2 * Copyright (c) 2008 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.
19 #define BITS_PER_BYTE 8
20 #define OFDM_PLCP_BITS 22
21 #define HT_RC_2_MCS(_rc) ((_rc) & 0x0f)
22 #define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
28 #define HT_LTF(_ns) (4 * (_ns))
29 #define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */
30 #define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */
31 #define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
32 #define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
34 #define OFDM_SIFS_TIME 16
36 static u32 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 */
46 { 52, 108 }, /* 8: BPSK */
47 { 104, 216 }, /* 9: QPSK 1/2 */
48 { 156, 324 }, /* 10: QPSK 3/4 */
49 { 208, 432 }, /* 11: 16-QAM 1/2 */
50 { 312, 648 }, /* 12: 16-QAM 3/4 */
51 { 416, 864 }, /* 13: 64-QAM 2/3 */
52 { 468, 972 }, /* 14: 64-QAM 3/4 */
53 { 520, 1080 }, /* 15: 64-QAM 5/6 */
56 #define IS_HT_RATE(_rate) ((_rate) & 0x80)
59 * Insert a chain of ath_buf (descriptors) on a txq and
60 * assume the descriptors are already chained together by caller.
61 * NB: must be called with txq lock held
64 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
65 struct list_head *head)
67 struct ath_hal *ah = sc->sc_ah;
71 * Insert the frame on the outbound list and
72 * pass it on to the hardware.
78 bf = list_first_entry(head, struct ath_buf, list);
80 list_splice_tail_init(head, &txq->axq_q);
82 txq->axq_totalqueued++;
83 txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list);
85 DPRINTF(sc, ATH_DBG_QUEUE,
86 "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth);
88 if (txq->axq_link == NULL) {
89 ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
90 DPRINTF(sc, ATH_DBG_XMIT,
91 "TXDP[%u] = %llx (%p)\n",
92 txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
94 *txq->axq_link = bf->bf_daddr;
95 DPRINTF(sc, ATH_DBG_XMIT, "link[%u] (%p)=%llx (%p)\n",
96 txq->axq_qnum, txq->axq_link,
97 ito64(bf->bf_daddr), bf->bf_desc);
99 txq->axq_link = &(bf->bf_lastbf->bf_desc->ds_link);
100 ath9k_hw_txstart(ah, txq->axq_qnum);
103 static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
104 struct ath_xmit_status *tx_status)
106 struct ieee80211_hw *hw = sc->hw;
107 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
108 struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
110 DPRINTF(sc, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
112 if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK ||
113 tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
115 tx_info->rate_driver_data[0] = NULL;
118 if (tx_status->flags & ATH_TX_BAR) {
119 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
120 tx_status->flags &= ~ATH_TX_BAR;
123 if (!(tx_status->flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) {
124 /* Frame was ACKed */
125 tx_info->flags |= IEEE80211_TX_STAT_ACK;
128 tx_info->status.rates[0].count = tx_status->retries + 1;
130 ieee80211_tx_status(hw, skb);
133 /* Check if it's okay to send out aggregates */
135 static int ath_aggr_query(struct ath_softc *sc, struct ath_node *an, u8 tidno)
137 struct ath_atx_tid *tid;
138 tid = ATH_AN_2_TID(an, tidno);
140 if (tid->state & AGGR_ADDBA_COMPLETE ||
141 tid->state & AGGR_ADDBA_PROGRESS)
147 static void ath_get_beaconconfig(struct ath_softc *sc, int if_id,
148 struct ath_beacon_config *conf)
150 struct ieee80211_hw *hw = sc->hw;
152 /* fill in beacon config data */
154 conf->beacon_interval = hw->conf.beacon_int;
155 conf->listen_interval = 100;
156 conf->dtim_count = 1;
157 conf->bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf->listen_interval;
160 /* Calculate Atheros packet type from IEEE80211 packet header */
162 static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb)
164 struct ieee80211_hdr *hdr;
165 enum ath9k_pkt_type htype;
168 hdr = (struct ieee80211_hdr *)skb->data;
169 fc = hdr->frame_control;
171 if (ieee80211_is_beacon(fc))
172 htype = ATH9K_PKT_TYPE_BEACON;
173 else if (ieee80211_is_probe_resp(fc))
174 htype = ATH9K_PKT_TYPE_PROBE_RESP;
175 else if (ieee80211_is_atim(fc))
176 htype = ATH9K_PKT_TYPE_ATIM;
177 else if (ieee80211_is_pspoll(fc))
178 htype = ATH9K_PKT_TYPE_PSPOLL;
180 htype = ATH9K_PKT_TYPE_NORMAL;
185 static bool is_pae(struct sk_buff *skb)
187 struct ieee80211_hdr *hdr;
190 hdr = (struct ieee80211_hdr *)skb->data;
191 fc = hdr->frame_control;
193 if (ieee80211_is_data(fc)) {
194 if (ieee80211_is_nullfunc(fc) ||
195 /* Port Access Entity (IEEE 802.1X) */
196 (skb->protocol == cpu_to_be16(ETH_P_PAE))) {
204 static int get_hw_crypto_keytype(struct sk_buff *skb)
206 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
208 if (tx_info->control.hw_key) {
209 if (tx_info->control.hw_key->alg == ALG_WEP)
210 return ATH9K_KEY_TYPE_WEP;
211 else if (tx_info->control.hw_key->alg == ALG_TKIP)
212 return ATH9K_KEY_TYPE_TKIP;
213 else if (tx_info->control.hw_key->alg == ALG_CCMP)
214 return ATH9K_KEY_TYPE_AES;
217 return ATH9K_KEY_TYPE_CLEAR;
220 /* Called only when tx aggregation is enabled and HT is supported */
222 static void assign_aggr_tid_seqno(struct sk_buff *skb,
225 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
226 struct ieee80211_hdr *hdr;
228 struct ath_atx_tid *tid;
232 if (!tx_info->control.sta)
235 an = (struct ath_node *)tx_info->control.sta->drv_priv;
236 hdr = (struct ieee80211_hdr *)skb->data;
237 fc = hdr->frame_control;
241 if (ieee80211_is_data_qos(fc)) {
242 qc = ieee80211_get_qos_ctl(hdr);
243 bf->bf_tidno = qc[0] & 0xf;
248 if (ieee80211_is_data(fc) && !is_pae(skb)) {
249 /* For HT capable stations, we save tidno for later use.
250 * We also override seqno set by upper layer with the one
251 * in tx aggregation state.
253 * If fragmentation is on, the sequence number is
254 * not overridden, since it has been
255 * incremented by the fragmentation routine.
257 * FIXME: check if the fragmentation threshold exceeds
260 tid = ATH_AN_2_TID(an, bf->bf_tidno);
261 hdr->seq_ctrl = cpu_to_le16(tid->seq_next <<
262 IEEE80211_SEQ_SEQ_SHIFT);
263 bf->bf_seqno = tid->seq_next;
264 INCR(tid->seq_next, IEEE80211_SEQ_MAX);
268 static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb,
271 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
274 flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
275 flags |= ATH9K_TXDESC_INTREQ;
277 if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
278 flags |= ATH9K_TXDESC_NOACK;
279 if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
280 flags |= ATH9K_TXDESC_RTSENA;
285 static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
287 struct ath_buf *bf = NULL;
289 spin_lock_bh(&sc->sc_txbuflock);
291 if (unlikely(list_empty(&sc->sc_txbuf))) {
292 spin_unlock_bh(&sc->sc_txbuflock);
296 bf = list_first_entry(&sc->sc_txbuf, struct ath_buf, list);
299 spin_unlock_bh(&sc->sc_txbuflock);
304 /* To complete a chain of buffers associated a frame */
306 static void ath_tx_complete_buf(struct ath_softc *sc,
308 struct list_head *bf_q,
309 int txok, int sendbar)
311 struct sk_buff *skb = bf->bf_mpdu;
312 struct ath_xmit_status tx_status;
315 * Set retry information.
316 * NB: Don't use the information in the descriptor, because the frame
317 * could be software retried.
