--- /dev/null
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/dma-mapping.h>
+#include "ath9k.h"
+#include "ar9003_mac.h"
+
+#define BITS_PER_BYTE 8
+#define OFDM_PLCP_BITS 22
+#define HT_RC_2_STREAMS(_rc) ((((_rc) & 0x78) >> 3) + 1)
+#define L_STF 8
+#define L_LTF 8
+#define L_SIG 4
+#define HT_SIG 8
+#define HT_STF 4
+#define HT_LTF(_ns) (4 * (_ns))
+#define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */
+#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */
+#define TIME_SYMBOLS(t) ((t) >> 2)
+#define TIME_SYMBOLS_HALFGI(t) (((t) * 5 - 4) / 18)
+#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
+#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
+
+
+static u16 bits_per_symbol[][2] = {
+ /* 20MHz 40MHz */
+ { 26, 54 }, /* 0: BPSK */
+ { 52, 108 }, /* 1: QPSK 1/2 */
+ { 78, 162 }, /* 2: QPSK 3/4 */
+ { 104, 216 }, /* 3: 16-QAM 1/2 */
+ { 156, 324 }, /* 4: 16-QAM 3/4 */
+ { 208, 432 }, /* 5: 64-QAM 2/3 */
+ { 234, 486 }, /* 6: 64-QAM 3/4 */
+ { 260, 540 }, /* 7: 64-QAM 5/6 */
+};
+
+static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, struct sk_buff *skb);
+static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
+ int tx_flags, struct ath_txq *txq);
+static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_txq *txq, struct list_head *bf_q,
+ struct ath_tx_status *ts, int txok);
+static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
+ struct list_head *head, bool internal);
+static void ath_tx_rc_status(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_tx_status *ts, int nframes, int nbad,
+ int txok);
+static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
+ int seqno);
+static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct sk_buff *skb);
+
+enum {
+ MCS_HT20,
+ MCS_HT20_SGI,
+ MCS_HT40,
+ MCS_HT40_SGI,
+};
+
+/*********************/
+/* Aggregation logic */
+/*********************/
+
+void ath_txq_lock(struct ath_softc *sc, struct ath_txq *txq)
+ __acquires(&txq->axq_lock)
+{
+ spin_lock_bh(&txq->axq_lock);
+}
+
+void ath_txq_unlock(struct ath_softc *sc, struct ath_txq *txq)
+ __releases(&txq->axq_lock)
+{
+ spin_unlock_bh(&txq->axq_lock);
+}
+
+void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq)
+ __releases(&txq->axq_lock)
+{
+ struct sk_buff_head q;
+ struct sk_buff *skb;
+
+ __skb_queue_head_init(&q);
+ skb_queue_splice_init(&txq->complete_q, &q);
+ spin_unlock_bh(&txq->axq_lock);
+
+ while ((skb = __skb_dequeue(&q)))
+ ieee80211_tx_status(sc->hw, skb);
+}
+
+static void ath_tx_queue_tid(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid)
+{
+ struct ath_atx_ac *ac = tid->ac;
+ struct list_head *list;
+ struct ath_vif *avp = (struct ath_vif *) tid->an->vif->drv_priv;
+ struct ath_chanctx *ctx = avp->chanctx;
+
+ if (!ctx)
+ return;
+
+ if (tid->sched)
+ return;
+
+ tid->sched = true;
+ list_add_tail(&tid->list, &ac->tid_q);
+
+ if (ac->sched)
+ return;
+
+ ac->sched = true;
+
+ list = &ctx->acq[TID_TO_WME_AC(tid->tidno)];
+ list_add_tail(&ac->list, list);
+}
+
+static struct ath_frame_info *get_frame_info(struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ BUILD_BUG_ON(sizeof(struct ath_frame_info) >
+ sizeof(tx_info->rate_driver_data));
+ return (struct ath_frame_info *) &tx_info->rate_driver_data[0];
+}
+
+static void ath_send_bar(struct ath_atx_tid *tid, u16 seqno)
+{
+ if (!tid->an->sta)
+ return;
+
+ ieee80211_send_bar(tid->an->vif, tid->an->sta->addr, tid->tidno,
+ seqno << IEEE80211_SEQ_SEQ_SHIFT);
+}
+
+static void ath_set_rates(struct ieee80211_vif *vif, struct ieee80211_sta *sta,
+ struct ath_buf *bf)
+{
+ ieee80211_get_tx_rates(vif, sta, bf->bf_mpdu, bf->rates,
+ ARRAY_SIZE(bf->rates));
+}
+
+static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
+ struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ath_frame_info *fi = get_frame_info(skb);
+ int q = fi->txq;
+
+ if (q < 0)
+ return;
+
+ txq = sc->tx.txq_map[q];
+ if (WARN_ON(--txq->pending_frames < 0))
+ txq->pending_frames = 0;
+
+ if (txq->stopped &&
+ txq->pending_frames < sc->tx.txq_max_pending[q]) {
+ if (ath9k_is_chanctx_enabled())
+ ieee80211_wake_queue(sc->hw, info->hw_queue);
+ else
+ ieee80211_wake_queue(sc->hw, q);
+ txq->stopped = false;
+ }
+}
+
+static struct ath_atx_tid *
+ath_get_skb_tid(struct ath_softc *sc, struct ath_node *an, struct sk_buff *skb)
+{
+ u8 tidno = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
+ return ATH_AN_2_TID(an, tidno);
+}
+
+static bool ath_tid_has_buffered(struct ath_atx_tid *tid)
+{
+ return !skb_queue_empty(&tid->buf_q) || !skb_queue_empty(&tid->retry_q);
+}
+
+static struct sk_buff *ath_tid_dequeue(struct ath_atx_tid *tid)
+{
+ struct sk_buff *skb;
+
+ skb = __skb_dequeue(&tid->retry_q);
+ if (!skb)
+ skb = __skb_dequeue(&tid->buf_q);
+
+ return skb;
+}
+
+/*
+ * ath_tx_tid_change_state:
+ * - clears a-mpdu flag of previous session
+ * - force sequence number allocation to fix next BlockAck Window
+ */
+static void
+ath_tx_tid_change_state(struct ath_softc *sc, struct ath_atx_tid *tid)
+{
+ struct ath_txq *txq = tid->ac->txq;
+ struct ieee80211_tx_info *tx_info;
+ struct sk_buff *skb, *tskb;
+ struct ath_buf *bf;
+ struct ath_frame_info *fi;
+
+ skb_queue_walk_safe(&tid->buf_q, skb, tskb) {
+ fi = get_frame_info(skb);
+ bf = fi->bf;
+
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info->flags &= ~IEEE80211_TX_CTL_AMPDU;
+
+ if (bf)
+ continue;
+
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ if (!bf) {
+ __skb_unlink(skb, &tid->buf_q);
+ ath_txq_skb_done(sc, txq, skb);
+ ieee80211_free_txskb(sc->hw, skb);
+ continue;
+ }
+ }
+
+}
+
+static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+{
+ struct ath_txq *txq = tid->ac->txq;
+ struct sk_buff *skb;
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ struct ath_tx_status ts;
+ struct ath_frame_info *fi;
+ bool sendbar = false;
+
+ INIT_LIST_HEAD(&bf_head);
+
+ memset(&ts, 0, sizeof(ts));
+
+ while ((skb = __skb_dequeue(&tid->retry_q))) {
+ fi = get_frame_info(skb);
+ bf = fi->bf;
+ if (!bf) {
+ ath_txq_skb_done(sc, txq, skb);
+ ieee80211_free_txskb(sc->hw, skb);
+ continue;
+ }
+
+ if (fi->baw_tracked) {
+ ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
+ sendbar = true;
+ }
+
+ list_add_tail(&bf->list, &bf_head);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ }
+
+ if (sendbar) {
+ ath_txq_unlock(sc, txq);
+ ath_send_bar(tid, tid->seq_start);
+ ath_txq_lock(sc, txq);
+ }
+}
+
+static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
+ int seqno)
+{
+ int index, cindex;
+
+ index = ATH_BA_INDEX(tid->seq_start, seqno);
+ cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
+
+ __clear_bit(cindex, tid->tx_buf);
+
+ while (tid->baw_head != tid->baw_tail && !test_bit(tid->baw_head, tid->tx_buf)) {
+ INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+ INCR(tid->baw_head, ATH_TID_MAX_BUFS);
+ if (tid->bar_index >= 0)
+ tid->bar_index--;
+ }
+}
+
+static void ath_tx_addto_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
+ struct ath_buf *bf)
+{
+ struct ath_frame_info *fi = get_frame_info(bf->bf_mpdu);
+ u16 seqno = bf->bf_state.seqno;
+ int index, cindex;
+
+ index = ATH_BA_INDEX(tid->seq_start, seqno);
+ cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
+ __set_bit(cindex, tid->tx_buf);
+ fi->baw_tracked = 1;
+
+ if (index >= ((tid->baw_tail - tid->baw_head) &
+ (ATH_TID_MAX_BUFS - 1))) {
+ tid->baw_tail = cindex;
+ INCR(tid->baw_tail, ATH_TID_MAX_BUFS);
+ }
+}
+
+static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid)
+
+{
+ struct sk_buff *skb;
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ struct ath_tx_status ts;
+ struct ath_frame_info *fi;
+
+ memset(&ts, 0, sizeof(ts));
+ INIT_LIST_HEAD(&bf_head);
+
+ while ((skb = ath_tid_dequeue(tid))) {
+ fi = get_frame_info(skb);
+ bf = fi->bf;
+
+ if (!bf) {
+ ath_tx_complete(sc, skb, ATH_TX_ERROR, txq);
+ continue;
+ }
+
+ list_add_tail(&bf->list, &bf_head);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ }
+}
+
+static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
+ struct sk_buff *skb, int count)
+{
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct ath_buf *bf = fi->bf;
+ struct ieee80211_hdr *hdr;
+ int prev = fi->retries;
+
+ TX_STAT_INC(txq->axq_qnum, a_retries);
+ fi->retries += count;
+
+ if (prev > 0)
+ return;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
+ dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
+ sizeof(*hdr), DMA_TO_DEVICE);
+}
+
+static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
+{
+ struct ath_buf *bf = NULL;
+
+ spin_lock_bh(&sc->tx.txbuflock);
+
+ if (unlikely(list_empty(&sc->tx.txbuf))) {
+ spin_unlock_bh(&sc->tx.txbuflock);
+ return NULL;
+ }
+
+ bf = list_first_entry(&sc->tx.txbuf, struct ath_buf, list);
+ list_del(&bf->list);
+
+ spin_unlock_bh(&sc->tx.txbuflock);
+
+ return bf;
+}
+
+static void ath_tx_return_buffer(struct ath_softc *sc, struct ath_buf *bf)
+{
+ spin_lock_bh(&sc->tx.txbuflock);
+ list_add_tail(&bf->list, &sc->tx.txbuf);
+ spin_unlock_bh(&sc->tx.txbuflock);
+}
+
+static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
+{
+ struct ath_buf *tbf;
+
+ tbf = ath_tx_get_buffer(sc);
+ if (WARN_ON(!tbf))
+ return NULL;
+
+ ATH_TXBUF_RESET(tbf);
+
+ tbf->bf_mpdu = bf->bf_mpdu;
+ tbf->bf_buf_addr = bf->bf_buf_addr;
+ memcpy(tbf->bf_desc, bf->bf_desc, sc->sc_ah->caps.tx_desc_len);
+ tbf->bf_state = bf->bf_state;
+ tbf->bf_state.stale = false;
+
+ return tbf;
+}
+
+static void ath_tx_count_frames(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_tx_status *ts, int txok,
+ int *nframes, int *nbad)
+{
+ struct ath_frame_info *fi;
+ u16 seq_st = 0;
+ u32 ba[WME_BA_BMP_SIZE >> 5];
+ int ba_index;
+ int isaggr = 0;
+
+ *nbad = 0;
+ *nframes = 0;
+
+ isaggr = bf_isaggr(bf);
+ if (isaggr) {
+ seq_st = ts->ts_seqnum;
+ memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
+ }
+
+ while (bf) {
+ fi = get_frame_info(bf->bf_mpdu);
+ ba_index = ATH_BA_INDEX(seq_st, bf->bf_state.seqno);
+
+ (*nframes)++;
+ if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
+ (*nbad)++;
+
+ bf = bf->bf_next;
+ }
+}
+
+
+static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_buf *bf, struct list_head *bf_q,
+ struct ath_tx_status *ts, int txok)
+{
+ struct ath_node *an = NULL;
+ struct sk_buff *skb;
+ struct ieee80211_sta *sta;
+ struct ieee80211_hw *hw = sc->hw;
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_atx_tid *tid = NULL;
+ struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
+ struct list_head bf_head;
+ struct sk_buff_head bf_pending;
+ u16 seq_st = 0, acked_cnt = 0, txfail_cnt = 0, seq_first;
+ u32 ba[WME_BA_BMP_SIZE >> 5];
+ int isaggr, txfail, txpending, sendbar = 0, needreset = 0, nbad = 0;
+ bool rc_update = true, isba;
+ struct ieee80211_tx_rate rates[4];
+ struct ath_frame_info *fi;
+ int nframes;
+ bool flush = !!(ts->ts_status & ATH9K_TX_FLUSH);
+ int i, retries;
+ int bar_index = -1;
+
+ skb = bf->bf_mpdu;
+ hdr = (struct ieee80211_hdr *)skb->data;
+
+ tx_info = IEEE80211_SKB_CB(skb);
+
+ memcpy(rates, bf->rates, sizeof(rates));
+
+ retries = ts->ts_longretry + 1;
+ for (i = 0; i < ts->ts_rateindex; i++)
+ retries += rates[i].count;
+
+ rcu_read_lock();
+
+ sta = ieee80211_find_sta_by_ifaddr(hw, hdr->addr1, hdr->addr2);
+ if (!sta) {
+ rcu_read_unlock();
+
+ INIT_LIST_HEAD(&bf_head);
+ while (bf) {
+ bf_next = bf->bf_next;
+
+ if (!bf->bf_state.stale || bf_next != NULL)
+ list_move_tail(&bf->list, &bf_head);
+
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, ts, 0);
+
+ bf = bf_next;
+ }
+ return;
+ }
+
+ an = (struct ath_node *)sta->drv_priv;
+ tid = ath_get_skb_tid(sc, an, skb);
+ seq_first = tid->seq_start;
+ isba = ts->ts_flags & ATH9K_TX_BA;
+
+ /*
+ * The hardware occasionally sends a tx status for the wrong TID.
