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>
107 extern const char* ath_hal_ether_sprintf(const uint8_t *mac);
110 * How many retries to perform in software
112 #define SWMAX_RETRIES 10
115 * What queue to throw the non-QoS TID traffic into
117 #define ATH_NONQOS_TID_AC WME_AC_VO
120 static int ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an);
122 static int ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an,
124 static int ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an,
126 static ieee80211_seq ath_tx_tid_seqno_assign(struct ath_softc *sc,
127 struct ieee80211_node *ni, struct ath_buf *bf, struct mbuf *m0);
128 static int ath_tx_action_frame_override_queue(struct ath_softc *sc,
129 struct ieee80211_node *ni, struct mbuf *m0, int *tid);
130 static struct ath_buf *
131 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
132 struct ath_tid *tid, struct ath_buf *bf);
136 ath_tx_alq_post(struct ath_softc *sc, struct ath_buf *bf_first)
142 /* XXX we should skip out early if debugging isn't enabled! */
146 /* XXX should ensure bf_nseg > 0! */
147 if (bf->bf_nseg == 0)
149 n = ((bf->bf_nseg - 1) / sc->sc_tx_nmaps) + 1;
150 for (i = 0, ds = (const char *) bf->bf_desc;
152 i++, ds += sc->sc_tx_desclen) {
153 if_ath_alq_post(&sc->sc_alq,
161 #endif /* ATH_DEBUG_ALQ */
164 * Whether to use the 11n rate scenario functions or not
167 ath_tx_is_11n(struct ath_softc *sc)
169 return ((sc->sc_ah->ah_magic == 0x20065416) ||
170 (sc->sc_ah->ah_magic == 0x19741014));
174 * Obtain the current TID from the given frame.
176 * Non-QoS frames need to go into TID 16 (IEEE80211_NONQOS_TID.)
177 * This has implications for which AC/priority the packet is placed
181 ath_tx_gettid(struct ath_softc *sc, const struct mbuf *m0)
183 const struct ieee80211_frame *wh;
184 int pri = M_WME_GETAC(m0);
186 wh = mtod(m0, const struct ieee80211_frame *);
187 if (! IEEE80211_QOS_HAS_SEQ(wh))
188 return IEEE80211_NONQOS_TID;
190 return WME_AC_TO_TID(pri);
194 ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
196 struct ieee80211_frame *wh;
198 wh = mtod(bf->bf_m, struct ieee80211_frame *);
199 /* Only update/resync if needed */
200 if (bf->bf_state.bfs_isretried == 0) {
201 wh->i_fc[1] |= IEEE80211_FC1_RETRY;
202 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
203 BUS_DMASYNC_PREWRITE);
205 bf->bf_state.bfs_isretried = 1;
206 bf->bf_state.bfs_retries ++;
210 * Determine what the correct AC queue for the given frame
213 * This code assumes that the TIDs map consistently to
214 * the underlying hardware (or software) ath_txq.
215 * Since the sender may try to set an AC which is
216 * arbitrary, non-QoS TIDs may end up being put on
217 * completely different ACs. There's no way to put a
218 * TID into multiple ath_txq's for scheduling, so
219 * for now we override the AC/TXQ selection and set
220 * non-QOS TID frames into the BE queue.
222 * This may be completely incorrect - specifically,
223 * some management frames may end up out of order
224 * compared to the QoS traffic they're controlling.
225 * I'll look into this later.
228 ath_tx_getac(struct ath_softc *sc, const struct mbuf *m0)
230 const struct ieee80211_frame *wh;
231 int pri = M_WME_GETAC(m0);
232 wh = mtod(m0, const struct ieee80211_frame *);
233 if (IEEE80211_QOS_HAS_SEQ(wh))
236 return ATH_NONQOS_TID_AC;
240 ath_txfrag_cleanup(struct ath_softc *sc,
241 ath_bufhead *frags, struct ieee80211_node *ni)
244 struct ath_buf *next;
246 ATH_TXBUF_LOCK_ASSERT(sc);
248 next = TAILQ_FIRST(frags);
249 while ((bf = next) != NULL) {
250 next = TAILQ_NEXT(bf, bf_list);
251 /* NB: bf assumed clean */
252 TAILQ_REMOVE(frags, bf, bf_list);
253 ath_returnbuf_head(sc, bf);
254 ieee80211_node_decref(ni);
259 * Setup xmit of a fragmented frame. Allocate a buffer
260 * for each frag and bump the node reference count to
261 * reflect the held reference to be setup by ath_tx_start.
264 ath_txfrag_setup(struct ath_softc *sc, ath_bufhead *frags,
265 struct mbuf *m0, struct ieee80211_node *ni)
271 for (m = m0->m_nextpkt; m != NULL; m = m->m_nextpkt) {
272 /* XXX non-management? */
273 bf = _ath_getbuf_locked(sc, ATH_BUFTYPE_NORMAL);
274 if (bf == NULL) { /* out of buffers, cleanup */
275 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: no buffer?\n",
277 ath_txfrag_cleanup(sc, frags, ni);
280 ieee80211_node_incref(ni);
281 TAILQ_INSERT_TAIL(frags, bf, bf_list);
283 ATH_TXBUF_UNLOCK(sc);
285 return !TAILQ_EMPTY(frags);
289 * Reclaim mbuf resources. For fragmented frames we
290 * need to claim each frag chained with m_nextpkt.
293 ath_freetx(struct mbuf *m)
301 } while ((m = next) != NULL);
305 ath_tx_dmasetup(struct ath_softc *sc, struct ath_buf *bf, struct mbuf *m0)
310 * Load the DMA map so any coalescing is done. This
311 * also calculates the number of descriptors we need.
313 error = bus_dmamap_load_mbuf_defrag(sc->sc_dmat, bf->bf_dmamap, &m0,
314 bf->bf_segs, ATH_TXDESC, &bf->bf_nseg,
317 sc->sc_stats.ast_tx_busdma++;
323 * Discard null packets.
325 if (bf->bf_nseg == 0) {
326 sc->sc_stats.ast_tx_nodata++;
330 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: m %p len %u\n",
331 __func__, m0, m0->m_pkthdr.len);
332 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
339 * Chain together segments+descriptors for a frame - 11n or otherwise.
341 * For aggregates, this is called on each frame in the aggregate.
344 ath_tx_chaindesclist(struct ath_softc *sc, struct ath_desc *ds0,
345 struct ath_buf *bf, int is_aggr, int is_first_subframe,
346 int is_last_subframe)
348 struct ath_hal *ah = sc->sc_ah;
351 HAL_DMA_ADDR bufAddrList[4];
352 uint32_t segLenList[4];
357 * XXX There's txdma and txdma_mgmt; the descriptor
360 struct ath_descdma *dd = &sc->sc_txdma;
363 * Fillin the remainder of the descriptor info.
367 * We need the number of TX data pointers in each descriptor.
368 * EDMA and later chips support 4 TX buffers per descriptor;
369 * previous chips just support one.
371 numTxMaps = sc->sc_tx_nmaps;
374 * For EDMA and later chips ensure the TX map is fully populated
375 * before advancing to the next descriptor.
377 ds = (char *) bf->bf_desc;
379 bzero(bufAddrList, sizeof(bufAddrList));
380 bzero(segLenList, sizeof(segLenList));
381 for (i = 0; i < bf->bf_nseg; i++) {
382 bufAddrList[bp] = bf->bf_segs[i].ds_addr;
383 segLenList[bp] = bf->bf_segs[i].ds_len;
387 * Go to the next segment if this isn't the last segment
388 * and there's space in the current TX map.
390 if ((i != bf->bf_nseg - 1) && (bp < numTxMaps))
394 * Last segment or we're out of buffer pointers.
398 if (i == bf->bf_nseg - 1)
399 ath_hal_settxdesclink(ah, (struct ath_desc *) ds, 0);
401 ath_hal_settxdesclink(ah, (struct ath_desc *) ds,
402 bf->bf_daddr + dd->dd_descsize * (dsp + 1));
405 * XXX This assumes that bfs_txq is the actual destination
406 * hardware queue at this point. It may not have been
407 * assigned, it may actually be pointing to the multicast
408 * software TXQ id. These must be fixed!
410 ath_hal_filltxdesc(ah, (struct ath_desc *) ds
413 , bf->bf_descid /* XXX desc id */
414 , bf->bf_state.bfs_tx_queue
415 , isFirstDesc /* first segment */
416 , i == bf->bf_nseg - 1 /* last segment */
417 , (struct ath_desc *) ds0 /* first descriptor */
421 * Make sure the 11n aggregate fields are cleared.
423 * XXX TODO: this doesn't need to be called for
424 * aggregate frames; as it'll be called on all
425 * sub-frames. Since the descriptors are in
426 * non-cacheable memory, this leads to some
427 * rather slow writes on MIPS/ARM platforms.
429 if (ath_tx_is_11n(sc))
430 ath_hal_clr11n_aggr(sc->sc_ah, (struct ath_desc *) ds);
433 * If 11n is enabled, set it up as if it's an aggregate
436 if (is_last_subframe) {
437 ath_hal_set11n_aggr_last(sc->sc_ah,
438 (struct ath_desc *) ds);
439 } else if (is_aggr) {
441 * This clears the aggrlen field; so
442 * the caller needs to call set_aggr_first()!
444 * XXX TODO: don't call this for the first
445 * descriptor in the first frame in an
448 ath_hal_set11n_aggr_middle(sc->sc_ah,
449 (struct ath_desc *) ds,
450 bf->bf_state.bfs_ndelim);
453 bf->bf_lastds = (struct ath_desc *) ds;
456 * Don't forget to skip to the next descriptor.
458 ds += sc->sc_tx_desclen;
462 * .. and don't forget to blank these out!
464 bzero(bufAddrList, sizeof(bufAddrList));
465 bzero(segLenList, sizeof(segLenList));
467 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMASYNC_PREWRITE);
471 * Set the rate control fields in the given descriptor based on
472 * the bf_state fields and node state.
474 * The bfs fields should already be set with the relevant rate
475 * control information, including whether MRR is to be enabled.
477 * Since the FreeBSD HAL currently sets up the first TX rate
478 * in ath_hal_setuptxdesc(), this will setup the MRR
479 * conditionally for the pre-11n chips, and call ath_buf_set_rate
480 * unconditionally for 11n chips. These require the 11n rate
481 * scenario to be set if MCS rates are enabled, so it's easier
482 * to just always call it. The caller can then only set rates 2, 3
483 * and 4 if multi-rate retry is needed.
486 ath_tx_set_ratectrl(struct ath_softc *sc, struct ieee80211_node *ni,
489 struct ath_rc_series *rc = bf->bf_state.bfs_rc;
491 /* If mrr is disabled, blank tries 1, 2, 3 */
492 if (! bf->bf_state.bfs_ismrr)
493 rc[1].tries = rc[2].tries = rc[3].tries = 0;
497 * If NOACK is set, just set ntries=1.
499 else if (bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) {
500 rc[1].tries = rc[2].tries = rc[3].tries = 0;
506 * Always call - that way a retried descriptor will
507 * have the MRR fields overwritten.
509 * XXX TODO: see if this is really needed - setting up
510 * the first descriptor should set the MRR fields to 0
513 if (ath_tx_is_11n(sc)) {
514 ath_buf_set_rate(sc, ni, bf);
516 ath_hal_setupxtxdesc(sc->sc_ah, bf->bf_desc
517 , rc[1].ratecode, rc[1].tries
518 , rc[2].ratecode, rc[2].tries
519 , rc[3].ratecode, rc[3].tries
525 * Setup segments+descriptors for an 11n aggregate.
526 * bf_first is the first buffer in the aggregate.
527 * The descriptor list must already been linked together using
531 ath_tx_setds_11n(struct ath_softc *sc, struct ath_buf *bf_first)
533 struct ath_buf *bf, *bf_prev = NULL;
534 struct ath_desc *ds0 = bf_first->bf_desc;
536 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: nframes=%d, al=%d\n",
537 __func__, bf_first->bf_state.bfs_nframes,
538 bf_first->bf_state.bfs_al);
542 if (bf->bf_state.bfs_txrate0 == 0)
543 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, txrate0=%d\n",
545 if (bf->bf_state.bfs_rc[0].ratecode == 0)
546 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: bf=%p, rix0=%d\n",
550 * Setup all descriptors of all subframes - this will
551 * call ath_hal_set11naggrmiddle() on every frame.
554 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
555 "%s: bf=%p, nseg=%d, pktlen=%d, seqno=%d\n",
556 __func__, bf, bf->bf_nseg, bf->bf_state.bfs_pktlen,
557 SEQNO(bf->bf_state.bfs_seqno));
560 * Setup the initial fields for the first descriptor - all
561 * the non-11n specific stuff.
563 ath_hal_setuptxdesc(sc->sc_ah, bf->bf_desc
564 , bf->bf_state.bfs_pktlen /* packet length */
565 , bf->bf_state.bfs_hdrlen /* header length */
566 , bf->bf_state.bfs_atype /* Atheros packet type */
567 , bf->bf_state.bfs_txpower /* txpower */
568 , bf->bf_state.bfs_txrate0
569 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
570 , bf->bf_state.bfs_keyix /* key cache index */
571 , bf->bf_state.bfs_txantenna /* antenna mode */
572 , bf->bf_state.bfs_txflags | HAL_TXDESC_INTREQ /* flags */
573 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
574 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
578 * First descriptor? Setup the rate control and initial
579 * aggregate header information.
581 if (bf == bf_first) {
583 * setup first desc with rate and aggr info
585 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
589 * Setup the descriptors for a multi-descriptor frame.
590 * This is both aggregate and non-aggregate aware.
592 ath_tx_chaindesclist(sc, ds0, bf,
594 !! (bf == bf_first), /* is_first_subframe */
595 !! (bf->bf_next == NULL) /* is_last_subframe */
598 if (bf == bf_first) {
600 * Initialise the first 11n aggregate with the
601 * aggregate length and aggregate enable bits.
603 ath_hal_set11n_aggr_first(sc->sc_ah,
606 bf->bf_state.bfs_ndelim);
610 * Link the last descriptor of the previous frame
611 * to the beginning descriptor of this frame.
614 ath_hal_settxdesclink(sc->sc_ah, bf_prev->bf_lastds,
617 /* Save a copy so we can link the next descriptor in */
623 * Set the first descriptor bf_lastds field to point to
624 * the last descriptor in the last subframe, that's where
625 * the status update will occur.
627 bf_first->bf_lastds = bf_prev->bf_lastds;
630 * And bf_last in the first descriptor points to the end of
631 * the aggregate list.
633 bf_first->bf_last = bf_prev;
636 * For non-AR9300 NICs, which require the rate control
637 * in the final descriptor - let's set that up now.
639 * This is because the filltxdesc() HAL call doesn't
640 * populate the last segment with rate control information
641 * if firstSeg is also true. For non-aggregate frames
642 * that is fine, as the first frame already has rate control
643 * info. But if the last frame in an aggregate has one
644 * descriptor, both firstseg and lastseg will be true and
645 * the rate info isn't copied.
647 * This is inefficient on MIPS/ARM platforms that have
648 * non-cachable memory for TX descriptors, but we'll just
651 * As to why the rate table is stashed in the last descriptor
652 * rather than the first descriptor? Because proctxdesc()
653 * is called on the final descriptor in an MPDU or A-MPDU -
654 * ie, the one that gets updated by the hardware upon
655 * completion. That way proctxdesc() doesn't need to know
656 * about the first _and_ last TX descriptor.
658 ath_hal_setuplasttxdesc(sc->sc_ah, bf_prev->bf_lastds, ds0);
660 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: end\n", __func__);
664 * Hand-off a frame to the multicast TX queue.
666 * This is a software TXQ which will be appended to the CAB queue
667 * during the beacon setup code.
669 * XXX TODO: since the AR9300 EDMA TX queue support wants the QCU ID
670 * as part of the TX descriptor, bf_state.bfs_tx_queue must be updated
671 * with the actual hardware txq, or all of this will fall apart.
673 * XXX It may not be a bad idea to just stuff the QCU ID into bf_state
674 * and retire bfs_tx_queue; then make sure the CABQ QCU ID is populated
678 ath_tx_handoff_mcast(struct ath_softc *sc, struct ath_txq *txq,
681 ATH_TX_LOCK_ASSERT(sc);
683 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
684 ("%s: busy status 0x%x", __func__, bf->bf_flags));
687 * Ensure that the tx queue is the cabq, so things get
690 if (bf->bf_state.bfs_tx_queue != sc->sc_cabq->axq_qnum) {
691 DPRINTF(sc, ATH_DEBUG_XMIT,
692 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
693 __func__, bf, bf->bf_state.bfs_tx_queue,
698 if (ATH_TXQ_LAST(txq, axq_q_s) != NULL) {
699 struct ath_buf *bf_last = ATH_TXQ_LAST(txq, axq_q_s);
700 struct ieee80211_frame *wh;
702 /* mark previous frame */
703 wh = mtod(bf_last->bf_m, struct ieee80211_frame *);
704 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
705 bus_dmamap_sync(sc->sc_dmat, bf_last->bf_dmamap,
706 BUS_DMASYNC_PREWRITE);
708 /* link descriptor */
709 ath_hal_settxdesclink(sc->sc_ah,
713 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
718 * Hand-off packet to a hardware queue.
721 ath_tx_handoff_hw(struct ath_softc *sc, struct ath_txq *txq,
724 struct ath_hal *ah = sc->sc_ah;
725 struct ath_buf *bf_first;
728 * Insert the frame on the outbound list and pass it on
729 * to the hardware. Multicast frames buffered for power
730 * save stations and transmit from the CAB queue are stored
731 * on a s/w only queue and loaded on to the CAB queue in
732 * the SWBA handler since frames only go out on DTIM and
733 * to avoid possible races.
735 ATH_TX_LOCK_ASSERT(sc);
736 KASSERT((bf->bf_flags & ATH_BUF_BUSY) == 0,
737 ("%s: busy status 0x%x", __func__, bf->bf_flags));
738 KASSERT(txq->axq_qnum != ATH_TXQ_SWQ,
739 ("ath_tx_handoff_hw called for mcast queue"));
742 * XXX We should instead just verify that sc_txstart_cnt
743 * or ath_txproc_cnt > 0. That would mean that
744 * the reset is going to be waiting for us to complete.
746 if (sc->sc_txproc_cnt == 0 && sc->sc_txstart_cnt == 0) {
747 device_printf(sc->sc_dev,
748 "%s: TX dispatch without holding txcount/txstart refcnt!\n",
753 * XXX .. this is going to cause the hardware to get upset;
754 * so we really should find some way to drop or queue
761 * XXX TODO: if there's a holdingbf, then
762 * ATH_TXQ_PUTRUNNING should be clear.
764 * If there is a holdingbf and the list is empty,
765 * then axq_link should be pointing to the holdingbf.
767 * Otherwise it should point to the last descriptor
768 * in the last ath_buf.
770 * In any case, we should really ensure that we
771 * update the previous descriptor link pointer to
772 * this descriptor, regardless of all of the above state.
774 * For now this is captured by having axq_link point
775 * to either the holdingbf (if the TXQ list is empty)
776 * or the end of the list (if the TXQ list isn't empty.)
777 * I'd rather just kill axq_link here and do it as above.
781 * Append the frame to the TX queue.
783 ATH_TXQ_INSERT_TAIL(txq, bf, bf_list);
784 ATH_KTR(sc, ATH_KTR_TX, 3,
785 "ath_tx_handoff: non-tdma: txq=%u, add bf=%p "
792 * If there's a link pointer, update it.
794 * XXX we should replace this with the above logic, just
795 * to kill axq_link with fire.
797 if (txq->axq_link != NULL) {
798 *txq->axq_link = bf->bf_daddr;
799 DPRINTF(sc, ATH_DEBUG_XMIT,
800 "%s: link[%u](%p)=%p (%p) depth %d\n", __func__,
801 txq->axq_qnum, txq->axq_link,
802 (caddr_t)bf->bf_daddr, bf->bf_desc,
804 ATH_KTR(sc, ATH_KTR_TX, 5,
805 "ath_tx_handoff: non-tdma: link[%u](%p)=%p (%p) "
807 txq->axq_qnum, txq->axq_link,
808 (caddr_t)bf->bf_daddr, bf->bf_desc,
813 * If we've not pushed anything into the hardware yet,
814 * push the head of the queue into the TxDP.
816 * Once we've started DMA, there's no guarantee that
817 * updating the TxDP with a new value will actually work.
818 * So we just don't do that - if we hit the end of the list,
819 * we keep that buffer around (the "holding buffer") and
820 * re-start DMA by updating the link pointer of _that_
821 * descriptor and then restart DMA.
823 if (! (txq->axq_flags & ATH_TXQ_PUTRUNNING)) {
824 bf_first = TAILQ_FIRST(&txq->axq_q);
825 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
826 ath_hal_puttxbuf(ah, txq->axq_qnum, bf_first->bf_daddr);
827 DPRINTF(sc, ATH_DEBUG_XMIT,
828 "%s: TXDP[%u] = %p (%p) depth %d\n",
829 __func__, txq->axq_qnum,
830 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
832 ATH_KTR(sc, ATH_KTR_TX, 5,
833 "ath_tx_handoff: TXDP[%u] = %p (%p) "
834 "lastds=%p depth %d",
836 (caddr_t)bf_first->bf_daddr, bf_first->bf_desc,
842 * Ensure that the bf TXQ matches this TXQ, so later
843 * checking and holding buffer manipulation is sane.
845 if (bf->bf_state.bfs_tx_queue != txq->axq_qnum) {
846 DPRINTF(sc, ATH_DEBUG_XMIT,
847 "%s: bf=%p, bfs_tx_queue=%d, axq_qnum=%d\n",
848 __func__, bf, bf->bf_state.bfs_tx_queue,
853 * Track aggregate queue depth.
855 if (bf->bf_state.bfs_aggr)
856 txq->axq_aggr_depth++;
859 * Update the link pointer.
861 ath_hal_gettxdesclinkptr(ah, bf->bf_lastds, &txq->axq_link);
866 * If we wrote a TxDP above, DMA will start from here.
868 * If DMA is running, it'll do nothing.
870 * If the DMA engine hit the end of the QCU list (ie LINK=NULL,
871 * or VEOL) then it stops at the last transmitted write.
872 * We then append a new frame by updating the link pointer
873 * in that descriptor and then kick TxE here; it will re-read
874 * that last descriptor and find the new descriptor to transmit.
876 * This is why we keep the holding descriptor around.
878 ath_hal_txstart(ah, txq->axq_qnum);
880 ATH_KTR(sc, ATH_KTR_TX, 1,
881 "ath_tx_handoff: txq=%u, txstart", txq->axq_qnum);
885 * Restart TX DMA for the given TXQ.