319 tx_status.retries = bf->bf_retries;
323 tx_status.flags = ATH_TX_BAR;
326 tx_status.flags |= ATH_TX_ERROR;
328 if (bf_isxretried(bf))
329 tx_status.flags |= ATH_TX_XRETRY;
332 /* Unmap this frame */
333 pci_unmap_single(sc->pdev,
337 /* complete this frame */
338 ath_tx_complete(sc, skb, &tx_status);
341 * Return the list of ath_buf of this mpdu to free queue
343 spin_lock_bh(&sc->sc_txbuflock);
344 list_splice_tail_init(bf_q, &sc->sc_txbuf);
345 spin_unlock_bh(&sc->sc_txbuflock);
349 * queue up a dest/ac pair for tx scheduling
350 * NB: must be called with txq lock held
353 static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
355 struct ath_atx_ac *ac = tid->ac;
358 * if tid is paused, hold off
364 * add tid to ac atmost once
370 list_add_tail(&tid->list, &ac->tid_q);
373 * add node ac to txq atmost once
379 list_add_tail(&ac->list, &txq->axq_acq);
384 static void ath_tx_pause_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
386 struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
388 spin_lock_bh(&txq->axq_lock);
392 spin_unlock_bh(&txq->axq_lock);
395 /* resume a tid and schedule aggregate */
397 void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
399 struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
401 ASSERT(tid->paused > 0);
402 spin_lock_bh(&txq->axq_lock);
409 if (list_empty(&tid->buf_q))
413 * Add this TID to scheduler and try to send out aggregates
415 ath_tx_queue_tid(txq, tid);
416 ath_txq_schedule(sc, txq);
418 spin_unlock_bh(&txq->axq_lock);
421 /* Compute the number of bad frames */
423 static int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf,
426 struct ath_buf *bf_last = bf->bf_lastbf;
427 struct ath_desc *ds = bf_last->bf_desc;
429 u32 ba[WME_BA_BMP_SIZE >> 5];
434 if (ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED)
437 isaggr = bf_isaggr(bf);
439 seq_st = ATH_DS_BA_SEQ(ds);
440 memcpy(ba, ATH_DS_BA_BITMAP(ds), WME_BA_BMP_SIZE >> 3);
444 ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno);
445 if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
454 static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
457 struct ieee80211_hdr *hdr;
459 bf->bf_state.bf_type |= BUF_RETRY;
463 hdr = (struct ieee80211_hdr *)skb->data;
464 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
467 /* Update block ack window */
469 static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
474 index = ATH_BA_INDEX(tid->seq_start, seqno);
475 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
477 tid->tx_buf[cindex] = NULL;
479 while (tid->baw_head != tid->baw_tail && !tid->tx_buf[tid->baw_head]) {
480 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
481 INCR(tid->baw_head, ATH_TID_MAX_BUFS);
486 * ath_pkt_dur - compute packet duration (NB: not NAV)
489 * pktlen - total bytes (delims + data + fcs + pads + pad delims)
490 * width - 0 for 20 MHz, 1 for 40 MHz
491 * half_gi - to use 4us v/s 3.6 us for symbol time
493 static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, struct ath_buf *bf,
494 int width, int half_gi, bool shortPreamble)
496 struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
497 u32 nbits, nsymbits, duration, nsymbols;
501 pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen;
502 rc = rate_table->info[rix].ratecode;
504 /* for legacy rates, use old function to compute packet duration */
506 return ath9k_hw_computetxtime(sc->sc_ah, rate_table, pktlen,
509 /* find number of symbols: PLCP + data */
510 nbits = (pktlen << 3) + OFDM_PLCP_BITS;
511 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
512 nsymbols = (nbits + nsymbits - 1) / nsymbits;
515 duration = SYMBOL_TIME(nsymbols);
517 duration = SYMBOL_TIME_HALFGI(nsymbols);
519 /* addup duration for legacy/ht training and signal fields */
520 streams = HT_RC_2_STREAMS(rc);
521 duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
526 /* Rate module function to set rate related fields in tx descriptor */
528 static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
530 struct ath_hal *ah = sc->sc_ah;
531 struct ath_rate_table *rt;
532 struct ath_desc *ds = bf->bf_desc;
533 struct ath_desc *lastds = bf->bf_lastbf->bf_desc;
534 struct ath9k_11n_rate_series series[4];
536 struct ieee80211_tx_info *tx_info;
537 struct ieee80211_tx_rate *rates;
538 struct ieee80211_hdr *hdr;
539 int i, flags, rtsctsena = 0;
541 u8 rix = 0, cix, ctsrate = 0;
544 memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
546 skb = (struct sk_buff *)bf->bf_mpdu;
547 hdr = (struct ieee80211_hdr *)skb->data;
548 fc = hdr->frame_control;
549 tx_info = IEEE80211_SKB_CB(skb);
550 rates = tx_info->control.rates;
552 if (ieee80211_has_morefrags(fc) ||
553 (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
554 rates[1].count = rates[2].count = rates[3].count = 0;
555 rates[1].idx = rates[2].idx = rates[3].idx = 0;
556 rates[0].count = ATH_TXMAXTRY;
559 /* get the cix for the lowest valid rix */
560 rt = sc->hw_rate_table[sc->sc_curmode];
561 for (i = 3; i >= 0; i--) {
562 if (rates[i].count && (rates[i].idx >= 0)) {
568 flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA));
569 cix = rt->info[rix].ctrl_rate;
572 * If 802.11g protection is enabled, determine whether to use RTS/CTS or
573 * just CTS. Note that this is only done for OFDM/HT unicast frames.
575 if (sc->sc_protmode != PROT_M_NONE && !(bf->bf_flags & ATH9K_TXDESC_NOACK)
576 && (rt->info[rix].phy == WLAN_RC_PHY_OFDM ||
577 WLAN_RC_PHY_HT(rt->info[rix].phy))) {
578 if (sc->sc_protmode == PROT_M_RTSCTS)
579 flags = ATH9K_TXDESC_RTSENA;
580 else if (sc->sc_protmode == PROT_M_CTSONLY)
581 flags = ATH9K_TXDESC_CTSENA;
583 cix = rt->info[sc->sc_protrix].ctrl_rate;
587 /* For 11n, the default behavior is to enable RTS for hw retried frames.
588 * We enable the global flag here and let rate series flags determine
589 * which rates will actually use RTS.
591 if ((ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) && bf_isdata(bf)) {
592 /* 802.11g protection not needed, use our default behavior */
594 flags = ATH9K_TXDESC_RTSENA;
597 /* Set protection if aggregate protection on */
598 if (sc->sc_config.ath_aggr_prot &&
599 (!bf_isaggr(bf) || (bf_isaggr(bf) && bf->bf_al < 8192))) {
600 flags = ATH9K_TXDESC_RTSENA;
601 cix = rt->info[sc->sc_protrix].ctrl_rate;
605 /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
606 if (bf_isaggr(bf) && (bf->bf_al > ah->ah_caps.rts_aggr_limit))
607 flags &= ~(ATH9K_TXDESC_RTSENA);
610 * CTS transmit rate is derived from the transmit rate by looking in the
611 * h/w rate table. We must also factor in whether or not a short
612 * preamble is to be used. NB: cix is set above where RTS/CTS is enabled
614 ctsrate = rt->info[cix].ratecode |
615 (bf_isshpreamble(bf) ? rt->info[cix].short_preamble : 0);
617 for (i = 0; i < 4; i++) {
618 if (!rates[i].count || (rates[i].idx < 0))
623 series[i].Rate = rt->info[rix].ratecode |
624 (bf_isshpreamble(bf) ? rt->info[rix].short_preamble : 0);
626 series[i].Tries = rates[i].count;
628 series[i].RateFlags = (
629 (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) ?
630 ATH9K_RATESERIES_RTS_CTS : 0) |
631 ((rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ?
632 ATH9K_RATESERIES_2040 : 0) |
633 ((rates[i].flags & IEEE80211_TX_RC_SHORT_GI) ?