+ * In this case, the BA status cannot be considered valid and all
+ * subframes need to be retransmitted
+ *
+ * Only BlockAcks have a TID and therefore normal Acks cannot be
+ * checked
+ */
+ if (isba && tid->tidno != ts->tid)
+ txok = false;
+
+ isaggr = bf_isaggr(bf);
+ memset(ba, 0, WME_BA_BMP_SIZE >> 3);
+
+ if (isaggr && txok) {
+ if (ts->ts_flags & ATH9K_TX_BA) {
+ seq_st = ts->ts_seqnum;
+ memcpy(ba, &ts->ba_low, WME_BA_BMP_SIZE >> 3);
+ } else {
+ /*
+ * AR5416 can become deaf/mute when BA
+ * issue happens. Chip needs to be reset.
+ * But AP code may have sychronization issues
+ * when perform internal reset in this routine.
+ * Only enable reset in STA mode for now.
+ */
+ if (sc->sc_ah->opmode == NL80211_IFTYPE_STATION)
+ needreset = 1;
+ }
+ }
+
+ __skb_queue_head_init(&bf_pending);
+
+ ath_tx_count_frames(sc, bf, ts, txok, &nframes, &nbad);
+ while (bf) {
+ u16 seqno = bf->bf_state.seqno;
+
+ txfail = txpending = sendbar = 0;
+ bf_next = bf->bf_next;
+
+ skb = bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ fi = get_frame_info(skb);
+
+ if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno) ||
+ !tid->active) {
+ /*
+ * Outside of the current BlockAck window,
+ * maybe part of a previous session
+ */
+ txfail = 1;
+ } else if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, seqno))) {
+ /* transmit completion, subframe is
+ * acked by block ack */
+ acked_cnt++;
+ } else if (!isaggr && txok) {
+ /* transmit completion */
+ acked_cnt++;
+ } else if (flush) {
+ txpending = 1;
+ } else if (fi->retries < ATH_MAX_SW_RETRIES) {
+ if (txok || !an->sleeping)
+ ath_tx_set_retry(sc, txq, bf->bf_mpdu,
+ retries);
+
+ txpending = 1;
+ } else {
+ txfail = 1;
+ txfail_cnt++;
+ bar_index = max_t(int, bar_index,
+ ATH_BA_INDEX(seq_first, seqno));
+ }
+
+ /*
+ * Make sure the last desc is reclaimed if it
+ * not a holding desc.
+ */
+ INIT_LIST_HEAD(&bf_head);
+ if (bf_next != NULL || !bf_last->bf_state.stale)
+ list_move_tail(&bf->list, &bf_head);
+
+ if (!txpending) {
+ /*
+ * complete the acked-ones/xretried ones; update
+ * block-ack window
+ */
+ ath_tx_update_baw(sc, tid, seqno);
+
+ if (rc_update && (acked_cnt == 1 || txfail_cnt == 1)) {
+ memcpy(tx_info->control.rates, rates, sizeof(rates));
+ ath_tx_rc_status(sc, bf, ts, nframes, nbad, txok);
+ rc_update = false;
+ if (bf == bf->bf_lastbf)
+ ath_dynack_sample_tx_ts(sc->sc_ah,
+ bf->bf_mpdu,
+ ts);
+ }
+
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, ts,
+ !txfail);
+ } else {
+ if (tx_info->flags & IEEE80211_TX_STATUS_EOSP) {
+ tx_info->flags &= ~IEEE80211_TX_STATUS_EOSP;
+ ieee80211_sta_eosp(sta);
+ }
+ /* retry the un-acked ones */
+ if (bf->bf_next == NULL && bf_last->bf_state.stale) {
+ struct ath_buf *tbf;
+
+ tbf = ath_clone_txbuf(sc, bf_last);
+ /*
+ * Update tx baw and complete the
+ * frame with failed status if we
+ * run out of tx buf.
+ */
+ if (!tbf) {
+ ath_tx_update_baw(sc, tid, seqno);
+
+ ath_tx_complete_buf(sc, bf, txq,
+ &bf_head, ts, 0);
+ bar_index = max_t(int, bar_index,
+ ATH_BA_INDEX(seq_first, seqno));
+ break;
+ }
+
+ fi->bf = tbf;
+ }
+
+ /*
+ * Put this buffer to the temporary pending
+ * queue to retain ordering
+ */
+ __skb_queue_tail(&bf_pending, skb);
+ }
+
+ bf = bf_next;
+ }
+
+ /* prepend un-acked frames to the beginning of the pending frame queue */
+ if (!skb_queue_empty(&bf_pending)) {
+ if (an->sleeping)
+ ieee80211_sta_set_buffered(sta, tid->tidno, true);
+
+ skb_queue_splice_tail(&bf_pending, &tid->retry_q);
+ if (!an->sleeping) {
+ ath_tx_queue_tid(sc, txq, tid);
+
+ if (ts->ts_status & (ATH9K_TXERR_FILT | ATH9K_TXERR_XRETRY))
+ tid->ac->clear_ps_filter = true;
+ }
+ }
+
+ if (bar_index >= 0) {
+ u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
+
+ if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
+ tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
+
+ ath_txq_unlock(sc, txq);
+ ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
+ ath_txq_lock(sc, txq);
+ }
+
+ rcu_read_unlock();
+
+ if (needreset)
+ ath9k_queue_reset(sc, RESET_TYPE_TX_ERROR);
+}
+
+static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(bf->bf_mpdu);
+ return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
+}
+
+static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_tx_status *ts, struct ath_buf *bf,
+ struct list_head *bf_head)
+{
+ struct ieee80211_tx_info *info;
+ bool txok, flush;
+
+ txok = !(ts->ts_status & ATH9K_TXERR_MASK);
+ flush = !!(ts->ts_status & ATH9K_TX_FLUSH);
+ txq->axq_tx_inprogress = false;
+
+ txq->axq_depth--;
+ if (bf_is_ampdu_not_probing(bf))
+ txq->axq_ampdu_depth--;
+
+ ts->duration = ath9k_hw_get_duration(sc->sc_ah, bf->bf_desc,
+ ts->ts_rateindex);
+ if (!bf_isampdu(bf)) {
+ if (!flush) {
+ info = IEEE80211_SKB_CB(bf->bf_mpdu);
+ memcpy(info->control.rates, bf->rates,
+ sizeof(info->control.rates));
+ ath_tx_rc_status(sc, bf, ts, 1, txok ? 0 : 1, txok);
+ ath_dynack_sample_tx_ts(sc->sc_ah, bf->bf_mpdu, ts);
+ }
+ ath_tx_complete_buf(sc, bf, txq, bf_head, ts, txok);
+ } else
+ ath_tx_complete_aggr(sc, txq, bf, bf_head, ts, txok);
+
+ if (!flush)
+ ath_txq_schedule(sc, txq);
+}
+
+static bool ath_lookup_legacy(struct ath_buf *bf)
+{
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ieee80211_tx_rate *rates;
+ int i;
+
+ skb = bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ rates = tx_info->control.rates;
+
+ for (i = 0; i < 4; i++) {
+ if (!rates[i].count || rates[i].idx < 0)
+ break;
+
+ if (!(rates[i].flags & IEEE80211_TX_RC_MCS))
+ return true;
+ }
+
+ return false;
+}
+
+static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_atx_tid *tid)
+{
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ieee80211_tx_rate *rates;
+ u32 max_4ms_framelen, frmlen;
+ u16 aggr_limit, bt_aggr_limit, legacy = 0;
+ int q = tid->ac->txq->mac80211_qnum;
+ int i;
+
+ skb = bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ rates = bf->rates;
+
+ /*
+ * Find the lowest frame length among the rate series that will have a
+ * 4ms (or TXOP limited) transmit duration.
+ */
+ max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
+
+ for (i = 0; i < 4; i++) {
+ int modeidx;
+
+ if (!rates[i].count)
+ continue;
+
+ if (!(rates[i].flags & IEEE80211_TX_RC_MCS)) {
+ legacy = 1;
+ break;
+ }
+
+ if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ modeidx = MCS_HT40;
+ else
+ modeidx = MCS_HT20;
+
+ if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
+ modeidx++;
+
+ frmlen = sc->tx.max_aggr_framelen[q][modeidx][rates[i].idx];
+ max_4ms_framelen = min(max_4ms_framelen, frmlen);
+ }
+
+ /*
+ * limit aggregate size by the minimum rate if rate selected is
+ * not a probe rate, if rate selected is a probe rate then
+ * avoid aggregation of this packet.
+ */
+ if (tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE || legacy)
+ return 0;
+
+ aggr_limit = min(max_4ms_framelen, (u32)ATH_AMPDU_LIMIT_MAX);
+
+ /*
+ * Override the default aggregation limit for BTCOEX.
+ */
+ bt_aggr_limit = ath9k_btcoex_aggr_limit(sc, max_4ms_framelen);
+ if (bt_aggr_limit)
+ aggr_limit = bt_aggr_limit;
+
+ if (tid->an->maxampdu)
+ aggr_limit = min(aggr_limit, tid->an->maxampdu);
+
+ return aggr_limit;
+}
+
+/*
+ * Returns the number of delimiters to be added to
+ * meet the minimum required mpdudensity.