887 * This must be called whether the queue is empty or not.
890 ath_legacy_tx_dma_restart(struct ath_softc *sc, struct ath_txq *txq)
892 struct ath_buf *bf, *bf_last;
894 ATH_TXQ_LOCK_ASSERT(txq);
896 /* XXX make this ATH_TXQ_FIRST */
897 bf = TAILQ_FIRST(&txq->axq_q);
898 bf_last = ATH_TXQ_LAST(txq, axq_q_s);
903 DPRINTF(sc, ATH_DEBUG_RESET,
904 "%s: Q%d: bf=%p, bf_last=%p, daddr=0x%08x\n",
909 (uint32_t) bf->bf_daddr);
912 if (sc->sc_debug & ATH_DEBUG_RESET)
913 ath_tx_dump(sc, txq);
917 * This is called from a restart, so DMA is known to be
918 * completely stopped.
920 KASSERT((!(txq->axq_flags & ATH_TXQ_PUTRUNNING)),
921 ("%s: Q%d: called with PUTRUNNING=1\n",
925 ath_hal_puttxbuf(sc->sc_ah, txq->axq_qnum, bf->bf_daddr);
926 txq->axq_flags |= ATH_TXQ_PUTRUNNING;
928 ath_hal_gettxdesclinkptr(sc->sc_ah, bf_last->bf_lastds,
930 ath_hal_txstart(sc->sc_ah, txq->axq_qnum);
934 * Hand off a packet to the hardware (or mcast queue.)
936 * The relevant hardware txq should be locked.
939 ath_legacy_xmit_handoff(struct ath_softc *sc, struct ath_txq *txq,
942 ATH_TX_LOCK_ASSERT(sc);
945 if (if_ath_alq_checkdebug(&sc->sc_alq, ATH_ALQ_EDMA_TXDESC))
946 ath_tx_alq_post(sc, bf);
949 if (txq->axq_qnum == ATH_TXQ_SWQ)
950 ath_tx_handoff_mcast(sc, txq, bf);
952 ath_tx_handoff_hw(sc, txq, bf);
956 ath_tx_tag_crypto(struct ath_softc *sc, struct ieee80211_node *ni,
957 struct mbuf *m0, int iswep, int isfrag, int *hdrlen, int *pktlen,
960 DPRINTF(sc, ATH_DEBUG_XMIT,
961 "%s: hdrlen=%d, pktlen=%d, isfrag=%d, iswep=%d, m0=%p\n",
970 const struct ieee80211_cipher *cip;
971 struct ieee80211_key *k;
974 * Construct the 802.11 header+trailer for an encrypted
975 * frame. The only reason this can fail is because of an
976 * unknown or unsupported cipher/key type.
978 k = ieee80211_crypto_encap(ni, m0);
981 * This can happen when the key is yanked after the
982 * frame was queued. Just discard the frame; the
983 * 802.11 layer counts failures and provides
984 * debugging/diagnostics.
989 * Adjust the packet + header lengths for the crypto
990 * additions and calculate the h/w key index. When
991 * a s/w mic is done the frame will have had any mic
992 * added to it prior to entry so m0->m_pkthdr.len will
993 * account for it. Otherwise we need to add it to the
997 (*hdrlen) += cip->ic_header;
998 (*pktlen) += cip->ic_header + cip->ic_trailer;
999 /* NB: frags always have any TKIP MIC done in s/w */
1000 if ((k->wk_flags & IEEE80211_KEY_SWMIC) == 0 && !isfrag)
1001 (*pktlen) += cip->ic_miclen;
1002 (*keyix) = k->wk_keyix;
1003 } else if (ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) {
1005 * Use station key cache slot, if assigned.
1007 (*keyix) = ni->ni_ucastkey.wk_keyix;
1008 if ((*keyix) == IEEE80211_KEYIX_NONE)
1009 (*keyix) = HAL_TXKEYIX_INVALID;
1011 (*keyix) = HAL_TXKEYIX_INVALID;
1017 * Calculate whether interoperability protection is required for
1020 * This requires the rate control information be filled in,
1021 * as the protection requirement depends upon the current
1022 * operating mode / PHY.
1025 ath_tx_calc_protection(struct ath_softc *sc, struct ath_buf *bf)
1027 struct ieee80211_frame *wh;
1031 const HAL_RATE_TABLE *rt = sc->sc_currates;
1032 struct ifnet *ifp = sc->sc_ifp;
1033 struct ieee80211com *ic = ifp->if_l2com;
1035 flags = bf->bf_state.bfs_txflags;
1036 rix = bf->bf_state.bfs_rc[0].rix;
1037 shortPreamble = bf->bf_state.bfs_shpream;
1038 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1041 * If 802.11g protection is enabled, determine whether
1042 * to use RTS/CTS or just CTS. Note that this is only
1043 * done for OFDM unicast frames.
1045 if ((ic->ic_flags & IEEE80211_F_USEPROT) &&
1046 rt->info[rix].phy == IEEE80211_T_OFDM &&
1047 (flags & HAL_TXDESC_NOACK) == 0) {
1048 bf->bf_state.bfs_doprot = 1;
1049 /* XXX fragments must use CCK rates w/ protection */
1050 if (ic->ic_protmode == IEEE80211_PROT_RTSCTS) {
1051 flags |= HAL_TXDESC_RTSENA;
1052 } else if (ic->ic_protmode == IEEE80211_PROT_CTSONLY) {
1053 flags |= HAL_TXDESC_CTSENA;
1056 * For frags it would be desirable to use the
1057 * highest CCK rate for RTS/CTS. But stations
1058 * farther away may detect it at a lower CCK rate
1059 * so use the configured protection rate instead
1062 sc->sc_stats.ast_tx_protect++;
1066 * If 11n protection is enabled and it's a HT frame,
1069 * XXX ic_htprotmode or ic_curhtprotmode?
1070 * XXX should it_htprotmode only matter if ic_curhtprotmode
1071 * XXX indicates it's not a HT pure environment?
1073 if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
1074 rt->info[rix].phy == IEEE80211_T_HT &&
1075 (flags & HAL_TXDESC_NOACK) == 0) {
1076 flags |= HAL_TXDESC_RTSENA;
1077 sc->sc_stats.ast_tx_htprotect++;
1079 bf->bf_state.bfs_txflags = flags;
1083 * Update the frame duration given the currently selected rate.
1085 * This also updates the frame duration value, so it will require
1089 ath_tx_calc_duration(struct ath_softc *sc, struct ath_buf *bf)
1091 struct ieee80211_frame *wh;
1095 struct ath_hal *ah = sc->sc_ah;
1096 const HAL_RATE_TABLE *rt = sc->sc_currates;
1097 int isfrag = bf->bf_m->m_flags & M_FRAG;
1099 flags = bf->bf_state.bfs_txflags;
1100 rix = bf->bf_state.bfs_rc[0].rix;
1101 shortPreamble = bf->bf_state.bfs_shpream;
1102 wh = mtod(bf->bf_m, struct ieee80211_frame *);
1105 * Calculate duration. This logically belongs in the 802.11
1106 * layer but it lacks sufficient information to calculate it.
1108 if ((flags & HAL_TXDESC_NOACK) == 0 &&
1109 (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
1112 dur = rt->info[rix].spAckDuration;
1114 dur = rt->info[rix].lpAckDuration;
1115 if (wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG) {
1116 dur += dur; /* additional SIFS+ACK */
1118 * Include the size of next fragment so NAV is
1119 * updated properly. The last fragment uses only
1122 * XXX TODO: ensure that the rate lookup for each
1123 * fragment is the same as the rate used by the
1126 dur += ath_hal_computetxtime(ah,
1129 rix, shortPreamble);
1133 * Force hardware to use computed duration for next
1134 * fragment by disabling multi-rate retry which updates
1135 * duration based on the multi-rate duration table.
1137 bf->bf_state.bfs_ismrr = 0;
1138 bf->bf_state.bfs_try0 = ATH_TXMGTTRY;
1139 /* XXX update bfs_rc[0].try? */
1142 /* Update the duration field itself */
1143 *(u_int16_t *)wh->i_dur = htole16(dur);
1148 ath_tx_get_rtscts_rate(struct ath_hal *ah, const HAL_RATE_TABLE *rt,
1149 int cix, int shortPreamble)
1154 * CTS transmit rate is derived from the transmit rate
1155 * by looking in the h/w rate table. We must also factor
1156 * in whether or not a short preamble is to be used.
1158 /* NB: cix is set above where RTS/CTS is enabled */
1159 KASSERT(cix != 0xff, ("cix not setup"));
1160 ctsrate = rt->info[cix].rateCode;
1162 /* XXX this should only matter for legacy rates */
1164 ctsrate |= rt->info[cix].shortPreamble;
1170 * Calculate the RTS/CTS duration for legacy frames.
1173 ath_tx_calc_ctsduration(struct ath_hal *ah, int rix, int cix,
1174 int shortPreamble, int pktlen, const HAL_RATE_TABLE *rt,
1177 int ctsduration = 0;
1179 /* This mustn't be called for HT modes */
1180 if (rt->info[cix].phy == IEEE80211_T_HT) {
1181 kprintf("%s: HT rate where it shouldn't be (0x%x)\n",
1182 __func__, rt->info[cix].rateCode);
1187 * Compute the transmit duration based on the frame
1188 * size and the size of an ACK frame. We call into the
1189 * HAL to do the computation since it depends on the
1190 * characteristics of the actual PHY being used.
1192 * NB: CTS is assumed the same size as an ACK so we can
1193 * use the precalculated ACK durations.
1195 if (shortPreamble) {
1196 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1197 ctsduration += rt->info[cix].spAckDuration;
1198 ctsduration += ath_hal_computetxtime(ah,
1199 rt, pktlen, rix, AH_TRUE);
1200 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1201 ctsduration += rt->info[rix].spAckDuration;
1203 if (flags & HAL_TXDESC_RTSENA) /* SIFS + CTS */
1204 ctsduration += rt->info[cix].lpAckDuration;
1205 ctsduration += ath_hal_computetxtime(ah,
1206 rt, pktlen, rix, AH_FALSE);
1207 if ((flags & HAL_TXDESC_NOACK) == 0) /* SIFS + ACK */
1208 ctsduration += rt->info[rix].lpAckDuration;
1211 return (ctsduration);
1215 * Update the given ath_buf with updated rts/cts setup and duration
1218 * To support rate lookups for each software retry, the rts/cts rate
1219 * and cts duration must be re-calculated.
1221 * This function assumes the RTS/CTS flags have been set as needed;
1222 * mrr has been disabled; and the rate control lookup has been done.
1224 * XXX TODO: MRR need only be disabled for the pre-11n NICs.
1225 * XXX The 11n NICs support per-rate RTS/CTS configuration.
1228 ath_tx_set_rtscts(struct ath_softc *sc, struct ath_buf *bf)
1230 uint16_t ctsduration = 0;
1231 uint8_t ctsrate = 0;
1232 uint8_t rix = bf->bf_state.bfs_rc[0].rix;
1234 const HAL_RATE_TABLE *rt = sc->sc_currates;
1237 * No RTS/CTS enabled? Don't bother.
1239 if ((bf->bf_state.bfs_txflags &
1240 (HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA)) == 0) {
1241 /* XXX is this really needed? */
1242 bf->bf_state.bfs_ctsrate = 0;
1243 bf->bf_state.bfs_ctsduration = 0;
1248 * If protection is enabled, use the protection rix control
1249 * rate. Otherwise use the rate0 control rate.
1251 if (bf->bf_state.bfs_doprot)
1252 rix = sc->sc_protrix;
1254 rix = bf->bf_state.bfs_rc[0].rix;
1257 * If the raw path has hard-coded ctsrate0 to something,
1260 if (bf->bf_state.bfs_ctsrate0 != 0)
1261 cix = ath_tx_findrix(sc, bf->bf_state.bfs_ctsrate0);
1263 /* Control rate from above */
1264 cix = rt->info[rix].controlRate;
1266 /* Calculate the rtscts rate for the given cix */
1267 ctsrate = ath_tx_get_rtscts_rate(sc->sc_ah, rt, cix,
1268 bf->bf_state.bfs_shpream);
1270 /* The 11n chipsets do ctsduration calculations for you */
1271 if (! ath_tx_is_11n(sc))
1272 ctsduration = ath_tx_calc_ctsduration(sc->sc_ah, rix, cix,
1273 bf->bf_state.bfs_shpream, bf->bf_state.bfs_pktlen,
1274 rt, bf->bf_state.bfs_txflags);
1276 /* Squirrel away in ath_buf */
1277 bf->bf_state.bfs_ctsrate = ctsrate;
1278 bf->bf_state.bfs_ctsduration = ctsduration;
1281 * Must disable multi-rate retry when using RTS/CTS.
1283 if (!sc->sc_mrrprot) {
1284 bf->bf_state.bfs_ismrr = 0;
1285 bf->bf_state.bfs_try0 =
1286 bf->bf_state.bfs_rc[0].tries = ATH_TXMGTTRY; /* XXX ew */
1291 * Setup the descriptor chain for a normal or fast-frame
1294 * XXX TODO: extend to include the destination hardware QCU ID.
1295 * Make sure that is correct. Make sure that when being added
1296 * to the mcastq, the CABQ QCUID is set or things will get a bit
1300 ath_tx_setds(struct ath_softc *sc, struct ath_buf *bf)
1302 struct ath_desc *ds = bf->bf_desc;
1303 struct ath_hal *ah = sc->sc_ah;
1305 if (bf->bf_state.bfs_txrate0 == 0)
1306 DPRINTF(sc, ATH_DEBUG_XMIT,
1307 "%s: bf=%p, txrate0=%d\n", __func__, bf, 0);
1309 ath_hal_setuptxdesc(ah, ds
1310 , bf->bf_state.bfs_pktlen /* packet length */
1311 , bf->bf_state.bfs_hdrlen /* header length */
1312 , bf->bf_state.bfs_atype /* Atheros packet type */
1313 , bf->bf_state.bfs_txpower /* txpower */
1314 , bf->bf_state.bfs_txrate0
1315 , bf->bf_state.bfs_try0 /* series 0 rate/tries */
1316 , bf->bf_state.bfs_keyix /* key cache index */
1317 , bf->bf_state.bfs_txantenna /* antenna mode */
1318 , bf->bf_state.bfs_txflags /* flags */
1319 , bf->bf_state.bfs_ctsrate /* rts/cts rate */
1320 , bf->bf_state.bfs_ctsduration /* rts/cts duration */
1324 * This will be overriden when the descriptor chain is written.
1329 /* Set rate control and descriptor chain for this frame */
1330 ath_tx_set_ratectrl(sc, bf->bf_node, bf);
1331 ath_tx_chaindesclist(sc, ds, bf, 0, 0, 0);
1337 * This performs a rate lookup for the given ath_buf only if it's required.
1338 * Non-data frames and raw frames don't require it.
1340 * This populates the primary and MRR entries; MRR values are
1341 * then disabled later on if something requires it (eg RTS/CTS on
1344 * This needs to be done before the RTS/CTS fields are calculated
1345 * as they may depend upon the rate chosen.
1348 ath_tx_do_ratelookup(struct ath_softc *sc, struct ath_buf *bf)
1353 if (! bf->bf_state.bfs_doratelookup)
1356 /* Get rid of any previous state */
1357 bzero(bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1359 ATH_NODE_LOCK(ATH_NODE(bf->bf_node));
1360 ath_rate_findrate(sc, ATH_NODE(bf->bf_node), bf->bf_state.bfs_shpream,
1361 bf->bf_state.bfs_pktlen, &rix, &try0, &rate);
1363 /* In case MRR is disabled, make sure rc[0] is setup correctly */
1364 bf->bf_state.bfs_rc[0].rix = rix;
1365 bf->bf_state.bfs_rc[0].ratecode = rate;
1366 bf->bf_state.bfs_rc[0].tries = try0;
1368 if (bf->bf_state.bfs_ismrr && try0 != ATH_TXMAXTRY)
1369 ath_rate_getxtxrates(sc, ATH_NODE(bf->bf_node), rix,
1370 bf->bf_state.bfs_rc);
1371 ATH_NODE_UNLOCK(ATH_NODE(bf->bf_node));
1373 sc->sc_txrix = rix; /* for LED blinking */
1374 sc->sc_lastdatarix = rix; /* for fast frames */
1375 bf->bf_state.bfs_try0 = try0;
1376 bf->bf_state.bfs_txrate0 = rate;
1380 * Update the CLRDMASK bit in the ath_buf if it needs to be set.
1383 ath_tx_update_clrdmask(struct ath_softc *sc, struct ath_tid *tid,
1386 struct ath_node *an = ATH_NODE(bf->bf_node);
1388 ATH_TX_LOCK_ASSERT(sc);
1390 if (an->clrdmask == 1) {
1391 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1397 * Return whether this frame should be software queued or
1398 * direct dispatched.
1400 * When doing powersave, BAR frames should be queued but other management
1401 * frames should be directly sent.
1403 * When not doing powersave, stick BAR frames into the hardware queue
1404 * so it goes out even though the queue is paused.
1406 * For now, management frames are also software queued by default.
1409 ath_tx_should_swq_frame(struct ath_softc *sc, struct ath_node *an,
1410 struct mbuf *m0, int *queue_to_head)
1412 struct ieee80211_node *ni = &an->an_node;
1413 struct ieee80211_frame *wh;
1414 uint8_t type, subtype;
1416 wh = mtod(m0, struct ieee80211_frame *);
1417 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1418 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1420 (*queue_to_head) = 0;
1422 /* If it's not in powersave - direct-dispatch BAR */
1423 if ((ATH_NODE(ni)->an_is_powersave == 0)
1424 && type == IEEE80211_FC0_TYPE_CTL &&
1425 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1426 DPRINTF(sc, ATH_DEBUG_SW_TX,
1427 "%s: BAR: TX'ing direct\n", __func__);
1429 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1430 && type == IEEE80211_FC0_TYPE_CTL &&
1431 subtype == IEEE80211_FC0_SUBTYPE_BAR) {
1432 /* BAR TX whilst asleep; queue */
1433 DPRINTF(sc, ATH_DEBUG_SW_TX,
1434 "%s: swq: TX'ing\n", __func__);
1435 (*queue_to_head) = 1;
1437 } else if ((ATH_NODE(ni)->an_is_powersave == 1)
1438 && (type == IEEE80211_FC0_TYPE_MGT ||
1439 type == IEEE80211_FC0_TYPE_CTL)) {
1441 * Other control/mgmt frame; bypass software queuing
1444 DPRINTF(sc, ATH_DEBUG_XMIT,
1445 "%s: %s: Node is asleep; sending mgmt "
1446 "(type=%d, subtype=%d)\n",
1447 __func__, ath_hal_ether_sprintf(ni->ni_macaddr),
1457 * Transmit the given frame to the hardware.
1459 * The frame must already be setup; rate control must already have
1462 * XXX since the TXQ lock is being held here (and I dislike holding
1463 * it for this long when not doing software aggregation), later on
1464 * break this function into "setup_normal" and "xmit_normal". The
1465 * lock only needs to be held for the ath_tx_handoff call.
1467 * XXX we don't update the leak count here - if we're doing
1468 * direct frame dispatch, we need to be able to do it without
1469 * decrementing the leak count (eg multicast queue frames.)
1472 ath_tx_xmit_normal(struct ath_softc *sc, struct ath_txq *txq,
1475 struct ath_node *an = ATH_NODE(bf->bf_node);
1476 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
1478 ATH_TX_LOCK_ASSERT(sc);
1481 * For now, just enable CLRDMASK. ath_tx_xmit_normal() does
1482 * set a completion handler however it doesn't (yet) properly
1483 * handle the strict ordering requirements needed for normal,
1484 * non-aggregate session frames.
1486 * Once this is implemented, only set CLRDMASK like this for
1487 * frames that must go out - eg management/raw frames.
1489 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
1491 /* Setup the descriptor before handoff */
1492 ath_tx_do_ratelookup(sc, bf);
1493 ath_tx_calc_duration(sc, bf);
1494 ath_tx_calc_protection(sc, bf);
1495 ath_tx_set_rtscts(sc, bf);
1496 ath_tx_rate_fill_rcflags(sc, bf);
1497 ath_tx_setds(sc, bf);
1499 /* Track per-TID hardware queue depth correctly */
1502 /* Assign the completion handler */
1503 bf->bf_comp = ath_tx_normal_comp;
1505 /* Hand off to hardware */
1506 ath_tx_handoff(sc, txq, bf);
1510 * Do the basic frame setup stuff that's required before the frame
1511 * is added to a software queue.
1513 * All frames get mostly the same treatment and it's done once.
1514 * Retransmits fiddle with things like the rate control setup,
1515 * setting the retransmit bit in the packet; doing relevant DMA/bus
1516 * syncing and relinking it (back) into the hardware TX queue.
1518 * Note that this may cause the mbuf to be reallocated, so
1519 * m0 may not be valid.
1522 ath_tx_normal_setup(struct ath_softc *sc, struct ieee80211_node *ni,
1523 struct ath_buf *bf, struct mbuf *m0, struct ath_txq *txq)
1525 struct ieee80211vap *vap = ni->ni_vap;
1526 struct ath_hal *ah = sc->sc_ah;
1527 struct ifnet *ifp = sc->sc_ifp;
1528 struct ieee80211com *ic = ifp->if_l2com;
1529 const struct chanAccParams *cap = &ic->ic_wme.wme_chanParams;
1530 int error, iswep, ismcast, isfrag, ismrr;
1531 int keyix, hdrlen, pktlen, try0 = 0;
1532 u_int8_t rix = 0, txrate = 0;
1533 struct ath_desc *ds;
1534 struct ieee80211_frame *wh;
1535 u_int subtype, flags;
1537 const HAL_RATE_TABLE *rt;
1538 HAL_BOOL shortPreamble;
1539 struct ath_node *an;
1543 * To ensure that both sequence numbers and the CCMP PN handling
1544 * is "correct", make sure that the relevant TID queue is locked.
1545 * Otherwise the CCMP PN and seqno may appear out of order, causing
1546 * re-ordered frames to have out of order CCMP PN's, resulting
1547 * in many, many frame drops.
1549 ATH_TX_LOCK_ASSERT(sc);
1551 wh = mtod(m0, struct ieee80211_frame *);
1552 iswep = wh->i_fc[1] & IEEE80211_FC1_PROTECTED;
1553 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1554 isfrag = m0->m_flags & M_FRAG;
1555 hdrlen = ieee80211_anyhdrsize(wh);
1557 * Packet length must not include any
1558 * pad bytes; deduct them here.