634 ATH9K_RATESERIES_HALFGI : 0);
636 series[i].PktDuration = ath_pkt_duration(sc, rix, bf,
637 (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) != 0,
638 (rates[i].flags & IEEE80211_TX_RC_SHORT_GI),
639 bf_isshpreamble(bf));
641 series[i].ChSel = sc->sc_tx_chainmask;
644 series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
647 /* set dur_update_en for l-sig computation except for PS-Poll frames */
648 ath9k_hw_set11n_ratescenario(ah, ds, lastds, !bf_ispspoll(bf),
649 ctsrate, ctsduration,
652 if (sc->sc_config.ath_aggr_prot && flags)
653 ath9k_hw_set11n_burstduration(ah, ds, 8192);
657 * Function to send a normal HT (non-AMPDU) frame
658 * NB: must be called with txq lock held
660 static int ath_tx_send_normal(struct ath_softc *sc,
662 struct ath_atx_tid *tid,
663 struct list_head *bf_head)
667 BUG_ON(list_empty(bf_head));
669 bf = list_first_entry(bf_head, struct ath_buf, list);
670 bf->bf_state.bf_type &= ~BUF_AMPDU; /* regular HT frame */
672 /* update starting sequence number for subsequent ADDBA request */
673 INCR(tid->seq_start, IEEE80211_SEQ_MAX);
675 /* Queue to h/w without aggregation */
677 bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */
678 ath_buf_set_rate(sc, bf);
679 ath_tx_txqaddbuf(sc, txq, bf_head);
684 /* flush tid's software queue and send frames as non-ampdu's */
686 static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
688 struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
690 struct list_head bf_head;
691 INIT_LIST_HEAD(&bf_head);
693 ASSERT(tid->paused > 0);
694 spin_lock_bh(&txq->axq_lock);
698 if (tid->paused > 0) {
699 spin_unlock_bh(&txq->axq_lock);
703 while (!list_empty(&tid->buf_q)) {
704 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
705 ASSERT(!bf_isretried(bf));
706 list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
707 ath_tx_send_normal(sc, txq, tid, &bf_head);
710 spin_unlock_bh(&txq->axq_lock);
713 /* Completion routine of an aggregate */
715 static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
718 struct list_head *bf_q,
721 struct ath_node *an = NULL;
723 struct ieee80211_tx_info *tx_info;
724 struct ath_atx_tid *tid = NULL;
725 struct ath_buf *bf_last = bf->bf_lastbf;
726 struct ath_desc *ds = bf_last->bf_desc;
727 struct ath_buf *bf_next, *bf_lastq = NULL;
728 struct list_head bf_head, bf_pending;
730 u32 ba[WME_BA_BMP_SIZE >> 5];
731 int isaggr, txfail, txpending, sendbar = 0, needreset = 0;
733 skb = (struct sk_buff *)bf->bf_mpdu;
734 tx_info = IEEE80211_SKB_CB(skb);
736 if (tx_info->control.sta) {
737 an = (struct ath_node *)tx_info->control.sta->drv_priv;
738 tid = ATH_AN_2_TID(an, bf->bf_tidno);
741 isaggr = bf_isaggr(bf);
744 if (ATH_DS_TX_BA(ds)) {
746 * extract starting sequence and
749 seq_st = ATH_DS_BA_SEQ(ds);
751 ATH_DS_BA_BITMAP(ds),
752 WME_BA_BMP_SIZE >> 3);
754 memset(ba, 0, WME_BA_BMP_SIZE >> 3);
757 * AR5416 can become deaf/mute when BA
758 * issue happens. Chip needs to be reset.
759 * But AP code may have sychronization issues
760 * when perform internal reset in this routine.
761 * Only enable reset in STA mode for now.
763 if (sc->sc_ah->ah_opmode == ATH9K_M_STA)
767 memset(ba, 0, WME_BA_BMP_SIZE >> 3);
771 INIT_LIST_HEAD(&bf_pending);
772 INIT_LIST_HEAD(&bf_head);
775 txfail = txpending = 0;
776 bf_next = bf->bf_next;
778 if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, bf->bf_seqno))) {
779 /* transmit completion, subframe is
780 * acked by block ack */
781 } else if (!isaggr && txok) {
782 /* transmit completion */
785 if (!(tid->state & AGGR_CLEANUP) &&
786 ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) {
787 if (bf->bf_retries < ATH_MAX_SW_RETRIES) {
788 ath_tx_set_retry(sc, bf);
791 bf->bf_state.bf_type |= BUF_XRETRY;
797 * cleanup in progress, just fail
798 * the un-acked sub-frames
804 * Remove ath_buf's of this sub-frame from aggregate queue.
806 if (bf_next == NULL) { /* last subframe in the aggregate */
807 ASSERT(bf->bf_lastfrm == bf_last);
810 * The last descriptor of the last sub frame could be
811 * a holding descriptor for h/w. If that's the case,
812 * bf->bf_lastfrm won't be in the bf_q.
813 * Make sure we handle bf_q properly here.
816 if (!list_empty(bf_q)) {
817 bf_lastq = list_entry(bf_q->prev,
818 struct ath_buf, list);
819 list_cut_position(&bf_head,
820 bf_q, &bf_lastq->list);
823 * XXX: if the last subframe only has one
824 * descriptor which is also being used as
825 * a holding descriptor. Then the ath_buf
826 * is not in the bf_q at all.
828 INIT_LIST_HEAD(&bf_head);
831 ASSERT(!list_empty(bf_q));
832 list_cut_position(&bf_head,
833 bf_q, &bf->bf_lastfrm->list);
838 * complete the acked-ones/xretried ones; update
841 spin_lock_bh(&txq->axq_lock);
842 ath_tx_update_baw(sc, tid, bf->bf_seqno);
843 spin_unlock_bh(&txq->axq_lock);
845 /* complete this sub-frame */
846 ath_tx_complete_buf(sc, bf, &bf_head, !txfail, sendbar);
849 * retry the un-acked ones
852 * XXX: if the last descriptor is holding descriptor,
853 * in order to requeue the frame to software queue, we
854 * need to allocate a new descriptor and
855 * copy the content of holding descriptor to it.
857 if (bf->bf_next == NULL &&
858 bf_last->bf_status & ATH_BUFSTATUS_STALE) {
861 /* allocate new descriptor */
862 spin_lock_bh(&sc->sc_txbuflock);
863 ASSERT(!list_empty((&sc->sc_txbuf)));
864 tbf = list_first_entry(&sc->sc_txbuf,
865 struct ath_buf, list);
866 list_del(&tbf->list);
867 spin_unlock_bh(&sc->sc_txbuflock);
869 ATH_TXBUF_RESET(tbf);
871 /* copy descriptor content */
872 tbf->bf_mpdu = bf_last->bf_mpdu;
873 tbf->bf_buf_addr = bf_last->bf_buf_addr;
874 *(tbf->bf_desc) = *(bf_last->bf_desc);
876 /* link it to the frame */
878 bf_lastq->bf_desc->ds_link =
880 bf->bf_lastfrm = tbf;
881 ath9k_hw_cleartxdesc(sc->sc_ah,
882 bf->bf_lastfrm->bf_desc);
884 tbf->bf_state = bf_last->bf_state;
885 tbf->bf_lastfrm = tbf;
886 ath9k_hw_cleartxdesc(sc->sc_ah,
887 tbf->bf_lastfrm->bf_desc);
889 /* copy the DMA context */
891 bf_last->bf_dmacontext;
893 list_add_tail(&tbf->list, &bf_head);
896 * Clear descriptor status words for
899 ath9k_hw_cleartxdesc(sc->sc_ah,
900 bf->bf_lastfrm->bf_desc);
904 * Put this buffer to the temporary pending
905 * queue to retain ordering
907 list_splice_tail_init(&bf_head, &bf_pending);
913 if (tid->state & AGGR_CLEANUP) {
914 /* check to see if we're done with cleaning the h/w queue */
915 spin_lock_bh(&txq->axq_lock);
917 if (tid->baw_head == tid->baw_tail) {
918 tid->state &= ~AGGR_ADDBA_COMPLETE;
919 tid->addba_exchangeattempts = 0;
920 spin_unlock_bh(&txq->axq_lock);
922 tid->state &= ~AGGR_CLEANUP;
924 /* send buffered frames as singles */
925 ath_tx_flush_tid(sc, tid);
927 spin_unlock_bh(&txq->axq_lock);
933 * prepend un-acked frames to the beginning of the pending frame queue
935 if (!list_empty(&bf_pending)) {
936 spin_lock_bh(&txq->axq_lock);
937 /* Note: we _prepend_, we _do_not_ at to
938 * the end of the queue ! */
939 list_splice(&bf_pending, &tid->buf_q);
940 ath_tx_queue_tid(txq, tid);
941 spin_unlock_bh(&txq->axq_lock);
945 ath_reset(sc, false);
950 static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds, int nbad)
952 struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
953 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
954 struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
956 tx_info_priv->update_rc = false;
957 if (ds->ds_txstat.ts_status & ATH9K_TXERR_FILT)
958 tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
960 if ((ds->ds_txstat.ts_status & ATH9K_TXERR_FILT) == 0 &&
961 (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) {
963 memcpy(&tx_info_priv->tx, &ds->ds_txstat,
964 sizeof(tx_info_priv->tx));
965 tx_info_priv->n_frames = bf->bf_nframes;
966 tx_info_priv->n_bad_frames = nbad;
967 tx_info_priv->update_rc = true;
972 /* Process completed xmit descriptors from the specified queue */
974 static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
976 struct ath_hal *ah = sc->sc_ah;
977 struct ath_buf *bf, *lastbf, *bf_held = NULL;
978 struct list_head bf_head;
983 DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
984 txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
988 spin_lock_bh(&txq->axq_lock);
989 if (list_empty(&txq->axq_q)) {
990 txq->axq_link = NULL;
991 txq->axq_linkbuf = NULL;
992 spin_unlock_bh(&txq->axq_lock);
995 bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
998 * There is a race condition that a BH gets scheduled
999 * after sw writes TxE and before hw re-load the last
1000 * descriptor to get the newly chained one.
