ath9k: Add new Atheros IEEE 802.11n driver
This adds the new mac80211 11n ath9k Atheros driver. Only STA support
is currently enabled and tested.
Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Jack Howarth <howarth@bromo.msbb.uc.edu>
Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
new file mode 100644
index 0000000..f0297ee
--- /dev/null
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -0,0 +1,2870 @@
+/*
+ * Copyright (c) 2008 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.
+ */
+
+/*
+ * Implementation of transmit path.
+ */
+
+#include "core.h"
+
+#define BITS_PER_BYTE 8
+#define OFDM_PLCP_BITS 22
+#define HT_RC_2_MCS(_rc) ((_rc) & 0x0f)
+#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 NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
+#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
+
+#define OFDM_SIFS_TIME 16
+
+static u32 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 */
+ { 52, 108 }, /* 8: BPSK */
+ { 104, 216 }, /* 9: QPSK 1/2 */
+ { 156, 324 }, /* 10: QPSK 3/4 */
+ { 208, 432 }, /* 11: 16-QAM 1/2 */
+ { 312, 648 }, /* 12: 16-QAM 3/4 */
+ { 416, 864 }, /* 13: 64-QAM 2/3 */
+ { 468, 972 }, /* 14: 64-QAM 3/4 */
+ { 520, 1080 }, /* 15: 64-QAM 5/6 */
+};
+
+#define IS_HT_RATE(_rate) ((_rate) & 0x80)
+
+/*
+ * Insert a chain of ath_buf (descriptors) on a multicast txq
+ * but do NOT start tx DMA on this queue.
+ * NB: must be called with txq lock held
+ */
+
+static void ath_tx_mcastqaddbuf(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct list_head *head)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_buf *bf;
+
+ if (list_empty(head))
+ return;
+
+ /*
+ * Insert the frame on the outbound list and
+ * pass it on to the hardware.
+ */
+ bf = list_first_entry(head, struct ath_buf, list);
+
+ /*
+ * The CAB queue is started from the SWBA handler since
+ * frames only go out on DTIM and to avoid possible races.
+ */
+ ath9k_hw_set_interrupts(ah, 0);
+
+ /*
+ * If there is anything in the mcastq, we want to set
+ * the "more data" bit in the last item in the queue to
+ * indicate that there is "more data". It makes sense to add
+ * it here since you are *always* going to have
+ * more data when adding to this queue, no matter where
+ * you call from.
+ */
+
+ if (txq->axq_depth) {
+ struct ath_buf *lbf;
+ struct ieee80211_hdr *hdr;
+
+ /*
+ * Add the "more data flag" to the last frame
+ */
+
+ lbf = list_entry(txq->axq_q.prev, struct ath_buf, list);
+ hdr = (struct ieee80211_hdr *)
+ ((struct sk_buff *)(lbf->bf_mpdu))->data;
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+ }
+
+ /*
+ * Now, concat the frame onto the queue
+ */
+ list_splice_tail_init(head, &txq->axq_q);
+ txq->axq_depth++;
+ txq->axq_totalqueued++;
+ txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list);
+
+ DPRINTF(sc, ATH_DBG_QUEUE,
+ "%s: txq depth = %d\n", __func__, txq->axq_depth);
+ if (txq->axq_link != NULL) {
+ *txq->axq_link = bf->bf_daddr;
+ DPRINTF(sc, ATH_DBG_XMIT,
+ "%s: link[%u](%p)=%llx (%p)\n",
+ __func__,
+ txq->axq_qnum, txq->axq_link,
+ ito64(bf->bf_daddr), bf->bf_desc);
+ }
+ txq->axq_link = &(bf->bf_lastbf->bf_desc->ds_link);
+ ath9k_hw_set_interrupts(ah, sc->sc_imask);
+}
+
+/*
+ * Insert a chain of ath_buf (descriptors) on a txq and
+ * assume the descriptors are already chained together by caller.
+ * NB: must be called with txq lock held
+ */
+
+static void ath_tx_txqaddbuf(struct ath_softc *sc,
+ struct ath_txq *txq, struct list_head *head)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_buf *bf;
+ /*
+ * Insert the frame on the outbound list and
+ * pass it on to the hardware.
+ */
+
+ if (list_empty(head))
+ return;
+
+ bf = list_first_entry(head, struct ath_buf, list);
+
+ list_splice_tail_init(head, &txq->axq_q);
+ txq->axq_depth++;
+ txq->axq_totalqueued++;
+ txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list);
+
+ DPRINTF(sc, ATH_DBG_QUEUE,
+ "%s: txq depth = %d\n", __func__, txq->axq_depth);
+
+ if (txq->axq_link == NULL) {
+ ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
+ DPRINTF(sc, ATH_DBG_XMIT,
+ "%s: TXDP[%u] = %llx (%p)\n",
+ __func__, txq->axq_qnum,
+ ito64(bf->bf_daddr), bf->bf_desc);
+ } else {
+ *txq->axq_link = bf->bf_daddr;
+ DPRINTF(sc, ATH_DBG_XMIT, "%s: link[%u] (%p)=%llx (%p)\n",
+ __func__,
+ txq->axq_qnum, txq->axq_link,
+ ito64(bf->bf_daddr), bf->bf_desc);
+ }
+ txq->axq_link = &(bf->bf_lastbf->bf_desc->ds_link);
+ ath9k_hw_txstart(ah, txq->axq_qnum);
+}
+
+/* Get transmit rate index using rate in Kbps */
+
+static int ath_tx_findindex(const struct ath9k_rate_table *rt, int rate)
+{
+ int i;
+ int ndx = 0;
+
+ for (i = 0; i < rt->rateCount; i++) {
+ if (rt->info[i].rateKbps == rate) {
+ ndx = i;
+ break;
+ }
+ }
+
+ return ndx;
+}
+
+/* Check if it's okay to send out aggregates */
+
+static int ath_aggr_query(struct ath_softc *sc,
+ struct ath_node *an, u8 tidno)
+{
+ struct ath_atx_tid *tid;
+ tid = ATH_AN_2_TID(an, tidno);
+
+ if (tid->addba_exchangecomplete || tid->addba_exchangeinprogress)
+ return 1;
+ else
+ return 0;
+}
+
+static enum ath9k_pkt_type get_hal_packet_type(struct ieee80211_hdr *hdr)
+{
+ enum ath9k_pkt_type htype;
+ __le16 fc;
+
+ fc = hdr->frame_control;
+
+ /* Calculate Atheros packet type from IEEE80211 packet header */
+
+ 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 fill_min_rates(struct sk_buff *skb, struct ath_tx_control *txctl)
+{
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_tx_info_priv *tx_info_priv;
+ __le16 fc;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+ tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
+
+ if (ieee80211_is_mgmt(fc) || ieee80211_is_ctl(fc)) {
+ txctl->use_minrate = 1;
+ txctl->min_rate = tx_info_priv->min_rate;
+ } else if (ieee80211_is_data(fc)) {
+ if (ieee80211_is_nullfunc(fc) ||
+ /* Port Access Entity (IEEE 802.1X) */
+ (skb->protocol == cpu_to_be16(0x888E))) {
+ txctl->use_minrate = 1;
+ txctl->min_rate = tx_info_priv->min_rate;
+ }
+ if (is_multicast_ether_addr(hdr->addr1))
+ txctl->mcast_rate = tx_info_priv->min_rate;
+ }
+
+}
+
+/* This function will setup additional txctl information, mostly rate stuff */
+/* FIXME: seqno, ps */
+static int ath_tx_prepare(struct ath_softc *sc,
+ struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ieee80211_hw *hw = sc->hw;
+ struct ieee80211_hdr *hdr;
+ struct ath_rc_series *rcs;
+ struct ath_txq *txq = NULL;
+ const struct ath9k_rate_table *rt;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_tx_info_priv *tx_info_priv;
+ int hdrlen;
+ u8 rix, antenna;
+ __le16 fc;
+ u8 *qc;
+
+ memset(txctl, 0, sizeof(struct ath_tx_control));
+
+ txctl->dev = sc;
+ hdr = (struct ieee80211_hdr *)skb->data;
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+ fc = hdr->frame_control;
+
+ rt = sc->sc_currates;
+ BUG_ON(!rt);
+
+ /* Fill misc fields */
+
+ spin_lock_bh(&sc->node_lock);
+ txctl->an = ath_node_get(sc, hdr->addr1);
+ /* create a temp node, if the node is not there already */
+ if (!txctl->an)
+ txctl->an = ath_node_attach(sc, hdr->addr1, 0);
+ spin_unlock_bh(&sc->node_lock);
+
+ if (ieee80211_is_data_qos(fc)) {
+ qc = ieee80211_get_qos_ctl(hdr);
+ txctl->tidno = qc[0] & 0xf;
+ }
+
+ txctl->if_id = 0;
+ txctl->nextfraglen = 0;
+ txctl->frmlen = skb->len + FCS_LEN - (hdrlen & 3);
+ txctl->txpower = MAX_RATE_POWER; /* FIXME */
+
+ /* Fill Key related fields */
+
+ txctl->keytype = ATH9K_KEY_TYPE_CLEAR;
+ txctl->keyix = ATH9K_TXKEYIX_INVALID;
+
+ if (tx_info->control.hw_key) {
+ txctl->keyix = tx_info->control.hw_key->hw_key_idx;
+ txctl->frmlen += tx_info->control.icv_len;
+
+ if (sc->sc_keytype == ATH9K_CIPHER_WEP)
+ txctl->keytype = ATH9K_KEY_TYPE_WEP;
+ else if (sc->sc_keytype == ATH9K_CIPHER_TKIP)
+ txctl->keytype = ATH9K_KEY_TYPE_TKIP;
+ else if (sc->sc_keytype == ATH9K_CIPHER_AES_CCM)
+ txctl->keytype = ATH9K_KEY_TYPE_AES;
+ }
+
+ /* Fill packet type */
+
+ txctl->atype = get_hal_packet_type(hdr);
+
+ /* Fill qnum */
+
+ txctl->qnum = ath_get_hal_qnum(skb_get_queue_mapping(skb), sc);
+ txq = &sc->sc_txq[txctl->qnum];
+ spin_lock_bh(&txq->axq_lock);
+
+ /* Try to avoid running out of descriptors */
+ if (txq->axq_depth >= (ATH_TXBUF - 20)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: TX queue: %d is full, depth: %d\n",
+ __func__,
+ txctl->qnum,
+ txq->axq_depth);
+ ieee80211_stop_queue(hw, skb_get_queue_mapping(skb));
+ txq->stopped = 1;
+ spin_unlock_bh(&txq->axq_lock);
+ return -1;
+ }
+
+ spin_unlock_bh(&txq->axq_lock);
+
+ /* Fill rate */
+
+ fill_min_rates(skb, txctl);
+
+ /* Fill flags */
+
+ txctl->flags = ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
+
+ if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
+ tx_info->flags |= ATH9K_TXDESC_NOACK;
+ if (tx_info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
+ tx_info->flags |= ATH9K_TXDESC_RTSENA;
+
+ /*
+ * Setup for rate calculations.
