sc->sc_ah;
370 HAL_DMA_ADDR bufAddrList[4];
371 uint32_t segLenList[4];
376 * XXX There's txdma and txdma_mgmt; the descriptor
379 struct ath_descdma *dd = &sc->sc_txdma;
382 * Fillin the remainder of the descriptor info.
386 * We need the number of TX data pointers in each descriptor.
387 * EDMA and later chips support 4 TX buffers per descriptor;
388 * previous chips just support one.
390 numTxMaps = sc->sc_tx_nmaps;
393 * For EDMA and later chips ensure the TX map is fully populated
394 * before advancing to the next descriptor.
396 ds = (char *) bf->bf_desc;
398 bzero(bufAddrList, sizeof(bufAddrList));
399 bzero(segLenList, sizeof(segLenList));
400 for (i = 0; i < bf->bf_nseg; i++) {
401 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
402 segLenList[bp] = bf->bf_segs[i].ds_len;
406 * Go to the next segment if this isn't the last segment
407 * and there's space in the current TX map.
409 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
413 * Last segment or we're out of buffer pointers.
417 if (i == bf->bf_nseg - 1)
418 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
420 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
421 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
424 * XXX This assumes that bfs_txq is the actual destination
425 * hardware queue at this point. It may not have been
426 * assigned, it may actually be pointing to the multicast
427 * software TXQ id. These must be fixed!
429 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
432 , bf->bf_descid /* XXX desc id */
433 , bf->bf_state.bfs_tx_queue
434 , isFirstDesc /* first segment */
435 , i == bf->bf_nseg - 1 /* last segment */
436 , (struct ath_desc *) ds0 /* first descriptor */
440 * Make sure the 11n aggregate fields are cleared.
442 * XXX TODO: this doesn't need to be called for
443 * aggregate frames; as it'll be called on all
444 * sub-frames. Since the descriptors are in
445 * non-cacheable memory, this leads to some
446 * rather slow writes on MIPS/ARM platforms.
448 if (ath_tx_is_11n(sc))
449 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
452 * If 11n is enabled, set it up as if it's an aggregate
455 if (is_last_subframe) {
456 ath_hal_set11n_aggr_last(sc->sc_ah,
457 (struct ath_desc *) ds);
458 } else if (is_aggr) {
460 * This clears the aggrlen field; so
461 * the caller needs to call set_aggr_first()!
463 * XXX TODO: don't call this for the first
464 * descriptor in the first frame in an
467 ath_hal_set11n_aggr_middle(sc->sc_ah,
468 (struct ath_desc *) ds,
469 bf->bf_state.bfs_ndelim);
472 bf->bf_lastds = (struct ath_desc *) ds;
475 * Don't forget to skip to the next descriptor.
477 ds += sc->sc_tx_desclen;
481 * .. and don't forget to blank these out!
483 bzero(bufAddrList, sizeof(bufAddrList));
484 bzero(segLenList, sizeof(segLenList));
486 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
490 * Set the rate control fields in the given descriptor based on
491 * the bf_state fields and node state.
493 * The bfs fields should already be set with the relevant rate
494 * control information, including whether MRR is to be enabled.
496 * Since the FreeBSD HAL currently sets up the first TX rate
497 * in ath_hal_setuptxdesc(), this will setup the MRR
498 * conditionally for the pre-11n chips, and call ath_buf_set_rate
499 * unconditionally for 11n chips. These require the 11n rate
500 * scenario to be set if MCS rates are enabled, so it's easier
501 * to just always call it. The caller can then only set rates 2, 3
502 * and 4 if multi-rate retry is needed.
505 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
508 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
510 /* If mrr is disabled, blank tries 1, 2, 3 */
511 if (! bf->bf_state.bfs_ismrr)
512 rc[1].tries = rc[2].tries = rc[3].tries = 0;
516 * If NOACK is set, just set ntries=1.
518 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
519 rc[1].tries = rc[2].tries = rc[3].tries = 0;
525 * Always call - that way a retried descriptor will
526 * have the MRR fields overwritten.
528 * XXX TODO: see if this is really needed - setting up
529 * the first descriptor should set the MRR fields to 0
532 if (ath_tx_is_11n(sc)) {
533 ath_buf_set_rate(sc, ni, bf);
535 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
536 , rc[1].ratecode, rc[1].tries
537 , rc[2].ratecode, rc[2].tries
538 , rc[3].ratecode, rc[3].tries
544 * Setup segments+descriptors for an 11n aggregate.
545 * bf_first is the first buffer in the aggregate.
546 * The descriptor list must already been linked together using
550 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
552 struct ath_buf *bf, *bf_prev = NULL;
553 struct ath_desc *ds0 = bf_first->bf_desc;
555 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
556 __func__, bf_first->bf_state.bfs_nframes,
557 bf_first->bf_state.bfs_al);
561 if (bf->bf_state.bfs_txrate0 == 0)
562 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
564 if (bf->bf_state.bfs_rc[0].ratecode == 0)
565 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
569 * Setup all descriptors of all subframes - this will
570 * call ath_hal_set11naggrmiddle() on every frame.
573 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
574 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
575 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
576 SEQNO(bf->bf_state.bfs_seqno));
579 * Setup the initial fields for the first descriptor - all
580 * the non-11n specific stuff.
582 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
583 , bf->bf_state.bfs_pktlen /* packet length */
584 , bf->bf_state.bfs_hdrlen /* header length */
585 , bf->bf_state.bfs_atype /* Atheros packet type */
586 , bf->bf_state.bfs_txpower /* txpower */
587 , bf->bf_state.bfs_txrate0
588 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
589 , bf->bf_state.bfs_keyix /* key cache index */
590 , bf->bf_state.bfs_txantenna /* antenna mode */
591 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
592 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
593 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
597 * First descriptor? Setup the rate control and initial
598 * aggregate header information.
600 if (bf == bf_first) {
602 * setup first desc with rate and aggr info
604 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
608 * Setup the descriptors for a multi-descriptor frame.
609 * This is both aggregate and non-aggregate aware.
611 ath_tx_chaindesclist(sc, ds0, bf,
613 !! (bf == bf_first), /* is_first_subframe */
614 !! (bf->bf_next == NULL) /* is_last_subframe */
617 if (bf == bf_first) {
619 * Initialise the first 11n aggregate with the
620 * aggregate length and aggregate enable bits.
622 ath_hal_set11n_aggr_first(sc->sc_ah,
625 bf->bf_state.bfs_ndelim);
629 * Link the last descriptor of the previous frame
630 * to the beginning descriptor of this frame.
633 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
636 /* Save a copy so we can link the next descriptor in */
642 * Set the first descriptor bf_lastds field to point to
643 * the last descriptor in the last subframe, that's where
644 * the status update will occur.
646 bf_first->bf_lastds = bf_prev->bf_lastds;
649 * And bf_last in the first descriptor points to the end of
650 * the aggregate list.
652 bf_first->bf_last = bf_prev;
655 * For non-AR9300 NICs, which require the rate control
656 * in the final descriptor - let's set that up now.
658 * This is because the filltxdesc() HAL call doesn't
659 * populate the last segment with rate control information
660 * if firstSeg is also true. For non-aggregate frames
661 * that is fine, as the first frame already has rate control
662 * info. But if the last frame in an aggregate has one
663 * descriptor, both firstseg and lastseg will be true and
664 * the rate info isn't copied.
666 * This is inefficient on MIPS/ARM platforms that have
667 * non-cachable memory for TX descriptors, but we'll just
670 * As to why the rate table is stashed in the last descriptor
671 * rather than the first descriptor? Because proctxdesc()
672 * is called on the final descriptor in an MPDU or A-MPDU -
673 * ie, the one that gets updated by the hardware upon
674 * completion. That way proctxdesc() doesn't need to know
675 * about the first _and_ last TX descriptor.
677 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
679 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
683 * Hand-off a frame to the multicast TX queue.
685 * This is a software TXQ which will be appended to the CAB queue
686 * during the beacon setup code.
688 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
689 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
690 * with the actual hardware txq, or all of this will fall apart.
692 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
693 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
697 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
700 ATH_TX_LOCK_ASSERT(sc);
702 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
703 ("%s: busy status 0x%x", __func__, bf->bf_flags));
706 * Ensure that the tx queue is the cabq, so things get
709 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
710 DPRINTF(sc, ATH_DEBUG_XMIT,
711 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
712 __func__, bf, bf->bf_state.bfs_tx_queue,
717 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
718 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
719 struct ieee80211_frame *wh;
721 /* mark previous frame */
722 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
723 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
724 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
725 BUS_DMASYNC_PREWRITE);
727 /* link descriptor */
728 ath_hal_settxdesclink(sc->sc_ah,
732 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
737 * Hand-off packet to a hardware queue.
740 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
743 struct ath_hal *ah = sc->sc_ah;
744 struct ath_buf *bf_first;
747 * Insert the frame on the outbound list and pass it on
748 * to the hardware. Multicast frames buffered for power
749 * save stations and transmit from the CAB queue are stored
750 * on a s/w only queue and loaded on to the CAB queue in
751 * the SWBA handler since frames only go out on DTIM and
752 * to avoid possible races.
754 ATH_TX_LOCK_ASSERT(sc);
755 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
756 ("%s: busy status 0x%x", __func__, bf->bf_flags));
757 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
758 ("ath_tx_handoff_hw called for mcast queue"));
761 * XXX racy, should hold the PCU lock when checking this,
762 * and also should ensure that the TX counter is >0!
764 KASSERT((sc->sc_inreset_cnt == 0),
765 ("%s: TX during reset?\n", __func__));
769 * This causes a LOR. Find out where the PCU lock is being
770 * held whilst the TXQ lock is grabbed - that shouldn't
774 if (sc->sc_inreset_cnt) {
776 DPRINTF(sc, ATH_DEBUG_RESET,
777 "%s: called with sc_in_reset != 0\n",
779 DPRINTF(sc, ATH_DEBUG_XMIT,
780 "%s: queued: TXDP[%u] = %p (%p) depth %d\n",
781 __func__, txq->axq_qnum,
782 (caddr_t)bf->bf_daddr, bf->bf_desc,
784 /* XXX axq_link needs to be set and updated! */
785 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
786 if (bf->bf_state.bfs_aggr)
787 txq->axq_aggr_depth++;
796 * XXX TODO: if there's a holdingbf, then
797 * ATH_TXQ_PUTRUNNING should be clear.
799 * If there is a holdingbf and the list is empty,
800 * then axq_link should be pointing to the holdingbf.
802 * Otherwise it should point to the last descriptor
803 * in the last ath_buf.
805 * In any case, we should really ensure that we
806 * update the previous descriptor link pointer to
807 * this descriptor, regardless of all of the above state.
809 * For now this is captured by having axq_link point
810 * to either the holdingbf (if the TXQ list is empty)
811 * or the end of the list (if the TXQ list isn't empty.)
812 * I'd rather just kill axq_link here and do it as above.
816 * Append the frame to the TX queue.
818 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
819 ATH_KTR(sc, ATH_KTR_TX, 3,
820 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
827 * If there's a link pointer, update it.
829 * XXX we should replace this with the above logic, just
830 * to kill axq_link with fire.
832 if (txq->axq_link != NULL) {
833 *txq->axq_link = bf->bf_daddr;
834 DPRINTF(sc, ATH_DEBUG_XMIT,
835 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
836 txq->axq_qnum, txq->axq_link,
837 (caddr_t)bf->bf_daddr, bf->bf_desc,
839 ATH_KTR(sc, ATH_KTR_TX, 5,
840 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
842 txq->axq_qnum, txq->axq_link,
843 (caddr_t)bf->bf_daddr, bf->bf_desc,
848 * If we've not pushed anything into the hardware yet,
849 * push the head of the queue into the TxDP.
851 * Once we've started DMA, there's no guarantee that
852 * updating the TxDP with a new value will actually work.
853 * So we just don't do that - if we hit the end of the list,
854 * we keep that buffer around (the "holding buffer") and
855 * re-start DMA by updating the link pointer of _that_
856 * descriptor and then restart DMA.
858 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
859 bf_first = TAILQ_FIRST(&txq->axq_q);
860 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
861 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
862 DPRINTF(sc, ATH_DEBUG_XMIT,
863 "%s: TXDP[%u] = %p (%p) depth %d\n",
864 __func__, txq->axq_qnum,
865 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
867 ATH_KTR(sc, ATH_KTR_TX, 5,
868 "ath_tx_handoff: TXDP[%u] = %p (%p) "
869 "lastds=%p depth %d",
871 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
877 * Ensure that the bf TXQ matches this TXQ, so later
878 * checking and holding buffer manipulation is sane.
880 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
881 DPRINTF(sc, ATH_DEBUG_XMIT,
882 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
883 __func__, bf, bf->bf_state.bfs_tx_queue,
888 * Track aggregate queue depth.
890 if (bf->bf_state.bfs_aggr)
891 txq->axq_aggr_depth++;
894 * Update the link pointer.
896 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
901 * If we wrote a TxDP above, DMA will start from here.
903 * If DMA is running, it'll do nothing.
905 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
906 * or VEOL) then it stops at the last transmitted write.
907 * We then append a new frame by updating the link pointer
908 * in that descriptor and then kick TxE here; it will re-read
909 * that last descriptor and find the new descriptor to transmit.
911 * This is why we keep the holding descriptor around.
913 ath_hal_txstart(ah, txq->axq_qnum);
915 ATH_KTR(sc, ATH_KTR_TX, 1,
916 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
920 * Restart TX DMA for the given TXQ.
922 * This must be called whether the queue is empty or not.
925 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
927 struct ath_buf *bf, *bf_last;
929 ATH_TXQ_LOCK_ASSERT(txq);
931 /* XXX make this ATH_TXQ_FIRST */
932 bf = TAILQ_FIRST(&txq->axq_q);
933 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
938 DPRINTF(sc, ATH_DEBUG_RESET,
939 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
944 (uint32_t) bf->bf_daddr);
947 if (sc->sc_debug & ATH_DEBUG_RESET)
948 ath_tx_dump(sc, txq);
952 * This is called from a restart, so DMA is known to be
953 * completely stopped.
955 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
956 ("%s: Q%d: called with PUTRUNNING=1\n",
960 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
961 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
963 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
965 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
969 * Hand off a packet to the hardware (or mcast queue.)
971 * The relevant hardware txq should be locked.
974 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
977 ATH_TX_LOCK_ASSERT(sc);
980 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
981 ath_tx_alq_post(sc, bf);
984 if (txq->axq_qnum == ATH_TXQ_SWQ)
985 ath_tx_handoff_mcast(sc, txq, bf);
987 ath_tx_handoff_hw(sc, txq, bf);
991 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
992 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
995 DPRINTF(sc, ATH_DEBUG_XMIT,
996 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
1005 const struct ieee80211_cipher *cip;
1006 struct ieee80211_key *k;
1009 * Construct the 802.11 header+trailer for an encrypted
1010 * frame. The only reason this can fail is because of an
1011 * unknown or unsupported cipher/key type.
1013 k = ieee80211_crypto_encap(ni, m0);
1016 * This can happen when the key is yanked after the
1017 * frame was queued. Just discard the frame; the
1018 * 802.11 layer counts failures and provides
1019 * debugging/diagnostics.
1024 * Adjust the packet + header lengths for the crypto
1025 * additions and calculate the h/w key index. When
1026 * a s/w mic is done the frame will have had any mic
1027 * added to it prior to entry so m0->m_pkthdr.len will
1028 * account for it. Otherwise we need to add it to the
1032 (*hdrlen) += cip->ic_header;
1033 (*pktlen) += cip->ic_header + cip->ic_trailer;
1034 /* NB: frags always have any TKIP MIC done in s/w */
1035 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1036 (*pktlen) += cip->ic_miclen;
1037 (*keyix) = k->wk_keyix;
1038 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1040 * Use station key cache slot, if assigned.
1042 (*keyix) = ni->ni_ucastkey.wk_keyix;
1043 if ((*keyix) == IEEE80211_KEYIX_NONE)
1044 (*keyix) = HAL_TXKEYIX_INVALID;
1046 (*keyix) = HAL_TXKEYIX_INVALID;
1052 * Calculate whether interoperability protection is required for
1055 * This requires the rate control information be filled in,
1056 * as the protection requirement depends upon the current
1057 * operating mode / PHY.
1060 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1062 struct ieee80211_frame *wh;
1066 const HAL_RATE_TABLE *rt = sc->sc_currates;
1067 struct ifnet *ifp = sc->sc_ifp;
1068 struct ieee80211com *ic = ifp->if_l2com;
1070 flags = bf->bf_state.bfs_txflags;
1071 rix = bf->bf_state.bfs_rc[0].rix;
1072 shortPreamble = bf->bf_state.bfs_shpream;
1073 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1076 * If 802.11g protection is enabled, determine whether
1077 * to use RTS/CTS or just CTS. Note that this is only
1078 * done for OFDM unicast frames.
