2 * Copyright (c) 2008-2009 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.
18 #include "ar9003_mac.h"
20 #define BITS_PER_BYTE 8
21 #define OFDM_PLCP_BITS 22
22 #define HT_RC_2_MCS(_rc) ((_rc) & 0x1f)
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)
35 #define OFDM_SIFS_TIME 16
37 static u16 bits_per_symbol[][2] = {
39 { 26, 54 }, /* 0: BPSK */
40 { 52, 108 }, /* 1: QPSK 1/2 */
41 { 78, 162 }, /* 2: QPSK 3/4 */
42 { 104, 216 }, /* 3: 16-QAM 1/2 */
43 { 156, 324 }, /* 4: 16-QAM 3/4 */
44 { 208, 432 }, /* 5: 64-QAM 2/3 */
45 { 234, 486 }, /* 6: 64-QAM 3/4 */
46 { 260, 540 }, /* 7: 64-QAM 5/6 */
49 #define IS_HT_RATE(_rate) ((_rate) & 0x80)
51 static void ath_tx_send_ht_normal(struct ath_softc *sc, struct ath_txq *txq,
52 struct ath_atx_tid *tid,
53 struct list_head *bf_head);
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);
59 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf);
60 static int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf,
61 struct ath_tx_status *ts, int txok);
62 static void ath_tx_rc_status(struct ath_buf *bf, struct ath_tx_status *ts,
63 int nbad, int txok, bool update_rc);
64 static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
74 static int ath_max_4ms_framelen[4][32] = {
76 3212, 6432, 9648, 12864, 19300, 25736, 28952, 32172,
77 6424, 12852, 19280, 25708, 38568, 51424, 57852, 64280,
78 9628, 19260, 28896, 38528, 57792, 65532, 65532, 65532,
79 12828, 25656, 38488, 51320, 65532, 65532, 65532, 65532,
82 3572, 7144, 10720, 14296, 21444, 28596, 32172, 35744,
83 7140, 14284, 21428, 28568, 42856, 57144, 64288, 65532,
84 10700, 21408, 32112, 42816, 64228, 65532, 65532, 65532,
85 14256, 28516, 42780, 57040, 65532, 65532, 65532, 65532,
88 6680, 13360, 20044, 26724, 40092, 53456, 60140, 65532,
89 13348, 26700, 40052, 53400, 65532, 65532, 65532, 65532,
90 20004, 40008, 60016, 65532, 65532, 65532, 65532, 65532,
91 26644, 53292, 65532, 65532, 65532, 65532, 65532, 65532,
94 7420, 14844, 22272, 29696, 44544, 59396, 65532, 65532,
95 14832, 29668, 44504, 59340, 65532, 65532, 65532, 65532,
96 22232, 44464, 65532, 65532, 65532, 65532, 65532, 65532,
97 29616, 59232, 65532, 65532, 65532, 65532, 65532, 65532,
101 /*********************/
102 /* Aggregation logic */
103 /*********************/
105 static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
107 struct ath_atx_ac *ac = tid->ac;
116 list_add_tail(&tid->list, &ac->tid_q);
122 list_add_tail(&ac->list, &txq->axq_acq);
125 static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
127 struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum];
129 WARN_ON(!tid->paused);
131 spin_lock_bh(&txq->axq_lock);
134 if (list_empty(&tid->buf_q))
137 ath_tx_queue_tid(txq, tid);
138 ath_txq_schedule(sc, txq);
140 spin_unlock_bh(&txq->axq_lock);
143 static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
145 struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum];
147 struct list_head bf_head;
148 struct ath_tx_status ts;
150 INIT_LIST_HEAD(&bf_head);
152 memset(&ts, 0, sizeof(ts));
153 spin_lock_bh(&txq->axq_lock);
155 while (!list_empty(&tid->buf_q)) {
156 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
157 list_move_tail(&bf->list, &bf_head);
159 if (bf_isretried(bf)) {
160 ath_tx_update_baw(sc, tid, bf->bf_seqno);
161 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
163 ath_tx_send_ht_normal(sc, txq, tid, &bf_head);
167 spin_unlock_bh(&txq->axq_lock);
170 static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
175 index = ATH_BA_INDEX(tid->seq_start, seqno);
176 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
178 __clear_bit(cindex, tid->tx_buf);
180 while (tid->baw_head != tid->baw_tail && !test_bit(tid->baw_head, tid->tx_buf)) {
181 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
182 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
186 static void ath_tx_addto_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
191 if (bf_isretried(bf))
194 index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno);
195 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
196 __set_bit(cindex, tid->tx_buf);
198 if (index >= ((tid->baw_tail - tid->baw_head) &
199 (ATH_TID_MAX_BUFS - 1))) {
200 tid->baw_tail = cindex;
201 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
206 * TODO: For frame(s) that are in the retry state, we will reuse the
207 * sequence number(s) without setting the retry bit. The
208 * alternative is to give up on these and BAR the receiver's window
211 static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
212 struct ath_atx_tid *tid)
216 struct list_head bf_head;
217 struct ath_tx_status ts;
219 memset(&ts, 0, sizeof(ts));
220 INIT_LIST_HEAD(&bf_head);
223 if (list_empty(&tid->buf_q))
226 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
227 list_move_tail(&bf->list, &bf_head);
229 if (bf_isretried(bf))
230 ath_tx_update_baw(sc, tid, bf->bf_seqno);
232 spin_unlock(&txq->axq_lock);
233 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
234 spin_lock(&txq->axq_lock);
237 tid->seq_next = tid->seq_start;
238 tid->baw_tail = tid->baw_head;
241 static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
245 struct ieee80211_hdr *hdr;
247 bf->bf_state.bf_type |= BUF_RETRY;
249 TX_STAT_INC(txq->axq_qnum, a_retries);
252 hdr = (struct ieee80211_hdr *)skb->data;
253 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
256 static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
258 struct ath_buf *bf = NULL;
260 spin_lock_bh(&sc->tx.txbuflock);
262 if (unlikely(list_empty(&sc->tx.txbuf))) {
263 spin_unlock_bh(&sc->tx.txbuflock);
267 bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
270 spin_unlock_bh(&sc->tx.txbuflock);
275 static void ath_tx_return_buffer(struct ath_softc *sc, struct ath_buf *bf)
277 spin_lock_bh(&sc->tx.txbuflock);
278 list_add_tail(&bf->list, &sc->tx.txbuf);
279 spin_unlock_bh(&sc->tx.txbuflock);
282 static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
286 tbf = ath_tx_get_buffer(sc);
290 ATH_TXBUF_RESET(tbf);
292 tbf->aphy = bf->aphy;
293 tbf->bf_mpdu = bf->bf_mpdu;
294 tbf->bf_buf_addr = bf->bf_buf_addr;
295 memcpy(tbf->bf_desc, bf->bf_desc, sc->sc_ah->caps.tx_desc_len);
296 tbf->bf_state = bf->bf_state;
297 tbf->bf_dmacontext = bf->bf_dmacontext;
302 static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
303 struct ath_buf *bf, struct list_head *bf_q,
304 struct ath_tx_status *ts, int txok)
306 struct ath_node *an = NULL;
308 struct ieee80211_sta *sta;
309 struct ieee80211_hw *hw;
310 struct ieee80211_hdr *hdr;
311 struct ieee80211_tx_info *tx_info;
312 struct ath_atx_tid *tid = NULL;
313 struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
314 struct list_head bf_head, bf_pending;
315 u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0;
316 u32 ba[WME_BA_BMP_SIZE >> 5];
317 int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
318 bool rc_update = true;
319 struct ieee80211_tx_rate rates[4];
322 hdr = (struct ieee80211_hdr *)skb->data;
324 tx_info = IEEE80211_SKB_CB(skb);
327 memcpy(rates, tx_info->control.rates, sizeof(rates));
331 /* XXX: use ieee80211_find_sta! */
332 sta = ieee80211_find_sta_by_hw(hw, hdr->addr1);
336 INIT_LIST_HEAD(&bf_head);
338 bf_next = bf->bf_next;
340 bf->bf_state.bf_type |= BUF_XRETRY;
341 if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
342 !bf->bf_stale || bf_next != NULL)
343 list_move_tail(&bf->list, &bf_head);
345 ath_tx_rc_status(bf, ts, 0, 0, false);
346 ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
354 an = (struct ath_node *)sta->drv_priv;
355 tid = ATH_AN_2_TID(an, bf->bf_tidno);
358 * The hardware occasionally sends a tx status for the wrong TID.