+ */
+ tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
+ rcs = tx_info_priv->rcs;
+
+ if (ieee80211_is_data(fc) && !txctl->use_minrate) {
+
+ /* Enable HT only for DATA frames and not for EAPOL */
+ txctl->ht = (hw->conf.ht_conf.ht_supported &&
+ (tx_info->flags & IEEE80211_TX_CTL_AMPDU));
+
+ if (is_multicast_ether_addr(hdr->addr1)) {
+ rcs[0].rix = (u8)
+ ath_tx_findindex(rt, txctl->mcast_rate);
+
+ /*
+ * mcast packets are not re-tried.
+ */
+ rcs[0].tries = 1;
+ }
+ /* For HT capable stations, we save tidno for later use.
+ * We also override seqno set by upper layer with the one
+ * in tx aggregation state.
+ *
+ * First, the fragmentation stat is determined.
+ * If fragmentation is on, the sequence number is
+ * not overridden, since it has been
+ * incremented by the fragmentation routine.
+ */
+ if (likely(!(txctl->flags & ATH9K_TXDESC_FRAG_IS_ON)) &&
+ txctl->ht && sc->sc_txaggr) {
+ struct ath_atx_tid *tid;
+
+ tid = ATH_AN_2_TID(txctl->an, txctl->tidno);
+
+ hdr->seq_ctrl = cpu_to_le16(tid->seq_next <<
+ IEEE80211_SEQ_SEQ_SHIFT);
+ txctl->seqno = tid->seq_next;
+ INCR(tid->seq_next, IEEE80211_SEQ_MAX);
+ }
+ } else {
+ /* for management and control frames,
+ * or for NULL and EAPOL frames */
+ if (txctl->min_rate)
+ rcs[0].rix = ath_rate_findrateix(sc, txctl->min_rate);
+ else
+ rcs[0].rix = sc->sc_minrateix;
+ rcs[0].tries = ATH_MGT_TXMAXTRY;
+ }
+ rix = rcs[0].rix;
+
+ /*
+ * Calculate duration. This logically belongs in the 802.11
+ * layer but it lacks sufficient information to calculate it.
+ */
+ if ((txctl->flags & ATH9K_TXDESC_NOACK) == 0 && !ieee80211_is_ctl(fc)) {
+ u16 dur;
+ /*
+ * XXX not right with fragmentation.
+ */
+ if (sc->sc_flags & ATH_PREAMBLE_SHORT)
+ dur = rt->info[rix].spAckDuration;
+ else
+ dur = rt->info[rix].lpAckDuration;
+
+ if (le16_to_cpu(hdr->frame_control) &
+ IEEE80211_FCTL_MOREFRAGS) {
+ dur += dur; /* Add additional 'SIFS + ACK' */
+
+ /*
+ ** Compute size of next fragment in order to compute
+ ** durations needed to update NAV.
+ ** The last fragment uses the ACK duration only.
+ ** Add time for next fragment.
+ */
+ dur += ath9k_hw_computetxtime(sc->sc_ah, rt,
+ txctl->nextfraglen,
+ rix, sc->sc_flags & ATH_PREAMBLE_SHORT);
+ }
+
+ if (ieee80211_has_morefrags(fc) ||
+ (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
+ /*
+ ** Force hardware to use computed duration for next
+ ** fragment by disabling multi-rate retry, which
+ ** updates duration based on the multi-rate
+ ** duration table.
+ */
+ rcs[1].tries = rcs[2].tries = rcs[3].tries = 0;
+ rcs[1].rix = rcs[2].rix = rcs[3].rix = 0;
+ /* reset tries but keep rate index */
+ rcs[0].tries = ATH_TXMAXTRY;
+ }
+
+ hdr->duration_id = cpu_to_le16(dur);
+ }
+
+ /*
+ * Determine if a tx interrupt should be generated for
+ * this descriptor. We take a tx interrupt to reap
+ * descriptors when the h/w hits an EOL condition or
+ * when the descriptor is specifically marked to generate
+ * an interrupt. We periodically mark descriptors in this
+ * way to insure timely replenishing of the supply needed
+ * for sending frames. Defering interrupts reduces system
+ * load and potentially allows more concurrent work to be
+ * done but if done to aggressively can cause senders to
+ * backup.
+ *
+ * NB: use >= to deal with sc_txintrperiod changing
+ * dynamically through sysctl.
+ */
+ spin_lock_bh(&txq->axq_lock);
+ if ((++txq->axq_intrcnt >= sc->sc_txintrperiod)) {
+ txctl->flags |= ATH9K_TXDESC_INTREQ;
+ txq->axq_intrcnt = 0;
+ }
+ spin_unlock_bh(&txq->axq_lock);
+
+ if (is_multicast_ether_addr(hdr->addr1)) {
+ antenna = sc->sc_mcastantenna + 1;
+ sc->sc_mcastantenna = (sc->sc_mcastantenna + 1) & 0x1;
+ } else
+ antenna = sc->sc_txantenna;
+
+#ifdef USE_LEGACY_HAL
+ txctl->antenna = antenna;
+#endif
+ return 0;
+}
+
+/* To complete a chain of buffers associated a frame */
+
+static void ath_tx_complete_buf(struct ath_softc *sc,
+ struct ath_buf *bf,
+ struct list_head *bf_q,
+ int txok, int sendbar)
+{
+ struct sk_buff *skb = bf->bf_mpdu;
+ struct ath_xmit_status tx_status;
+ dma_addr_t *pa;
+
+ /*
+ * Set retry information.
+ * NB: Don't use the information in the descriptor, because the frame
+ * could be software retried.
+ */
+ tx_status.retries = bf->bf_retries;
+ tx_status.flags = 0;
+
+ if (sendbar)
+ tx_status.flags = ATH_TX_BAR;
+
+ if (!txok) {
+ tx_status.flags |= ATH_TX_ERROR;
+
+ if (bf->bf_isxretried)
+ tx_status.flags |= ATH_TX_XRETRY;
+ }
+ /* Unmap this frame */
+ pa = get_dma_mem_context(bf, bf_dmacontext);
+ pci_unmap_single(sc->pdev,
+ *pa,
+ skb->len,
+ PCI_DMA_TODEVICE);
+ /* complete this frame */
+ ath_tx_complete(sc, skb, &tx_status, bf->bf_node);
+
+ /*
+ * Return the list of ath_buf of this mpdu to free queue
+ */
+ spin_lock_bh(&sc->sc_txbuflock);
+ list_splice_tail_init(bf_q, &sc->sc_txbuf);
+ spin_unlock_bh(&sc->sc_txbuflock);
+}
+
+/*
+ * queue up a dest/ac pair for tx scheduling
+ * NB: must be called with txq lock held
+ */
+
+static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
+{
+ struct ath_atx_ac *ac = tid->ac;
+
+ /*
+ * if tid is paused, hold off
+ */
+ if (tid->paused)
+ return;
+
+ /*
+ * add tid to ac atmost once
+ */
+ if (tid->sched)
+ return;
+
+ tid->sched = true;
+ list_add_tail(&tid->list, &ac->tid_q);
+
+ /*
+ * add node ac to txq atmost once
+ */
+ if (ac->sched)
+ return;
+
+ ac->sched = true;
+ list_add_tail(&ac->list, &txq->axq_acq);
+}
+
+/* pause a tid */
+
+static void ath_tx_pause_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+{
+ struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
+
+ spin_lock_bh(&txq->axq_lock);
+
+ tid->paused++;
+
+ spin_unlock_bh(&txq->axq_lock);
+}
+
+/* resume a tid and schedule aggregate */
+
+void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+{
+ struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
+
+ ASSERT(tid->paused > 0);
+ spin_lock_bh(&txq->axq_lock);
+
+ tid->paused--;
+
+ if (tid->paused > 0)
+ goto unlock;
+
+ if (list_empty(&tid->buf_q))
+ goto unlock;
+
+ /*
+ * Add this TID to scheduler and try to send out aggregates
+ */
+ ath_tx_queue_tid(txq, tid);
+ ath_txq_schedule(sc, txq);
+unlock:
+ spin_unlock_bh(&txq->axq_lock);
+}
+
+/* Compute the number of bad frames */
+
+static int ath_tx_num_badfrms(struct ath_softc *sc,
+ struct ath_buf *bf, int txok)
+{
+ struct ath_node *an = bf->bf_node;
+ int isnodegone = (an->an_flags & ATH_NODE_CLEAN);
+ struct ath_buf *bf_last = bf->bf_lastbf;
+ struct ath_desc *ds = bf_last->bf_desc;
+ u16 seq_st = 0;
+ u32 ba[WME_BA_BMP_SIZE >> 5];
+ int ba_index;
+ int nbad = 0;
+ int isaggr = 0;
+
+ if (isnodegone || ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED)
+ return 0;
+
+ isaggr = bf->bf_isaggr;
+ if (isaggr) {
+ seq_st = ATH_DS_BA_SEQ(ds);
+ memcpy(ba, ATH_DS_BA_BITMAP(ds), WME_BA_BMP_SIZE >> 3);
+ }
+
+ while (bf) {
+ ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno);
+ if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
+ nbad++;
+
+ bf = bf->bf_next;
+ }
+
+ return nbad;
+}
+
+static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
+{
+ struct sk_buff *skb;
+ struct ieee80211_hdr *hdr;
+
+ bf->bf_isretried = 1;
+ bf->bf_retries++;
+
+ skb = bf->bf_mpdu;
+ hdr = (struct ieee80211_hdr *)skb->data;
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
+}
+
+/* Update block ack window */
+
+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);
+
+ tid->tx_buf[cindex] = NULL;
+
+ while (tid->baw_head != tid->baw_tail && !tid->tx_buf[tid->baw_head]) {
+ INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+ INCR(tid->baw_head, ATH_TID_MAX_BUFS);
+ }
+}
+
+/*
+ * ath_pkt_dur - compute packet duration (NB: not NAV)
+ *
+ * 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,
+ struct ath_buf *bf,
+ int width,
+ int half_gi,
+ bool shortPreamble)
+{
+ const struct ath9k_rate_table *rt = sc->sc_currates;
+ u32 nbits, nsymbits, duration, nsymbols;
+ u8 rc;
+ int streams, pktlen;
+
+ pktlen = bf->bf_isaggr ? bf->bf_al : bf->bf_frmlen;
+ rc = rt->info[rix].rateCode;
+
+ /*
+ * for legacy rates, use old function to compute packet duration
+ */
+ if (!IS_HT_RATE(rc))
+ return ath9k_hw_computetxtime(sc->sc_ah,
+ rt,
+ pktlen,
+ rix,
+ shortPreamble);
+ /*
+ * find number of symbols: PLCP + data
+ */
+ nbits = (pktlen << 3) + OFDM_PLCP_BITS;
+ nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
+ 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
+ */
+ streams = HT_RC_2_STREAMS(rc);
+ duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
+ return duration;
+}
+
+/* Rate module function to set rate related fields in tx descriptor */
+
+static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ const struct ath9k_rate_table *rt;
+ struct ath_desc *ds = bf->bf_desc;
+ struct ath_desc *lastds = bf->bf_lastbf->bf_desc;
+ struct ath9k_11n_rate_series series[4];
+ int i, flags, rtsctsena = 0, dynamic_mimops = 0;
+ u32 ctsduration = 0;
+ u8 rix = 0, cix, ctsrate = 0;
+ u32 aggr_limit_with_rts = sc->sc_rtsaggrlimit;
+ struct ath_node *an = (struct ath_node *) bf->bf_node;
+
+ /*
+ * get the cix for the lowest valid rix.