1080 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1081 rt->info[rix].phy == IEEE80211_T_OFDM &&
1082 (flags & HAL_TXDESC_NOACK) == 0) {
1083 bf->bf_state.bfs_doprot = 1;
1084 /* XXX fragments must use CCK rates w/ protection */
1085 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1086 flags |= HAL_TXDESC_RTSENA;
1087 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1088 flags |= HAL_TXDESC_CTSENA;
1091 * For frags it would be desirable to use the
1092 * highest CCK rate for RTS/CTS. But stations
1093 * farther away may detect it at a lower CCK rate
1094 * so use the configured protection rate instead
1097 sc->sc_stats.ast_tx_protect++;
1101 * If 11n protection is enabled and it's a HT frame,
1104 * XXX ic_htprotmode or ic_curhtprotmode?
1105 * XXX should it_htprotmode only matter if ic_curhtprotmode
1106 * XXX indicates it's not a HT pure environment?
1108 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1109 rt->info[rix].phy == IEEE80211_T_HT &&
1110 (flags & HAL_TXDESC_NOACK) == 0) {
1111 flags |= HAL_TXDESC_RTSENA;
1112 sc->sc_stats.ast_tx_htprotect++;
1114 bf->bf_state.bfs_txflags = flags;
1118 * Update the frame duration given the currently selected rate.
1120 * This also updates the frame duration value, so it will require
1124 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1126 struct ieee80211_frame *wh;
1130 struct ath_hal *ah = sc->sc_ah;
1131 const HAL_RATE_TABLE *rt = sc->sc_currates;
1132 int isfrag = bf->bf_m->m_flags & M_FRAG;
1134 flags = bf->bf_state.bfs_txflags;
1135 rix = bf->bf_state.bfs_rc[0].rix;
1136 shortPreamble = bf->bf_state.bfs_shpream;
1137 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1140 * Calculate duration. This logically belongs in the 802.11
1141 * layer but it lacks sufficient information to calculate it.
1143 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1144 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1147 dur = rt->info[rix].spAckDuration;
1149 dur = rt->info[rix].lpAckDuration;
1150 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1151 dur += dur; /* additional SIFS+ACK */
1153 * Include the size of next fragment so NAV is
1154 * updated properly. The last fragment uses only
1157 * XXX TODO: ensure that the rate lookup for each
1158 * fragment is the same as the rate used by the
1161 dur += ath_hal_computetxtime(ah,
1164 rix, shortPreamble);
1168 * Force hardware to use computed duration for next
1169 * fragment by disabling multi-rate retry which updates
1170 * duration based on the multi-rate duration table.
1172 bf->bf_state.bfs_ismrr = 0;
1173 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1174 /* XXX update bfs_rc[0].try? */
1177 /* Update the duration field itself */
1178 *(u_int16_t *)wh->i_dur = htole16(dur);
1183 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1184 int cix, int shortPreamble)
1189 * CTS transmit rate is derived from the transmit rate
1190 * by looking in the h/w rate table. We must also factor
1191 * in whether or not a short preamble is to be used.
1193 /* NB: cix is set above where RTS/CTS is enabled */
1194 KASSERT(cix != 0xff, ("cix not setup"));
1195 ctsrate = rt->info[cix].rateCode;
1197 /* XXX this should only matter for legacy rates */
1199 ctsrate |= rt->info[cix].shortPreamble;
1205 * Calculate the RTS/CTS duration for legacy frames.
1208 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1209 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1212 int ctsduration = 0;
1214 /* This mustn't be called for HT modes */
1215 if (rt->info[cix].phy == IEEE80211_T_HT) {
1216 printf("%s: HT rate where it shouldn't be (0x%x)\n",
1217 __func__, rt->info[cix].rateCode);
1222 * Compute the transmit duration based on the frame
1223 * size and the size of an ACK frame. We call into the
1224 * HAL to do the computation since it depends on the
1225 * characteristics of the actual PHY being used.
1227 * NB: CTS is assumed the same size as an ACK so we can
1228 * use the precalculated ACK durations.
1230 if (shortPreamble) {
1231 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1232 ctsduration += rt->info[cix].spAckDuration;
1233 ctsduration += ath_hal_computetxtime(ah,
1234 rt, pktlen, rix, AH_TRUE);
1235 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1236 ctsduration += rt->info[rix].spAckDuration;
1238 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1239 ctsduration += rt->info[cix].lpAckDuration;
1240 ctsduration += ath_hal_computetxtime(ah,
1241 rt, pktlen, rix, AH_FALSE);
1242 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1243 ctsduration += rt->info[rix].lpAckDuration;
1246 return (ctsduration);
1250 * Update the given ath_buf with updated rts/cts setup and duration
1253 * To support rate lookups for each software retry, the rts/cts rate
1254 * and cts duration must be re-calculated.
1256 * This function assumes the RTS/CTS flags have been set as needed;
1257 * mrr has been disabled; and the rate control lookup has been done.
1259 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1260 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1263 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1265 uint16_t ctsduration = 0;
1266 uint8_t ctsrate = 0;
1267 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1269 const HAL_RATE_TABLE *rt = sc->sc_currates;
1272 * No RTS/CTS enabled? Don't bother.
1274 if ((bf->bf_state.bfs_txflags &
1275 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1276 /* XXX is this really needed? */
1277 bf->bf_state.bfs_ctsrate = 0;
1278 bf->bf_state.bfs_ctsduration = 0;
1283 * If protection is enabled, use the protection rix control
1284 * rate. Otherwise use the rate0 control rate.
1286 if (bf->bf_state.bfs_doprot)
1287 rix = sc->sc_protrix;
1289 rix = bf->bf_state.bfs_rc[0].rix;
1292 * If the raw path has hard-coded ctsrate0 to something,
1295 if (bf->bf_state.bfs_ctsrate0 != 0)
1296 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1298 /* Control rate from above */
1299 cix = rt->info[rix].controlRate;
1301 /* Calculate the rtscts rate for the given cix */
1302 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1303 bf->bf_state.bfs_shpream);
1305 /* The 11n chipsets do ctsduration calculations for you */
1306 if (! ath_tx_is_11n(sc))
1307 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1308 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1309 rt, bf->bf_state.bfs_txflags);
1311 /* Squirrel away in ath_buf */
1312 bf->bf_state.bfs_ctsrate = ctsrate;
1313 bf->bf_state.bfs_ctsduration = ctsduration;
1316 * Must disable multi-rate retry when using RTS/CTS.
1318 if (!sc->sc_mrrprot) {
1319 bf->bf_state.bfs_ismrr = 0;
1320 bf->bf_state.bfs_try0 =
1321 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1326 * Setup the descriptor chain for a normal or fast-frame
1329 * XXX TODO: extend to include the destination hardware QCU ID.
1330 * Make sure that is correct. Make sure that when being added
1331 * to the mcastq, the CABQ QCUID is set or things will get a bit
1335 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1337 struct ath_desc *ds = bf->bf_desc;
1338 struct ath_hal *ah = sc->sc_ah;
1340 if (bf->bf_state.bfs_txrate0 == 0)
1341 DPRINTF(sc, ATH_DEBUG_XMIT,
1342 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1344 ath_hal_setuptxdesc(ah, ds
1345 , bf->bf_state.bfs_pktlen /* packet length */
1346 , bf->bf_state.bfs_hdrlen /* header length */
1347 , bf->bf_state.bfs_atype /* Atheros packet type */
1348 , bf->bf_state.bfs_txpower /* txpower */
1349 , bf->bf_state.bfs_txrate0
1350 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1351 , bf->bf_state.bfs_keyix /* key cache index */
1352 , bf->bf_state.bfs_txantenna /* antenna mode */
1353 , bf->bf_state.bfs_txflags /* flags */
1354 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1355 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1359 * This will be overriden when the descriptor chain is written.
1364 /* Set rate control and descriptor chain for this frame */
1365 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1366 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1372 * This performs a rate lookup for the given ath_buf only if it's required.
1373 * Non-data frames and raw frames don't require it.
1375 * This populates the primary and MRR entries; MRR values are
1376 * then disabled later on if something requires it (eg RTS/CTS on
1379 * This needs to be done before the RTS/CTS fields are calculated
1380 * as they may depend upon the rate chosen.
1383 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1388 if (! bf->bf_state.bfs_doratelookup)
1391 /* Get rid of any previous state */
1392 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1394 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1395 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1396 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1398 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1399 bf->bf_state.bfs_rc[0].rix = rix;
1400 bf->bf_state.bfs_rc[0].ratecode = rate;
1401 bf->bf_state.bfs_rc[0].tries = try0;
1403 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1404 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1405 bf->bf_state.bfs_rc);
1406 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1408 sc->sc_txrix = rix; /* for LED blinking */
1409 sc->sc_lastdatarix = rix; /* for fast frames */
1410 bf->bf_state.bfs_try0 = try0;
1411 bf->bf_state.bfs_txrate0 = rate;
1415 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1418 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1421 struct ath_node *an = ATH_NODE(bf->bf_node);
1423 ATH_TX_LOCK_ASSERT(sc);
1425 if (an->clrdmask == 1) {
1426 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1432 * Return whether this frame should be software queued or
1433 * direct dispatched.
1435 * When doing powersave, BAR frames should be queued but other management
1436 * frames should be directly sent.
1438 * When not doing powersave, stick BAR frames into the hardware queue
1439 * so it goes out even though the queue is paused.
1441 * For now, management frames are also software queued by default.
1444 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1445 struct mbuf *m0, int *queue_to_head)
1447 struct ieee80211_node *ni = &an->an_node;
1448 struct ieee80211_frame *wh;
1449 uint8_t type, subtype;
1451 wh = mtod(m0, struct ieee80211_frame *);
1452 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1453 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1455 (*queue_to_head) = 0;
1457 /* If it's not in powersave - direct-dispatch BAR */
1458 if ((ATH_NODE(ni)->an_is_powersave == 0)
1459 && type == IEEE80211_FC0_TYPE_CTL &&
1460 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1461 DPRINTF(sc, ATH_DEBUG_SW_TX,
1462 "%s: BAR: TX'ing direct\n", __func__);
1464 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1465 && type == IEEE80211_FC0_TYPE_CTL &&
1466 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1467 /* BAR TX whilst asleep; queue */
1468 DPRINTF(sc, ATH_DEBUG_SW_TX,
1469 "%s: swq: TX'ing\n", __func__);
1470 (*queue_to_head) = 1;
1472 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1473 && (type == IEEE80211_FC0_TYPE_MGT ||
1474 type == IEEE80211_FC0_TYPE_CTL)) {
1476 * Other control/mgmt frame; bypass software queuing
1479 DPRINTF(sc, ATH_DEBUG_XMIT,
1480 "%s: %6D: Node is asleep; sending mgmt "
1481 "(type=%d, subtype=%d)\n",
1482 __func__, ni->ni_macaddr, ":", type, subtype);
1491 * Transmit the given frame to the hardware.
1493 * The frame must already be setup; rate control must already have
1496 * XXX since the TXQ lock is being held here (and I dislike holding
1497 * it for this long when not doing software aggregation), later on
1498 * break this function into "setup_normal" and "xmit_normal". The
1499 * lock only needs to be held for the ath_tx_handoff call.
1501 * XXX we don't update the leak count here - if we're doing
1502 * direct frame dispatch, we need to be able to do it without
1503 * decrementing the leak count (eg multicast queue frames.)
1506 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1509 struct ath_node *an = ATH_NODE(bf->bf_node);
1510 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1512 ATH_TX_LOCK_ASSERT(sc);
1515 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1516 * set a completion handler however it doesn't (yet) properly
1517 * handle the strict ordering requirements needed for normal,
1518 * non-aggregate session frames.
1520 * Once this is implemented, only set CLRDMASK like this for
1521 * frames that must go out - eg management/raw frames.
1523 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1525 /* Setup the descriptor before handoff */
1526 ath_tx_do_ratelookup(sc, bf);
1527 ath_tx_calc_duration(sc, bf);
1528 ath_tx_calc_protection(sc, bf);
1529 ath_tx_set_rtscts(sc, bf);
1530 ath_tx_rate_fill_rcflags(sc, bf);
1531 ath_tx_setds(sc, bf);
1533 /* Track per-TID hardware queue depth correctly */
1536 /* Assign the completion handler */
1537 bf->bf_comp = ath_tx_normal_comp;
1539 /* Hand off to hardware */
1540 ath_tx_handoff(sc, txq, bf);
1544 * Do the basic frame setup stuff that's required before the frame
1545 * is added to a software queue.
1547 * All frames get mostly the same treatment and it's done once.
1548 * Retransmits fiddle with things like the rate control setup,
1549 * setting the retransmit bit in the packet; doing relevant DMA/bus
1550 * syncing and relinking it (back) into the hardware TX queue.
1552 * Note that this may cause the mbuf to be reallocated, so
1553 * m0 may not be valid.
1556 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1557 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1559 struct ieee80211vap *vap = ni->ni_vap;
1560 struct ath_hal *ah = sc->sc_ah;
1561 struct ifnet *ifp = sc->sc_ifp;
1562 struct ieee80211com *ic = ifp->if_l2com;
1563 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
1564 int error, iswep, ismcast, isfrag, ismrr;
1565 int keyix, hdrlen, pktlen, try0 = 0;
1566 u_int8_t rix = 0, txrate = 0;
1567 struct ath_desc *ds;
1568 struct ieee80211_frame *wh;
1569 u_int subtype, flags;
1571 const HAL_RATE_TABLE *rt;
1572 HAL_BOOL shortPreamble;
1573 struct ath_node *an;
1577 * To ensure that both sequence numbers and the CCMP PN handling
1578 * is "correct", make sure that the relevant TID queue is locked.
1579 * Otherwise the CCMP PN and seqno may appear out of order, causing
1580 * re-ordered frames to have out of order CCMP PN's, resulting
1581 * in many, many frame drops.
1583 ATH_TX_LOCK_ASSERT(sc);
1585 wh = mtod(m0, struct ieee80211_frame *);
1586 iswep = wh->i_fc[1] & IEEE80211_FC1_WEP;
1587 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1588 isfrag = m0->m_flags & M_FRAG;
1589 hdrlen = ieee80211_anyhdrsize(wh);
1591 * Packet length must not include any
1592 * pad bytes; deduct them here.
1594 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1596 /* Handle encryption twiddling if needed */
1597 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1603 /* packet header may have moved, reset our local pointer */
1604 wh = mtod(m0, struct ieee80211_frame *);
1606 pktlen += IEEE80211_CRC_LEN;
1609 * Load the DMA map so any coalescing is done. This
1610 * also calculates the number of descriptors we need.
1612 error = ath_tx_dmasetup(sc, bf, m0);
1615 bf->bf_node = ni; /* NB: held reference */
1616 m0 = bf->bf_m; /* NB: may have changed */
1617 wh = mtod(m0, struct ieee80211_frame *);
1619 /* setup descriptors */
1621 rt = sc->sc_currates;
1622 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1625 * NB: the 802.11 layer marks whether or not we should
1626 * use short preamble based on the current mode and
1627 * negotiated parameters.
1629 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1630 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1631 shortPreamble = AH_TRUE;
1632 sc->sc_stats.ast_tx_shortpre++;
1634 shortPreamble = AH_FALSE;
1638 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1640 ismrr = 0; /* default no multi-rate retry*/
1641 pri = M_WME_GETAC(m0); /* honor classification */
1642 /* XXX use txparams instead of fixed values */
1644 * Calculate Atheros packet type from IEEE80211 packet header,
1645 * setup for rate calculations, and select h/w transmit queue.
1647 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1648 case IEEE80211_FC0_TYPE_MGT:
1649 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1650 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1651 atype = HAL_PKT_TYPE_BEACON;
1652 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1653 atype = HAL_PKT_TYPE_PROBE_RESP;
1654 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1655 atype = HAL_PKT_TYPE_ATIM;
1657 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1658 rix = an->an_mgmtrix;
1659 txrate = rt->info[rix].rateCode;
1661 txrate |= rt->info[rix].shortPreamble;
1662 try0 = ATH_TXMGTTRY;
1663 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1665 case IEEE80211_FC0_TYPE_CTL:
1666 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1667 rix = an->an_mgmtrix;
1668 txrate = rt->info[rix].rateCode;
1670 txrate |= rt->info[rix].shortPreamble;
1671 try0 = ATH_TXMGTTRY;
1672 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1674 case IEEE80211_FC0_TYPE_DATA:
1675 atype = HAL_PKT_TYPE_NORMAL; /* default */
1677 * Data frames: multicast frames go out at a fixed rate,
1678 * EAPOL frames use the mgmt frame rate; otherwise consult
1679 * the rate control module for the rate to use.
1682 rix = an->an_mcastrix;
1683 txrate = rt->info[rix].rateCode;
1685 txrate |= rt->info[rix].shortPreamble;
1687 } else if (m0->m_flags & M_EAPOL) {
1688 /* XXX? maybe always use long preamble? */
1689 rix = an->an_mgmtrix;
1690 txrate = rt->info[rix].rateCode;
1692 txrate |= rt->info[rix].shortPreamble;
1693 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1696 * Do rate lookup on each TX, rather than using
1697 * the hard-coded TX information decided here.