+ */
+static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
+ struct ath_buf *bf, u16 frmlen,
+ bool first_subfrm)
+{
+#define FIRST_DESC_NDELIMS 60
+ u32 nsymbits, nsymbols;
+ u16 minlen;
+ u8 flags, rix;
+ int width, streams, half_gi, ndelim, mindelim;
+ struct ath_frame_info *fi = get_frame_info(bf->bf_mpdu);
+
+ /* Select standard number of delimiters based on frame length alone */
+ ndelim = ATH_AGGR_GET_NDELIM(frmlen);
+
+ /*
+ * If encryption enabled, hardware requires some more padding between
+ * subframes.
+ * TODO - this could be improved to be dependent on the rate.
+ * The hardware can keep up at lower rates, but not higher rates
+ */
+ if ((fi->keyix != ATH9K_TXKEYIX_INVALID) &&
+ !(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA))
+ ndelim += ATH_AGGR_ENCRYPTDELIM;
+
+ /*
+ * Add delimiter when using RTS/CTS with aggregation
+ * and non enterprise AR9003 card
+ */
+ if (first_subfrm && !AR_SREV_9580_10_OR_LATER(sc->sc_ah) &&
+ (sc->sc_ah->ent_mode & AR_ENT_OTP_MIN_PKT_SIZE_DISABLE))
+ ndelim = max(ndelim, FIRST_DESC_NDELIMS);
+
+ /*
+ * Convert desired mpdu density from microeconds to bytes based
+ * on highest rate in rate series (i.e. first rate) to determine
+ * required minimum length for subframe. Take into account
+ * whether high rate is 20 or 40Mhz and half or full GI.
+ *
+ * If there is no mpdu density restriction, no further calculation
+ * is needed.
+ */
+
+ if (tid->an->mpdudensity == 0)
+ return ndelim;
+
+ rix = bf->rates[0].idx;
+ flags = bf->rates[0].flags;
+ width = (flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ? 1 : 0;
+ half_gi = (flags & IEEE80211_TX_RC_SHORT_GI) ? 1 : 0;
+
+ if (half_gi)
+ nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(tid->an->mpdudensity);
+ else
+ nsymbols = NUM_SYMBOLS_PER_USEC(tid->an->mpdudensity);
+
+ if (nsymbols == 0)
+ nsymbols = 1;
+
+ streams = HT_RC_2_STREAMS(rix);
+ nsymbits = bits_per_symbol[rix % 8][width] * streams;
+ minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
+
+ if (frmlen < minlen) {
+ mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ;
+ ndelim = max(mindelim, ndelim);
+ }
+
+ return ndelim;
+}
+
+static struct ath_buf *
+ath_tx_get_tid_subframe(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, struct sk_buff_head **q)
+{
+ struct ieee80211_tx_info *tx_info;
+ struct ath_frame_info *fi;
+ struct sk_buff *skb;
+ struct ath_buf *bf;
+ u16 seqno;
+
+ while (1) {
+ *q = &tid->retry_q;
+ if (skb_queue_empty(*q))
+ *q = &tid->buf_q;
+
+ skb = skb_peek(*q);
+ if (!skb)
+ break;
+
+ fi = get_frame_info(skb);
+ bf = fi->bf;
+ if (!fi->bf)
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ else
+ bf->bf_state.stale = false;
+
+ if (!bf) {
+ __skb_unlink(skb, *q);
+ ath_txq_skb_done(sc, txq, skb);
+ ieee80211_free_txskb(sc->hw, skb);
+ continue;
+ }
+
+ bf->bf_next = NULL;
+ bf->bf_lastbf = bf;
+
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info->flags &= ~IEEE80211_TX_CTL_CLEAR_PS_FILT;
+
+ /*
+ * No aggregation session is running, but there may be frames
+ * from a previous session or a failed attempt in the queue.
+ * Send them out as normal data frames
+ */
+ if (!tid->active)
+ tx_info->flags &= ~IEEE80211_TX_CTL_AMPDU;
+
+ if (!(tx_info->flags & IEEE80211_TX_CTL_AMPDU)) {
+ bf->bf_state.bf_type = 0;
+ return bf;
+ }
+
+ bf->bf_state.bf_type = BUF_AMPDU | BUF_AGGR;
+ seqno = bf->bf_state.seqno;
+
+ /* do not step over block-ack window */
+ if (!BAW_WITHIN(tid->seq_start, tid->baw_size, seqno))
+ break;
+
+ if (tid->bar_index > ATH_BA_INDEX(tid->seq_start, seqno)) {
+ struct ath_tx_status ts = {};
+ struct list_head bf_head;
+
+ INIT_LIST_HEAD(&bf_head);
+ list_add(&bf->list, &bf_head);
+ __skb_unlink(skb, *q);
+ ath_tx_update_baw(sc, tid, seqno);
+ ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0);
+ continue;
+ }
+
+ return bf;
+ }
+
+ return NULL;
+}
+
+static bool
+ath_tx_form_aggr(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, struct list_head *bf_q,
+ struct ath_buf *bf_first, struct sk_buff_head *tid_q,
+ int *aggr_len)
+{
+#define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
+ struct ath_buf *bf = bf_first, *bf_prev = NULL;
+ int nframes = 0, ndelim;
+ u16 aggr_limit = 0, al = 0, bpad = 0,
+ al_delta, h_baw = tid->baw_size / 2;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_frame_info *fi;
+ struct sk_buff *skb;
+ bool closed = false;
+
+ bf = bf_first;
+ aggr_limit = ath_lookup_rate(sc, bf, tid);
+
+ do {
+ skb = bf->bf_mpdu;
+ fi = get_frame_info(skb);
+
+ /* do not exceed aggregation limit */
+ al_delta = ATH_AGGR_DELIM_SZ + fi->framelen;
+ if (nframes) {
+ if (aggr_limit < al + bpad + al_delta ||
+ ath_lookup_legacy(bf) || nframes >= h_baw)
+ break;
+
+ tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
+ if ((tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) ||
+ !(tx_info->flags & IEEE80211_TX_CTL_AMPDU))
+ break;
+ }
+
+ /* add padding for previous frame to aggregation length */
+ al += bpad + al_delta;
+
+ /*
+ * Get the delimiters needed to meet the MPDU
+ * density for this node.
+ */
+ ndelim = ath_compute_num_delims(sc, tid, bf_first, fi->framelen,
+ !nframes);
+ bpad = PADBYTES(al_delta) + (ndelim << 2);
+
+ nframes++;
+ bf->bf_next = NULL;
+
+ /* link buffers of this frame to the aggregate */
+ if (!fi->baw_tracked)
+ ath_tx_addto_baw(sc, tid, bf);
+ bf->bf_state.ndelim = ndelim;
+
+ __skb_unlink(skb, tid_q);
+ list_add_tail(&bf->list, bf_q);
+ if (bf_prev)
+ bf_prev->bf_next = bf;
+
+ bf_prev = bf;
+
+ bf = ath_tx_get_tid_subframe(sc, txq, tid, &tid_q);
+ if (!bf) {
+ closed = true;
+ break;
+ }
+ } while (ath_tid_has_buffered(tid));
+
+ bf = bf_first;
+ bf->bf_lastbf = bf_prev;
+
+ if (bf == bf_prev) {
+ al = get_frame_info(bf->bf_mpdu)->framelen;
+ bf->bf_state.bf_type = BUF_AMPDU;
+ } else {
+ TX_STAT_INC(txq->axq_qnum, a_aggr);
+ }
+
+ *aggr_len = al;
+
+ return closed;
+#undef PADBYTES
+}
+
+/*
+ * rix - rate index
+ * pktlen - total bytes (delims + data + fcs + pads + pad delims)
+ * width - 0 for 20 MHz, 1 for 40 MHz
+ * half_gi - to use 4us v/s 3.6 us for symbol time
+ */
+static u32 ath_pkt_duration(struct ath_softc *sc, u8 rix, int pktlen,
+ int width, int half_gi, bool shortPreamble)
+{
+ u32 nbits, nsymbits, duration, nsymbols;
+ int streams;
+
+ /* find number of symbols: PLCP + data */
+ streams = HT_RC_2_STREAMS(rix);
+ nbits = (pktlen << 3) + OFDM_PLCP_BITS;
+ nsymbits = bits_per_symbol[rix % 8][width] * streams;
+ nsymbols = (nbits + nsymbits - 1) / nsymbits;
+
+ if (!half_gi)
+ duration = SYMBOL_TIME(nsymbols);
+ else
+ duration = SYMBOL_TIME_HALFGI(nsymbols);
+
+ /* addup duration for legacy/ht training and signal fields */
+ duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
+
+ return duration;
+}
+
+static int ath_max_framelen(int usec, int mcs, bool ht40, bool sgi)
+{
+ int streams = HT_RC_2_STREAMS(mcs);
+ int symbols, bits;
+ int bytes = 0;
+
+ usec -= L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
+ symbols = sgi ? TIME_SYMBOLS_HALFGI(usec) : TIME_SYMBOLS(usec);
+ bits = symbols * bits_per_symbol[mcs % 8][ht40] * streams;
+ bits -= OFDM_PLCP_BITS;
+ bytes = bits / 8;
+ if (bytes > 65532)
+ bytes = 65532;
+
+ return bytes;
+}
+
+void ath_update_max_aggr_framelen(struct ath_softc *sc, int queue, int txop)
+{
+ u16 *cur_ht20, *cur_ht20_sgi, *cur_ht40, *cur_ht40_sgi;
+ int mcs;
+
+ /* 4ms is the default (and maximum) duration */
+ if (!txop || txop > 4096)
+ txop = 4096;
+
+ cur_ht20 = sc->tx.max_aggr_framelen[queue][MCS_HT20];
+ cur_ht20_sgi = sc->tx.max_aggr_framelen[queue][MCS_HT20_SGI];
+ cur_ht40 = sc->tx.max_aggr_framelen[queue][MCS_HT40];
+ cur_ht40_sgi = sc->tx.max_aggr_framelen[queue][MCS_HT40_SGI];
+ for (mcs = 0; mcs < 32; mcs++) {
+ cur_ht20[mcs] = ath_max_framelen(txop, mcs, false, false);
+ cur_ht20_sgi[mcs] = ath_max_framelen(txop, mcs, false, true);
+ cur_ht40[mcs] = ath_max_framelen(txop, mcs, true, false);
+ cur_ht40_sgi[mcs] = ath_max_framelen(txop, mcs, true, true);
+ }
+}
+
+static u8 ath_get_rate_txpower(struct ath_softc *sc, struct ath_buf *bf,
+ u8 rateidx, bool is_40, bool is_cck)
+{
+ u8 max_power;
+ struct sk_buff *skb;
+ struct ath_frame_info *fi;
+ struct ieee80211_tx_info *info;
+ struct ath_hw *ah = sc->sc_ah;
+
+ if (sc->tx99_state || !ah->tpc_enabled)
+ return MAX_RATE_POWER;
+
+ skb = bf->bf_mpdu;
+ fi = get_frame_info(skb);
+ info = IEEE80211_SKB_CB(skb);
+
+ if (!AR_SREV_9300_20_OR_LATER(ah)) {
+ int txpower = fi->tx_power;
+
+ if (is_40) {
+ u8 power_ht40delta;
+ struct ar5416_eeprom_def *eep = &ah->eeprom.def;
+
+ if (AR5416_VER_MASK >= AR5416_EEP_MINOR_VER_2) {
+ bool is_2ghz;
+ struct modal_eep_header *pmodal;
+
+ is_2ghz = info->band == IEEE80211_BAND_2GHZ;
+ pmodal = &eep->modalHeader[is_2ghz];
+ power_ht40delta = pmodal->ht40PowerIncForPdadc;
+ } else {
+ power_ht40delta = 2;
+ }
+ txpower += power_ht40delta;
+ }
+
+ if (AR_SREV_9287(ah) || AR_SREV_9285(ah) ||
+ AR_SREV_9271(ah)) {
+ txpower -= 2 * AR9287_PWR_TABLE_OFFSET_DB;
+ } else if (AR_SREV_9280_20_OR_LATER(ah)) {
+ s8 power_offset;
+
+ power_offset = ah->eep_ops->get_eeprom(ah,
+ EEP_PWR_TABLE_OFFSET);
+ txpower -= 2 * power_offset;
+ }
+
+ if (OLC_FOR_AR9280_20_LATER && is_cck)
+ txpower -= 2;
+
+ txpower = max(txpower, 0);
+ max_power = min_t(u8, ah->tx_power[rateidx], txpower);
+
+ /* XXX: clamp minimum TX power at 1 for AR9160 since if
+ * max_power is set to 0, frames are transmitted at max
+ * TX power
+ */
+ if (!max_power && !AR_SREV_9280_20_OR_LATER(ah))
+ max_power = 1;
+ } else if (!bf->bf_state.bfs_paprd) {
+ if (rateidx < 8 && (info->flags & IEEE80211_TX_CTL_STBC))
+ max_power = min_t(u8, ah->tx_power_stbc[rateidx],
+ fi->tx_power);
+ else
+ max_power = min_t(u8, ah->tx_power[rateidx],
+ fi->tx_power);
+ } else {
+ max_power = ah->paprd_training_power;
+ }
+
+ return max_power;
+}
+
+static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_tx_info *info, int len, bool rts)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ieee80211_tx_rate *rates;
+ const struct ieee80211_rate *rate;
+ struct ieee80211_hdr *hdr;
+ struct ath_frame_info *fi = get_frame_info(bf->bf_mpdu);
+ u32 rts_thresh = sc->hw->wiphy->rts_threshold;
+ int i;
+ u8 rix = 0;
+
+ skb = bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ rates = bf->rates;
+ hdr = (struct ieee80211_hdr *)skb->data;
+
+ /* set dur_update_en for l-sig computation except for PS-Poll frames */
+ info->dur_update = !ieee80211_is_pspoll(hdr->frame_control);
+ info->rtscts_rate = fi->rtscts_rate;
+
+ for (i = 0; i < ARRAY_SIZE(bf->rates); i++) {
+ bool is_40, is_sgi, is_sp, is_cck;
+ int phy;
+
+ if (!rates[i].count || (rates[i].idx < 0))
+ continue;
+
+ rix = rates[i].idx;
+ info->rates[i].Tries = rates[i].count;
+
+ /*
+ * Handle RTS threshold for unaggregated HT frames.
