2 * Copyright (c) 2008-2011 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 #include <linux/dma-mapping.h>
19 #include "ar9003_mac.h"
21 #define BITS_PER_BYTE 8
22 #define OFDM_PLCP_BITS 22
23 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
29 #define HT_LTF(_ns) (4 * (_ns))
30 #define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */
31 #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */
32 #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
33 #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
36 static u16 bits_per_symbol[][2] = {
38 { 26, 54 }, /* 0: BPSK */
39 { 52, 108 }, /* 1: QPSK 1/2 */
40 { 78, 162 }, /* 2: QPSK 3/4 */
41 { 104, 216 }, /* 3: 16-QAM 1/2 */
42 { 156, 324 }, /* 4: 16-QAM 3/4 */
43 { 208, 432 }, /* 5: 64-QAM 2/3 */
44 { 234, 486 }, /* 6: 64-QAM 3/4 */
45 { 260, 540 }, /* 7: 64-QAM 5/6 */
48 #define IS_HT_RATE(_rate) ((_rate) & 0x80)
50 static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
51 struct ath_atx_tid *tid, struct sk_buff *skb);
52 static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
53 int tx_flags, struct ath_txq *txq);
54 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
55 struct ath_txq *txq, struct list_head *bf_q,
56 struct ath_tx_status *ts, int txok, int sendbar);
57 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
58 struct list_head *head, bool internal);
59 static void ath_tx_rc_status(struct ath_softc *sc, struct ath_buf *bf,
60 struct ath_tx_status *ts, int nframes, int nbad,
61 int txok, bool update_rc);
62 static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
64 static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
66 struct ath_atx_tid *tid,
76 static int ath_max_4ms_framelen[4][32] = {
78 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172,
79 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280,
80 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532,
81 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532,
84 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744,
85 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532,
86 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532,
87 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532,
90 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532,
91 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532,
92 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532,
93 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532,
96 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532,
97 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532,
98 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532,
99 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532,
103 /*********************/
104 /* Aggregation logic */
105 /*********************/
107 static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
109 struct ath_atx_ac *ac = tid->ac;
118 list_add_tail(&tid->list, &ac->tid_q);
124 list_add_tail(&ac->list, &txq->axq_acq);
127 static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
129 struct ath_txq *txq = tid->ac->txq;
131 WARN_ON(!tid->paused);
133 spin_lock_bh(&txq->axq_lock);
136 if (skb_queue_empty(&tid->buf_q))
139 ath_tx_queue_tid(txq, tid);
140 ath_txq_schedule(sc, txq);
142 spin_unlock_bh(&txq->axq_lock);
145 static struct ath_frame_info *get_frame_info(struct sk_buff *skb)
147 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
148 BUILD_BUG_ON(sizeof(struct ath_frame_info) >
149 sizeof(tx_info->rate_driver_data));
150 return (struct ath_frame_info *) &tx_info->rate_driver_data[0];
153 static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
155 struct ath_txq *txq = tid->ac->txq;
158 struct list_head bf_head;
159 struct ath_tx_status ts;
160 struct ath_frame_info *fi;
162 INIT_LIST_HEAD(&bf_head);
164 memset(&ts, 0, sizeof(ts));
165 spin_lock_bh(&txq->axq_lock);
167 while ((skb = __skb_dequeue(&tid->buf_q))) {
168 fi = get_frame_info(skb);
171 spin_unlock_bh(&txq->axq_lock);
172 if (bf && fi->retries) {
173 list_add_tail(&bf->list, &bf_head);
174 ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
175 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 1);
177 ath_tx_send_normal(sc, txq, NULL, skb);
179 spin_lock_bh(&txq->axq_lock);
182 spin_unlock_bh(&txq->axq_lock);
185 static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
190 index = ATH_BA_INDEX(tid->seq_start, seqno);
191 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
193 __clear_bit(cindex, tid->tx_buf);
195 while (tid->baw_head != tid->baw_tail && !test_bit(tid->baw_head, tid->tx_buf)) {
196 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
197 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
201 static void ath_tx_addto_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
206 index = ATH_BA_INDEX(tid->seq_start, seqno);
207 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
208 __set_bit(cindex, tid->tx_buf);
210 if (index >= ((tid->baw_tail - tid->baw_head) &
211 (ATH_TID_MAX_BUFS - 1))) {
212 tid->baw_tail = cindex;
213 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
218 * TODO: For frame(s) that are in the retry state, we will reuse the
219 * sequence number(s) without setting the retry bit. The
220 * alternative is to give up on these and BAR the receiver's window
223 static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
224 struct ath_atx_tid *tid)
229 struct list_head bf_head;
230 struct ath_tx_status ts;
231 struct ath_frame_info *fi;
233 memset(&ts, 0, sizeof(ts));
234 INIT_LIST_HEAD(&bf_head);
236 while ((skb = __skb_dequeue(&tid->buf_q))) {
237 fi = get_frame_info(skb);
241 spin_unlock(&txq->axq_lock);
242 ath_tx_complete(sc, skb, ATH_TX_ERROR, txq);
243 spin_lock(&txq->axq_lock);
247 list_add_tail(&bf->list, &bf_head);
250 ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
252 spin_unlock(&txq->axq_lock);
253 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
254 spin_lock(&txq->axq_lock);
257 tid->seq_next = tid->seq_start;
258 tid->baw_tail = tid->baw_head;
261 static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
264 struct ath_frame_info *fi = get_frame_info(skb);
265 struct ieee80211_hdr *hdr;
267 TX_STAT_INC(txq->axq_qnum, a_retries);
268 if (fi->retries++ > 0)
271 hdr = (struct ieee80211_hdr *)skb->data;
272 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
275 static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
277 struct ath_buf *bf = NULL;
279 spin_lock_bh(&sc->tx.txbuflock);
281 if (unlikely(list_empty(&sc->tx.txbuf))) {
282 spin_unlock_bh(&sc->tx.txbuflock);
286 bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
289 spin_unlock_bh(&sc->tx.txbuflock);
294 static void ath_tx_return_buffer(struct ath_softc *sc, struct ath_buf *bf)
296 spin_lock_bh(&sc->tx.txbuflock);
297 list_add_tail(&bf->list, &sc->tx.txbuf);
298 spin_unlock_bh(&sc->tx.txbuflock);
301 static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
305 tbf = ath_tx_get_buffer(sc);
309 ATH_TXBUF_RESET(tbf);
311 tbf->bf_mpdu = bf->bf_mpdu;
312 tbf->bf_buf_addr = bf->bf_buf_addr;
313 memcpy(tbf->bf_desc, bf->bf_desc, sc->sc_ah->caps.tx_desc_len);
314 tbf->bf_state = bf->bf_state;
319 static void ath_tx_count_frames(struct ath_softc *sc, struct ath_buf *bf,
320 struct ath_tx_status *ts, int txok,
321 int *nframes, int *nbad)
323 struct ath_frame_info *fi;
325 u32 ba[WME_BA_BMP_SIZE >> 5];
332 isaggr = bf_isaggr(bf);
334 seq_st = ts->ts_seqnum;
335 memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
339 fi = get_frame_info(bf->bf_mpdu);
340 ba_index = ATH_BA_INDEX(seq_st, bf->bf_state.seqno);
343 if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
351 static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
352 struct ath_buf *bf, struct list_head *bf_q,
353 struct ath_tx_status *ts, int txok, bool retry)
355 struct ath_node *an = NULL;
357 struct ieee80211_sta *sta;
358 struct ieee80211_hw *hw = sc->hw;
359 struct ieee80211_hdr *hdr;
360 struct ieee80211_tx_info *tx_info;
361 struct ath_atx_tid *tid = NULL;
362 struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
363 struct list_head bf_head;
364 struct sk_buff_head bf_pending;
365 u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0;
366 u32 ba[WME_BA_BMP_SIZE >> 5];
367 int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
368 bool rc_update = true;
369 struct ieee80211_tx_rate rates[4];
370 struct ath_frame_info *fi;
376 hdr = (struct ieee80211_hdr *)skb->data;
378 tx_info = IEEE80211_SKB_CB(skb);
380 memcpy(rates, tx_info->control.rates, sizeof(rates));
384 sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
388 INIT_LIST_HEAD(&bf_head);
390 bf_next = bf->bf_next;
392 if (!bf->bf_stale || bf_next != NULL)
393 list_move_tail(&bf->list, &bf_head);
395 ath_tx_rc_status(sc, bf, ts, 1, 1, 0, false);
396 ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
404 an = (struct ath_node *)sta->drv_priv;
405 tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
406 tid = ATH_AN_2_TID(an, tidno);
409 * The hardware occasionally sends a tx status for the wrong TID.