1560 pktlen = m0->m_pkthdr.len - (hdrlen & 3);
1562 /* Handle encryption twiddling if needed */
1563 if (! ath_tx_tag_crypto(sc, ni, m0, iswep, isfrag, &hdrlen,
1569 /* packet header may have moved, reset our local pointer */
1570 wh = mtod(m0, struct ieee80211_frame *);
1572 pktlen += IEEE80211_CRC_LEN;
1575 * Load the DMA map so any coalescing is done. This
1576 * also calculates the number of descriptors we need.
1578 error = ath_tx_dmasetup(sc, bf, m0);
1581 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
1582 bf->bf_node = ni; /* NB: held reference */
1583 m0 = bf->bf_m; /* NB: may have changed */
1584 wh = mtod(m0, struct ieee80211_frame *);
1586 /* setup descriptors */
1588 rt = sc->sc_currates;
1589 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
1592 * NB: the 802.11 layer marks whether or not we should
1593 * use short preamble based on the current mode and
1594 * negotiated parameters.
1596 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1597 (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
1598 shortPreamble = AH_TRUE;
1599 sc->sc_stats.ast_tx_shortpre++;
1601 shortPreamble = AH_FALSE;
1605 //flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
1607 ismrr = 0; /* default no multi-rate retry*/
1608 pri = M_WME_GETAC(m0); /* honor classification */
1609 /* XXX use txparams instead of fixed values */
1611 * Calculate Atheros packet type from IEEE80211 packet header,
1612 * setup for rate calculations, and select h/w transmit queue.
1614 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
1615 case IEEE80211_FC0_TYPE_MGT:
1616 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1617 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON)
1618 atype = HAL_PKT_TYPE_BEACON;
1619 else if (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
1620 atype = HAL_PKT_TYPE_PROBE_RESP;
1621 else if (subtype == IEEE80211_FC0_SUBTYPE_ATIM)
1622 atype = HAL_PKT_TYPE_ATIM;
1624 atype = HAL_PKT_TYPE_NORMAL; /* XXX */
1625 rix = an->an_mgmtrix;
1626 txrate = rt->info[rix].rateCode;
1628 txrate |= rt->info[rix].shortPreamble;
1629 try0 = ATH_TXMGTTRY;
1630 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1632 case IEEE80211_FC0_TYPE_CTL:
1633 atype = HAL_PKT_TYPE_PSPOLL; /* stop setting of duration */
1634 rix = an->an_mgmtrix;
1635 txrate = rt->info[rix].rateCode;
1637 txrate |= rt->info[rix].shortPreamble;
1638 try0 = ATH_TXMGTTRY;
1639 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
1641 case IEEE80211_FC0_TYPE_DATA:
1642 atype = HAL_PKT_TYPE_NORMAL; /* default */
1644 * Data frames: multicast frames go out at a fixed rate,
1645 * EAPOL frames use the mgmt frame rate; otherwise consult
1646 * the rate control module for the rate to use.
1649 rix = an->an_mcastrix;
1650 txrate = rt->info[rix].rateCode;
1652 txrate |= rt->info[rix].shortPreamble;
1654 } else if (m0->m_flags & M_EAPOL) {
1655 /* XXX? maybe always use long preamble? */
1656 rix = an->an_mgmtrix;
1657 txrate = rt->info[rix].rateCode;
1659 txrate |= rt->info[rix].shortPreamble;
1660 try0 = ATH_TXMAXTRY; /* XXX?too many? */
1663 * Do rate lookup on each TX, rather than using
1664 * the hard-coded TX information decided here.
1667 bf->bf_state.bfs_doratelookup = 1;
1669 if (cap->cap_wmeParams[pri].wmep_noackPolicy)
1670 flags |= HAL_TXDESC_NOACK;
1673 if_printf(ifp, "bogus frame type 0x%x (%s)\n",
1674 wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK, __func__);
1676 /* XXX free tx dmamap */
1682 * There are two known scenarios where the frame AC doesn't match
1683 * what the destination TXQ is.
1685 * + non-QoS frames (eg management?) that the net80211 stack has
1686 * assigned a higher AC to, but since it's a non-QoS TID, it's
1687 * being thrown into TID 16. TID 16 gets the AC_BE queue.
1688 * It's quite possible that management frames should just be
1689 * direct dispatched to hardware rather than go via the software
1690 * queue; that should be investigated in the future. There are
1691 * some specific scenarios where this doesn't make sense, mostly
1692 * surrounding ADDBA request/response - hence why that is special
1695 * + Multicast frames going into the VAP mcast queue. That shows up
1698 * This driver should eventually support separate TID and TXQ locking,
1699 * allowing for arbitrary AC frames to appear on arbitrary software
1700 * queues, being queued to the "correct" hardware queue when needed.
1703 if (txq != sc->sc_ac2q[pri]) {
1704 DPRINTF(sc, ATH_DEBUG_XMIT,
1705 "%s: txq=%p (%d), pri=%d, pri txq=%p (%d)\n",
1711 sc->sc_ac2q[pri]->axq_qnum);
1716 * Calculate miscellaneous flags.
1719 flags |= HAL_TXDESC_NOACK; /* no ack on broad/multicast */
1720 } else if (pktlen > vap->iv_rtsthreshold &&
1721 (ni->ni_ath_flags & IEEE80211_NODE_FF) == 0) {
1722 flags |= HAL_TXDESC_RTSENA; /* RTS based on frame length */
1723 sc->sc_stats.ast_tx_rts++;
1725 if (flags & HAL_TXDESC_NOACK) /* NB: avoid double counting */
1726 sc->sc_stats.ast_tx_noack++;
1727 #ifdef IEEE80211_SUPPORT_TDMA
1728 if (sc->sc_tdma && (flags & HAL_TXDESC_NOACK) == 0) {
1729 DPRINTF(sc, ATH_DEBUG_TDMA,
1730 "%s: discard frame, ACK required w/ TDMA\n", __func__);
1731 sc->sc_stats.ast_tdma_ack++;
1732 /* XXX free tx dmamap */
1739 * Determine if a tx interrupt should be generated for
1740 * this descriptor. We take a tx interrupt to reap
1741 * descriptors when the h/w hits an EOL condition or
1742 * when the descriptor is specifically marked to generate
1743 * an interrupt. We periodically mark descriptors in this
1744 * way to insure timely replenishing of the supply needed
1745 * for sending frames. Defering interrupts reduces system
1746 * load and potentially allows more concurrent work to be
1747 * done but if done to aggressively can cause senders to
1750 * NB: use >= to deal with sc_txintrperiod changing
1751 * dynamically through sysctl.
1753 if (flags & HAL_TXDESC_INTREQ) {
1754 txq->axq_intrcnt = 0;
1755 } else if (++txq->axq_intrcnt >= sc->sc_txintrperiod) {
1756 flags |= HAL_TXDESC_INTREQ;
1757 txq->axq_intrcnt = 0;
1760 /* This point forward is actual TX bits */
1763 * At this point we are committed to sending the frame
1764 * and we don't need to look at m_nextpkt; clear it in
1765 * case this frame is part of frag chain.
1767 m0->m_nextpkt = NULL;
1769 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
1770 ieee80211_dump_pkt(ic, mtod(m0, const uint8_t *), m0->m_len,
1771 sc->sc_hwmap[rix].ieeerate, -1);
1773 if (ieee80211_radiotap_active_vap(vap)) {
1774 u_int64_t tsf = ath_hal_gettsf64(ah);
1776 sc->sc_tx_th.wt_tsf = htole64(tsf);
1777 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
1779 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
1781 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
1782 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
1783 sc->sc_tx_th.wt_txpower = ieee80211_get_node_txpower(ni);
1784 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
1786 ieee80211_radiotap_tx(vap, m0);
1789 /* Blank the legacy rate array */
1790 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
1793 * ath_buf_set_rate needs at least one rate/try to setup
1794 * the rate scenario.
1796 bf->bf_state.bfs_rc[0].rix = rix;
1797 bf->bf_state.bfs_rc[0].tries = try0;
1798 bf->bf_state.bfs_rc[0].ratecode = txrate;
1800 /* Store the decided rate index values away */
1801 bf->bf_state.bfs_pktlen = pktlen;
1802 bf->bf_state.bfs_hdrlen = hdrlen;
1803 bf->bf_state.bfs_atype = atype;
1804 bf->bf_state.bfs_txpower = ieee80211_get_node_txpower(ni);
1805 bf->bf_state.bfs_txrate0 = txrate;
1806 bf->bf_state.bfs_try0 = try0;
1807 bf->bf_state.bfs_keyix = keyix;
1808 bf->bf_state.bfs_txantenna = sc->sc_txantenna;
1809 bf->bf_state.bfs_txflags = flags;
1810 bf->bf_state.bfs_shpream = shortPreamble;
1812 /* XXX this should be done in ath_tx_setrate() */
1813 bf->bf_state.bfs_ctsrate0 = 0; /* ie, no hard-coded ctsrate */
1814 bf->bf_state.bfs_ctsrate = 0; /* calculated later */
1815 bf->bf_state.bfs_ctsduration = 0;
1816 bf->bf_state.bfs_ismrr = ismrr;
1822 * Queue a frame to the hardware or software queue.
1824 * This can be called by the net80211 code.
1826 * XXX what about locking? Or, push the seqno assign into the
1827 * XXX aggregate scheduler so its serialised?
1829 * XXX When sending management frames via ath_raw_xmit(),
1830 * should CLRDMASK be set unconditionally?
1833 ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni,
1834 struct ath_buf *bf, struct mbuf *m0)
1836 struct ieee80211vap *vap = ni->ni_vap;
1837 struct ath_vap *avp = ATH_VAP(vap);
1841 struct ath_txq *txq;
1843 const struct ieee80211_frame *wh;
1844 int is_ampdu, is_ampdu_tx, is_ampdu_pending;
1845 ieee80211_seq seqno;
1846 uint8_t type, subtype;
1849 ATH_TX_LOCK_ASSERT(sc);
1852 * Determine the target hardware queue.
1854 * For multicast frames, the txq gets overridden appropriately
1855 * depending upon the state of PS.
1857 * For any other frame, we do a TID/QoS lookup inside the frame
1858 * to see what the TID should be. If it's a non-QoS frame, the
1859 * AC and TID are overridden. The TID/TXQ code assumes the
1860 * TID is on a predictable hardware TXQ, so we don't support
1861 * having a node TID queued to multiple hardware TXQs.
1862 * This may change in the future but would require some locking
1865 pri = ath_tx_getac(sc, m0);
1866 tid = ath_tx_gettid(sc, m0);
1868 txq = sc->sc_ac2q[pri];
1869 wh = mtod(m0, struct ieee80211_frame *);
1870 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
1871 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
1872 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
1875 * Enforce how deep the multicast queue can grow.
1877 * XXX duplicated in ath_raw_xmit().
1879 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1880 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
1881 > sc->sc_txq_mcastq_maxdepth) {
1882 sc->sc_stats.ast_tx_mcastq_overflow++;
1889 * Enforce how deep the unicast queue can grow.
1891 * If the node is in power save then we don't want
1892 * the software queue to grow too deep, or a node may
1893 * end up consuming all of the ath_buf entries.
1895 * For now, only do this for DATA frames.
1897 * We will want to cap how many management/control
1898 * frames get punted to the software queue so it doesn't
1899 * fill up. But the correct solution isn't yet obvious.
1900 * In any case, this check should at least let frames pass
1901 * that we are direct-dispatching.
1903 * XXX TODO: duplicate this to the raw xmit path!
1905 if (type == IEEE80211_FC0_TYPE_DATA &&
1906 ATH_NODE(ni)->an_is_powersave &&
1907 ATH_NODE(ni)->an_swq_depth >
1908 sc->sc_txq_node_psq_maxdepth) {
1909 sc->sc_stats.ast_tx_node_psq_overflow++;
1915 is_ampdu_tx = ath_tx_ampdu_running(sc, ATH_NODE(ni), tid);
1916 is_ampdu_pending = ath_tx_ampdu_pending(sc, ATH_NODE(ni), tid);
1917 is_ampdu = is_ampdu_tx | is_ampdu_pending;
1919 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ac=%d, is_ampdu=%d\n",
1920 __func__, tid, pri, is_ampdu);
1922 /* Set local packet state, used to queue packets to hardware */
1923 bf->bf_state.bfs_tid = tid;
1924 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
1925 bf->bf_state.bfs_pri = pri;
1929 * When servicing one or more stations in power-save mode
1930 * (or) if there is some mcast data waiting on the mcast
1931 * queue (to prevent out of order delivery) multicast frames
1932 * must be bufferd until after the beacon.
1934 * TODO: we should lock the mcastq before we check the length.
1936 if (sc->sc_cabq_enable && ismcast && (vap->iv_ps_sta || avp->av_mcastq.axq_depth)) {
1937 txq = &avp->av_mcastq;
1939 * Mark the frame as eventually belonging on the CAB
1940 * queue, so the descriptor setup functions will
1941 * correctly initialise the descriptor 'qcuId' field.
1943 bf->bf_state.bfs_tx_queue = sc->sc_cabq->axq_qnum;
1947 /* Do the generic frame setup */
1948 /* XXX should just bzero the bf_state? */
1949 bf->bf_state.bfs_dobaw = 0;
1951 /* A-MPDU TX? Manually set sequence number */
1953 * Don't do it whilst pending; the net80211 layer still
1958 * Always call; this function will
1959 * handle making sure that null data frames
1960 * don't get a sequence number from the current
1961 * TID and thus mess with the BAW.
1963 seqno = ath_tx_tid_seqno_assign(sc, ni, bf, m0);
1966 * Don't add QoS NULL frames to the BAW.
1968 if (IEEE80211_QOS_HAS_SEQ(wh) &&
1969 subtype != IEEE80211_FC0_SUBTYPE_QOS_NULL) {
1970 bf->bf_state.bfs_dobaw = 1;
1975 * If needed, the sequence number has been assigned.
1976 * Squirrel it away somewhere easy to get to.
1978 bf->bf_state.bfs_seqno = M_SEQNO_GET(m0) << IEEE80211_SEQ_SEQ_SHIFT;
1980 /* Is ampdu pending? fetch the seqno and print it out */
1981 if (is_ampdu_pending)
1982 DPRINTF(sc, ATH_DEBUG_SW_TX,
1983 "%s: tid %d: ampdu pending, seqno %d\n",
1984 __func__, tid, M_SEQNO_GET(m0));
1986 /* This also sets up the DMA map */
1987 r = ath_tx_normal_setup(sc, ni, bf, m0, txq);
1992 /* At this point m0 could have changed! */
1997 * If it's a multicast frame, do a direct-dispatch to the
1998 * destination hardware queue. Don't bother software
2002 * If it's a BAR frame, do a direct dispatch to the
2003 * destination hardware queue. Don't bother software
2004 * queuing it, as the TID will now be paused.
2005 * Sending a BAR frame can occur from the net80211 txa timer
2006 * (ie, retries) or from the ath txtask (completion call.)
2007 * It queues directly to hardware because the TID is paused
2008 * at this point (and won't be unpaused until the BAR has
2009 * either been TXed successfully or max retries has been
2013 * Until things are better debugged - if this node is asleep
2014 * and we're sending it a non-BAR frame, direct dispatch it.
2015 * Why? Because we need to figure out what's actually being
2016 * sent - eg, during reassociation/reauthentication after
2017 * the node (last) disappeared whilst asleep, the driver should
2018 * have unpaused/unsleep'ed the node. So until that is
2019 * sorted out, use this workaround.
2021 if (txq == &avp->av_mcastq) {
2022 DPRINTF(sc, ATH_DEBUG_SW_TX,
2023 "%s: bf=%p: mcastq: TX'ing\n", __func__, bf);
2024 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2025 ath_tx_xmit_normal(sc, txq, bf);
2026 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2028 ath_tx_swq(sc, ni, txq, queue_to_head, bf);
2030 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2031 ath_tx_xmit_normal(sc, txq, bf);
2035 * For now, since there's no software queue,
2036 * direct-dispatch to the hardware.
2038 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2040 * Update the current leak count if
2041 * we're leaking frames; and set the
2042 * MORE flag as appropriate.
2044 ath_tx_leak_count_update(sc, tid, bf);
2045 ath_tx_xmit_normal(sc, txq, bf);
2052 ath_tx_raw_start(struct ath_softc *sc, struct ieee80211_node *ni,
2053 struct ath_buf *bf, struct mbuf *m0,
2054 const struct ieee80211_bpf_params *params)
2056 struct ifnet *ifp = sc->sc_ifp;
2057 struct ieee80211com *ic = ifp->if_l2com;
2058 struct ath_hal *ah = sc->sc_ah;
2059 struct ieee80211vap *vap = ni->ni_vap;
2060 int error, ismcast, ismrr;
2061 int keyix, hdrlen, pktlen, try0, txantenna;
2062 u_int8_t rix, txrate;
2063 struct ieee80211_frame *wh;
2066 const HAL_RATE_TABLE *rt;
2067 struct ath_desc *ds;
2071 uint8_t type, subtype;
2073 struct ath_node *an = ATH_NODE(ni);
2075 ATH_TX_LOCK_ASSERT(sc);
2077 wh = mtod(m0, struct ieee80211_frame *);
2078 ismcast = IEEE80211_IS_MULTICAST(wh->i_addr1);
2079 hdrlen = ieee80211_anyhdrsize(wh);
2081 * Packet length must not include any
2082 * pad bytes; deduct them here.
2084 /* XXX honor IEEE80211_BPF_DATAPAD */
2085 pktlen = m0->m_pkthdr.len - (hdrlen & 3) + IEEE80211_CRC_LEN;
2087 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
2088 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2090 ATH_KTR(sc, ATH_KTR_TX, 2,
2091 "ath_tx_raw_start: ni=%p, bf=%p, raw", ni, bf);
2093 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: ismcast=%d\n",
2096 pri = params->ibp_pri & 3;
2097 /* Override pri if the frame isn't a QoS one */
2098 if (! IEEE80211_QOS_HAS_SEQ(wh))
2099 pri = ath_tx_getac(sc, m0);
2101 /* XXX If it's an ADDBA, override the correct queue */
2102 do_override = ath_tx_action_frame_override_queue(sc, ni, m0, &o_tid);
2104 /* Map ADDBA to the correct priority */
2107 DPRINTF(sc, ATH_DEBUG_XMIT,
2108 "%s: overriding tid %d pri %d -> %d\n",
2109 __func__, o_tid, pri, TID_TO_WME_AC(o_tid));
2111 pri = TID_TO_WME_AC(o_tid);
2114 /* Handle encryption twiddling if needed */
2115 if (! ath_tx_tag_crypto(sc, ni,
2116 m0, params->ibp_flags & IEEE80211_BPF_CRYPTO, 0,
2117 &hdrlen, &pktlen, &keyix)) {
2121 /* packet header may have moved, reset our local pointer */
2122 wh = mtod(m0, struct ieee80211_frame *);
2124 /* Do the generic frame setup */
2125 /* XXX should just bzero the bf_state? */
2126 bf->bf_state.bfs_dobaw = 0;
2128 error = ath_tx_dmasetup(sc, bf, m0);
2131 m0 = bf->bf_m; /* NB: may have changed */
2132 wh = mtod(m0, struct ieee80211_frame *);
2133 KASSERT((ni != NULL), ("%s: ni=NULL!", __func__));
2134 bf->bf_node = ni; /* NB: held reference */
2136 /* Always enable CLRDMASK for raw frames for now.. */
2137 flags = HAL_TXDESC_CLRDMASK; /* XXX needed for crypto errs */
2138 flags |= HAL_TXDESC_INTREQ; /* force interrupt */
2139 if (params->ibp_flags & IEEE80211_BPF_RTS)
2140 flags |= HAL_TXDESC_RTSENA;
2141 else if (params->ibp_flags & IEEE80211_BPF_CTS) {
2142 /* XXX assume 11g/11n protection? */
2143 bf->bf_state.bfs_doprot = 1;
2144 flags |= HAL_TXDESC_CTSENA;
2146 /* XXX leave ismcast to injector? */
2147 if ((params->ibp_flags & IEEE80211_BPF_NOACK) || ismcast)
2148 flags |= HAL_TXDESC_NOACK;
2150 rt = sc->sc_currates;
2151 KASSERT(rt != NULL, ("no rate table, mode %u", sc->sc_curmode));
2153 /* Fetch first rate information */
2154 rix = ath_tx_findrix(sc, params->ibp_rate0);
2155 try0 = params->ibp_try0;
2158 * Override EAPOL rate as appropriate.
2160 if (m0->m_flags & M_EAPOL) {
2161 /* XXX? maybe always use long preamble? */
2162 rix = an->an_mgmtrix;
2163 try0 = ATH_TXMAXTRY; /* XXX?too many? */
2166 txrate = rt->info[rix].rateCode;
2167 if (params->ibp_flags & IEEE80211_BPF_SHORTPRE)
2168 txrate |= rt->info[rix].shortPreamble;
2170 ismrr = (params->ibp_try1 != 0);
2171 txantenna = params->ibp_pri >> 2;
2172 if (txantenna == 0) /* XXX? */
2173 txantenna = sc->sc_txantenna;
2176 * Since ctsrate is fixed, store it away for later
2177 * use when the descriptor fields are being set.
2179 if (flags & (HAL_TXDESC_RTSENA|HAL_TXDESC_CTSENA))
2180 bf->bf_state.bfs_ctsrate0 = params->ibp_ctsrate;
2183 * NB: we mark all packets as type PSPOLL so the h/w won't
2184 * set the sequence number, duration, etc.
2186 atype = HAL_PKT_TYPE_PSPOLL;
2188 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
2189 ieee80211_dump_pkt(ic, mtod(m0, caddr_t), m0->m_len,
2190 sc->sc_hwmap[rix].ieeerate, -1);
2192 if (ieee80211_radiotap_active_vap(vap)) {
2193 u_int64_t tsf = ath_hal_gettsf64(ah);
2195 sc->sc_tx_th.wt_tsf = htole64(tsf);
2196 sc->sc_tx_th.wt_flags = sc->sc_hwmap[rix].txflags;
2197 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)
2198 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_WEP;
2199 if (m0->m_flags & M_FRAG)
2200 sc->sc_tx_th.wt_flags |= IEEE80211_RADIOTAP_F_FRAG;
2201 sc->sc_tx_th.wt_rate = sc->sc_hwmap[rix].ieeerate;
2202 sc->sc_tx_th.wt_txpower = MIN(params->ibp_power,
2203 ieee80211_get_node_txpower(ni));
2204 sc->sc_tx_th.wt_antenna = sc->sc_txantenna;
2206 ieee80211_radiotap_tx(vap, m0);
2210 * Formulate first tx descriptor with tx controls.