+ */
+ if (bf_isampdu(bf) && !bf_isaggr(bf) &&
+ (rates[i].flags & IEEE80211_TX_RC_MCS) &&
+ unlikely(rts_thresh != (u32) -1)) {
+ if (!rts_thresh || (len > rts_thresh))
+ rts = true;
+ }
+
+ if (rts || rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
+ info->rates[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+ info->flags |= ATH9K_TXDESC_RTSENA;
+ } else if (rates[i].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
+ info->rates[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+ info->flags |= ATH9K_TXDESC_CTSENA;
+ }
+
+ if (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ info->rates[i].RateFlags |= ATH9K_RATESERIES_2040;
+ if (rates[i].flags & IEEE80211_TX_RC_SHORT_GI)
+ info->rates[i].RateFlags |= ATH9K_RATESERIES_HALFGI;
+
+ is_sgi = !!(rates[i].flags & IEEE80211_TX_RC_SHORT_GI);
+ is_40 = !!(rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH);
+ is_sp = !!(rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
+
+ if (rates[i].flags & IEEE80211_TX_RC_MCS) {
+ /* MCS rates */
+ info->rates[i].Rate = rix | 0x80;
+ info->rates[i].ChSel = ath_txchainmask_reduction(sc,
+ ah->txchainmask, info->rates[i].Rate);
+ info->rates[i].PktDuration = ath_pkt_duration(sc, rix, len,
+ is_40, is_sgi, is_sp);
+ if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
+ info->rates[i].RateFlags |= ATH9K_RATESERIES_STBC;
+
+ info->txpower[i] = ath_get_rate_txpower(sc, bf, rix,
+ is_40, false);
+ continue;
+ }
+
+ /* legacy rates */
+ rate = &common->sbands[tx_info->band].bitrates[rates[i].idx];
+ if ((tx_info->band == IEEE80211_BAND_2GHZ) &&
+ !(rate->flags & IEEE80211_RATE_ERP_G))
+ phy = WLAN_RC_PHY_CCK;
+ else
+ phy = WLAN_RC_PHY_OFDM;
+
+ info->rates[i].Rate = rate->hw_value;
+ if (rate->hw_value_short) {
+ if (rates[i].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+ info->rates[i].Rate |= rate->hw_value_short;
+ } else {
+ is_sp = false;
+ }
+
+ if (bf->bf_state.bfs_paprd)
+ info->rates[i].ChSel = ah->txchainmask;
+ else
+ info->rates[i].ChSel = ath_txchainmask_reduction(sc,
+ ah->txchainmask, info->rates[i].Rate);
+
+ info->rates[i].PktDuration = ath9k_hw_computetxtime(sc->sc_ah,
+ phy, rate->bitrate * 100, len, rix, is_sp);
+
+ is_cck = IS_CCK_RATE(info->rates[i].Rate);
+ info->txpower[i] = ath_get_rate_txpower(sc, bf, rix, false,
+ is_cck);
+ }
+
+ /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
+ if (bf_isaggr(bf) && (len > sc->sc_ah->caps.rts_aggr_limit))
+ info->flags &= ~ATH9K_TXDESC_RTSENA;
+
+ /* ATH9K_TXDESC_RTSENA and ATH9K_TXDESC_CTSENA are mutually exclusive. */
+ if (info->flags & ATH9K_TXDESC_RTSENA)
+ info->flags &= ~ATH9K_TXDESC_CTSENA;
+}
+
+static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr;
+ enum ath9k_pkt_type htype;
+ __le16 fc;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+
+ if (ieee80211_is_beacon(fc))
+ htype = ATH9K_PKT_TYPE_BEACON;
+ else if (ieee80211_is_probe_resp(fc))
+ htype = ATH9K_PKT_TYPE_PROBE_RESP;
+ else if (ieee80211_is_atim(fc))
+ htype = ATH9K_PKT_TYPE_ATIM;
+ else if (ieee80211_is_pspoll(fc))
+ htype = ATH9K_PKT_TYPE_PSPOLL;
+ else
+ htype = ATH9K_PKT_TYPE_NORMAL;
+
+ return htype;
+}
+
+static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_txq *txq, int len)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_buf *bf_first = NULL;
+ struct ath_tx_info info;
+ u32 rts_thresh = sc->hw->wiphy->rts_threshold;
+ bool rts = false;
+
+ memset(&info, 0, sizeof(info));
+ info.is_first = true;
+ info.is_last = true;
+ info.qcu = txq->axq_qnum;
+
+ while (bf) {
+ struct sk_buff *skb = bf->bf_mpdu;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_frame_info *fi = get_frame_info(skb);
+ bool aggr = !!(bf->bf_state.bf_type & BUF_AGGR);
+
+ info.type = get_hw_packet_type(skb);
+ if (bf->bf_next)
+ info.link = bf->bf_next->bf_daddr;
+ else
+ info.link = (sc->tx99_state) ? bf->bf_daddr : 0;
+
+ if (!bf_first) {
+ bf_first = bf;
+
+ if (!sc->tx99_state)
+ info.flags = ATH9K_TXDESC_INTREQ;
+ if ((tx_info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT) ||
+ txq == sc->tx.uapsdq)
+ info.flags |= ATH9K_TXDESC_CLRDMASK;
+
+ if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
+ info.flags |= ATH9K_TXDESC_NOACK;
+ if (tx_info->flags & IEEE80211_TX_CTL_LDPC)
+ info.flags |= ATH9K_TXDESC_LDPC;
+
+ if (bf->bf_state.bfs_paprd)
+ info.flags |= (u32) bf->bf_state.bfs_paprd <<
+ ATH9K_TXDESC_PAPRD_S;
+
+ /*
+ * mac80211 doesn't handle RTS threshold for HT because
+ * the decision has to be taken based on AMPDU length
+ * and aggregation is done entirely inside ath9k.
+ * Set the RTS/CTS flag for the first subframe based
+ * on the threshold.
+ */
+ if (aggr && (bf == bf_first) &&
+ unlikely(rts_thresh != (u32) -1)) {
+ /*
+ * "len" is the size of the entire AMPDU.
+ */
+ if (!rts_thresh || (len > rts_thresh))
+ rts = true;
+ }
+
+ if (!aggr)
+ len = fi->framelen;
+
+ ath_buf_set_rate(sc, bf, &info, len, rts);
+ }
+
+ info.buf_addr[0] = bf->bf_buf_addr;
+ info.buf_len[0] = skb->len;
+ info.pkt_len = fi->framelen;
+ info.keyix = fi->keyix;
+ info.keytype = fi->keytype;
+
+ if (aggr) {
+ if (bf == bf_first)
+ info.aggr = AGGR_BUF_FIRST;
+ else if (bf == bf_first->bf_lastbf)
+ info.aggr = AGGR_BUF_LAST;
+ else
+ info.aggr = AGGR_BUF_MIDDLE;
+
+ info.ndelim = bf->bf_state.ndelim;
+ info.aggr_len = len;
+ }
+
+ if (bf == bf_first->bf_lastbf)
+ bf_first = NULL;
+
+ ath9k_hw_set_txdesc(ah, bf->bf_desc, &info);
+ bf = bf->bf_next;
+ }
+}
+
+static void
+ath_tx_form_burst(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, struct list_head *bf_q,
+ struct ath_buf *bf_first, struct sk_buff_head *tid_q)
+{
+ struct ath_buf *bf = bf_first, *bf_prev = NULL;
+ struct sk_buff *skb;
+ int nframes = 0;
+
+ do {
+ struct ieee80211_tx_info *tx_info;
+ skb = bf->bf_mpdu;
+
+ nframes++;
+ __skb_unlink(skb, tid_q);
+ list_add_tail(&bf->list, bf_q);
+ if (bf_prev)
+ bf_prev->bf_next = bf;
+ bf_prev = bf;
+
+ if (nframes >= 2)
+ break;
+
+ bf = ath_tx_get_tid_subframe(sc, txq, tid, &tid_q);
+ if (!bf)
+ break;
+
+ tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
+ if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
+ break;
+
+ ath_set_rates(tid->an->vif, tid->an->sta, bf);
+ } while (1);
+}
+
+static bool ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, bool *stop)
+{
+ struct ath_buf *bf;
+ struct ieee80211_tx_info *tx_info;
+ struct sk_buff_head *tid_q;
+ struct list_head bf_q;
+ int aggr_len = 0;
+ bool aggr, last = true;
+
+ if (!ath_tid_has_buffered(tid))
+ return false;
+
+ INIT_LIST_HEAD(&bf_q);
+
+ bf = ath_tx_get_tid_subframe(sc, txq, tid, &tid_q);
+ if (!bf)
+ return false;
+
+ tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
+ aggr = !!(tx_info->flags & IEEE80211_TX_CTL_AMPDU);
+ if ((aggr && txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) ||
+ (!aggr && txq->axq_depth >= ATH_NON_AGGR_MIN_QDEPTH)) {
+ *stop = true;
+ return false;
+ }
+
+ ath_set_rates(tid->an->vif, tid->an->sta, bf);
+ if (aggr)
+ last = ath_tx_form_aggr(sc, txq, tid, &bf_q, bf,
+ tid_q, &aggr_len);
+ else
+ ath_tx_form_burst(sc, txq, tid, &bf_q, bf, tid_q);
+
+ if (list_empty(&bf_q))
+ return false;
+
+ if (tid->ac->clear_ps_filter || tid->an->no_ps_filter) {
+ tid->ac->clear_ps_filter = false;
+ tx_info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
+ }
+
+ ath_tx_fill_desc(sc, bf, txq, aggr_len);
+ ath_tx_txqaddbuf(sc, txq, &bf_q, false);
+ return true;
+}
+
+int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
+ u16 tid, u16 *ssn)
+{
+ struct ath_atx_tid *txtid;
+ struct ath_txq *txq;
+ struct ath_node *an;
+ u8 density;
+
+ an = (struct ath_node *)sta->drv_priv;
+ txtid = ATH_AN_2_TID(an, tid);
+ txq = txtid->ac->txq;
+
+ ath_txq_lock(sc, txq);
+
+ /* update ampdu factor/density, they may have changed. This may happen
+ * in HT IBSS when a beacon with HT-info is received after the station
+ * has already been added.