1700 bf->bf_state.bfs_doratelookup = 1;
1702 if (cap->cap_wmeParams[pri].wmep_noackPolicy)
1703 flags |= HAL_TXDESC_NOACK;
1706 if_printf(ifp, "bogus frame type 0x%x (%s)\n",
1707 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1709 /* XXX free tx dmamap */
1715 * There are two known scenarios where the frame AC doesn't match
1716 * what the destination TXQ is.
1718 * + non-QoS frames (eg management?) that the net80211 stack has
1719 * assigned a higher AC to, but since it's a non-QoS TID, it's
1720 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1721 * It's quite possible that management frames should just be
1722 * direct dispatched to hardware rather than go via the software
1723 * queue; that should be investigated in the future. There are
1724 * some specific scenarios where this doesn't make sense, mostly
1725 * surrounding ADDBA request/response - hence why that is special
1728 * + Multicast frames going into the VAP mcast queue. That shows up
1731 * This driver should eventually support separate TID and TXQ locking,
1732 * allowing for arbitrary AC frames to appear on arbitrary software
1733 * queues, being queued to the "correct" hardware queue when needed.
1736 if (txq != sc->sc_ac2q[pri]) {
1737 DPRINTF(sc, ATH_DEBUG_XMIT,
1738 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1744 sc->sc_ac2q[pri]->axq_qnum);
1749 * Calculate miscellaneous flags.
1752 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1753 } else if (pktlen > vap->iv_rtsthreshold &&
1754 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1755 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1756 sc->sc_stats.ast_tx_rts++;
1758 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1759 sc->sc_stats.ast_tx_noack++;
1760 #ifdef IEEE80211_SUPPORT_TDMA
1761 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1762 DPRINTF(sc, ATH_DEBUG_TDMA,
1763 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1764 sc->sc_stats.ast_tdma_ack++;
1765 /* XXX free tx dmamap */
1772 * Determine if a tx interrupt should be generated for
1773 * this descriptor. We take a tx interrupt to reap
1774 * descriptors when the h/w hits an EOL condition or
1775 * when the descriptor is specifically marked to generate
1776 * an interrupt. We periodically mark descriptors in this
1777 * way to insure timely replenishing of the supply needed
1778 * for sending frames. Defering interrupts reduces system
1779 * load and potentially allows more concurrent work to be
1780 * done but if done to aggressively can cause senders to
1783 * NB: use >= to deal with sc_txintrperiod changing
1784 * dynamically through sysctl.
1786 if (flags & HAL_TXDESC_INTREQ) {
1787 txq->axq_intrcnt = 0;
1788 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1789 flags |= HAL_TXDESC_INTREQ;
1790 txq->axq_intrcnt = 0;
1793 /* This point forward is actual TX bits */
1796 * At this point we are committed to sending the frame
1797 * and we don't need to look at m_nextpkt; clear it in
1798 * case this frame is part of frag chain.
1800 m0->m_nextpkt = NULL;
1802 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1803 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1804 sc->sc_hwmap[rix].ieeerate, -1);
1806 if (ieee80211_radiotap_active_vap(vap)) {
1807 u_int64_t tsf = ath_hal_gettsf64(ah);
1809 sc->sc_tx_th.wt_tsf = htole64(tsf);
1810 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1812 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1814 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1815 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1816 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1817 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1819 ieee80211_radiotap_tx(vap, m0);
1822 /* Blank the legacy rate array */
1823 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1826 * ath_buf_set_rate needs at least one rate/try to setup
1827 * the rate scenario.
1829 bf->bf_state.bfs_rc[0].rix = rix;
1830 bf->bf_state.bfs_rc[0].tries = try0;
1831 bf->bf_state.bfs_rc[0].ratecode = txrate;
1833 /* Store the decided rate index values away */
1834 bf->bf_state.bfs_pktlen = pktlen;
1835 bf->bf_state.bfs_hdrlen = hdrlen;
1836 bf->bf_state.bfs_atype = atype;
1837 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1838 bf->bf_state.bfs_txrate0 = txrate;
1839 bf->bf_state.bfs_try0 = try0;
1840 bf->bf_state.bfs_keyix = keyix;
1841 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1842 bf->bf_state.bfs_txflags = flags;
1843 bf->bf_state.bfs_shpream = shortPreamble;
1845 /* XXX this should be done in ath_tx_setrate() */
1846 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1847 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1848 bf->bf_state.bfs_ctsduration = 0;
1849 bf->bf_state.bfs_ismrr = ismrr;
1855 * Queue a frame to the hardware or software queue.
1857 * This can be called by the net80211 code.
1859 * XXX what about locking? Or, push the seqno assign into the
1860 * XXX aggregate scheduler so its serialised?
1862 * XXX When sending management frames via ath_raw_xmit(),
1863 * should CLRDMASK be set unconditionally?
1866 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1867 struct ath_buf *bf, struct mbuf *m0)
1869 struct ieee80211vap *vap = ni->ni_vap;
1870 struct ath_vap *avp = ATH_VAP(vap);
1874 struct ath_txq *txq;
1876 const struct ieee80211_frame *wh;
1877 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1878 ieee80211_seq seqno;
1879 uint8_t type, subtype;
1882 ATH_TX_LOCK_ASSERT(sc);
1885 * Determine the target hardware queue.
1887 * For multicast frames, the txq gets overridden appropriately
1888 * depending upon the state of PS.
1890 * For any other frame, we do a TID/QoS lookup inside the frame
1891 * to see what the TID should be. If it's a non-QoS frame, the
1892 * AC and TID are overridden. The TID/TXQ code assumes the
1893 * TID is on a predictable hardware TXQ, so we don't support
1894 * having a node TID queued to multiple hardware TXQs.
1895 * This may change in the future but would require some locking
1898 pri = ath_tx_getac(sc, m0);
1899 tid = ath_tx_gettid(sc, m0);
1901 txq = sc->sc_ac2q[pri];
1902 wh = mtod(m0, struct ieee80211_frame *);
1903 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1904 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1905 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1908 * Enforce how deep the multicast queue can grow.
1910 * XXX duplicated in ath_raw_xmit().
1912 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1913 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1914 > sc->sc_txq_mcastq_maxdepth) {
1915 sc->sc_stats.ast_tx_mcastq_overflow++;
1922 * Enforce how deep the unicast queue can grow.
1924 * If the node is in power save then we don't want
1925 * the software queue to grow too deep, or a node may
1926 * end up consuming all of the ath_buf entries.
1928 * For now, only do this for DATA frames.
1930 * We will want to cap how many management/control
1931 * frames get punted to the software queue so it doesn't
1932 * fill up. But the correct solution isn't yet obvious.
1933 * In any case, this check should at least let frames pass
1934 * that we are direct-dispatching.
1936 * XXX TODO: duplicate this to the raw xmit path!
1938 if (type == IEEE80211_FC0_TYPE_DATA &&
1939 ATH_NODE(ni)->an_is_powersave &&
1940 ATH_NODE(ni)->an_swq_depth >
1941 sc->sc_txq_node_psq_maxdepth) {
1942 sc->sc_stats.ast_tx_node_psq_overflow++;
1948 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1949 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1950 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1952 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1953 __func__, tid, pri, is_ampdu);
1955 /* Set local packet state, used to queue packets to hardware */
1956 bf->bf_state.bfs_tid = tid;
1957 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
1958 bf->bf_state.bfs_pri = pri;
1962 * When servicing one or more stations in power-save mode
1963 * (or) if there is some mcast data waiting on the mcast
1964 * queue (to prevent out of order delivery) multicast frames
1965 * must be bufferd until after the beacon.
1967 * TODO: we should lock the mcastq before we check the length.
1969 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
1970 txq = &avp->av_mcastq;
1972 * Mark the frame as eventually belonging on the CAB
1973 * queue, so the descriptor setup functions will
1974 * correctly initialise the descriptor 'qcuId' field.
1976 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
1980 /* Do the generic frame setup */
1981 /* XXX should just bzero the bf_state? */
1982 bf->bf_state.bfs_dobaw = 0;
1984 /* A-MPDU TX? Manually set sequence number */
1986 * Don't do it whilst pending; the net80211 layer still
1991 * Always call; this function will
1992 * handle making sure that null data frames
1993 * don't get a sequence number from the current
1994 * TID and thus mess with the BAW.
1996 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
1999 * Don't add QoS NULL frames to the BAW.
2001 if (IEEE80211_QOS_HAS_SEQ(wh) &&
2002 subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL) {
2003 bf->bf_state.bfs_dobaw = 1;
2008 * If needed, the sequence number has been assigned.
2009 * Squirrel it away somewhere easy to get to.
2011 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
2013 /* Is ampdu pending? fetch the seqno and print it out */
2014 if (is_ampdu_pending)
2015 DPRINTF(sc, ATH_DEBUG_SW_TX,
2016 "%s: tid %d: ampdu pending, seqno %d\n",
2017 __func__, tid, M_SEQNO_GET(m0));
2019 /* This also sets up the DMA map */
2020 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
2025 /* At this point m0 could have changed! */
2030 * If it's a multicast frame, do a direct-dispatch to the
2031 * destination hardware queue. Don't bother software
2035 * If it's a BAR frame, do a direct dispatch to the
2036 * destination hardware queue. Don't bother software
2037 * queuing it, as the TID will now be paused.
2038 * Sending a BAR frame can occur from the net80211 txa timer
2039 * (ie, retries) or from the ath txtask (completion call.)
2040 * It queues directly to hardware because the TID is paused
2041 * at this point (and won't be unpaused until the BAR has
2042 * either been TXed successfully or max retries has been
2046 * Until things are better debugged - if this node is asleep
2047 * and we're sending it a non-BAR frame, direct dispatch it.
2048 * Why? Because we need to figure out what's actually being
2049 * sent - eg, during reassociation/reauthentication after
2050 * the node (last) disappeared whilst asleep, the driver should
2051 * have unpaused/unsleep'ed the node. So until that is
2052 * sorted out, use this workaround.
2054 if (txq == &avp->av_mcastq) {
2055 DPRINTF(sc, ATH_DEBUG_SW_TX,
2056 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2057 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2058 ath_tx_xmit_normal(sc, txq, bf);
2059 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2061 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2063 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2064 ath_tx_xmit_normal(sc, txq, bf);
2068 * For now, since there's no software queue,
2069 * direct-dispatch to the hardware.
2071 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2073 * Update the current leak count if
2074 * we're leaking frames; and set the
2075 * MORE flag as appropriate.
2077 ath_tx_leak_count_update(sc, tid, bf);
2078 ath_tx_xmit_normal(sc, txq, bf);
2085 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2086 struct ath_buf *bf, struct mbuf *m0,
2087 const struct ieee80211_bpf_params *params)
2089 struct ifnet *ifp = sc->sc_ifp;
2090 struct ieee80211com *ic = ifp->if_l2com;
2091 struct ath_hal *ah = sc->sc_ah;
2092 struct ieee80211vap *vap = ni->ni_vap;
2093 int error, ismcast, ismrr;
2094 int keyix, hdrlen, pktlen, try0, txantenna;
2095 u_int8_t rix, txrate;
2096 struct ieee80211_frame *wh;
2099 const HAL_RATE_TABLE *rt;
2100 struct ath_desc *ds;
2104 uint8_t type, subtype;
2107 ATH_TX_LOCK_ASSERT(sc);
2109 wh = mtod(m0, struct ieee80211_frame *);
2110 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2111 hdrlen = ieee80211_anyhdrsize(wh);
2113 * Packet length must not include any
2114 * pad bytes; deduct them here.
2116 /* XXX honor IEEE80211_BPF_DATAPAD */
2117 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2119 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2120 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2122 ATH_KTR(sc, ATH_KTR_TX, 2,
2123 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2125 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2128 pri = params->ibp_pri & 3;
2129 /* Override pri if the frame isn't a QoS one */
2130 if (! IEEE80211_QOS_HAS_SEQ(wh))
2131 pri = ath_tx_getac(sc, m0);
2133 /* XXX If it's an ADDBA, override the correct queue */
2134 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2136 /* Map ADDBA to the correct priority */
2139 DPRINTF(sc, ATH_DEBUG_XMIT,
2140 "%s: overriding tid %d pri %d -> %d\n",
2141 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2143 pri = TID_TO_WME_AC(o_tid);
2146 /* Handle encryption twiddling if needed */
2147 if (! ath_tx_tag_crypto(sc, ni,
2148 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2149 &hdrlen, &pktlen, &keyix)) {
2153 /* packet header may have moved, reset our local pointer */
2154 wh = mtod(m0, struct ieee80211_frame *);
2156 /* Do the generic frame setup */
2157 /* XXX should just bzero the bf_state? */
2158 bf->bf_state.bfs_dobaw = 0;
2160 error = ath_tx_dmasetup(sc, bf, m0);
2163 m0 = bf->bf_m; /* NB: may have changed */
2164 wh = mtod(m0, struct ieee80211_frame *);
2165 bf->bf_node = ni; /* NB: held reference */
2167 /* Always enable CLRDMASK for raw frames for now.. */
2168 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2169 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2170 if (params->ibp_flags & IEEE80211_BPF_RTS)
2171 flags |= HAL_TXDESC_RTSENA;
2172 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2173 /* XXX assume 11g/11n protection? */
2174 bf->bf_state.bfs_doprot = 1;
2175 flags |= HAL_TXDESC_CTSENA;
2177 /* XXX leave ismcast to injector? */
2178 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2179 flags |= HAL_TXDESC_NOACK;
2181 rt = sc->sc_currates;
2182 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2183 rix = ath_tx_findrix(sc, params->ibp_rate0);
2184 txrate = rt->info[rix].rateCode;
2185 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2186 txrate |= rt->info[rix].shortPreamble;
2188 try0 = params->ibp_try0;
2189 ismrr = (params->ibp_try1 != 0);
2190 txantenna = params->ibp_pri >> 2;
2191 if (txantenna == 0) /* XXX? */
2192 txantenna = sc->sc_txantenna;
2195 * Since ctsrate is fixed, store it away for later
2196 * use when the descriptor fields are being set.
2198 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2199 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2202 * NB: we mark all packets as type PSPOLL so the h/w won't
2203 * set the sequence number, duration, etc.
2205 atype = HAL_PKT_TYPE_PSPOLL;
2207 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2208 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2209 sc->sc_hwmap[rix].ieeerate, -1);
2211 if (ieee80211_radiotap_active_vap(vap)) {
2212 u_int64_t tsf = ath_hal_gettsf64(ah);
2214 sc->sc_tx_th.wt_tsf = htole64(tsf);
2215 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2216 if (wh->i_fc[1] & IEEE80211_FC1_WEP)
2217 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2218 if (m0->m_flags & M_FRAG)
2219 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2220 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2221 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2222 ieee80211_get_node_txpower(ni));
2223 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2225 ieee80211_radiotap_tx(vap, m0);
2229 * Formulate first tx descriptor with tx controls.
2232 /* XXX check return value? */
2234 /* Store the decided rate index values away */
2235 bf->bf_state.bfs_pktlen = pktlen;
2236 bf->bf_state.bfs_hdrlen = hdrlen;
2237 bf->bf_state.bfs_atype = atype;
2238 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2239 ieee80211_get_node_txpower(ni));
2240 bf->bf_state.bfs_txrate0 = txrate;
2241 bf->bf_state.bfs_try0 = try0;
2242 bf->bf_state.bfs_keyix = keyix;
2243 bf->bf_state.bfs_txantenna = txantenna;
2244 bf->bf_state.bfs_txflags = flags;
2245 bf->bf_state.bfs_shpream =
2246 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2248 /* Set local packet state, used to queue packets to hardware */
2249 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2250 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2251 bf->bf_state.bfs_pri = pri;
2253 /* XXX this should be done in ath_tx_setrate() */
2254 bf->bf_state.bfs_ctsrate = 0;
2255 bf->bf_state.bfs_ctsduration = 0;
2256 bf->bf_state.bfs_ismrr = ismrr;
2258 /* Blank the legacy rate array */
2259 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2261 bf->bf_state.bfs_rc[0].rix =
2262 ath_tx_findrix(sc, params->ibp_rate0);
2263 bf->bf_state.bfs_rc[0].tries = try0;
2264 bf->bf_state.bfs_rc[0].ratecode = txrate;
2269 rix = ath_tx_findrix(sc, params->ibp_rate1);
2270 bf->bf_state.bfs_rc[1].rix = rix;
2271 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2273 rix = ath_tx_findrix(sc, params->ibp_rate2);
2274 bf->bf_state.bfs_rc[2].rix = rix;
2275 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2277 rix = ath_tx_findrix(sc, params->ibp_rate3);
2278 bf->bf_state.bfs_rc[3].rix = rix;
2279 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2282 * All the required rate control decisions have been made;
2283 * fill in the rc flags.
2285 ath_tx_rate_fill_rcflags(sc, bf);
2287 /* NB: no buffered multicast in power save support */
2290 * If we're overiding the ADDBA destination, dump directly
2291 * into the hardware queue, right after any pending
2292 * frames to that node are.
2294 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2295 __func__, do_override);
2299 * Put addba frames in the right place in the right TID/HWQ.
2302 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2304 * XXX if it's addba frames, should we be leaking
2305 * them out via the frame leak method?
2306 * XXX for now let's not risk it; but we may wish
2307 * to investigate this later.