2213 /* XXX check return value? */
2215 /* Store the decided rate index values away */
2216 bf->bf_state.bfs_pktlen = pktlen;
2217 bf->bf_state.bfs_hdrlen = hdrlen;
2218 bf->bf_state.bfs_atype = atype;
2219 bf->bf_state.bfs_txpower = MIN(params->ibp_power,
2220 ieee80211_get_node_txpower(ni));
2221 bf->bf_state.bfs_txrate0 = txrate;
2222 bf->bf_state.bfs_try0 = try0;
2223 bf->bf_state.bfs_keyix = keyix;
2224 bf->bf_state.bfs_txantenna = txantenna;
2225 bf->bf_state.bfs_txflags = flags;
2226 bf->bf_state.bfs_shpream =
2227 !! (params->ibp_flags & IEEE80211_BPF_SHORTPRE);
2229 /* Set local packet state, used to queue packets to hardware */
2230 bf->bf_state.bfs_tid = WME_AC_TO_TID(pri);
2231 bf->bf_state.bfs_tx_queue = sc->sc_ac2q[pri]->axq_qnum;
2232 bf->bf_state.bfs_pri = pri;
2234 /* XXX this should be done in ath_tx_setrate() */
2235 bf->bf_state.bfs_ctsrate = 0;
2236 bf->bf_state.bfs_ctsduration = 0;
2237 bf->bf_state.bfs_ismrr = ismrr;
2239 /* Blank the legacy rate array */
2240 bzero(&bf->bf_state.bfs_rc, sizeof(bf->bf_state.bfs_rc));
2242 bf->bf_state.bfs_rc[0].rix = rix;
2243 bf->bf_state.bfs_rc[0].tries = try0;
2244 bf->bf_state.bfs_rc[0].ratecode = txrate;
2249 rix = ath_tx_findrix(sc, params->ibp_rate1);
2250 bf->bf_state.bfs_rc[1].rix = rix;
2251 bf->bf_state.bfs_rc[1].tries = params->ibp_try1;
2253 rix = ath_tx_findrix(sc, params->ibp_rate2);
2254 bf->bf_state.bfs_rc[2].rix = rix;
2255 bf->bf_state.bfs_rc[2].tries = params->ibp_try2;
2257 rix = ath_tx_findrix(sc, params->ibp_rate3);
2258 bf->bf_state.bfs_rc[3].rix = rix;
2259 bf->bf_state.bfs_rc[3].tries = params->ibp_try3;
2262 * All the required rate control decisions have been made;
2263 * fill in the rc flags.
2265 ath_tx_rate_fill_rcflags(sc, bf);
2267 /* NB: no buffered multicast in power save support */
2270 * If we're overiding the ADDBA destination, dump directly
2271 * into the hardware queue, right after any pending
2272 * frames to that node are.
2274 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: dooverride=%d\n",
2275 __func__, do_override);
2279 * Put addba frames in the right place in the right TID/HWQ.
2282 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2284 * XXX if it's addba frames, should we be leaking
2285 * them out via the frame leak method?
2286 * XXX for now let's not risk it; but we may wish
2287 * to investigate this later.
2289 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2290 } else if (ath_tx_should_swq_frame(sc, ATH_NODE(ni), m0,
2292 /* Queue to software queue */
2293 ath_tx_swq(sc, ni, sc->sc_ac2q[pri], queue_to_head, bf);
2295 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2296 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2299 /* Direct-dispatch to the hardware */
2300 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
2302 * Update the current leak count if
2303 * we're leaking frames; and set the
2304 * MORE flag as appropriate.
2306 ath_tx_leak_count_update(sc, tid, bf);
2307 ath_tx_xmit_normal(sc, sc->sc_ac2q[pri], bf);
2315 * This can be called by net80211.
2318 ath_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
2319 const struct ieee80211_bpf_params *params)
2321 struct ieee80211com *ic = ni->ni_ic;
2322 struct ifnet *ifp = ic->ic_ifp;
2323 struct ath_softc *sc = ifp->if_softc;
2325 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
2329 if (sc->sc_inreset_cnt > 0) {
2330 DPRINTF(sc, ATH_DEBUG_XMIT,
2331 "%s: sc_inreset_cnt > 0; bailing\n", __func__);
2336 sc->sc_txstart_cnt++;
2339 /* Wake the hardware up already */
2340 ath_power_set_power_state(sc, HAL_PM_AWAKE);
2344 if ((ifp->if_flags & IFF_RUNNING) == 0 || sc->sc_invalid) {
2345 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: discard frame, %s", __func__,
2346 (ifp->if_flags & IFF_RUNNING) == 0 ?
2347 "!running" : "invalid");
2354 * Enforce how deep the multicast queue can grow.
2356 * XXX duplicated in ath_tx_start().
2358 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2359 if (sc->sc_cabq->axq_depth + sc->sc_cabq->fifo.axq_depth
2360 > sc->sc_txq_mcastq_maxdepth) {
2361 sc->sc_stats.ast_tx_mcastq_overflow++;
2372 * Grab a TX buffer and associated resources.
2374 bf = ath_getbuf(sc, ATH_BUFTYPE_MGMT);
2376 sc->sc_stats.ast_tx_nobuf++;
2381 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: m=%p, params=%p, bf=%p\n",
2384 if (params == NULL) {
2386 * Legacy path; interpret frame contents to decide
2387 * precisely how to send the frame.
2389 if (ath_tx_start(sc, ni, bf, m)) {
2390 error = EIO; /* XXX */
2395 * Caller supplied explicit parameters to use in
2396 * sending the frame.
2398 if (ath_tx_raw_start(sc, ni, bf, m, params)) {
2399 error = EIO; /* XXX */
2403 sc->sc_wd_timer = 5;
2405 sc->sc_stats.ast_tx_raw++;
2408 * Update the TIM - if there's anything queued to the
2409 * software queue and power save is enabled, we should
2412 ath_tx_update_tim(sc, ni, 1);
2417 sc->sc_txstart_cnt--;
2421 /* Put the hardware back to sleep if required */
2422 ath_power_restore_power_state(sc);
2427 ATH_KTR(sc, ATH_KTR_TX, 3, "ath_raw_xmit: bad2: m=%p, params=%p, "
2433 ath_returnbuf_head(sc, bf);
2434 ATH_TXBUF_UNLOCK(sc);
2440 sc->sc_txstart_cnt--;
2443 /* Put the hardware back to sleep if required */
2444 ath_power_restore_power_state(sc);
2447 ATH_KTR(sc, ATH_KTR_TX, 2, "ath_raw_xmit: bad0: m=%p, params=%p",
2450 sc->sc_stats.ast_tx_raw_fail++;
2451 ieee80211_free_node(ni);
2456 /* Some helper functions */
2459 * ADDBA (and potentially others) need to be placed in the same
2460 * hardware queue as the TID/node it's relating to. This is so
2461 * it goes out after any pending non-aggregate frames to the
2464 * If this isn't done, the ADDBA can go out before the frames
2465 * queued in hardware. Even though these frames have a sequence
2466 * number -earlier- than the ADDBA can be transmitted (but
2467 * no frames whose sequence numbers are after the ADDBA should
2468 * be!) they'll arrive after the ADDBA - and the receiving end
2469 * will simply drop them as being out of the BAW.
2471 * The frames can't be appended to the TID software queue - it'll
2472 * never be sent out. So these frames have to be directly
2473 * dispatched to the hardware, rather than queued in software.
2474 * So if this function returns true, the TXQ has to be
2475 * overridden and it has to be directly dispatched.
2477 * It's a dirty hack, but someone's gotta do it.
2481 * XXX doesn't belong here!
2484 ieee80211_is_action(struct ieee80211_frame *wh)
2486 /* Type: Management frame? */
2487 if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) !=
2488 IEEE80211_FC0_TYPE_MGT)
2491 /* Subtype: Action frame? */
2492 if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) !=
2493 IEEE80211_FC0_SUBTYPE_ACTION)
2499 #define MS(_v, _f) (((_v) & _f) >> _f##_S)
2501 * Return an alternate TID for ADDBA request frames.
2503 * Yes, this likely should be done in the net80211 layer.
2506 ath_tx_action_frame_override_queue(struct ath_softc *sc,
2507 struct ieee80211_node *ni,
2508 struct mbuf *m0, int *tid)
2510 struct ieee80211_frame *wh = mtod(m0, struct ieee80211_frame *);
2511 struct ieee80211_action_ba_addbarequest *ia;
2513 uint16_t baparamset;
2515 /* Not action frame? Bail */
2516 if (! ieee80211_is_action(wh))
2519 /* XXX Not needed for frames we send? */
2521 /* Correct length? */
2522 if (! ieee80211_parse_action(ni, m))
2526 /* Extract out action frame */
2527 frm = (u_int8_t *)&wh[1];
2528 ia = (struct ieee80211_action_ba_addbarequest *) frm;
2530 /* Not ADDBA? Bail */
2531 if (ia->rq_header.ia_category != IEEE80211_ACTION_CAT_BA)
2533 if (ia->rq_header.ia_action != IEEE80211_ACTION_BA_ADDBA_REQUEST)
2536 /* Extract TID, return it */
2537 baparamset = le16toh(ia->rq_baparamset);
2538 *tid = (int) MS(baparamset, IEEE80211_BAPS_TID);
2544 /* Per-node software queue operations */
2547 * Add the current packet to the given BAW.
2548 * It is assumed that the current packet
2550 * + fits inside the BAW;
2551 * + already has had a sequence number allocated.
2553 * Since the BAW status may be modified by both the ath task and
2554 * the net80211/ifnet contexts, the TID must be locked.
2557 ath_tx_addto_baw(struct ath_softc *sc, struct ath_node *an,
2558 struct ath_tid *tid, struct ath_buf *bf)
2561 struct ieee80211_tx_ampdu *tap;
2563 ATH_TX_LOCK_ASSERT(sc);
2565 if (bf->bf_state.bfs_isretried)
2568 tap = ath_tx_get_tx_tid(an, tid->tid);
2570 if (! bf->bf_state.bfs_dobaw) {
2571 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2572 "%s: dobaw=0, seqno=%d, window %d:%d\n",
2573 __func__, SEQNO(bf->bf_state.bfs_seqno),
2574 tap->txa_start, tap->txa_wnd);
2577 if (bf->bf_state.bfs_addedbaw)
2578 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2579 "%s: re-added? tid=%d, seqno %d; window %d:%d; "
2580 "baw head=%d tail=%d\n",
2581 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2582 tap->txa_start, tap->txa_wnd, tid->baw_head,
2586 * Verify that the given sequence number is not outside of the
2587 * BAW. Complain loudly if that's the case.
2589 if (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2590 SEQNO(bf->bf_state.bfs_seqno))) {
2591 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2592 "%s: bf=%p: outside of BAW?? tid=%d, seqno %d; window %d:%d; "
2593 "baw head=%d tail=%d\n",
2594 __func__, bf, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2595 tap->txa_start, tap->txa_wnd, tid->baw_head,
2600 * ni->ni_txseqs[] is the currently allocated seqno.
2601 * the txa state contains the current baw start.
2603 index = ATH_BA_INDEX(tap->txa_start, SEQNO(bf->bf_state.bfs_seqno));
2604 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2605 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2606 "%s: tid=%d, seqno %d; window %d:%d; index=%d cindex=%d "
2607 "baw head=%d tail=%d\n",
2608 __func__, tid->tid, SEQNO(bf->bf_state.bfs_seqno),
2609 tap->txa_start, tap->txa_wnd, index, cindex, tid->baw_head,
2614 assert(tid->tx_buf[cindex] == NULL);
2616 if (tid->tx_buf[cindex] != NULL) {
2617 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2618 "%s: ba packet dup (index=%d, cindex=%d, "
2619 "head=%d, tail=%d)\n",
2620 __func__, index, cindex, tid->baw_head, tid->baw_tail);
2621 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2622 "%s: BA bf: %p; seqno=%d ; new bf: %p; seqno=%d\n",
2624 tid->tx_buf[cindex],
2625 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno),
2627 SEQNO(bf->bf_state.bfs_seqno)
2630 tid->tx_buf[cindex] = bf;
2632 if (index >= ((tid->baw_tail - tid->baw_head) &
2633 (ATH_TID_MAX_BUFS - 1))) {
2634 tid->baw_tail = cindex;
2635 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
2640 * Flip the BAW buffer entry over from the existing one to the new one.
2642 * When software retransmitting a (sub-)frame, it is entirely possible that
2643 * the frame ath_buf is marked as BUSY and can't be immediately reused.
2644 * In that instance the buffer is cloned and the new buffer is used for
2645 * retransmit. We thus need to update the ath_buf slot in the BAW buf
2646 * tracking array to maintain consistency.
2649 ath_tx_switch_baw_buf(struct ath_softc *sc, struct ath_node *an,
2650 struct ath_tid *tid, struct ath_buf *old_bf, struct ath_buf *new_bf)
2653 struct ieee80211_tx_ampdu *tap;
2654 int seqno = SEQNO(old_bf->bf_state.bfs_seqno);
2656 ATH_TX_LOCK_ASSERT(sc);
2658 tap = ath_tx_get_tx_tid(an, tid->tid);
2659 index = ATH_BA_INDEX(tap->txa_start, seqno);
2660 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2663 * Just warn for now; if it happens then we should find out
2664 * about it. It's highly likely the aggregation session will
2667 if (old_bf->bf_state.bfs_seqno != new_bf->bf_state.bfs_seqno) {
2668 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2669 "%s: retransmitted buffer"
2670 " has mismatching seqno's, BA session may hang.\n",
2672 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2673 "%s: old seqno=%d, new_seqno=%d\n", __func__,
2674 old_bf->bf_state.bfs_seqno, new_bf->bf_state.bfs_seqno);
2677 if (tid->tx_buf[cindex] != old_bf) {
2678 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2679 "%s: ath_buf pointer incorrect; "
2680 " has m BA session may hang.\n", __func__);
2681 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2682 "%s: old bf=%p, new bf=%p\n", __func__, old_bf, new_bf);
2685 tid->tx_buf[cindex] = new_bf;
2689 * seq_start - left edge of BAW
2690 * seq_next - current/next sequence number to allocate
2692 * Since the BAW status may be modified by both the ath task and
2693 * the net80211/ifnet contexts, the TID must be locked.
2696 ath_tx_update_baw(struct ath_softc *sc, struct ath_node *an,
2697 struct ath_tid *tid, const struct ath_buf *bf)
2700 struct ieee80211_tx_ampdu *tap;
2701 int seqno = SEQNO(bf->bf_state.bfs_seqno);
2703 ATH_TX_LOCK_ASSERT(sc);
2705 tap = ath_tx_get_tx_tid(an, tid->tid);
2706 index = ATH_BA_INDEX(tap->txa_start, seqno);
2707 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
2709 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2710 "%s: tid=%d, baw=%d:%d, seqno=%d, index=%d, cindex=%d, "
2711 "baw head=%d, tail=%d\n",
2712 __func__, tid->tid, tap->txa_start, tap->txa_wnd, seqno, index,
2713 cindex, tid->baw_head, tid->baw_tail);
2716 * If this occurs then we have a big problem - something else
2717 * has slid tap->txa_start along without updating the BAW
2718 * tracking start/end pointers. Thus the TX BAW state is now
2719 * completely busted.
2721 * But for now, since I haven't yet fixed TDMA and buffer cloning,
2722 * it's quite possible that a cloned buffer is making its way
2723 * here and causing it to fire off. Disable TDMA for now.
2725 if (tid->tx_buf[cindex] != bf) {
2726 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2727 "%s: comp bf=%p, seq=%d; slot bf=%p, seqno=%d\n",
2728 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
2729 tid->tx_buf[cindex],
2730 (tid->tx_buf[cindex] != NULL) ?
2731 SEQNO(tid->tx_buf[cindex]->bf_state.bfs_seqno) : -1);
2734 tid->tx_buf[cindex] = NULL;
2736 while (tid->baw_head != tid->baw_tail &&
2737 !tid->tx_buf[tid->baw_head]) {
2738 INCR(tap->txa_start, IEEE80211_SEQ_RANGE);
2739 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
2741 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
2742 "%s: tid=%d: baw is now %d:%d, baw head=%d\n",
2743 __func__, tid->tid, tap->txa_start, tap->txa_wnd, tid->baw_head);
2747 ath_tx_leak_count_update(struct ath_softc *sc, struct ath_tid *tid,
2750 struct ieee80211_frame *wh;
2752 ATH_TX_LOCK_ASSERT(sc);
2754 if (tid->an->an_leak_count > 0) {
2755 wh = mtod(bf->bf_m, struct ieee80211_frame *);
2758 * Update MORE based on the software/net80211 queue states.
2760 if ((tid->an->an_stack_psq > 0)
2761 || (tid->an->an_swq_depth > 0))
2762 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
2764 wh->i_fc[1] &= ~IEEE80211_FC1_MORE_DATA;
2766 DPRINTF(sc, ATH_DEBUG_NODE_PWRSAVE,
2767 "%s: %s: leak count = %d, psq=%d, swq=%d, MORE=%d\n",
2769 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
2770 tid->an->an_leak_count,
2771 tid->an->an_stack_psq,
2772 tid->an->an_swq_depth,
2773 !! (wh->i_fc[1] & IEEE80211_FC1_MORE_DATA));
2776 * Re-sync the underlying buffer.
2778 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap,
2779 BUS_DMASYNC_PREWRITE);
2781 tid->an->an_leak_count --;
2786 ath_tx_tid_can_tx_or_sched(struct ath_softc *sc, struct ath_tid *tid)
2789 ATH_TX_LOCK_ASSERT(sc);
2791 if (tid->an->an_leak_count > 0) {
2800 * Mark the current node/TID as ready to TX.
2802 * This is done to make it easy for the software scheduler to
2803 * find which nodes have data to send.
2805 * The TXQ lock must be held.
2808 ath_tx_tid_sched(struct ath_softc *sc, struct ath_tid *tid)
2810 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2812 ATH_TX_LOCK_ASSERT(sc);
2815 * If we are leaking out a frame to this destination
2816 * for PS-POLL, ensure that we allow scheduling to
2819 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
2820 return; /* paused, can't schedule yet */
2823 return; /* already scheduled */
2829 * If this is a sleeping node we're leaking to, given
2830 * it a higher priority. This is so bad for QoS it hurts.
2832 if (tid->an->an_leak_count) {
2833 TAILQ_INSERT_HEAD(&txq->axq_tidq, tid, axq_qelem);
2835 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2840 * We can't do the above - it'll confuse the TXQ software
2841 * scheduler which will keep checking the _head_ TID
2842 * in the list to see if it has traffic. If we queue
2843 * a TID to the head of the list and it doesn't transmit,
2844 * we'll check it again.
2846 * So, get the rest of this leaking frames support working
2847 * and reliable first and _then_ optimise it so they're
2848 * pushed out in front of any other pending software
2851 TAILQ_INSERT_TAIL(&txq->axq_tidq, tid, axq_qelem);
2855 * Mark the current node as no longer needing to be polled for
2858 * The TXQ lock must be held.
2861 ath_tx_tid_unsched(struct ath_softc *sc, struct ath_tid *tid)
2863 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
2865 ATH_TX_LOCK_ASSERT(sc);
2867 if (tid->sched == 0)
2871 TAILQ_REMOVE(&txq->axq_tidq, tid, axq_qelem);
2875 * Assign a sequence number manually to the given frame.
2877 * This should only be called for A-MPDU TX frames.
2879 static ieee80211_seq
2880 ath_tx_tid_seqno_assign(struct ath_softc *sc, struct ieee80211_node *ni,
2881 struct ath_buf *bf, struct mbuf *m0)
2883 struct ieee80211_frame *wh;
2885 ieee80211_seq seqno;
2889 wh = mtod(m0, struct ieee80211_frame *);
2890 pri = M_WME_GETAC(m0); /* honor classification */
2891 tid = WME_AC_TO_TID(pri);
2892 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pri=%d, tid=%d, qos has seq=%d\n",
2893 __func__, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
2895 /* XXX Is it a control frame? Ignore */
2897 /* Does the packet require a sequence number? */
2898 if (! IEEE80211_QOS_HAS_SEQ(wh))
2901 ATH_TX_LOCK_ASSERT(sc);
2904 * Is it a QOS NULL Data frame? Give it a sequence number from
2905 * the default TID (IEEE80211_NONQOS_TID.)
2907 * The RX path of everything I've looked at doesn't include the NULL
2908 * data frame sequence number in the aggregation state updates, so
2909 * assigning it a sequence number there will cause a BAW hole on the
2912 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
2913 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) {
2914 /* XXX no locking for this TID? This is a bit of a problem. */
2915 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID];
2916 INCR(ni->ni_txseqs[IEEE80211_NONQOS_TID], IEEE80211_SEQ_RANGE);
2918 /* Manually assign sequence number */
2919 seqno = ni->ni_txseqs[tid];
2920 INCR(ni->ni_txseqs[tid], IEEE80211_SEQ_RANGE);
2922 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
2923 M_SEQNO_SET(m0, seqno);
2925 /* Return so caller can do something with it if needed */
2926 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: -> seqno=%d\n", __func__, seqno);
2931 * Attempt to direct dispatch an aggregate frame to hardware.
2932 * If the frame is out of BAW, queue.
2933 * Otherwise, schedule it as a single frame.
2936 ath_tx_xmit_aggr(struct ath_softc *sc, struct ath_node *an,
2937 struct ath_txq *txq, struct ath_buf *bf)
2939 struct ath_tid *tid = &an->an_tid[bf->bf_state.bfs_tid];
2940 struct ieee80211_tx_ampdu *tap;
2942 ATH_TX_LOCK_ASSERT(sc);
2944 tap = ath_tx_get_tx_tid(an, tid->tid);
2947 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
2948 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2949 /* XXX don't sched - we're paused! */
2953 /* outside baw? queue */
2954 if (bf->bf_state.bfs_dobaw &&
2955 (! BAW_WITHIN(tap->txa_start, tap->txa_wnd,
2956 SEQNO(bf->bf_state.bfs_seqno)))) {
2957 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
2958 ath_tx_tid_sched(sc, tid);
2963 * This is a temporary check and should be removed once
2964 * all the relevant code paths have been fixed.
2966 * During aggregate retries, it's possible that the head
2967 * frame will fail (which has the bfs_aggr and bfs_nframes
2968 * fields set for said aggregate) and will be retried as
2969 * a single frame. In this instance, the values should
2970 * be reset or the completion code will get upset with you.