+ */
+ if (sta->ht_cap.ht_supported) {
+ an->maxampdu = (1 << (IEEE80211_HT_MAX_AMPDU_FACTOR +
+ sta->ht_cap.ampdu_factor)) - 1;
+ density = ath9k_parse_mpdudensity(sta->ht_cap.ampdu_density);
+ an->mpdudensity = density;
+ }
+
+ /* force sequence number allocation for pending frames */
+ ath_tx_tid_change_state(sc, txtid);
+
+ txtid->active = true;
+ *ssn = txtid->seq_start = txtid->seq_next;
+ txtid->bar_index = -1;
+
+ memset(txtid->tx_buf, 0, sizeof(txtid->tx_buf));
+ txtid->baw_head = txtid->baw_tail = 0;
+
+ ath_txq_unlock_complete(sc, txq);
+
+ return 0;
+}
+
+void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
+{
+ struct ath_node *an = (struct ath_node *)sta->drv_priv;
+ struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
+ struct ath_txq *txq = txtid->ac->txq;
+
+ ath_txq_lock(sc, txq);
+ txtid->active = false;
+ ath_tx_flush_tid(sc, txtid);
+ ath_tx_tid_change_state(sc, txtid);
+ ath_txq_unlock_complete(sc, txq);
+}
+
+void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
+ struct ath_node *an)
+{
+ struct ath_atx_tid *tid;
+ struct ath_atx_ac *ac;
+ struct ath_txq *txq;
+ bool buffered;
+ int tidno;
+
+ for (tidno = 0, tid = &an->tid[tidno];
+ tidno < IEEE80211_NUM_TIDS; tidno++, tid++) {
+
+ ac = tid->ac;
+ txq = ac->txq;
+
+ ath_txq_lock(sc, txq);
+
+ if (!tid->sched) {
+ ath_txq_unlock(sc, txq);
+ continue;
+ }
+
+ buffered = ath_tid_has_buffered(tid);
+
+ tid->sched = false;
+ list_del(&tid->list);
+
+ if (ac->sched) {
+ ac->sched = false;
+ list_del(&ac->list);
+ }
+
+ ath_txq_unlock(sc, txq);
+
+ ieee80211_sta_set_buffered(sta, tidno, buffered);
+ }
+}
+
+void ath_tx_aggr_wakeup(struct ath_softc *sc, struct ath_node *an)
+{
+ struct ath_atx_tid *tid;
+ struct ath_atx_ac *ac;
+ struct ath_txq *txq;
+ int tidno;
+
+ for (tidno = 0, tid = &an->tid[tidno];
+ tidno < IEEE80211_NUM_TIDS; tidno++, tid++) {
+
+ ac = tid->ac;
+ txq = ac->txq;
+
+ ath_txq_lock(sc, txq);
+ ac->clear_ps_filter = true;
+
+ if (ath_tid_has_buffered(tid)) {
+ ath_tx_queue_tid(sc, txq, tid);
+ ath_txq_schedule(sc, txq);
+ }
+
+ ath_txq_unlock_complete(sc, txq);
+ }
+}
+
+void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta,
+ u16 tidno)
+{
+ struct ath_atx_tid *tid;
+ struct ath_node *an;
+ struct ath_txq *txq;
+
+ an = (struct ath_node *)sta->drv_priv;
+ tid = ATH_AN_2_TID(an, tidno);
+ txq = tid->ac->txq;
+
+ ath_txq_lock(sc, txq);
+
+ tid->baw_size = IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
+
+ if (ath_tid_has_buffered(tid)) {
+ ath_tx_queue_tid(sc, txq, tid);
+ ath_txq_schedule(sc, txq);
+ }
+
+ ath_txq_unlock_complete(sc, txq);
+}
+
+void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
+ struct ieee80211_sta *sta,
+ u16 tids, int nframes,
+ enum ieee80211_frame_release_type reason,
+ bool more_data)
+{
+ struct ath_softc *sc = hw->priv;
+ struct ath_node *an = (struct ath_node *)sta->drv_priv;
+ struct ath_txq *txq = sc->tx.uapsdq;
+ struct ieee80211_tx_info *info;
+ struct list_head bf_q;
+ struct ath_buf *bf_tail = NULL, *bf;
+ struct sk_buff_head *tid_q;
+ int sent = 0;
+ int i;
+
+ INIT_LIST_HEAD(&bf_q);
+ for (i = 0; tids && nframes; i++, tids >>= 1) {
+ struct ath_atx_tid *tid;
+
+ if (!(tids & 1))
+ continue;
+
+ tid = ATH_AN_2_TID(an, i);
+
+ ath_txq_lock(sc, tid->ac->txq);
+ while (nframes > 0) {
+ bf = ath_tx_get_tid_subframe(sc, sc->tx.uapsdq, tid, &tid_q);
+ if (!bf)
+ break;
+
+ __skb_unlink(bf->bf_mpdu, tid_q);
+ list_add_tail(&bf->list, &bf_q);
+ ath_set_rates(tid->an->vif, tid->an->sta, bf);
+ if (bf_isampdu(bf)) {
+ ath_tx_addto_baw(sc, tid, bf);
+ bf->bf_state.bf_type &= ~BUF_AGGR;
+ }
+ if (bf_tail)
+ bf_tail->bf_next = bf;
+
+ bf_tail = bf;
+ nframes--;
+ sent++;
+ TX_STAT_INC(txq->axq_qnum, a_queued_hw);
+
+ if (an->sta && !ath_tid_has_buffered(tid))
+ ieee80211_sta_set_buffered(an->sta, i, false);
+ }
+ ath_txq_unlock_complete(sc, tid->ac->txq);
+ }
+
+ if (list_empty(&bf_q))
+ return;
+
+ info = IEEE80211_SKB_CB(bf_tail->bf_mpdu);
+ info->flags |= IEEE80211_TX_STATUS_EOSP;
+
+ bf = list_first_entry(&bf_q, struct ath_buf, list);
+ ath_txq_lock(sc, txq);
+ ath_tx_fill_desc(sc, bf, txq, 0);
+ ath_tx_txqaddbuf(sc, txq, &bf_q, false);
+ ath_txq_unlock(sc, txq);
+}
+
+/********************/
+/* Queue Management */
+/********************/
+
+struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath9k_tx_queue_info qi;
+ static const int subtype_txq_to_hwq[] = {
+ [IEEE80211_AC_BE] = ATH_TXQ_AC_BE,
+ [IEEE80211_AC_BK] = ATH_TXQ_AC_BK,
+ [IEEE80211_AC_VI] = ATH_TXQ_AC_VI,
+ [IEEE80211_AC_VO] = ATH_TXQ_AC_VO,
+ };
+ int axq_qnum, i;
+
+ memset(&qi, 0, sizeof(qi));
+ qi.tqi_subtype = subtype_txq_to_hwq[subtype];
+ qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_physCompBuf = 0;
+
+ /*
+ * Enable interrupts only for EOL and DESC conditions.
+ * We mark tx descriptors to receive a DESC interrupt
+ * when a tx queue gets deep; otherwise waiting for the
+ * EOL to reap descriptors. Note that this is done to
+ * reduce interrupt load and this only defers reaping
+ * descriptors, never transmitting frames. Aside from
+ * reducing interrupts this also permits more concurrency.
+ * The only potential downside is if the tx queue backs
+ * up in which case the top half of the kernel may backup
+ * due to a lack of tx descriptors.
+ *
+ * The UAPSD queue is an exception, since we take a desc-
+ * based intr on the EOSP frames.
+ */
+ if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
+ qi.tqi_qflags = TXQ_FLAG_TXINT_ENABLE;
+ } else {
+ if (qtype == ATH9K_TX_QUEUE_UAPSD)
+ qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE;
+ else
+ qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |
+ TXQ_FLAG_TXDESCINT_ENABLE;
+ }
+ axq_qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi);
+ if (axq_qnum == -1) {
+ /*
+ * NB: don't print a message, this happens
+ * normally on parts with too few tx queues
+ */
+ return NULL;
+ }
+ if (!ATH_TXQ_SETUP(sc, axq_qnum)) {
+ struct ath_txq *txq = &sc->tx.txq[axq_qnum];
+
+ txq->axq_qnum = axq_qnum;
+ txq->mac80211_qnum = -1;
+ txq->axq_link = NULL;
+ __skb_queue_head_init(&txq->complete_q);
+ INIT_LIST_HEAD(&txq->axq_q);
+ spin_lock_init(&txq->axq_lock);
+ txq->axq_depth = 0;
+ txq->axq_ampdu_depth = 0;
+ txq->axq_tx_inprogress = false;
+ sc->tx.txqsetup |= 1<<axq_qnum;
+
+ txq->txq_headidx = txq->txq_tailidx = 0;
+ for (i = 0; i < ATH_TXFIFO_DEPTH; i++)
+ INIT_LIST_HEAD(&txq->txq_fifo[i]);
+ }
+ return &sc->tx.txq[axq_qnum];
+}
+
+int ath_txq_update(struct ath_softc *sc, int qnum,
+ struct ath9k_tx_queue_info *qinfo)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ int error = 0;
+ struct ath9k_tx_queue_info qi;
+
+ BUG_ON(sc->tx.txq[qnum].axq_qnum != qnum);
+
+ ath9k_hw_get_txq_props(ah, qnum, &qi);
+ qi.tqi_aifs = qinfo->tqi_aifs;
+ qi.tqi_cwmin = qinfo->tqi_cwmin;
+ qi.tqi_cwmax = qinfo->tqi_cwmax;
+ qi.tqi_burstTime = qinfo->tqi_burstTime;
+ qi.tqi_readyTime = qinfo->tqi_readyTime;
+
+ if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
+ ath_err(ath9k_hw_common(sc->sc_ah),
+ "Unable to update hardware queue %u!\n", qnum);
+ error = -EIO;
+ } else {
+ ath9k_hw_resettxqueue(ah, qnum);
+ }
+
+ return error;
+}
+
+int ath_cabq_update(struct ath_softc *sc)
+{
+ struct ath9k_tx_queue_info qi;
+ struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
+ int qnum = sc->beacon.cabq->axq_qnum;
+
+ ath9k_hw_get_txq_props(sc->sc_ah, qnum, &qi);
+
+ qi.tqi_readyTime = (TU_TO_USEC(cur_conf->beacon_interval) *
+ ATH_CABQ_READY_TIME) / 100;
+ ath_txq_update(sc, qnum, &qi);
+
+ return 0;
+}
+
+static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
+ struct list_head *list)
+{
+ struct ath_buf *bf, *lastbf;
+ struct list_head bf_head;
+ struct ath_tx_status ts;
+
+ memset(&ts, 0, sizeof(ts));
+ ts.ts_status = ATH9K_TX_FLUSH;
+ INIT_LIST_HEAD(&bf_head);
+
+ while (!list_empty(list)) {
+ bf = list_first_entry(list, struct ath_buf, list);
+
+ if (bf->bf_state.stale) {
+ list_del(&bf->list);
+
+ ath_tx_return_buffer(sc, bf);
+ continue;
+ }
+
+ lastbf = bf->bf_lastbf;
+ list_cut_position(&bf_head, list, &lastbf->list);
+ ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+ }
+}
+
+/*
+ * Drain a given TX queue (could be Beacon or Data)
+ *
+ * This assumes output has been stopped and
+ * we do not need to block ath_tx_tasklet.