410 * In this case, the BA status cannot be considered valid and all
411 * subframes need to be retransmitted
413 if (tidno != ts->tid)
416 isaggr = bf_isaggr(bf);
417 memset(ba, 0, WME_BA_BMP_SIZE >> 3);
419 if (isaggr && txok) {
420 if (ts->ts_flags & ATH9K_TX_BA) {
421 seq_st = ts->ts_seqnum;
422 memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
425 * AR5416 can become deaf/mute when BA
426 * issue happens. Chip needs to be reset.
427 * But AP code may have sychronization issues
428 * when perform internal reset in this routine.
429 * Only enable reset in STA mode for now.
431 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION)
436 __skb_queue_head_init(&bf_pending);
438 ath_tx_count_frames(sc, bf, ts, txok, &nframes, &nbad);
440 u16 seqno = bf->bf_state.seqno;
442 txfail = txpending = sendbar = 0;
443 bf_next = bf->bf_next;
446 tx_info = IEEE80211_SKB_CB(skb);
447 fi = get_frame_info(skb);
449 if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, seqno))) {
450 /* transmit completion, subframe is
451 * acked by block ack */
453 } else if (!isaggr && txok) {
454 /* transmit completion */
457 if ((tid->state & AGGR_CLEANUP) || !retry) {
459 * cleanup in progress, just fail
460 * the un-acked sub-frames
463 } else if (fi->retries < ATH_MAX_SW_RETRIES) {
464 if (!(ts->ts_status & ATH9K_TXERR_FILT) ||
466 ath_tx_set_retry(sc, txq, bf->bf_mpdu);
478 * Make sure the last desc is reclaimed if it
479 * not a holding desc.
481 INIT_LIST_HEAD(&bf_head);
482 if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
483 bf_next != NULL || !bf_last->bf_stale)
484 list_move_tail(&bf->list, &bf_head);
486 if (!txpending || (tid->state & AGGR_CLEANUP)) {
488 * complete the acked-ones/xretried ones; update
491 spin_lock_bh(&txq->axq_lock);
492 ath_tx_update_baw(sc, tid, seqno);
493 spin_unlock_bh(&txq->axq_lock);
495 if (rc_update && (acked_cnt == 1 || txfail_cnt == 1)) {
496 memcpy(tx_info->control.rates, rates, sizeof(rates));
497 ath_tx_rc_status(sc, bf, ts, nframes, nbad, txok, true);
500 ath_tx_rc_status(sc, bf, ts, nframes, nbad, txok, false);
503 ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
506 /* retry the un-acked ones */
507 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
508 if (bf->bf_next == NULL && bf_last->bf_stale) {
511 tbf = ath_clone_txbuf(sc, bf_last);
513 * Update tx baw and complete the
514 * frame with failed status if we
518 spin_lock_bh(&txq->axq_lock);
519 ath_tx_update_baw(sc, tid, seqno);
520 spin_unlock_bh(&txq->axq_lock);
522 ath_tx_rc_status(sc, bf, ts, nframes,
524 ath_tx_complete_buf(sc, bf, txq,
535 * Put this buffer to the temporary pending
536 * queue to retain ordering
538 __skb_queue_tail(&bf_pending, skb);
544 /* prepend un-acked frames to the beginning of the pending frame queue */
545 if (!skb_queue_empty(&bf_pending)) {
547 ieee80211_sta_set_tim(sta);
549 spin_lock_bh(&txq->axq_lock);
551 tid->ac->clear_ps_filter = true;
552 skb_queue_splice(&bf_pending, &tid->buf_q);
554 ath_tx_queue_tid(txq, tid);
555 spin_unlock_bh(&txq->axq_lock);
558 if (tid->state & AGGR_CLEANUP) {
559 ath_tx_flush_tid(sc, tid);
561 if (tid->baw_head == tid->baw_tail) {
562 tid->state &= ~AGGR_ADDBA_COMPLETE;
563 tid->state &= ~AGGR_CLEANUP;
570 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
573 static bool ath_lookup_legacy(struct ath_buf *bf)
576 struct ieee80211_tx_info *tx_info;
577 struct ieee80211_tx_rate *rates;
581 tx_info = IEEE80211_SKB_CB(skb);
582 rates = tx_info->control.rates;
584 for (i = 0; i < 4; i++) {
585 if (!rates[i].count || rates[i].idx < 0)
588 if (!(rates[i].flags & IEEE80211_TX_RC_MCS))
595 static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
596 struct ath_atx_tid *tid)
599 struct ieee80211_tx_info *tx_info;
600 struct ieee80211_tx_rate *rates;
601 u32 max_4ms_framelen, frmlen;
602 u16 aggr_limit, legacy = 0;
606 tx_info = IEEE80211_SKB_CB(skb);
607 rates = tx_info->control.rates;
610 * Find the lowest frame length among the rate series that will have a
611 * 4ms transmit duration.
612 * TODO - TXOP limit needs to be considered.
614 max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
616 for (i = 0; i < 4; i++) {
617 if (rates[i].count) {
619 if (!(rates[i].flags & IEEE80211_TX_RC_MCS)) {
624 if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
629 if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
632 frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
633 max_4ms_framelen = min(max_4ms_framelen, frmlen);
638 * limit aggregate size by the minimum rate if rate selected is
639 * not a probe rate, if rate selected is a probe rate then
640 * avoid aggregation of this packet.
642 if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy)
645 if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
646 aggr_limit = min((max_4ms_framelen * 3) / 8,
647 (u32)ATH_AMPDU_LIMIT_MAX);
649 aggr_limit = min(max_4ms_framelen,
650 (u32)ATH_AMPDU_LIMIT_MAX);
653 * h/w can accept aggregates up to 16 bit lengths (65535).
654 * The IE, however can hold up to 65536, which shows up here
655 * as zero. Ignore 65536 since we are constrained by hw.
657 if (tid->an->maxampdu)
658 aggr_limit = min(aggr_limit, tid->an->maxampdu);
664 * Returns the number of delimiters to be added to
665 * meet the minimum required mpdudensity.
667 static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
668 struct ath_buf *bf, u16 frmlen,
671 #define FIRST_DESC_NDELIMS 60
672 struct sk_buff *skb = bf->bf_mpdu;
673 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
674 u32 nsymbits, nsymbols;
677 int width, streams, half_gi, ndelim, mindelim;
678 struct ath_frame_info *fi = get_frame_info(bf->bf_mpdu);
680 /* Select standard number of delimiters based on frame length alone */
681 ndelim = ATH_AGGR_GET_NDELIM(frmlen);
684 * If encryption enabled, hardware requires some more padding between
686 * TODO - this could be improved to be dependent on the rate.
687 * The hardware can keep up at lower rates, but not higher rates
689 if ((fi->keyix != ATH9K_TXKEYIX_INVALID) &&
690 !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA))
691 ndelim += ATH_AGGR_ENCRYPTDELIM;
694 * Add delimiter when using RTS/CTS with aggregation
695 * and non enterprise AR9003 card
697 if (first_subfrm && !AR_SREV_9580_10_OR_LATER(sc->sc_ah) &&
698 (sc->sc_ah->ent_mode & AR_ENT_OTP_MIN_PKT_SIZE_DISABLE))
699 ndelim = max(ndelim, FIRST_DESC_NDELIMS);
702 * Convert desired mpdu density from microeconds to bytes based
703 * on highest rate in rate series (i.e. first rate) to determine
704 * required minimum length for subframe. Take into account
705 * whether high rate is 20 or 40Mhz and half or full GI.