+ */
+ rt = sc->sc_currates;
+ for (i = 4; i--;) {
+ if (bf->bf_rcs[i].tries) {
+ rix = bf->bf_rcs[i].rix;
+ break;
+ }
+ }
+ flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA));
+ cix = rt->info[rix].controlRate;
+
+ /*
+ * If 802.11g protection is enabled, determine whether
+ * to use RTS/CTS or just CTS. Note that this is only
+ * done for OFDM/HT unicast frames.
+ */
+ if (sc->sc_protmode != PROT_M_NONE &&
+ (rt->info[rix].phy == PHY_OFDM ||
+ rt->info[rix].phy == PHY_HT) &&
+ (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) {
+ if (sc->sc_protmode == PROT_M_RTSCTS)
+ flags = ATH9K_TXDESC_RTSENA;
+ else if (sc->sc_protmode == PROT_M_CTSONLY)
+ flags = ATH9K_TXDESC_CTSENA;
+
+ cix = rt->info[sc->sc_protrix].controlRate;
+ rtsctsena = 1;
+ }
+
+ /* For 11n, the default behavior is to enable RTS for
+ * hw retried frames. We enable the global flag here and
+ * let rate series flags determine which rates will actually
+ * use RTS.
+ */
+ if (ah->ah_caps.halHTSupport && bf->bf_isdata) {
+ BUG_ON(!an);
+ /*
+ * 802.11g protection not needed, use our default behavior
+ */
+ if (!rtsctsena)
+ flags = ATH9K_TXDESC_RTSENA;
+ /*
+ * For dynamic MIMO PS, RTS needs to precede the first aggregate
+ * and the second aggregate should have any protection at all.
+ */
+ if (an->an_smmode == ATH_SM_PWRSAV_DYNAMIC) {
+ if (!bf->bf_aggrburst) {
+ flags = ATH9K_TXDESC_RTSENA;
+ dynamic_mimops = 1;
+ } else {
+ flags = 0;
+ }
+ }
+ }
+
+ /*
+ * Set protection if aggregate protection on
+ */
+ if (sc->sc_config.ath_aggr_prot &&
+ (!bf->bf_isaggr || (bf->bf_isaggr && bf->bf_al < 8192))) {
+ flags = ATH9K_TXDESC_RTSENA;
+ cix = rt->info[sc->sc_protrix].controlRate;
+ rtsctsena = 1;
+ }
+
+ /*
+ * For AR5416 - RTS cannot be followed by a frame larger than 8K.
+ */
+ if (bf->bf_isaggr && (bf->bf_al > aggr_limit_with_rts)) {
+ /*
+ * Ensure that in the case of SM Dynamic power save
+ * while we are bursting the second aggregate the
+ * RTS is cleared.
+ */
+ flags &= ~(ATH9K_TXDESC_RTSENA);
+ }
+
+ /*
+ * CTS transmit rate is derived from the transmit rate
+ * by looking in the h/w rate table. We must also factor
+ * in whether or not a short preamble is to be used.
+ */
+ /* NB: cix is set above where RTS/CTS is enabled */
+ BUG_ON(cix == 0xff);
+ ctsrate = rt->info[cix].rateCode |
+ (bf->bf_shpreamble ? rt->info[cix].shortPreamble : 0);
+
+ /*
+ * Setup HAL rate series
+ */
+ memzero(series, sizeof(struct ath9k_11n_rate_series) * 4);
+
+ for (i = 0; i < 4; i++) {
+ if (!bf->bf_rcs[i].tries)
+ continue;
+
+ rix = bf->bf_rcs[i].rix;
+
+ series[i].Rate = rt->info[rix].rateCode |
+ (bf->bf_shpreamble ? rt->info[rix].shortPreamble : 0);
+
+ series[i].Tries = bf->bf_rcs[i].tries;
+
+ series[i].RateFlags = (
+ (bf->bf_rcs[i].flags & ATH_RC_RTSCTS_FLAG) ?
+ ATH9K_RATESERIES_RTS_CTS : 0) |
+ ((bf->bf_rcs[i].flags & ATH_RC_CW40_FLAG) ?
+ ATH9K_RATESERIES_2040 : 0) |
+ ((bf->bf_rcs[i].flags & ATH_RC_SGI_FLAG) ?
+ ATH9K_RATESERIES_HALFGI : 0);
+
+ series[i].PktDuration = ath_pkt_duration(
+ sc, rix, bf,
+ (bf->bf_rcs[i].flags & ATH_RC_CW40_FLAG) != 0,
+ (bf->bf_rcs[i].flags & ATH_RC_SGI_FLAG),
+ bf->bf_shpreamble);
+
+ if ((an->an_smmode == ATH_SM_PWRSAV_STATIC) &&
+ (bf->bf_rcs[i].flags & ATH_RC_DS_FLAG) == 0) {
+ /*
+ * When sending to an HT node that has enabled static
+ * SM/MIMO power save, send at single stream rates but
+ * use maximum allowed transmit chains per user,
+ * hardware, regulatory, or country limits for
+ * better range.
+ */
+ series[i].ChSel = sc->sc_tx_chainmask;
+ } else {
+ if (bf->bf_ht)
+ series[i].ChSel =
+ ath_chainmask_sel_logic(sc, an);
+ else
+ series[i].ChSel = sc->sc_tx_chainmask;
+ }
+
+ if (rtsctsena)
+ series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+
+ /*
+ * Set RTS for all rates if node is in dynamic powersave
+ * mode and we are using dual stream rates.
+ */
+ if (dynamic_mimops && (bf->bf_rcs[i].flags & ATH_RC_DS_FLAG))
+ series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+ }
+
+ /*
+ * For non-HT devices, calculate RTS/CTS duration in software
+ * and disable multi-rate retry.
+ */
+ if (flags && !ah->ah_caps.halHTSupport) {
+ /*
+ * Compute the transmit duration based on the frame
+ * size and the size of an ACK frame. We call into the
+ * HAL to do the computation since it depends on the
+ * characteristics of the actual PHY being used.
+ *
+ * NB: CTS is assumed the same size as an ACK so we can
+ * use the precalculated ACK durations.
+ */
+ if (flags & ATH9K_TXDESC_RTSENA) { /* SIFS + CTS */
+ ctsduration += bf->bf_shpreamble ?
+ rt->info[cix].spAckDuration :
+ rt->info[cix].lpAckDuration;
+ }
+
+ ctsduration += series[0].PktDuration;
+
+ if ((bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) { /* SIFS + ACK */
+ ctsduration += bf->bf_shpreamble ?
+ rt->info[rix].spAckDuration :
+ rt->info[rix].lpAckDuration;
+ }
+
+ /*
+ * Disable multi-rate retry when using RTS/CTS by clearing
+ * series 1, 2 and 3.
+ */
+ memzero(&series[1], sizeof(struct ath9k_11n_rate_series) * 3);
+ }
+
+ /*
+ * set dur_update_en for l-sig computation except for PS-Poll frames
+ */
+ ath9k_hw_set11n_ratescenario(ah, ds, lastds,
+ !bf->bf_ispspoll,
+ ctsrate,
+ ctsduration,
+ series, 4, flags);
+ if (sc->sc_config.ath_aggr_prot && flags)
+ ath9k_hw_set11n_burstduration(ah, ds, 8192);
+}
+
+/*
+ * Function to send a normal HT (non-AMPDU) frame
+ * NB: must be called with txq lock held
+ */
+
+static int ath_tx_send_normal(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct list_head *bf_head)
+{
+ struct ath_buf *bf;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_tx_info_priv *tx_info_priv;
+
+ BUG_ON(list_empty(bf_head));
+
+ bf = list_first_entry(bf_head, struct ath_buf, list);
+ bf->bf_isampdu = 0; /* regular HT frame */
+
+ skb = (struct sk_buff *)bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
+ memcpy(bf->bf_rcs, tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0]));
+
+ /* update starting sequence number for subsequent ADDBA request */
+ INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+
+ /* Queue to h/w without aggregation */
+ bf->bf_nframes = 1;
+ bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */
+ ath_buf_set_rate(sc, bf);
+ ath_tx_txqaddbuf(sc, txq, bf_head);
+
+ return 0;
+}
+
+/* flush tid's software queue and send frames as non-ampdu's */
+
+static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
+{
+ struct ath_txq *txq = &sc->sc_txq[tid->ac->qnum];
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ INIT_LIST_HEAD(&bf_head);
+
+ ASSERT(tid->paused > 0);
+ spin_lock_bh(&txq->axq_lock);
+
+ tid->paused--;
+
+ if (tid->paused > 0) {
+ spin_unlock_bh(&txq->axq_lock);
+ return;
+ }
+
+ while (!list_empty(&tid->buf_q)) {
+ bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+ ASSERT(!bf->bf_isretried);
+ list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
+ ath_tx_send_normal(sc, txq, tid, &bf_head);
+ }
+
+ spin_unlock_bh(&txq->axq_lock);
+}
+
+/* Completion routine of an aggregate */
+
+static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_buf *bf,
+ struct list_head *bf_q,
+ int txok)
+{
+ struct ath_node *an = bf->bf_node;
+ struct ath_atx_tid *tid = ATH_AN_2_TID(an, bf->bf_tidno);
+ struct ath_buf *bf_last = bf->bf_lastbf;
+ struct ath_desc *ds = bf_last->bf_desc;
+ struct ath_buf *bf_next, *bf_lastq = NULL;
+ struct list_head bf_head, bf_pending;
+ u16 seq_st = 0;
+ u32 ba[WME_BA_BMP_SIZE >> 5];
+ int isaggr, txfail, txpending, sendbar = 0, needreset = 0;
+ int isnodegone = (an->an_flags & ATH_NODE_CLEAN);
+
+ isaggr = bf->bf_isaggr;
+ if (isaggr) {
+ if (txok) {
+ if (ATH_DS_TX_BA(ds)) {
+ /*
+ * extract starting sequence and
+ * block-ack bitmap
+ */
+ seq_st = ATH_DS_BA_SEQ(ds);
+ memcpy(ba,
+ ATH_DS_BA_BITMAP(ds),
+ WME_BA_BMP_SIZE >> 3);
+ } else {
+ memzero(ba, WME_BA_BMP_SIZE >> 3);
+
+ /*
+ * 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_opmode == ATH9K_M_STA)
+ needreset = 1;
+ }
+ } else {
+ memzero(ba, WME_BA_BMP_SIZE >> 3);
+ }
+ }
+
+ INIT_LIST_HEAD(&bf_pending);
+ INIT_LIST_HEAD(&bf_head);
+
+ while (bf) {
+ txfail = txpending = 0;
+ bf_next = bf->bf_next;
+
+ if (ATH_BA_ISSET(ba, ATH_BA_INDEX(seq_st, bf->bf_seqno))) {
+ /* transmit completion, subframe is
+ * acked by block ack */
+ } else if (!isaggr && txok) {
+ /* transmit completion */
+ } else {
+
+ if (!tid->cleanup_inprogress && !isnodegone &&
+ ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) {
+ if (bf->bf_retries < ATH_MAX_SW_RETRIES) {
+ ath_tx_set_retry(sc, bf);
+ txpending = 1;
+ } else {
+ bf->bf_isxretried = 1;
+ txfail = 1;
+ sendbar = 1;
+ }
+ } else {
+ /*
+ * cleanup in progress, just fail
+ * the un-acked sub-frames
+ */
+ txfail = 1;
+ }
+ }
+ /*
+ * Remove ath_buf's of this sub-frame from aggregate queue.