1001 * Software must keep the last DONE descriptor as a
1002 * holding descriptor - software does so by marking
1003 * it with the STALE flag.
1006 if (bf->bf_status & ATH_BUFSTATUS_STALE) {
1008 if (list_is_last(&bf_held->list, &txq->axq_q)) {
1010 * The holding descriptor is the last
1011 * descriptor in queue. It's safe to remove
1012 * the last holding descriptor in BH context.
1014 spin_unlock_bh(&txq->axq_lock);
1017 /* Lets work with the next buffer now */
1018 bf = list_entry(bf_held->list.next,
1019 struct ath_buf, list);
1023 lastbf = bf->bf_lastbf;
1024 ds = lastbf->bf_desc; /* NB: last decriptor */
1026 status = ath9k_hw_txprocdesc(ah, ds);
1027 if (status == -EINPROGRESS) {
1028 spin_unlock_bh(&txq->axq_lock);
1031 if (bf->bf_desc == txq->axq_lastdsWithCTS)
1032 txq->axq_lastdsWithCTS = NULL;
1033 if (ds == txq->axq_gatingds)
1034 txq->axq_gatingds = NULL;
1037 * Remove ath_buf's of the same transmit unit from txq,
1038 * however leave the last descriptor back as the holding
1039 * descriptor for hw.
1041 lastbf->bf_status |= ATH_BUFSTATUS_STALE;
1042 INIT_LIST_HEAD(&bf_head);
1044 if (!list_is_singular(&lastbf->list))
1045 list_cut_position(&bf_head,
1046 &txq->axq_q, lastbf->list.prev);
1051 txq->axq_aggr_depth--;
1053 txok = (ds->ds_txstat.ts_status == 0);
1055 spin_unlock_bh(&txq->axq_lock);
1058 list_del(&bf_held->list);
1059 spin_lock_bh(&sc->sc_txbuflock);
1060 list_add_tail(&bf_held->list, &sc->sc_txbuf);
1061 spin_unlock_bh(&sc->sc_txbuflock);
1064 if (!bf_isampdu(bf)) {
1066 * This frame is sent out as a single frame.
1067 * Use hardware retry status for this frame.
1069 bf->bf_retries = ds->ds_txstat.ts_longretry;
1070 if (ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY)
1071 bf->bf_state.bf_type |= BUF_XRETRY;
1074 nbad = ath_tx_num_badfrms(sc, bf, txok);
1077 ath_tx_rc_status(bf, ds, nbad);
1080 * Complete this transmit unit
1083 ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, txok);
1085 ath_tx_complete_buf(sc, bf, &bf_head, txok, 0);
1087 /* Wake up mac80211 queue */
1089 spin_lock_bh(&txq->axq_lock);
1090 if (txq->stopped && ath_txq_depth(sc, txq->axq_qnum) <=
1093 qnum = ath_get_mac80211_qnum(txq->axq_qnum, sc);
1095 ieee80211_wake_queue(sc->hw, qnum);
1102 * schedule any pending packets if aggregation is enabled
1104 if (sc->sc_flags & SC_OP_TXAGGR)
1105 ath_txq_schedule(sc, txq);
1106 spin_unlock_bh(&txq->axq_lock);
1110 static void ath_tx_stopdma(struct ath_softc *sc, struct ath_txq *txq)
1112 struct ath_hal *ah = sc->sc_ah;
1114 (void) ath9k_hw_stoptxdma(ah, txq->axq_qnum);
1115 DPRINTF(sc, ATH_DBG_XMIT, "tx queue [%u] %x, link %p\n",
1116 txq->axq_qnum, ath9k_hw_gettxbuf(ah, txq->axq_qnum),
1120 /* Drain only the data queues */
1122 static void ath_drain_txdataq(struct ath_softc *sc, bool retry_tx)
1124 struct ath_hal *ah = sc->sc_ah;
1125 int i, status, npend = 0;
1127 if (!(sc->sc_flags & SC_OP_INVALID)) {
1128 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1129 if (ATH_TXQ_SETUP(sc, i)) {
1130 ath_tx_stopdma(sc, &sc->sc_txq[i]);
1131 /* The TxDMA may not really be stopped.
1132 * Double check the hal tx pending count */
1133 npend += ath9k_hw_numtxpending(ah,
1134 sc->sc_txq[i].axq_qnum);
1140 /* TxDMA not stopped, reset the hal */
1141 DPRINTF(sc, ATH_DBG_XMIT, "Unable to stop TxDMA. Reset HAL!\n");
1143 spin_lock_bh(&sc->sc_resetlock);
1144 if (!ath9k_hw_reset(ah,
1145 sc->sc_ah->ah_curchan,
1147 sc->sc_tx_chainmask, sc->sc_rx_chainmask,
1148 sc->sc_ht_extprotspacing, true, &status)) {
1150 DPRINTF(sc, ATH_DBG_FATAL,
1151 "Unable to reset hardware; hal status %u\n",
1154 spin_unlock_bh(&sc->sc_resetlock);
1157 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
1158 if (ATH_TXQ_SETUP(sc, i))
1159 ath_tx_draintxq(sc, &sc->sc_txq[i], retry_tx);
1163 /* Add a sub-frame to block ack window */
1165 static void ath_tx_addto_baw(struct ath_softc *sc,
1166 struct ath_atx_tid *tid,
1171 if (bf_isretried(bf))
1174 index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno);
1175 cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
1177 ASSERT(tid->tx_buf[cindex] == NULL);
1178 tid->tx_buf[cindex] = bf;
1180 if (index >= ((tid->baw_tail - tid->baw_head) &
1181 (ATH_TID_MAX_BUFS - 1))) {
1182 tid->baw_tail = cindex;
1183 INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
1188 * Function to send an A-MPDU
1189 * NB: must be called with txq lock held
1191 static int ath_tx_send_ampdu(struct ath_softc *sc,
1192 struct ath_atx_tid *tid,
1193 struct list_head *bf_head,
1194 struct ath_tx_control *txctl)
1198 BUG_ON(list_empty(bf_head));
1200 bf = list_first_entry(bf_head, struct ath_buf, list);
1201 bf->bf_state.bf_type |= BUF_AMPDU;
1204 * Do not queue to h/w when any of the following conditions is true:
1205 * - there are pending frames in software queue
1206 * - the TID is currently paused for ADDBA/BAR request
1207 * - seqno is not within block-ack window
1208 * - h/w queue depth exceeds low water mark
1210 if (!list_empty(&tid->buf_q) || tid->paused ||
1211 !BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno) ||
1212 txctl->txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) {
1214 * Add this frame to software queue for scheduling later
1217 list_splice_tail_init(bf_head, &tid->buf_q);
1218 ath_tx_queue_tid(txctl->txq, tid);
1222 /* Add sub-frame to BAW */
1223 ath_tx_addto_baw(sc, tid, bf);
1225 /* Queue to h/w without aggregation */
1227 bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */
1228 ath_buf_set_rate(sc, bf);
1229 ath_tx_txqaddbuf(sc, txctl->txq, bf_head);
1236 * returns aggr limit based on lowest of the rates
1238 static u32 ath_lookup_rate(struct ath_softc *sc,
1240 struct ath_atx_tid *tid)
1242 struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
1243 struct sk_buff *skb;
1244 struct ieee80211_tx_info *tx_info;
1245 struct ieee80211_tx_rate *rates;
1246 struct ath_tx_info_priv *tx_info_priv;
1247 u32 max_4ms_framelen, frame_length;
1248 u16 aggr_limit, legacy = 0, maxampdu;
1251 skb = (struct sk_buff *)bf->bf_mpdu;
1252 tx_info = IEEE80211_SKB_CB(skb);
1253 rates = tx_info->control.rates;
1255 (struct ath_tx_info_priv *)tx_info->rate_driver_data[0];
1258 * Find the lowest frame length among the rate series that will have a
1259 * 4ms transmit duration.
1260 * TODO - TXOP limit needs to be considered.