707 * If there is no mpdu density restriction, no further calculation
711 if (tid->an->mpdudensity == 0)
714 rix = tx_info->control.rates[0].idx;
715 flags = tx_info->control.rates[0].flags;
716 width = (flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? 1 : 0;
717 half_gi = (flags & IEEE80211_TX_RC_SHORT_GI) ? 1 : 0;
720 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(tid->an->mpdudensity);
722 nsymbols = NUM_SYMBOLS_PER_USEC(tid->an->mpdudensity);
727 streams = HT_RC_2_STREAMS(rix);
728 nsymbits = bits_per_symbol[rix % 8][width] * streams;
729 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
731 if (frmlen < minlen) {
732 mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ;
733 ndelim = max(mindelim, ndelim);
739 static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
741 struct ath_atx_tid *tid,
742 struct list_head *bf_q,
745 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
746 struct ath_buf *bf, *bf_first = NULL, *bf_prev = NULL;
747 int rl = 0, nframes = 0, ndelim, prev_al = 0;
748 u16 aggr_limit = 0, al = 0, bpad = 0,
749 al_delta, h_baw = tid->baw_size / 2;
750 enum ATH_AGGR_STATUS status = ATH_AGGR_DONE;
751 struct ieee80211_tx_info *tx_info;
752 struct ath_frame_info *fi;
757 skb = skb_peek(&tid->buf_q);
758 fi = get_frame_info(skb);
761 bf = ath_tx_setup_buffer(sc, txq, tid, skb);
766 bf->bf_state.bf_type = BUF_AMPDU | BUF_AGGR;
767 seqno = bf->bf_state.seqno;
771 /* do not step over block-ack window */
772 if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno)) {
773 status = ATH_AGGR_BAW_CLOSED;
778 aggr_limit = ath_lookup_rate(sc, bf, tid);
782 /* do not exceed aggregation limit */
783 al_delta = ATH_AGGR_DELIM_SZ + fi->framelen;
786 ((aggr_limit < (al + bpad + al_delta + prev_al)) ||
787 ath_lookup_legacy(bf))) {
788 status = ATH_AGGR_LIMITED;
792 tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
793 if (nframes && ((tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) ||
794 !(tx_info->control.rates[0].flags & IEEE80211_TX_RC_MCS)))
797 /* do not exceed subframe limit */
798 if (nframes >= min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) {
799 status = ATH_AGGR_LIMITED;
803 /* add padding for previous frame to aggregation length */
804 al += bpad + al_delta;
807 * Get the delimiters needed to meet the MPDU
808 * density for this node.
810 ndelim = ath_compute_num_delims(sc, tid, bf_first, fi->framelen,
812 bpad = PADBYTES(al_delta) + (ndelim << 2);
817 /* link buffers of this frame to the aggregate */
819 ath_tx_addto_baw(sc, tid, seqno);
820 bf->bf_state.ndelim = ndelim;
822 __skb_unlink(skb, &tid->buf_q);
823 list_add_tail(&bf->list, bf_q);
825 bf_prev->bf_next = bf;
829 } while (!skb_queue_empty(&tid->buf_q));
839 * pktlen - total bytes (delims + data + fcs + pads + pad delims)
840 * width - 0 for 20 MHz, 1 for 40 MHz
841 * half_gi - to use 4us v/s 3.6 us for symbol time
843 static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, int pktlen,
844 int width, int half_gi, bool shortPreamble)
846 u32 nbits, nsymbits, duration, nsymbols;
849 /* find number of symbols: PLCP + data */
850 streams = HT_RC_2_STREAMS(rix);
851 nbits = (pktlen << 3) + OFDM_PLCP_BITS;
852 nsymbits = bits_per_symbol[rix % 8][width] * streams;
853 nsymbols = (nbits + nsymbits - 1) / nsymbits;
856 duration = SYMBOL_TIME(nsymbols);
858 duration = SYMBOL_TIME_HALFGI(nsymbols);
860 /* addup duration for legacy/ht training and signal fields */
861 duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
866 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf,
867 struct ath_tx_info *info, int len)
869 struct ath_hw *ah = sc->sc_ah;
871 struct ieee80211_tx_info *tx_info;
872 struct ieee80211_tx_rate *rates;
873 const struct ieee80211_rate *rate;
874 struct ieee80211_hdr *hdr;
879 tx_info = IEEE80211_SKB_CB(skb);
880 rates = tx_info->control.rates;
881 hdr = (struct ieee80211_hdr *)skb->data;
883 /* set dur_update_en for l-sig computation except for PS-Poll frames */
884 info->dur_update = !ieee80211_is_pspoll(hdr->frame_control);
887 * We check if Short Preamble is needed for the CTS rate by
888 * checking the BSS's global flag.
889 * But for the rate series, IEEE80211_TX_RC_USE_SHORT_PREAMBLE is used.
891 rate = ieee80211_get_rts_cts_rate(sc->hw, tx_info);
892 info->rtscts_rate = rate->hw_value;
893 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
894 info->rtscts_rate |= rate->hw_value_short;
896 for (i = 0; i < 4; i++) {
897 bool is_40, is_sgi, is_sp;
900 if (!rates[i].count || (rates[i].idx < 0))
904 info->rates[i].Tries = rates[i].count;
906 if (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
907 info->rates[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
908 info->flags |= ATH9K_TXDESC_RTSENA;
909 } else if (rates[i].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
910 info->rates[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
911 info->flags |= ATH9K_TXDESC_CTSENA;
914 if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
915 info->rates[i].RateFlags |= ATH9K_RATESERIES_2040;
916 if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
917 info->rates[i].RateFlags |= ATH9K_RATESERIES_HALFGI;
919 is_sgi = !!(rates[i].flags & IEEE80211_TX_RC_SHORT_GI);
920 is_40 = !!(rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH);
921 is_sp = !!(rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
923 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
925 info->rates[i].Rate = rix | 0x80;
926 info->rates[i].ChSel = ath_txchainmask_reduction(sc,
927 ah->txchainmask, info->rates[i].Rate);
928 info->rates[i].PktDuration = ath_pkt_duration(sc, rix, len,
929 is_40, is_sgi, is_sp);
930 if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
931 info->rates[i].RateFlags |= ATH9K_RATESERIES_STBC;
936 if ((tx_info->band == IEEE80211_BAND_2GHZ) &&
937 !(rate->flags & IEEE80211_RATE_ERP_G))
938 phy = WLAN_RC_PHY_CCK;
940 phy = WLAN_RC_PHY_OFDM;
942 rate = &sc->sbands[tx_info->band].bitrates[rates[i].idx];
943 info->rates[i].Rate = rate->hw_value;
944 if (rate->hw_value_short) {
945 if (rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
946 info->rates[i].Rate |= rate->hw_value_short;
951 if (bf->bf_state.bfs_paprd)
952 info->rates[i].ChSel = ah->txchainmask;
954 info->rates[i].ChSel = ath_txchainmask_reduction(sc,
955 ah->txchainmask, info->rates[i].Rate);
957 info->rates[i].PktDuration = ath9k_hw_computetxtime(sc->sc_ah,
958 phy, rate->bitrate * 100, len, rix, is_sp);
961 /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
962 if (bf_isaggr(bf) && (len > sc->sc_ah->caps.rts_aggr_limit))
963 info->flags &= ~ATH9K_TXDESC_RTSENA;
965 /* ATH9K_TXDESC_RTSENA and ATH9K_TXDESC_CTSENA are mutually exclusive. */
966 if (info->flags & ATH9K_TXDESC_RTSENA)
967 info->flags &= ~ATH9K_TXDESC_CTSENA;
970 static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb)
972 struct ieee80211_hdr *hdr;
973 enum ath9k_pkt_type htype;
976 hdr = (struct ieee80211_hdr *)skb->data;
977 fc = hdr->frame_control;
979 if (ieee80211_is_beacon(fc))
980 htype = ATH9K_PKT_TYPE_BEACON;
981 else if (ieee80211_is_probe_resp(fc))
982 htype = ATH9K_PKT_TYPE_PROBE_RESP;
983 else if (ieee80211_is_atim(fc))
984 htype = ATH9K_PKT_TYPE_ATIM;
985 else if (ieee80211_is_pspoll(fc))
986 htype = ATH9K_PKT_TYPE_PSPOLL;
988 htype = ATH9K_PKT_TYPE_NORMAL;
993 static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
994 struct ath_txq *txq, int len)
996 struct ath_hw *ah = sc->sc_ah;
997 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
998 struct ath_buf *bf_first = bf;
999 struct ath_tx_info info;
1000 bool aggr = !!(bf->bf_state.bf_type & BUF_AGGR);
1002 memset(&info, 0, sizeof(info));
1003 info.is_first = true;
1004 info.is_last = true;
1005 info.txpower = MAX_RATE_POWER;
1006 info.qcu = txq->axq_qnum;
1008 info.flags = ATH9K_TXDESC_INTREQ;
1009 if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
1010 info.flags |= ATH9K_TXDESC_NOACK;
1011 if (tx_info->flags & IEEE80211_TX_CTL_LDPC)
1012 info.flags |= ATH9K_TXDESC_LDPC;
1014 ath_buf_set_rate(sc, bf, &info, len);
1016 if (tx_info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
1017 info.flags |= ATH9K_TXDESC_CLRDMASK;
1019 if (bf->bf_state.bfs_paprd)
1020 info.flags |= (u32) bf->bf_state.bfs_paprd << ATH9K_TXDESC_PAPRD_S;
1024 struct sk_buff *skb = bf->bf_mpdu;
1025 struct ath_frame_info *fi = get_frame_info(skb);
1027 info.type = get_hw_packet_type(skb);
1029 info.link = bf->bf_next->bf_daddr;
1033 info.buf_addr[0] = bf->bf_buf_addr;
1034 info.buf_len[0] = skb->len;
1035 info.pkt_len = fi->framelen;
1036 info.keyix = fi->keyix;
1037 info.keytype = fi->keytype;
1041 info.aggr = AGGR_BUF_FIRST;
1042 else if (!bf->bf_next)
1043 info.aggr = AGGR_BUF_LAST;
1045 info.aggr = AGGR_BUF_MIDDLE;
1047 info.ndelim = bf->bf_state.ndelim;
1048 info.aggr_len = len;
1051 ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
1056 static void ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
1057 struct ath_atx_tid *tid)
1060 enum ATH_AGGR_STATUS status;
1061 struct ieee80211_tx_info *tx_info;
1062 struct list_head bf_q;
1066 if (skb_queue_empty(&tid->buf_q))
1069 INIT_LIST_HEAD(&bf_q);
1071 status = ath_tx_form_aggr(sc, txq, tid, &bf_q, &aggr_len);
1074 * no frames picked up to be aggregated;
1075 * block-ack window is not open.