359 * In this case, the BA status cannot be considered valid and all
360 * subframes need to be retransmitted
362 if (bf->bf_tidno != ts->tid)
365 isaggr = bf_isaggr(bf);
366 memset(ba, 0, WME_BA_BMP_SIZE >> 3);
368 if (isaggr && txok) {
369 if (ts->ts_flags & ATH9K_TX_BA) {
370 seq_st = ts->ts_seqnum;
371 memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
374 * AR5416 can become deaf/mute when BA
375 * issue happens. Chip needs to be reset.
376 * But AP code may have sychronization issues
377 * when perform internal reset in this routine.
378 * Only enable reset in STA mode for now.
380 if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION)
385 INIT_LIST_HEAD(&bf_pending);
386 INIT_LIST_HEAD(&bf_head);
388 nbad = ath_tx_num_badfrms(sc, bf, ts, txok);
390 txfail = txpending = 0;
391 bf_next = bf->bf_next;
394 tx_info = IEEE80211_SKB_CB(skb);
396 if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, bf->bf_seqno))) {
397 /* transmit completion, subframe is
398 * acked by block ack */
400 } else if (!isaggr && txok) {
401 /* transmit completion */
404 if (!(tid->state & AGGR_CLEANUP) &&
405 !bf_last->bf_tx_aborted) {
406 if (bf->bf_retries < ATH_MAX_SW_RETRIES) {
407 ath_tx_set_retry(sc, txq, bf);
410 bf->bf_state.bf_type |= BUF_XRETRY;
417 * cleanup in progress, just fail
418 * the un-acked sub-frames
424 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
427 * Make sure the last desc is reclaimed if it
428 * not a holding desc.
430 if (!bf_last->bf_stale)
431 list_move_tail(&bf->list, &bf_head);
433 INIT_LIST_HEAD(&bf_head);
435 BUG_ON(list_empty(bf_q));
436 list_move_tail(&bf->list, &bf_head);
439 if (!txpending || (tid->state & AGGR_CLEANUP)) {
441 * complete the acked-ones/xretried ones; update
444 spin_lock_bh(&txq->axq_lock);
445 ath_tx_update_baw(sc, tid, bf->bf_seqno);
446 spin_unlock_bh(&txq->axq_lock);
448 if (rc_update && (acked_cnt == 1 || txfail_cnt == 1)) {
449 memcpy(tx_info->control.rates, rates, sizeof(rates));
450 ath_tx_rc_status(bf, ts, nbad, txok, true);
453 ath_tx_rc_status(bf, ts, nbad, txok, false);
456 ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
459 /* retry the un-acked ones */
460 if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)) {
461 if (bf->bf_next == NULL && bf_last->bf_stale) {
464 tbf = ath_clone_txbuf(sc, bf_last);
466 * Update tx baw and complete the
467 * frame with failed status if we
471 spin_lock_bh(&txq->axq_lock);
472 ath_tx_update_baw(sc, tid,
474 spin_unlock_bh(&txq->axq_lock);
476 bf->bf_state.bf_type |=
478 ath_tx_rc_status(bf, ts, nbad,
480 ath_tx_complete_buf(sc, bf, txq,
486 ath9k_hw_cleartxdesc(sc->sc_ah,
488 list_add_tail(&tbf->list, &bf_head);
491 * Clear descriptor status words for
494 ath9k_hw_cleartxdesc(sc->sc_ah,
500 * Put this buffer to the temporary pending
501 * queue to retain ordering
503 list_splice_tail_init(&bf_head, &bf_pending);
509 /* prepend un-acked frames to the beginning of the pending frame queue */
510 if (!list_empty(&bf_pending)) {
511 spin_lock_bh(&txq->axq_lock);
512 list_splice(&bf_pending, &tid->buf_q);
513 ath_tx_queue_tid(txq, tid);
514 spin_unlock_bh(&txq->axq_lock);
517 if (tid->state & AGGR_CLEANUP) {
518 ath_tx_flush_tid(sc, tid);
520 if (tid->baw_head == tid->baw_tail) {
521 tid->state &= ~AGGR_ADDBA_COMPLETE;
522 tid->state &= ~AGGR_CLEANUP;
529 ath_reset(sc, false);
532 static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
533 struct ath_atx_tid *tid)
536 struct ieee80211_tx_info *tx_info;
537 struct ieee80211_tx_rate *rates;
538 u32 max_4ms_framelen, frmlen;
539 u16 aggr_limit, legacy = 0;
543 tx_info = IEEE80211_SKB_CB(skb);
544 rates = tx_info->control.rates;
547 * Find the lowest frame length among the rate series that will have a
548 * 4ms transmit duration.
549 * TODO - TXOP limit needs to be considered.
551 max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
553 for (i = 0; i < 4; i++) {
554 if (rates[i].count) {
556 if (!(rates[i].flags & IEEE80211_TX_RC_MCS)) {
561 if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
566 if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
569 frmlen = ath_max_4ms_framelen[modeidx][rates[i].idx];
570 max_4ms_framelen = min(max_4ms_framelen, frmlen);
575 * limit aggregate size by the minimum rate if rate selected is
576 * not a probe rate, if rate selected is a probe rate then
577 * avoid aggregation of this packet.
579 if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy)
582 if (sc->sc_flags & SC_OP_BT_PRIORITY_DETECTED)
583 aggr_limit = min((max_4ms_framelen * 3) / 8,
584 (u32)ATH_AMPDU_LIMIT_MAX);
586 aggr_limit = min(max_4ms_framelen,
587 (u32)ATH_AMPDU_LIMIT_MAX);
590 * h/w can accept aggregates upto 16 bit lengths (65535).
591 * The IE, however can hold upto 65536, which shows up here
592 * as zero. Ignore 65536 since we are constrained by hw.
594 if (tid->an->maxampdu)
595 aggr_limit = min(aggr_limit, tid->an->maxampdu);
601 * Returns the number of delimiters to be added to
602 * meet the minimum required mpdudensity.
604 static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
605 struct ath_buf *bf, u16 frmlen)
607 struct sk_buff *skb = bf->bf_mpdu;
608 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
609 u32 nsymbits, nsymbols;
612 int width, streams, half_gi, ndelim, mindelim;
614 /* Select standard number of delimiters based on frame length alone */
615 ndelim = ATH_AGGR_GET_NDELIM(frmlen);
618 * If encryption enabled, hardware requires some more padding between
620 * TODO - this could be improved to be dependent on the rate.
621 * The hardware can keep up at lower rates, but not higher rates
623 if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR)
624 ndelim += ATH_AGGR_ENCRYPTDELIM;
627 * Convert desired mpdu density from microeconds to bytes based
628 * on highest rate in rate series (i.e. first rate) to determine
629 * required minimum length for subframe. Take into account
630 * whether high rate is 20 or 40Mhz and half or full GI.
632 * If there is no mpdu density restriction, no further calculation
636 if (tid->an->mpdudensity == 0)
639 rix = tx_info->control.rates[0].idx;
640 flags = tx_info->control.rates[0].flags;
641 width = (flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? 1 : 0;
642 half_gi = (flags & IEEE80211_TX_RC_SHORT_GI) ? 1 : 0;
645 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(tid->an->mpdudensity);
647 nsymbols = NUM_SYMBOLS_PER_USEC(tid->an->mpdudensity);
652 streams = HT_RC_2_STREAMS(rix);
653 nsymbits = bits_per_symbol[rix % 8][width] * streams;
654 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
656 if (frmlen < minlen) {
657 mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ;
658 ndelim = max(mindelim, ndelim);
664 static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
666 struct ath_atx_tid *tid,
667 struct list_head *bf_q)
669 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
670 struct ath_buf *bf, *bf_first, *bf_prev = NULL;
671 int rl = 0, nframes = 0, ndelim, prev_al = 0;
672 u16 aggr_limit = 0, al = 0, bpad = 0,
673 al_delta, h_baw = tid->baw_size / 2;
674 enum ATH_AGGR_STATUS status = ATH_AGGR_DONE;
676 bf_first = list_first_entry(&tid->buf_q, struct ath_buf, list);
679 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
681 /* do not step over block-ack window */
682 if (!BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno)) {
683 status = ATH_AGGR_BAW_CLOSED;
688 aggr_limit = ath_lookup_rate(sc, bf, tid);
692 /* do not exceed aggregation limit */
693 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_frmlen;
696 (aggr_limit < (al + bpad + al_delta + prev_al))) {
697 status = ATH_AGGR_LIMITED;
701 /* do not exceed subframe limit */
702 if (nframes >= min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) {
703 status = ATH_AGGR_LIMITED;
708 /* add padding for previous frame to aggregation length */
709 al += bpad + al_delta;
712 * Get the delimiters needed to meet the MPDU
713 * density for this node.