2972 if (bf->bf_state.bfs_aggr != 0 || bf->bf_state.bfs_nframes > 1) {
2973 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
2974 "%s: bfs_aggr=%d, bfs_nframes=%d\n", __func__,
2975 bf->bf_state.bfs_aggr, bf->bf_state.bfs_nframes);
2976 bf->bf_state.bfs_aggr = 0;
2977 bf->bf_state.bfs_nframes = 1;
2980 /* Update CLRDMASK just before this frame is queued */
2981 ath_tx_update_clrdmask(sc, tid, bf);
2983 /* Direct dispatch to hardware */
2984 ath_tx_do_ratelookup(sc, bf);
2985 ath_tx_calc_duration(sc, bf);
2986 ath_tx_calc_protection(sc, bf);
2987 ath_tx_set_rtscts(sc, bf);
2988 ath_tx_rate_fill_rcflags(sc, bf);
2989 ath_tx_setds(sc, bf);
2992 sc->sc_aggr_stats.aggr_low_hwq_single_pkt++;
2994 /* Track per-TID hardware queue depth correctly */
2998 if (bf->bf_state.bfs_dobaw) {
2999 ath_tx_addto_baw(sc, an, tid, bf);
3000 bf->bf_state.bfs_addedbaw = 1;
3003 /* Set completion handler, multi-frame aggregate or not */
3004 bf->bf_comp = ath_tx_aggr_comp;
3007 * Update the current leak count if
3008 * we're leaking frames; and set the
3009 * MORE flag as appropriate.
3011 ath_tx_leak_count_update(sc, tid, bf);
3013 /* Hand off to hardware */
3014 ath_tx_handoff(sc, txq, bf);
3018 * Attempt to send the packet.
3019 * If the queue isn't busy, direct-dispatch.
3020 * If the queue is busy enough, queue the given packet on the
3021 * relevant software queue.
3024 ath_tx_swq(struct ath_softc *sc, struct ieee80211_node *ni,
3025 struct ath_txq *txq, int queue_to_head, struct ath_buf *bf)
3027 struct ath_node *an = ATH_NODE(ni);
3028 struct ieee80211_frame *wh;
3029 struct ath_tid *atid;
3031 struct mbuf *m0 = bf->bf_m;
3033 ATH_TX_LOCK_ASSERT(sc);
3035 /* Fetch the TID - non-QoS frames get assigned to TID 16 */
3036 wh = mtod(m0, struct ieee80211_frame *);
3037 pri = ath_tx_getac(sc, m0);
3038 tid = ath_tx_gettid(sc, m0);
3039 atid = &an->an_tid[tid];
3041 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p, pri=%d, tid=%d, qos=%d\n",
3042 __func__, bf, pri, tid, IEEE80211_QOS_HAS_SEQ(wh));
3044 /* Set local packet state, used to queue packets to hardware */
3045 /* XXX potentially duplicate info, re-check */
3046 bf->bf_state.bfs_tid = tid;
3047 bf->bf_state.bfs_tx_queue = txq->axq_qnum;
3048 bf->bf_state.bfs_pri = pri;
3051 * If the hardware queue isn't busy, queue it directly.
3052 * If the hardware queue is busy, queue it.
3053 * If the TID is paused or the traffic it outside BAW, software
3056 * If the node is in power-save and we're leaking a frame,
3057 * leak a single frame.
3059 if (! ath_tx_tid_can_tx_or_sched(sc, atid)) {
3060 /* TID is paused, queue */
3061 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: paused\n", __func__);
3063 * If the caller requested that it be sent at a high
3064 * priority, queue it at the head of the list.
3067 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
3069 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3070 } else if (ath_tx_ampdu_pending(sc, an, tid)) {
3071 /* AMPDU pending; queue */
3072 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: pending\n", __func__);
3073 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3075 } else if (ath_tx_ampdu_running(sc, an, tid)) {
3076 /* AMPDU running, attempt direct dispatch if possible */
3079 * Always queue the frame to the tail of the list.
3081 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3084 * If the hardware queue isn't busy, direct dispatch
3085 * the head frame in the list. Don't schedule the
3086 * TID - let it build some more frames first?
3088 * When running A-MPDU, always just check the hardware
3089 * queue depth against the aggregate frame limit.
3090 * We don't want to burst a large number of single frames
3091 * out to the hardware; we want to aggressively hold back.
3093 * Otherwise, schedule the TID.
3095 /* XXX TXQ locking */
3096 if (txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_aggr) {
3097 bf = ATH_TID_FIRST(atid);
3098 ATH_TID_REMOVE(atid, bf, bf_list);
3101 * Ensure it's definitely treated as a non-AMPDU
3102 * frame - this information may have been left
3103 * over from a previous attempt.
3105 bf->bf_state.bfs_aggr = 0;
3106 bf->bf_state.bfs_nframes = 1;
3108 /* Queue to the hardware */
3109 ath_tx_xmit_aggr(sc, an, txq, bf);
3110 DPRINTF(sc, ATH_DEBUG_SW_TX,
3114 DPRINTF(sc, ATH_DEBUG_SW_TX,
3115 "%s: ampdu; swq'ing\n",
3118 ath_tx_tid_sched(sc, atid);
3121 * If we're not doing A-MPDU, be prepared to direct dispatch
3122 * up to both limits if possible. This particular corner
3123 * case may end up with packet starvation between aggregate
3124 * traffic and non-aggregate traffic: we wnat to ensure
3125 * that non-aggregate stations get a few frames queued to the
3126 * hardware before the aggregate station(s) get their chance.
3128 * So if you only ever see a couple of frames direct dispatched
3129 * to the hardware from a non-AMPDU client, check both here
3130 * and in the software queue dispatcher to ensure that those
3131 * non-AMPDU stations get a fair chance to transmit.
3133 /* XXX TXQ locking */
3134 } else if ((txq->axq_depth + txq->fifo.axq_depth < sc->sc_hwq_limit_nonaggr) &&
3135 (txq->axq_aggr_depth < sc->sc_hwq_limit_aggr)) {
3136 /* AMPDU not running, attempt direct dispatch */
3137 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: xmit_normal\n", __func__);
3138 /* See if clrdmask needs to be set */
3139 ath_tx_update_clrdmask(sc, atid, bf);
3142 * Update the current leak count if
3143 * we're leaking frames; and set the
3144 * MORE flag as appropriate.
3146 ath_tx_leak_count_update(sc, atid, bf);
3149 * Dispatch the frame.
3151 ath_tx_xmit_normal(sc, txq, bf);
3154 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: swq'ing\n", __func__);
3155 ATH_TID_INSERT_TAIL(atid, bf, bf_list);
3156 ath_tx_tid_sched(sc, atid);
3161 * Only set the clrdmask bit if none of the nodes are currently
3164 * XXX TODO: go through all the callers and check to see
3165 * which are being called in the context of looping over all
3166 * TIDs (eg, if all tids are being paused, resumed, etc.)
3167 * That'll avoid O(n^2) complexity here.
3170 ath_tx_set_clrdmask(struct ath_softc *sc, struct ath_node *an)
3174 ATH_TX_LOCK_ASSERT(sc);
3176 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3177 if (an->an_tid[i].isfiltered == 1)
3184 * Configure the per-TID node state.
3186 * This likely belongs in if_ath_node.c but I can't think of anywhere
3187 * else to put it just yet.
3189 * This sets up the SLISTs and the mutex as appropriate.
3192 ath_tx_tid_init(struct ath_softc *sc, struct ath_node *an)
3195 struct ath_tid *atid;
3197 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
3198 atid = &an->an_tid[i];
3200 /* XXX now with this bzer(), is the field 0'ing needed? */
3201 bzero(atid, sizeof(*atid));
3203 TAILQ_INIT(&atid->tid_q);
3204 TAILQ_INIT(&atid->filtq.tid_q);
3207 for (j = 0; j < ATH_TID_MAX_BUFS; j++)
3208 atid->tx_buf[j] = NULL;
3209 atid->baw_head = atid->baw_tail = 0;
3212 atid->hwq_depth = 0;
3213 atid->cleanup_inprogress = 0;
3214 if (i == IEEE80211_NONQOS_TID)
3215 atid->ac = ATH_NONQOS_TID_AC;
3217 atid->ac = TID_TO_WME_AC(i);
3219 an->clrdmask = 1; /* Always start by setting this bit */
3223 * Pause the current TID. This stops packets from being transmitted
3226 * Since this is also called from upper layers as well as the driver,
3227 * it will get the TID lock.
3230 ath_tx_tid_pause(struct ath_softc *sc, struct ath_tid *tid)
3233 ATH_TX_LOCK_ASSERT(sc);
3235 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: [%s]: tid=%d, paused = %d\n",
3237 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3243 * Unpause the current TID, and schedule it if needed.
3246 ath_tx_tid_resume(struct ath_softc *sc, struct ath_tid *tid)
3248 ATH_TX_LOCK_ASSERT(sc);
3251 * There's some odd places where ath_tx_tid_resume() is called
3252 * when it shouldn't be; this works around that particular issue
3253 * until it's actually resolved.
3255 if (tid->paused == 0) {
3256 device_printf(sc->sc_dev,
3257 "%s: [%s]: tid=%d, paused=0?\n",
3259 ath_hal_ether_sprintf(
3260 tid->an->an_node.ni_macaddr),
3266 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3267 "%s: [%s]: tid=%d, unpaused = %d\n",
3269 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3277 * Override the clrdmask configuration for the next frame
3278 * from this TID, just to get the ball rolling.
3280 ath_tx_set_clrdmask(sc, tid->an);
3282 if (tid->axq_depth == 0)
3285 /* XXX isfiltered shouldn't ever be 0 at this point */
3286 if (tid->isfiltered == 1) {
3287 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: filtered?!\n",
3292 ath_tx_tid_sched(sc, tid);
3295 * Queue the software TX scheduler.
3297 ath_tx_swq_kick(sc);
3301 * Add the given ath_buf to the TID filtered frame list.
3302 * This requires the TID be filtered.
3305 ath_tx_tid_filt_addbuf(struct ath_softc *sc, struct ath_tid *tid,
3309 ATH_TX_LOCK_ASSERT(sc);
3311 if (!tid->isfiltered)
3312 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: not filtered?!\n",
3315 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: bf=%p\n", __func__, bf);
3317 /* Set the retry bit and bump the retry counter */
3318 ath_tx_set_retry(sc, bf);
3319 sc->sc_stats.ast_tx_swfiltered++;
3321 ATH_TID_FILT_INSERT_TAIL(tid, bf, bf_list);
3325 * Handle a completed filtered frame from the given TID.
3326 * This just enables/pauses the filtered frame state if required
3327 * and appends the filtered frame to the filtered queue.
3330 ath_tx_tid_filt_comp_buf(struct ath_softc *sc, struct ath_tid *tid,
3334 ATH_TX_LOCK_ASSERT(sc);
3336 if (! tid->isfiltered) {
3337 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d; filter transition\n",
3338 __func__, tid->tid);
3339 tid->isfiltered = 1;
3340 ath_tx_tid_pause(sc, tid);
3343 /* Add the frame to the filter queue */
3344 ath_tx_tid_filt_addbuf(sc, tid, bf);
3348 * Complete the filtered frame TX completion.
3350 * If there are no more frames in the hardware queue, unpause/unfilter
3351 * the TID if applicable. Otherwise we will wait for a node PS transition
3355 ath_tx_tid_filt_comp_complete(struct ath_softc *sc, struct ath_tid *tid)
3360 ATH_TX_LOCK_ASSERT(sc);
3362 if (tid->hwq_depth != 0)
3365 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT, "%s: tid=%d, hwq=0, transition back\n",
3366 __func__, tid->tid);
3367 if (tid->isfiltered == 1) {
3368 tid->isfiltered = 0;
3372 /* XXX ath_tx_tid_resume() also calls ath_tx_set_clrdmask()! */
3373 ath_tx_set_clrdmask(sc, tid->an);
3375 /* XXX this is really quite inefficient */
3376 while ((bf = ATH_TID_FILT_LAST(tid, ath_bufhead_s)) != NULL) {
3377 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3378 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
3381 /* And only resume if we had paused before */
3383 ath_tx_tid_resume(sc, tid);
3387 * Called when a single (aggregate or otherwise) frame is completed.
3389 * Returns 0 if the buffer could be added to the filtered list
3390 * (cloned or otherwise), 1 if the buffer couldn't be added to the
3391 * filtered list (failed clone; expired retry) and the caller should
3392 * free it and handle it like a failure (eg by sending a BAR.)
3394 * since the buffer may be cloned, bf must be not touched after this
3395 * if the return value is 0.
3398 ath_tx_tid_filt_comp_single(struct ath_softc *sc, struct ath_tid *tid,
3401 struct ath_buf *nbf;
3404 ATH_TX_LOCK_ASSERT(sc);
3407 * Don't allow a filtered frame to live forever.
3409 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3410 sc->sc_stats.ast_tx_swretrymax++;
3411 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3412 "%s: bf=%p, seqno=%d, exceeded retries\n",
3415 SEQNO(bf->bf_state.bfs_seqno));
3416 retval = 1; /* error */
3421 * A busy buffer can't be added to the retry list.
3422 * It needs to be cloned.
3424 if (bf->bf_flags & ATH_BUF_BUSY) {
3425 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3426 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3427 "%s: busy buffer clone: %p -> %p\n",
3434 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3435 "%s: busy buffer couldn't be cloned (%p)!\n",
3437 retval = 1; /* error */
3439 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3440 retval = 0; /* ok */
3443 ath_tx_tid_filt_comp_complete(sc, tid);
3449 ath_tx_tid_filt_comp_aggr(struct ath_softc *sc, struct ath_tid *tid,
3450 struct ath_buf *bf_first, ath_bufhead *bf_q)
3452 struct ath_buf *bf, *bf_next, *nbf;
3454 ATH_TX_LOCK_ASSERT(sc);
3458 bf_next = bf->bf_next;
3459 bf->bf_next = NULL; /* Remove it from the aggr list */
3462 * Don't allow a filtered frame to live forever.
3464 if (bf->bf_state.bfs_retries > SWMAX_RETRIES) {
3465 sc->sc_stats.ast_tx_swretrymax++;
3466 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3467 "%s: tid=%d, bf=%p, seqno=%d, exceeded retries\n",
3471 SEQNO(bf->bf_state.bfs_seqno));
3472 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3476 if (bf->bf_flags & ATH_BUF_BUSY) {
3477 nbf = ath_tx_retry_clone(sc, tid->an, tid, bf);
3478 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3479 "%s: tid=%d, busy buffer cloned: %p -> %p, seqno=%d\n",
3480 __func__, tid->tid, bf, nbf, SEQNO(bf->bf_state.bfs_seqno));
3486 * If the buffer couldn't be cloned, add it to bf_q;
3487 * the caller will free the buffer(s) as required.
3490 DPRINTF(sc, ATH_DEBUG_SW_TX_FILT,
3491 "%s: tid=%d, buffer couldn't be cloned! (%p) seqno=%d\n",
3492 __func__, tid->tid, bf, SEQNO(bf->bf_state.bfs_seqno));
3493 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
3495 ath_tx_tid_filt_comp_buf(sc, tid, nbf);
3501 ath_tx_tid_filt_comp_complete(sc, tid);
3505 * Suspend the queue because we need to TX a BAR.
3508 ath_tx_tid_bar_suspend(struct ath_softc *sc, struct ath_tid *tid)
3511 ATH_TX_LOCK_ASSERT(sc);
3513 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3514 "%s: tid=%d, bar_wait=%d, bar_tx=%d, called\n",
3520 /* We shouldn't be called when bar_tx is 1 */
3522 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3523 "%s: bar_tx is 1?!\n", __func__);
3526 /* If we've already been called, just be patient. */
3533 /* Only one pause, no matter how many frames fail */
3534 ath_tx_tid_pause(sc, tid);
3538 * We've finished with BAR handling - either we succeeded or
3539 * failed. Either way, unsuspend TX.
3542 ath_tx_tid_bar_unsuspend(struct ath_softc *sc, struct ath_tid *tid)
3545 ATH_TX_LOCK_ASSERT(sc);
3547 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3548 "%s: %s: TID=%d, called\n",
3550 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3553 if (tid->bar_tx == 0 || tid->bar_wait == 0) {
3554 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3555 "%s: %s: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3557 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3558 tid->tid, tid->bar_tx, tid->bar_wait);
3561 tid->bar_tx = tid->bar_wait = 0;
3562 ath_tx_tid_resume(sc, tid);
3566 * Return whether we're ready to TX a BAR frame.
3568 * Requires the TID lock be held.
3571 ath_tx_tid_bar_tx_ready(struct ath_softc *sc, struct ath_tid *tid)
3574 ATH_TX_LOCK_ASSERT(sc);
3576 if (tid->bar_wait == 0 || tid->hwq_depth > 0)
3579 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3580 "%s: %s: TID=%d, bar ready\n",
3582 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3589 * Check whether the current TID is ready to have a BAR
3590 * TXed and if so, do the TX.
3592 * Since the TID/TXQ lock can't be held during a call to
3593 * ieee80211_send_bar(), we have to do the dirty thing of unlocking it,
3594 * sending the BAR and locking it again.
3596 * Eventually, the code to send the BAR should be broken out
3597 * from this routine so the lock doesn't have to be reacquired
3598 * just to be immediately dropped by the caller.
3601 ath_tx_tid_bar_tx(struct ath_softc *sc, struct ath_tid *tid)
3603 struct ieee80211_tx_ampdu *tap;
3605 ATH_TX_LOCK_ASSERT(sc);
3607 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3608 "%s: %s: TID=%d, called\n",
3610 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3613 tap = ath_tx_get_tx_tid(tid->an, tid->tid);
3616 * This is an error condition!
3618 if (tid->bar_wait == 0 || tid->bar_tx == 1) {
3619 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3620 "%s: %s: TID=%d, bar_tx=%d, bar_wait=%d: ?\n",
3622 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3623 tid->tid, tid->bar_tx, tid->bar_wait);
3627 /* Don't do anything if we still have pending frames */
3628 if (tid->hwq_depth > 0) {
3629 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3630 "%s: %s: TID=%d, hwq_depth=%d, waiting\n",
3632 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3638 /* We're now about to TX */
3642 * Override the clrdmask configuration for the next frame,
3643 * just to get the ball rolling.
3645 ath_tx_set_clrdmask(sc, tid->an);
3648 * Calculate new BAW left edge, now that all frames have either
3649 * succeeded or failed.
3651 * XXX verify this is _actually_ the valid value to begin at!
3653 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3654 "%s: %s: TID=%d, new BAW left edge=%d\n",
3656 ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3660 /* Try sending the BAR frame */
3661 /* We can't hold the lock here! */
3664 if (ieee80211_send_bar(&tid->an->an_node, tap, tap->txa_start) == 0) {
3665 /* Success? Now we wait for notification that it's done */
3670 /* Failure? For now, warn loudly and continue */
3672 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
3673 "%s: %s: TID=%d, failed to TX BAR, continue!\n",
3674 __func__, ath_hal_ether_sprintf(tid->an->an_node.ni_macaddr),
3676 ath_tx_tid_bar_unsuspend(sc, tid);
3680 ath_tx_tid_drain_pkt(struct ath_softc *sc, struct ath_node *an,
3681 struct ath_tid *tid, ath_bufhead *bf_cq, struct ath_buf *bf)
3684 ATH_TX_LOCK_ASSERT(sc);
3687 * If the current TID is running AMPDU, update
3690 if (ath_tx_ampdu_running(sc, an, tid->tid) &&
3691 bf->bf_state.bfs_dobaw) {
3693 * Only remove the frame from the BAW if it's
3694 * been transmitted at least once; this means
3695 * the frame was in the BAW to begin with.
3697 if (bf->bf_state.bfs_retries > 0) {
3698 ath_tx_update_baw(sc, an, tid, bf);
3699 bf->bf_state.bfs_dobaw = 0;
3703 * This has become a non-fatal error now
3705 if (! bf->bf_state.bfs_addedbaw)
3706 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW
3707 "%s: wasn't added: seqno %d\n",
3708 __func__, SEQNO(bf->bf_state.bfs_seqno));
3712 /* Strip it out of an aggregate list if it was in one */
3715 /* Insert on the free queue to be freed by the caller */
3716 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
3720 ath_tx_tid_drain_print(struct ath_softc *sc, struct ath_node *an,
3721 const char *pfx, struct ath_tid *tid, struct ath_buf *bf)
3723 struct ieee80211_node *ni = &an->an_node;
3724 struct ath_txq *txq;
3725 struct ieee80211_tx_ampdu *tap;
3727 txq = sc->sc_ac2q[tid->ac];
3728 tap = ath_tx_get_tx_tid(an, tid->tid);
3730 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3731 "%s: %s: %s: bf=%p: addbaw=%d, dobaw=%d, "
3732 "seqno=%d, retry=%d\n",
3735 ath_hal_ether_sprintf(ni->ni_macaddr),
3737 bf->bf_state.bfs_addedbaw,
3738 bf->bf_state.bfs_dobaw,
3739 SEQNO(bf->bf_state.bfs_seqno),
3740 bf->bf_state.bfs_retries);
3741 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3742 "%s: %s: %s: bf=%p: txq[%d] axq_depth=%d, axq_aggr_depth=%d\n",
3745 ath_hal_ether_sprintf(ni->ni_macaddr),
3749 txq->axq_aggr_depth);
3750 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3751 "%s: %s: %s: bf=%p: tid txq_depth=%d hwq_depth=%d, bar_wait=%d, "
3755 ath_hal_ether_sprintf(ni->ni_macaddr),
3761 DPRINTF(sc, ATH_DEBUG_SW_TX | ATH_DEBUG_RESET,
3762 "%s: %s: %s: tid %d: "
3763 "sched=%d, paused=%d, "
3764 "incomp=%d, baw_head=%d, "
3765 "baw_tail=%d txa_start=%d, ni_txseqs=%d\n",
3768 ath_hal_ether_sprintf(ni->ni_macaddr),
3770 tid->sched, tid->paused,
3771 tid->incomp, tid->baw_head,
3772 tid->baw_tail, tap == NULL ? -1 : tap->txa_start,
3773 ni->ni_txseqs[tid->tid]);
3775 /* XXX Dump the frame, see what it is? */
3776 if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
3777 ieee80211_dump_pkt(ni->ni_ic,
3778 mtod(bf->bf_m, const uint8_t *),
3779 bf->bf_m->m_len, 0, -1);
3783 * Free any packets currently pending in the software TX queue.
3785 * This will be called when a node is being deleted.
3787 * It can also be called on an active node during an interface
3788 * reset or state transition.