+ */
+ if (bf_next == NULL) { /* last subframe in the aggregate */
+ ASSERT(bf->bf_lastfrm == bf_last);
+
+ /*
+ * The last descriptor of the last sub frame could be
+ * a holding descriptor for h/w. If that's the case,
+ * bf->bf_lastfrm won't be in the bf_q.
+ * Make sure we handle bf_q properly here.
+ */
+
+ if (!list_empty(bf_q)) {
+ bf_lastq = list_entry(bf_q->prev,
+ struct ath_buf, list);
+ list_cut_position(&bf_head,
+ bf_q, &bf_lastq->list);
+ } else {
+ /*
+ * XXX: if the last subframe only has one
+ * descriptor which is also being used as
+ * a holding descriptor. Then the ath_buf
+ * is not in the bf_q at all.
+ */
+ INIT_LIST_HEAD(&bf_head);
+ }
+ } else {
+ ASSERT(!list_empty(bf_q));
+ list_cut_position(&bf_head,
+ bf_q, &bf->bf_lastfrm->list);
+ }
+
+ if (!txpending) {
+ /*
+ * complete the acked-ones/xretried ones; update
+ * block-ack window
+ */
+ spin_lock_bh(&txq->axq_lock);
+ ath_tx_update_baw(sc, tid, bf->bf_seqno);
+ spin_unlock_bh(&txq->axq_lock);
+
+ /* complete this sub-frame */
+ ath_tx_complete_buf(sc, bf, &bf_head, !txfail, sendbar);
+ } else {
+ /*
+ * retry the un-acked ones
+ */
+ /*
+ * XXX: if the last descriptor is holding descriptor,
+ * in order to requeue the frame to software queue, we
+ * need to allocate a new descriptor and
+ * copy the content of holding descriptor to it.
+ */
+ if (bf->bf_next == NULL &&
+ bf_last->bf_status & ATH_BUFSTATUS_STALE) {
+ struct ath_buf *tbf;
+
+ /* allocate new descriptor */
+ spin_lock_bh(&sc->sc_txbuflock);
+ ASSERT(!list_empty((&sc->sc_txbuf)));
+ tbf = list_first_entry(&sc->sc_txbuf,
+ struct ath_buf, list);
+ list_del(&tbf->list);
+ spin_unlock_bh(&sc->sc_txbuflock);
+
+ ATH_TXBUF_RESET(tbf);
+
+ /* copy descriptor content */
+ tbf->bf_mpdu = bf_last->bf_mpdu;
+ tbf->bf_node = bf_last->bf_node;
+ tbf->bf_buf_addr = bf_last->bf_buf_addr;
+ *(tbf->bf_desc) = *(bf_last->bf_desc);
+
+ /* link it to the frame */
+ if (bf_lastq) {
+ bf_lastq->bf_desc->ds_link =
+ tbf->bf_daddr;
+ bf->bf_lastfrm = tbf;
+ ath9k_hw_cleartxdesc(sc->sc_ah,
+ bf->bf_lastfrm->bf_desc);
+ } else {
+ tbf->bf_state = bf_last->bf_state;
+ tbf->bf_lastfrm = tbf;
+ ath9k_hw_cleartxdesc(sc->sc_ah,
+ tbf->bf_lastfrm->bf_desc);
+
+ /* copy the DMA context */
+ copy_dma_mem_context(
+ get_dma_mem_context(tbf,
+ bf_dmacontext),
+ get_dma_mem_context(bf_last,
+ bf_dmacontext));
+ }
+ list_add_tail(&tbf->list, &bf_head);
+ } else {
+ /*
+ * Clear descriptor status words for
+ * software retry
+ */
+ ath9k_hw_cleartxdesc(sc->sc_ah,
+ bf->bf_lastfrm->bf_desc);
+ }
+
+ /*
+ * Put this buffer to the temporary pending
+ * queue to retain ordering
+ */
+ list_splice_tail_init(&bf_head, &bf_pending);
+ }
+
+ bf = bf_next;
+ }
+
+ /*
+ * node is already gone. no more assocication
+ * with the node. the node might have been freed
+ * any node acces can result in panic.note tid
+ * is part of the node.
+ */
+ if (isnodegone)
+ return;
+
+ if (tid->cleanup_inprogress) {
+ /* check to see if we're done with cleaning the h/w queue */
+ spin_lock_bh(&txq->axq_lock);
+
+ if (tid->baw_head == tid->baw_tail) {
+ tid->addba_exchangecomplete = 0;
+ tid->addba_exchangeattempts = 0;
+ spin_unlock_bh(&txq->axq_lock);
+
+ tid->cleanup_inprogress = false;
+
+ /* send buffered frames as singles */
+ ath_tx_flush_tid(sc, tid);
+ } else
+ spin_unlock_bh(&txq->axq_lock);
+
+ return;
+ }
+
+ /*
+ * prepend un-acked frames to the beginning of the pending frame queue
+ */
+ if (!list_empty(&bf_pending)) {
+ spin_lock_bh(&txq->axq_lock);
+ /* Note: we _prepend_, we _do_not_ at to
+ * the end of the queue ! */
+ list_splice(&bf_pending, &tid->buf_q);
+ ath_tx_queue_tid(txq, tid);
+ spin_unlock_bh(&txq->axq_lock);
+ }
+
+ if (needreset)
+ ath_internal_reset(sc);
+
+ return;
+}
+
+/* Process completed xmit descriptors from the specified queue */
+
+static int ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_buf *bf, *lastbf, *bf_held = NULL;
+ struct list_head bf_head;
+ struct ath_desc *ds, *tmp_ds;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_tx_info_priv *tx_info_priv;
+ int nacked, txok, nbad = 0, isrifs = 0;
+ int status;
+
+ DPRINTF(sc, ATH_DBG_QUEUE,
+ "%s: tx queue %d (%x), link %p\n", __func__,
+ txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
+ txq->axq_link);
+
+ nacked = 0;
+ for (;;) {
+ spin_lock_bh(&txq->axq_lock);
+ txq->axq_intrcnt = 0; /* reset periodic desc intr count */
+ if (list_empty(&txq->axq_q)) {
+ txq->axq_link = NULL;
+ txq->axq_linkbuf = NULL;
+ spin_unlock_bh(&txq->axq_lock);
+ 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_status & ATH_BUFSTATUS_STALE) {
+ bf_held = bf;
+ if (list_is_last(&bf_held->list, &txq->axq_q)) {
+ /* FIXME:
+ * The holding descriptor is the last
+ * descriptor in queue. It's safe to remove
+ * the last holding descriptor in BH context.
+ */
+ spin_unlock_bh(&txq->axq_lock);
+ break;
+ } else {
+ /* Lets work with the next buffer now */
+ bf = list_entry(bf_held->list.next,
+ struct ath_buf, list);
+ }
+ }
+
+ lastbf = bf->bf_lastbf;
+ ds = lastbf->bf_desc; /* NB: last decriptor */
+
+ status = ath9k_hw_txprocdesc(ah, ds);
+ if (status == -EINPROGRESS) {
+ spin_unlock_bh(&txq->axq_lock);
+ break;
+ }
+ if (bf->bf_desc == txq->axq_lastdsWithCTS)
+ txq->axq_lastdsWithCTS = NULL;
+ if (ds == txq->axq_gatingds)
+ txq->axq_gatingds = NULL;
+
+ /*
+ * 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_status |= ATH_BUFSTATUS_STALE;
+ INIT_LIST_HEAD(&bf_head);
+
+ if (!list_is_singular(&lastbf->list))
+ list_cut_position(&bf_head,
+ &txq->axq_q, lastbf->list.prev);
+
+ txq->axq_depth--;
+
+ if (bf->bf_isaggr)
+ txq->axq_aggr_depth--;
+
+ txok = (ds->ds_txstat.ts_status == 0);
+
+ spin_unlock_bh(&txq->axq_lock);
+
+ if (bf_held) {
+ list_del(&bf_held->list);
+ spin_lock_bh(&sc->sc_txbuflock);
+ list_add_tail(&bf_held->list, &sc->sc_txbuf);
+ spin_unlock_bh(&sc->sc_txbuflock);
+ }
+
+ if (!bf->bf_isampdu) {
+ /*
+ * This frame is sent out as a single frame.
+ * Use hardware retry status for this frame.
+ */
+ bf->bf_retries = ds->ds_txstat.ts_longretry;
+ if (ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY)
+ bf->bf_isxretried = 1;
+ nbad = 0;
+ } else {
+ nbad = ath_tx_num_badfrms(sc, bf, txok);
+ }
+ skb = bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info_priv = (struct ath_tx_info_priv *)
+ tx_info->driver_data[0];
+ if (ds->ds_txstat.ts_status & ATH9K_TXERR_FILT)
+ tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
+ if ((ds->ds_txstat.ts_status & ATH9K_TXERR_FILT) == 0 &&
+ (bf->bf_flags & ATH9K_TXDESC_NOACK) == 0) {
+ if (ds->ds_txstat.ts_status == 0)
+ nacked++;
+
+ if (bf->bf_isdata) {
+ if (isrifs)
+ tmp_ds = bf->bf_rifslast->bf_desc;
+ else
+ tmp_ds = ds;
+ memcpy(&tx_info_priv->tx,
+ &tmp_ds->ds_txstat,
+ sizeof(tx_info_priv->tx));
+ tx_info_priv->n_frames = bf->bf_nframes;
+ tx_info_priv->n_bad_frames = nbad;
+ }
+ }
+
+ /*
+ * Complete this transmit unit
+ */
+ if (bf->bf_isampdu)
+ ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, txok);
+ else
+ ath_tx_complete_buf(sc, bf, &bf_head, txok, 0);
+
+ /* Wake up mac80211 queue */
+
+ spin_lock_bh(&txq->axq_lock);
+ if (txq->stopped && ath_txq_depth(sc, txq->axq_qnum) <=
+ (ATH_TXBUF - 20)) {
+ int qnum;
+ qnum = ath_get_mac80211_qnum(txq->axq_qnum, sc);
+ if (qnum != -1) {
+ ieee80211_wake_queue(sc->hw, qnum);
+ txq->stopped = 0;
+ }
+
+ }
+
+ /*
+ * schedule any pending packets if aggregation is enabled
+ */
+ if (sc->sc_txaggr)
+ ath_txq_schedule(sc, txq);
+ spin_unlock_bh(&txq->axq_lock);
+ }
+ return nacked;
+}
+
+static void ath_tx_stopdma(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct ath_hal *ah = sc->sc_ah;
+
+ (void) ath9k_hw_stoptxdma(ah, txq->axq_qnum);
+ DPRINTF(sc, ATH_DBG_XMIT, "%s: tx queue [%u] %x, link %p\n",
+ __func__, txq->axq_qnum,
+ ath9k_hw_gettxbuf(ah, txq->axq_qnum), txq->axq_link);
+}
+
+/* Drain only the data queues */
+
+static void ath_drain_txdataq(struct ath_softc *sc, bool retry_tx)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ int i;
+ int npend = 0;
+ enum ath9k_ht_macmode ht_macmode = ath_cwm_macmode(sc);
+
+ /* XXX return value */
+ if (!sc->sc_invalid) {
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i)) {
+ ath_tx_stopdma(sc, &sc->sc_txq[i]);
+
+ /* The TxDMA may not really be stopped.