2309 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2310 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2312 /* Queue to software queue */
2313 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2315 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2316 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2319 /* Direct-dispatch to the hardware */
2320 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2322 * Update the current leak count if
2323 * we're leaking frames; and set the
2324 * MORE flag as appropriate.
2326 ath_tx_leak_count_update(sc, tid, bf);
2327 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2335 * This can be called by net80211.
2338 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2339 const struct ieee80211_bpf_params *params)
2341 struct ieee80211com *ic = ni->ni_ic;
2342 struct ifnet *ifp = ic->ic_ifp;
2343 struct ath_softc *sc = ifp->if_softc;
2345 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2349 if (sc->sc_inreset_cnt > 0) {
2350 DPRINTF(sc, ATH_DEBUG_XMIT,
2351 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2356 sc->sc_txstart_cnt++;
2361 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || sc->sc_invalid) {
2362 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, %s", __func__,
2363 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ?
2364 "!running" : "invalid");
2371 * Enforce how deep the multicast queue can grow.
2373 * XXX duplicated in ath_tx_start().
2375 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2376 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2377 > sc->sc_txq_mcastq_maxdepth) {
2378 sc->sc_stats.ast_tx_mcastq_overflow++;
2389 * Grab a TX buffer and associated resources.
2391 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2393 sc->sc_stats.ast_tx_nobuf++;
2398 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2401 if (params == NULL) {
2403 * Legacy path; interpret frame contents to decide
2404 * precisely how to send the frame.
2406 if (ath_tx_start(sc, ni, bf, m)) {
2407 error = EIO; /* XXX */
2412 * Caller supplied explicit parameters to use in
2413 * sending the frame.
2415 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2416 error = EIO; /* XXX */
2420 sc->sc_wd_timer = 5;
2422 sc->sc_stats.ast_tx_raw++;
2425 * Update the TIM - if there's anything queued to the
2426 * software queue and power save is enabled, we should
2429 ath_tx_update_tim(sc, ni, 1);
2434 sc->sc_txstart_cnt--;
2439 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2445 ath_returnbuf_head(sc, bf);
2446 ATH_TXBUF_UNLOCK(sc);
2452 sc->sc_txstart_cnt--;
2455 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2458 sc->sc_stats.ast_tx_raw_fail++;
2459 ieee80211_free_node(ni);
2464 /* Some helper functions */
2467 * ADDBA (and potentially others) need to be placed in the same
2468 * hardware queue as the TID/node it's relating to. This is so
2469 * it goes out after any pending non-aggregate frames to the
2472 * If this isn't done, the ADDBA can go out before the frames
2473 * queued in hardware. Even though these frames have a sequence
2474 * number -earlier- than the ADDBA can be transmitted (but
2475 * no frames whose sequence numbers are after the ADDBA should
2476 * be!) they'll arrive after the ADDBA - and the receiving end
2477 * will simply drop them as being out of the BAW.
2479 * The frames can't be appended to the TID software queue - it'll
2480 * never be sent out. So these frames have to be directly
2481 * dispatched to the hardware, rather than queued in software.
2482 * So if this function returns true, the TXQ has to be
2483 * overridden and it has to be directly dispatched.
2485 * It's a dirty hack, but someone's gotta do it.
2489 * XXX doesn't belong here!
2492 ieee80211_is_action(struct ieee80211_frame *wh)
2494 /* Type: Management frame? */
2495 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2496 IEEE80211_FC0_TYPE_MGT)
2499 /* Subtype: Action frame? */
2500 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2501 IEEE80211_FC0_SUBTYPE_ACTION)
2507 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2509 * Return an alternate TID for ADDBA request frames.
2511 * Yes, this likely should be done in the net80211 layer.
2514 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2515 struct ieee80211_node *ni,
2516 struct mbuf *m0, int *tid)
2518 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2519 struct ieee80211_action_ba_addbarequest *ia;
2521 uint16_t baparamset;
2523 /* Not action frame? Bail */
2524 if (! ieee80211_is_action(wh))
2527 /* XXX Not needed for frames we send? */
2529 /* Correct length? */
2530 if (! ieee80211_parse_action(ni, m))
2534 /* Extract out action frame */
2535 frm = (u_int8_t *)&wh[1];
2536 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2538 /* Not ADDBA? Bail */
2539 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2541 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2544 /* Extract TID, return it */
2545 baparamset = le16toh(ia->rq_baparamset);
2546 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2552 /* Per-node software queue operations */
2555 * Add the current packet to the given BAW.
2556 * It is assumed that the current packet
2558 * + fits inside the BAW;
2559 * + already has had a sequence number allocated.
2561 * Since the BAW status may be modified by both the ath task and
2562 * the net80211/ifnet contexts, the TID must be locked.
2565 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2566 struct ath_tid *tid, struct ath_buf *bf)
2569 struct ieee80211_tx_ampdu *tap;
2571 ATH_TX_LOCK_ASSERT(sc);
2573 if (bf->bf_state.bfs_isretried)
2576 tap = ath_tx_get_tx_tid(an, tid->tid);
2578 if (! bf->bf_state.bfs_dobaw) {
2579 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2580 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2581 __func__, SEQNO(bf->bf_state.bfs_seqno),
2582 tap->txa_start, tap->txa_wnd);
2585 if (bf->bf_state.bfs_addedbaw)
2586 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2587 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2588 "baw head=%d tail=%d\n",
2589 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2590 tap->txa_start, tap->txa_wnd, tid->baw_head,
2594 * Verify that the given sequence number is not outside of the
2595 * BAW. Complain loudly if that's the case.
2597 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2598 SEQNO(bf->bf_state.bfs_seqno))) {
2599 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2600 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2601 "baw head=%d tail=%d\n",
2602 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2603 tap->txa_start, tap->txa_wnd, tid->baw_head,
2608 * ni->ni_txseqs[] is the currently allocated seqno.
2609 * the txa state contains the current baw start.
2611 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2612 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2613 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2614 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2615 "baw head=%d tail=%d\n",
2616 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2617 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2622 assert(tid->tx_buf[cindex] == NULL);
2624 if (tid->tx_buf[cindex] != NULL) {
2625 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2626 "%s: ba packet dup (index=%d, cindex=%d, "
2627 "head=%d, tail=%d)\n",
2628 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2629 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2630 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2632 tid->tx_buf[cindex],
2633 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2635 SEQNO(bf->bf_state.bfs_seqno)
2638 tid->tx_buf[cindex] = bf;
2640 if (index >= ((tid->baw_tail - tid->baw_head) &
2641 (ATH_TID_MAX_BUFS - 1))) {
2642 tid->baw_tail = cindex;
2643 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2648 * Flip the BAW buffer entry over from the existing one to the new one.
2650 * When software retransmitting a (sub-)frame, it is entirely possible that
2651 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2652 * In that instance the buffer is cloned and the new buffer is used for
2653 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2654 * tracking array to maintain consistency.
2657 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2658 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2661 struct ieee80211_tx_ampdu *tap;
2662 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2664 ATH_TX_LOCK_ASSERT(sc);
2666 tap = ath_tx_get_tx_tid(an, tid->tid);
2667 index = ATH_BA_INDEX(tap->txa_start, seqno);
2668 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2671 * Just warn for now; if it happens then we should find out
2672 * about it. It's highly likely the aggregation session will
2675 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2676 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2677 "%s: retransmitted buffer"
2678 " has mismatching seqno's, BA session may hang.\n",
2680 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2681 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2682 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2685 if (tid->tx_buf[cindex] != old_bf) {
2686 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2687 "%s: ath_buf pointer incorrect; "
2688 " has m BA session may hang.\n", __func__);
2689 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2690 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2693 tid->tx_buf[cindex] = new_bf;
2697 * seq_start - left edge of BAW
2698 * seq_next - current/next sequence number to allocate
2700 * Since the BAW status may be modified by both the ath task and
2701 * the net80211/ifnet contexts, the TID must be locked.
2704 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2705 struct ath_tid *tid, const struct ath_buf *bf)
2708 struct ieee80211_tx_ampdu *tap;
2709 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2711 ATH_TX_LOCK_ASSERT(sc);
2713 tap = ath_tx_get_tx_tid(an, tid->tid);
2714 index = ATH_BA_INDEX(tap->txa_start, seqno);
2715 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2717 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2718 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2719 "baw head=%d, tail=%d\n",
2720 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2721 cindex, tid->baw_head, tid->baw_tail);
2724 * If this occurs then we have a big problem - something else
2725 * has slid tap->txa_start along without updating the BAW
2726 * tracking start/end pointers. Thus the TX BAW state is now
2727 * completely busted.
2729 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2730 * it's quite possible that a cloned buffer is making its way
2731 * here and causing it to fire off. Disable TDMA for now.
2733 if (tid->tx_buf[cindex] != bf) {
2734 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2735 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2736 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2737 tid->tx_buf[cindex],
2738 (tid->tx_buf[cindex] != NULL) ?
2739 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2742 tid->tx_buf[cindex] = NULL;
2744 while (tid->baw_head != tid->baw_tail &&
2745 !tid->tx_buf[tid->baw_head]) {
2746 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2747 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2749 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2750 "%s: baw is now %d:%d, baw head=%d\n",
2751 __func__, tap->txa_start, tap->txa_wnd, tid->baw_head);
2755 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2758 struct ieee80211_frame *wh;
2760 ATH_TX_LOCK_ASSERT(sc);
2762 if (tid->an->an_leak_count > 0) {
2763 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2766 * Update MORE based on the software/net80211 queue states.
2768 if ((tid->an->an_stack_psq > 0)
2769 || (tid->an->an_swq_depth > 0))
2770 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2772 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2774 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2775 "%s: %6D: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2777 tid->an->an_node.ni_macaddr,
2779 tid->an->an_leak_count,
2780 tid->an->an_stack_psq,
2781 tid->an->an_swq_depth,
2782 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2785 * Re-sync the underlying buffer.
2787 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2788 BUS_DMASYNC_PREWRITE);
2790 tid->an->an_leak_count --;
2795 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2798 ATH_TX_LOCK_ASSERT(sc);
2800 if (tid->an->an_leak_count > 0) {
2809 * Mark the current node/TID as ready to TX.
2811 * This is done to make it easy for the software scheduler to
2812 * find which nodes have data to send.
2814 * The TXQ lock must be held.
2817 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2819 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2821 ATH_TX_LOCK_ASSERT(sc);
2824 * If we are leaking out a frame to this destination
2825 * for PS-POLL, ensure that we allow scheduling to
2828 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2829 return; /* paused, can't schedule yet */
2832 return; /* already scheduled */
2838 * If this is a sleeping node we're leaking to, given
2839 * it a higher priority. This is so bad for QoS it hurts.
2841 if (tid->an->an_leak_count) {
2842 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2844 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2849 * We can't do the above - it'll confuse the TXQ software
2850 * scheduler which will keep checking the _head_ TID
2851 * in the list to see if it has traffic. If we queue
2852 * a TID to the head of the list and it doesn't transmit,
2853 * we'll check it again.
2855 * So, get the rest of this leaking frames support working
2856 * and reliable first and _then_ optimise it so they're
2857 * pushed out in front of any other pending software
2860 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2864 * Mark the current node as no longer needing to be polled for
2867 * The TXQ lock must be held.
2870 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2872 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2874 ATH_TX_LOCK_ASSERT(sc);
2876 if (tid->sched == 0)
2880 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2884 * Assign a sequence number manually to the given frame.
2886 * This should only be called for A-MPDU TX frames.
2888 static ieee80211_seq
2889 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2890 struct ath_buf *bf, struct mbuf *m0)
2892 struct ieee80211_frame *wh;
2894 ieee80211_seq seqno;
2898 wh = mtod(m0, struct ieee80211_frame *);
2899 pri = M_WME_GETAC(m0); /* honor classification */
2900 tid = WME_AC_TO_TID(pri);
2901 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pri=%d, tid=%d, qos has seq=%d\n",
2902 __func__, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
2904 /* XXX Is it a control frame? Ignore */
2906 /* Does the packet require a sequence number? */
2907 if (! IEEE80211_QOS_HAS_SEQ(wh))
2910 ATH_TX_LOCK_ASSERT(sc);
2913 * Is it a QOS NULL Data frame? Give it a sequence number from
2914 * the default TID (IEEE80211_NONQOS_TID.)
2916 * The RX path of everything I've looked at doesn't include the NULL
2917 * data frame sequence number in the aggregation state updates, so
2918 * assigning it a sequence number there will cause a BAW hole on the
2921 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2922 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
2923 /* XXX no locking for this TID? This is a bit of a problem. */
2924 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
2925 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
2927 /* Manually assign sequence number */
2928 seqno = ni->ni_txseqs[tid];
2929 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
2931 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
2932 M_SEQNO_SET(m0, seqno);
2934 /* Return so caller can do something with it if needed */
2935 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: -> seqno=%d\n", __func__, seqno);
2940 * Attempt to direct dispatch an aggregate frame to hardware.
2941 * If the frame is out of BAW, queue.
2942 * Otherwise, schedule it as a single frame.
2945 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
2946 struct ath_txq *txq, struct ath_buf *bf)
2948 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
2949 struct ieee80211_tx_ampdu *tap;
2951 ATH_TX_LOCK_ASSERT(sc);
2953 tap = ath_tx_get_tx_tid(an, tid->tid);
2956 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
2957 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2958 /* XXX don't sched - we're paused! */
2962 /* outside baw? queue */
2963 if (bf->bf_state.bfs_dobaw &&
2964 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2965 SEQNO(bf->bf_state.bfs_seqno)))) {
2966 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2967 ath_tx_tid_sched(sc, tid);
2972 * This is a temporary check and should be removed once
2973 * all the relevant code paths have been fixed.
2975 * During aggregate retries, it's possible that the head
2976 * frame will fail (which has the bfs_aggr and bfs_nframes
2977 * fields set for said aggregate) and will be retried as
2978 * a single frame. In this instance, the values should
2979 * be reset or the completion code will get upset with you.
2981 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
2982 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
2983 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
2984 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
2985 bf->bf_state.bfs_aggr = 0;
2986 bf->bf_state.bfs_nframes = 1;
2989 /* Update CLRDMASK just before this frame is queued */
2990 ath_tx_update_clrdmask(sc, tid, bf);
2992 /* Direct dispatch to hardware */
2993 ath_tx_do_ratelookup(sc, bf);
2994 ath_tx_calc_duration(sc, bf);
2995 ath_tx_calc_protection(sc, bf);
2996 ath_tx_set_rtscts(sc, bf);
2997 ath_tx_rate_fill_rcflags(sc, bf);
2998 ath_tx_setds(sc, bf);
3001 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
3003 /* Track per-TID hardware queue depth correctly */
3007 if (bf->bf_state.bfs_dobaw) {
3008 ath_tx_addto_baw(sc, an, tid, bf);
3009 bf->bf_state.bfs_addedbaw = 1;
3012 /* Set completion handler, multi-frame aggregate or not */
3013 bf->bf_comp = ath_tx_aggr_comp;
3016 * Update the current leak count if
3017 * we're leaking frames; and set the
3018 * MORE flag as appropriate.
3020 ath_tx_leak_count_update(sc, tid, bf);
3022 /* Hand off to hardware */
3023 ath_tx_handoff(sc, txq, bf);
3027 * Attempt to send the packet.
3028 * If the queue isn't busy, direct-dispatch.
3029 * If the queue is busy enough, queue the given packet on the
3030 * relevant software queue.
3033 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3034 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3036 struct ath_node *an = ATH_NODE(ni);
3037 struct ieee80211_frame *wh;
3038 struct ath_tid *atid;
3040 struct mbuf *m0 = bf->bf_m;
3042 ATH_TX_LOCK_ASSERT(sc);
3044 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3045 wh = mtod(m0, struct ieee80211_frame *);
3046 pri = ath_tx_getac(sc, m0);
3047 tid = ath_tx_gettid(sc, m0);
3048 atid = &an->an_tid[tid];
3050 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3051 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3053 /* Set local packet state, used to queue packets to hardware */
3054 /* XXX potentially duplicate info, re-check */
3055 bf->bf_state.bfs_tid = tid;
3056 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3057 bf->bf_state.bfs_pri = pri;
3060 * If the hardware queue isn't busy, queue it directly.
3061 * If the hardware queue is busy, queue it.
3062 * If the TID is paused or the traffic it outside BAW, software
3065 * If the node is in power-save and we're leaking a frame,
3066 * leak a single frame.
3068 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3069 /* TID is paused, queue */
3070 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3072 * If the caller requested that it be sent at a high
3073 * priority, queue it at the head of the list.
3076 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3078 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3079 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3080 /* AMPDU pending; queue */
3081 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3082 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3084 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3085 /* AMPDU running, attempt direct dispatch if possible */
3088 * Always queue the frame to the tail of the list.
3090 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3093 * If the hardware queue isn't busy, direct dispatch
3094 * the head frame in the list. Don't schedule the
3095 * TID - let it build some more frames first?
3097 * When running A-MPDU, always just check the hardware
3098 * queue depth against the aggregate frame limit.
3099 * We don't want to burst a large number of single frames
3100 * out to the hardware; we want to aggressively hold back.