715 ndelim = ath_compute_num_delims(sc, tid, bf_first, bf->bf_frmlen);
716 bpad = PADBYTES(al_delta) + (ndelim << 2);
719 ath9k_hw_set_desc_link(sc->sc_ah, bf->bf_desc, 0);
721 /* link buffers of this frame to the aggregate */
722 ath_tx_addto_baw(sc, tid, bf);
723 ath9k_hw_set11n_aggr_middle(sc->sc_ah, bf->bf_desc, ndelim);
724 list_move_tail(&bf->list, bf_q);
726 bf_prev->bf_next = bf;
727 ath9k_hw_set_desc_link(sc->sc_ah, bf_prev->bf_desc,
732 } while (!list_empty(&tid->buf_q));
734 bf_first->bf_al = al;
735 bf_first->bf_nframes = nframes;
741 static void ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
742 struct ath_atx_tid *tid)
745 enum ATH_AGGR_STATUS status;
746 struct list_head bf_q;
749 if (list_empty(&tid->buf_q))
752 INIT_LIST_HEAD(&bf_q);
754 status = ath_tx_form_aggr(sc, txq, tid, &bf_q);
757 * no frames picked up to be aggregated;
758 * block-ack window is not open.
760 if (list_empty(&bf_q))
763 bf = list_first_entry(&bf_q, struct ath_buf, list);
764 bf->bf_lastbf = list_entry(bf_q.prev, struct ath_buf, list);
766 /* if only one frame, send as non-aggregate */
767 if (bf->bf_nframes == 1) {
768 bf->bf_state.bf_type &= ~BUF_AGGR;
769 ath9k_hw_clr11n_aggr(sc->sc_ah, bf->bf_desc);
770 ath_buf_set_rate(sc, bf);
771 ath_tx_txqaddbuf(sc, txq, &bf_q);
775 /* setup first desc of aggregate */
776 bf->bf_state.bf_type |= BUF_AGGR;
777 ath_buf_set_rate(sc, bf);
778 ath9k_hw_set11n_aggr_first(sc->sc_ah, bf->bf_desc, bf->bf_al);
780 /* anchor last desc of aggregate */
781 ath9k_hw_set11n_aggr_last(sc->sc_ah, bf->bf_lastbf->bf_desc);
783 ath_tx_txqaddbuf(sc, txq, &bf_q);
784 TX_STAT_INC(txq->axq_qnum, a_aggr);
786 } while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
787 status != ATH_AGGR_BAW_CLOSED);
790 int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
793 struct ath_atx_tid *txtid;
796 an = (struct ath_node *)sta->drv_priv;
797 txtid = ATH_AN_2_TID(an, tid);
799 if (txtid->state & (AGGR_CLEANUP | AGGR_ADDBA_COMPLETE))
802 txtid->state |= AGGR_ADDBA_PROGRESS;
803 txtid->paused = true;
804 *ssn = txtid->seq_start;
809 void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
811 struct ath_node *an = (struct ath_node *)sta->drv_priv;
812 struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
813 struct ath_txq *txq = &sc->tx.txq[txtid->ac->qnum];
815 if (txtid->state & AGGR_CLEANUP)
818 if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
819 txtid->state &= ~AGGR_ADDBA_PROGRESS;
823 spin_lock_bh(&txq->axq_lock);
824 txtid->paused = true;
827 * If frames are still being transmitted for this TID, they will be
828 * cleaned up during tx completion. To prevent race conditions, this
829 * TID can only be reused after all in-progress subframes have been
832 if (txtid->baw_head != txtid->baw_tail)
833 txtid->state |= AGGR_CLEANUP;
835 txtid->state &= ~AGGR_ADDBA_COMPLETE;
836 spin_unlock_bh(&txq->axq_lock);
838 ath_tx_flush_tid(sc, txtid);
841 void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
843 struct ath_atx_tid *txtid;
846 an = (struct ath_node *)sta->drv_priv;
848 if (sc->sc_flags & SC_OP_TXAGGR) {
849 txtid = ATH_AN_2_TID(an, tid);
851 IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
852 txtid->state |= AGGR_ADDBA_COMPLETE;
853 txtid->state &= ~AGGR_ADDBA_PROGRESS;
854 ath_tx_resume_tid(sc, txtid);
858 /********************/
859 /* Queue Management */
860 /********************/
862 static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
865 struct ath_atx_ac *ac, *ac_tmp;
866 struct ath_atx_tid *tid, *tid_tmp;
868 list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
871 list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) {
872 list_del(&tid->list);
874 ath_tid_drain(sc, txq, tid);
879 struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
881 struct ath_hw *ah = sc->sc_ah;
882 struct ath_common *common = ath9k_hw_common(ah);
883 struct ath9k_tx_queue_info qi;
886 memset(&qi, 0, sizeof(qi));
887 qi.tqi_subtype = subtype;
888 qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
889 qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
890 qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
891 qi.tqi_physCompBuf = 0;
894 * Enable interrupts only for EOL and DESC conditions.
895 * We mark tx descriptors to receive a DESC interrupt
896 * when a tx queue gets deep; otherwise waiting for the
897 * EOL to reap descriptors. Note that this is done to
898 * reduce interrupt load and this only defers reaping
899 * descriptors, never transmitting frames. Aside from
900 * reducing interrupts this also permits more concurrency.
901 * The only potential downside is if the tx queue backs
902 * up in which case the top half of the kernel may backup
903 * due to a lack of tx descriptors.
905 * The UAPSD queue is an exception, since we take a desc-
906 * based intr on the EOSP frames.
908 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
909 qi.tqi_qflags = TXQ_FLAG_TXOKINT_ENABLE |
910 TXQ_FLAG_TXERRINT_ENABLE;
912 if (qtype == ATH9K_TX_QUEUE_UAPSD)
913 qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE;
915 qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |
916 TXQ_FLAG_TXDESCINT_ENABLE;
918 qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi);
921 * NB: don't print a message, this happens
922 * normally on parts with too few tx queues
926 if (qnum >= ARRAY_SIZE(sc->tx.txq)) {
927 ath_print(common, ATH_DBG_FATAL,
928 "qnum %u out of range, max %u!\n",
929 qnum, (unsigned int)ARRAY_SIZE(sc->tx.txq));
930 ath9k_hw_releasetxqueue(ah, qnum);
933 if (!ATH_TXQ_SETUP(sc, qnum)) {
934 struct ath_txq *txq = &sc->tx.txq[qnum];
936 txq->axq_class = subtype;
937 txq->axq_qnum = qnum;
938 txq->axq_link = NULL;
939 INIT_LIST_HEAD(&txq->axq_q);
940 INIT_LIST_HEAD(&txq->axq_acq);
941 spin_lock_init(&txq->axq_lock);
943 txq->axq_tx_inprogress = false;
944 sc->tx.txqsetup |= 1<<qnum;
946 txq->txq_headidx = txq->txq_tailidx = 0;
947 for (i = 0; i < ATH_TXFIFO_DEPTH; i++)
948 INIT_LIST_HEAD(&txq->txq_fifo[i]);
949 INIT_LIST_HEAD(&txq->txq_fifo_pending);
951 return &sc->tx.txq[qnum];
954 int ath_txq_update(struct ath_softc *sc, int qnum,
955 struct ath9k_tx_queue_info *qinfo)
957 struct ath_hw *ah = sc->sc_ah;
959 struct ath9k_tx_queue_info qi;
961 if (qnum == sc->beacon.beaconq) {
963 * XXX: for beacon queue, we just save the parameter.