1077 if (list_empty(&bf_q))
1080 bf = list_first_entry(&bf_q, struct ath_buf, list);
1081 bf->bf_lastbf = list_entry(bf_q.prev, struct ath_buf, list);
1082 tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
1084 if (tid->ac->clear_ps_filter) {
1085 tid->ac->clear_ps_filter = false;
1086 tx_info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1088 tx_info->flags &= ~IEEE80211_TX_CTL_CLEAR_PS_FILT;
1091 /* if only one frame, send as non-aggregate */
1092 if (bf == bf->bf_lastbf) {
1093 aggr_len = get_frame_info(bf->bf_mpdu)->framelen;
1094 bf->bf_state.bf_type = BUF_AMPDU;
1096 TX_STAT_INC(txq->axq_qnum, a_aggr);
1099 ath_tx_fill_desc(sc, bf, txq, aggr_len);
1100 ath_tx_txqaddbuf(sc, txq, &bf_q, false);
1101 } while (txq->axq_ampdu_depth < ATH_AGGR_MIN_QDEPTH &&
1102 status != ATH_AGGR_BAW_CLOSED);
1105 int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
1108 struct ath_atx_tid *txtid;
1109 struct ath_node *an;
1111 an = (struct ath_node *)sta->drv_priv;
1112 txtid = ATH_AN_2_TID(an, tid);
1114 if (txtid->state & (AGGR_CLEANUP | AGGR_ADDBA_COMPLETE))
1117 txtid->state |= AGGR_ADDBA_PROGRESS;
1118 txtid->paused = true;
1119 *ssn = txtid->seq_start = txtid->seq_next;
1121 memset(txtid->tx_buf, 0, sizeof(txtid->tx_buf));
1122 txtid->baw_head = txtid->baw_tail = 0;
1127 void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
1129 struct ath_node *an = (struct ath_node *)sta->drv_priv;
1130 struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
1131 struct ath_txq *txq = txtid->ac->txq;
1133 if (txtid->state & AGGR_CLEANUP)
1136 if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
1137 txtid->state &= ~AGGR_ADDBA_PROGRESS;
1141 spin_lock_bh(&txq->axq_lock);
1142 txtid->paused = true;
1145 * If frames are still being transmitted for this TID, they will be
1146 * cleaned up during tx completion. To prevent race conditions, this
1147 * TID can only be reused after all in-progress subframes have been
1150 if (txtid->baw_head != txtid->baw_tail)
1151 txtid->state |= AGGR_CLEANUP;
1153 txtid->state &= ~AGGR_ADDBA_COMPLETE;
1154 spin_unlock_bh(&txq->axq_lock);
1156 ath_tx_flush_tid(sc, txtid);
1159 bool ath_tx_aggr_sleep(struct ath_softc *sc, struct ath_node *an)
1161 struct ath_atx_tid *tid;
1162 struct ath_atx_ac *ac;
1163 struct ath_txq *txq;
1164 bool buffered = false;
1167 for (tidno = 0, tid = &an->tid[tidno];
1168 tidno < WME_NUM_TID; tidno++, tid++) {
1176 spin_lock_bh(&txq->axq_lock);
1178 if (!skb_queue_empty(&tid->buf_q))
1182 list_del(&tid->list);
1186 list_del(&ac->list);
1189 spin_unlock_bh(&txq->axq_lock);
1195 void ath_tx_aggr_wakeup(struct ath_softc *sc, struct ath_node *an)
1197 struct ath_atx_tid *tid;
1198 struct ath_atx_ac *ac;
1199 struct ath_txq *txq;
1202 for (tidno = 0, tid = &an->tid[tidno];
1203 tidno < WME_NUM_TID; tidno++, tid++) {
1208 spin_lock_bh(&txq->axq_lock);
1209 ac->clear_ps_filter = true;
1211 if (!skb_queue_empty(&tid->buf_q) && !tid->paused) {
1212 ath_tx_queue_tid(txq, tid);
1213 ath_txq_schedule(sc, txq);
1216 spin_unlock_bh(&txq->axq_lock);
1220 void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
1222 struct ath_atx_tid *txtid;
1223 struct ath_node *an;
1225 an = (struct ath_node *)sta->drv_priv;
1227 if (sc->sc_flags & SC_OP_TXAGGR) {
1228 txtid = ATH_AN_2_TID(an, tid);
1230 IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
1231 txtid->state |= AGGR_ADDBA_COMPLETE;
1232 txtid->state &= ~AGGR_ADDBA_PROGRESS;
1233 ath_tx_resume_tid(sc, txtid);
1237 /********************/
1238 /* Queue Management */
1239 /********************/
1241 static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
1242 struct ath_txq *txq)
1244 struct ath_atx_ac *ac, *ac_tmp;
1245 struct ath_atx_tid *tid, *tid_tmp;
1247 list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
1248 list_del(&ac->list);
1250 list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) {
1251 list_del(&tid->list);
1253 ath_tid_drain(sc, txq, tid);
1258 struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
1260 struct ath_hw *ah = sc->sc_ah;
1261 struct ath_common *common = ath9k_hw_common(ah);
1262 struct ath9k_tx_queue_info qi;
1263 static const int subtype_txq_to_hwq[] = {
1264 [WME_AC_BE] = ATH_TXQ_AC_BE,
1265 [WME_AC_BK] = ATH_TXQ_AC_BK,
1266 [WME_AC_VI] = ATH_TXQ_AC_VI,
1267 [WME_AC_VO] = ATH_TXQ_AC_VO,
1271 memset(&qi, 0, sizeof(qi));
1272 qi.tqi_subtype = subtype_txq_to_hwq[subtype];
1273 qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
1274 qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
1275 qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
1276 qi.tqi_physCompBuf = 0;
1279 * Enable interrupts only for EOL and DESC conditions.
1280 * We mark tx descriptors to receive a DESC interrupt
1281 * when a tx queue gets deep; otherwise waiting for the
1282 * EOL to reap descriptors. Note that this is done to
1283 * reduce interrupt load and this only defers reaping
1284 * descriptors, never transmitting frames. Aside from
1285 * reducing interrupts this also permits more concurrency.