+ * Double check the hal tx pending count */
+ npend += ath9k_hw_numtxpending(ah,
+ sc->sc_txq[i].axq_qnum);
+ }
+ }
+ }
+
+ if (npend) {
+ int status;
+
+ /* TxDMA not stopped, reset the hal */
+ DPRINTF(sc, ATH_DBG_XMIT,
+ "%s: Unable to stop TxDMA. Reset HAL!\n", __func__);
+
+ spin_lock_bh(&sc->sc_resetlock);
+ if (!ath9k_hw_reset(ah, sc->sc_opmode,
+ &sc->sc_curchan, ht_macmode,
+ sc->sc_tx_chainmask, sc->sc_rx_chainmask,
+ sc->sc_ht_extprotspacing, true, &status)) {
+
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: unable to reset hardware; hal status %u\n",
+ __func__,
+ status);
+ }
+ spin_unlock_bh(&sc->sc_resetlock);
+ }
+
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i))
+ ath_tx_draintxq(sc, &sc->sc_txq[i], retry_tx);
+ }
+}
+
+/* Add a sub-frame to block ack window */
+
+static void ath_tx_addto_baw(struct ath_softc *sc,
+ struct ath_atx_tid *tid,
+ struct ath_buf *bf)
+{
+ int index, cindex;
+
+ if (bf->bf_isretried)
+ return;
+
+ index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno);
+ cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);
+
+ ASSERT(tid->tx_buf[cindex] == NULL);
+ tid->tx_buf[cindex] = bf;
+
+ 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);
+ }
+}
+
+/*
+ * Function to send an A-MPDU
+ * NB: must be called with txq lock held
+ */
+
+static int ath_tx_send_ampdu(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct list_head *bf_head,
+ struct ath_tx_control *txctl)
+{
+ struct ath_buf *bf;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_tx_info_priv *tx_info_priv;
+
+ BUG_ON(list_empty(bf_head));
+
+ bf = list_first_entry(bf_head, struct ath_buf, list);
+ bf->bf_isampdu = 1;
+ bf->bf_seqno = txctl->seqno; /* save seqno and tidno in buffer */
+ bf->bf_tidno = txctl->tidno;
+
+ /*
+ * Do not queue to h/w when any of the following conditions is true:
+ * - there are pending frames in software queue
+ * - the TID is currently paused for ADDBA/BAR request
+ * - seqno is not within block-ack window
+ * - h/w queue depth exceeds low water mark
+ */
+ if (!list_empty(&tid->buf_q) || tid->paused ||
+ !BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno) ||
+ txq->axq_depth >= ATH_AGGR_MIN_QDEPTH) {
+ /*
+ * Add this frame to software queue for scheduling later
+ * for aggregation.
+ */
+ list_splice_tail_init(bf_head, &tid->buf_q);
+ ath_tx_queue_tid(txq, tid);
+ return 0;
+ }
+
+ skb = (struct sk_buff *)bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
+ memcpy(bf->bf_rcs, tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0]));
+
+ /* Add sub-frame to BAW */
+ ath_tx_addto_baw(sc, tid, bf);
+
+ /* Queue to h/w without aggregation */
+ bf->bf_nframes = 1;
+ bf->bf_lastbf = bf->bf_lastfrm; /* one single frame */
+ ath_buf_set_rate(sc, bf);
+ ath_tx_txqaddbuf(sc, txq, bf_head);
+ return 0;
+}
+
+/*
+ * looks up the rate
+ * returns aggr limit based on lowest of the rates
+ */
+
+static u32 ath_lookup_rate(struct ath_softc *sc,
+ struct ath_buf *bf)
+{
+ const struct ath9k_rate_table *rt = sc->sc_currates;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ath_tx_info_priv *tx_info_priv;
+ u32 max_4ms_framelen, frame_length;
+ u16 aggr_limit, legacy = 0, maxampdu;
+ int i;
+
+
+ skb = (struct sk_buff *)bf->bf_mpdu;
+ tx_info = IEEE80211_SKB_CB(skb);
+ tx_info_priv = (struct ath_tx_info_priv *)
+ tx_info->driver_data[0];
+ memcpy(bf->bf_rcs,
+ tx_info_priv->rcs, 4 * sizeof(tx_info_priv->rcs[0]));
+
+ /*
+ * Find the lowest frame length among the rate series that will have a
+ * 4ms transmit duration.
+ * TODO - TXOP limit needs to be considered.
+ */
+ max_4ms_framelen = ATH_AMPDU_LIMIT_MAX;
+
+ for (i = 0; i < 4; i++) {
+ if (bf->bf_rcs[i].tries) {
+ frame_length = bf->bf_rcs[i].max_4ms_framelen;
+
+ if (rt->info[bf->bf_rcs[i].rix].phy != PHY_HT) {
+ legacy = 1;
+ break;
+ }
+
+ max_4ms_framelen = min(max_4ms_framelen, frame_length);
+ }
+ }
+
+ /*
+ * 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_DEFAULT);
+
+ /*
+ * h/w can accept aggregates upto 16 bit lengths (65535).
+ * The IE, however can hold upto 65536, which shows up here
+ * as zero. Ignore 65536 since we are constrained by hw.
+ */
+ maxampdu = sc->sc_ht_info.maxampdu;
+ if (maxampdu)
+ aggr_limit = min(aggr_limit, maxampdu);
+
+ return aggr_limit;
+}
+
+/*
+ * returns the number of delimiters to be added to
+ * meet the minimum required mpdudensity.
+ * caller should make sure that the rate is HT rate .
+ */
+
+static int ath_compute_num_delims(struct ath_softc *sc,
+ struct ath_buf *bf,
+ u16 frmlen)
+{
+ const struct ath9k_rate_table *rt = sc->sc_currates;
+ u32 nsymbits, nsymbols, mpdudensity;
+ u16 minlen;
+ u8 rc, flags, rix;
+ int width, half_gi, ndelim, mindelim;
+
+ /* 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 (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR)
+ ndelim += ATH_AGGR_ENCRYPTDELIM;
+
+ /*
+ * 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.
+ */
+ mpdudensity = sc->sc_ht_info.mpdudensity;
+
+ /*
+ * If there is no mpdu density restriction, no further calculation
+ * is needed.
+ */
+ if (mpdudensity == 0)
+ return ndelim;
+
+ rix = bf->bf_rcs[0].rix;
+ flags = bf->bf_rcs[0].flags;
+ rc = rt->info[rix].rateCode;
+ width = (flags & ATH_RC_CW40_FLAG) ? 1 : 0;
+ half_gi = (flags & ATH_RC_SGI_FLAG) ? 1 : 0;
+
+ if (half_gi)
+ nsymbols = NUM_SYMBOLS_PER_USEC_HALFGI(mpdudensity);
+ else
+ nsymbols = NUM_SYMBOLS_PER_USEC(mpdudensity);
+
+ if (nsymbols == 0)
+ nsymbols = 1;
+
+ nsymbits = bits_per_symbol[HT_RC_2_MCS(rc)][width];
+ minlen = (nsymbols * nsymbits) / BITS_PER_BYTE;
+
+ /* Is frame shorter than required minimum length? */
+ if (frmlen < minlen) {
+ /* Get the minimum number of delimiters required. */
+ mindelim = (minlen - frmlen) / ATH_AGGR_DELIM_SZ;
+ ndelim = max(mindelim, ndelim);
+ }
+
+ return ndelim;
+}
+
+/*
+ * For aggregation from software buffer queue.
+ * NB: must be called with txq lock held
+ */
+
+static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
+ struct ath_atx_tid *tid,
+ struct list_head *bf_q,
+ struct ath_buf **bf_last,
+ struct aggr_rifs_param *param,
+ int *prev_frames)
+{
+#define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
+ struct ath_buf *bf, *tbf, *bf_first, *bf_prev = NULL;
+ struct list_head bf_head;
+ int rl = 0, nframes = 0, ndelim;
+ u16 aggr_limit = 0, al = 0, bpad = 0,
+ al_delta, h_baw = tid->baw_size / 2;
+ enum ATH_AGGR_STATUS status = ATH_AGGR_DONE;
+ int prev_al = 0, is_ds_rate = 0;
+ INIT_LIST_HEAD(&bf_head);
+
+ BUG_ON(list_empty(&tid->buf_q));
+
+ bf_first = list_first_entry(&tid->buf_q, struct ath_buf, list);
+
+ do {
+ bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+
+ /*
+ * do not step over block-ack window
+ */
+ if (!BAW_WITHIN(tid->seq_start, tid->baw_size, bf->bf_seqno)) {
+ status = ATH_AGGR_BAW_CLOSED;
+ break;
+ }
+
+ if (!rl) {
+ aggr_limit = ath_lookup_rate(sc, bf);
+ rl = 1;
+ /*
+ * Is rate dual stream
+ */
+ is_ds_rate =
+ (bf->bf_rcs[0].flags & ATH_RC_DS_FLAG) ? 1 : 0;
+ }
+
+ /*
+ * do not exceed aggregation limit
+ */
+ al_delta = ATH_AGGR_DELIM_SZ + bf->bf_frmlen;
+
+ if (nframes && (aggr_limit <
+ (al + bpad + al_delta + prev_al))) {
+ status = ATH_AGGR_LIMITED;
+ break;
+ }
+
+ /*
+ * do not exceed subframe limit
+ */
+ if ((nframes + *prev_frames) >=
+ min((int)h_baw, ATH_AMPDU_SUBFRAME_DEFAULT)) {
+ status = ATH_AGGR_LIMITED;
+ 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, bf_first, bf->bf_frmlen);
+
+ bpad = PADBYTES(al_delta) + (ndelim << 2);
+
+ bf->bf_next = NULL;
+ bf->bf_lastfrm->bf_desc->ds_link = 0;
+
+ /*
+ * this packet is part of an aggregate
+ * - remove all descriptors belonging to this frame from
+ * software queue
+ * - add it to block ack window
+ * - set up descriptors for aggregation
+ */
+ list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
+ ath_tx_addto_baw(sc, tid, bf);
+
+ list_for_each_entry(tbf, &bf_head, list) {
+ ath9k_hw_set11n_aggr_middle(sc->sc_ah,
+ tbf->bf_desc, ndelim);
+ }
+
+ /*
+ * link buffers of this frame to the aggregate
+ */
+ list_splice_tail_init(&bf_head, bf_q);
+ nframes++;
+
+ if (bf_prev) {
+ bf_prev->bf_next = bf;
+ bf_prev->bf_lastfrm->bf_desc->ds_link = bf->bf_daddr;
+ }
+ bf_prev = bf;
+
+#ifdef AGGR_NOSHORT
+ /*
+ * terminate aggregation on a small packet boundary
+ */
+ if (bf->bf_frmlen < ATH_AGGR_MINPLEN) {
+ status = ATH_AGGR_SHORTPKT;
+ break;
+ }
+#endif
+ } while (!list_empty(&tid->buf_q));
+
+ bf_first->bf_al = al;
+ bf_first->bf_nframes = nframes;
+ *bf_last = bf_prev;
+ return status;
+#undef PADBYTES
+}
+
+/*
+ * process pending frames possibly doing a-mpdu aggregation
+ * NB: must be called with txq lock held
+ */
+
+static void ath_tx_sched_aggr(struct ath_softc *sc,
+ struct ath_txq *txq, struct ath_atx_tid *tid)
+{
+ struct ath_buf *bf, *tbf, *bf_last, *bf_lastaggr = NULL;
+ enum ATH_AGGR_STATUS status;
+ struct list_head bf_q;
+ struct aggr_rifs_param param = {0, 0, 0, 0, NULL};
+ int prev_frames = 0;
+
+ do {
+ if (list_empty(&tid->buf_q))
+ return;
+
+ INIT_LIST_HEAD(&bf_q);
+
+ status = ath_tx_form_aggr(sc, tid, &bf_q, &bf_lastaggr, ¶m,
+ &prev_frames);
+
+ /*
+ * no frames picked up to be aggregated; block-ack
+ * window is not open
+ */
+ if (list_empty(&bf_q))
+ break;
+
+ bf = list_first_entry(&bf_q, struct ath_buf, list);
+ bf_last = list_entry(bf_q.prev, struct ath_buf, list);
+ bf->bf_lastbf = bf_last;
+
+ /*
+ * if only one frame, send as non-aggregate
+ */
+ if (bf->bf_nframes == 1) {
+ ASSERT(bf->bf_lastfrm == bf_last);
+
+ bf->bf_isaggr = 0;
+ /*
+ * clear aggr bits for every descriptor
+ * XXX TODO: is there a way to optimize it?