964 * It will be picked up by ath_beaconq_config when
967 sc->beacon.beacon_qi = *qinfo;
971 BUG_ON(sc->tx.txq[qnum].axq_qnum != qnum);
973 ath9k_hw_get_txq_props(ah, qnum, &qi);
974 qi.tqi_aifs = qinfo->tqi_aifs;
975 qi.tqi_cwmin = qinfo->tqi_cwmin;
976 qi.tqi_cwmax = qinfo->tqi_cwmax;
977 qi.tqi_burstTime = qinfo->tqi_burstTime;
978 qi.tqi_readyTime = qinfo->tqi_readyTime;
980 if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
981 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
982 "Unable to update hardware queue %u!\n", qnum);
985 ath9k_hw_resettxqueue(ah, qnum);
991 int ath_cabq_update(struct ath_softc *sc)
993 struct ath9k_tx_queue_info qi;
994 int qnum = sc->beacon.cabq->axq_qnum;
996 ath9k_hw_get_txq_props(sc->sc_ah, qnum, &qi);
998 * Ensure the readytime % is within the bounds.
1000 if (sc->config.cabqReadytime < ATH9K_READY_TIME_LO_BOUND)
1001 sc->config.cabqReadytime = ATH9K_READY_TIME_LO_BOUND;
1002 else if (sc->config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND)
1003 sc->config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND;
1005 qi.tqi_readyTime = (sc->beacon_interval *
1006 sc->config.cabqReadytime) / 100;
1007 ath_txq_update(sc, qnum, &qi);
1013 * Drain a given TX queue (could be Beacon or Data)
1015 * This assumes output has been stopped and
1016 * we do not need to block ath_tx_tasklet.
1018 void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
1020 struct ath_buf *bf, *lastbf;
1021 struct list_head bf_head;
1022 struct ath_tx_status ts;
1024 memset(&ts, 0, sizeof(ts));
1025 INIT_LIST_HEAD(&bf_head);
1028 spin_lock_bh(&txq->axq_lock);
1030 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1031 if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
1032 txq->txq_headidx = txq->txq_tailidx = 0;
1033 spin_unlock_bh(&txq->axq_lock);
1036 bf = list_first_entry(&txq->txq_fifo[txq->txq_tailidx],
1037 struct ath_buf, list);
1040 if (list_empty(&txq->axq_q)) {
1041 txq->axq_link = NULL;
1042 spin_unlock_bh(&txq->axq_lock);
1045 bf = list_first_entry(&txq->axq_q, struct ath_buf,
1049 list_del(&bf->list);
1050 spin_unlock_bh(&txq->axq_lock);
1052 ath_tx_return_buffer(sc, bf);
1057 lastbf = bf->bf_lastbf;
1059 lastbf->bf_tx_aborted = true;
1061 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1062 list_cut_position(&bf_head,
1063 &txq->txq_fifo[txq->txq_tailidx],
1065 INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
1067 /* remove ath_buf's of the same mpdu from txq */
1068 list_cut_position(&bf_head, &txq->axq_q, &lastbf->list);
1073 spin_unlock_bh(&txq->axq_lock);
1076 ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, 0);
1078 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 0);
1081 spin_lock_bh(&txq->axq_lock);
1082 txq->axq_tx_inprogress = false;
1083 spin_unlock_bh(&txq->axq_lock);
1085 /* flush any pending frames if aggregation is enabled */
1086 if (sc->sc_flags & SC_OP_TXAGGR) {
1088 spin_lock_bh(&txq->axq_lock);
1089 ath_txq_drain_pending_buffers(sc, txq);
1090 spin_unlock_bh(&txq->axq_lock);
1094 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1095 spin_lock_bh(&txq->axq_lock);
1096 while (!list_empty(&txq->txq_fifo_pending)) {
1097 bf = list_first_entry(&txq->txq_fifo_pending,
1098 struct ath_buf, list);
1099 list_cut_position(&bf_head,
1100 &txq->txq_fifo_pending,
1101 &bf->bf_lastbf->list);
1102 spin_unlock_bh(&txq->axq_lock);
1105 ath_tx_complete_aggr(sc, txq, bf, &bf_head,
1108 ath_tx_complete_buf(sc, bf, txq, &bf_head,
1110 spin_lock_bh(&txq->axq_lock);
1112 spin_unlock_bh(&txq->axq_lock);
1116 void ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
1118 struct ath_hw *ah = sc->sc_ah;
1119 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1120 struct ath_txq *txq;
1123 if (sc->sc_flags & SC_OP_INVALID)
1126 /* Stop beacon queue */
1127 ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq);
1129 /* Stop data queues */
1130 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1131 if (ATH_TXQ_SETUP(sc, i)) {
1132 txq = &sc->tx.txq[i];
1133 ath9k_hw_stoptxdma(ah, txq->axq_qnum);
1134 npend += ath9k_hw_numtxpending(ah, txq->axq_qnum);
1141 ath_print(common, ATH_DBG_FATAL,
1142 "Failed to stop TX DMA. Resetting hardware!\n");
1144 spin_lock_bh(&sc->sc_resetlock);
1145 r = ath9k_hw_reset(ah, sc->sc_ah->curchan, ah->caldata, false);
1147 ath_print(common, ATH_DBG_FATAL,
1148 "Unable to reset hardware; reset status %d\n",
1150 spin_unlock_bh(&sc->sc_resetlock);
1153 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1154 if (ATH_TXQ_SETUP(sc, i))
1155 ath_draintxq(sc, &sc->tx.txq[i], retry_tx);
1159 void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
1161 ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum);
1162 sc->tx.txqsetup &= ~(1<<txq->axq_qnum);
1165 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
1167 struct ath_atx_ac *ac;
1168 struct ath_atx_tid *tid;
1170 if (list_empty(&txq->axq_acq))
1173 ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
1174 list_del(&ac->list);
1178 if (list_empty(&ac->tid_q))
1181 tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list);
1182 list_del(&tid->list);
1188 ath_tx_sched_aggr(sc, txq, tid);
1191 * add tid to round-robin queue if more frames
1192 * are pending for the tid
1194 if (!list_empty(&tid->buf_q))
1195 ath_tx_queue_tid(txq, tid);
1198 } while (!list_empty(&ac->tid_q));
1200 if (!list_empty(&ac->tid_q)) {
1203 list_add_tail(&ac->list, &txq->axq_acq);
1208 int ath_tx_setup(struct ath_softc *sc, int haltype)
1210 struct ath_txq *txq;
1212 if (haltype >= ARRAY_SIZE(sc->tx.hwq_map)) {
1213 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
1214 "HAL AC %u out of range, max %zu!\n",
1215 haltype, ARRAY_SIZE(sc->tx.hwq_map));
1218 txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype);
1220 sc->tx.hwq_map[haltype] = txq->axq_qnum;
1231 * Insert a chain of ath_buf (descriptors) on a txq and
1232 * assume the descriptors are already chained together by caller.
1234 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
1235 struct list_head *head)
1237 struct ath_hw *ah = sc->sc_ah;
1238 struct ath_common *common = ath9k_hw_common(ah);
1242 * Insert the frame on the outbound list and
1243 * pass it on to the hardware.