1286 * The only potential downside is if the tx queue backs
1287 * up in which case the top half of the kernel may backup
1288 * due to a lack of tx descriptors.
1290 * The UAPSD queue is an exception, since we take a desc-
1291 * based intr on the EOSP frames.
1293 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1294 qi.tqi_qflags = TXQ_FLAG_TXOKINT_ENABLE |
1295 TXQ_FLAG_TXERRINT_ENABLE;
1297 if (qtype == ATH9K_TX_QUEUE_UAPSD)
1298 qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE;
1300 qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |
1301 TXQ_FLAG_TXDESCINT_ENABLE;
1303 axq_qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi);
1304 if (axq_qnum == -1) {
1306 * NB: don't print a message, this happens
1307 * normally on parts with too few tx queues
1311 if (axq_qnum >= ARRAY_SIZE(sc->tx.txq)) {
1312 ath_err(common, "qnum %u out of range, max %zu!\n",
1313 axq_qnum, ARRAY_SIZE(sc->tx.txq));
1314 ath9k_hw_releasetxqueue(ah, axq_qnum);
1317 if (!ATH_TXQ_SETUP(sc, axq_qnum)) {
1318 struct ath_txq *txq = &sc->tx.txq[axq_qnum];
1320 txq->axq_qnum = axq_qnum;
1321 txq->mac80211_qnum = -1;
1322 txq->axq_link = NULL;
1323 INIT_LIST_HEAD(&txq->axq_q);
1324 INIT_LIST_HEAD(&txq->axq_acq);
1325 spin_lock_init(&txq->axq_lock);
1327 txq->axq_ampdu_depth = 0;
1328 txq->axq_tx_inprogress = false;
1329 sc->tx.txqsetup |= 1<<axq_qnum;
1331 txq->txq_headidx = txq->txq_tailidx = 0;
1332 for (i = 0; i < ATH_TXFIFO_DEPTH; i++)
1333 INIT_LIST_HEAD(&txq->txq_fifo[i]);
1335 return &sc->tx.txq[axq_qnum];
1338 int ath_txq_update(struct ath_softc *sc, int qnum,
1339 struct ath9k_tx_queue_info *qinfo)
1341 struct ath_hw *ah = sc->sc_ah;
1343 struct ath9k_tx_queue_info qi;
1345 if (qnum == sc->beacon.beaconq) {
1347 * XXX: for beacon queue, we just save the parameter.
1348 * It will be picked up by ath_beaconq_config when
1351 sc->beacon.beacon_qi = *qinfo;
1355 BUG_ON(sc->tx.txq[qnum].axq_qnum != qnum);
1357 ath9k_hw_get_txq_props(ah, qnum, &qi);
1358 qi.tqi_aifs = qinfo->tqi_aifs;
1359 qi.tqi_cwmin = qinfo->tqi_cwmin;
1360 qi.tqi_cwmax = qinfo->tqi_cwmax;
1361 qi.tqi_burstTime = qinfo->tqi_burstTime;
1362 qi.tqi_readyTime = qinfo->tqi_readyTime;
1364 if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
1365 ath_err(ath9k_hw_common(sc->sc_ah),
1366 "Unable to update hardware queue %u!\n", qnum);
1369 ath9k_hw_resettxqueue(ah, qnum);
1375 int ath_cabq_update(struct ath_softc *sc)
1377 struct ath9k_tx_queue_info qi;
1378 struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;
1379 int qnum = sc->beacon.cabq->axq_qnum;
1381 ath9k_hw_get_txq_props(sc->sc_ah, qnum, &qi);
1383 * Ensure the readytime % is within the bounds.
1385 if (sc->config.cabqReadytime < ATH9K_READY_TIME_LO_BOUND)
1386 sc->config.cabqReadytime = ATH9K_READY_TIME_LO_BOUND;
1387 else if (sc->config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND)
1388 sc->config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND;
1390 qi.tqi_readyTime = (cur_conf->beacon_interval *
1391 sc->config.cabqReadytime) / 100;
1392 ath_txq_update(sc, qnum, &qi);
1397 static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
1399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
1400 return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
1403 static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
1404 struct list_head *list, bool retry_tx)
1405 __releases(txq->axq_lock)
1406 __acquires(txq->axq_lock)
1408 struct ath_buf *bf, *lastbf;
1409 struct list_head bf_head;
1410 struct ath_tx_status ts;
1412 memset(&ts, 0, sizeof(ts));
1413 INIT_LIST_HEAD(&bf_head);
1415 while (!list_empty(list)) {
1416 bf = list_first_entry(list, struct ath_buf, list);
1419 list_del(&bf->list);
1421 ath_tx_return_buffer(sc, bf);
1425 lastbf = bf->bf_lastbf;
1426 list_cut_position(&bf_head, list, &lastbf->list);
1429 if (bf_is_ampdu_not_probing(bf))
1430 txq->axq_ampdu_depth--;
1432 spin_unlock_bh(&txq->axq_lock);
1434 ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0,
1437 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
1438 spin_lock_bh(&txq->axq_lock);
1443 * Drain a given TX queue (could be Beacon or Data)
1445 * This assumes output has been stopped and
1446 * we do not need to block ath_tx_tasklet.
1448 void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
1450 spin_lock_bh(&txq->axq_lock);
1451 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1452 int idx = txq->txq_tailidx;
1454 while (!list_empty(&txq->txq_fifo[idx])) {
1455 ath_drain_txq_list(sc, txq, &txq->txq_fifo[idx],
1458 INCR(idx, ATH_TXFIFO_DEPTH);
1460 txq->txq_tailidx = idx;
1463 txq->axq_link = NULL;
1464 txq->axq_tx_inprogress = false;
1465 ath_drain_txq_list(sc, txq, &txq->axq_q, retry_tx);
1467 /* flush any pending frames if aggregation is enabled */
1468 if ((sc->sc_flags & SC_OP_TXAGGR) && !retry_tx)
1469 ath_txq_drain_pending_buffers(sc, txq);
1471 spin_unlock_bh(&txq->axq_lock);
1474 bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
1476 struct ath_hw *ah = sc->sc_ah;
1477 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1478 struct ath_txq *txq;
1481 if (sc->sc_flags & SC_OP_INVALID)
1484 ath9k_hw_abort_tx_dma(ah);
1486 /* Check if any queue remains active */
1487 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1488 if (!ATH_TXQ_SETUP(sc, i))
1491 npend += ath9k_hw_numtxpending(ah, sc->tx.txq[i].axq_qnum);
1495 ath_err(common, "Failed to stop TX DMA!\n");
1497 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1498 if (!ATH_TXQ_SETUP(sc, i))
1502 * The caller will resume queues with ieee80211_wake_queues.
1503 * Mark the queue as not stopped to prevent ath_tx_complete
1504 * from waking the queue too early.
1506 txq = &sc->tx.txq[i];
1507 txq->stopped = false;
1508 ath_draintxq(sc, txq, retry_tx);
1514 void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
1516 ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum);
1517 sc->tx.txqsetup &= ~(1<<txq->axq_qnum);
1520 /* For each axq_acq entry, for each tid, try to schedule packets
1521 * for transmit until ampdu_depth has reached min Q depth.
1523 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
1525 struct ath_atx_ac *ac, *ac_tmp, *last_ac;
1526 struct ath_atx_tid *tid, *last_tid;
1528 if (work_pending(&sc->hw_reset_work) || list_empty(&txq->axq_acq) ||
1529 txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
1532 ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
1533 last_ac = list_entry(txq->axq_acq.prev, struct ath_atx_ac, list);
1535 list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
1536 last_tid = list_entry(ac->tid_q.prev, struct ath_atx_tid, list);
1537 list_del(&ac->list);
1540 while (!list_empty(&ac->tid_q)) {
1541 tid = list_first_entry(&ac->tid_q, struct ath_atx_tid,
1543 list_del(&tid->list);
1549 ath_tx_sched_aggr(sc, txq, tid);
1552 * add tid to round-robin queue if more frames
1553 * are pending for the tid
1555 if (!skb_queue_empty(&tid->buf_q))
1556 ath_tx_queue_tid(txq, tid);
1558 if (tid == last_tid ||
1559 txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
1563 if (!list_empty(&ac->tid_q)) {
1566 list_add_tail(&ac->list, &txq->axq_acq);
1570 if (ac == last_ac ||
1571 txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH)
1581 * Insert a chain of ath_buf (descriptors) on a txq and
1582 * assume the descriptors are already chained together by caller.