3790 * (From Linux/reference):
3792 * TODO: For frame(s) that are in the retry state, we will reuse the
3793 * sequence number(s) without setting the retry bit. The
3794 * alternative is to give up on these and BAR the receiver's window
3798 ath_tx_tid_drain(struct ath_softc *sc, struct ath_node *an,
3799 struct ath_tid *tid, ath_bufhead *bf_cq)
3802 struct ieee80211_tx_ampdu *tap;
3803 struct ieee80211_node *ni = &an->an_node;
3806 tap = ath_tx_get_tx_tid(an, tid->tid);
3808 ATH_TX_LOCK_ASSERT(sc);
3810 /* Walk the queue, free frames */
3813 bf = ATH_TID_FIRST(tid);
3819 ath_tx_tid_drain_print(sc, an, "norm", tid, bf);
3823 ATH_TID_REMOVE(tid, bf, bf_list);
3824 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3827 /* And now, drain the filtered frame queue */
3830 bf = ATH_TID_FILT_FIRST(tid);
3835 ath_tx_tid_drain_print(sc, an, "filt", tid, bf);
3839 ATH_TID_FILT_REMOVE(tid, bf, bf_list);
3840 ath_tx_tid_drain_pkt(sc, an, tid, bf_cq, bf);
3844 * Override the clrdmask configuration for the next frame
3845 * in case there is some future transmission, just to get
3848 * This won't hurt things if the TID is about to be freed.
3850 ath_tx_set_clrdmask(sc, tid->an);
3853 * Now that it's completed, grab the TID lock and update
3854 * the sequence number and BAW window.
3855 * Because sequence numbers have been assigned to frames
3856 * that haven't been sent yet, it's entirely possible
3857 * we'll be called with some pending frames that have not
3860 * The cleaner solution is to do the sequence number allocation
3861 * when the packet is first transmitted - and thus the "retries"
3862 * check above would be enough to update the BAW/seqno.
3865 /* But don't do it for non-QoS TIDs */
3868 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
3869 "%s: %s: node %p: TID %d: sliding BAW left edge to %d\n",
3871 ath_hal_ether_sprintf(ni->ni_macaddr),
3876 ni->ni_txseqs[tid->tid] = tap->txa_start;
3877 tid->baw_tail = tid->baw_head;
3882 * Reset the TID state. This must be only called once the node has
3883 * had its frames flushed from this TID, to ensure that no other
3884 * pause / unpause logic can kick in.
3887 ath_tx_tid_reset(struct ath_softc *sc, struct ath_tid *tid)
3891 tid->bar_wait = tid->bar_tx = tid->isfiltered = 0;
3892 tid->paused = tid->sched = tid->addba_tx_pending = 0;
3893 tid->incomp = tid->cleanup_inprogress = 0;
3897 * If we have a bar_wait set, we need to unpause the TID
3898 * here. Otherwise once cleanup has finished, the TID won't
3899 * have the right paused counter.
3901 * XXX I'm not going through resume here - I don't want the
3902 * node to be rescheuled just yet. This however should be
3905 if (tid->bar_wait) {
3906 if (tid->paused > 0) {
3912 * XXX same with a currently filtered TID.
3914 * Since this is being called during a flush, we assume that
3915 * the filtered frame list is actually empty.
3917 * XXX TODO: add in a check to ensure that the filtered queue
3918 * depth is actually 0!
3920 if (tid->isfiltered) {
3921 if (tid->paused > 0) {
3927 * Clear BAR, filtered frames, scheduled and ADDBA pending.
3928 * The TID may be going through cleanup from the last association
3929 * where things in the BAW are still in the hardware queue.
3933 tid->isfiltered = 0;
3935 tid->addba_tx_pending = 0;
3938 * XXX TODO: it may just be enough to walk the HWQs and mark
3939 * frames for that node as non-aggregate; or mark the ath_node
3940 * with something that indicates that aggregation is no longer
3941 * occuring. Then we can just toss the BAW complaints and
3942 * do a complete hard reset of state here - no pause, no
3943 * complete counter, etc.
3949 * Flush all software queued packets for the given node.
3951 * This occurs when a completion handler frees the last buffer
3952 * for a node, and the node is thus freed. This causes the node
3953 * to be cleaned up, which ends up calling ath_tx_node_flush.
3956 ath_tx_node_flush(struct ath_softc *sc, struct ath_node *an)
3964 ATH_KTR(sc, ATH_KTR_NODE, 1, "ath_tx_node_flush: flush node; ni=%p",
3968 DPRINTF(sc, ATH_DEBUG_NODE,
3969 "%s: %s: flush; is_powersave=%d, stack_psq=%d, tim=%d, "
3970 "swq_depth=%d, clrdmask=%d, leak_count=%d\n",
3972 ath_hal_ether_sprintf(an->an_node.ni_macaddr),
3973 an->an_is_powersave,
3980 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
3981 struct ath_tid *atid = &an->an_tid[tid];
3984 ath_tx_tid_drain(sc, an, atid, &bf_cq);
3986 /* Remove this tid from the list of active tids */
3987 ath_tx_tid_unsched(sc, atid);
3989 /* Reset the per-TID pause, BAR, etc state */
3990 ath_tx_tid_reset(sc, atid);
3994 * Clear global leak count
3996 an->an_leak_count = 0;
3999 /* Handle completed frames */
4000 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4001 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4002 ath_tx_default_comp(sc, bf, 0);
4007 * Drain all the software TXQs currently with traffic queued.
4010 ath_tx_txq_drain(struct ath_softc *sc, struct ath_txq *txq)
4012 struct ath_tid *tid;
4020 * Iterate over all active tids for the given txq,
4021 * flushing and unsched'ing them
4023 while (! TAILQ_EMPTY(&txq->axq_tidq)) {
4024 tid = TAILQ_FIRST(&txq->axq_tidq);
4025 ath_tx_tid_drain(sc, tid->an, tid, &bf_cq);
4026 ath_tx_tid_unsched(sc, tid);
4031 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4032 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4033 ath_tx_default_comp(sc, bf, 0);
4038 * Handle completion of non-aggregate session frames.
4040 * This (currently) doesn't implement software retransmission of
4041 * non-aggregate frames!
4043 * Software retransmission of non-aggregate frames needs to obey
4044 * the strict sequence number ordering, and drop any frames that
4047 * For now, filtered frames and frame transmission will cause
4048 * all kinds of issues. So we don't support them.
4050 * So anyone queuing frames via ath_tx_normal_xmit() or
4051 * ath_tx_hw_queue_norm() must override and set CLRDMASK.
4054 ath_tx_normal_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
4056 struct ieee80211_node *ni = bf->bf_node;
4057 struct ath_node *an = ATH_NODE(ni);
4058 int tid = bf->bf_state.bfs_tid;
4059 struct ath_tid *atid = &an->an_tid[tid];
4060 struct ath_tx_status *ts = &bf->bf_status.ds_txstat;
4062 /* The TID state is protected behind the TXQ lock */
4065 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bf=%p: fail=%d, hwq_depth now %d\n",
4066 __func__, bf, fail, atid->hwq_depth - 1);
4072 * If the frame was filtered, stick it on the filter frame
4073 * queue and complain about it. It shouldn't happen!
4075 if ((ts->ts_status & HAL_TXERR_FILT) ||
4076 (ts->ts_status != 0 && atid->isfiltered)) {
4077 DPRINTF(sc, ATH_DEBUG_SW_TX,
4078 "%s: isfiltered=%d, ts_status=%d: huh?\n",
4082 ath_tx_tid_filt_comp_buf(sc, atid, bf);
4085 if (atid->isfiltered)
4086 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: filtered?!\n", __func__);
4087 if (atid->hwq_depth < 0)
4088 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
4089 __func__, atid->hwq_depth);
4091 /* If the TID is being cleaned up, track things */
4093 if (atid->cleanup_inprogress) {
4095 if (atid->incomp == 0) {
4096 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4097 "%s: TID %d: cleaned up! resume!\n",
4099 atid->cleanup_inprogress = 0;
4100 ath_tx_tid_resume(sc, atid);
4105 * If the queue is filtered, potentially mark it as complete
4106 * and reschedule it as needed.
4108 * This is required as there may be a subsequent TX descriptor
4109 * for this end-node that has CLRDMASK set, so it's quite possible
4110 * that a filtered frame will be followed by a non-filtered
4111 * (complete or otherwise) frame.
4113 * XXX should we do this before we complete the frame?
4115 if (atid->isfiltered)
4116 ath_tx_tid_filt_comp_complete(sc, atid);
4120 * punt to rate control if we're not being cleaned up
4121 * during a hw queue drain and the frame wanted an ACK.
4123 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
4124 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
4125 ts, bf->bf_state.bfs_pktlen,
4126 1, (ts->ts_status == 0) ? 0 : 1);
4128 ath_tx_default_comp(sc, bf, fail);
4132 * Handle cleanup of aggregate session packets that aren't
4135 * There's no need to update the BAW here - the session is being
4139 ath_tx_comp_cleanup_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4141 struct ieee80211_node *ni = bf->bf_node;
4142 struct ath_node *an = ATH_NODE(ni);
4143 int tid = bf->bf_state.bfs_tid;
4144 struct ath_tid *atid = &an->an_tid[tid];
4146 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: TID %d: incomp=%d\n",
4147 __func__, tid, atid->incomp);
4153 if (bf->bf_state.bfs_dobaw) {
4154 ath_tx_update_baw(sc, an, atid, bf);
4155 if (!bf->bf_state.bfs_addedbaw)
4156 DPRINTF(sc, ATH_DEBUG_SW_TX,
4157 "%s: wasn't added: seqno %d\n",
4158 __func__, SEQNO(bf->bf_state.bfs_seqno));
4161 if (atid->incomp == 0) {
4162 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4163 "%s: TID %d: cleaned up! resume!\n",
4165 atid->cleanup_inprogress = 0;
4166 ath_tx_tid_resume(sc, atid);
4170 ath_tx_default_comp(sc, bf, 0);
4175 * This as it currently stands is a bit dumb. Ideally we'd just
4176 * fail the frame the normal way and have it permanently fail
4177 * via the normal aggregate completion path.
4180 ath_tx_tid_cleanup_frame(struct ath_softc *sc, struct ath_node *an,
4181 int tid, struct ath_buf *bf_head, ath_bufhead *bf_cq)
4183 struct ath_tid *atid = &an->an_tid[tid];
4184 struct ath_buf *bf, *bf_next;
4186 ATH_TX_LOCK_ASSERT(sc);
4189 * Remove this frame from the queue.
4191 ATH_TID_REMOVE(atid, bf_head, bf_list);
4194 * Loop over all the frames in the aggregate.
4197 while (bf != NULL) {
4198 bf_next = bf->bf_next; /* next aggregate frame, or NULL */
4201 * If it's been added to the BAW we need to kick
4202 * it out of the BAW before we continue.
4204 * XXX if it's an aggregate, assert that it's in the
4205 * BAW - we shouldn't have it be in an aggregate
4208 if (bf->bf_state.bfs_addedbaw) {
4209 ath_tx_update_baw(sc, an, atid, bf);
4210 bf->bf_state.bfs_dobaw = 0;
4214 * Give it the default completion handler.
4216 bf->bf_comp = ath_tx_normal_comp;
4220 * Add it to the list to free.
4222 TAILQ_INSERT_TAIL(bf_cq, bf, bf_list);
4225 * Now advance to the next frame in the aggregate.
4232 * Performs transmit side cleanup when TID changes from aggregated to
4233 * unaggregated and during reassociation.
4235 * For now, this just tosses everything from the TID software queue
4236 * whether or not it has been retried and marks the TID as
4237 * pending completion if there's anything for this TID queued to
4240 * The caller is responsible for pausing the TID and unpausing the
4241 * TID if no cleanup was required. Otherwise the cleanup path will
4242 * unpause the TID once the last hardware queued frame is completed.
4245 ath_tx_tid_cleanup(struct ath_softc *sc, struct ath_node *an, int tid,
4248 struct ath_tid *atid = &an->an_tid[tid];
4249 struct ath_buf *bf, *bf_next;
4251 ATH_TX_LOCK_ASSERT(sc);
4253 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4254 "%s: TID %d: called; inprogress=%d\n", __func__, tid,
4255 atid->cleanup_inprogress);
4258 * Move the filtered frames to the TX queue, before
4259 * we run off and discard/process things.
4262 /* XXX this is really quite inefficient */
4263 while ((bf = ATH_TID_FILT_LAST(atid, ath_bufhead_s)) != NULL) {
4264 ATH_TID_FILT_REMOVE(atid, bf, bf_list);
4265 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4269 * Update the frames in the software TX queue:
4271 * + Discard retry frames in the queue
4272 * + Fix the completion function to be non-aggregate
4274 bf = ATH_TID_FIRST(atid);
4277 * Grab the next frame in the list, we may
4278 * be fiddling with the list.
4280 bf_next = TAILQ_NEXT(bf, bf_list);
4283 * Free the frame and all subframes.
4285 ath_tx_tid_cleanup_frame(sc, an, tid, bf, bf_cq);
4294 * If there's anything in the hardware queue we wait
4295 * for the TID HWQ to empty.
4297 if (atid->hwq_depth > 0) {
4299 * XXX how about we kill atid->incomp, and instead
4300 * replace it with a macro that checks that atid->hwq_depth
4303 atid->incomp = atid->hwq_depth;
4304 atid->cleanup_inprogress = 1;
4307 if (atid->cleanup_inprogress)
4308 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4309 "%s: TID %d: cleanup needed: %d packets\n",
4310 __func__, tid, atid->incomp);
4312 /* Owner now must free completed frames */
4315 static struct ath_buf *
4316 ath_tx_retry_clone(struct ath_softc *sc, struct ath_node *an,
4317 struct ath_tid *tid, struct ath_buf *bf)
4319 struct ath_buf *nbf;
4323 * Clone the buffer. This will handle the dma unmap and
4324 * copy the node reference to the new buffer. If this
4325 * works out, 'bf' will have no DMA mapping, no mbuf
4326 * pointer and no node reference.
4328 nbf = ath_buf_clone(sc, bf);
4331 DPRINTF(sc, ATH_DEBUG_XMIT, "%s: ATH_BUF_BUSY; cloning\n",
4336 /* Failed to clone */
4337 DPRINTF(sc, ATH_DEBUG_XMIT,
4338 "%s: failed to clone a busy buffer\n",
4343 /* Setup the dma for the new buffer */
4344 error = ath_tx_dmasetup(sc, nbf, nbf->bf_m);
4346 DPRINTF(sc, ATH_DEBUG_XMIT,
4347 "%s: failed to setup dma for clone\n",
4350 * Put this at the head of the list, not tail;
4351 * that way it doesn't interfere with the
4352 * busy buffer logic (which uses the tail of
4356 ath_returnbuf_head(sc, nbf);
4357 ATH_TXBUF_UNLOCK(sc);
4361 /* Update BAW if required, before we free the original buf */
4362 if (bf->bf_state.bfs_dobaw)
4363 ath_tx_switch_baw_buf(sc, an, tid, bf, nbf);
4365 /* Free original buffer; return new buffer */
4366 ath_freebuf(sc, bf);
4372 * Handle retrying an unaggregate frame in an aggregate
4375 * If too many retries occur, pause the TID, wait for
4376 * any further retransmits (as there's no reason why
4377 * non-aggregate frames in an aggregate session are
4378 * transmitted in-order; they just have to be in-BAW)
4379 * and then queue a BAR.
4382 ath_tx_aggr_retry_unaggr(struct ath_softc *sc, struct ath_buf *bf)
4384 struct ieee80211_node *ni = bf->bf_node;
4385 struct ath_node *an = ATH_NODE(ni);
4386 int tid = bf->bf_state.bfs_tid;
4387 struct ath_tid *atid = &an->an_tid[tid];
4388 struct ieee80211_tx_ampdu *tap;
4392 tap = ath_tx_get_tx_tid(an, tid);
4395 * If the buffer is marked as busy, we can't directly
4396 * reuse it. Instead, try to clone the buffer.
4397 * If the clone is successful, recycle the old buffer.
4398 * If the clone is unsuccessful, set bfs_retries to max
4399 * to force the next bit of code to free the buffer
4402 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4403 (bf->bf_flags & ATH_BUF_BUSY)) {
4404 struct ath_buf *nbf;
4405 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4407 /* bf has been freed at this point */
4410 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4413 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4414 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4415 "%s: exceeded retries; seqno %d\n",
4416 __func__, SEQNO(bf->bf_state.bfs_seqno));
4417 sc->sc_stats.ast_tx_swretrymax++;
4419 /* Update BAW anyway */
4420 if (bf->bf_state.bfs_dobaw) {
4421 ath_tx_update_baw(sc, an, atid, bf);
4422 if (! bf->bf_state.bfs_addedbaw)
4423 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4424 "%s: wasn't added: seqno %d\n",
4425 __func__, SEQNO(bf->bf_state.bfs_seqno));
4427 bf->bf_state.bfs_dobaw = 0;
4429 /* Suspend the TX queue and get ready to send the BAR */
4430 ath_tx_tid_bar_suspend(sc, atid);
4432 /* Send the BAR if there are no other frames waiting */
4433 if (ath_tx_tid_bar_tx_ready(sc, atid))
4434 ath_tx_tid_bar_tx(sc, atid);
4438 /* Free buffer, bf is free after this call */
4439 ath_tx_default_comp(sc, bf, 0);
4444 * This increments the retry counter as well as
4445 * sets the retry flag in the ath_buf and packet
4448 ath_tx_set_retry(sc, bf);
4449 sc->sc_stats.ast_tx_swretries++;
4452 * Insert this at the head of the queue, so it's
4453 * retried before any current/subsequent frames.
4455 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4456 ath_tx_tid_sched(sc, atid);
4457 /* Send the BAR if there are no other frames waiting */
4458 if (ath_tx_tid_bar_tx_ready(sc, atid))
4459 ath_tx_tid_bar_tx(sc, atid);
4465 * Common code for aggregate excessive retry/subframe retry.
4466 * If retrying, queues buffers to bf_q. If not, frees the
4469 * XXX should unify this with ath_tx_aggr_retry_unaggr()
4472 ath_tx_retry_subframe(struct ath_softc *sc, struct ath_buf *bf,
4475 struct ieee80211_node *ni = bf->bf_node;
4476 struct ath_node *an = ATH_NODE(ni);
4477 int tid = bf->bf_state.bfs_tid;
4478 struct ath_tid *atid = &an->an_tid[tid];
4480 ATH_TX_LOCK_ASSERT(sc);
4482 /* XXX clr11naggr should be done for all subframes */
4483 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
4484 ath_hal_set11nburstduration(sc->sc_ah, bf->bf_desc, 0);
4486 /* ath_hal_set11n_virtualmorefrag(sc->sc_ah, bf->bf_desc, 0); */
4489 * If the buffer is marked as busy, we can't directly
4490 * reuse it. Instead, try to clone the buffer.
4491 * If the clone is successful, recycle the old buffer.
4492 * If the clone is unsuccessful, set bfs_retries to max
4493 * to force the next bit of code to free the buffer
4496 if ((bf->bf_state.bfs_retries < SWMAX_RETRIES) &&
4497 (bf->bf_flags & ATH_BUF_BUSY)) {
4498 struct ath_buf *nbf;
4499 nbf = ath_tx_retry_clone(sc, an, atid, bf);
4501 /* bf has been freed at this point */
4504 bf->bf_state.bfs_retries = SWMAX_RETRIES + 1;
4507 if (bf->bf_state.bfs_retries >= SWMAX_RETRIES) {
4508 sc->sc_stats.ast_tx_swretrymax++;
4509 DPRINTF(sc, ATH_DEBUG_SW_TX_RETRIES,
4510 "%s: max retries: seqno %d\n",
4511 __func__, SEQNO(bf->bf_state.bfs_seqno));
4512 ath_tx_update_baw(sc, an, atid, bf);
4513 if (!bf->bf_state.bfs_addedbaw)
4514 DPRINTF(sc, ATH_DEBUG_SW_TX_BAW,
4515 "%s: wasn't added: seqno %d\n",
4516 __func__, SEQNO(bf->bf_state.bfs_seqno));
4517 bf->bf_state.bfs_dobaw = 0;
4521 ath_tx_set_retry(sc, bf);
4522 sc->sc_stats.ast_tx_swretries++;
4523 bf->bf_next = NULL; /* Just to make sure */
4525 /* Clear the aggregate state */
4526 bf->bf_state.bfs_aggr = 0;
4527 bf->bf_state.bfs_ndelim = 0; /* ??? needed? */
4528 bf->bf_state.bfs_nframes = 1;
4530 TAILQ_INSERT_TAIL(bf_q, bf, bf_list);
4535 * error pkt completion for an aggregate destination
4538 ath_tx_comp_aggr_error(struct ath_softc *sc, struct ath_buf *bf_first,
4539 struct ath_tid *tid)
4541 struct ieee80211_node *ni = bf_first->bf_node;
4542 struct ath_node *an = ATH_NODE(ni);
4543 struct ath_buf *bf_next, *bf;
4546 struct ieee80211_tx_ampdu *tap;
4553 * Update rate control - all frames have failed.
4555 * XXX use the length in the first frame in the series;
4556 * XXX just so things are consistent for now.
4558 ath_tx_update_ratectrl(sc, ni, bf_first->bf_state.bfs_rc,
4559 &bf_first->bf_status.ds_txstat,
4560 bf_first->bf_state.bfs_pktlen,
4561 bf_first->bf_state.bfs_nframes, bf_first->bf_state.bfs_nframes);
4564 tap = ath_tx_get_tx_tid(an, tid->tid);
4565 sc->sc_stats.ast_tx_aggr_failall++;
4567 /* Retry all subframes */
4570 bf_next = bf->bf_next;
4571 bf->bf_next = NULL; /* Remove it from the aggr list */
4572 sc->sc_stats.ast_tx_aggr_fail++;
4573 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4576 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4581 /* Prepend all frames to the beginning of the queue */
4582 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4583 TAILQ_REMOVE(&bf_q, bf, bf_list);
4584 ATH_TID_INSERT_HEAD(tid, bf, bf_list);
4588 * Schedule the TID to be re-tried.
4590 ath_tx_tid_sched(sc, tid);
4593 * send bar if we dropped any frames
4595 * Keep the txq lock held for now, as we need to ensure
4596 * that ni_txseqs[] is consistent (as it's being updated
4597 * in the ifnet TX context or raw TX context.)
4600 /* Suspend the TX queue and get ready to send the BAR */
4601 ath_tx_tid_bar_suspend(sc, tid);
4605 * Send BAR if required
4607 if (ath_tx_tid_bar_tx_ready(sc, tid))
4608 ath_tx_tid_bar_tx(sc, tid);
4612 /* Complete frames which errored out */
4613 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
4614 TAILQ_REMOVE(&bf_cq, bf, bf_list);
4615 ath_tx_default_comp(sc, bf, 0);
4620 * Handle clean-up of packets from an aggregate list.