+ */
+ list_for_each_entry(tbf, &bf_q, list) {
+ ath9k_hw_clr11n_aggr(sc->sc_ah, tbf->bf_desc);
+ }
+
+ ath_buf_set_rate(sc, bf);
+ ath_tx_txqaddbuf(sc, txq, &bf_q);
+ continue;
+ }
+
+ /*
+ * setup first desc with rate and aggr info
+ */
+ bf->bf_isaggr = 1;
+ ath_buf_set_rate(sc, bf);
+ ath9k_hw_set11n_aggr_first(sc->sc_ah, bf->bf_desc, bf->bf_al);
+
+ /*
+ * anchor last frame of aggregate correctly
+ */
+ ASSERT(bf_lastaggr);
+ ASSERT(bf_lastaggr->bf_lastfrm == bf_last);
+ tbf = bf_lastaggr;
+ ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc);
+
+ /* XXX: We don't enter into this loop, consider removing this */
+ while (!list_empty(&bf_q) && !list_is_last(&tbf->list, &bf_q)) {
+ tbf = list_entry(tbf->list.next, struct ath_buf, list);
+ ath9k_hw_set11n_aggr_last(sc->sc_ah, tbf->bf_desc);
+ }
+
+ txq->axq_aggr_depth++;
+
+ /*
+ * Normal aggregate, queue to hardware
+ */
+ ath_tx_txqaddbuf(sc, txq, &bf_q);
+
+ } while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
+ status != ATH_AGGR_BAW_CLOSED);
+}
+
+/* Called with txq lock held */
+
+static void ath_tid_drain(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ bool bh_flag)
+{
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ INIT_LIST_HEAD(&bf_head);
+
+ for (;;) {
+ if (list_empty(&tid->buf_q))
+ break;
+ bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+
+ list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
+
+ /* update baw for software retried frame */
+ if (bf->bf_isretried)
+ ath_tx_update_baw(sc, tid, bf->bf_seqno);
+
+ /*
+ * do not indicate packets while holding txq spinlock.
+ * unlock is intentional here
+ */
+ if (likely(bh_flag))
+ spin_unlock_bh(&txq->axq_lock);
+ else
+ spin_unlock(&txq->axq_lock);
+
+ /* complete this sub-frame */
+ ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+
+ if (likely(bh_flag))
+ spin_lock_bh(&txq->axq_lock);
+ else
+ spin_lock(&txq->axq_lock);
+ }
+
+ /*
+ * TODO: For frame(s) that are in the retry state, we will reuse the
+ * sequence number(s) without setting the retry bit. The
+ * alternative is to give up on these and BAR the receiver's window
+ * forward.
+ */
+ tid->seq_next = tid->seq_start;
+ tid->baw_tail = tid->baw_head;
+}
+
+/*
+ * Drain all pending buffers
+ * NB: must be called with txq lock held
+ */
+
+static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
+ struct ath_txq *txq,
+ bool bh_flag)
+{
+ struct ath_atx_ac *ac, *ac_tmp;
+ struct ath_atx_tid *tid, *tid_tmp;
+
+ list_for_each_entry_safe(ac, ac_tmp, &txq->axq_acq, list) {
+ list_del(&ac->list);
+ ac->sched = false;
+ list_for_each_entry_safe(tid, tid_tmp, &ac->tid_q, list) {
+ list_del(&tid->list);
+ tid->sched = false;
+ ath_tid_drain(sc, txq, tid, bh_flag);
+ }
+ }
+}
+
+static int ath_tx_start_dma(struct ath_softc *sc,
+ struct sk_buff *skb,
+ struct scatterlist *sg,
+ u32 n_sg,
+ struct ath_tx_control *txctl)
+{
+ struct ath_node *an = txctl->an;
+ struct ath_buf *bf = NULL;
+ struct list_head bf_head;
+ struct ath_desc *ds;
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_txq *txq = &sc->sc_txq[txctl->qnum];
+ struct ath_tx_info_priv *tx_info_priv;
+ struct ath_rc_series *rcs;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ __le16 fc = hdr->frame_control;
+
+ /* For each sglist entry, allocate an ath_buf for DMA */
+ INIT_LIST_HEAD(&bf_head);
+ spin_lock_bh(&sc->sc_txbuflock);
+ if (unlikely(list_empty(&sc->sc_txbuf))) {
+ spin_unlock_bh(&sc->sc_txbuflock);
+ return -ENOMEM;
+ }
+
+ bf = list_first_entry(&sc->sc_txbuf, struct ath_buf, list);
+ list_del(&bf->list);
+ spin_unlock_bh(&sc->sc_txbuflock);
+
+ list_add_tail(&bf->list, &bf_head);
+
+ /* set up this buffer */
+ ATH_TXBUF_RESET(bf);
+ bf->bf_frmlen = txctl->frmlen;
+ bf->bf_isdata = ieee80211_is_data(fc);
+ bf->bf_isbar = ieee80211_is_back_req(fc);
+ bf->bf_ispspoll = ieee80211_is_pspoll(fc);
+ bf->bf_flags = txctl->flags;
+ bf->bf_shpreamble = sc->sc_flags & ATH_PREAMBLE_SHORT;
+ bf->bf_keytype = txctl->keytype;
+ tx_info_priv = (struct ath_tx_info_priv *)tx_info->driver_data[0];
+ rcs = tx_info_priv->rcs;
+ bf->bf_rcs[0] = rcs[0];
+ bf->bf_rcs[1] = rcs[1];
+ bf->bf_rcs[2] = rcs[2];
+ bf->bf_rcs[3] = rcs[3];
+ bf->bf_node = an;
+ bf->bf_mpdu = skb;
+ bf->bf_buf_addr = sg_dma_address(sg);
+
+ /* setup descriptor */
+ ds = bf->bf_desc;
+ ds->ds_link = 0;
+ ds->ds_data = bf->bf_buf_addr;
+
+ /*
+ * Save the DMA context in the first ath_buf
+ */
+ copy_dma_mem_context(get_dma_mem_context(bf, bf_dmacontext),
+ get_dma_mem_context(txctl, dmacontext));
+
+ /*
+ * Formulate first tx descriptor with tx controls.
+ */
+ ath9k_hw_set11n_txdesc(ah,
+ ds,
+ bf->bf_frmlen, /* frame length */
+ txctl->atype, /* Atheros packet type */
+ min(txctl->txpower, (u16)60), /* txpower */
+ txctl->keyix, /* key cache index */
+ txctl->keytype, /* key type */
+ txctl->flags); /* flags */
+ ath9k_hw_filltxdesc(ah,
+ ds,
+ sg_dma_len(sg), /* segment length */
+ true, /* first segment */
+ (n_sg == 1) ? true : false, /* last segment */
+ ds); /* first descriptor */
+
+ bf->bf_lastfrm = bf;
+ bf->bf_ht = txctl->ht;
+
+ spin_lock_bh(&txq->axq_lock);
+
+ if (txctl->ht && sc->sc_txaggr) {
+ struct ath_atx_tid *tid = ATH_AN_2_TID(an, txctl->tidno);
+ if (ath_aggr_query(sc, an, txctl->tidno)) {
+ /*
+ * Try aggregation if it's a unicast data frame
+ * and the destination is HT capable.
+ */
+ ath_tx_send_ampdu(sc, txq, tid, &bf_head, txctl);
+ } else {
+ /*
+ * Send this frame as regular when ADDBA exchange
+ * is neither complete nor pending.
+ */
+ ath_tx_send_normal(sc, txq, tid, &bf_head);
+ }
+ } else {
+ bf->bf_lastbf = bf;
+ bf->bf_nframes = 1;
+ ath_buf_set_rate(sc, bf);
+
+ if (ieee80211_is_back_req(fc)) {
+ /* This is required for resuming tid
+ * during BAR completion */
+ bf->bf_tidno = txctl->tidno;
+ }
+
+ if (is_multicast_ether_addr(hdr->addr1)) {
+ struct ath_vap *avp = sc->sc_vaps[txctl->if_id];
+
+ /*
+ * When servicing one or more stations in power-save
+ * mode (or) if there is some mcast data waiting on
+ * mcast queue (to prevent out of order delivery of
+ * mcast,bcast packets) multicast frames must be
+ * buffered until after the beacon. We use the private
+ * mcast queue for that.
+ */
+ /* XXX? more bit in 802.11 frame header */
+ spin_lock_bh(&avp->av_mcastq.axq_lock);
+ if (txctl->ps || avp->av_mcastq.axq_depth)
+ ath_tx_mcastqaddbuf(sc,
+ &avp->av_mcastq, &bf_head);
+ else
+ ath_tx_txqaddbuf(sc, txq, &bf_head);
+ spin_unlock_bh(&avp->av_mcastq.axq_lock);
+ } else
+ ath_tx_txqaddbuf(sc, txq, &bf_head);
+ }
+ spin_unlock_bh(&txq->axq_lock);
+ return 0;
+}
+
+static void xmit_map_sg(struct ath_softc *sc,
+ struct sk_buff *skb,
+ dma_addr_t *pa,
+ struct ath_tx_control *txctl)
+{
+ struct ath_xmit_status tx_status;
+ struct ath_atx_tid *tid;
+ struct scatterlist sg;
+
+ *pa = pci_map_single(sc->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
+
+ /* setup S/G list */
+ memset(&sg, 0, sizeof(struct scatterlist));
+ sg_dma_address(&sg) = *pa;
+ sg_dma_len(&sg) = skb->len;
+
+ if (ath_tx_start_dma(sc, skb, &sg, 1, txctl) != 0) {
+ /*
+ * We have to do drop frame here.