1584 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
1585 struct list_head *head, bool internal)
1587 struct ath_hw *ah = sc->sc_ah;
1588 struct ath_common *common = ath9k_hw_common(ah);
1589 struct ath_buf *bf, *bf_last;
1590 bool puttxbuf = false;
1594 * Insert the frame on the outbound list and
1595 * pass it on to the hardware.
1598 if (list_empty(head))
1601 edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1602 bf = list_first_entry(head, struct ath_buf, list);
1603 bf_last = list_entry(head->prev, struct ath_buf, list);
1605 ath_dbg(common, ATH_DBG_QUEUE,
1606 "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth);
1608 if (edma && list_empty(&txq->txq_fifo[txq->txq_headidx])) {
1609 list_splice_tail_init(head, &txq->txq_fifo[txq->txq_headidx]);
1610 INCR(txq->txq_headidx, ATH_TXFIFO_DEPTH);
1613 list_splice_tail_init(head, &txq->axq_q);
1615 if (txq->axq_link) {
1616 ath9k_hw_set_desc_link(ah, txq->axq_link, bf->bf_daddr);
1617 ath_dbg(common, ATH_DBG_XMIT,
1618 "link[%u] (%p)=%llx (%p)\n",
1619 txq->axq_qnum, txq->axq_link,
1620 ito64(bf->bf_daddr), bf->bf_desc);
1624 txq->axq_link = bf_last->bf_desc;
1628 TX_STAT_INC(txq->axq_qnum, puttxbuf);
1629 ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
1630 ath_dbg(common, ATH_DBG_XMIT, "TXDP[%u] = %llx (%p)\n",
1631 txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
1635 TX_STAT_INC(txq->axq_qnum, txstart);
1636 ath9k_hw_txstart(ah, txq->axq_qnum);
1641 if (bf_is_ampdu_not_probing(bf))
1642 txq->axq_ampdu_depth++;
1646 static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
1647 struct sk_buff *skb, struct ath_tx_control *txctl)
1649 struct ath_frame_info *fi = get_frame_info(skb);
1650 struct list_head bf_head;
1654 * Do not queue to h/w when any of the following conditions is true:
1655 * - there are pending frames in software queue
1656 * - the TID is currently paused for ADDBA/BAR request
1657 * - seqno is not within block-ack window
1658 * - h/w queue depth exceeds low water mark
1660 if (!skb_queue_empty(&tid->buf_q) || tid->paused ||
1661 !BAW_WITHIN(tid->seq_start, tid->baw_size, tid->seq_next) ||
1662 txctl->txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) {
1664 * Add this frame to software queue for scheduling later
1667 TX_STAT_INC(txctl->txq->axq_qnum, a_queued_sw);
1668 __skb_queue_tail(&tid->buf_q, skb);
1669 if (!txctl->an || !txctl->an->sleeping)
1670 ath_tx_queue_tid(txctl->txq, tid);
1674 bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
1678 bf->bf_state.bf_type = BUF_AMPDU;
1679 INIT_LIST_HEAD(&bf_head);
1680 list_add(&bf->list, &bf_head);
1682 /* Add sub-frame to BAW */
1683 ath_tx_addto_baw(sc, tid, bf->bf_state.seqno);
1685 /* Queue to h/w without aggregation */
1686 TX_STAT_INC(txctl->txq->axq_qnum, a_queued_hw);
1688 ath_tx_fill_desc(sc, bf, txctl->txq, fi->framelen);
1689 ath_tx_txqaddbuf(sc, txctl->txq, &bf_head, false);
1692 static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
1693 struct ath_atx_tid *tid, struct sk_buff *skb)
1695 struct ath_frame_info *fi = get_frame_info(skb);
1696 struct list_head bf_head;
1701 bf = ath_tx_setup_buffer(sc, txq, tid, skb);
1706 INIT_LIST_HEAD(&bf_head);
1707 list_add_tail(&bf->list, &bf_head);
1708 bf->bf_state.bf_type = 0;
1710 /* update starting sequence number for subsequent ADDBA request */
1712 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
1715 ath_tx_fill_desc(sc, bf, txq, fi->framelen);
1716 ath_tx_txqaddbuf(sc, txq, &bf_head, false);
1717 TX_STAT_INC(txq->axq_qnum, queued);
1720 static void setup_frame_info(struct ieee80211_hw *hw, struct sk_buff *skb,
1723 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1724 struct ieee80211_sta *sta = tx_info->control.sta;
1725 struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
1726 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1727 struct ath_frame_info *fi = get_frame_info(skb);
1728 struct ath_node *an = NULL;
1729 enum ath9k_key_type keytype;
1731 keytype = ath9k_cmn_get_hw_crypto_keytype(skb);
1734 an = (struct ath_node *) sta->drv_priv;
1736 memset(fi, 0, sizeof(*fi));
1738 fi->keyix = hw_key->hw_key_idx;
1739 else if (an && ieee80211_is_data(hdr->frame_control) && an->ps_key > 0)
1740 fi->keyix = an->ps_key;
1742 fi->keyix = ATH9K_TXKEYIX_INVALID;
1743 fi->keytype = keytype;
1744 fi->framelen = framelen;
1747 u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate)
1749 struct ath_hw *ah = sc->sc_ah;
1750 struct ath9k_channel *curchan = ah->curchan;
1751 if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) &&
1752 (curchan->channelFlags & CHANNEL_5GHZ) &&
1753 (chainmask == 0x7) && (rate < 0x90))
1760 * Assign a descriptor (and sequence number if necessary,
1761 * and map buffer for DMA. Frees skb on error
1763 static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
1764 struct ath_txq *txq,
1765 struct ath_atx_tid *tid,
1766 struct sk_buff *skb)
1768 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1769 struct ath_frame_info *fi = get_frame_info(skb);
1770 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1774 bf = ath_tx_get_buffer(sc);
1776 ath_dbg(common, ATH_DBG_XMIT, "TX buffers are full\n");
1780 ATH_TXBUF_RESET(bf);
1783 seqno = tid->seq_next;
1784 hdr->seq_ctrl = cpu_to_le16(tid->seq_next << IEEE80211_SEQ_SEQ_SHIFT);
1785 INCR(tid->seq_next, IEEE80211_SEQ_MAX);
1786 bf->bf_state.seqno = seqno;
1791 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
1792 skb->len, DMA_TO_DEVICE);
1793 if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
1795 bf->bf_buf_addr = 0;
1796 ath_err(ath9k_hw_common(sc->sc_ah),
1797 "dma_mapping_error() on TX\n");
1798 ath_tx_return_buffer(sc, bf);
1807 dev_kfree_skb_any(skb);
1811 /* FIXME: tx power */
1812 static void ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
1813 struct ath_tx_control *txctl)
1815 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1816 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1817 struct ath_atx_tid *tid = NULL;
1821 spin_lock_bh(&txctl->txq->axq_lock);
1822 if ((sc->sc_flags & SC_OP_TXAGGR) && txctl->an &&
1823 ieee80211_is_data_qos(hdr->frame_control)) {
1824 tidno = ieee80211_get_qos_ctl(hdr)[0] &
1825 IEEE80211_QOS_CTL_TID_MASK;
1826 tid = ATH_AN_2_TID(txctl->an, tidno);
1828 WARN_ON(tid->ac->txq != txctl->txq);
1831 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
1833 * Try aggregation if it's a unicast data frame
1834 * and the destination is HT capable.