1262 max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
1264 for (i = 0; i < 4; i++) {
1265 if (rates[i].count) {
1266 if (!WLAN_RC_PHY_HT(rate_table->info[rates[i].idx].phy)) {
1272 rate_table->info[rates[i].idx].max_4ms_framelen;
1273 max_4ms_framelen = min(max_4ms_framelen, frame_length);
1278 * limit aggregate size by the minimum rate if rate selected is
1279 * not a probe rate, if rate selected is a probe rate then
1280 * avoid aggregation of this packet.
1282 if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy)
1285 aggr_limit = min(max_4ms_framelen,
1286 (u32)ATH_AMPDU_LIMIT_DEFAULT);
1289 * h/w can accept aggregates upto 16 bit lengths (65535).
1290 * The IE, however can hold upto 65536, which shows up here
1291 * as zero. Ignore 65536 since we are constrained by hw.
1293 maxampdu = tid->an->maxampdu;
1295 aggr_limit = min(aggr_limit, maxampdu);
1301 * returns the number of delimiters to be added to
1302 * meet the minimum required mpdudensity.
1303 * caller should make sure that the rate is HT rate .
1305 static int ath_compute_num_delims(struct ath_softc *sc,
1306 struct ath_atx_tid *tid,
1310 struct ath_rate_table *rt = sc->hw_rate_table[sc->sc_curmode];
1311 struct sk_buff *skb = bf->bf_mpdu;
1312 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1313 u32 nsymbits, nsymbols, mpdudensity;
1316 int width, half_gi, ndelim, mindelim;
1318 /* Select standard number of delimiters based on frame length alone */
1319 ndelim = ATH_AGGR_GET_NDELIM(frmlen);
1322 * If encryption enabled, hardware requires some more padding between
1324 * TODO - this could be improved to be dependent on the rate.
1325 * The hardware can keep up at lower rates, but not higher rates
1327 if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR)
1328 ndelim += ATH_AGGR_ENCRYPTDELIM;
1331 * Convert desired mpdu density from microeconds to bytes based
1332 * on highest rate in rate series (i.e. first rate) to determine
1333 * required minimum length for subframe. Take into account
1334 * whether high rate is 20 or 40Mhz and half or full GI.
1336 mpdudensity = tid->an->mpdudensity;
1339 * If there is no mpdu density restriction, no further calculation
1342 if (mpdudensity == 0)
1345 rix = tx_info->control.rates[0].idx;
1346 flags = tx_info->control.rates[0].flags;
1347 rc = rt->info[rix].ratecode;
1348 width = (flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? 1 : 0;
1349 half_gi = (flags & IEEE80211_TX_RC_SHORT_GI) ? 1 : 0;
1352 nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
1354 nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
1359 nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
1360 minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
1362 /* Is frame shorter than required minimum length? */
1363 if (frmlen < minlen) {
1364 /* Get the minimum number of delimiters required. */
1365 mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ;
1366 ndelim = max(mindelim, ndelim);
1373 * For aggregation from software buffer queue.
1374 * NB: must be called with txq lock held
1376 static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
1377 struct ath_atx_tid *tid,
1378 struct list_head *bf_q,
1379 struct ath_buf **bf_last,
1380 struct aggr_rifs_param *param,
1383 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
1384 struct ath_buf *bf, *tbf, *bf_first, *bf_prev = NULL;
1385 struct list_head bf_head;
1386 int rl = 0, nframes = 0, ndelim;
1387 u16 aggr_limit = 0, al = 0, bpad = 0,
1388 al_delta, h_baw = tid->baw_size / 2;
1389 enum ATH_AGGR_STATUS status = ATH_AGGR_DONE;
1391 INIT_LIST_HEAD(&bf_head);
1393 BUG_ON(list_empty(&tid->buf_q));
1395 bf_first = list_first_entry(&tid->buf_q, struct ath_buf, list);
1398 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
1401 * do not step over block-ack window
1403 if (!BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno)) {
1404 status = ATH_AGGR_BAW_CLOSED;
1409 aggr_limit = ath_lookup_rate(sc, bf, tid);
1414 * do not exceed aggregation limit
1416 al_delta = ATH_AGGR_DELIM_SZ + bf->bf_frmlen;
1418 if (nframes && (aggr_limit <
1419 (al + bpad + al_delta + prev_al))) {
1420 status = ATH_AGGR_LIMITED;
1425 * do not exceed subframe limit
1427 if ((nframes + *prev_frames) >=
1428 min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) {
1429 status = ATH_AGGR_LIMITED;
1434 * add padding for previous frame to aggregation length
1436 al += bpad + al_delta;
1439 * Get the delimiters needed to meet the MPDU
1440 * density for this node.
1442 ndelim = ath_compute_num_delims(sc, tid, bf_first, bf->bf_frmlen);
1444 bpad = PADBYTES(al_delta) + (ndelim << 2);
1447 bf->bf_lastfrm->bf_desc->ds_link = 0;
1450 * this packet is part of an aggregate
1451 * - remove all descriptors belonging to this frame from
1453 * - add it to block ack window
1454 * - set up descriptors for aggregation
1456 list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
1457 ath_tx_addto_baw(sc, tid, bf);
1459 list_for_each_entry(tbf, &bf_head, list) {
1460 ath9k_hw_set11n_aggr_middle(sc->sc_ah,
1461 tbf->bf_desc, ndelim);
1465 * link buffers of this frame to the aggregate
1467 list_splice_tail_init(&bf_head, bf_q);
1471 bf_prev->bf_next = bf;
1472 bf_prev->bf_lastfrm->bf_desc->ds_link = bf->bf_daddr;
1478 * terminate aggregation on a small packet boundary
1480 if (bf->bf_frmlen < ATH_AGGR_MINPLEN) {
1481 status = ATH_AGGR_SHORTPKT;
1485 } while (!list_empty(&tid->buf_q));
1487 bf_first->bf_al = al;
1488 bf_first->bf_nframes = nframes;
1495 * process pending frames possibly doing a-mpdu aggregation
1496 * NB: must be called with txq lock held
1498 static void ath_tx_sched_aggr(struct ath_softc *sc,
1499 struct ath_txq *txq, struct ath_atx_tid *tid)
1501 struct ath_buf *bf, *tbf, *bf_last, *bf_lastaggr = NULL;
1502 enum ATH_AGGR_STATUS status;
1503 struct list_head bf_q;
1504 struct aggr_rifs_param param = {0, 0, 0, 0, NULL};
1505 int prev_frames = 0;
1508 if (list_empty(&tid->buf_q))
1511 INIT_LIST_HEAD(&bf_q);
1513 status = ath_tx_form_aggr(sc, tid, &bf_q, &bf_lastaggr, ¶m,
1517 * no frames picked up to be aggregated; block-ack
1518 * window is not open
1520 if (list_empty(&bf_q))
1523 bf = list_first_entry(&bf_q, struct ath_buf, list);
1524 bf_last = list_entry(bf_q.prev, struct ath_buf, list);
1525 bf->bf_lastbf = bf_last;
1528 * if only one frame, send as non-aggregate
1530 if (bf->bf_nframes == 1) {
1531 ASSERT(bf->bf_lastfrm == bf_last);
1533 bf->bf_state.bf_type &= ~BUF_AGGR;
1535 * clear aggr bits for every descriptor
1536 * XXX TODO: is there a way to optimize it?
1538 list_for_each_entry(tbf, &bf_q, list) {
1539 ath9k_hw_clr11n_aggr(sc->sc_ah, tbf->bf_desc);
1542 ath_buf_set_rate(sc, bf);
1543 ath_tx_txqaddbuf(sc, txq, &bf_q);
1548 * setup first desc with rate and aggr info
1550 bf->bf_state.bf_type |= BUF_AGGR;
1551 ath_buf_set_rate(sc, bf);
1552 ath9k_hw_set11n_aggr_first(sc->sc_ah, bf->bf_desc, bf->bf_al);
1555 * anchor last frame of aggregate correctly
1557 ASSERT(bf_lastaggr);
1558 ASSERT(bf_lastaggr->bf_lastfrm == bf_last);
1560 ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc);
1562 /* XXX: We don't enter into this loop, consider removing this */
1563 while (!list_empty(&bf_q) && !list_is_last(&tbf->list, &bf_q)) {
1564 tbf = list_entry(tbf->list.next, struct ath_buf, list);
1565 ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc);
1568 txq->axq_aggr_depth++;
1571 * Normal aggregate, queue to hardware
1573 ath_tx_txqaddbuf(sc, txq, &bf_q);
1575 } while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
1576 status != ATH_AGGR_BAW_CLOSED);
1579 /* Called with txq lock held */
1581 static void ath_tid_drain(struct ath_softc *sc,
1582 struct ath_txq *txq,
1583 struct ath_atx_tid *tid)
1587 struct list_head bf_head;
1588 INIT_LIST_HEAD(&bf_head);
1591 if (list_empty(&tid->buf_q))
1593 bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
1595 list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
1597 /* update baw for software retried frame */
1598 if (bf_isretried(bf))
1599 ath_tx_update_baw(sc, tid, bf->bf_seqno);
1602 * do not indicate packets while holding txq spinlock.