4622 * There's no need to update the BAW here - the session is being
4626 ath_tx_comp_cleanup_aggr(struct ath_softc *sc, struct ath_buf *bf_first)
4628 struct ath_buf *bf, *bf_next;
4629 struct ieee80211_node *ni = bf_first->bf_node;
4630 struct ath_node *an = ATH_NODE(ni);
4631 int tid = bf_first->bf_state.bfs_tid;
4632 struct ath_tid *atid = &an->an_tid[tid];
4639 /* Update the BAW */
4643 if (bf->bf_state.bfs_dobaw) {
4644 ath_tx_update_baw(sc, an, atid, bf);
4645 if (!bf->bf_state.bfs_addedbaw)
4646 DPRINTF(sc, ATH_DEBUG_SW_TX,
4647 "%s: wasn't added: seqno %d\n",
4648 __func__, SEQNO(bf->bf_state.bfs_seqno));
4653 if (atid->incomp == 0) {
4654 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
4655 "%s: TID %d: cleaned up! resume!\n",
4657 atid->cleanup_inprogress = 0;
4658 ath_tx_tid_resume(sc, atid);
4661 /* Send BAR if required */
4662 /* XXX why would we send a BAR when transitioning to non-aggregation? */
4664 * XXX TODO: we should likely just tear down the BAR state here,
4665 * rather than sending a BAR.
4667 if (ath_tx_tid_bar_tx_ready(sc, atid))
4668 ath_tx_tid_bar_tx(sc, atid);
4672 /* Handle frame completion as individual frames */
4675 bf_next = bf->bf_next;
4677 ath_tx_default_comp(sc, bf, 1);
4683 * Handle completion of an set of aggregate frames.
4685 * Note: the completion handler is the last descriptor in the aggregate,
4686 * not the last descriptor in the first frame.
4689 ath_tx_aggr_comp_aggr(struct ath_softc *sc, struct ath_buf *bf_first,
4692 //struct ath_desc *ds = bf->bf_lastds;
4693 struct ieee80211_node *ni = bf_first->bf_node;
4694 struct ath_node *an = ATH_NODE(ni);
4695 int tid = bf_first->bf_state.bfs_tid;
4696 struct ath_tid *atid = &an->an_tid[tid];
4697 struct ath_tx_status ts;
4698 struct ieee80211_tx_ampdu *tap;
4704 struct ath_buf *bf, *bf_next;
4707 int nframes = 0, nbad = 0, nf;
4709 /* XXX there's too much on the stack? */
4710 struct ath_rc_series rc[ATH_RC_NUM];
4713 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: called; hwq_depth=%d\n",
4714 __func__, atid->hwq_depth);
4717 * Take a copy; this may be needed -after- bf_first
4718 * has been completed and freed.
4720 ts = bf_first->bf_status.ds_txstat;
4725 /* The TID state is kept behind the TXQ lock */
4729 if (atid->hwq_depth < 0)
4730 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: hwq_depth < 0: %d\n",
4731 __func__, atid->hwq_depth);
4734 * If the TID is filtered, handle completing the filter
4735 * transition before potentially kicking it to the cleanup
4738 * XXX this is duplicate work, ew.
4740 if (atid->isfiltered)
4741 ath_tx_tid_filt_comp_complete(sc, atid);
4744 * Punt cleanup to the relevant function, not our problem now
4746 if (atid->cleanup_inprogress) {
4747 if (atid->isfiltered)
4748 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4749 "%s: isfiltered=1, normal_comp?\n",
4752 ath_tx_comp_cleanup_aggr(sc, bf_first);
4757 * If the frame is filtered, transition to filtered frame
4758 * mode and add this to the filtered frame list.
4760 * XXX TODO: figure out how this interoperates with
4761 * BAR, pause and cleanup states.
4763 if ((ts.ts_status & HAL_TXERR_FILT) ||
4764 (ts.ts_status != 0 && atid->isfiltered)) {
4766 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4767 "%s: isfiltered=1, fail=%d\n", __func__, fail);
4768 ath_tx_tid_filt_comp_aggr(sc, atid, bf_first, &bf_cq);
4770 /* Remove from BAW */
4771 TAILQ_FOREACH(bf, &bf_cq, bf_list) {
4772 if (bf->bf_state.bfs_addedbaw)
4774 if (bf->bf_state.bfs_dobaw) {
4775 ath_tx_update_baw(sc, an, atid, bf);
4776 if (!bf->bf_state.bfs_addedbaw)
4777 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4778 "%s: wasn't added: seqno %d\n",
4780 SEQNO(bf->bf_state.bfs_seqno));
4782 bf->bf_state.bfs_dobaw = 0;
4785 * If any intermediate frames in the BAW were dropped when
4786 * handling filtering things, send a BAR.
4789 ath_tx_tid_bar_suspend(sc, atid);
4792 * Finish up by sending a BAR if required and freeing
4793 * the frames outside of the TX lock.
4795 goto finish_send_bar;
4799 * XXX for now, use the first frame in the aggregate for
4800 * XXX rate control completion; it's at least consistent.
4802 pktlen = bf_first->bf_state.bfs_pktlen;
4805 * Handle errors first!
4807 * Here, handle _any_ error as a "exceeded retries" error.
4808 * Later on (when filtered frames are to be specially handled)
4809 * it'll have to be expanded.
4812 if (ts.ts_status & HAL_TXERR_XRETRY) {
4814 if (ts.ts_status != 0) {
4816 ath_tx_comp_aggr_error(sc, bf_first, atid);
4820 tap = ath_tx_get_tx_tid(an, tid);
4823 * extract starting sequence and block-ack bitmap
4825 /* XXX endian-ness of seq_st, ba? */
4826 seq_st = ts.ts_seqnum;
4827 hasba = !! (ts.ts_flags & HAL_TX_BA);
4828 tx_ok = (ts.ts_status == 0);
4829 isaggr = bf_first->bf_state.bfs_aggr;
4830 ba[0] = ts.ts_ba_low;
4831 ba[1] = ts.ts_ba_high;
4834 * Copy the TX completion status and the rate control
4835 * series from the first descriptor, as it may be freed
4836 * before the rate control code can get its grubby fingers
4839 memcpy(rc, bf_first->bf_state.bfs_rc, sizeof(rc));
4841 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4842 "%s: txa_start=%d, tx_ok=%d, status=%.8x, flags=%.8x, "
4843 "isaggr=%d, seq_st=%d, hasba=%d, ba=%.8x, %.8x\n",
4844 __func__, tap->txa_start, tx_ok, ts.ts_status, ts.ts_flags,
4845 isaggr, seq_st, hasba, ba[0], ba[1]);
4848 * The reference driver doesn't do this; it simply ignores
4849 * this check in its entirety.
4851 * I've seen this occur when using iperf to send traffic
4852 * out tid 1 - the aggregate frames are all marked as TID 1,
4853 * but the TXSTATUS has TID=0. So, let's just ignore this
4857 /* Occasionally, the MAC sends a tx status for the wrong TID. */
4858 if (tid != ts.ts_tid) {
4859 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR, "%s: tid %d != hw tid %d\n",
4860 __func__, tid, ts.ts_tid);
4865 /* AR5416 BA bug; this requires an interface reset */
4866 if (isaggr && tx_ok && (! hasba)) {
4867 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4868 "%s: AR5416 bug: hasba=%d; txok=%d, isaggr=%d, "
4870 __func__, hasba, tx_ok, isaggr, seq_st);
4871 /* XXX TODO: schedule an interface reset */
4873 ath_printtxbuf(sc, bf_first,
4874 sc->sc_ac2q[atid->ac]->axq_qnum, 0, 0);
4879 * Walk the list of frames, figure out which ones were correctly
4880 * sent and which weren't.
4883 nf = bf_first->bf_state.bfs_nframes;
4885 /* bf_first is going to be invalid once this list is walked */
4889 * Walk the list of completed frames and determine
4890 * which need to be completed and which need to be
4893 * For completed frames, the completion functions need
4894 * to be called at the end of this function as the last
4895 * node reference may free the node.
4897 * Finally, since the TXQ lock can't be held during the
4898 * completion callback (to avoid lock recursion),
4899 * the completion calls have to be done outside of the
4904 ba_index = ATH_BA_INDEX(seq_st,
4905 SEQNO(bf->bf_state.bfs_seqno));
4906 bf_next = bf->bf_next;
4907 bf->bf_next = NULL; /* Remove it from the aggr list */
4909 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4910 "%s: checking bf=%p seqno=%d; ack=%d\n",
4911 __func__, bf, SEQNO(bf->bf_state.bfs_seqno),
4912 ATH_BA_ISSET(ba, ba_index));
4914 if (tx_ok && ATH_BA_ISSET(ba, ba_index)) {
4915 sc->sc_stats.ast_tx_aggr_ok++;
4916 ath_tx_update_baw(sc, an, atid, bf);
4917 bf->bf_state.bfs_dobaw = 0;
4918 if (!bf->bf_state.bfs_addedbaw)
4919 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4920 "%s: wasn't added: seqno %d\n",
4921 __func__, SEQNO(bf->bf_state.bfs_seqno));
4923 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4925 sc->sc_stats.ast_tx_aggr_fail++;
4926 if (ath_tx_retry_subframe(sc, bf, &bf_q)) {
4929 TAILQ_INSERT_TAIL(&bf_cq, bf, bf_list);
4937 * Now that the BAW updates have been done, unlock
4939 * txseq is grabbed before the lock is released so we
4940 * have a consistent view of what -was- in the BAW.
4941 * Anything after this point will not yet have been
4944 txseq = tap->txa_start;
4948 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4949 "%s: num frames seen=%d; bf nframes=%d\n",
4950 __func__, nframes, nf);
4953 * Now we know how many frames were bad, call the rate
4957 ath_tx_update_ratectrl(sc, ni, rc, &ts, pktlen, nframes,
4961 * send bar if we dropped any frames
4964 /* Suspend the TX queue and get ready to send the BAR */
4966 ath_tx_tid_bar_suspend(sc, atid);
4970 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
4971 "%s: txa_start now %d\n", __func__, tap->txa_start);
4975 /* Prepend all frames to the beginning of the queue */
4976 while ((bf = TAILQ_LAST(&bf_q, ath_bufhead_s)) != NULL) {
4977 TAILQ_REMOVE(&bf_q, bf, bf_list);
4978 ATH_TID_INSERT_HEAD(atid, bf, bf_list);
4982 * Reschedule to grab some further frames.
4984 ath_tx_tid_sched(sc, atid);
4987 * If the queue is filtered, re-schedule as required.
4989 * This is required as there may be a subsequent TX descriptor
4990 * for this end-node that has CLRDMASK set, so it's quite possible
4991 * that a filtered frame will be followed by a non-filtered
4992 * (complete or otherwise) frame.
4994 * XXX should we do this before we complete the frame?
4996 if (atid->isfiltered)
4997 ath_tx_tid_filt_comp_complete(sc, atid);
5002 * Send BAR if required
5004 if (ath_tx_tid_bar_tx_ready(sc, atid))
5005 ath_tx_tid_bar_tx(sc, atid);
5009 /* Do deferred completion */
5010 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5011 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5012 ath_tx_default_comp(sc, bf, 0);
5017 * Handle completion of unaggregated frames in an ADDBA
5020 * Fail is set to 1 if the entry is being freed via a call to
5021 * ath_tx_draintxq().
5024 ath_tx_aggr_comp_unaggr(struct ath_softc *sc, struct ath_buf *bf, int fail)
5026 struct ieee80211_node *ni = bf->bf_node;
5027 struct ath_node *an = ATH_NODE(ni);
5028 int tid = bf->bf_state.bfs_tid;
5029 struct ath_tid *atid = &an->an_tid[tid];
5030 struct ath_tx_status ts;
5034 * Take a copy of this; filtering/cloning the frame may free the
5037 ts = bf->bf_status.ds_txstat;
5040 * Update rate control status here, before we possibly
5041 * punt to retry or cleanup.
5043 * Do it outside of the TXQ lock.
5045 if (fail == 0 && ((bf->bf_state.bfs_txflags & HAL_TXDESC_NOACK) == 0))
5046 ath_tx_update_ratectrl(sc, ni, bf->bf_state.bfs_rc,
5047 &bf->bf_status.ds_txstat,
5048 bf->bf_state.bfs_pktlen,
5049 1, (ts.ts_status == 0) ? 0 : 1);
5052 * This is called early so atid->hwq_depth can be tracked.
5053 * This unfortunately means that it's released and regrabbed
5054 * during retry and cleanup. That's rather inefficient.
5058 if (tid == IEEE80211_NONQOS_TID)
5059 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16!\n", __func__);
5061 DPRINTF(sc, ATH_DEBUG_SW_TX,
5062 "%s: bf=%p: tid=%d, hwq_depth=%d, seqno=%d\n",
5063 __func__, bf, bf->bf_state.bfs_tid, atid->hwq_depth,
5064 SEQNO(bf->bf_state.bfs_seqno));
5067 if (atid->hwq_depth < 0)
5068 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: hwq_depth < 0: %d\n",
5069 __func__, atid->hwq_depth);
5072 * If the TID is filtered, handle completing the filter
5073 * transition before potentially kicking it to the cleanup
5076 if (atid->isfiltered)
5077 ath_tx_tid_filt_comp_complete(sc, atid);
5080 * If a cleanup is in progress, punt to comp_cleanup;
5081 * rather than handling it here. It's thus their
5082 * responsibility to clean up, call the completion
5083 * function in net80211, etc.
5085 if (atid->cleanup_inprogress) {
5086 if (atid->isfiltered)
5087 DPRINTF(sc, ATH_DEBUG_SW_TX,
5088 "%s: isfiltered=1, normal_comp?\n",
5091 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: cleanup_unaggr\n",
5093 ath_tx_comp_cleanup_unaggr(sc, bf);
5098 * XXX TODO: how does cleanup, BAR and filtered frame handling
5101 * If the frame is filtered OR if it's any failure but
5102 * the TID is filtered, the frame must be added to the
5103 * filtered frame list.
5105 * However - a busy buffer can't be added to the filtered
5106 * list as it will end up being recycled without having
5107 * been made available for the hardware.
5109 if ((ts.ts_status & HAL_TXERR_FILT) ||
5110 (ts.ts_status != 0 && atid->isfiltered)) {
5114 DPRINTF(sc, ATH_DEBUG_SW_TX,
5115 "%s: isfiltered=1, fail=%d\n",
5117 freeframe = ath_tx_tid_filt_comp_single(sc, atid, bf);
5119 * If freeframe=0 then bf is no longer ours; don't
5123 /* Remove from BAW */
5124 if (bf->bf_state.bfs_addedbaw)
5126 if (bf->bf_state.bfs_dobaw) {
5127 ath_tx_update_baw(sc, an, atid, bf);
5128 if (!bf->bf_state.bfs_addedbaw)
5129 DPRINTF(sc, ATH_DEBUG_SW_TX,
5130 "%s: wasn't added: seqno %d\n",
5131 __func__, SEQNO(bf->bf_state.bfs_seqno));
5133 bf->bf_state.bfs_dobaw = 0;
5137 * If the frame couldn't be filtered, treat it as a drop and
5138 * prepare to send a BAR.
5140 if (freeframe && drops)
5141 ath_tx_tid_bar_suspend(sc, atid);
5144 * Send BAR if required
5146 if (ath_tx_tid_bar_tx_ready(sc, atid))
5147 ath_tx_tid_bar_tx(sc, atid);
5151 * If freeframe is set, then the frame couldn't be
5152 * cloned and bf is still valid. Just complete/free it.
5155 ath_tx_default_comp(sc, bf, fail);
5160 * Don't bother with the retry check if all frames
5161 * are being failed (eg during queue deletion.)
5164 if (fail == 0 && ts->ts_status & HAL_TXERR_XRETRY) {
5166 if (fail == 0 && ts.ts_status != 0) {
5168 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: retry_unaggr\n",
5170 ath_tx_aggr_retry_unaggr(sc, bf);
5174 /* Success? Complete */
5175 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=%d, seqno %d\n",
5176 __func__, tid, SEQNO(bf->bf_state.bfs_seqno));
5177 if (bf->bf_state.bfs_dobaw) {
5178 ath_tx_update_baw(sc, an, atid, bf);
5179 bf->bf_state.bfs_dobaw = 0;
5180 if (!bf->bf_state.bfs_addedbaw)
5181 DPRINTF(sc, ATH_DEBUG_SW_TX,
5182 "%s: wasn't added: seqno %d\n",
5183 __func__, SEQNO(bf->bf_state.bfs_seqno));
5187 * If the queue is filtered, re-schedule as required.
5189 * This is required as there may be a subsequent TX descriptor
5190 * for this end-node that has CLRDMASK set, so it's quite possible
5191 * that a filtered frame will be followed by a non-filtered
5192 * (complete or otherwise) frame.
5194 * XXX should we do this before we complete the frame?
5196 if (atid->isfiltered)
5197 ath_tx_tid_filt_comp_complete(sc, atid);
5200 * Send BAR if required
5202 if (ath_tx_tid_bar_tx_ready(sc, atid))
5203 ath_tx_tid_bar_tx(sc, atid);
5207 ath_tx_default_comp(sc, bf, fail);
5208 /* bf is freed at this point */
5212 ath_tx_aggr_comp(struct ath_softc *sc, struct ath_buf *bf, int fail)
5214 if (bf->bf_state.bfs_aggr)
5215 ath_tx_aggr_comp_aggr(sc, bf, fail);
5217 ath_tx_aggr_comp_unaggr(sc, bf, fail);
5221 * Schedule some packets from the given node/TID to the hardware.
5223 * This is the aggregate version.
5226 ath_tx_tid_hw_queue_aggr(struct ath_softc *sc, struct ath_node *an,
5227 struct ath_tid *tid)
5230 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5231 struct ieee80211_tx_ampdu *tap;
5232 ATH_AGGR_STATUS status;
5235 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d\n", __func__, tid->tid);
5236 ATH_TX_LOCK_ASSERT(sc);
5239 * XXX TODO: If we're called for a queue that we're leaking frames to,
5240 * ensure we only leak one.
5243 tap = ath_tx_get_tx_tid(an, tid->tid);
5245 if (tid->tid == IEEE80211_NONQOS_TID)
5246 DPRINTF(sc, ATH_DEBUG_SW_TX,
5247 "%s: called for TID=NONQOS_TID?\n", __func__);
5250 status = ATH_AGGR_DONE;
5253 * If the upper layer has paused the TID, don't
5254 * queue any further packets.
5256 * This can also occur from the completion task because
5257 * of packet loss; but as its serialised with this code,
5258 * it won't "appear" half way through queuing packets.
5260 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5263 bf = ATH_TID_FIRST(tid);
5269 * If the packet doesn't fall within the BAW (eg a NULL
5270 * data frame), schedule it directly; continue.
5272 if (! bf->bf_state.bfs_dobaw) {
5273 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5274 "%s: non-baw packet\n",
5276 ATH_TID_REMOVE(tid, bf, bf_list);
5278 if (bf->bf_state.bfs_nframes > 1)
5279 DPRINTF(sc, ATH_DEBUG_SW_TX,
5280 "%s: aggr=%d, nframes=%d\n",
5282 bf->bf_state.bfs_aggr,
5283 bf->bf_state.bfs_nframes);
5286 * This shouldn't happen - such frames shouldn't
5287 * ever have been queued as an aggregate in the
5288 * first place. However, make sure the fields
5289 * are correctly setup just to be totally sure.
5291 bf->bf_state.bfs_aggr = 0;
5292 bf->bf_state.bfs_nframes = 1;
5294 /* Update CLRDMASK just before this frame is queued */
5295 ath_tx_update_clrdmask(sc, tid, bf);
5297 ath_tx_do_ratelookup(sc, bf);
5298 ath_tx_calc_duration(sc, bf);
5299 ath_tx_calc_protection(sc, bf);
5300 ath_tx_set_rtscts(sc, bf);
5301 ath_tx_rate_fill_rcflags(sc, bf);
5302 ath_tx_setds(sc, bf);
5303 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5305 sc->sc_aggr_stats.aggr_nonbaw_pkt++;
5307 /* Queue the packet; continue */
5314 * Do a rate control lookup on the first frame in the
5315 * list. The rate control code needs that to occur
5316 * before it can determine whether to TX.
5317 * It's inaccurate because the rate control code doesn't
5318 * really "do" aggregate lookups, so it only considers
5319 * the size of the first frame.
5321 ath_tx_do_ratelookup(sc, bf);
5322 bf->bf_state.bfs_rc[3].rix = 0;
5323 bf->bf_state.bfs_rc[3].tries = 0;
5325 ath_tx_calc_duration(sc, bf);
5326 ath_tx_calc_protection(sc, bf);
5328 ath_tx_set_rtscts(sc, bf);
5329 ath_tx_rate_fill_rcflags(sc, bf);
5331 status = ath_tx_form_aggr(sc, an, tid, &bf_q);
5333 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5334 "%s: ath_tx_form_aggr() status=%d\n", __func__, status);
5337 * No frames to be picked up - out of BAW
5339 if (TAILQ_EMPTY(&bf_q))
5343 * This assumes that the descriptor list in the ath_bufhead
5344 * are already linked together via bf_next pointers.
5346 bf = TAILQ_FIRST(&bf_q);
5348 if (status == ATH_AGGR_8K_LIMITED)
5349 sc->sc_aggr_stats.aggr_rts_aggr_limited++;
5352 * If it's the only frame send as non-aggregate
5353 * assume that ath_tx_form_aggr() has checked
5354 * whether it's in the BAW and added it appropriately.
5356 if (bf->bf_state.bfs_nframes == 1) {
5357 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5358 "%s: single-frame aggregate\n", __func__);
5360 /* Update CLRDMASK just before this frame is queued */
5361 ath_tx_update_clrdmask(sc, tid, bf);
5363 bf->bf_state.bfs_aggr = 0;
5364 bf->bf_state.bfs_ndelim = 0;
5365 ath_tx_setds(sc, bf);
5366 ath_hal_clr11n_aggr(sc->sc_ah, bf->bf_desc);
5367 if (status == ATH_AGGR_BAW_CLOSED)
5368 sc->sc_aggr_stats.aggr_baw_closed_single_pkt++;
5370 sc->sc_aggr_stats.aggr_single_pkt++;
5372 DPRINTF(sc, ATH_DEBUG_SW_TX_AGGR,
5373 "%s: multi-frame aggregate: %d frames, "
5375 __func__, bf->bf_state.bfs_nframes,
5376 bf->bf_state.bfs_al);
5377 bf->bf_state.bfs_aggr = 1;
5378 sc->sc_aggr_stats.aggr_pkts[bf->bf_state.bfs_nframes]++;
5379 sc->sc_aggr_stats.aggr_aggr_pkt++;
5381 /* Update CLRDMASK just before this frame is queued */
5382 ath_tx_update_clrdmask(sc, tid, bf);
5385 * Calculate the duration/protection as required.
5387 ath_tx_calc_duration(sc, bf);
5388 ath_tx_calc_protection(sc, bf);
5391 * Update the rate and rtscts information based on the
5392 * rate decision made by the rate control code;
5393 * the first frame in the aggregate needs it.