1246 if (list_empty(head))
1249 bf = list_first_entry(head, struct ath_buf, list);
1251 ath_print(common, ATH_DBG_QUEUE,
1252 "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth);
1254 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
1255 if (txq->axq_depth >= ATH_TXFIFO_DEPTH) {
1256 list_splice_tail_init(head, &txq->txq_fifo_pending);
1259 if (!list_empty(&txq->txq_fifo[txq->txq_headidx]))
1260 ath_print(common, ATH_DBG_XMIT,
1261 "Initializing tx fifo %d which "
1264 INIT_LIST_HEAD(&txq->txq_fifo[txq->txq_headidx]);
1265 list_splice_init(head, &txq->txq_fifo[txq->txq_headidx]);
1266 INCR(txq->txq_headidx, ATH_TXFIFO_DEPTH);
1267 ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
1268 ath_print(common, ATH_DBG_XMIT,
1269 "TXDP[%u] = %llx (%p)\n",
1270 txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
1272 list_splice_tail_init(head, &txq->axq_q);
1274 if (txq->axq_link == NULL) {
1275 ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
1276 ath_print(common, ATH_DBG_XMIT,
1277 "TXDP[%u] = %llx (%p)\n",
1278 txq->axq_qnum, ito64(bf->bf_daddr),
1281 *txq->axq_link = bf->bf_daddr;
1282 ath_print(common, ATH_DBG_XMIT,
1283 "link[%u] (%p)=%llx (%p)\n",
1284 txq->axq_qnum, txq->axq_link,
1285 ito64(bf->bf_daddr), bf->bf_desc);
1287 ath9k_hw_get_desc_link(ah, bf->bf_lastbf->bf_desc,
1289 ath9k_hw_txstart(ah, txq->axq_qnum);
1294 static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
1295 struct list_head *bf_head,
1296 struct ath_tx_control *txctl)
1300 bf = list_first_entry(bf_head, struct ath_buf, list);
1301 bf->bf_state.bf_type |= BUF_AMPDU;
1302 TX_STAT_INC(txctl->txq->axq_qnum, a_queued);
1305 * Do not queue to h/w when any of the following conditions is true:
1306 * - there are pending frames in software queue
1307 * - the TID is currently paused for ADDBA/BAR request
1308 * - seqno is not within block-ack window
1309 * - h/w queue depth exceeds low water mark
1311 if (!list_empty(&tid->buf_q) || tid->paused ||
1312 !BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno) ||
1313 txctl->txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) {
1315 * Add this frame to software queue for scheduling later
1318 list_move_tail(&bf->list, &tid->buf_q);
1319 ath_tx_queue_tid(txctl->txq, tid);
1323 /* Add sub-frame to BAW */
1324 ath_tx_addto_baw(sc, tid, bf);
1326 /* Queue to h/w without aggregation */
1329 ath_buf_set_rate(sc, bf);
1330 ath_tx_txqaddbuf(sc, txctl->txq, bf_head);
1333 static void ath_tx_send_ht_normal(struct ath_softc *sc, struct ath_txq *txq,
1334 struct ath_atx_tid *tid,
1335 struct list_head *bf_head)
1339 bf = list_first_entry(bf_head, struct ath_buf, list);
1340 bf->bf_state.bf_type &= ~BUF_AMPDU;
1342 /* update starting sequence number for subsequent ADDBA request */
1343 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
1347 ath_buf_set_rate(sc, bf);
1348 ath_tx_txqaddbuf(sc, txq, bf_head);
1349 TX_STAT_INC(txq->axq_qnum, queued);
1352 static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
1353 struct list_head *bf_head)
1357 bf = list_first_entry(bf_head, struct ath_buf, list);
1361 ath_buf_set_rate(sc, bf);
1362 ath_tx_txqaddbuf(sc, txq, bf_head);
1363 TX_STAT_INC(txq->axq_qnum, queued);
1366 static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb)
1368 struct ieee80211_hdr *hdr;
1369 enum ath9k_pkt_type htype;
1372 hdr = (struct ieee80211_hdr *)skb->data;
1373 fc = hdr->frame_control;
1375 if (ieee80211_is_beacon(fc))
1376 htype = ATH9K_PKT_TYPE_BEACON;
1377 else if (ieee80211_is_probe_resp(fc))
1378 htype = ATH9K_PKT_TYPE_PROBE_RESP;
1379 else if (ieee80211_is_atim(fc))
1380 htype = ATH9K_PKT_TYPE_ATIM;
1381 else if (ieee80211_is_pspoll(fc))
1382 htype = ATH9K_PKT_TYPE_PSPOLL;
1384 htype = ATH9K_PKT_TYPE_NORMAL;
1389 static void assign_aggr_tid_seqno(struct sk_buff *skb,
1392 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1393 struct ieee80211_hdr *hdr;
1394 struct ath_node *an;
1395 struct ath_atx_tid *tid;
1399 if (!tx_info->control.sta)
1402 an = (struct ath_node *)tx_info->control.sta->drv_priv;
1403 hdr = (struct ieee80211_hdr *)skb->data;
1404 fc = hdr->frame_control;
1406 if (ieee80211_is_data_qos(fc)) {
1407 qc = ieee80211_get_qos_ctl(hdr);
1408 bf->bf_tidno = qc[0] & 0xf;
1412 * For HT capable stations, we save tidno for later use.
1413 * We also override seqno set by upper layer with the one
1414 * in tx aggregation state.
1416 tid = ATH_AN_2_TID(an, bf->bf_tidno);
1417 hdr->seq_ctrl = cpu_to_le16(tid->seq_next << IEEE80211_SEQ_SEQ_SHIFT);
1418 bf->bf_seqno = tid->seq_next;
1419 INCR(tid->seq_next, IEEE80211_SEQ_MAX);
1422 static int setup_tx_flags(struct sk_buff *skb, bool use_ldpc)
1424 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1427 flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
1428 flags |= ATH9K_TXDESC_INTREQ;
1430 if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
1431 flags |= ATH9K_TXDESC_NOACK;
1434 flags |= ATH9K_TXDESC_LDPC;
1441 * pktlen - total bytes (delims + data + fcs + pads + pad delims)
1442 * width - 0 for 20 MHz, 1 for 40 MHz
1443 * half_gi - to use 4us v/s 3.6 us for symbol time
1445 static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, struct ath_buf *bf,
1446 int width, int half_gi, bool shortPreamble)
1448 u32 nbits, nsymbits, duration, nsymbols;
1449 int streams, pktlen;
1451 pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen;
1453 /* find number of symbols: PLCP + data */
1454 streams = HT_RC_2_STREAMS(rix);
1455 nbits = (pktlen << 3) + OFDM_PLCP_BITS;
1456 nsymbits = bits_per_symbol[rix % 8][width] * streams;
1457 nsymbols = (nbits + nsymbits - 1) / nsymbits;
1460 duration = SYMBOL_TIME(nsymbols);
1462 duration = SYMBOL_TIME_HALFGI(nsymbols);
1464 /* addup duration for legacy/ht training and signal fields */
1465 duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
1470 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
1472 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1473 struct ath9k_11n_rate_series series[4];
1474 struct sk_buff *skb;
1475 struct ieee80211_tx_info *tx_info;
1476 struct ieee80211_tx_rate *rates;
1477 const struct ieee80211_rate *rate;
1478 struct ieee80211_hdr *hdr;
1480 u8 rix = 0, ctsrate = 0;
1483 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
1486 tx_info = IEEE80211_SKB_CB(skb);
1487 rates = tx_info->control.rates;
1488 hdr = (struct ieee80211_hdr *)skb->data;
1489 is_pspoll = ieee80211_is_pspoll(hdr->frame_control);
1492 * We check if Short Preamble is needed for the CTS rate by
1493 * checking the BSS's global flag.
1494 * But for the rate series, IEEE80211_TX_RC_USE_SHORT_PREAMBLE is used.