+ */
+void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq)
+{
+ ath_txq_lock(sc, txq);
+
+ if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
+ int idx = txq->txq_tailidx;
+
+ while (!list_empty(&txq->txq_fifo[idx])) {
+ ath_drain_txq_list(sc, txq, &txq->txq_fifo[idx]);
+
+ INCR(idx, ATH_TXFIFO_DEPTH);
+ }
+ txq->txq_tailidx = idx;
+ }
+
+ txq->axq_link = NULL;
+ txq->axq_tx_inprogress = false;
+ ath_drain_txq_list(sc, txq, &txq->axq_q);
+
+ ath_txq_unlock_complete(sc, txq);
+}
+
+bool ath_drain_all_txq(struct ath_softc *sc)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_txq *txq;
+ int i;
+ u32 npend = 0;
+
+ if (test_bit(ATH_OP_INVALID, &common->op_flags))
+ return true;
+
+ ath9k_hw_abort_tx_dma(ah);
+
+ /* Check if any queue remains active */
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (!ATH_TXQ_SETUP(sc, i))
+ continue;
+
+ if (!sc->tx.txq[i].axq_depth)
+ continue;
+
+ if (ath9k_hw_numtxpending(ah, sc->tx.txq[i].axq_qnum))
+ npend |= BIT(i);
+ }
+
+ if (npend)
+ ath_err(common, "Failed to stop TX DMA, queues=0x%03x!\n", npend);
+
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (!ATH_TXQ_SETUP(sc, i))
+ continue;
+
+ /*
+ * The caller will resume queues with ieee80211_wake_queues.
+ * Mark the queue as not stopped to prevent ath_tx_complete
+ * from waking the queue too early.
+ */
+ txq = &sc->tx.txq[i];
+ txq->stopped = false;
+ ath_draintxq(sc, txq);
+ }
+
+ return !npend;
+}
+
+void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
+{
+ ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum);
+ sc->tx.txqsetup &= ~(1<<txq->axq_qnum);
+}
+
+/* For each acq entry, for each tid, try to schedule packets
+ * for transmit until ampdu_depth has reached min Q depth.
+ */
+void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_atx_ac *ac, *last_ac;
+ struct ath_atx_tid *tid, *last_tid;
+ struct list_head *ac_list;
+ bool sent = false;
+
+ if (txq->mac80211_qnum < 0)
+ return;
+
+ if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
+ return;
+
+ spin_lock_bh(&sc->chan_lock);
+ ac_list = &sc->cur_chan->acq[txq->mac80211_qnum];
+
+ if (list_empty(ac_list)) {
+ spin_unlock_bh(&sc->chan_lock);
+ return;
+ }
+
+ rcu_read_lock();
+
+ last_ac = list_entry(ac_list->prev, struct ath_atx_ac, list);
+ while (!list_empty(ac_list)) {
+ bool stop = false;
+
+ if (sc->cur_chan->stopped)
+ break;
+
+ ac = list_first_entry(ac_list, struct ath_atx_ac, list);
+ last_tid = list_entry(ac->tid_q.prev, struct ath_atx_tid, list);
+ list_del(&ac->list);
+ ac->sched = false;
+
+ while (!list_empty(&ac->tid_q)) {
+
+ tid = list_first_entry(&ac->tid_q, struct ath_atx_tid,
+ list);
+ list_del(&tid->list);
+ tid->sched = false;
+
+ if (ath_tx_sched_aggr(sc, txq, tid, &stop))
+ sent = true;
+
+ /*
+ * add tid to round-robin queue if more frames
+ * are pending for the tid
+ */
+ if (ath_tid_has_buffered(tid))
+ ath_tx_queue_tid(sc, txq, tid);
+
+ if (stop || tid == last_tid)
+ break;
+ }
+
+ if (!list_empty(&ac->tid_q) && !ac->sched) {
+ ac->sched = true;
+ list_add_tail(&ac->list, ac_list);
+ }
+
+ if (stop)
+ break;
+
+ if (ac == last_ac) {
+ if (!sent)
+ break;
+
+ sent = false;
+ last_ac = list_entry(ac_list->prev,
+ struct ath_atx_ac, list);
+ }
+ }
+
+ rcu_read_unlock();
+ spin_unlock_bh(&sc->chan_lock);
+}
+
+void ath_txq_schedule_all(struct ath_softc *sc)
+{
+ struct ath_txq *txq;
+ int i;
+
+ for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+ txq = sc->tx.txq_map[i];
+
+ spin_lock_bh(&txq->axq_lock);
+ ath_txq_schedule(sc, txq);
+ spin_unlock_bh(&txq->axq_lock);
+ }
+}
+
+/***********/
+/* TX, DMA */
+/***********/
+
+/*
+ * Insert a chain of ath_buf (descriptors) on a txq and
+ * assume the descriptors are already chained together by caller.
+ */
+static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
+ struct list_head *head, bool internal)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
+ struct ath_buf *bf, *bf_last;
+ bool puttxbuf = false;
+ bool edma;
+
+ /*
+ * Insert the frame on the outbound list and
+ * pass it on to the hardware.
+ */
+
+ if (list_empty(head))
+ return;
+
+ edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
+ bf = list_first_entry(head, struct ath_buf, list);
+ bf_last = list_entry(head->prev, struct ath_buf, list);
+
+ ath_dbg(common, QUEUE, "qnum: %d, txq depth: %d\n",
+ txq->axq_qnum, txq->axq_depth);
+
+ if (edma && list_empty(&txq->txq_fifo[txq->txq_headidx])) {
+ list_splice_tail_init(head, &txq->txq_fifo[txq->txq_headidx]);
+ INCR(txq->txq_headidx, ATH_TXFIFO_DEPTH);
+ puttxbuf = true;
+ } else {
+ list_splice_tail_init(head, &txq->axq_q);
+
+ if (txq->axq_link) {
+ ath9k_hw_set_desc_link(ah, txq->axq_link, bf->bf_daddr);
+ ath_dbg(common, XMIT, "link[%u] (%p)=%llx (%p)\n",
+ txq->axq_qnum, txq->axq_link,
+ ito64(bf->bf_daddr), bf->bf_desc);
+ } else if (!edma)
+ puttxbuf = true;
+
+ txq->axq_link = bf_last->bf_desc;
+ }
+
+ if (puttxbuf) {
+ TX_STAT_INC(txq->axq_qnum, puttxbuf);
+ ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
+ ath_dbg(common, XMIT, "TXDP[%u] = %llx (%p)\n",
+ txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
+ }
+
+ if (!edma || sc->tx99_state) {
+ TX_STAT_INC(txq->axq_qnum, txstart);
+ ath9k_hw_txstart(ah, txq->axq_qnum);
+ }
+
+ if (!internal) {
+ while (bf) {
+ txq->axq_depth++;
+ if (bf_is_ampdu_not_probing(bf))
+ txq->axq_ampdu_depth++;
+
+ bf_last = bf->bf_lastbf;
+ bf = bf_last->bf_next;
+ bf_last->bf_next = NULL;
+ }
+ }
+}
+
+static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid, struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct list_head bf_head;
+ struct ath_buf *bf = fi->bf;
+
+ INIT_LIST_HEAD(&bf_head);
+ list_add_tail(&bf->list, &bf_head);
+ bf->bf_state.bf_type = 0;
+ if (tid && (tx_info->flags & IEEE80211_TX_CTL_AMPDU)) {
+ bf->bf_state.bf_type = BUF_AMPDU;
+ ath_tx_addto_baw(sc, tid, bf);
+ }
+
+ bf->bf_next = NULL;
+ bf->bf_lastbf = bf;
+ ath_tx_fill_desc(sc, bf, txq, fi->framelen);
+ ath_tx_txqaddbuf(sc, txq, &bf_head, false);
+ TX_STAT_INC(txq->axq_qnum, queued);
+}
+
+static void setup_frame_info(struct ieee80211_hw *hw,
+ struct ieee80211_sta *sta,
+ struct sk_buff *skb,
+ int framelen)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ const struct ieee80211_rate *rate;
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct ath_node *an = NULL;
+ enum ath9k_key_type keytype;
+ bool short_preamble = false;
+ u8 txpower;
+
+ /*
+ * We check if Short Preamble is needed for the CTS rate by
+ * checking the BSS's global flag.
+ * But for the rate series, IEEE80211_TX_RC_USE_SHORT_PREAMBLE is used.
+ */
+ if (tx_info->control.vif &&
+ tx_info->control.vif->bss_conf.use_short_preamble)
+ short_preamble = true;
+
+ rate = ieee80211_get_rts_cts_rate(hw, tx_info);
+ keytype = ath9k_cmn_get_hw_crypto_keytype(skb);
+
+ if (sta)
+ an = (struct ath_node *) sta->drv_priv;
+
+ if (tx_info->control.vif) {
+ struct ieee80211_vif *vif = tx_info->control.vif;
+
+ txpower = 2 * vif->bss_conf.txpower;
+ } else {
+ struct ath_softc *sc = hw->priv;
+
+ txpower = sc->cur_chan->cur_txpower;
+ }
+
+ memset(fi, 0, sizeof(*fi));
+ fi->txq = -1;
+ if (hw_key)
+ fi->keyix = hw_key->hw_key_idx;
+ else if (an && ieee80211_is_data(hdr->frame_control) && an->ps_key > 0)
+ fi->keyix = an->ps_key;
+ else
+ fi->keyix = ATH9K_TXKEYIX_INVALID;
+ fi->keytype = keytype;
+ fi->framelen = framelen;
+ fi->tx_power = txpower;
+
+ if (!rate)
+ return;
+ fi->rtscts_rate = rate->hw_value;
+ if (short_preamble)
+ fi->rtscts_rate |= rate->hw_value_short;
+}
+
+u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath9k_channel *curchan = ah->curchan;
+
+ if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) && IS_CHAN_5GHZ(curchan) &&
+ (chainmask == 0x7) && (rate < 0x90))
+ return 0x3;
+ else if (AR_SREV_9462(ah) && ath9k_hw_btcoex_is_enabled(ah) &&
+ IS_CCK_RATE(rate))
+ return 0x2;
+ else
+ return chainmask;
+}
+
+/*
+ * Assign a descriptor (and sequence number if necessary,
+ * and map buffer for DMA. Frees skb on error
+ */
+static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct sk_buff *skb)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ath_buf *bf;
+ int fragno;
+ u16 seqno;
+
+ bf = ath_tx_get_buffer(sc);
+ if (!bf) {
+ ath_dbg(common, XMIT, "TX buffers are full\n");
+ return NULL;
+ }
+
+ ATH_TXBUF_RESET(bf);
+
+ if (tid && ieee80211_is_data_present(hdr->frame_control)) {
+ fragno = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
+ seqno = tid->seq_next;
+ hdr->seq_ctrl = cpu_to_le16(tid->seq_next << IEEE80211_SEQ_SEQ_SHIFT);
+
+ if (fragno)
+ hdr->seq_ctrl |= cpu_to_le16(fragno);
+
+ if (!ieee80211_has_morefrags(hdr->frame_control))
+ INCR(tid->seq_next, IEEE80211_SEQ_MAX);
+
+ bf->bf_state.seqno = seqno;
+ }
+
+ bf->bf_mpdu = skb;
+
+ bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
+ skb->len, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
+ bf->bf_mpdu = NULL;
+ bf->bf_buf_addr = 0;
+ ath_err(ath9k_hw_common(sc->sc_ah),
+ "dma_mapping_error() on TX\n");
+ ath_tx_return_buffer(sc, bf);
+ return NULL;
+ }
+
+ fi->bf = bf;
+
+ return bf;
+}
+
+void ath_assign_seq(struct ath_common *common, struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_vif *vif = info->control.vif;
+ struct ath_vif *avp;
+
+ if (!(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
+ return;
+
+ if (!vif)
+ return;
+
+ avp = (struct ath_vif *)vif->drv_priv;
+
+ if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
+ avp->seq_no += 0x10;
+
+ hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
+ hdr->seq_ctrl |= cpu_to_le16(avp->seq_no);
+}
+
+static int ath_tx_prepare(struct ieee80211_hw *hw, struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sta *sta = txctl->sta;
+ struct ieee80211_vif *vif = info->control.vif;
+ struct ath_vif *avp;
+ struct ath_softc *sc = hw->priv;
+ int frmlen = skb->len + FCS_LEN;
+ int padpos, padsize;
+
+ /* NOTE: sta can be NULL according to net/mac80211.h */
+ if (sta)
+ txctl->an = (struct ath_node *)sta->drv_priv;
+ else if (vif && ieee80211_is_data(hdr->frame_control)) {
+ avp = (void *)vif->drv_priv;
+ txctl->an = &avp->mcast_node;
+ }
+
+ if (info->control.hw_key)
+ frmlen += info->control.hw_key->icv_len;
+
+ ath_assign_seq(ath9k_hw_common(sc->sc_ah), skb);
+
+ if ((vif && vif->type != NL80211_IFTYPE_AP &&
+ vif->type != NL80211_IFTYPE_AP_VLAN) ||
+ !ieee80211_is_data(hdr->frame_control))
+ info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
+
+ /* Add the padding after the header if this is not already done */
+ padpos = ieee80211_hdrlen(hdr->frame_control);
+ padsize = padpos & 3;
+ if (padsize && skb->len > padpos) {
+ if (skb_headroom(skb) < padsize)
+ return -ENOMEM;
+
+ skb_push(skb, padsize);
+ memmove(skb->data, skb->data + padsize, padpos);
+ }
+
+ setup_frame_info(hw, sta, skb, frmlen);
+ return 0;
+}
+
+
+/* Upon failure caller should free skb */
+int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_sta *sta = txctl->sta;
+ struct ieee80211_vif *vif = info->control.vif;
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct ath_vif *avp = NULL;
+ struct ath_softc *sc = hw->priv;
+ struct ath_txq *txq = txctl->txq;
+ struct ath_atx_tid *tid = NULL;
+ struct ath_buf *bf;
+ bool queue, skip_uapsd = false, ps_resp;
+ int q, ret;
+
+ if (vif)
+ avp = (void *)vif->drv_priv;
+
+ if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
+ txctl->force_channel = true;
+
+ ps_resp = !!(info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE);
+
+ ret = ath_tx_prepare(hw, skb, txctl);
+ if (ret)
+ return ret;
+
+ hdr = (struct ieee80211_hdr *) skb->data;
+ /*
+ * At this point, the vif, hw_key and sta pointers in the tx control
+ * info are no longer valid (overwritten by the ath_frame_info data.