3102 * Otherwise, schedule the TID.
3104 /* XXX TXQ locking */
3105 if (txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_aggr) {
3106 bf = ATH_TID_FIRST(atid);
3107 ATH_TID_REMOVE(atid, bf, bf_list);
3110 * Ensure it's definitely treated as a non-AMPDU
3111 * frame - this information may have been left
3112 * over from a previous attempt.
3114 bf->bf_state.bfs_aggr = 0;
3115 bf->bf_state.bfs_nframes = 1;
3117 /* Queue to the hardware */
3118 ath_tx_xmit_aggr(sc, an, txq, bf);
3119 DPRINTF(sc, ATH_DEBUG_SW_TX,
3123 DPRINTF(sc, ATH_DEBUG_SW_TX,
3124 "%s: ampdu; swq'ing\n",
3127 ath_tx_tid_sched(sc, atid);
3130 * If we're not doing A-MPDU, be prepared to direct dispatch
3131 * up to both limits if possible. This particular corner
3132 * case may end up with packet starvation between aggregate
3133 * traffic and non-aggregate traffic: we wnat to ensure
3134 * that non-aggregate stations get a few frames queued to the
3135 * hardware before the aggregate station(s) get their chance.
3137 * So if you only ever see a couple of frames direct dispatched
3138 * to the hardware from a non-AMPDU client, check both here
3139 * and in the software queue dispatcher to ensure that those
3140 * non-AMPDU stations get a fair chance to transmit.
3142 /* XXX TXQ locking */
3143 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3144 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3145 /* AMPDU not running, attempt direct dispatch */
3146 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3147 /* See if clrdmask needs to be set */
3148 ath_tx_update_clrdmask(sc, atid, bf);
3151 * Update the current leak count if
3152 * we're leaking frames; and set the
3153 * MORE flag as appropriate.
3155 ath_tx_leak_count_update(sc, atid, bf);
3158 * Dispatch the frame.
3160 ath_tx_xmit_normal(sc, txq, bf);
3163 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3164 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3165 ath_tx_tid_sched(sc, atid);
3170 * Only set the clrdmask bit if none of the nodes are currently
3173 * XXX TODO: go through all the callers and check to see
3174 * which are being called in the context of looping over all
3175 * TIDs (eg, if all tids are being paused, resumed, etc.)
3176 * That'll avoid O(n^2) complexity here.
3179 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3183 ATH_TX_LOCK_ASSERT(sc);
3185 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3186 if (an->an_tid[i].isfiltered == 1)
3193 * Configure the per-TID node state.
3195 * This likely belongs in if_ath_node.c but I can't think of anywhere
3196 * else to put it just yet.
3198 * This sets up the SLISTs and the mutex as appropriate.
3201 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3204 struct ath_tid *atid;
3206 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3207 atid = &an->an_tid[i];
3209 /* XXX now with this bzer(), is the field 0'ing needed? */
3210 bzero(atid, sizeof(*atid));
3212 TAILQ_INIT(&atid->tid_q);
3213 TAILQ_INIT(&atid->filtq.tid_q);
3216 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3217 atid->tx_buf[j] = NULL;
3218 atid->baw_head = atid->baw_tail = 0;
3221 atid->hwq_depth = 0;
3222 atid->cleanup_inprogress = 0;
3223 if (i == IEEE80211_NONQOS_TID)
3224 atid->ac = ATH_NONQOS_TID_AC;
3226 atid->ac = TID_TO_WME_AC(i);
3228 an->clrdmask = 1; /* Always start by setting this bit */
3232 * Pause the current TID. This stops packets from being transmitted
3235 * Since this is also called from upper layers as well as the driver,
3236 * it will get the TID lock.
3239 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3242 ATH_TX_LOCK_ASSERT(sc);
3244 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: paused = %d\n",
3245 __func__, tid->paused);
3249 * Unpause the current TID, and schedule it if needed.
3252 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3254 ATH_TX_LOCK_ASSERT(sc);
3257 * There's some odd places where ath_tx_tid_resume() is called
3258 * when it shouldn't be; this works around that particular issue
3259 * until it's actually resolved.
3261 if (tid->paused == 0) {
3262 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3263 "%s: %6D: paused=0?\n", __func__,
3264 tid->an->an_node.ni_macaddr, ":");
3269 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: unpaused = %d\n",
3270 __func__, tid->paused);
3276 * Override the clrdmask configuration for the next frame
3277 * from this TID, just to get the ball rolling.
3279 ath_tx_set_clrdmask(sc, tid->an);
3281 if (tid->axq_depth == 0)
3284 /* XXX isfiltered shouldn't ever be 0 at this point */
3285 if (tid->isfiltered == 1) {
3286 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3291 ath_tx_tid_sched(sc, tid);
3294 * Queue the software TX scheduler.
3296 ath_tx_swq_kick(sc);
3300 * Add the given ath_buf to the TID filtered frame list.
3301 * This requires the TID be filtered.
3304 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3308 ATH_TX_LOCK_ASSERT(sc);
3310 if (!tid->isfiltered)
3311 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3314 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3316 /* Set the retry bit and bump the retry counter */
3317 ath_tx_set_retry(sc, bf);
3318 sc->sc_stats.ast_tx_swfiltered++;
3320 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3324 * Handle a completed filtered frame from the given TID.
3325 * This just enables/pauses the filtered frame state if required
3326 * and appends the filtered frame to the filtered queue.
3329 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3333 ATH_TX_LOCK_ASSERT(sc);
3335 if (! tid->isfiltered) {
3336 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: filter transition\n",
3338 tid->isfiltered = 1;
3339 ath_tx_tid_pause(sc, tid);
3342 /* Add the frame to the filter queue */
3343 ath_tx_tid_filt_addbuf(sc, tid, bf);
3347 * Complete the filtered frame TX completion.
3349 * If there are no more frames in the hardware queue, unpause/unfilter
3350 * the TID if applicable. Otherwise we will wait for a node PS transition
3354 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3358 ATH_TX_LOCK_ASSERT(sc);
3360 if (tid->hwq_depth != 0)
3363 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: hwq=0, transition back\n",
3365 tid->isfiltered = 0;
3366 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3367 ath_tx_set_clrdmask(sc, tid->an);
3369 /* XXX this is really quite inefficient */
3370 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3371 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3372 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3375 ath_tx_tid_resume(sc, tid);
3379 * Called when a single (aggregate or otherwise) frame is completed.
3381 * Returns 1 if the buffer could be added to the filtered list
3382 * (cloned or otherwise), 0 if the buffer couldn't be added to the
3383 * filtered list (failed clone; expired retry) and the caller should
3384 * free it and handle it like a failure (eg by sending a BAR.)
3387 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3390 struct ath_buf *nbf;
3393 ATH_TX_LOCK_ASSERT(sc);
3396 * Don't allow a filtered frame to live forever.
3398 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3399 sc->sc_stats.ast_tx_swretrymax++;
3400 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3401 "%s: bf=%p, seqno=%d, exceeded retries\n",
3404 bf->bf_state.bfs_seqno);
3409 * A busy buffer can't be added to the retry list.
3410 * It needs to be cloned.
3412 if (bf->bf_flags & ATH_BUF_BUSY) {
3413 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3414 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3415 "%s: busy buffer clone: %p -> %p\n",
3422 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3423 "%s: busy buffer couldn't be cloned (%p)!\n",
3427 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3430 ath_tx_tid_filt_comp_complete(sc, tid);
3436 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3437 struct ath_buf *bf_first, ath_bufhead *bf_q)
3439 struct ath_buf *bf, *bf_next, *nbf;
3441 ATH_TX_LOCK_ASSERT(sc);
3445 bf_next = bf->bf_next;
3446 bf->bf_next = NULL; /* Remove it from the aggr list */
3449 * Don't allow a filtered frame to live forever.
3451 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3452 sc->sc_stats.ast_tx_swretrymax++;
3453 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3454 "%s: bf=%p, seqno=%d, exceeded retries\n",
3457 bf->bf_state.bfs_seqno);
3458 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3462 if (bf->bf_flags & ATH_BUF_BUSY) {
3463 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3464 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3465 "%s: busy buffer cloned: %p -> %p",
3472 * If the buffer couldn't be cloned, add it to bf_q;
3473 * the caller will free the buffer(s) as required.
3476 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3477 "%s: buffer couldn't be cloned! (%p)\n",
3479 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3481 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3487 ath_tx_tid_filt_comp_complete(sc, tid);
3491 * Suspend the queue because we need to TX a BAR.
3494 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3497 ATH_TX_LOCK_ASSERT(sc);
3499 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3500 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3506 /* We shouldn't be called when bar_tx is 1 */
3508 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3509 "%s: bar_tx is 1?!\n", __func__);
3512 /* If we've already been called, just be patient. */
3519 /* Only one pause, no matter how many frames fail */
3520 ath_tx_tid_pause(sc, tid);
3524 * We've finished with BAR handling - either we succeeded or
3525 * failed. Either way, unsuspend TX.
3528 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3531 ATH_TX_LOCK_ASSERT(sc);
3533 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3534 "%s: %6D: TID=%d, called\n",
3536 tid->an->an_node.ni_macaddr,
3540 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3541 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3542 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3543 __func__, tid->an->an_node.ni_macaddr, ":",
3544 tid->tid, tid->bar_tx, tid->bar_wait);
3547 tid->bar_tx = tid->bar_wait = 0;
3548 ath_tx_tid_resume(sc, tid);
3552 * Return whether we're ready to TX a BAR frame.
3554 * Requires the TID lock be held.
3557 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3560 ATH_TX_LOCK_ASSERT(sc);
3562 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3565 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3566 "%s: %6D: TID=%d, bar ready\n",
3568 tid->an->an_node.ni_macaddr,
3576 * Check whether the current TID is ready to have a BAR
3577 * TXed and if so, do the TX.
3579 * Since the TID/TXQ lock can't be held during a call to
3580 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3581 * sending the BAR and locking it again.
3583 * Eventually, the code to send the BAR should be broken out
3584 * from this routine so the lock doesn't have to be reacquired
3585 * just to be immediately dropped by the caller.
3588 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3590 struct ieee80211_tx_ampdu *tap;
3592 ATH_TX_LOCK_ASSERT(sc);
3594 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3595 "%s: %6D: TID=%d, called\n",
3597 tid->an->an_node.ni_macaddr,
3601 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3604 * This is an error condition!
3606 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3607 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3608 "%s: %6D: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3609 __func__, tid->an->an_node.ni_macaddr, ":",
3610 tid->tid, tid->bar_tx, tid->bar_wait);
3614 /* Don't do anything if we still have pending frames */
3615 if (tid->hwq_depth > 0) {
3616 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3617 "%s: %6D: TID=%d, hwq_depth=%d, waiting\n",
3619 tid->an->an_node.ni_macaddr,
3626 /* We're now about to TX */
3630 * Override the clrdmask configuration for the next frame,
3631 * just to get the ball rolling.
3633 ath_tx_set_clrdmask(sc, tid->an);
3636 * Calculate new BAW left edge, now that all frames have either
3637 * succeeded or failed.
3639 * XXX verify this is _actually_ the valid value to begin at!
3641 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3642 "%s: %6D: TID=%d, new BAW left edge=%d\n",
3644 tid->an->an_node.ni_macaddr,
3649 /* Try sending the BAR frame */
3650 /* We can't hold the lock here! */
3653 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3654 /* Success? Now we wait for notification that it's done */
3659 /* Failure? For now, warn loudly and continue */
3661 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3662 "%s: %6D: TID=%d, failed to TX BAR, continue!\n",
3663 __func__, tid->an->an_node.ni_macaddr, ":",
3665 ath_tx_tid_bar_unsuspend(sc, tid);
3669 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3670 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3673 ATH_TX_LOCK_ASSERT(sc);
3676 * If the current TID is running AMPDU, update
3679 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3680 bf->bf_state.bfs_dobaw) {
3682 * Only remove the frame from the BAW if it's
3683 * been transmitted at least once; this means
3684 * the frame was in the BAW to begin with.
3686 if (bf->bf_state.bfs_retries > 0) {
3687 ath_tx_update_baw(sc, an, tid, bf);
3688 bf->bf_state.bfs_dobaw = 0;
3692 * This has become a non-fatal error now
3694 if (! bf->bf_state.bfs_addedbaw)
3695 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3696 "%s: wasn't added: seqno %d\n",
3697 __func__, SEQNO(bf->bf_state.bfs_seqno));
3701 /* Strip it out of an aggregate list if it was in one */
3704 /* Insert on the free queue to be freed by the caller */
3705 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3709 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3710 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3712 struct ieee80211_node *ni = &an->an_node;
3713 struct ath_txq *txq;
3714 struct ieee80211_tx_ampdu *tap;
3716 txq = sc->sc_ac2q[tid->ac];
3717 tap = ath_tx_get_tx_tid(an, tid->tid);
3719 DPRINTF(sc, ATH_DEBUG_SW_TX,
3720 "%s: %s: %6D: bf=%p: addbaw=%d, dobaw=%d, "
3721 "seqno=%d, retry=%d\n",
3727 bf->bf_state.bfs_addedbaw,
3728 bf->bf_state.bfs_dobaw,
3729 SEQNO(bf->bf_state.bfs_seqno),
3730 bf->bf_state.bfs_retries);
3731 DPRINTF(sc, ATH_DEBUG_SW_TX,
3732 "%s: %s: %6D: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3740 txq->axq_aggr_depth);
3741 DPRINTF(sc, ATH_DEBUG_SW_TX,
3742 "%s: %s: %6D: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3753 DPRINTF(sc, ATH_DEBUG_SW_TX,
3754 "%s: %s: %6D: tid %d: "
3755 "sched=%d, paused=%d, "
3756 "incomp=%d, baw_head=%d, "
3757 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3763 tid->sched, tid->paused,
3764 tid->incomp, tid->baw_head,
3765 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3766 ni->ni_txseqs[tid->tid]);
3768 /* XXX Dump the frame, see what it is? */
3769 ieee80211_dump_pkt(ni->ni_ic,
3770 mtod(bf->bf_m, const uint8_t *),
3771 bf->bf_m->m_len, 0, -1);
3775 * Free any packets currently pending in the software TX queue.
3777 * This will be called when a node is being deleted.
3779 * It can also be called on an active node during an interface
3780 * reset or state transition.
3782 * (From Linux/reference):
3784 * TODO: For frame(s) that are in the retry state, we will reuse the
3785 * sequence number(s) without setting the retry bit. The
3786 * alternative is to give up on these and BAR the receiver's window
3790 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3791 struct ath_tid *tid, ath_bufhead *bf_cq)
3794 struct ieee80211_tx_ampdu *tap;
3795 struct ieee80211_node *ni = &an->an_node;
3798 tap = ath_tx_get_tx_tid(an, tid->tid);
3800 ATH_TX_LOCK_ASSERT(sc);
3802 /* Walk the queue, free frames */
3805 bf = ATH_TID_FIRST(tid);
3811 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3815 ATH_TID_REMOVE(tid, bf, bf_list);
3816 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3819 /* And now, drain the filtered frame queue */
3822 bf = ATH_TID_FILT_FIRST(tid);
3827 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3831 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3832 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3836 * Override the clrdmask configuration for the next frame
3837 * in case there is some future transmission, just to get
3840 * This won't hurt things if the TID is about to be freed.
3842 ath_tx_set_clrdmask(sc, tid->an);
3845 * Now that it's completed, grab the TID lock and update
3846 * the sequence number and BAW window.
3847 * Because sequence numbers have been assigned to frames
3848 * that haven't been sent yet, it's entirely possible
3849 * we'll be called with some pending frames that have not
3852 * The cleaner solution is to do the sequence number allocation
3853 * when the packet is first transmitted - and thus the "retries"
3854 * check above would be enough to update the BAW/seqno.
3857 /* But don't do it for non-QoS TIDs */
3860 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3861 "%s: %6D: node %p: TID %d: sliding BAW left edge to %d\n",
3869 ni->ni_txseqs[tid->tid] = tap->txa_start;
3870 tid->baw_tail = tid->baw_head;
3875 * Reset the TID state. This must be only called once the node has
3876 * had its frames flushed from this TID, to ensure that no other
3877 * pause / unpause logic can kick in.
3880 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
3884 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
3885 tid->paused = tid->sched = tid->addba_tx_pending = 0;
3886 tid->incomp = tid->cleanup_inprogress = 0;
3890 * If we have a bar_wait set, we need to unpause the TID
3891 * here. Otherwise once cleanup has finished, the TID won't
3892 * have the right paused counter.
3894 * XXX I'm not going through resume here - I don't want the
3895 * node to be rescheuled just yet. This however should be
3898 if (tid->bar_wait) {
3899 if (tid->paused > 0) {
3905 * XXX same with a currently filtered TID.
3907 * Since this is being called during a flush, we assume that
3908 * the filtered frame list is actually empty.
3910 * XXX TODO: add in a check to ensure that the filtered queue
3911 * depth is actually 0!
3913 if (tid->isfiltered) {
3914 if (tid->paused > 0) {
3920 * Clear BAR, filtered frames, scheduled and ADDBA pending.
3921 * The TID may be going through cleanup from the last association
3922 * where things in the BAW are still in the hardware queue.