1496 rate = ieee80211_get_rts_cts_rate(sc->hw, tx_info);
1497 ctsrate = rate->hw_value;
1498 if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
1499 ctsrate |= rate->hw_value_short;
1501 for (i = 0; i < 4; i++) {
1502 bool is_40, is_sgi, is_sp;
1505 if (!rates[i].count || (rates[i].idx < 0))
1509 series[i].Tries = rates[i].count;
1510 series[i].ChSel = common->tx_chainmask;
1512 if ((sc->config.ath_aggr_prot && bf_isaggr(bf)) ||
1513 (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS)) {
1514 series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
1515 flags |= ATH9K_TXDESC_RTSENA;
1516 } else if (rates[i].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
1517 series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
1518 flags |= ATH9K_TXDESC_CTSENA;
1521 if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1522 series[i].RateFlags |= ATH9K_RATESERIES_2040;
1523 if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
1524 series[i].RateFlags |= ATH9K_RATESERIES_HALFGI;
1526 is_sgi = !!(rates[i].flags & IEEE80211_TX_RC_SHORT_GI);
1527 is_40 = !!(rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH);
1528 is_sp = !!(rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
1530 if (rates[i].flags & IEEE80211_TX_RC_MCS) {
1532 series[i].Rate = rix | 0x80;
1533 series[i].PktDuration = ath_pkt_duration(sc, rix, bf,
1534 is_40, is_sgi, is_sp);
1535 if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
1536 series[i].RateFlags |= ATH9K_RATESERIES_STBC;
1541 if ((tx_info->band == IEEE80211_BAND_2GHZ) &&
1542 !(rate->flags & IEEE80211_RATE_ERP_G))
1543 phy = WLAN_RC_PHY_CCK;
1545 phy = WLAN_RC_PHY_OFDM;
1547 rate = &sc->sbands[tx_info->band].bitrates[rates[i].idx];
1548 series[i].Rate = rate->hw_value;
1549 if (rate->hw_value_short) {
1550 if (rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
1551 series[i].Rate |= rate->hw_value_short;
1556 series[i].PktDuration = ath9k_hw_computetxtime(sc->sc_ah,
1557 phy, rate->bitrate * 100, bf->bf_frmlen, rix, is_sp);
1560 /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
1561 if (bf_isaggr(bf) && (bf->bf_al > sc->sc_ah->caps.rts_aggr_limit))
1562 flags &= ~ATH9K_TXDESC_RTSENA;
1564 /* ATH9K_TXDESC_RTSENA and ATH9K_TXDESC_CTSENA are mutually exclusive. */
1565 if (flags & ATH9K_TXDESC_RTSENA)
1566 flags &= ~ATH9K_TXDESC_CTSENA;
1568 /* set dur_update_en for l-sig computation except for PS-Poll frames */
1569 ath9k_hw_set11n_ratescenario(sc->sc_ah, bf->bf_desc,
1570 bf->bf_lastbf->bf_desc,
1571 !is_pspoll, ctsrate,
1572 0, series, 4, flags);
1574 if (sc->config.ath_aggr_prot && flags)
1575 ath9k_hw_set11n_burstduration(sc->sc_ah, bf->bf_desc, 8192);
1578 static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
1579 struct sk_buff *skb,
1580 struct ath_tx_control *txctl)
1582 struct ath_wiphy *aphy = hw->priv;
1583 struct ath_softc *sc = aphy->sc;
1584 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1585 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1588 int padpos, padsize;
1589 bool use_ldpc = false;
1591 tx_info->pad[0] = 0;
1592 switch (txctl->frame_type) {
1593 case ATH9K_IFT_NOT_INTERNAL:
1595 case ATH9K_IFT_PAUSE:
1596 tx_info->pad[0] |= ATH_TX_INFO_FRAME_TYPE_PAUSE;
1598 case ATH9K_IFT_UNPAUSE:
1599 tx_info->pad[0] |= ATH_TX_INFO_FRAME_TYPE_INTERNAL;
1602 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1603 fc = hdr->frame_control;
1605 ATH_TXBUF_RESET(bf);
1608 bf->bf_frmlen = skb->len + FCS_LEN;
1609 /* Remove the padding size from bf_frmlen, if any */
1610 padpos = ath9k_cmn_padpos(hdr->frame_control);
1611 padsize = padpos & 3;
1612 if (padsize && skb->len>padpos+padsize) {
1613 bf->bf_frmlen -= padsize;
1616 if (!txctl->paprd && conf_is_ht(&hw->conf)) {
1617 bf->bf_state.bf_type |= BUF_HT;
1618 if (tx_info->flags & IEEE80211_TX_CTL_LDPC)
1622 bf->bf_state.bfs_paprd = txctl->paprd;
1624 bf->bf_state.bfs_paprd_timestamp = jiffies;
1625 bf->bf_flags = setup_tx_flags(skb, use_ldpc);
1627 bf->bf_keytype = ath9k_cmn_get_hw_crypto_keytype(skb);
1628 if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {
1629 bf->bf_frmlen += tx_info->control.hw_key->icv_len;
1630 bf->bf_keyix = tx_info->control.hw_key->hw_key_idx;
1632 bf->bf_keyix = ATH9K_TXKEYIX_INVALID;
1635 if (ieee80211_is_data_qos(fc) && bf_isht(bf) &&
1636 (sc->sc_flags & SC_OP_TXAGGR))
1637 assign_aggr_tid_seqno(skb, bf);
1641 bf->bf_dmacontext = dma_map_single(sc->dev, skb->data,
1642 skb->len, DMA_TO_DEVICE);
1643 if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) {
1645 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
1646 "dma_mapping_error() on TX\n");
1650 bf->bf_buf_addr = bf->bf_dmacontext;
1652 /* tag if this is a nullfunc frame to enable PS when AP acks it */
1653 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc)) {
1654 bf->bf_isnullfunc = true;
1655 sc->ps_flags &= ~PS_NULLFUNC_COMPLETED;
1657 bf->bf_isnullfunc = false;
1659 bf->bf_tx_aborted = false;
1664 /* FIXME: tx power */
1665 static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
1666 struct ath_tx_control *txctl)
1668 struct sk_buff *skb = bf->bf_mpdu;
1669 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1670 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1671 struct ath_node *an = NULL;
1672 struct list_head bf_head;
1673 struct ath_desc *ds;
1674 struct ath_atx_tid *tid;
1675 struct ath_hw *ah = sc->sc_ah;
1679 frm_type = get_hw_packet_type(skb);
1680 fc = hdr->frame_control;
1682 INIT_LIST_HEAD(&bf_head);
1683 list_add_tail(&bf->list, &bf_head);
1686 ath9k_hw_set_desc_link(ah, ds, 0);
1688 ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER,
1689 bf->bf_keyix, bf->bf_keytype, bf->bf_flags);
1691 ath9k_hw_filltxdesc(ah, ds,
1692 skb->len, /* segment length */
1693 true, /* first segment */
1694 true, /* last segment */
1695 ds, /* first descriptor */
1697 txctl->txq->axq_qnum);
1699 if (bf->bf_state.bfs_paprd)
1700 ar9003_hw_set_paprd_txdesc(ah, ds, bf->bf_state.bfs_paprd);
1702 spin_lock_bh(&txctl->txq->axq_lock);
1704 if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) &&
1705 tx_info->control.sta) {
1706 an = (struct ath_node *)tx_info->control.sta->drv_priv;
1707 tid = ATH_AN_2_TID(an, bf->bf_tidno);
1709 if (!ieee80211_is_data_qos(fc)) {
1710 ath_tx_send_normal(sc, txctl->txq, &bf_head);
1714 if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
1716 * Try aggregation if it's a unicast data frame
1717 * and the destination is HT capable.
1719 ath_tx_send_ampdu(sc, tid, &bf_head, txctl);
1722 * Send this frame as regular when ADDBA
1723 * exchange is neither complete nor pending.
1725 ath_tx_send_ht_normal(sc, txctl->txq,
1729 ath_tx_send_normal(sc, txctl->txq, &bf_head);
1733 spin_unlock_bh(&txctl->txq->axq_lock);
1736 /* Upon failure caller should free skb */
1737 int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
1738 struct ath_tx_control *txctl)
1740 struct ath_wiphy *aphy = hw->priv;
1741 struct ath_softc *sc = aphy->sc;
1742 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1743 struct ath_txq *txq = txctl->txq;
1747 bf = ath_tx_get_buffer(sc);
1749 ath_print(common, ATH_DBG_XMIT, "TX buffers are full\n");
1753 r = ath_tx_setup_buffer(hw, bf, skb, txctl);
1755 ath_print(common, ATH_DBG_FATAL, "TX mem alloc failure\n");
1757 /* upon ath_tx_processq() this TX queue will be resumed, we
1758 * guarantee this will happen by knowing beforehand that
1759 * we will at least have to run TX completionon one buffer
1761 spin_lock_bh(&txq->axq_lock);
1762 if (!txq->stopped && txq->axq_depth > 1) {
1763 ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
1766 spin_unlock_bh(&txq->axq_lock);
1768 ath_tx_return_buffer(sc, bf);
1773 q = skb_get_queue_mapping(skb);
1777 spin_lock_bh(&txq->axq_lock);
1778 if (++sc->tx.pending_frames[q] > ATH_MAX_QDEPTH && !txq->stopped) {
1779 ath_mac80211_stop_queue(sc, skb_get_queue_mapping(skb));
1782 spin_unlock_bh(&txq->axq_lock);
1784 ath_tx_start_dma(sc, bf, txctl);
1789 void ath_tx_cabq(struct ieee80211_hw *hw, struct sk_buff *skb)
1791 struct ath_wiphy *aphy = hw->priv;
1792 struct ath_softc *sc = aphy->sc;