5395 ath_tx_set_rtscts(sc, bf);
5398 * Setup the relevant descriptor fields
5399 * for aggregation. The first descriptor
5400 * already points to the rest in the chain.
5402 ath_tx_setds_11n(sc, bf);
5406 /* Set completion handler, multi-frame aggregate or not */
5407 bf->bf_comp = ath_tx_aggr_comp;
5409 if (bf->bf_state.bfs_tid == IEEE80211_NONQOS_TID)
5410 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: TID=16?\n", __func__);
5413 * Update leak count and frame config if were leaking frames.
5415 * XXX TODO: it should update all frames in an aggregate
5418 ath_tx_leak_count_update(sc, tid, bf);
5421 ath_tx_handoff(sc, txq, bf);
5423 /* Track outstanding buffer count to hardware */
5424 /* aggregates are "one" buffer */
5428 * Break out if ath_tx_form_aggr() indicated
5429 * there can't be any further progress (eg BAW is full.)
5430 * Checking for an empty txq is done above.
5432 * XXX locking on txq here?
5434 /* XXX TXQ locking */
5435 if (txq->axq_aggr_depth >= sc->sc_hwq_limit_aggr ||
5436 (status == ATH_AGGR_BAW_CLOSED ||
5437 status == ATH_AGGR_LEAK_CLOSED))
5443 * Schedule some packets from the given node/TID to the hardware.
5445 * XXX TODO: this routine doesn't enforce the maximum TXQ depth.
5446 * It just dumps frames into the TXQ. We should limit how deep
5447 * the transmit queue can grow for frames dispatched to the given
5450 * To avoid locking issues, either we need to own the TXQ lock
5451 * at this point, or we need to pass in the maximum frame count
5455 ath_tx_tid_hw_queue_norm(struct ath_softc *sc, struct ath_node *an,
5456 struct ath_tid *tid)
5459 struct ath_txq *txq = sc->sc_ac2q[tid->ac];
5461 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: node %p: TID %d: called\n",
5462 __func__, an, tid->tid);
5464 ATH_TX_LOCK_ASSERT(sc);
5466 /* Check - is AMPDU pending or running? then print out something */
5467 if (ath_tx_ampdu_pending(sc, an, tid->tid))
5468 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu pending?\n",
5469 __func__, tid->tid);
5470 if (ath_tx_ampdu_running(sc, an, tid->tid))
5471 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, ampdu running?\n",
5472 __func__, tid->tid);
5477 * If the upper layers have paused the TID, don't
5478 * queue any further packets.
5480 * XXX if we are leaking frames, make sure we decrement
5481 * that counter _and_ we continue here.
5483 if (! ath_tx_tid_can_tx_or_sched(sc, tid))
5486 bf = ATH_TID_FIRST(tid);
5491 ATH_TID_REMOVE(tid, bf, bf_list);
5494 if (tid->tid != bf->bf_state.bfs_tid) {
5495 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: bfs_tid %d !="
5496 " tid %d\n", __func__, bf->bf_state.bfs_tid,
5499 /* Normal completion handler */
5500 bf->bf_comp = ath_tx_normal_comp;
5503 * Override this for now, until the non-aggregate
5504 * completion handler correctly handles software retransmits.
5506 bf->bf_state.bfs_txflags |= HAL_TXDESC_CLRDMASK;
5508 /* Update CLRDMASK just before this frame is queued */
5509 ath_tx_update_clrdmask(sc, tid, bf);
5511 /* Program descriptors + rate control */
5512 ath_tx_do_ratelookup(sc, bf);
5513 ath_tx_calc_duration(sc, bf);
5514 ath_tx_calc_protection(sc, bf);
5515 ath_tx_set_rtscts(sc, bf);
5516 ath_tx_rate_fill_rcflags(sc, bf);
5517 ath_tx_setds(sc, bf);
5520 * Update the current leak count if
5521 * we're leaking frames; and set the
5522 * MORE flag as appropriate.
5524 ath_tx_leak_count_update(sc, tid, bf);
5526 /* Track outstanding buffer count to hardware */
5527 /* aggregates are "one" buffer */
5530 /* Punt to hardware or software txq */
5531 ath_tx_handoff(sc, txq, bf);
5536 * Schedule some packets to the given hardware queue.
5538 * This function walks the list of TIDs (ie, ath_node TIDs
5539 * with queued traffic) and attempts to schedule traffic
5542 * TID scheduling is implemented as a FIFO, with TIDs being
5543 * added to the end of the queue after some frames have been
5547 ath_txq_sched(struct ath_softc *sc, struct ath_txq *txq)
5549 struct ath_tid *tid, *last;
5551 ATH_TX_LOCK_ASSERT(sc);
5554 * Don't schedule if the hardware queue is busy.
5555 * This (hopefully) gives some more time to aggregate
5556 * some packets in the aggregation queue.
5558 * XXX It doesn't stop a parallel sender from sneaking
5559 * in transmitting a frame!
5561 /* XXX TXQ locking */
5562 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5563 sc->sc_aggr_stats.aggr_sched_nopkt++;
5566 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5567 sc->sc_aggr_stats.aggr_sched_nopkt++;
5571 last = TAILQ_LAST(&txq->axq_tidq, axq_t_s);
5573 while ((tid = TAILQ_FIRST(&txq->axq_tidq)) != NULL) {
5575 * Suspend paused queues here; they'll be resumed
5576 * once the addba completes or times out.
5578 DPRINTF(sc, ATH_DEBUG_SW_TX, "%s: tid=%d, paused=%d\n",
5579 __func__, tid->tid, tid->paused);
5580 ath_tx_tid_unsched(sc, tid);
5582 * This node may be in power-save and we're leaking
5583 * a frame; be careful.
5585 if (! ath_tx_tid_can_tx_or_sched(sc, tid)) {
5590 if (ath_tx_ampdu_running(sc, tid->an, tid->tid))
5591 ath_tx_tid_hw_queue_aggr(sc, tid->an, tid);
5593 ath_tx_tid_hw_queue_norm(sc, tid->an, tid);
5595 /* Not empty? Re-schedule */
5596 if (tid->axq_depth != 0)
5597 ath_tx_tid_sched(sc, tid);
5600 * Give the software queue time to aggregate more
5601 * packets. If we aren't running aggregation then
5602 * we should still limit the hardware queue depth.
5604 /* XXX TXQ locking */
5605 if (txq->axq_aggr_depth + txq->fifo.axq_depth >= sc->sc_hwq_limit_aggr) {
5608 if (txq->axq_depth >= sc->sc_hwq_limit_nonaggr) {
5613 * If this was the last entry on the original list, stop.
5614 * Otherwise nodes that have been rescheduled onto the end
5615 * of the TID FIFO list will just keep being rescheduled.
5617 * XXX What should we do about nodes that were paused
5618 * but are pending a leaking frame in response to a ps-poll?
5619 * They'll be put at the front of the list; so they'll
5620 * prematurely trigger this condition! Ew.
5632 * Return net80211 TID struct pointer, or NULL for none
5634 struct ieee80211_tx_ampdu *
5635 ath_tx_get_tx_tid(struct ath_node *an, int tid)
5637 struct ieee80211_node *ni = &an->an_node;
5638 struct ieee80211_tx_ampdu *tap;
5640 if (tid == IEEE80211_NONQOS_TID)
5643 tap = &ni->ni_tx_ampdu[tid];
5648 * Is AMPDU-TX running?
5651 ath_tx_ampdu_running(struct ath_softc *sc, struct ath_node *an, int tid)
5653 struct ieee80211_tx_ampdu *tap;
5655 if (tid == IEEE80211_NONQOS_TID)
5658 tap = ath_tx_get_tx_tid(an, tid);
5660 return 0; /* Not valid; default to not running */
5662 return !! (tap->txa_flags & IEEE80211_AGGR_RUNNING);
5666 * Is AMPDU-TX negotiation pending?
5669 ath_tx_ampdu_pending(struct ath_softc *sc, struct ath_node *an, int tid)
5671 struct ieee80211_tx_ampdu *tap;
5673 if (tid == IEEE80211_NONQOS_TID)
5676 tap = ath_tx_get_tx_tid(an, tid);
5678 return 0; /* Not valid; default to not pending */
5680 return !! (tap->txa_flags & IEEE80211_AGGR_XCHGPEND);
5684 * Is AMPDU-TX pending for the given TID?
5689 * Method to handle sending an ADDBA request.
5691 * We tap this so the relevant flags can be set to pause the TID
5692 * whilst waiting for the response.
5694 * XXX there's no timeout handler we can override?
5697 ath_addba_request(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5698 int dialogtoken, int baparamset, int batimeout)
5700 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5701 int tid = tap->txa_tid;
5702 struct ath_node *an = ATH_NODE(ni);
5703 struct ath_tid *atid = &an->an_tid[tid];
5706 * XXX danger Will Robinson!
5708 * Although the taskqueue may be running and scheduling some more
5709 * packets, these should all be _before_ the addba sequence number.
5710 * However, net80211 will keep self-assigning sequence numbers
5711 * until addba has been negotiated.
5713 * In the past, these packets would be "paused" (which still works
5714 * fine, as they're being scheduled to the driver in the same
5715 * serialised method which is calling the addba request routine)
5716 * and when the aggregation session begins, they'll be dequeued
5717 * as aggregate packets and added to the BAW. However, now there's
5718 * a "bf->bf_state.bfs_dobaw" flag, and this isn't set for these
5719 * packets. Thus they never get included in the BAW tracking and
5720 * this can cause the initial burst of packets after the addba
5721 * negotiation to "hang", as they quickly fall outside the BAW.
5723 * The "eventual" solution should be to tag these packets with
5724 * dobaw. Although net80211 has given us a sequence number,
5725 * it'll be "after" the left edge of the BAW and thus it'll
5730 * This is a bit annoying. Until net80211 HT code inherits some
5731 * (any) locking, we may have this called in parallel BUT only
5732 * one response/timeout will be called. Grr.
5734 if (atid->addba_tx_pending == 0) {
5735 ath_tx_tid_pause(sc, atid);
5736 atid->addba_tx_pending = 1;
5740 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5741 "%s: %s: called; dialogtoken=%d, baparamset=%d, batimeout=%d\n",
5743 ath_hal_ether_sprintf(ni->ni_macaddr),
5744 dialogtoken, baparamset, batimeout);
5745 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5746 "%s: txa_start=%d, ni_txseqs=%d\n",
5747 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5749 return sc->sc_addba_request(ni, tap, dialogtoken, baparamset,
5754 * Handle an ADDBA response.
5756 * We unpause the queue so TX'ing can resume.
5758 * Any packets TX'ed from this point should be "aggregate" (whether
5759 * aggregate or not) so the BAW is updated.
5761 * Note! net80211 keeps self-assigning sequence numbers until
5762 * ampdu is negotiated. This means the initially-negotiated BAW left
5763 * edge won't match the ni->ni_txseq.
5765 * So, being very dirty, the BAW left edge is "slid" here to match
5768 * What likely SHOULD happen is that all packets subsequent to the
5769 * addba request should be tagged as aggregate and queued as non-aggregate
5770 * frames; thus updating the BAW. For now though, I'll just slide the
5774 ath_addba_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5775 int status, int code, int batimeout)
5777 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5778 int tid = tap->txa_tid;
5779 struct ath_node *an = ATH_NODE(ni);
5780 struct ath_tid *atid = &an->an_tid[tid];
5783 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5784 "%s: %s: called; status=%d, code=%d, batimeout=%d\n", __func__,
5785 ath_hal_ether_sprintf(ni->ni_macaddr),
5786 status, code, batimeout);
5788 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
5789 "%s: txa_start=%d, ni_txseqs=%d\n",
5790 __func__, tap->txa_start, ni->ni_txseqs[tid]);
5793 * Call this first, so the interface flags get updated
5794 * before the TID is unpaused. Otherwise a race condition
5795 * exists where the unpaused TID still doesn't yet have
5796 * IEEE80211_AGGR_RUNNING set.
5798 r = sc->sc_addba_response(ni, tap, status, code, batimeout);
5801 atid->addba_tx_pending = 0;
5804 * Slide the BAW left edge to wherever net80211 left it for us.
5805 * Read above for more information.
5807 tap->txa_start = ni->ni_txseqs[tid];
5808 ath_tx_tid_resume(sc, atid);
5815 * Stop ADDBA on a queue.
5817 * This can be called whilst BAR TX is currently active on the queue,
5818 * so make sure this is unblocked before continuing.
5821 ath_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
5823 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5824 int tid = tap->txa_tid;
5825 struct ath_node *an = ATH_NODE(ni);
5826 struct ath_tid *atid = &an->an_tid[tid];
5830 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL, "%s: %s: called\n",
5832 ath_hal_ether_sprintf(ni->ni_macaddr));
5835 * Pause TID traffic early, so there aren't any races
5836 * Unblock the pending BAR held traffic, if it's currently paused.
5839 ath_tx_tid_pause(sc, atid);
5840 if (atid->bar_wait) {
5842 * bar_unsuspend() expects bar_tx == 1, as it should be
5843 * called from the TX completion path. This quietens
5844 * the warning. It's cleared for us anyway.
5847 ath_tx_tid_bar_unsuspend(sc, atid);
5851 /* There's no need to hold the TXQ lock here */
5852 sc->sc_addba_stop(ni, tap);
5855 * ath_tx_tid_cleanup will resume the TID if possible, otherwise
5856 * it'll set the cleanup flag, and it'll be unpaused once
5857 * things have been cleaned up.
5863 * In case there's a followup call to this, only call it
5864 * if we don't have a cleanup in progress.
5866 * Since we've paused the queue above, we need to make
5867 * sure we unpause if there's already a cleanup in
5868 * progress - it means something else is also doing
5869 * this stuff, so we don't need to also keep it paused.
5871 if (atid->cleanup_inprogress) {
5872 ath_tx_tid_resume(sc, atid);
5874 ath_tx_tid_cleanup(sc, an, tid, &bf_cq);
5876 * Unpause the TID if no cleanup is required.
5878 if (! atid->cleanup_inprogress)
5879 ath_tx_tid_resume(sc, atid);
5883 /* Handle completing frames and fail them */
5884 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5885 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5886 ath_tx_default_comp(sc, bf, 1);
5892 * Handle a node reassociation.
5894 * We may have a bunch of frames queued to the hardware; those need
5895 * to be marked as cleanup.
5898 ath_tx_node_reassoc(struct ath_softc *sc, struct ath_node *an)
5900 struct ath_tid *tid;
5907 ATH_TX_UNLOCK_ASSERT(sc);
5910 for (i = 0; i < IEEE80211_TID_SIZE; i++) {
5911 tid = &an->an_tid[i];
5912 if (tid->hwq_depth == 0)
5914 DPRINTF(sc, ATH_DEBUG_NODE,
5915 "%s: %s: TID %d: cleaning up TID\n",
5917 ath_hal_ether_sprintf(an->an_node.ni_macaddr),
5920 * In case there's a followup call to this, only call it
5921 * if we don't have a cleanup in progress.
5923 if (! tid->cleanup_inprogress) {
5924 ath_tx_tid_pause(sc, tid);
5925 ath_tx_tid_cleanup(sc, an, i, &bf_cq);
5927 * Unpause the TID if no cleanup is required.
5929 if (! tid->cleanup_inprogress)
5930 ath_tx_tid_resume(sc, tid);
5935 /* Handle completing frames and fail them */
5936 while ((bf = TAILQ_FIRST(&bf_cq)) != NULL) {
5937 TAILQ_REMOVE(&bf_cq, bf, bf_list);
5938 ath_tx_default_comp(sc, bf, 1);
5943 * Note: net80211 bar_timeout() doesn't call this function on BAR failure;
5944 * it simply tears down the aggregation session. Ew.
5946 * It however will call ieee80211_ampdu_stop() which will call
5947 * ic->ic_addba_stop().
5949 * XXX This uses a hard-coded max BAR count value; the whole
5950 * XXX BAR TX success or failure should be better handled!
5953 ath_bar_response(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap,
5956 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
5957 int tid = tap->txa_tid;
5958 struct ath_node *an = ATH_NODE(ni);
5959 struct ath_tid *atid = &an->an_tid[tid];
5960 int attempts = tap->txa_attempts;
5963 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
5964 "%s: %s: called; txa_tid=%d, atid->tid=%d, status=%d, attempts=%d"
5965 ", txa_start=%d, txa_seqpending=%d\n",
5967 ath_hal_ether_sprintf(ni->ni_macaddr),
5973 tap->txa_seqpending);
5975 /* Note: This may update the BAW details */
5977 * XXX What if this does slide the BAW along? We need to somehow
5978 * XXX either fix things when it does happen, or prevent the
5979 * XXX seqpending value to be anything other than exactly what
5980 * XXX the hell we want!
5982 * XXX So for now, how I do this inside the TX lock for now
5983 * XXX and just correct it afterwards? The below condition should
5984 * XXX never happen and if it does I need to fix all kinds of things.
5986 old_txa_start = tap->txa_start;
5987 sc->sc_bar_response(ni, tap, status);
5988 if (tap->txa_start != old_txa_start) {
5989 device_printf(sc->sc_dev,
5990 "%s: tid=%d; txa_start=%d, old=%d, adjusting\n",
5996 tap->txa_start = old_txa_start;
5998 /* Unpause the TID */
6000 * XXX if this is attempt=50, the TID will be downgraded
6001 * XXX to a non-aggregate session. So we must unpause the
6002 * XXX TID here or it'll never be done.
6004 * Also, don't call it if bar_tx/bar_wait are 0; something
6005 * has beaten us to the punch? (XXX figure out what?)
6007 if (status == 0 || attempts == 50) {
6009 if (atid->bar_tx == 0 || atid->bar_wait == 0)
6010 DPRINTF(sc, ATH_DEBUG_SW_TX_BAR,
6011 "%s: huh? bar_tx=%d, bar_wait=%d\n",
6013 atid->bar_tx, atid->bar_wait);
6015 ath_tx_tid_bar_unsuspend(sc, atid);
6021 * This is called whenever the pending ADDBA request times out.
6022 * Unpause and reschedule the TID.
6025 ath_addba_response_timeout(struct ieee80211_node *ni,
6026 struct ieee80211_tx_ampdu *tap)
6028 struct ath_softc *sc = ni->ni_ic->ic_ifp->if_softc;
6029 int tid = tap->txa_tid;
6030 struct ath_node *an = ATH_NODE(ni);
6031 struct ath_tid *atid = &an->an_tid[tid];
6033 DPRINTF(sc, ATH_DEBUG_SW_TX_CTRL,
6034 "%s: %s: TID=%d, called; resuming\n",
6036 ath_hal_ether_sprintf(ni->ni_macaddr),
6040 atid->addba_tx_pending = 0;
6043 /* Note: This updates the aggregate state to (again) pending */
6044 sc->sc_addba_response_timeout(ni, tap);
6046 /* Unpause the TID; which reschedules it */
6048 ath_tx_tid_resume(sc, atid);
6053 * Check if a node is asleep or not.
6056 ath_tx_node_is_asleep(struct ath_softc *sc, struct ath_node *an)
6059 ATH_TX_LOCK_ASSERT(sc);
6061 return (an->an_is_powersave);
6065 * Mark a node as currently "in powersaving."
6066 * This suspends all traffic on the node.
6068 * This must be called with the node/tx locks free.
6070 * XXX TODO: the locking silliness below is due to how the node
6071 * locking currently works. Right now, the node lock is grabbed
6072 * to do rate control lookups and these are done with the TX
6073 * queue lock held. This means the node lock can't be grabbed
6074 * first here or a LOR will occur.
6076 * Eventually (hopefully!) the TX path code will only grab
6077 * the TXQ lock when transmitting and the ath_node lock when
6078 * doing node/TID operations. There are other complications -
6079 * the sched/unsched operations involve walking the per-txq
6080 * 'active tid' list and this requires both locks to be held.
6083 ath_tx_node_sleep(struct ath_softc *sc, struct ath_node *an)
6085 struct ath_tid *atid;
6086 struct ath_txq *txq;
6089 ATH_TX_UNLOCK_ASSERT(sc);
6091 /* Suspend all traffic on the node */
6094 if (an->an_is_powersave) {
6095 DPRINTF(sc, ATH_DEBUG_XMIT,
6096 "%s: %s: node was already asleep!\n",
6097 __func__, ath_hal_ether_sprintf(an->an_node.ni_macaddr));
6102 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6103 atid = &an->an_tid[tid];
6104 txq = sc->sc_ac2q[atid->ac];
6106 ath_tx_tid_pause(sc, atid);
6109 /* Mark node as in powersaving */
6110 an->an_is_powersave = 1;
6116 * Mark a node as currently "awake."
6117 * This resumes all traffic to the node.
6120 ath_tx_node_wakeup(struct ath_softc *sc, struct ath_node *an)
6122 struct ath_tid *atid;
6123 struct ath_txq *txq;
6126 ATH_TX_UNLOCK_ASSERT(sc);
6131 if (an->an_is_powersave == 0) {
6133 DPRINTF(sc, ATH_DEBUG_XMIT,
6134 "%s: an=%p: node was already awake\n",
6139 /* Mark node as awake */
6140 an->an_is_powersave = 0;
6142 * Clear any pending leaked frame requests
6144 an->an_leak_count = 0;
6146 for (tid = 0; tid < IEEE80211_TID_SIZE; tid++) {
6147 atid = &an->an_tid[tid];
6148 txq = sc->sc_ac2q[atid->ac];
6150 ath_tx_tid_resume(sc, atid);
6156 ath_legacy_dma_txsetup(struct ath_softc *sc)
6159 /* nothing new needed */
6164 ath_legacy_dma_txteardown(struct ath_softc *sc)
6167 /* nothing new needed */
6172 ath_xmit_setup_legacy(struct ath_softc *sc)
6175 * For now, just set the descriptor length to sizeof(ath_desc);
6176 * worry about extracting the real length out of the HAL later.
6178 sc->sc_tx_desclen = sizeof(struct ath_desc);
6179 sc->sc_tx_statuslen = sizeof(struct ath_desc);
6180 sc->sc_tx_nmaps = 1; /* only one buffer per TX desc */
6182 sc->sc_tx.xmit_setup = ath_legacy_dma_txsetup;
6183 sc->sc_tx.xmit_teardown = ath_legacy_dma_txteardown;
6184 sc->sc_tx.xmit_attach_comp_func = ath_legacy_attach_comp_func;
6186 sc->sc_tx.xmit_dma_restart = ath_legacy_tx_dma_restart;
6187 sc->sc_tx.xmit_handoff = ath_legacy_xmit_handoff;
6189 sc->sc_tx.xmit_drain = ath_legacy_tx_drain;