3926 tid->isfiltered = 0;
3928 tid->addba_tx_pending = 0;
3931 * XXX TODO: it may just be enough to walk the HWQs and mark
3932 * frames for that node as non-aggregate; or mark the ath_node
3933 * with something that indicates that aggregation is no longer
3934 * occuring. Then we can just toss the BAW complaints and
3935 * do a complete hard reset of state here - no pause, no
3936 * complete counter, etc.
3942 * Flush all software queued packets for the given node.
3944 * This occurs when a completion handler frees the last buffer
3945 * for a node, and the node is thus freed. This causes the node
3946 * to be cleaned up, which ends up calling ath_tx_node_flush.
3949 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
3957 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
3961 DPRINTF(sc, ATH_DEBUG_NODE,
3962 "%s: %6D: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
3963 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
3965 an->an_node.ni_macaddr,
3967 an->an_is_powersave,
3974 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
3975 struct ath_tid *atid = &an->an_tid[tid];
3978 ath_tx_tid_drain(sc, an, atid, &bf_cq);
3980 /* Remove this tid from the list of active tids */
3981 ath_tx_tid_unsched(sc, atid);
3983 /* Reset the per-TID pause, BAR, etc state */
3984 ath_tx_tid_reset(sc, atid);
3988 * Clear global leak count
3990 an->an_leak_count = 0;
3993 /* Handle completed frames */
3994 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
3995 TAILQ_REMOVE(&bf_cq, bf, bf_list);
3996 ath_tx_default_comp(sc, bf, 0);
4001 * Drain all the software TXQs currently with traffic queued.
4004 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
4006 struct ath_tid *tid;
4014 * Iterate over all active tids for the given txq,
4015 * flushing and unsched'ing them
4017 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
4018 tid = TAILQ_FIRST(&txq->axq_tidq);
4019 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
4020 ath_tx_tid_unsched(sc, tid);
4025 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4026 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4027 ath_tx_default_comp(sc, bf, 0);
4032 * Handle completion of non-aggregate session frames.
4034 * This (currently) doesn't implement software retransmission of
4035 * non-aggregate frames!
4037 * Software retransmission of non-aggregate frames needs to obey
4038 * the strict sequence number ordering, and drop any frames that
4041 * For now, filtered frames and frame transmission will cause
4042 * all kinds of issues. So we don't support them.
4044 * So anyone queuing frames via ath_tx_normal_xmit() or
4045 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4048 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4050 struct ieee80211_node *ni = bf->bf_node;
4051 struct ath_node *an = ATH_NODE(ni);
4052 int tid = bf->bf_state.bfs_tid;
4053 struct ath_tid *atid = &an->an_tid[tid];
4054 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4056 /* The TID state is protected behind the TXQ lock */
4059 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4060 __func__, bf, fail, atid->hwq_depth - 1);
4066 * If the frame was filtered, stick it on the filter frame
4067 * queue and complain about it. It shouldn't happen!
4069 if ((ts->ts_status & HAL_TXERR_FILT) ||
4070 (ts->ts_status != 0 && atid->isfiltered)) {
4071 DPRINTF(sc, ATH_DEBUG_SW_TX,
4072 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4076 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4079 if (atid->isfiltered)
4080 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4081 if (atid->hwq_depth < 0)
4082 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4083 __func__, atid->hwq_depth);
4086 * If the queue is filtered, potentially mark it as complete
4087 * and reschedule it as needed.
4089 * This is required as there may be a subsequent TX descriptor
4090 * for this end-node that has CLRDMASK set, so it's quite possible
4091 * that a filtered frame will be followed by a non-filtered
4092 * (complete or otherwise) frame.
4094 * XXX should we do this before we complete the frame?
4096 if (atid->isfiltered)
4097 ath_tx_tid_filt_comp_complete(sc, atid);
4101 * punt to rate control if we're not being cleaned up
4102 * during a hw queue drain and the frame wanted an ACK.
4104 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4105 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4106 ts, bf->bf_state.bfs_pktlen,
4107 1, (ts->ts_status == 0) ? 0 : 1);
4109 ath_tx_default_comp(sc, bf, fail);
4113 * Handle cleanup of aggregate session packets that aren't
4116 * There's no need to update the BAW here - the session is being
4120 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4122 struct ieee80211_node *ni = bf->bf_node;
4123 struct ath_node *an = ATH_NODE(ni);
4124 int tid = bf->bf_state.bfs_tid;
4125 struct ath_tid *atid = &an->an_tid[tid];
4127 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4128 __func__, tid, atid->incomp);
4132 if (atid->incomp == 0) {
4133 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4134 "%s: TID %d: cleaned up! resume!\n",
4136 atid->cleanup_inprogress = 0;
4137 ath_tx_tid_resume(sc, atid);
4141 ath_tx_default_comp(sc, bf, 0);
4145 * Performs transmit side cleanup when TID changes from aggregated to
4148 * - Discard all retry frames from the s/w queue.
4149 * - Fix the tx completion function for all buffers in s/w queue.
4150 * - Count the number of unacked frames, and let transmit completion
4153 * The caller is responsible for pausing the TID and unpausing the
4154 * TID if no cleanup was required. Otherwise the cleanup path will
4155 * unpause the TID once the last hardware queued frame is completed.
4158 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4161 struct ath_tid *atid = &an->an_tid[tid];
4162 struct ieee80211_tx_ampdu *tap;
4163 struct ath_buf *bf, *bf_next;
4165 ATH_TX_LOCK_ASSERT(sc);
4167 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4168 "%s: TID %d: called\n", __func__, tid);
4171 * Move the filtered frames to the TX queue, before
4172 * we run off and discard/process things.
4174 /* XXX this is really quite inefficient */
4175 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4176 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4177 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4181 * Update the frames in the software TX queue:
4183 * + Discard retry frames in the queue
4184 * + Fix the completion function to be non-aggregate
4186 bf = ATH_TID_FIRST(atid);
4188 if (bf->bf_state.bfs_isretried) {
4189 bf_next = TAILQ_NEXT(bf, bf_list);
4190 ATH_TID_REMOVE(atid, bf, bf_list);
4191 if (bf->bf_state.bfs_dobaw) {
4192 ath_tx_update_baw(sc, an, atid, bf);
4193 if (!bf->bf_state.bfs_addedbaw)
4194 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4195 "%s: wasn't added: seqno %d\n",
4197 SEQNO(bf->bf_state.bfs_seqno));
4199 bf->bf_state.bfs_dobaw = 0;
4201 * Call the default completion handler with "fail" just
4202 * so upper levels are suitably notified about this.
4204 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4208 /* Give these the default completion handler */
4209 bf->bf_comp = ath_tx_normal_comp;
4210 bf = TAILQ_NEXT(bf, bf_list);
4214 * Calculate what hardware-queued frames exist based
4215 * on the current BAW size. Ie, what frames have been
4216 * added to the TX hardware queue for this TID but
4219 tap = ath_tx_get_tx_tid(an, tid);
4220 /* Need the lock - fiddling with BAW */
4221 while (atid->baw_head != atid->baw_tail) {
4222 if (atid->tx_buf[atid->baw_head]) {
4224 atid->cleanup_inprogress = 1;
4225 atid->tx_buf[atid->baw_head] = NULL;
4227 INCR(atid->baw_head, ATH_TID_MAX_BUFS);
4228 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
4231 if (atid->cleanup_inprogress)
4232 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4233 "%s: TID %d: cleanup needed: %d packets\n",
4234 __func__, tid, atid->incomp);
4236 /* Owner now must free completed frames */
4239 static struct ath_buf *
4240 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4241 struct ath_tid *tid, struct ath_buf *bf)
4243 struct ath_buf *nbf;
4247 * Clone the buffer. This will handle the dma unmap and
4248 * copy the node reference to the new buffer. If this
4249 * works out, 'bf' will have no DMA mapping, no mbuf
4250 * pointer and no node reference.
4252 nbf = ath_buf_clone(sc, bf);
4255 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4260 /* Failed to clone */
4261 DPRINTF(sc, ATH_DEBUG_XMIT,
4262 "%s: failed to clone a busy buffer\n",
4267 /* Setup the dma for the new buffer */
4268 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4270 DPRINTF(sc, ATH_DEBUG_XMIT,
4271 "%s: failed to setup dma for clone\n",
4274 * Put this at the head of the list, not tail;
4275 * that way it doesn't interfere with the
4276 * busy buffer logic (which uses the tail of
4280 ath_returnbuf_head(sc, nbf);
4281 ATH_TXBUF_UNLOCK(sc);
4285 /* Update BAW if required, before we free the original buf */
4286 if (bf->bf_state.bfs_dobaw)
4287 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4289 /* Free original buffer; return new buffer */
4290 ath_freebuf(sc, bf);
4296 * Handle retrying an unaggregate frame in an aggregate
4299 * If too many retries occur, pause the TID, wait for
4300 * any further retransmits (as there's no reason why
4301 * non-aggregate frames in an aggregate session are
4302 * transmitted in-order; they just have to be in-BAW)
4303 * and then queue a BAR.
4306 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4308 struct ieee80211_node *ni = bf->bf_node;
4309 struct ath_node *an = ATH_NODE(ni);
4310 int tid = bf->bf_state.bfs_tid;
4311 struct ath_tid *atid = &an->an_tid[tid];
4312 struct ieee80211_tx_ampdu *tap;
4316 tap = ath_tx_get_tx_tid(an, tid);
4319 * If the buffer is marked as busy, we can't directly
4320 * reuse it. Instead, try to clone the buffer.
4321 * If the clone is successful, recycle the old buffer.
4322 * If the clone is unsuccessful, set bfs_retries to max
4323 * to force the next bit of code to free the buffer
4326 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4327 (bf->bf_flags & ATH_BUF_BUSY)) {
4328 struct ath_buf *nbf;
4329 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4331 /* bf has been freed at this point */
4334 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4337 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4338 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4339 "%s: exceeded retries; seqno %d\n",
4340 __func__, SEQNO(bf->bf_state.bfs_seqno));
4341 sc->sc_stats.ast_tx_swretrymax++;
4343 /* Update BAW anyway */
4344 if (bf->bf_state.bfs_dobaw) {
4345 ath_tx_update_baw(sc, an, atid, bf);
4346 if (! bf->bf_state.bfs_addedbaw)
4347 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4348 "%s: wasn't added: seqno %d\n",
4349 __func__, SEQNO(bf->bf_state.bfs_seqno));
4351 bf->bf_state.bfs_dobaw = 0;
4353 /* Suspend the TX queue and get ready to send the BAR */
4354 ath_tx_tid_bar_suspend(sc, atid);
4356 /* Send the BAR if there are no other frames waiting */
4357 if (ath_tx_tid_bar_tx_ready(sc, atid))
4358 ath_tx_tid_bar_tx(sc, atid);
4362 /* Free buffer, bf is free after this call */
4363 ath_tx_default_comp(sc, bf, 0);
4368 * This increments the retry counter as well as
4369 * sets the retry flag in the ath_buf and packet
4372 ath_tx_set_retry(sc, bf);
4373 sc->sc_stats.ast_tx_swretries++;
4376 * Insert this at the head of the queue, so it's
4377 * retried before any current/subsequent frames.
4379 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4380 ath_tx_tid_sched(sc, atid);
4381 /* Send the BAR if there are no other frames waiting */
4382 if (ath_tx_tid_bar_tx_ready(sc, atid))
4383 ath_tx_tid_bar_tx(sc, atid);
4389 * Common code for aggregate excessive retry/subframe retry.
4390 * If retrying, queues buffers to bf_q. If not, frees the
4393 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4396 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4399 struct ieee80211_node *ni = bf->bf_node;
4400 struct ath_node *an = ATH_NODE(ni);
4401 int tid = bf->bf_state.bfs_tid;
4402 struct ath_tid *atid = &an->an_tid[tid];
4404 ATH_TX_LOCK_ASSERT(sc);
4406 /* XXX clr11naggr should be done for all subframes */
4407 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4408 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4410 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4413 * If the buffer is marked as busy, we can't directly
4414 * reuse it. Instead, try to clone the buffer.
4415 * If the clone is successful, recycle the old buffer.
4416 * If the clone is unsuccessful, set bfs_retries to max
4417 * to force the next bit of code to free the buffer
4420 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4421 (bf->bf_flags & ATH_BUF_BUSY)) {
4422 struct ath_buf *nbf;
4423 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4425 /* bf has been freed at this point */
4428 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4431 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4432 sc->sc_stats.ast_tx_swretrymax++;
4433 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4434 "%s: max retries: seqno %d\n",
4435 __func__, SEQNO(bf->bf_state.bfs_seqno));
4436 ath_tx_update_baw(sc, an, atid, bf);
4437 if (!bf->bf_state.bfs_addedbaw)
4438 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4439 "%s: wasn't added: seqno %d\n",
4440 __func__, SEQNO(bf->bf_state.bfs_seqno));
4441 bf->bf_state.bfs_dobaw = 0;
4445 ath_tx_set_retry(sc, bf);
4446 sc->sc_stats.ast_tx_swretries++;
4447 bf->bf_next = NULL; /* Just to make sure */
4449 /* Clear the aggregate state */
4450 bf->bf_state.bfs_aggr = 0;
4451 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4452 bf->bf_state.bfs_nframes = 1;
4454 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4459 * error pkt completion for an aggregate destination
4462 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4463 struct ath_tid *tid)
4465 struct ieee80211_node *ni = bf_first->bf_node;
4466 struct ath_node *an = ATH_NODE(ni);
4467 struct ath_buf *bf_next, *bf;
4470 struct ieee80211_tx_ampdu *tap;
4477 * Update rate control - all frames have failed.
4479 * XXX use the length in the first frame in the series;
4480 * XXX just so things are consistent for now.
4482 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4483 &bf_first->bf_status.ds_txstat,
4484 bf_first->bf_state.bfs_pktlen,
4485 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4488 tap = ath_tx_get_tx_tid(an, tid->tid);
4489 sc->sc_stats.ast_tx_aggr_failall++;
4491 /* Retry all subframes */
4494 bf_next = bf->bf_next;
4495 bf->bf_next = NULL; /* Remove it from the aggr list */
4496 sc->sc_stats.ast_tx_aggr_fail++;
4497 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4500 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4505 /* Prepend all frames to the beginning of the queue */
4506 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4507 TAILQ_REMOVE(&bf_q, bf, bf_list);
4508 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4512 * Schedule the TID to be re-tried.
4514 ath_tx_tid_sched(sc, tid);
4517 * send bar if we dropped any frames
4519 * Keep the txq lock held for now, as we need to ensure
4520 * that ni_txseqs[] is consistent (as it's being updated
4521 * in the ifnet TX context or raw TX context.)
4524 /* Suspend the TX queue and get ready to send the BAR */
4525 ath_tx_tid_bar_suspend(sc, tid);
4529 * Send BAR if required
4531 if (ath_tx_tid_bar_tx_ready(sc, tid))
4532 ath_tx_tid_bar_tx(sc, tid);
4536 /* Complete frames which errored out */
4537 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4538 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4539 ath_tx_default_comp(sc, bf, 0);
4544 * Handle clean-up of packets from an aggregate list.
4546 * There's no need to update the BAW here - the session is being
4550 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4552 struct ath_buf *bf, *bf_next;
4553 struct ieee80211_node *ni = bf_first->bf_node;
4554 struct ath_node *an = ATH_NODE(ni);
4555 int tid = bf_first->bf_state.bfs_tid;
4556 struct ath_tid *atid = &an->an_tid[tid];
4567 if (atid->incomp == 0) {
4568 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4569 "%s: TID %d: cleaned up! resume!\n",
4571 atid->cleanup_inprogress = 0;
4572 ath_tx_tid_resume(sc, atid);
4575 /* Send BAR if required */
4576 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4578 * XXX TODO: we should likely just tear down the BAR state here,
4579 * rather than sending a BAR.
4581 if (ath_tx_tid_bar_tx_ready(sc, atid))
4582 ath_tx_tid_bar_tx(sc, atid);
4586 /* Handle frame completion */
4589 bf_next = bf->bf_next;
4590 ath_tx_default_comp(sc, bf, 1);
4596 * Handle completion of an set of aggregate frames.
4598 * Note: the completion handler is the last descriptor in the aggregate,
4599 * not the last descriptor in the first frame.
4602 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4605 //struct ath_desc *ds = bf->bf_lastds;
4606 struct ieee80211_node *ni = bf_first->bf_node;
4607 struct ath_node *an = ATH_NODE(ni);
4608 int tid = bf_first->bf_state.bfs_tid;
4609 struct ath_tid *atid = &an->an_tid[tid];
4610 struct ath_tx_status ts;
4611 struct ieee80211_tx_ampdu *tap;
4617 struct ath_buf *bf, *bf_next;
4620 int nframes = 0, nbad = 0, nf;
4622 /* XXX there's too much on the stack? */
4623 struct ath_rc_series rc[ATH_RC_NUM];
4626 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4627 __func__, atid->hwq_depth);
4630 * Take a copy; this may be needed -after- bf_first
4631 * has been completed and freed.