1793 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1794 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1795 int padpos, padsize;
1796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1797 struct ath_tx_control txctl;
1799 memset(&txctl, 0, sizeof(struct ath_tx_control));
1802 * As a temporary workaround, assign seq# here; this will likely need
1803 * to be cleaned up to work better with Beacon transmission and virtual
1806 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1807 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
1808 sc->tx.seq_no += 0x10;
1809 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
1810 hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
1813 /* Add the padding after the header if this is not already done */
1814 padpos = ath9k_cmn_padpos(hdr->frame_control);
1815 padsize = padpos & 3;
1816 if (padsize && skb->len>padpos) {
1817 if (skb_headroom(skb) < padsize) {
1818 ath_print(common, ATH_DBG_XMIT,
1819 "TX CABQ padding failed\n");
1820 dev_kfree_skb_any(skb);
1823 skb_push(skb, padsize);
1824 memmove(skb->data, skb->data + padsize, padpos);
1827 txctl.txq = sc->beacon.cabq;
1829 ath_print(common, ATH_DBG_XMIT,
1830 "transmitting CABQ packet, skb: %p\n", skb);
1832 if (ath_tx_start(hw, skb, &txctl) != 0) {
1833 ath_print(common, ATH_DBG_XMIT, "CABQ TX failed\n");
1839 dev_kfree_skb_any(skb);
1846 static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
1847 struct ath_wiphy *aphy, int tx_flags)
1849 struct ieee80211_hw *hw = sc->hw;
1850 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1851 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
1852 struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
1853 int q, padpos, padsize;
1855 ath_print(common, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
1860 if (tx_flags & ATH_TX_BAR)
1861 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1863 if (!(tx_flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) {
1864 /* Frame was ACKed */
1865 tx_info->flags |= IEEE80211_TX_STAT_ACK;
1868 padpos = ath9k_cmn_padpos(hdr->frame_control);
1869 padsize = padpos & 3;
1870 if (padsize && skb->len>padpos+padsize) {
1872 * Remove MAC header padding before giving the frame back to
1875 memmove(skb->data + padsize, skb->data, padpos);
1876 skb_pull(skb, padsize);
1879 if (sc->ps_flags & PS_WAIT_FOR_TX_ACK) {
1880 sc->ps_flags &= ~PS_WAIT_FOR_TX_ACK;
1881 ath_print(common, ATH_DBG_PS,
1882 "Going back to sleep after having "
1883 "received TX status (0x%lx)\n",
1884 sc->ps_flags & (PS_WAIT_FOR_BEACON |
1886 PS_WAIT_FOR_PSPOLL_DATA |
1887 PS_WAIT_FOR_TX_ACK));
1890 if (unlikely(tx_info->pad[0] & ATH_TX_INFO_FRAME_TYPE_INTERNAL))
1891 ath9k_tx_status(hw, skb);
1893 q = skb_get_queue_mapping(skb);
1897 if (--sc->tx.pending_frames[q] < 0)
1898 sc->tx.pending_frames[q] = 0;
1900 ieee80211_tx_status(hw, skb);
1904 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
1905 struct ath_txq *txq, struct list_head *bf_q,
1906 struct ath_tx_status *ts, int txok, int sendbar)
1908 struct sk_buff *skb = bf->bf_mpdu;
1909 unsigned long flags;
1913 tx_flags = ATH_TX_BAR;
1916 tx_flags |= ATH_TX_ERROR;
1918 if (bf_isxretried(bf))
1919 tx_flags |= ATH_TX_XRETRY;
1922 dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
1924 if (bf->bf_state.bfs_paprd) {
1925 if (time_after(jiffies,
1926 bf->bf_state.bfs_paprd_timestamp +
1927 msecs_to_jiffies(ATH_PAPRD_TIMEOUT)))
1928 dev_kfree_skb_any(skb);
1930 complete(&sc->paprd_complete);
1932 ath_tx_complete(sc, skb, bf->aphy, tx_flags);
1933 ath_debug_stat_tx(sc, txq, bf, ts);
1937 * Return the list of ath_buf of this mpdu to free queue
1939 spin_lock_irqsave(&sc->tx.txbuflock, flags);
1940 list_splice_tail_init(bf_q, &sc->tx.txbuf);
1941 spin_unlock_irqrestore(&sc->tx.txbuflock, flags);
1944 static int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf,
1945 struct ath_tx_status *ts, int txok)
1948 u32 ba[WME_BA_BMP_SIZE >> 5];
1953 if (bf->bf_lastbf->bf_tx_aborted)
1956 isaggr = bf_isaggr(bf);
1958 seq_st = ts->ts_seqnum;
1959 memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
1963 ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno);
1964 if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
1973 static void ath_tx_rc_status(struct ath_buf *bf, struct ath_tx_status *ts,
1974 int nbad, int txok, bool update_rc)
1976 struct sk_buff *skb = bf->bf_mpdu;
1977 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1978 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1979 struct ieee80211_hw *hw = bf->aphy->hw;
1983 tx_info->status.ack_signal = ts->ts_rssi;
1985 tx_rateindex = ts->ts_rateindex;
1986 WARN_ON(tx_rateindex >= hw->max_rates);
1988 if (ts->ts_status & ATH9K_TXERR_FILT)
1989 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1990 if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && update_rc)
1991 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
1993 if ((ts->ts_status & ATH9K_TXERR_FILT) == 0 &&
1994 (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0 && update_rc) {
1995 if (ieee80211_is_data(hdr->frame_control)) {
1997 (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN))
1998 tx_info->pad[0] |= ATH_TX_INFO_UNDERRUN;
1999 if ((ts->ts_status & ATH9K_TXERR_XRETRY) ||
2000 (ts->ts_status & ATH9K_TXERR_FIFO))
2001 tx_info->pad[0] |= ATH_TX_INFO_XRETRY;
2002 tx_info->status.ampdu_len = bf->bf_nframes;
2003 tx_info->status.ampdu_ack_len = bf->bf_nframes - nbad;
2007 for (i = tx_rateindex + 1; i < hw->max_rates; i++) {
2008 tx_info->status.rates[i].count = 0;
2009 tx_info->status.rates[i].idx = -1;
2012 tx_info->status.rates[tx_rateindex].count = ts->ts_longretry + 1;
2015 static void ath_wake_mac80211_queue(struct ath_softc *sc, struct ath_txq *txq)
2019 qnum = ath_get_mac80211_qnum(txq->axq_class, sc);
2023 spin_lock_bh(&txq->axq_lock);
2024 if (txq->stopped && sc->tx.pending_frames[qnum] < ATH_MAX_QDEPTH) {
2025 if (ath_mac80211_start_queue(sc, qnum))
2028 spin_unlock_bh(&txq->axq_lock);
2031 static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
2033 struct ath_hw *ah = sc->sc_ah;
2034 struct ath_common *common = ath9k_hw_common(ah);
2035 struct ath_buf *bf, *lastbf, *bf_held = NULL;
2036 struct list_head bf_head;
2037 struct ath_desc *ds;
2038 struct ath_tx_status ts;
2042 ath_print(common, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
2043 txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
2047 spin_lock_bh(&txq->axq_lock);
2048 if (list_empty(&txq->axq_q)) {
2049 txq->axq_link = NULL;
2050 spin_unlock_bh(&txq->axq_lock);
2053 bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
2056 * There is a race condition that a BH gets scheduled
2057 * after sw writes TxE and before hw re-load the last
2058 * descriptor to get the newly chained one.
2059 * Software must keep the last DONE descriptor as a
2060 * holding descriptor - software does so by marking
2061 * it with the STALE flag.
2066 if (list_is_last(&bf_held->list, &txq->axq_q)) {
2067 spin_unlock_bh(&txq->axq_lock);
2070 bf = list_entry(bf_held->list.next,
2071 struct ath_buf, list);
2075 lastbf = bf->bf_lastbf;
2076 ds = lastbf->bf_desc;
2078 memset(&ts, 0, sizeof(ts));
2079 status = ath9k_hw_txprocdesc(ah, ds, &ts);
2080 if (status == -EINPROGRESS) {
2081 spin_unlock_bh(&txq->axq_lock);
2086 * We now know the nullfunc frame has been ACKed so we
2089 if (bf->bf_isnullfunc &&
2090 (ts.ts_status & ATH9K_TX_ACKED)) {
2091 if ((sc->ps_flags & PS_ENABLED))
2092 ath9k_enable_ps(sc);
2094 sc->ps_flags |= PS_NULLFUNC_COMPLETED;
2098 * Remove ath_buf's of the same transmit unit from txq,
2099 * however leave the last descriptor back as the holding
2100 * descriptor for hw.
2102 lastbf->bf_stale = true;
2103 INIT_LIST_HEAD(&bf_head);
2104 if (!list_is_singular(&lastbf->list))
2105 list_cut_position(&bf_head,
2106 &txq->axq_q, lastbf->list.prev);
2109 txok = !(ts.ts_status & ATH9K_TXERR_MASK);
2110 txq->axq_tx_inprogress = false;
2112 list_del(&bf_held->list);
2113 spin_unlock_bh(&txq->axq_lock);
2116 ath_tx_return_buffer(sc, bf_held);
2118 if (!bf_isampdu(bf)) {
2120 * This frame is sent out as a single frame.
2121 * Use hardware retry status for this frame.