+ */
+
+ q = skb_get_queue_mapping(skb);
+
+ ath_txq_lock(sc, txq);
+ if (txq == sc->tx.txq_map[q]) {
+ fi->txq = q;
+ if (++txq->pending_frames > sc->tx.txq_max_pending[q] &&
+ !txq->stopped) {
+ if (ath9k_is_chanctx_enabled())
+ ieee80211_stop_queue(sc->hw, info->hw_queue);
+ else
+ ieee80211_stop_queue(sc->hw, q);
+ txq->stopped = true;
+ }
+ }
+
+ queue = ieee80211_is_data_present(hdr->frame_control);
+
+ /* Force queueing of all frames that belong to a virtual interface on
+ * a different channel context, to ensure that they are sent on the
+ * correct channel.
+ */
+ if (((avp && avp->chanctx != sc->cur_chan) ||
+ sc->cur_chan->stopped) && !txctl->force_channel) {
+ if (!txctl->an)
+ txctl->an = &avp->mcast_node;
+ queue = true;
+ skip_uapsd = true;
+ }
+
+ if (txctl->an && queue)
+ tid = ath_get_skb_tid(sc, txctl->an, skb);
+
+ if (!skip_uapsd && ps_resp) {
+ ath_txq_unlock(sc, txq);
+ txq = sc->tx.uapsdq;
+ ath_txq_lock(sc, txq);
+ } else if (txctl->an && queue) {
+ WARN_ON(tid->ac->txq != txctl->txq);
+
+ if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
+ tid->ac->clear_ps_filter = true;
+
+ /*
+ * Add this frame to software queue for scheduling later
+ * for aggregation.
+ */
+ TX_STAT_INC(txq->axq_qnum, a_queued_sw);
+ __skb_queue_tail(&tid->buf_q, skb);
+ if (!txctl->an->sleeping)
+ ath_tx_queue_tid(sc, txq, tid);
+
+ ath_txq_schedule(sc, txq);
+ goto out;
+ }
+
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ if (!bf) {
+ ath_txq_skb_done(sc, txq, skb);
+ if (txctl->paprd)
+ dev_kfree_skb_any(skb);
+ else
+ ieee80211_free_txskb(sc->hw, skb);
+ goto out;
+ }
+
+ bf->bf_state.bfs_paprd = txctl->paprd;
+
+ if (txctl->paprd)
+ bf->bf_state.bfs_paprd_timestamp = jiffies;
+
+ ath_set_rates(vif, sta, bf);
+ ath_tx_send_normal(sc, txq, tid, skb);
+
+out:
+ ath_txq_unlock(sc, txq);
+
+ return 0;
+}
+
+void ath_tx_cabq(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+ struct sk_buff *skb)
+{
+ struct ath_softc *sc = hw->priv;
+ struct ath_tx_control txctl = {
+ .txq = sc->beacon.cabq
+ };
+ struct ath_tx_info info = {};
+ struct ieee80211_hdr *hdr;
+ struct ath_buf *bf_tail = NULL;
+ struct ath_buf *bf;
+ LIST_HEAD(bf_q);
+ int duration = 0;
+ int max_duration;
+
+ max_duration =
+ sc->cur_chan->beacon.beacon_interval * 1000 *
+ sc->cur_chan->beacon.dtim_period / ATH_BCBUF;
+
+ do {
+ struct ath_frame_info *fi = get_frame_info(skb);
+
+ if (ath_tx_prepare(hw, skb, &txctl))
+ break;
+
+ bf = ath_tx_setup_buffer(sc, txctl.txq, NULL, skb);
+ if (!bf)
+ break;
+
+ bf->bf_lastbf = bf;
+ ath_set_rates(vif, NULL, bf);
+ ath_buf_set_rate(sc, bf, &info, fi->framelen, false);
+ duration += info.rates[0].PktDuration;
+ if (bf_tail)
+ bf_tail->bf_next = bf;
+
+ list_add_tail(&bf->list, &bf_q);
+ bf_tail = bf;
+ skb = NULL;
+
+ if (duration > max_duration)
+ break;
+
+ skb = ieee80211_get_buffered_bc(hw, vif);
+ } while(skb);
+
+ if (skb)
+ ieee80211_free_txskb(hw, skb);
+
+ if (list_empty(&bf_q))
+ return;
+
+ bf = list_first_entry(&bf_q, struct ath_buf, list);
+ hdr = (struct ieee80211_hdr *) bf->bf_mpdu->data;
+
+ if (hdr->frame_control & IEEE80211_FCTL_MOREDATA) {
+ hdr->frame_control &= ~IEEE80211_FCTL_MOREDATA;
+ dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
+ sizeof(*hdr), DMA_TO_DEVICE);
+ }
+
+ ath_txq_lock(sc, txctl.txq);
+ ath_tx_fill_desc(sc, bf, txctl.txq, 0);
+ ath_tx_txqaddbuf(sc, txctl.txq, &bf_q, false);
+ TX_STAT_INC(txctl.txq->axq_qnum, queued);
+ ath_txq_unlock(sc, txctl.txq);
+}
+
+/*****************/
+/* TX Completion */
+/*****************/
+
+static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
+ int tx_flags, struct ath_txq *txq)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
+ int padpos, padsize;
+ unsigned long flags;
+
+ ath_dbg(common, XMIT, "TX complete: skb: %p\n", skb);
+
+ if (sc->sc_ah->caldata)
+ set_bit(PAPRD_PACKET_SENT, &sc->sc_ah->caldata->cal_flags);
+
+ if (!(tx_flags & ATH_TX_ERROR)) {
+ if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
+ tx_info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
+ else
+ tx_info->flags |= IEEE80211_TX_STAT_ACK;
+ }
+
+ padpos = ieee80211_hdrlen(hdr->frame_control);
+ padsize = padpos & 3;
+ if (padsize && skb->len>padpos+padsize) {
+ /*
+ * Remove MAC header padding before giving the frame back to
+ * mac80211.
+ */
+ memmove(skb->data + padsize, skb->data, padpos);
+ skb_pull(skb, padsize);
+ }
+
+ spin_lock_irqsave(&sc->sc_pm_lock, flags);
+ if ((sc->ps_flags & PS_WAIT_FOR_TX_ACK) && !txq->axq_depth) {
+ sc->ps_flags &= ~PS_WAIT_FOR_TX_ACK;
+ ath_dbg(common, PS,
+ "Going back to sleep after having received TX status (0x%lx)\n",
+ sc->ps_flags & (PS_WAIT_FOR_BEACON |
+ PS_WAIT_FOR_CAB |
+ PS_WAIT_FOR_PSPOLL_DATA |
+ PS_WAIT_FOR_TX_ACK));
+ }
+ spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+
+ __skb_queue_tail(&txq->complete_q, skb);
+ ath_txq_skb_done(sc, txq, skb);
+}
+
+static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_txq *txq, struct list_head *bf_q,
+ struct ath_tx_status *ts, int txok)
+{
+ struct sk_buff *skb = bf->bf_mpdu;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ unsigned long flags;
+ int tx_flags = 0;
+
+ if (!txok)
+ tx_flags |= ATH_TX_ERROR;
+
+ if (ts->ts_status & ATH9K_TXERR_FILT)
+ tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
+
+ dma_unmap_single(sc->dev, bf->bf_buf_addr, skb->len, DMA_TO_DEVICE);
+ bf->bf_buf_addr = 0;
+ if (sc->tx99_state)
+ goto skip_tx_complete;
+
+ if (bf->bf_state.bfs_paprd) {
+ if (time_after(jiffies,
+ bf->bf_state.bfs_paprd_timestamp +
+ msecs_to_jiffies(ATH_PAPRD_TIMEOUT)))
+ dev_kfree_skb_any(skb);
+ else
+ complete(&sc->paprd_complete);
+ } else {
+ ath_debug_stat_tx(sc, bf, ts, txq, tx_flags);
+ ath_tx_complete(sc, skb, tx_flags, txq);
+ }
+skip_tx_complete:
+ /* At this point, skb (bf->bf_mpdu) is consumed...make sure we don't
+ * accidentally reference it later.
+ */
+ bf->bf_mpdu = NULL;
+
+ /*
+ * Return the list of ath_buf of this mpdu to free queue
+ */
+ spin_lock_irqsave(&sc->tx.txbuflock, flags);
+ list_splice_tail_init(bf_q, &sc->tx.txbuf);
+ spin_unlock_irqrestore(&sc->tx.txbuflock, flags);
+}
+
+static void ath_tx_rc_status(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_tx_status *ts, int nframes, int nbad,
+ int txok)
+{
+ struct sk_buff *skb = bf->bf_mpdu;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hw *hw = sc->hw;
+ struct ath_hw *ah = sc->sc_ah;
+ u8 i, tx_rateindex;
+
+ if (txok)
+ tx_info->status.ack_signal = ts->ts_rssi;
+
+ tx_rateindex = ts->ts_rateindex;
+ WARN_ON(tx_rateindex >= hw->max_rates);
+
+ if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
+ tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
+
+ BUG_ON(nbad > nframes);
+ }
+ tx_info->status.ampdu_len = nframes;
+ tx_info->status.ampdu_ack_len = nframes - nbad;
+
+ if ((ts->ts_status & ATH9K_TXERR_FILT) == 0 &&
+ (tx_info->flags & IEEE80211_TX_CTL_NO_ACK) == 0) {
+ /*
+ * If an underrun error is seen assume it as an excessive
+ * retry only if max frame trigger level has been reached
+ * (2 KB for single stream, and 4 KB for dual stream).