4633 ts = bf_first->bf_status.ds_txstat;
4638 /* The TID state is kept behind the TXQ lock */
4642 if (atid->hwq_depth < 0)
4643 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4644 __func__, atid->hwq_depth);
4647 * If the TID is filtered, handle completing the filter
4648 * transition before potentially kicking it to the cleanup
4651 * XXX this is duplicate work, ew.
4653 if (atid->isfiltered)
4654 ath_tx_tid_filt_comp_complete(sc, atid);
4657 * Punt cleanup to the relevant function, not our problem now
4659 if (atid->cleanup_inprogress) {
4660 if (atid->isfiltered)
4661 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4662 "%s: isfiltered=1, normal_comp?\n",
4665 ath_tx_comp_cleanup_aggr(sc, bf_first);
4670 * If the frame is filtered, transition to filtered frame
4671 * mode and add this to the filtered frame list.
4673 * XXX TODO: figure out how this interoperates with
4674 * BAR, pause and cleanup states.
4676 if ((ts.ts_status & HAL_TXERR_FILT) ||
4677 (ts.ts_status != 0 && atid->isfiltered)) {
4679 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4680 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4681 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4683 /* Remove from BAW */
4684 TAILQ_FOREACH_SAFE(bf, &bf_cq, bf_list, bf_next) {
4685 if (bf->bf_state.bfs_addedbaw)
4687 if (bf->bf_state.bfs_dobaw) {
4688 ath_tx_update_baw(sc, an, atid, bf);
4689 if (!bf->bf_state.bfs_addedbaw)
4690 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4691 "%s: wasn't added: seqno %d\n",
4693 SEQNO(bf->bf_state.bfs_seqno));
4695 bf->bf_state.bfs_dobaw = 0;
4698 * If any intermediate frames in the BAW were dropped when
4699 * handling filtering things, send a BAR.
4702 ath_tx_tid_bar_suspend(sc, atid);
4705 * Finish up by sending a BAR if required and freeing
4706 * the frames outside of the TX lock.
4708 goto finish_send_bar;
4712 * XXX for now, use the first frame in the aggregate for
4713 * XXX rate control completion; it's at least consistent.
4715 pktlen = bf_first->bf_state.bfs_pktlen;
4718 * Handle errors first!
4720 * Here, handle _any_ error as a "exceeded retries" error.
4721 * Later on (when filtered frames are to be specially handled)
4722 * it'll have to be expanded.
4725 if (ts.ts_status & HAL_TXERR_XRETRY) {
4727 if (ts.ts_status != 0) {
4729 ath_tx_comp_aggr_error(sc, bf_first, atid);
4733 tap = ath_tx_get_tx_tid(an, tid);
4736 * extract starting sequence and block-ack bitmap
4738 /* XXX endian-ness of seq_st, ba? */
4739 seq_st = ts.ts_seqnum;
4740 hasba = !! (ts.ts_flags & HAL_TX_BA);
4741 tx_ok = (ts.ts_status == 0);
4742 isaggr = bf_first->bf_state.bfs_aggr;
4743 ba[0] = ts.ts_ba_low;
4744 ba[1] = ts.ts_ba_high;
4747 * Copy the TX completion status and the rate control
4748 * series from the first descriptor, as it may be freed
4749 * before the rate control code can get its grubby fingers
4752 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4754 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4755 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4756 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4757 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4758 isaggr, seq_st, hasba, ba[0], ba[1]);
4761 * The reference driver doesn't do this; it simply ignores
4762 * this check in its entirety.
4764 * I've seen this occur when using iperf to send traffic
4765 * out tid 1 - the aggregate frames are all marked as TID 1,
4766 * but the TXSTATUS has TID=0. So, let's just ignore this
4770 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4771 if (tid != ts.ts_tid) {
4772 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4773 __func__, tid, ts.ts_tid);
4778 /* AR5416 BA bug; this requires an interface reset */
4779 if (isaggr && tx_ok && (! hasba)) {
4780 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4781 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
4783 __func__, hasba, tx_ok, isaggr, seq_st);
4784 /* XXX TODO: schedule an interface reset */
4786 ath_printtxbuf(sc, bf_first,
4787 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
4792 * Walk the list of frames, figure out which ones were correctly
4793 * sent and which weren't.
4796 nf = bf_first->bf_state.bfs_nframes;
4798 /* bf_first is going to be invalid once this list is walked */
4802 * Walk the list of completed frames and determine
4803 * which need to be completed and which need to be
4806 * For completed frames, the completion functions need
4807 * to be called at the end of this function as the last
4808 * node reference may free the node.
4810 * Finally, since the TXQ lock can't be held during the
4811 * completion callback (to avoid lock recursion),
4812 * the completion calls have to be done outside of the
4817 ba_index = ATH_BA_INDEX(seq_st,
4818 SEQNO(bf->bf_state.bfs_seqno));
4819 bf_next = bf->bf_next;
4820 bf->bf_next = NULL; /* Remove it from the aggr list */
4822 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4823 "%s: checking bf=%p seqno=%d; ack=%d\n",
4824 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
4825 ATH_BA_ISSET(ba, ba_index));
4827 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
4828 sc->sc_stats.ast_tx_aggr_ok++;
4829 ath_tx_update_baw(sc, an, atid, bf);
4830 bf->bf_state.bfs_dobaw = 0;
4831 if (!bf->bf_state.bfs_addedbaw)
4832 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4833 "%s: wasn't added: seqno %d\n",
4834 __func__, SEQNO(bf->bf_state.bfs_seqno));
4836 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4838 sc->sc_stats.ast_tx_aggr_fail++;
4839 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4842 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4850 * Now that the BAW updates have been done, unlock
4852 * txseq is grabbed before the lock is released so we
4853 * have a consistent view of what -was- in the BAW.
4854 * Anything after this point will not yet have been
4857 txseq = tap->txa_start;
4861 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4862 "%s: num frames seen=%d; bf nframes=%d\n",
4863 __func__, nframes, nf);
4866 * Now we know how many frames were bad, call the rate
4870 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
4874 * send bar if we dropped any frames
4877 /* Suspend the TX queue and get ready to send the BAR */
4879 ath_tx_tid_bar_suspend(sc, atid);
4883 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4884 "%s: txa_start now %d\n", __func__, tap->txa_start);
4888 /* Prepend all frames to the beginning of the queue */
4889 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4890 TAILQ_REMOVE(&bf_q, bf, bf_list);
4891 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4895 * Reschedule to grab some further frames.
4897 ath_tx_tid_sched(sc, atid);
4900 * If the queue is filtered, re-schedule as required.
4902 * This is required as there may be a subsequent TX descriptor
4903 * for this end-node that has CLRDMASK set, so it's quite possible
4904 * that a filtered frame will be followed by a non-filtered
4905 * (complete or otherwise) frame.
4907 * XXX should we do this before we complete the frame?
4909 if (atid->isfiltered)
4910 ath_tx_tid_filt_comp_complete(sc, atid);
4915 * Send BAR if required
4917 if (ath_tx_tid_bar_tx_ready(sc, atid))
4918 ath_tx_tid_bar_tx(sc, atid);
4922 /* Do deferred completion */
4923 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4924 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4925 ath_tx_default_comp(sc, bf, 0);
4930 * Handle completion of unaggregated frames in an ADDBA
4933 * Fail is set to 1 if the entry is being freed via a call to
4934 * ath_tx_draintxq().
4937 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
4939 struct ieee80211_node *ni = bf->bf_node;
4940 struct ath_node *an = ATH_NODE(ni);
4941 int tid = bf->bf_state.bfs_tid;
4942 struct ath_tid *atid = &an->an_tid[tid];
4943 struct ath_tx_status ts;
4947 * Take a copy of this; filtering/cloning the frame may free the
4950 ts = bf->bf_status.ds_txstat;
4953 * Update rate control status here, before we possibly
4954 * punt to retry or cleanup.
4956 * Do it outside of the TXQ lock.
4958 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4959 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4960 &bf->bf_status.ds_txstat,
4961 bf->bf_state.bfs_pktlen,
4962 1, (ts.ts_status == 0) ? 0 : 1);
4965 * This is called early so atid->hwq_depth can be tracked.
4966 * This unfortunately means that it's released and regrabbed
4967 * during retry and cleanup. That's rather inefficient.
4971 if (tid == IEEE80211_NONQOS_TID)
4972 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
4974 DPRINTF(sc, ATH_DEBUG_SW_TX,
4975 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
4976 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
4977 SEQNO(bf->bf_state.bfs_seqno));
4980 if (atid->hwq_depth < 0)
4981 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4982 __func__, atid->hwq_depth);
4985 * If the TID is filtered, handle completing the filter
4986 * transition before potentially kicking it to the cleanup
4989 if (atid->isfiltered)
4990 ath_tx_tid_filt_comp_complete(sc, atid);
4993 * If a cleanup is in progress, punt to comp_cleanup;
4994 * rather than handling it here. It's thus their
4995 * responsibility to clean up, call the completion
4996 * function in net80211, etc.
4998 if (atid->cleanup_inprogress) {
4999 if (atid->isfiltered)
5000 DPRINTF(sc, ATH_DEBUG_SW_TX,
5001 "%s: isfiltered=1, normal_comp?\n",
5004 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
5006 ath_tx_comp_cleanup_unaggr(sc, bf);
5011 * XXX TODO: how does cleanup, BAR and filtered frame handling
5014 * If the frame is filtered OR if it's any failure but
5015 * the TID is filtered, the frame must be added to the
5016 * filtered frame list.
5018 * However - a busy buffer can't be added to the filtered
5019 * list as it will end up being recycled without having
5020 * been made available for the hardware.
5022 if ((ts.ts_status & HAL_TXERR_FILT) ||
5023 (ts.ts_status != 0 && atid->isfiltered)) {
5027 DPRINTF(sc, ATH_DEBUG_SW_TX,
5028 "%s: isfiltered=1, fail=%d\n",
5030 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5032 /* Remove from BAW */
5033 if (bf->bf_state.bfs_addedbaw)
5035 if (bf->bf_state.bfs_dobaw) {
5036 ath_tx_update_baw(sc, an, atid, bf);
5037 if (!bf->bf_state.bfs_addedbaw)
5038 DPRINTF(sc, ATH_DEBUG_SW_TX,
5039 "%s: wasn't added: seqno %d\n",
5040 __func__, SEQNO(bf->bf_state.bfs_seqno));
5042 bf->bf_state.bfs_dobaw = 0;
5046 * If the frame couldn't be filtered, treat it as a drop and
5047 * prepare to send a BAR.
5049 if (freeframe && drops)
5050 ath_tx_tid_bar_suspend(sc, atid);
5053 * Send BAR if required
5055 if (ath_tx_tid_bar_tx_ready(sc, atid))
5056 ath_tx_tid_bar_tx(sc, atid);
5060 * If freeframe is set, then the frame couldn't be
5061 * cloned and bf is still valid. Just complete/free it.
5064 ath_tx_default_comp(sc, bf, fail);
5070 * Don't bother with the retry check if all frames
5071 * are being failed (eg during queue deletion.)
5074 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5076 if (fail == 0 && ts.ts_status != 0) {
5078 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5080 ath_tx_aggr_retry_unaggr(sc, bf);
5084 /* Success? Complete */
5085 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5086 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5087 if (bf->bf_state.bfs_dobaw) {
5088 ath_tx_update_baw(sc, an, atid, bf);
5089 bf->bf_state.bfs_dobaw = 0;
5090 if (!bf->bf_state.bfs_addedbaw)
5091 DPRINTF(sc, ATH_DEBUG_SW_TX,
5092 "%s: wasn't added: seqno %d\n",
5093 __func__, SEQNO(bf->bf_state.bfs_seqno));
5097 * If the queue is filtered, re-schedule as required.
5099 * This is required as there may be a subsequent TX descriptor
5100 * for this end-node that has CLRDMASK set, so it's quite possible
5101 * that a filtered frame will be followed by a non-filtered
5102 * (complete or otherwise) frame.
5104 * XXX should we do this before we complete the frame?
5106 if (atid->isfiltered)
5107 ath_tx_tid_filt_comp_complete(sc, atid);
5110 * Send BAR if required
5112 if (ath_tx_tid_bar_tx_ready(sc, atid))
5113 ath_tx_tid_bar_tx(sc, atid);
5117 ath_tx_default_comp(sc, bf, fail);
5118 /* bf is freed at this point */
5122 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5124 if (bf->bf_state.bfs_aggr)
5125 ath_tx_aggr_comp_aggr(sc, bf, fail);
5127 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5131 * Schedule some packets from the given node/TID to the hardware.
5133 * This is the aggregate version.
5136 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5137 struct ath_tid *tid)
5140 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5141 struct ieee80211_tx_ampdu *tap;
5142 ATH_AGGR_STATUS status;
5145 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5146 ATH_TX_LOCK_ASSERT(sc);
5149 * XXX TODO: If we're called for a queue that we're leaking frames to,
5150 * ensure we only leak one.
5153 tap = ath_tx_get_tx_tid(an, tid->tid);
5155 if (tid->tid == IEEE80211_NONQOS_TID)
5156 DPRINTF(sc, ATH_DEBUG_SW_TX,
5157 "%s: called for TID=NONQOS_TID?\n", __func__);
5160 status = ATH_AGGR_DONE;
5163 * If the upper layer has paused the TID, don't
5164 * queue any further packets.
5166 * This can also occur from the completion task because
5167 * of packet loss; but as its serialised with this code,
5168 * it won't "appear" half way through queuing packets.
5170 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5173 bf = ATH_TID_FIRST(tid);
5179 * If the packet doesn't fall within the BAW (eg a NULL
5180 * data frame), schedule it directly; continue.
5182 if (! bf->bf_state.bfs_dobaw) {
5183 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5184 "%s: non-baw packet\n",
5186 ATH_TID_REMOVE(tid, bf, bf_list);
5188 if (bf->bf_state.bfs_nframes > 1)
5189 DPRINTF(sc, ATH_DEBUG_SW_TX,
5190 "%s: aggr=%d, nframes=%d\n",
5192 bf->bf_state.bfs_aggr,
5193 bf->bf_state.bfs_nframes);
5196 * This shouldn't happen - such frames shouldn't
5197 * ever have been queued as an aggregate in the
5198 * first place. However, make sure the fields
5199 * are correctly setup just to be totally sure.
5201 bf->bf_state.bfs_aggr = 0;
5202 bf->bf_state.bfs_nframes = 1;
5204 /* Update CLRDMASK just before this frame is queued */
5205 ath_tx_update_clrdmask(sc, tid, bf);
5207 ath_tx_do_ratelookup(sc, bf);
5208 ath_tx_calc_duration(sc, bf);
5209 ath_tx_calc_protection(sc, bf);
5210 ath_tx_set_rtscts(sc, bf);
5211 ath_tx_rate_fill_rcflags(sc, bf);
5212 ath_tx_setds(sc, bf);
5213 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5215 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5217 /* Queue the packet; continue */
5224 * Do a rate control lookup on the first frame in the
5225 * list. The rate control code needs that to occur
5226 * before it can determine whether to TX.
5227 * It's inaccurate because the rate control code doesn't
5228 * really "do" aggregate lookups, so it only considers
5229 * the size of the first frame.
5231 ath_tx_do_ratelookup(sc, bf);
5232 bf->bf_state.bfs_rc[3].rix = 0;
5233 bf->bf_state.bfs_rc[3].tries = 0;
5235 ath_tx_calc_duration(sc, bf);
5236 ath_tx_calc_protection(sc, bf);
5238 ath_tx_set_rtscts(sc, bf);
5239 ath_tx_rate_fill_rcflags(sc, bf);
5241 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5243 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5244 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5247 * No frames to be picked up - out of BAW
5249 if (TAILQ_EMPTY(&bf_q))
5253 * This assumes that the descriptor list in the ath_bufhead
5254 * are already linked together via bf_next pointers.
5256 bf = TAILQ_FIRST(&bf_q);
5258 if (status == ATH_AGGR_8K_LIMITED)
5259 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5262 * If it's the only frame send as non-aggregate
5263 * assume that ath_tx_form_aggr() has checked
5264 * whether it's in the BAW and added it appropriately.
5266 if (bf->bf_state.bfs_nframes == 1) {
5267 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5268 "%s: single-frame aggregate\n", __func__);
5270 /* Update CLRDMASK just before this frame is queued */
5271 ath_tx_update_clrdmask(sc, tid, bf);
5273 bf->bf_state.bfs_aggr = 0;
5274 bf->bf_state.bfs_ndelim = 0;
5275 ath_tx_setds(sc, bf);
5276 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5277 if (status == ATH_AGGR_BAW_CLOSED)
5278 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5280 sc->sc_aggr_stats.aggr_single_pkt++;
5282 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5283 "%s: multi-frame aggregate: %d frames, "
5285 __func__, bf->bf_state.bfs_nframes,
5286 bf->bf_state.bfs_al);
5287 bf->bf_state.bfs_aggr = 1;
5288 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5289 sc->sc_aggr_stats.aggr_aggr_pkt++;
5291 /* Update CLRDMASK just before this frame is queued */
5292 ath_tx_update_clrdmask(sc, tid, bf);
5295 * Calculate the duration/protection as required.