2123 if (ts.ts_status & ATH9K_TXERR_XRETRY)
2124 bf->bf_state.bf_type |= BUF_XRETRY;
2125 ath_tx_rc_status(bf, &ts, 0, txok, true);
2129 ath_tx_complete_aggr(sc, txq, bf, &bf_head, &ts, txok);
2131 ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, txok, 0);
2133 ath_wake_mac80211_queue(sc, txq);
2135 spin_lock_bh(&txq->axq_lock);
2136 if (sc->sc_flags & SC_OP_TXAGGR)
2137 ath_txq_schedule(sc, txq);
2138 spin_unlock_bh(&txq->axq_lock);
2142 static void ath_tx_complete_poll_work(struct work_struct *work)
2144 struct ath_softc *sc = container_of(work, struct ath_softc,
2145 tx_complete_work.work);
2146 struct ath_txq *txq;
2148 bool needreset = false;
2150 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++)
2151 if (ATH_TXQ_SETUP(sc, i)) {
2152 txq = &sc->tx.txq[i];
2153 spin_lock_bh(&txq->axq_lock);
2154 if (txq->axq_depth) {
2155 if (txq->axq_tx_inprogress) {
2157 spin_unlock_bh(&txq->axq_lock);
2160 txq->axq_tx_inprogress = true;
2163 spin_unlock_bh(&txq->axq_lock);
2167 ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_RESET,
2168 "tx hung, resetting the chip\n");
2169 ath9k_ps_wakeup(sc);
2170 ath_reset(sc, false);
2171 ath9k_ps_restore(sc);
2174 ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
2175 msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT));
2180 void ath_tx_tasklet(struct ath_softc *sc)
2183 u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1);
2185 ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask);
2187 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2188 if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
2189 ath_tx_processq(sc, &sc->tx.txq[i]);
2193 void ath_tx_edma_tasklet(struct ath_softc *sc)
2195 struct ath_tx_status txs;
2196 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2197 struct ath_hw *ah = sc->sc_ah;
2198 struct ath_txq *txq;
2199 struct ath_buf *bf, *lastbf;
2200 struct list_head bf_head;
2205 status = ath9k_hw_txprocdesc(ah, NULL, (void *)&txs);
2206 if (status == -EINPROGRESS)
2208 if (status == -EIO) {
2209 ath_print(common, ATH_DBG_XMIT,
2210 "Error processing tx status\n");
2214 /* Skip beacon completions */
2215 if (txs.qid == sc->beacon.beaconq)
2218 txq = &sc->tx.txq[txs.qid];
2220 spin_lock_bh(&txq->axq_lock);
2221 if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
2222 spin_unlock_bh(&txq->axq_lock);
2226 bf = list_first_entry(&txq->txq_fifo[txq->txq_tailidx],
2227 struct ath_buf, list);
2228 lastbf = bf->bf_lastbf;
2230 INIT_LIST_HEAD(&bf_head);
2231 list_cut_position(&bf_head, &txq->txq_fifo[txq->txq_tailidx],
2233 INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
2235 txq->axq_tx_inprogress = false;
2236 spin_unlock_bh(&txq->axq_lock);
2238 txok = !(txs.ts_status & ATH9K_TXERR_MASK);
2241 * Make sure null func frame is acked before configuring
2244 if (bf->bf_isnullfunc && txok) {
2245 if ((sc->ps_flags & PS_ENABLED))
2246 ath9k_enable_ps(sc);
2248 sc->ps_flags |= PS_NULLFUNC_COMPLETED;
2251 if (!bf_isampdu(bf)) {
2252 if (txs.ts_status & ATH9K_TXERR_XRETRY)
2253 bf->bf_state.bf_type |= BUF_XRETRY;
2254 ath_tx_rc_status(bf, &txs, 0, txok, true);
2258 ath_tx_complete_aggr(sc, txq, bf, &bf_head, &txs, txok);
2260 ath_tx_complete_buf(sc, bf, txq, &bf_head,
2263 ath_wake_mac80211_queue(sc, txq);
2265 spin_lock_bh(&txq->axq_lock);
2266 if (!list_empty(&txq->txq_fifo_pending)) {
2267 INIT_LIST_HEAD(&bf_head);
2268 bf = list_first_entry(&txq->txq_fifo_pending,
2269 struct ath_buf, list);
2270 list_cut_position(&bf_head, &txq->txq_fifo_pending,
2271 &bf->bf_lastbf->list);
2272 ath_tx_txqaddbuf(sc, txq, &bf_head);
2273 } else if (sc->sc_flags & SC_OP_TXAGGR)
2274 ath_txq_schedule(sc, txq);
2275 spin_unlock_bh(&txq->axq_lock);
2283 static int ath_txstatus_setup(struct ath_softc *sc, int size)
2285 struct ath_descdma *dd = &sc->txsdma;
2286 u8 txs_len = sc->sc_ah->caps.txs_len;
2288 dd->dd_desc_len = size * txs_len;
2289 dd->dd_desc = dma_alloc_coherent(sc->dev, dd->dd_desc_len,
2290 &dd->dd_desc_paddr, GFP_KERNEL);
2297 static int ath_tx_edma_init(struct ath_softc *sc)
2301 err = ath_txstatus_setup(sc, ATH_TXSTATUS_RING_SIZE);
2303 ath9k_hw_setup_statusring(sc->sc_ah, sc->txsdma.dd_desc,
2304 sc->txsdma.dd_desc_paddr,
2305 ATH_TXSTATUS_RING_SIZE);
2310 static void ath_tx_edma_cleanup(struct ath_softc *sc)
2312 struct ath_descdma *dd = &sc->txsdma;
2314 dma_free_coherent(sc->dev, dd->dd_desc_len, dd->dd_desc,
2318 int ath_tx_init(struct ath_softc *sc, int nbufs)
2320 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
2323 spin_lock_init(&sc->tx.txbuflock);
2325 error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
2328 ath_print(common, ATH_DBG_FATAL,
2329 "Failed to allocate tx descriptors: %d\n", error);
2333 error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
2334 "beacon", ATH_BCBUF, 1, 1);
2336 ath_print(common, ATH_DBG_FATAL,
2337 "Failed to allocate beacon descriptors: %d\n", error);
2341 INIT_DELAYED_WORK(&sc->tx_complete_work, ath_tx_complete_poll_work);
2343 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
2344 error = ath_tx_edma_init(sc);
2356 void ath_tx_cleanup(struct ath_softc *sc)
2358 if (sc->beacon.bdma.dd_desc_len != 0)
2359 ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf);
2361 if (sc->tx.txdma.dd_desc_len != 0)
2362 ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf);
2364 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
2365 ath_tx_edma_cleanup(sc);
2368 void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
2370 struct ath_atx_tid *tid;
2371 struct ath_atx_ac *ac;
2374 for (tidno = 0, tid = &an->tid[tidno];
2375 tidno < WME_NUM_TID;
2379 tid->seq_start = tid->seq_next = 0;
2380 tid->baw_size = WME_MAX_BA;
2381 tid->baw_head = tid->baw_tail = 0;
2383 tid->paused = false;
2384 tid->state &= ~AGGR_CLEANUP;
2385 INIT_LIST_HEAD(&tid->buf_q);
2386 acno = TID_TO_WME_AC(tidno);
2387 tid->ac = &an->ac[acno];
2388 tid->state &= ~AGGR_ADDBA_COMPLETE;
2389 tid->state &= ~AGGR_ADDBA_PROGRESS;
2392 for (acno = 0, ac = &an->ac[acno];
2393 acno < WME_NUM_AC; acno++, ac++) {
2395 ac->qnum = sc->tx.hwq_map[acno];
2396 INIT_LIST_HEAD(&ac->tid_q);
2400 void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
2402 struct ath_atx_ac *ac;
2403 struct ath_atx_tid *tid;
2404 struct ath_txq *txq;
2407 for (tidno = 0, tid = &an->tid[tidno];
2408 tidno < WME_NUM_TID; tidno++, tid++) {
2411 if (!ATH_TXQ_SETUP(sc, i))
2414 txq = &sc->tx.txq[i];
2417 spin_lock_bh(&txq->axq_lock);
2420 list_del(&tid->list);
2425 list_del(&ac->list);
2426 tid->ac->sched = false;
2429 ath_tid_drain(sc, txq, tid);
2430 tid->state &= ~AGGR_ADDBA_COMPLETE;
2431 tid->state &= ~AGGR_CLEANUP;
2433 spin_unlock_bh(&txq->axq_lock);