1836 ath_tx_send_ampdu(sc, tid, skb, txctl);
1838 bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
1842 bf->bf_state.bfs_paprd = txctl->paprd;
1845 bf->bf_state.bfs_paprd_timestamp = jiffies;
1847 ath_tx_send_normal(sc, txctl->txq, tid, skb);
1851 spin_unlock_bh(&txctl->txq->axq_lock);
1854 /* Upon failure caller should free skb */
1855 int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
1856 struct ath_tx_control *txctl)
1858 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1860 struct ieee80211_sta *sta = info->control.sta;
1861 struct ieee80211_vif *vif = info->control.vif;
1862 struct ath_softc *sc = hw->priv;
1863 struct ath_txq *txq = txctl->txq;
1864 int padpos, padsize;
1865 int frmlen = skb->len + FCS_LEN;
1868 /* NOTE: sta can be NULL according to net/mac80211.h */
1870 txctl->an = (struct ath_node *)sta->drv_priv;
1872 if (info->control.hw_key)
1873 frmlen += info->control.hw_key->icv_len;
1876 * As a temporary workaround, assign seq# here; this will likely need
1877 * to be cleaned up to work better with Beacon transmission and virtual
1880 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1881 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
1882 sc->tx.seq_no += 0x10;
1883 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
1884 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
1887 /* Add the padding after the header if this is not already done */
1888 padpos = ath9k_cmn_padpos(hdr->frame_control);
1889 padsize = padpos & 3;
1890 if (padsize && skb->len > padpos) {
1891 if (skb_headroom(skb) < padsize)
1894 skb_push(skb, padsize);
1895 memmove(skb->data, skb->data + padsize, padpos);
1898 if ((vif && vif->type != NL80211_IFTYPE_AP &&
1899 vif->type != NL80211_IFTYPE_AP_VLAN) ||
1900 !ieee80211_is_data(hdr->frame_control))
1901 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1903 setup_frame_info(hw, skb, frmlen);
1906 * At this point, the vif, hw_key and sta pointers in the tx control
1907 * info are no longer valid (overwritten by the ath_frame_info data.
1910 q = skb_get_queue_mapping(skb);
1911 spin_lock_bh(&txq->axq_lock);
1912 if (txq == sc->tx.txq_map[q] &&
1913 ++txq->pending_frames > ATH_MAX_QDEPTH && !txq->stopped) {
1914 ieee80211_stop_queue(sc->hw, q);
1917 spin_unlock_bh(&txq->axq_lock);
1919 ath_tx_start_dma(sc, skb, txctl);
1927 static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
1928 int tx_flags, struct ath_txq *txq)
1930 struct ieee80211_hw *hw = sc->hw;
1931 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1932 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1933 struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
1934 int q, padpos, padsize;
1936 ath_dbg(common, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
1938 if (tx_flags & ATH_TX_BAR)
1939 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1941 if (!(tx_flags & ATH_TX_ERROR))
1942 /* Frame was ACKed */
1943 tx_info->flags |= IEEE80211_TX_STAT_ACK;
1945 padpos = ath9k_cmn_padpos(hdr->frame_control);
1946 padsize = padpos & 3;
1947 if (padsize && skb->len>padpos+padsize) {
1949 * Remove MAC header padding before giving the frame back to
1952 memmove(skb->data + padsize, skb->data, padpos);
1953 skb_pull(skb, padsize);
1956 if (sc->ps_flags & PS_WAIT_FOR_TX_ACK) {
1957 sc->ps_flags &= ~PS_WAIT_FOR_TX_ACK;
1958 ath_dbg(common, ATH_DBG_PS,
1959 "Going back to sleep after having received TX status (0x%lx)\n",
1960 sc->ps_flags & (PS_WAIT_FOR_BEACON |
1962 PS_WAIT_FOR_PSPOLL_DATA |
1963 PS_WAIT_FOR_TX_ACK));
1966 q = skb_get_queue_mapping(skb);
1967 if (txq == sc->tx.txq_map[q]) {
1968 spin_lock_bh(&txq->axq_lock);
1969 if (WARN_ON(--txq->pending_frames < 0))
1970 txq->pending_frames = 0;
1972 if (txq->stopped && txq->pending_frames < ATH_MAX_QDEPTH) {
1973 ieee80211_wake_queue(sc->hw, q);
1976 spin_unlock_bh(&txq->axq_lock);
1979 ieee80211_tx_status(hw, skb);
1982 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
1983 struct ath_txq *txq, struct list_head *bf_q,
1984 struct ath_tx_status *ts, int txok, int sendbar)
1986 struct sk_buff *skb = bf->bf_mpdu;
1987 unsigned long flags;
1991 tx_flags = ATH_TX_BAR;
1994 tx_flags |= ATH_TX_ERROR;
1996 dma_unmap_single(sc->dev, bf->bf_buf_addr, skb->len, DMA_TO_DEVICE);
1997 bf->bf_buf_addr = 0;
1999 if (bf->bf_state.bfs_paprd) {
2000 if (time_after(jiffies,
2001 bf->bf_state.bfs_paprd_timestamp +
2002 msecs_to_jiffies(ATH_PAPRD_TIMEOUT)))
2003 dev_kfree_skb_any(skb);
2005 complete(&sc->paprd_complete);
2007 ath_debug_stat_tx(sc, bf, ts, txq, tx_flags);
2008 ath_tx_complete(sc, skb, tx_flags, txq);
2010 /* At this point, skb (bf->bf_mpdu) is consumed...make sure we don't
2011 * accidentally reference it later.
2016 * Return the list of ath_buf of this mpdu to free queue
2018 spin_lock_irqsave(&sc->tx.txbuflock, flags);
2019 list_splice_tail_init(bf_q, &sc->tx.txbuf);
2020 spin_unlock_irqrestore(&sc->tx.txbuflock, flags);
2023 static void ath_tx_rc_status(struct ath_softc *sc, struct ath_buf *bf,
2024 struct ath_tx_status *ts, int nframes, int nbad,
2025 int txok, bool update_rc)
2027 struct sk_buff *skb = bf->bf_mpdu;
2028 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2029 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
2030 struct ieee80211_hw *hw = sc->hw;
2031 struct ath_hw *ah = sc->sc_ah;
2035 tx_info->status.ack_signal = ts->ts_rssi;
2037 tx_rateindex = ts->ts_rateindex;
2038 WARN_ON(tx_rateindex >= hw->max_rates);
2040 if (ts->ts_status & ATH9K_TXERR_FILT)
2041 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
2042 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && update_rc) {
2043 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
2045 BUG_ON(nbad > nframes);
2047 tx_info->status.ampdu_len = nframes;
2048 tx_info->status.ampdu_ack_len = nframes - nbad;
2051 if ((ts->ts_status & ATH9K_TXERR_FILT) == 0 &&
2052 (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) == 0 && update_rc) {
2054 * If an underrun error is seen assume it as an excessive
2055 * retry only if max frame trigger level has been reached
2056 * (2 KB for single stream, and 4 KB for dual stream).
2057 * Adjust the long retry as if the frame was tried
2058 * hw->max_rate_tries times to affect how rate control updates
2059 * PER for the failed rate.
2060 * In case of congestion on the bus penalizing this type of
2061 * underruns should help hardware actually transmit new frames
2062 * successfully by eventually preferring slower rates.
2063 * This itself should also alleviate congestion on the bus.
2065 if (ieee80211_is_data(hdr->frame_control) &&
2066 (ts->ts_flags & (ATH9K_TX_DATA_UNDERRUN |
2067 ATH9K_TX_DELIM_UNDERRUN)) &&
2068 ah->tx_trig_level >= sc->sc_ah->config.max_txtrig_level)
2069 tx_info->status.rates[tx_rateindex].count =
2073 for (i = tx_rateindex + 1; i < hw->max_rates; i++) {
2074 tx_info->status.rates[i].count = 0;
2075 tx_info->status.rates[i].idx = -1;
2078 tx_info->status.rates[tx_rateindex].count = ts->ts_longretry + 1;
2081 static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
2082 struct ath_tx_status *ts, struct ath_buf *bf,
2083 struct list_head *bf_head)
2084 __releases(txq->axq_lock)
2085 __acquires(txq->axq_lock)
2090 txok = !(ts->ts_status & ATH9K_TXERR_MASK);
2091 txq->axq_tx_inprogress = false;
2092 if (bf_is_ampdu_not_probing(bf))
2093 txq->axq_ampdu_depth--;
2095 spin_unlock_bh(&txq->axq_lock);
2097 if (!bf_isampdu(bf)) {
2098 ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok, true);
2099 ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok, 0);
2101 ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok, true);
2103 spin_lock_bh(&txq->axq_lock);
2105 if (sc->sc_flags & SC_OP_TXAGGR)
2106 ath_txq_schedule(sc, txq);
2109 static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
2111 struct ath_hw *ah = sc->sc_ah;
2112 struct ath_common *common = ath9k_hw_common(ah);
2113 struct ath_buf *bf, *lastbf, *bf_held = NULL;
2114 struct list_head bf_head;
2115 struct ath_desc *ds;
2116 struct ath_tx_status ts;
2119 ath_dbg(common, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
2120 txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
2123 spin_lock_bh(&txq->axq_lock);
2125 if (work_pending(&sc->hw_reset_work))
2128 if (list_empty(&txq->axq_q)) {
2129 txq->axq_link = NULL;
2130 if (sc->sc_flags & SC_OP_TXAGGR)
2131 ath_txq_schedule(sc, txq);
2134 bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
2137 * There is a race condition that a BH gets scheduled
2138 * after sw writes TxE and before hw re-load the last
2139 * descriptor to get the newly chained one.