5297 ath_tx_calc_duration(sc, bf);
5298 ath_tx_calc_protection(sc, bf);
5301 * Update the rate and rtscts information based on the
5302 * rate decision made by the rate control code;
5303 * the first frame in the aggregate needs it.
5305 ath_tx_set_rtscts(sc, bf);
5308 * Setup the relevant descriptor fields
5309 * for aggregation. The first descriptor
5310 * already points to the rest in the chain.
5312 ath_tx_setds_11n(sc, bf);
5316 /* Set completion handler, multi-frame aggregate or not */
5317 bf->bf_comp = ath_tx_aggr_comp;
5319 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5320 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5323 * Update leak count and frame config if were leaking frames.
5325 * XXX TODO: it should update all frames in an aggregate
5328 ath_tx_leak_count_update(sc, tid, bf);
5331 ath_tx_handoff(sc, txq, bf);
5333 /* Track outstanding buffer count to hardware */
5334 /* aggregates are "one" buffer */
5338 * Break out if ath_tx_form_aggr() indicated
5339 * there can't be any further progress (eg BAW is full.)
5340 * Checking for an empty txq is done above.
5342 * XXX locking on txq here?
5344 /* XXX TXQ locking */
5345 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5346 (status == ATH_AGGR_BAW_CLOSED ||
5347 status == ATH_AGGR_LEAK_CLOSED))
5353 * Schedule some packets from the given node/TID to the hardware.
5355 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5356 * It just dumps frames into the TXQ. We should limit how deep
5357 * the transmit queue can grow for frames dispatched to the given
5360 * To avoid locking issues, either we need to own the TXQ lock
5361 * at this point, or we need to pass in the maximum frame count
5365 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5366 struct ath_tid *tid)
5369 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5371 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5372 __func__, an, tid->tid);
5374 ATH_TX_LOCK_ASSERT(sc);
5376 /* Check - is AMPDU pending or running? then print out something */
5377 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5378 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5379 __func__, tid->tid);
5380 if (ath_tx_ampdu_running(sc, an, tid->tid))
5381 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5382 __func__, tid->tid);
5387 * If the upper layers have paused the TID, don't
5388 * queue any further packets.
5390 * XXX if we are leaking frames, make sure we decrement
5391 * that counter _and_ we continue here.
5393 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5396 bf = ATH_TID_FIRST(tid);
5401 ATH_TID_REMOVE(tid, bf, bf_list);
5404 if (tid->tid != bf->bf_state.bfs_tid) {
5405 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5406 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5409 /* Normal completion handler */
5410 bf->bf_comp = ath_tx_normal_comp;
5413 * Override this for now, until the non-aggregate
5414 * completion handler correctly handles software retransmits.
5416 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5418 /* Update CLRDMASK just before this frame is queued */
5419 ath_tx_update_clrdmask(sc, tid, bf);
5421 /* Program descriptors + rate control */
5422 ath_tx_do_ratelookup(sc, bf);
5423 ath_tx_calc_duration(sc, bf);
5424 ath_tx_calc_protection(sc, bf);
5425 ath_tx_set_rtscts(sc, bf);
5426 ath_tx_rate_fill_rcflags(sc, bf);
5427 ath_tx_setds(sc, bf);
5430 * Update the current leak count if
5431 * we're leaking frames; and set the
5432 * MORE flag as appropriate.
5434 ath_tx_leak_count_update(sc, tid, bf);
5436 /* Track outstanding buffer count to hardware */
5437 /* aggregates are "one" buffer */
5440 /* Punt to hardware or software txq */
5441 ath_tx_handoff(sc, txq, bf);
5446 * Schedule some packets to the given hardware queue.
5448 * This function walks the list of TIDs (ie, ath_node TIDs
5449 * with queued traffic) and attempts to schedule traffic
5452 * TID scheduling is implemented as a FIFO, with TIDs being
5453 * added to the end of the queue after some frames have been
5457 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5459 struct ath_tid *tid, *next, *last;
5461 ATH_TX_LOCK_ASSERT(sc);
5464 * Don't schedule if the hardware queue is busy.
5465 * This (hopefully) gives some more time to aggregate
5466 * some packets in the aggregation queue.
5468 * XXX It doesn't stop a parallel sender from sneaking
5469 * in transmitting a frame!
5471 /* XXX TXQ locking */
5472 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5473 sc->sc_aggr_stats.aggr_sched_nopkt++;
5476 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5477 sc->sc_aggr_stats.aggr_sched_nopkt++;
5481 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5483 TAILQ_FOREACH_SAFE(tid, &txq->axq_tidq, axq_qelem, next) {
5485 * Suspend paused queues here; they'll be resumed
5486 * once the addba completes or times out.
5488 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5489 __func__, tid->tid, tid->paused);
5490 ath_tx_tid_unsched(sc, tid);
5492 * This node may be in power-save and we're leaking
5493 * a frame; be careful.
5495 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5498 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5499 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5501 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5503 /* Not empty? Re-schedule */
5504 if (tid->axq_depth != 0)
5505 ath_tx_tid_sched(sc, tid);
5508 * Give the software queue time to aggregate more
5509 * packets. If we aren't running aggregation then
5510 * we should still limit the hardware queue depth.
5512 /* XXX TXQ locking */
5513 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5516 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5521 * If this was the last entry on the original list, stop.
5522 * Otherwise nodes that have been rescheduled onto the end
5523 * of the TID FIFO list will just keep being rescheduled.
5525 * XXX What should we do about nodes that were paused
5526 * but are pending a leaking frame in response to a ps-poll?
5527 * They'll be put at the front of the list; so they'll
5528 * prematurely trigger this condition! Ew.
5540 * Return net80211 TID struct pointer, or NULL for none
5542 struct ieee80211_tx_ampdu *
5543 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5545 struct ieee80211_node *ni = &an->an_node;
5546 struct ieee80211_tx_ampdu *tap;
5548 if (tid == IEEE80211_NONQOS_TID)
5551 tap = &ni->ni_tx_ampdu[tid];
5556 * Is AMPDU-TX running?
5559 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5561 struct ieee80211_tx_ampdu *tap;
5563 if (tid == IEEE80211_NONQOS_TID)
5566 tap = ath_tx_get_tx_tid(an, tid);
5568 return 0; /* Not valid; default to not running */
5570 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5574 * Is AMPDU-TX negotiation pending?
5577 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5579 struct ieee80211_tx_ampdu *tap;
5581 if (tid == IEEE80211_NONQOS_TID)
5584 tap = ath_tx_get_tx_tid(an, tid);
5586 return 0; /* Not valid; default to not pending */
5588 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5592 * Is AMPDU-TX pending for the given TID?
5597 * Method to handle sending an ADDBA request.
5599 * We tap this so the relevant flags can be set to pause the TID
5600 * whilst waiting for the response.
5602 * XXX there's no timeout handler we can override?
5605 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5606 int dialogtoken, int baparamset, int batimeout)
5608 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5609 int tid = tap->txa_tid;
5610 struct ath_node *an = ATH_NODE(ni);
5611 struct ath_tid *atid = &an->an_tid[tid];
5614 * XXX danger Will Robinson!
5616 * Although the taskqueue may be running and scheduling some more
5617 * packets, these should all be _before_ the addba sequence number.
5618 * However, net80211 will keep self-assigning sequence numbers
5619 * until addba has been negotiated.
5621 * In the past, these packets would be "paused" (which still works
5622 * fine, as they're being scheduled to the driver in the same
5623 * serialised method which is calling the addba request routine)
5624 * and when the aggregation session begins, they'll be dequeued
5625 * as aggregate packets and added to the BAW. However, now there's
5626 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5627 * packets. Thus they never get included in the BAW tracking and
5628 * this can cause the initial burst of packets after the addba
5629 * negotiation to "hang", as they quickly fall outside the BAW.
5631 * The "eventual" solution should be to tag these packets with
5632 * dobaw. Although net80211 has given us a sequence number,
5633 * it'll be "after" the left edge of the BAW and thus it'll
5638 * This is a bit annoying. Until net80211 HT code inherits some
5639 * (any) locking, we may have this called in parallel BUT only
5640 * one response/timeout will be called. Grr.
5642 if (atid->addba_tx_pending == 0) {
5643 ath_tx_tid_pause(sc, atid);
5644 atid->addba_tx_pending = 1;
5648 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5649 "%s: %6D: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5653 dialogtoken, baparamset, batimeout);
5654 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5655 "%s: txa_start=%d, ni_txseqs=%d\n",
5656 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5658 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5663 * Handle an ADDBA response.
5665 * We unpause the queue so TX'ing can resume.
5667 * Any packets TX'ed from this point should be "aggregate" (whether
5668 * aggregate or not) so the BAW is updated.
5670 * Note! net80211 keeps self-assigning sequence numbers until
5671 * ampdu is negotiated. This means the initially-negotiated BAW left
5672 * edge won't match the ni->ni_txseq.
5674 * So, being very dirty, the BAW left edge is "slid" here to match
5677 * What likely SHOULD happen is that all packets subsequent to the
5678 * addba request should be tagged as aggregate and queued as non-aggregate
5679 * frames; thus updating the BAW. For now though, I'll just slide the
5683 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5684 int status, int code, int batimeout)
5686 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5687 int tid = tap->txa_tid;
5688 struct ath_node *an = ATH_NODE(ni);
5689 struct ath_tid *atid = &an->an_tid[tid];
5692 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5693 "%s: %6D: called; status=%d, code=%d, batimeout=%d\n", __func__,
5696 status, code, batimeout);
5698 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5699 "%s: txa_start=%d, ni_txseqs=%d\n",
5700 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5703 * Call this first, so the interface flags get updated
5704 * before the TID is unpaused. Otherwise a race condition
5705 * exists where the unpaused TID still doesn't yet have
5706 * IEEE80211_AGGR_RUNNING set.
5708 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5711 atid->addba_tx_pending = 0;
5714 * Slide the BAW left edge to wherever net80211 left it for us.
5715 * Read above for more information.
5717 tap->txa_start = ni->ni_txseqs[tid];
5718 ath_tx_tid_resume(sc, atid);
5725 * Stop ADDBA on a queue.
5727 * This can be called whilst BAR TX is currently active on the queue,
5728 * so make sure this is unblocked before continuing.
5731 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5733 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5734 int tid = tap->txa_tid;
5735 struct ath_node *an = ATH_NODE(ni);
5736 struct ath_tid *atid = &an->an_tid[tid];
5740 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %6D: called\n",
5746 * Pause TID traffic early, so there aren't any races
5747 * Unblock the pending BAR held traffic, if it's currently paused.
5750 ath_tx_tid_pause(sc, atid);
5751 if (atid->bar_wait) {
5753 * bar_unsuspend() expects bar_tx == 1, as it should be
5754 * called from the TX completion path. This quietens
5755 * the warning. It's cleared for us anyway.
5758 ath_tx_tid_bar_unsuspend(sc, atid);
5762 /* There's no need to hold the TXQ lock here */
5763 sc->sc_addba_stop(ni, tap);
5766 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
5767 * it'll set the cleanup flag, and it'll be unpaused once
5768 * things have been cleaned up.
5772 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
5774 * Unpause the TID if no cleanup is required.
5776 if (! atid->cleanup_inprogress)
5777 ath_tx_tid_resume(sc, atid);
5780 /* Handle completing frames and fail them */
5781 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5782 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5783 ath_tx_default_comp(sc, bf, 1);
5789 * Handle a node reassociation.
5791 * We may have a bunch of frames queued to the hardware; those need
5792 * to be marked as cleanup.
5795 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
5797 struct ath_tid *tid;
5804 ATH_TX_UNLOCK_ASSERT(sc);
5807 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
5808 tid = &an->an_tid[i];
5809 if (tid->hwq_depth == 0)
5811 ath_tx_tid_pause(sc, tid);
5812 DPRINTF(sc, ATH_DEBUG_NODE,
5813 "%s: %6D: TID %d: cleaning up TID\n",
5815 an->an_node.ni_macaddr,
5818 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
5820 * Unpause the TID if no cleanup is required.
5822 if (! tid->cleanup_inprogress)
5823 ath_tx_tid_resume(sc, tid);
5827 /* Handle completing frames and fail them */
5828 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5829 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5830 ath_tx_default_comp(sc, bf, 1);
5835 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
5836 * it simply tears down the aggregation session. Ew.
5838 * It however will call ieee80211_ampdu_stop() which will call
5839 * ic->ic_addba_stop().
5841 * XXX This uses a hard-coded max BAR count value; the whole
5842 * XXX BAR TX success or failure should be better handled!
5845 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5848 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5849 int tid = tap->txa_tid;
5850 struct ath_node *an = ATH_NODE(ni);
5851 struct ath_tid *atid = &an->an_tid[tid];
5852 int attempts = tap->txa_attempts;
5854 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5855 "%s: %6D: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d\n",
5864 /* Note: This may update the BAW details */
5865 sc->sc_bar_response(ni, tap, status);
5867 /* Unpause the TID */
5869 * XXX if this is attempt=50, the TID will be downgraded
5870 * XXX to a non-aggregate session. So we must unpause the
5871 * XXX TID here or it'll never be done.
5873 * Also, don't call it if bar_tx/bar_wait are 0; something
5874 * has beaten us to the punch? (XXX figure out what?)
5876 if (status == 0 || attempts == 50) {
5878 if (atid->bar_tx == 0 || atid->bar_wait == 0)
5879 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5880 "%s: huh? bar_tx=%d, bar_wait=%d\n",
5882 atid->bar_tx, atid->bar_wait);
5884 ath_tx_tid_bar_unsuspend(sc, atid);
5890 * This is called whenever the pending ADDBA request times out.
5891 * Unpause and reschedule the TID.
5894 ath_addba_response_timeout(struct ieee80211_node *ni,
5895 struct ieee80211_tx_ampdu *tap)
5897 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5898 int tid = tap->txa_tid;
5899 struct ath_node *an = ATH_NODE(ni);
5900 struct ath_tid *atid = &an->an_tid[tid];
5902 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5903 "%s: %6D: TID=%d, called; resuming\n",
5910 atid->addba_tx_pending = 0;
5913 /* Note: This updates the aggregate state to (again) pending */
5914 sc->sc_addba_response_timeout(ni, tap);
5916 /* Unpause the TID; which reschedules it */
5918 ath_tx_tid_resume(sc, atid);
5923 * Check if a node is asleep or not.
5926 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
5929 ATH_TX_LOCK_ASSERT(sc);
5931 return (an->an_is_powersave);
5935 * Mark a node as currently "in powersaving."
5936 * This suspends all traffic on the node.
5938 * This must be called with the node/tx locks free.
5940 * XXX TODO: the locking silliness below is due to how the node
5941 * locking currently works. Right now, the node lock is grabbed
5942 * to do rate control lookups and these are done with the TX
5943 * queue lock held. This means the node lock can't be grabbed
5944 * first here or a LOR will occur.
5946 * Eventually (hopefully!) the TX path code will only grab
5947 * the TXQ lock when transmitting and the ath_node lock when
5948 * doing node/TID operations. There are other complications -
5949 * the sched/unsched operations involve walking the per-txq
5950 * 'active tid' list and this requires both locks to be held.
5953 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
5955 struct ath_tid *atid;
5956 struct ath_txq *txq;
5959 ATH_TX_UNLOCK_ASSERT(sc);
5961 /* Suspend all traffic on the node */
5964 if (an->an_is_powersave) {
5965 DPRINTF(sc, ATH_DEBUG_XMIT,
5966 "%s: %6D: node was already asleep!\n",
5967 __func__, an->an_node.ni_macaddr, ":");
5972 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
5973 atid = &an->an_tid[tid];
5974 txq = sc->sc_ac2q[atid->ac];
5976 ath_tx_tid_pause(sc, atid);
5979 /* Mark node as in powersaving */
5980 an->an_is_powersave = 1;
5986 * Mark a node as currently "awake."
5987 * This resumes all traffic to the node.
5990 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
5992 struct ath_tid *atid;
5993 struct ath_txq *txq;
5996 ATH_TX_UNLOCK_ASSERT(sc);
6001 if (an->an_is_powersave == 0) {
6003 DPRINTF(sc, ATH_DEBUG_XMIT,
6004 "%s: an=%p: node was already awake\n",
6009 /* Mark node as awake */
6010 an->an_is_powersave = 0;
6012 * Clear any pending leaked frame requests
6014 an->an_leak_count = 0;
6016 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6017 atid = &an->an_tid[tid];
6018 txq = sc->sc_ac2q[atid->ac];
6020 ath_tx_tid_resume(sc, atid);
6026 ath_legacy_dma_txsetup(struct ath_softc *sc)
6029 /* nothing new needed */
6034 ath_legacy_dma_txteardown(struct ath_softc *sc)
6037 /* nothing new needed */
6042 ath_xmit_setup_legacy(struct ath_softc *sc)
6045 * For now, just set the descriptor length to sizeof(ath_desc);
6046 * worry about extracting the real length out of the HAL later.
6048 sc->sc_tx_desclen = sizeof(struct ath_desc);
6049 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6050 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6052 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6053 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6054 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6056 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6057 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6059 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;