+ * Adjust the long retry as if the frame was tried
+ * hw->max_rate_tries times to affect how rate control updates
+ * PER for the failed rate.
+ * In case of congestion on the bus penalizing this type of
+ * underruns should help hardware actually transmit new frames
+ * successfully by eventually preferring slower rates.
+ * This itself should also alleviate congestion on the bus.
+ */
+ if (unlikely(ts->ts_flags & (ATH9K_TX_DATA_UNDERRUN |
+ ATH9K_TX_DELIM_UNDERRUN)) &&
+ ieee80211_is_data(hdr->frame_control) &&
+ ah->tx_trig_level >= sc->sc_ah->config.max_txtrig_level)
+ tx_info->status.rates[tx_rateindex].count =
+ hw->max_rate_tries;
+ }
+
+ for (i = tx_rateindex + 1; i < hw->max_rates; i++) {
+ tx_info->status.rates[i].count = 0;
+ tx_info->status.rates[i].idx = -1;
+ }
+
+ tx_info->status.rates[tx_rateindex].count = ts->ts_longretry + 1;
+}
+
+static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
+ struct ath_buf *bf, *lastbf, *bf_held = NULL;
+ struct list_head bf_head;
+ struct ath_desc *ds;
+ struct ath_tx_status ts;
+ int status;
+
+ ath_dbg(common, QUEUE, "tx queue %d (%x), link %p\n",
+ txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
+ txq->axq_link);
+
+ ath_txq_lock(sc, txq);
+ for (;;) {
+ if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
+ break;
+
+ if (list_empty(&txq->axq_q)) {
+ txq->axq_link = NULL;
+ ath_txq_schedule(sc, txq);
+ break;
+ }
+ bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
+
+ /*
+ * There is a race condition that a BH gets scheduled
+ * after sw writes TxE and before hw re-load the last
+ * descriptor to get the newly chained one.
+ * Software must keep the last DONE descriptor as a
+ * holding descriptor - software does so by marking
+ * it with the STALE flag.
+ */
+ bf_held = NULL;
+ if (bf->bf_state.stale) {
+ bf_held = bf;
+ if (list_is_last(&bf_held->list, &txq->axq_q))
+ break;
+
+ bf = list_entry(bf_held->list.next, struct ath_buf,
+ list);
+ }
+
+ lastbf = bf->bf_lastbf;
+ ds = lastbf->bf_desc;
+
+ memset(&ts, 0, sizeof(ts));
+ status = ath9k_hw_txprocdesc(ah, ds, &ts);
+ if (status == -EINPROGRESS)
+ break;
+
+ TX_STAT_INC(txq->axq_qnum, txprocdesc);
+
+ /*
+ * Remove ath_buf's of the same transmit unit from txq,
+ * however leave the last descriptor back as the holding
+ * descriptor for hw.
+ */
+ lastbf->bf_state.stale = true;
+ INIT_LIST_HEAD(&bf_head);
+ if (!list_is_singular(&lastbf->list))
+ list_cut_position(&bf_head,
+ &txq->axq_q, lastbf->list.prev);
+
+ if (bf_held) {
+ list_del(&bf_held->list);
+ ath_tx_return_buffer(sc, bf_held);
+ }
+
+ ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+ }
+ ath_txq_unlock_complete(sc, txq);
+}
+
+void ath_tx_tasklet(struct ath_softc *sc)
+{
+ struct ath_hw *ah = sc->sc_ah;
+ u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1) & ah->intr_txqs;
+ int i;
+
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
+ ath_tx_processq(sc, &sc->tx.txq[i]);
+ }
+}
+
+void ath_tx_edma_tasklet(struct ath_softc *sc)
+{
+ struct ath_tx_status ts;
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_txq *txq;
+ struct ath_buf *bf, *lastbf;
+ struct list_head bf_head;
+ struct list_head *fifo_list;
+ int status;
+
+ for (;;) {
+ if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
+ break;
+
+ status = ath9k_hw_txprocdesc(ah, NULL, (void *)&ts);
+ if (status == -EINPROGRESS)
+ break;
+ if (status == -EIO) {
+ ath_dbg(common, XMIT, "Error processing tx status\n");
+ break;
+ }
+
+ /* Process beacon completions separately */
+ if (ts.qid == sc->beacon.beaconq) {
+ sc->beacon.tx_processed = true;
+ sc->beacon.tx_last = !(ts.ts_status & ATH9K_TXERR_MASK);
+
+ if (ath9k_is_chanctx_enabled()) {
+ ath_chanctx_event(sc, NULL,
+ ATH_CHANCTX_EVENT_BEACON_SENT);
+ }
+
+ ath9k_csa_update(sc);
+ continue;
+ }
+
+ txq = &sc->tx.txq[ts.qid];
+
+ ath_txq_lock(sc, txq);
+
+ TX_STAT_INC(txq->axq_qnum, txprocdesc);
+
+ fifo_list = &txq->txq_fifo[txq->txq_tailidx];
+ if (list_empty(fifo_list)) {
+ ath_txq_unlock(sc, txq);
+ return;
+ }
+
+ bf = list_first_entry(fifo_list, struct ath_buf, list);
+ if (bf->bf_state.stale) {
+ list_del(&bf->list);
+ ath_tx_return_buffer(sc, bf);
+ bf = list_first_entry(fifo_list, struct ath_buf, list);
+ }
+
+ lastbf = bf->bf_lastbf;
+
+ INIT_LIST_HEAD(&bf_head);
+ if (list_is_last(&lastbf->list, fifo_list)) {
+ list_splice_tail_init(fifo_list, &bf_head);
+ INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
+
+ if (!list_empty(&txq->axq_q)) {
+ struct list_head bf_q;
+
+ INIT_LIST_HEAD(&bf_q);
+ txq->axq_link = NULL;
+ list_splice_tail_init(&txq->axq_q, &bf_q);
+ ath_tx_txqaddbuf(sc, txq, &bf_q, true);
+ }
+ } else {
+ lastbf->bf_state.stale = true;
+ if (bf != lastbf)
+ list_cut_position(&bf_head, fifo_list,
+ lastbf->list.prev);
+ }
+
+ ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);
+ ath_txq_unlock_complete(sc, txq);
+ }
+}
+
+/*****************/
+/* Init, Cleanup */
+/*****************/
+
+static int ath_txstatus_setup(struct ath_softc *sc, int size)
+{
+ struct ath_descdma *dd = &sc->txsdma;
+ u8 txs_len = sc->sc_ah->caps.txs_len;
+
+ dd->dd_desc_len = size * txs_len;
+ dd->dd_desc = dmam_alloc_coherent(sc->dev, dd->dd_desc_len,
+ &dd->dd_desc_paddr, GFP_KERNEL);
+ if (!dd->dd_desc)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int ath_tx_edma_init(struct ath_softc *sc)
+{
+ int err;
+
+ err = ath_txstatus_setup(sc, ATH_TXSTATUS_RING_SIZE);
+ if (!err)
+ ath9k_hw_setup_statusring(sc->sc_ah, sc->txsdma.dd_desc,
+ sc->txsdma.dd_desc_paddr,
+ ATH_TXSTATUS_RING_SIZE);
+
+ return err;
+}
+
+int ath_tx_init(struct ath_softc *sc, int nbufs)
+{
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ int error = 0;
+
+ spin_lock_init(&sc->tx.txbuflock);
+
+ error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
+ "tx", nbufs, 1, 1);
+ if (error != 0) {
+ ath_err(common,
+ "Failed to allocate tx descriptors: %d\n", error);
+ return error;
+ }
+
+ error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
+ "beacon", ATH_BCBUF, 1, 1);
+ if (error != 0) {
+ ath_err(common,
+ "Failed to allocate beacon descriptors: %d\n", error);
+ return error;
+ }
+
+ INIT_DELAYED_WORK(&sc->tx_complete_work, ath_tx_complete_poll_work);
+
+ if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
+ error = ath_tx_edma_init(sc);
+
+ return error;
+}
+
+void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
+{
+ struct ath_atx_tid *tid;
+ struct ath_atx_ac *ac;
+ int tidno, acno;
+
+ for (tidno = 0, tid = &an->tid[tidno];
+ tidno < IEEE80211_NUM_TIDS;
+ tidno++, tid++) {
+ tid->an = an;
+ tid->tidno = tidno;
+ tid->seq_start = tid->seq_next = 0;
+ tid->baw_size = WME_MAX_BA;
+ tid->baw_head = tid->baw_tail = 0;
+ tid->sched = false;
+ tid->active = false;
+ __skb_queue_head_init(&tid->buf_q);
+ __skb_queue_head_init(&tid->retry_q);
+ acno = TID_TO_WME_AC(tidno);
+ tid->ac = &an->ac[acno];
+ }
+
+ for (acno = 0, ac = &an->ac[acno];
+ acno < IEEE80211_NUM_ACS; acno++, ac++) {
+ ac->sched = false;
+ ac->clear_ps_filter = true;
+ ac->txq = sc->tx.txq_map[acno];
+ INIT_LIST_HEAD(&ac->tid_q);
+ }
+}
+
+void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
+{
+ struct ath_atx_ac *ac;
+ struct ath_atx_tid *tid;
+ struct ath_txq *txq;
+ int tidno;
+
+ for (tidno = 0, tid = &an->tid[tidno];
+ tidno < IEEE80211_NUM_TIDS; tidno++, tid++) {
+
+ ac = tid->ac;
+ txq = ac->txq;
+
+ ath_txq_lock(sc, txq);
+
+ if (tid->sched) {
+ list_del(&tid->list);
+ tid->sched = false;
+ }
+
+ if (ac->sched) {
+ list_del(&ac->list);
+ tid->ac->sched = false;
+ }
+
+ ath_tid_drain(sc, txq, tid);
+ tid->active = false;
+
+ ath_txq_unlock(sc, txq);
+ }
+}
+
+#ifdef CONFIG_ATH9K_TX99
+
+int ath9k_tx99_send(struct ath_softc *sc, struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ struct ath_buf *bf;
+ int padpos, padsize;
+
+ padpos = ieee80211_hdrlen(hdr->frame_control);
+ padsize = padpos & 3;
+
+ if (padsize && skb->len > padpos) {
+ if (skb_headroom(skb) < padsize) {
+ ath_dbg(common, XMIT,
+ "tx99 padding failed\n");
+ return -EINVAL;
+ }
+
+ skb_push(skb, padsize);
+ memmove(skb->data, skb->data + padsize, padpos);
+ }
+
+ fi->keyix = ATH9K_TXKEYIX_INVALID;
+ fi->framelen = skb->len + FCS_LEN;
+ fi->keytype = ATH9K_KEY_TYPE_CLEAR;
+
+ bf = ath_tx_setup_buffer(sc, txctl->txq, NULL, skb);
+ if (!bf) {
+ ath_dbg(common, XMIT, "tx99 buffer setup failed\n");
+ return -EINVAL;
+ }
+
+ ath_set_rates(sc->tx99_vif, NULL, bf);
+
+ ath9k_hw_set_desc_link(sc->sc_ah, bf->bf_desc, bf->bf_daddr);
+ ath9k_hw_tx99_start(sc->sc_ah, txctl->txq->axq_qnum);
+
+ ath_tx_send_normal(sc, txctl->txq, NULL, skb);
+
+ return 0;
+}
+
+#endif /* CONFIG_ATH9K_TX99 */
Code Review / kvmfornfv.git / blobdiff