2140 * Software must keep the last DONE descriptor as a
2141 * holding descriptor - software does so by marking
2142 * it with the STALE flag.
2147 if (list_is_last(&bf_held->list, &txq->axq_q))
2150 bf = list_entry(bf_held->list.next, struct ath_buf,
2154 lastbf = bf->bf_lastbf;
2155 ds = lastbf->bf_desc;
2157 memset(&ts, 0, sizeof(ts));
2158 status = ath9k_hw_txprocdesc(ah, ds, &ts);
2159 if (status == -EINPROGRESS)
2162 TX_STAT_INC(txq->axq_qnum, txprocdesc);
2165 * Remove ath_buf's of the same transmit unit from txq,
2166 * however leave the last descriptor back as the holding
2167 * descriptor for hw.
2169 lastbf->bf_stale = true;
2170 INIT_LIST_HEAD(&bf_head);
2171 if (!list_is_singular(&lastbf->list))
2172 list_cut_position(&bf_head,
2173 &txq->axq_q, lastbf->list.prev);
2176 list_del(&bf_held->list);
2177 ath_tx_return_buffer(sc, bf_held);
2180 ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
2182 spin_unlock_bh(&txq->axq_lock);
2185 static void ath_tx_complete_poll_work(struct work_struct *work)
2187 struct ath_softc *sc = container_of(work, struct ath_softc,
2188 tx_complete_work.work);
2189 struct ath_txq *txq;
2191 bool needreset = false;
2192 #ifdef CONFIG_ATH9K_DEBUGFS
2193 sc->tx_complete_poll_work_seen++;
2196 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
2197 if (ATH_TXQ_SETUP(sc, i)) {
2198 txq = &sc->tx.txq[i];
2199 spin_lock_bh(&txq->axq_lock);
2200 if (txq->axq_depth) {
2201 if (txq->axq_tx_inprogress) {
2203 spin_unlock_bh(&txq->axq_lock);
2206 txq->axq_tx_inprogress = true;
2209 spin_unlock_bh(&txq->axq_lock);
2213 ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
2214 "tx hung, resetting the chip\n");
2215 ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
2218 ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
2219 msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT));
2224 void ath_tx_tasklet(struct ath_softc *sc)
2227 u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1);
2229 ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask);
2231 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2232 if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
2233 ath_tx_processq(sc, &sc->tx.txq[i]);
2237 void ath_tx_edma_tasklet(struct ath_softc *sc)
2239 struct ath_tx_status ts;
2240 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2241 struct ath_hw *ah = sc->sc_ah;
2242 struct ath_txq *txq;
2243 struct ath_buf *bf, *lastbf;
2244 struct list_head bf_head;
2248 if (work_pending(&sc->hw_reset_work))
2251 status = ath9k_hw_txprocdesc(ah, NULL, (void *)&ts);
2252 if (status == -EINPROGRESS)
2254 if (status == -EIO) {
2255 ath_dbg(common, ATH_DBG_XMIT,
2256 "Error processing tx status\n");
2260 /* Skip beacon completions */
2261 if (ts.qid == sc->beacon.beaconq)
2264 txq = &sc->tx.txq[ts.qid];
2266 spin_lock_bh(&txq->axq_lock);
2268 if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
2269 spin_unlock_bh(&txq->axq_lock);
2273 bf = list_first_entry(&txq->txq_fifo[txq->txq_tailidx],
2274 struct ath_buf, list);
2275 lastbf = bf->bf_lastbf;
2277 INIT_LIST_HEAD(&bf_head);
2278 list_cut_position(&bf_head, &txq->txq_fifo[txq->txq_tailidx],
2281 if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
2282 INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
2284 if (!list_empty(&txq->axq_q)) {
2285 struct list_head bf_q;
2287 INIT_LIST_HEAD(&bf_q);
2288 txq->axq_link = NULL;
2289 list_splice_tail_init(&txq->axq_q, &bf_q);
2290 ath_tx_txqaddbuf(sc, txq, &bf_q, true);
2294 ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
2295 spin_unlock_bh(&txq->axq_lock);
2303 static int ath_txstatus_setup(struct ath_softc *sc, int size)
2305 struct ath_descdma *dd = &sc->txsdma;
2306 u8 txs_len = sc->sc_ah->caps.txs_len;
2308 dd->dd_desc_len = size * txs_len;
2309 dd->dd_desc = dma_alloc_coherent(sc->dev, dd->dd_desc_len,
2310 &dd->dd_desc_paddr, GFP_KERNEL);
2317 static int ath_tx_edma_init(struct ath_softc *sc)
2321 err = ath_txstatus_setup(sc, ATH_TXSTATUS_RING_SIZE);
2323 ath9k_hw_setup_statusring(sc->sc_ah, sc->txsdma.dd_desc,
2324 sc->txsdma.dd_desc_paddr,
2325 ATH_TXSTATUS_RING_SIZE);
2330 static void ath_tx_edma_cleanup(struct ath_softc *sc)
2332 struct ath_descdma *dd = &sc->txsdma;
2334 dma_free_coherent(sc->dev, dd->dd_desc_len, dd->dd_desc,
2338 int ath_tx_init(struct ath_softc *sc, int nbufs)
2340 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2343 spin_lock_init(&sc->tx.txbuflock);
2345 error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
2349 "Failed to allocate tx descriptors: %d\n", error);
2353 error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
2354 "beacon", ATH_BCBUF, 1, 1);
2357 "Failed to allocate beacon descriptors: %d\n", error);
2361 INIT_DELAYED_WORK(&sc->tx_complete_work, ath_tx_complete_poll_work);
2363 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
2364 error = ath_tx_edma_init(sc);
2376 void ath_tx_cleanup(struct ath_softc *sc)
2378 if (sc->beacon.bdma.dd_desc_len != 0)
2379 ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf);
2381 if (sc->tx.txdma.dd_desc_len != 0)
2382 ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf);
2384 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
2385 ath_tx_edma_cleanup(sc);
2388 void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
2390 struct ath_atx_tid *tid;
2391 struct ath_atx_ac *ac;
2394 for (tidno = 0, tid = &an->tid[tidno];
2395 tidno < WME_NUM_TID;
2399 tid->seq_start = tid->seq_next = 0;
2400 tid->baw_size = WME_MAX_BA;
2401 tid->baw_head = tid->baw_tail = 0;
2403 tid->paused = false;
2404 tid->state &= ~AGGR_CLEANUP;
2405 __skb_queue_head_init(&tid->buf_q);
2406 acno = TID_TO_WME_AC(tidno);
2407 tid->ac = &an->ac[acno];
2408 tid->state &= ~AGGR_ADDBA_COMPLETE;
2409 tid->state &= ~AGGR_ADDBA_PROGRESS;
2412 for (acno = 0, ac = &an->ac[acno];
2413 acno < WME_NUM_AC; acno++, ac++) {
2415 ac->txq = sc->tx.txq_map[acno];
2416 INIT_LIST_HEAD(&ac->tid_q);
2420 void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
2422 struct ath_atx_ac *ac;
2423 struct ath_atx_tid *tid;
2424 struct ath_txq *txq;
2427 for (tidno = 0, tid = &an->tid[tidno];
2428 tidno < WME_NUM_TID; tidno++, tid++) {
2433 spin_lock_bh(&txq->axq_lock);
2436 list_del(&tid->list);
2441 list_del(&ac->list);
2442 tid->ac->sched = false;
2445 ath_tid_drain(sc, txq, tid);
2446 tid->state &= ~AGGR_ADDBA_COMPLETE;
2447 tid->state &= ~AGGR_CLEANUP;
2449 spin_unlock_bh(&txq->axq_lock);