+ */
+ pci_unmap_single(sc->pdev, *pa, skb->len, PCI_DMA_TODEVICE);
+
+ tx_status.retries = 0;
+ tx_status.flags = ATH_TX_ERROR;
+
+ if (txctl->ht && sc->sc_txaggr) {
+ /* Reclaim the seqno. */
+ tid = ATH_AN_2_TID((struct ath_node *)
+ txctl->an, txctl->tidno);
+ DECR(tid->seq_next, IEEE80211_SEQ_MAX);
+ }
+ ath_tx_complete(sc, skb, &tx_status, txctl->an);
+ }
+}
+
+/* Initialize TX queue and h/w */
+
+int ath_tx_init(struct ath_softc *sc, int nbufs)
+{
+ int error = 0;
+
+ do {
+ spin_lock_init(&sc->sc_txbuflock);
+
+ /* Setup tx descriptors */
+ error = ath_descdma_setup(sc, &sc->sc_txdma, &sc->sc_txbuf,
+ "tx", nbufs * ATH_FRAG_PER_MSDU, ATH_TXDESC);
+ if (error != 0) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: failed to allocate tx descriptors: %d\n",
+ __func__, error);
+ break;
+ }
+
+ /* XXX allocate beacon state together with vap */
+ error = ath_descdma_setup(sc, &sc->sc_bdma, &sc->sc_bbuf,
+ "beacon", ATH_BCBUF, 1);
+ if (error != 0) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: failed to allocate "
+ "beacon descripotrs: %d\n",
+ __func__, error);
+ break;
+ }
+
+ } while (0);
+
+ if (error != 0)
+ ath_tx_cleanup(sc);
+
+ return error;
+}
+
+/* Reclaim all tx queue resources */
+
+int ath_tx_cleanup(struct ath_softc *sc)
+{
+ /* cleanup beacon descriptors */
+ if (sc->sc_bdma.dd_desc_len != 0)
+ ath_descdma_cleanup(sc, &sc->sc_bdma, &sc->sc_bbuf);
+
+ /* cleanup tx descriptors */
+ if (sc->sc_txdma.dd_desc_len != 0)
+ ath_descdma_cleanup(sc, &sc->sc_txdma, &sc->sc_txbuf);
+
+ return 0;
+}
+
+/* Setup a h/w transmit queue */
+
+struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath9k_txq_info qi;
+ int qnum;
+
+ memzero(&qi, sizeof(qi));
+ qi.tqi_subtype = subtype;
+ qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
+ qi.tqi_compBuf = 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 (qtype == ATH9K_TX_QUEUE_UAPSD)
+ qi.tqi_qflags = TXQ_FLAG_TXDESCINT_ENABLE;
+ else
+ qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE |
+ TXQ_FLAG_TXDESCINT_ENABLE;
+ qnum = ath9k_hw_setuptxqueue(ah, qtype, &qi);
+ if (qnum == -1) {
+ /*
+ * NB: don't print a message, this happens
+ * normally on parts with too few tx queues
+ */
+ return NULL;
+ }
+ if (qnum >= ARRAY_SIZE(sc->sc_txq)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: hal qnum %u out of range, max %u!\n",
+ __func__, qnum, (unsigned int)ARRAY_SIZE(sc->sc_txq));
+ ath9k_hw_releasetxqueue(ah, qnum);
+ return NULL;
+ }
+ if (!ATH_TXQ_SETUP(sc, qnum)) {
+ struct ath_txq *txq = &sc->sc_txq[qnum];
+
+ txq->axq_qnum = qnum;
+ txq->axq_link = NULL;
+ INIT_LIST_HEAD(&txq->axq_q);
+ INIT_LIST_HEAD(&txq->axq_acq);
+ spin_lock_init(&txq->axq_lock);
+ txq->axq_depth = 0;
+ txq->axq_aggr_depth = 0;
+ txq->axq_totalqueued = 0;
+ txq->axq_intrcnt = 0;
+ txq->axq_linkbuf = NULL;
+ sc->sc_txqsetup |= 1<<qnum;
+ }
+ return &sc->sc_txq[qnum];
+}
+
+/* Reclaim resources for a setup queue */
+
+void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
+{
+ ath9k_hw_releasetxqueue(sc->sc_ah, txq->axq_qnum);
+ sc->sc_txqsetup &= ~(1<<txq->axq_qnum);
+}
+
+/*
+ * Setup a hardware data transmit queue for the specified
+ * access control. The hal may not support all requested
+ * queues in which case it will return a reference to a
+ * previously setup queue. We record the mapping from ac's
+ * to h/w queues for use by ath_tx_start and also track
+ * the set of h/w queues being used to optimize work in the
+ * transmit interrupt handler and related routines.
+ */
+
+int ath_tx_setup(struct ath_softc *sc, int haltype)
+{
+ struct ath_txq *txq;
+
+ if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: HAL AC %u out of range, max %zu!\n",
+ __func__, haltype, ARRAY_SIZE(sc->sc_haltype2q));
+ return 0;
+ }
+ txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype);
+ if (txq != NULL) {
+ sc->sc_haltype2q[haltype] = txq->axq_qnum;
+ return 1;
+ } else
+ return 0;
+}
+
+int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype)
+{
+ int qnum;
+
+ switch (qtype) {
+ case ATH9K_TX_QUEUE_DATA:
+ if (haltype >= ARRAY_SIZE(sc->sc_haltype2q)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: HAL AC %u out of range, max %zu!\n",
+ __func__,
+ haltype, ARRAY_SIZE(sc->sc_haltype2q));
+ return -1;
+ }
+ qnum = sc->sc_haltype2q[haltype];
+ break;
+ case ATH9K_TX_QUEUE_BEACON:
+ qnum = sc->sc_bhalq;
+ break;
+ case ATH9K_TX_QUEUE_CAB:
+ qnum = sc->sc_cabq->axq_qnum;
+ break;
+ default:
+ qnum = -1;
+ }
+ return qnum;
+}
+
+/* Update parameters for a transmit queue */
+
+int ath_txq_update(struct ath_softc *sc, int qnum, struct ath9k_txq_info *qi0)
+{
+ struct ath_hal *ah = sc->sc_ah;
+ int error = 0;
+ struct ath9k_txq_info qi;
+
+ if (qnum == sc->sc_bhalq) {
+ /*
+ * XXX: for beacon queue, we just save the parameter.
+ * It will be picked up by ath_beaconq_config when
+ * it's necessary.
+ */
+ sc->sc_beacon_qi = *qi0;
+ return 0;
+ }
+
+ ASSERT(sc->sc_txq[qnum].axq_qnum == qnum);
+
+ ath9k_hw_gettxqueueprops(ah, qnum, &qi);
+ qi.tqi_aifs = qi0->tqi_aifs;
+ qi.tqi_cwmin = qi0->tqi_cwmin;
+ qi.tqi_cwmax = qi0->tqi_cwmax;
+ qi.tqi_burstTime = qi0->tqi_burstTime;
+ qi.tqi_readyTime = qi0->tqi_readyTime;
+
+ if (!ath9k_hw_settxqueueprops(ah, qnum, &qi)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "%s: unable to update hardware queue %u!\n",
+ __func__, qnum);
+ error = -EIO;
+ } else {
+ ath9k_hw_resettxqueue(ah, qnum); /* push to h/w */
+ }
+
+ return error;
+}
+
+int ath_cabq_update(struct ath_softc *sc)
+{
+ struct ath9k_txq_info qi;
+ int qnum = sc->sc_cabq->axq_qnum;
+ struct ath_beacon_config conf;
+
+ ath9k_hw_gettxqueueprops(sc->sc_ah, qnum, &qi);
+ /*
+ * Ensure the readytime % is within the bounds.
+ */
+ if (sc->sc_config.cabqReadytime < ATH9K_READY_TIME_LO_BOUND)
+ sc->sc_config.cabqReadytime = ATH9K_READY_TIME_LO_BOUND;
+ else if (sc->sc_config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND)
+ sc->sc_config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND;
+
+ ath_get_beaconconfig(sc, ATH_IF_ID_ANY, &conf);
+ qi.tqi_readyTime =
+ (conf.beacon_interval * sc->sc_config.cabqReadytime) / 100;
+ ath_txq_update(sc, qnum, &qi);
+
+ return 0;
+}
+
+int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb)
+{
+ struct ath_tx_control txctl;
+ int error = 0;
+
+ error = ath_tx_prepare(sc, skb, &txctl);
+ if (error == 0)
+ /*
+ * Start DMA mapping.
+ * ath_tx_start_dma() will be called either synchronously
+ * or asynchrounsly once DMA is complete.
+ */
+ xmit_map_sg(sc, skb,
+ get_dma_mem_context(&txctl, dmacontext),
+ &txctl);
+ else
+ ath_node_put(sc, txctl.an, ATH9K_BH_STATUS_CHANGE);
+
+ /* failed packets will be dropped by the caller */
+ return error;
+}
+
+/* Deferred processing of transmit interrupt */
+
+void ath_tx_tasklet(struct ath_softc *sc)
+{
+ u64 tsf = ath9k_hw_gettsf64(sc->sc_ah);
+ int i, nacked = 0;
+ u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1);
+
+ ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask);
+
+ /*
+ * Process each active queue.