1603 * unlock is intentional here
1605 spin_unlock(&txq->axq_lock);
1607 /* complete this sub-frame */
1608 ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
1610 spin_lock(&txq->axq_lock);
1614 * TODO: For frame(s) that are in the retry state, we will reuse the
1615 * sequence number(s) without setting the retry bit. The
1616 * alternative is to give up on these and BAR the receiver's window
1619 tid->seq_next = tid->seq_start;
1620 tid->baw_tail = tid->baw_head;
1624 * Drain all pending buffers
1625 * NB: must be called with txq lock held
1627 static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
1628 struct ath_txq *txq)
1630 struct ath_atx_ac *ac, *ac_tmp;
1631 struct ath_atx_tid *tid, *tid_tmp;
1633 list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
1634 list_del(&ac->list);
1636 list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) {
1637 list_del(&tid->list);
1639 ath_tid_drain(sc, txq, tid);
1644 static void ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
1645 struct sk_buff *skb,
1646 struct ath_tx_control *txctl)
1648 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1649 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1650 struct ath_tx_info_priv *tx_info_priv;
1654 tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_KERNEL);
1655 tx_info->rate_driver_data[0] = tx_info_priv;
1656 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1657 fc = hdr->frame_control;
1659 ATH_TXBUF_RESET(bf);
1663 bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3);
1665 ieee80211_is_data(fc) ?
1666 (bf->bf_state.bf_type |= BUF_DATA) :
1667 (bf->bf_state.bf_type &= ~BUF_DATA);
1668 ieee80211_is_back_req(fc) ?
1669 (bf->bf_state.bf_type |= BUF_BAR) :
1670 (bf->bf_state.bf_type &= ~BUF_BAR);
1671 ieee80211_is_pspoll(fc) ?
1672 (bf->bf_state.bf_type |= BUF_PSPOLL) :
1673 (bf->bf_state.bf_type &= ~BUF_PSPOLL);
1674 (sc->sc_flags & SC_OP_PREAMBLE_SHORT) ?
1675 (bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE) :
1676 (bf->bf_state.bf_type &= ~BUF_SHORT_PREAMBLE);
1677 (sc->hw->conf.ht.enabled && !is_pae(skb) &&
1678 (tx_info->flags & IEEE80211_TX_CTL_AMPDU)) ?
1679 (bf->bf_state.bf_type |= BUF_HT) :
1680 (bf->bf_state.bf_type &= ~BUF_HT);
1682 bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq);
1686 bf->bf_keytype = get_hw_crypto_keytype(skb);
1688 if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {
1689 bf->bf_frmlen += tx_info->control.hw_key->icv_len;
1690 bf->bf_keyix = tx_info->control.hw_key->hw_key_idx;
1692 bf->bf_keyix = ATH9K_TXKEYIX_INVALID;
1695 /* Assign seqno, tidno */
1697 if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR))
1698 assign_aggr_tid_seqno(skb, bf);
1703 bf->bf_dmacontext = pci_map_single(sc->pdev, skb->data,
1704 skb->len, PCI_DMA_TODEVICE);
1705 bf->bf_buf_addr = bf->bf_dmacontext;
1708 /* FIXME: tx power */
1709 static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
1710 struct ath_tx_control *txctl)
1712 struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
1713 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
1714 struct ath_node *an = NULL;
1715 struct list_head bf_head;
1716 struct ath_desc *ds;
1717 struct ath_atx_tid *tid;
1718 struct ath_hal *ah = sc->sc_ah;
1721 frm_type = get_hw_packet_type(skb);
1723 INIT_LIST_HEAD(&bf_head);
1724 list_add_tail(&bf->list, &bf_head);
1726 /* setup descriptor */
1730 ds->ds_data = bf->bf_buf_addr;
1732 /* Formulate first tx descriptor with tx controls */
1734 ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER,
1735 bf->bf_keyix, bf->bf_keytype, bf->bf_flags);
1737 ath9k_hw_filltxdesc(ah, ds,
1738 skb->len, /* segment length */
1739 true, /* first segment */
1740 true, /* last segment */
1741 ds); /* first descriptor */
1743 bf->bf_lastfrm = bf;
1745 spin_lock_bh(&txctl->txq->axq_lock);
1747 if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) &&
1748 tx_info->control.sta) {
1749 an = (struct ath_node *)tx_info->control.sta->drv_priv;
1750 tid = ATH_AN_2_TID(an, bf->bf_tidno);
1752 if (ath_aggr_query(sc, an, bf->bf_tidno)) {
1754 * Try aggregation if it's a unicast data frame
1755 * and the destination is HT capable.
1757 ath_tx_send_ampdu(sc, tid, &bf_head, txctl);
1760 * Send this frame as regular when ADDBA
1761 * exchange is neither complete nor pending.
1763 ath_tx_send_normal(sc, txctl->txq,
1770 ath_buf_set_rate(sc, bf);
1771 ath_tx_txqaddbuf(sc, txctl->txq, &bf_head);
1774 spin_unlock_bh(&txctl->txq->axq_lock);
1777 int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
1778 struct ath_tx_control *txctl)
1782 /* Check if a tx buffer is available */
1784 bf = ath_tx_get_buffer(sc);
1786 DPRINTF(sc, ATH_DBG_XMIT, "TX buffers are full\n");
1790 ath_tx_setup_buffer(sc, bf, skb, txctl);
1791 ath_tx_start_dma(sc, bf, txctl);
1796 /* Initialize TX queue and h/w */
1798 int ath_tx_init(struct ath_softc *sc, int nbufs)
1803 spin_lock_init(&sc->sc_txbuflock);
1805 /* Setup tx descriptors */
1806 error = ath_descdma_setup(sc, &sc->sc_txdma, &sc->sc_txbuf,
1809 DPRINTF(sc, ATH_DBG_FATAL,
1810 "Failed to allocate tx descriptors: %d\n",
1815 /* XXX allocate beacon state together with vap */
1816 error = ath_descdma_setup(sc, &sc->sc_bdma, &sc->sc_bbuf,
1817 "beacon", ATH_BCBUF, 1);
1819 DPRINTF(sc, ATH_DBG_FATAL,
1820 "Failed to allocate beacon descriptors: %d\n",
1833 /* Reclaim all tx queue resources */
1835 int ath_tx_cleanup(struct ath_softc *sc)
1837 /* cleanup beacon descriptors */
1838 if (sc->sc_bdma.dd_desc_len != 0)
1839 ath_descdma_cleanup(sc, &sc->sc_bdma, &sc->sc_bbuf);
1841 /* cleanup tx descriptors */
1842 if (sc->sc_txdma.dd_desc_len != 0)
1843 ath_descdma_cleanup(sc, &sc->sc_txdma, &sc->sc_txbuf);
1848 /* Setup a h/w transmit queue */
1850 struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
1852 struct ath_hal *ah = sc->sc_ah;
1853 struct ath9k_tx_queue_info qi;
1856 memset(&qi, 0, sizeof(qi));
1857 qi.tqi_subtype = subtype;
1858 qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
1859 qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
1860 qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
1861 qi.tqi_physCompBuf = 0;
1864 * Enable interrupts only for EOL and DESC conditions.
1865 * We mark tx descriptors to receive a DESC interrupt
1866 * when a tx queue gets deep; otherwise waiting for the
1867 * EOL to reap descriptors. Note that this is done to
1868 * reduce interrupt load and this only defers reaping
1869 * descriptors, never transmitting frames. Aside from
1870 * reducing interrupts this also permits more concurrency.
1871 * The only potential downside is if the tx queue backs
1872 * up in which case the top half of the kernel may backup
1873 * due to a lack of tx descriptors.
1875 * The UAPSD queue is an exception, since we take a desc-
1876 * based intr on the EOSP frames.
1878 if (qtype == ATH9K_TX_QUEUE_UAPSD)
1879 qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE;
1881 qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |
1882 TXQ_FLAG_TXDESCINT_ENABLE;
1883 qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi);
1886 * NB: don't print a message, this happens
1887 * normally on parts with too few tx queues
1891 if (qnum >= ARRAY_SIZE(sc->sc_txq)) {
1892 DPRINTF(sc, ATH_DBG_FATAL,
1893 "qnum %u out of range, max %u!\n",
1894 qnum, (unsigned int)ARRAY_SIZE(sc->sc_txq));
1895 ath9k_hw_releasetxqueue(ah, qnum);
1898 if (!ATH_TXQ_SETUP(sc, qnum)) {
1899 struct ath_txq *txq = &sc->sc_txq[qnum];
1901 txq->axq_qnum = qnum;
1902 txq->axq_link = NULL;
1903 INIT_LIST_HEAD(&txq->axq_q);
1904 INIT_LIST_HEAD(&txq->axq_acq);
1905 spin_lock_init(&txq->axq_lock);
1907 txq->axq_aggr_depth = 0;
1908 txq->axq_totalqueued = 0;
1909 txq->axq_linkbuf = NULL;
1910 sc->sc_txqsetup |= 1<<qnum;
1912 return &sc->sc_txq[qnum];
1915 /* Reclaim resources for a setup queue */
1917 void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
1919 ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum);
1920 sc->sc_txqsetup &= ~(1<<txq->axq_qnum);
1924 * Setup a hardware data transmit queue for the specified
1925 * access control. The hal may not support all requested
1926 * queues in which case it will return a reference to a
1927 * previously setup queue. We record the mapping from ac's
1928 * to h/w queues for use by ath_tx_start and also track
1929 * the set of h/w queues being used to optimize work in the
1930 * transmit interrupt handler and related routines.
1933 int ath_tx_setup(struct ath_softc *sc, int haltype)
1935 struct ath_txq *txq;
1937 if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) {
1938 DPRINTF(sc, ATH_DBG_FATAL,
1939 "HAL AC %u out of range, max %zu!\n",
1940 haltype, ARRAY_SIZE(sc->sc_haltype2q));
1943 txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype);
1945 sc->sc_haltype2q[haltype] = txq->axq_qnum;
1951 int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype)
1956 case ATH9K_TX_QUEUE_DATA:
1957 if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) {
1958 DPRINTF(sc, ATH_DBG_FATAL,
1959 "HAL AC %u out of range, max %zu!\n",
1960 haltype, ARRAY_SIZE(sc->sc_haltype2q));
1963 qnum = sc->sc_haltype2q[haltype];
1965 case ATH9K_TX_QUEUE_BEACON:
1966 qnum = sc->sc_bhalq;
1968 case ATH9K_TX_QUEUE_CAB:
1969 qnum = sc->sc_cabq->axq_qnum;
1977 /* Get a transmit queue, if available */
1979 struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)
1981 struct ath_txq *txq = NULL;
1984 qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
1985 txq = &sc->sc_txq[qnum];
1987 spin_lock_bh(&txq->axq_lock);
1989 /* Try to avoid running out of descriptors */
1990 if (txq->axq_depth >= (ATH_TXBUF - 20)) {
1991 DPRINTF(sc, ATH_DBG_FATAL,
1992 "TX queue: %d is full, depth: %d\n",
1993 qnum, txq->axq_depth);
1994 ieee80211_stop_queue(sc->hw, skb_get_queue_mapping(skb));
1996 spin_unlock_bh(&txq->axq_lock);
2000 spin_unlock_bh(&txq->axq_lock);
2005 /* Update parameters for a transmit queue */
2007 int ath_txq_update(struct ath_softc *sc, int qnum,
2008 struct ath9k_tx_queue_info *qinfo)
2010 struct ath_hal *ah = sc->sc_ah;
2012 struct ath9k_tx_queue_info qi;
2014 if (qnum == sc->sc_bhalq) {
2016 * XXX: for beacon queue, we just save the parameter.
2017 * It will be picked up by ath_beaconq_config when
2020 sc->sc_beacon_qi = *qinfo;
2024 ASSERT(sc->sc_txq[qnum].axq_qnum == qnum);
2026 ath9k_hw_get_txq_props(ah, qnum, &qi);
2027 qi.tqi_aifs = qinfo->tqi_aifs;
2028 qi.tqi_cwmin = qinfo->tqi_cwmin;
2029 qi.tqi_cwmax = qinfo->tqi_cwmax;
2030 qi.tqi_burstTime = qinfo->tqi_burstTime;
2031 qi.tqi_readyTime = qinfo->tqi_readyTime;
2033 if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
2034 DPRINTF(sc, ATH_DBG_FATAL,
2035 "Unable to update hardware queue %u!\n", qnum);
2038 ath9k_hw_resettxqueue(ah, qnum); /* push to h/w */
2044 int ath_cabq_update(struct ath_softc *sc)
2046 struct ath9k_tx_queue_info qi;
2047 int qnum = sc->sc_cabq->axq_qnum;
2048 struct ath_beacon_config conf;
2050 ath9k_hw_get_txq_props(sc->sc_ah, qnum, &qi);
2052 * Ensure the readytime % is within the bounds.
2054 if (sc->sc_config.cabqReadytime < ATH9K_READY_TIME_LO_BOUND)
2055 sc->sc_config.cabqReadytime = ATH9K_READY_TIME_LO_BOUND;
2056 else if (sc->sc_config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND)
2057 sc->sc_config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND;
2059 ath_get_beaconconfig(sc, ATH_IF_ID_ANY, &conf);
2061 (conf.beacon_interval * sc->sc_config.cabqReadytime) / 100;
2062 ath_txq_update(sc, qnum, &qi);
2067 /* Deferred processing of transmit interrupt */
2069 void ath_tx_tasklet(struct ath_softc *sc)
2072 u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1);
2074 ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask);
2077 * Process each active queue.
2079 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2080 if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
2081 ath_tx_processq(sc, &sc->sc_txq[i]);
2085 void ath_tx_draintxq(struct ath_softc *sc,
2086 struct ath_txq *txq, bool retry_tx)
2088 struct ath_buf *bf, *lastbf;
2089 struct list_head bf_head;
2091 INIT_LIST_HEAD(&bf_head);
2094 * NB: this assumes output has been stopped and
2095 * we do not need to block ath_tx_tasklet
2098 spin_lock_bh(&txq->axq_lock);
2100 if (list_empty(&txq->axq_q)) {
2101 txq->axq_link = NULL;
2102 txq->axq_linkbuf = NULL;
2103 spin_unlock_bh(&txq->axq_lock);
2107 bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
2109 if (bf->bf_status & ATH_BUFSTATUS_STALE) {
2110 list_del(&bf->list);
2111 spin_unlock_bh(&txq->axq_lock);
2113 spin_lock_bh(&sc->sc_txbuflock);
2114 list_add_tail(&bf->list, &sc->sc_txbuf);
2115 spin_unlock_bh(&sc->sc_txbuflock);
2119 lastbf = bf->bf_lastbf;
2121 lastbf->bf_desc->ds_txstat.ts_flags =
2122 ATH9K_TX_SW_ABORTED;
2124 /* remove ath_buf's of the same mpdu from txq */
2125 list_cut_position(&bf_head, &txq->axq_q, &lastbf->list);
2128 spin_unlock_bh(&txq->axq_lock);
2131 ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, 0);
2133 ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
2136 /* flush any pending frames if aggregation is enabled */
2137 if (sc->sc_flags & SC_OP_TXAGGR) {
2139 spin_lock_bh(&txq->axq_lock);
2140 ath_txq_drain_pending_buffers(sc, txq);
2141 spin_unlock_bh(&txq->axq_lock);
2146 /* Drain the transmit queues and reclaim resources */
2148 void ath_draintxq(struct ath_softc *sc, bool retry_tx)
2150 /* stop beacon queue. The beacon will be freed when
2151 * we go to INIT state */
2152 if (!(sc->sc_flags & SC_OP_INVALID)) {
2153 (void) ath9k_hw_stoptxdma(sc->sc_ah, sc->sc_bhalq);
2154 DPRINTF(sc, ATH_DBG_XMIT, "beacon queue %x\n",
2155 ath9k_hw_gettxbuf(sc->sc_ah, sc->sc_bhalq));
2158 ath_drain_txdataq(sc, retry_tx);
2161 u32 ath_txq_depth(struct ath_softc *sc, int qnum)
2163 return sc->sc_txq[qnum].axq_depth;
2166 u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum)
2168 return sc->sc_txq[qnum].axq_aggr_depth;
2171 bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno)
2173 struct ath_atx_tid *txtid;
2175 if (!(sc->sc_flags & SC_OP_TXAGGR))
2178 txtid = ATH_AN_2_TID(an, tidno);
2180 if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
2181 if (!(txtid->state & AGGR_ADDBA_PROGRESS) &&
2182 (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) {
2183 txtid->addba_exchangeattempts++;
2191 /* Start TX aggregation */
2193 int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
2196 struct ath_atx_tid *txtid;
2197 struct ath_node *an;
2199 an = (struct ath_node *)sta->drv_priv;
2201 if (sc->sc_flags & SC_OP_TXAGGR) {
2202 txtid = ATH_AN_2_TID(an, tid);
2203 txtid->state |= AGGR_ADDBA_PROGRESS;
2204 ath_tx_pause_tid(sc, txtid);
2210 /* Stop tx aggregation */
2212 int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
2214 struct ath_node *an = (struct ath_node *)sta->drv_priv;
2216 ath_tx_aggr_teardown(sc, an, tid);
2220 /* Resume tx aggregation */
2222 void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
2224 struct ath_atx_tid *txtid;
2225 struct ath_node *an;
2227 an = (struct ath_node *)sta->drv_priv;
2229 if (sc->sc_flags & SC_OP_TXAGGR) {
2230 txtid = ATH_AN_2_TID(an, tid);
2232 IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
2233 txtid->state |= AGGR_ADDBA_COMPLETE;
2234 txtid->state &= ~AGGR_ADDBA_PROGRESS;
2235 ath_tx_resume_tid(sc, txtid);
2240 * Performs transmit side cleanup when TID changes from aggregated to
2242 * - Pause the TID and mark cleanup in progress
2243 * - Discard all retry frames from the s/w queue.