+ */
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i) && (qcumask & (1 << i)))
+ nacked += ath_tx_processq(sc, &sc->sc_txq[i]);
+ }
+ if (nacked)
+ sc->sc_lastrx = tsf;
+}
+
+void ath_tx_draintxq(struct ath_softc *sc,
+ struct ath_txq *txq, bool retry_tx)
+{
+ struct ath_buf *bf, *lastbf;
+ struct list_head bf_head;
+
+ INIT_LIST_HEAD(&bf_head);
+
+ /*
+ * NB: this assumes output has been stopped and
+ * we do not need to block ath_tx_tasklet
+ */
+ for (;;) {
+ spin_lock_bh(&txq->axq_lock);
+
+ if (list_empty(&txq->axq_q)) {
+ txq->axq_link = NULL;
+ txq->axq_linkbuf = NULL;
+ spin_unlock_bh(&txq->axq_lock);
+ break;
+ }
+
+ bf = list_first_entry(&txq->axq_q, struct ath_buf, list);
+
+ if (bf->bf_status & ATH_BUFSTATUS_STALE) {
+ list_del(&bf->list);
+ spin_unlock_bh(&txq->axq_lock);
+
+ spin_lock_bh(&sc->sc_txbuflock);
+ list_add_tail(&bf->list, &sc->sc_txbuf);
+ spin_unlock_bh(&sc->sc_txbuflock);
+ continue;
+ }
+
+ lastbf = bf->bf_lastbf;
+ if (!retry_tx)
+ lastbf->bf_desc->ds_txstat.ts_flags =
+ ATH9K_TX_SW_ABORTED;
+
+ /* remove ath_buf's of the same mpdu from txq */
+ list_cut_position(&bf_head, &txq->axq_q, &lastbf->list);
+ txq->axq_depth--;
+
+ spin_unlock_bh(&txq->axq_lock);
+
+ if (bf->bf_isampdu)
+ ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, 0);
+ else
+ ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+ }
+
+ /* flush any pending frames if aggregation is enabled */
+ if (sc->sc_txaggr) {
+ if (!retry_tx) {
+ spin_lock_bh(&txq->axq_lock);
+ ath_txq_drain_pending_buffers(sc, txq,
+ ATH9K_BH_STATUS_CHANGE);
+ spin_unlock_bh(&txq->axq_lock);
+ }
+ }
+}
+
+/* Drain the transmit queues and reclaim resources */
+
+void ath_draintxq(struct ath_softc *sc, bool retry_tx)
+{
+ /* stop beacon queue. The beacon will be freed when
+ * we go to INIT state */
+ if (!sc->sc_invalid) {
+ (void) ath9k_hw_stoptxdma(sc->sc_ah, sc->sc_bhalq);
+ DPRINTF(sc, ATH_DBG_XMIT, "%s: beacon queue %x\n", __func__,
+ ath9k_hw_gettxbuf(sc->sc_ah, sc->sc_bhalq));
+ }
+
+ ath_drain_txdataq(sc, retry_tx);
+}
+
+u32 ath_txq_depth(struct ath_softc *sc, int qnum)
+{
+ return sc->sc_txq[qnum].axq_depth;
+}
+
+u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum)
+{
+ return sc->sc_txq[qnum].axq_aggr_depth;
+}
+
+/* Check if an ADDBA is required. A valid node must be passed. */
+enum ATH_AGGR_CHECK ath_tx_aggr_check(struct ath_softc *sc,
+ struct ath_node *an,
+ u8 tidno)
+{
+ struct ath_atx_tid *txtid;
+ DECLARE_MAC_BUF(mac);
+
+ if (!sc->sc_txaggr)
+ return AGGR_NOT_REQUIRED;
+
+ /* ADDBA exchange must be completed before sending aggregates */
+ txtid = ATH_AN_2_TID(an, tidno);
+
+ if (txtid->addba_exchangecomplete)
+ return AGGR_EXCHANGE_DONE;
+
+ if (txtid->cleanup_inprogress)
+ return AGGR_CLEANUP_PROGRESS;
+
+ if (txtid->addba_exchangeinprogress)
+ return AGGR_EXCHANGE_PROGRESS;
+
+ if (!txtid->addba_exchangecomplete) {
+ if (!txtid->addba_exchangeinprogress &&
+ (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) {
+ txtid->addba_exchangeattempts++;
+ return AGGR_REQUIRED;
+ }
+ }
+
+ return AGGR_NOT_REQUIRED;
+}
+
+/* Start TX aggregation */
+
+int ath_tx_aggr_start(struct ath_softc *sc,
+ const u8 *addr,
+ u16 tid,
+ u16 *ssn)
+{
+ struct ath_atx_tid *txtid;
+ struct ath_node *an;
+
+ spin_lock_bh(&sc->node_lock);
+ an = ath_node_find(sc, (u8 *) addr);
+ spin_unlock_bh(&sc->node_lock);
+
+ if (!an) {
+ DPRINTF(sc, ATH_DBG_AGGR,
+ "%s: Node not found to initialize "
+ "TX aggregation\n", __func__);
+ return -1;
+ }
+
+ if (sc->sc_txaggr) {
+ txtid = ATH_AN_2_TID(an, tid);
+ txtid->addba_exchangeinprogress = 1;
+ ath_tx_pause_tid(sc, txtid);
+ }
+
+ return 0;
+}
+
+/* Stop tx aggregation */
+
+int ath_tx_aggr_stop(struct ath_softc *sc,
+ const u8 *addr,
+ u16 tid)
+{
+ struct ath_node *an;
+
+ spin_lock_bh(&sc->node_lock);
+ an = ath_node_find(sc, (u8 *) addr);
+ spin_unlock_bh(&sc->node_lock);
+
+ if (!an) {
+ DPRINTF(sc, ATH_DBG_AGGR,
+ "%s: TX aggr stop for non-existent node\n", __func__);
+ return -1;
+ }
+
+ ath_tx_aggr_teardown(sc, an, tid);
+ return 0;
+}
+
+/*
+ * Performs transmit side cleanup when TID changes from aggregated to
+ * unaggregated.
+ * - Pause the TID and mark cleanup in progress
+ * - Discard all retry frames from the s/w queue.
+ */
+
+void ath_tx_aggr_teardown(struct ath_softc *sc,
+ struct ath_node *an, u8 tid)
+{
+ struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
+ struct ath_txq *txq = &sc->sc_txq[txtid->ac->qnum];
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ INIT_LIST_HEAD(&bf_head);
+
+ DPRINTF(sc, ATH_DBG_AGGR, "%s: teardown TX aggregation\n", __func__);
+
+ if (txtid->cleanup_inprogress) /* cleanup is in progress */
+ return;
+
+ if (!txtid->addba_exchangecomplete) {
+ txtid->addba_exchangeattempts = 0;
+ return;
+ }
+
+ /* TID must be paused first */
+ ath_tx_pause_tid(sc, txtid);
+
+ /* drop all software retried frames and mark this TID */
+ spin_lock_bh(&txq->axq_lock);
+ while (!list_empty(&txtid->buf_q)) {
+ bf = list_first_entry(&txtid->buf_q, struct ath_buf, list);
+ if (!bf->bf_isretried) {
+ /*
+ * NB: it's based on the assumption that
+ * software retried frame will always stay
+ * at the head of software queue.
+ */
+ break;
+ }
+ list_cut_position(&bf_head,
+ &txtid->buf_q, &bf->bf_lastfrm->list);
+ ath_tx_update_baw(sc, txtid, bf->bf_seqno);
+
+ /* complete this sub-frame */
+ ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+ }
+
+ if (txtid->baw_head != txtid->baw_tail) {
+ spin_unlock_bh(&txq->axq_lock);
+ txtid->cleanup_inprogress = true;
+ } else {
+ txtid->addba_exchangecomplete = 0;
+ txtid->addba_exchangeattempts = 0;
+ spin_unlock_bh(&txq->axq_lock);
+ ath_tx_flush_tid(sc, txtid);
+ }
+}
+
+/*
+ * Tx scheduling logic
+ * NB: must be called with txq lock held
+ */
+
+void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct ath_atx_ac *ac;
+ struct ath_atx_tid *tid;
+
+ /* nothing to schedule */
+ if (list_empty(&txq->axq_acq))
+ return;
+ /*
+ * get the first node/ac pair on the queue
+ */
+ ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
+ list_del(&ac->list);
+ ac->sched = false;
+
+ /*
+ * process a single tid per destination
+ */
+ do {
+ /* nothing to schedule */
+ if (list_empty(&ac->tid_q))
+ return;
+
+ tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list);
+ list_del(&tid->list);
+ tid->sched = false;
+
+ if (tid->paused) /* check next tid to keep h/w busy */
+ continue;
+
+ if (!(tid->an->an_smmode == ATH_SM_PWRSAV_DYNAMIC) ||
+ ((txq->axq_depth % 2) == 0)) {
+ ath_tx_sched_aggr(sc, txq, tid);
+ }
+
+ /*
+ * add tid to round-robin queue if more frames
+ * are pending for the tid
+ */
+ if (!list_empty(&tid->buf_q))
+ ath_tx_queue_tid(txq, tid);
+
+ /* only schedule one TID at a time */
+ break;
+ } while (!list_empty(&ac->tid_q));
+
+ /*
+ * schedule AC if more TIDs need processing
+ */
+ if (!list_empty(&ac->tid_q)) {
+ /*
+ * add dest ac to txq if not already added
+ */
+ if (!ac->sched) {
+ ac->sched = true;
+ list_add_tail(&ac->list, &txq->axq_acq);
+ }
+ }
+}
+
+/* Initialize per-node transmit state */
+
+void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
+{
+ if (sc->sc_txaggr) {
+ struct ath_atx_tid *tid;
+ struct ath_atx_ac *ac;
+ int tidno, acno;
+
+ sc->sc_ht_info.maxampdu = ATH_AMPDU_LIMIT_DEFAULT;
+
+ /*
+ * Init per tid tx state
+ */
+ for (tidno = 0, tid = &an->an_aggr.tx.tid[tidno];
+ tidno < WME_NUM_TID;
+ 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->paused = false;
+ tid->cleanup_inprogress = false;
+ INIT_LIST_HEAD(&tid->buf_q);
+
+ acno = TID_TO_WME_AC(tidno);
+ tid->ac = &an->an_aggr.tx.ac[acno];
+
+ /* ADDBA state */
+ tid->addba_exchangecomplete = 0;
+ tid->addba_exchangeinprogress = 0;
+ tid->addba_exchangeattempts = 0;
+ }
+
+ /*
+ * Init per ac tx state
+ */
+ for (acno = 0, ac = &an->an_aggr.tx.ac[acno];
+ acno < WME_NUM_AC; acno++, ac++) {
+ ac->sched = false;
+ INIT_LIST_HEAD(&ac->tid_q);
+
+ switch (acno) {
+ case WME_AC_BE:
+ ac->qnum = ath_tx_get_qnum(sc,
+ ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BE);
+ break;
+ case WME_AC_BK:
+ ac->qnum = ath_tx_get_qnum(sc,
+ ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_BK);
+ break;
+ case WME_AC_VI:
+ ac->qnum = ath_tx_get_qnum(sc,
+ ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VI);
+ break;
+ case WME_AC_VO:
+ ac->qnum = ath_tx_get_qnum(sc,
+ ATH9K_TX_QUEUE_DATA, ATH9K_WME_AC_VO);
+ break;
+ }
+ }
+ }
+}
+
+/* Cleanupthe pending buffers for the node. */
+
+void ath_tx_node_cleanup(struct ath_softc *sc,
+ struct ath_node *an, bool bh_flag)
+{
+ int i;
+ struct ath_atx_ac *ac, *ac_tmp;
+ struct ath_atx_tid *tid, *tid_tmp;
+ struct ath_txq *txq;
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i)) {
+ txq = &sc->sc_txq[i];
+
+ if (likely(bh_flag))
+ spin_lock_bh(&txq->axq_lock);
+ else
+ spin_lock(&txq->axq_lock);
+
+ list_for_each_entry_safe(ac,
+ ac_tmp, &txq->axq_acq, list) {
+ tid = list_first_entry(&ac->tid_q,
+ struct ath_atx_tid, list);
+ if (tid && tid->an != an)
+ continue;
+ list_del(&ac->list);
+ ac->sched = false;
+
+ list_for_each_entry_safe(tid,
+ tid_tmp, &ac->tid_q, list) {
+ list_del(&tid->list);
+ tid->sched = false;
+ ath_tid_drain(sc, txq, tid, bh_flag);
+ tid->addba_exchangecomplete = 0;
+ tid->addba_exchangeattempts = 0;
+ tid->cleanup_inprogress = false;
+ }
+ }
+
+ if (likely(bh_flag))
+ spin_unlock_bh(&txq->axq_lock);
+ else
+ spin_unlock(&txq->axq_lock);
+ }
+ }
+}
+
+/* Cleanup per node transmit state */
+
+void ath_tx_node_free(struct ath_softc *sc, struct ath_node *an)
+{
+ if (sc->sc_txaggr) {
+ struct ath_atx_tid *tid;
+ int tidno, i;
+
+ /* Init per tid rx state */
+ for (tidno = 0, tid = &an->an_aggr.tx.tid[tidno];
+ tidno < WME_NUM_TID;
+ tidno++, tid++) {
+
+ for (i = 0; i < ATH_TID_MAX_BUFS; i++)
+ ASSERT(tid->tx_buf[i] == NULL);
+ }
+ }
+}