2246 void ath_tx_aggr_teardown(struct ath_softc *sc, struct ath_node *an, u8 tid)
2248 struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
2249 struct ath_txq *txq = &sc->sc_txq[txtid->ac->qnum];
2251 struct list_head bf_head;
2252 INIT_LIST_HEAD(&bf_head);
2254 if (txtid->state & AGGR_CLEANUP) /* cleanup is in progress */
2257 if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
2258 txtid->addba_exchangeattempts = 0;
2262 /* TID must be paused first */
2263 ath_tx_pause_tid(sc, txtid);
2265 /* drop all software retried frames and mark this TID */
2266 spin_lock_bh(&txq->axq_lock);
2267 while (!list_empty(&txtid->buf_q)) {
2268 bf = list_first_entry(&txtid->buf_q, struct ath_buf, list);
2269 if (!bf_isretried(bf)) {
2271 * NB: it's based on the assumption that
2272 * software retried frame will always stay
2273 * at the head of software queue.
2277 list_cut_position(&bf_head,
2278 &txtid->buf_q, &bf->bf_lastfrm->list);
2279 ath_tx_update_baw(sc, txtid, bf->bf_seqno);
2281 /* complete this sub-frame */
2282 ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
2285 if (txtid->baw_head != txtid->baw_tail) {
2286 spin_unlock_bh(&txq->axq_lock);
2287 txtid->state |= AGGR_CLEANUP;
2289 txtid->state &= ~AGGR_ADDBA_COMPLETE;
2290 txtid->addba_exchangeattempts = 0;
2291 spin_unlock_bh(&txq->axq_lock);
2292 ath_tx_flush_tid(sc, txtid);
2297 * Tx scheduling logic
2298 * NB: must be called with txq lock held
2301 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
2303 struct ath_atx_ac *ac;
2304 struct ath_atx_tid *tid;
2306 /* nothing to schedule */
2307 if (list_empty(&txq->axq_acq))
2310 * get the first node/ac pair on the queue
2312 ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
2313 list_del(&ac->list);
2317 * process a single tid per destination
2320 /* nothing to schedule */
2321 if (list_empty(&ac->tid_q))
2324 tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list);
2325 list_del(&tid->list);
2328 if (tid->paused) /* check next tid to keep h/w busy */
2331 if ((txq->axq_depth % 2) == 0)
2332 ath_tx_sched_aggr(sc, txq, tid);
2335 * add tid to round-robin queue if more frames
2336 * are pending for the tid
2338 if (!list_empty(&tid->buf_q))
2339 ath_tx_queue_tid(txq, tid);
2341 /* only schedule one TID at a time */
2343 } while (!list_empty(&ac->tid_q));
2346 * schedule AC if more TIDs need processing
2348 if (!list_empty(&ac->tid_q)) {
2350 * add dest ac to txq if not already added
2354 list_add_tail(&ac->list, &txq->axq_acq);
2359 /* Initialize per-node transmit state */
2361 void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
2363 struct ath_atx_tid *tid;
2364 struct ath_atx_ac *ac;
2368 * Init per tid tx state
2370 for (tidno = 0, tid = &an->an_aggr.tx.tid[tidno];
2371 tidno < WME_NUM_TID;
2375 tid->seq_start = tid->seq_next = 0;
2376 tid->baw_size = WME_MAX_BA;
2377 tid->baw_head = tid->baw_tail = 0;
2379 tid->paused = false;
2380 tid->state &= ~AGGR_CLEANUP;
2381 INIT_LIST_HEAD(&tid->buf_q);
2383 acno = TID_TO_WME_AC(tidno);
2384 tid->ac = &an->an_aggr.tx.ac[acno];
2387 tid->state &= ~AGGR_ADDBA_COMPLETE;
2388 tid->state &= ~AGGR_ADDBA_PROGRESS;
2389 tid->addba_exchangeattempts = 0;
2393 * Init per ac tx state
2395 for (acno = 0, ac = &an->an_aggr.tx.ac[acno];
2396 acno < WME_NUM_AC; acno++, ac++) {
2398 INIT_LIST_HEAD(&ac->tid_q);
2402 ac->qnum = ath_tx_get_qnum(sc,
2403 ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE);
2406 ac->qnum = ath_tx_get_qnum(sc,
2407 ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BK);
2410 ac->qnum = ath_tx_get_qnum(sc,
2411 ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VI);
2414 ac->qnum = ath_tx_get_qnum(sc,
2415 ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VO);
2421 /* Cleanupthe pending buffers for the node. */
2423 void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
2426 struct ath_atx_ac *ac, *ac_tmp;
2427 struct ath_atx_tid *tid, *tid_tmp;
2428 struct ath_txq *txq;
2429 for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
2430 if (ATH_TXQ_SETUP(sc, i)) {
2431 txq = &sc->sc_txq[i];
2433 spin_lock(&txq->axq_lock);
2435 list_for_each_entry_safe(ac,
2436 ac_tmp, &txq->axq_acq, list) {
2437 tid = list_first_entry(&ac->tid_q,
2438 struct ath_atx_tid, list);
2439 if (tid && tid->an != an)
2441 list_del(&ac->list);
2444 list_for_each_entry_safe(tid,
2445 tid_tmp, &ac->tid_q, list) {
2446 list_del(&tid->list);
2448 ath_tid_drain(sc, txq, tid);
2449 tid->state &= ~AGGR_ADDBA_COMPLETE;
2450 tid->addba_exchangeattempts = 0;
2451 tid->state &= ~AGGR_CLEANUP;
2455 spin_unlock(&txq->axq_lock);
2460 void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb)
2462 int hdrlen, padsize;
2463 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2464 struct ath_tx_control txctl;
2466 memset(&txctl, 0, sizeof(struct ath_tx_control));
2469 * As a temporary workaround, assign seq# here; this will likely need
2470 * to be cleaned up to work better with Beacon transmission and virtual
2473 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
2474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2475 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
2477 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
2478 hdr->seq_ctrl |= cpu_to_le16(sc->seq_no);
2481 /* Add the padding after the header if this is not already done */
2482 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
2484 padsize = hdrlen % 4;
2485 if (skb_headroom(skb) < padsize) {
2486 DPRINTF(sc, ATH_DBG_XMIT, "TX CABQ padding failed\n");
2487 dev_kfree_skb_any(skb);
2490 skb_push(skb, padsize);
2491 memmove(skb->data, skb->data + padsize, hdrlen);
2494 txctl.txq = sc->sc_cabq;
2496 DPRINTF(sc, ATH_DBG_XMIT, "transmitting CABQ packet, skb: %p\n", skb);
2498 if (ath_tx_start(sc, skb, &txctl) != 0) {
2499 DPRINTF(sc, ATH_DBG_XMIT, "CABQ TX failed\n");
2505 dev_kfree_skb_any(skb);