2009-01-16 16:12:01

by Sujith

Subject: [PATCH 3/9] ath9k: Reorganize code in xmit.c

This patch starts cleaning up all the crufty code in transmission path,
grouping functions into logical blocks.

Signed-off-by: Sujith <[email protected]>
---
drivers/net/wireless/ath9k/core.h | 6 -
drivers/net/wireless/ath9k/rc.c | 2 +-
drivers/net/wireless/ath9k/xmit.c | 2596 +++++++++++++++++--------------------
3 files changed, 1180 insertions(+), 1424 deletions(-)

diff --git a/drivers/net/wireless/ath9k/core.h b/drivers/net/wireless/ath9k/core.h
index b687ae9..4eb21a7 100644
--- a/drivers/net/wireless/ath9k/core.h
+++ b/drivers/net/wireless/ath9k/core.h
@@ -490,23 +490,17 @@ void ath_tx_draintxq(struct ath_softc *sc,
struct ath_txq *txq, bool retry_tx);
void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an);
void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an);
-void ath_tx_node_free(struct ath_softc *sc, struct ath_node *an);
void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq);
int ath_tx_init(struct ath_softc *sc, int nbufs);
int ath_tx_cleanup(struct ath_softc *sc);
-int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype);
struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb);
int ath_txq_update(struct ath_softc *sc, int qnum,
struct ath9k_tx_queue_info *q);
int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
struct ath_tx_control *txctl);
void ath_tx_tasklet(struct ath_softc *sc);
-u32 ath_txq_depth(struct ath_softc *sc, int qnum);
-u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum);
void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb);
-void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid);
bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno);
-void ath_tx_aggr_teardown(struct ath_softc *sc, struct ath_node *an, u8 tidno);
int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
u16 tid, u16 *ssn);
int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid);
diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c
index 68bda23..46172b5 100644
--- a/drivers/net/wireless/ath9k/rc.c
+++ b/drivers/net/wireless/ath9k/rc.c
@@ -23,7 +23,7 @@ static struct ath_rate_table ar5416_11na_ratetable = {
{ VALID, VALID, WLAN_RC_PHY_OFDM, 6000, /* 6 Mb */
5400, 0x0b, 0x00, 12,
0, 2, 1, 0, 0, 0, 0, 0 },
- { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
+ { VALID, VALID, WLAN_RC_PHY_OFDM, 9000, /* 9 Mb */
7800, 0x0f, 0x00, 18,
0, 3, 1, 1, 1, 1, 1, 0 },
{ VALID, VALID, WLAN_RC_PHY_OFDM, 12000, /* 12 Mb */
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c
index 522078d..5e6e5cf 100644
--- a/drivers/net/wireless/ath9k/xmit.c
+++ b/drivers/net/wireless/ath9k/xmit.c
@@ -55,94 +55,19 @@ static u32 bits_per_symbol[][2] = {

#define IS_HT_RATE(_rate) ((_rate) & 0x80)

-/*
- * 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_send_normal(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct list_head *bf_head);
+static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+ struct list_head *bf_q,
+ int txok, int sendbar);
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,
- "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth);
-
- if (txq->axq_link == NULL) {
- ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
- DPRINTF(sc, ATH_DBG_XMIT,
- "TXDP[%u] = %llx (%p)\n",
- txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
- } else {
- *txq->axq_link = bf->bf_daddr;
- DPRINTF(sc, ATH_DBG_XMIT, "link[%u] (%p)=%llx (%p)\n",
- 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);
-}
+ struct list_head *head);
+static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf);

-static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
- struct ath_xmit_status *tx_status)
-{
- struct ieee80211_hw *hw = sc->hw;
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
- int hdrlen, padsize;
-
- DPRINTF(sc, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
-
- if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK ||
- tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
- kfree(tx_info_priv);
- tx_info->rate_driver_data[0] = NULL;
- }
-
- if (tx_status->flags & ATH_TX_BAR) {
- tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
- tx_status->flags &= ~ATH_TX_BAR;
- }
-
- if (!(tx_status->flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) {
- /* Frame was ACKed */
- tx_info->flags |= IEEE80211_TX_STAT_ACK;
- }
-
- tx_info->status.rates[0].count = tx_status->retries + 1;
-
- hdrlen = ieee80211_get_hdrlen_from_skb(skb);
- padsize = hdrlen & 3;
- if (padsize && hdrlen >= 24) {
- /*
- * Remove MAC header padding before giving the frame back to
- * mac80211.
- */
- memmove(skb->data + padsize, skb->data, hdrlen);
- skb_pull(skb, padsize);
- }
-
- ieee80211_tx_status(hw, skb);
-}
-
-/* Check if it's okay to send out aggregates */
+/*********************/
+/* Aggregation logic */
+/*********************/

static int ath_aggr_query(struct ath_softc *sc, struct ath_node *an, u8 tidno)
{
@@ -156,230 +81,19 @@ static int ath_aggr_query(struct ath_softc *sc, struct ath_node *an, u8 tidno)
return 0;
}

-static void ath_get_beaconconfig(struct ath_softc *sc, int if_id,
- struct ath_beacon_config *conf)
-{
- struct ieee80211_hw *hw = sc->hw;
-
- /* fill in beacon config data */
-
- conf->beacon_interval = hw->conf.beacon_int;
- conf->listen_interval = 100;
- conf->dtim_count = 1;
- conf->bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf->listen_interval;
-}
-
-/* Calculate Atheros packet type from IEEE80211 packet header */
-
-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 bool is_pae(struct sk_buff *skb)
-{
- struct ieee80211_hdr *hdr;
- __le16 fc;
-
- hdr = (struct ieee80211_hdr *)skb->data;
- fc = hdr->frame_control;
-
- if (ieee80211_is_data(fc)) {
- if (ieee80211_is_nullfunc(fc) ||
- /* Port Access Entity (IEEE 802.1X) */
- (skb->protocol == cpu_to_be16(ETH_P_PAE))) {
- return true;
- }
- }
-
- return false;
-}
-
-static int get_hw_crypto_keytype(struct sk_buff *skb)
-{
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
-
- if (tx_info->control.hw_key) {
- if (tx_info->control.hw_key->alg == ALG_WEP)
- return ATH9K_KEY_TYPE_WEP;
- else if (tx_info->control.hw_key->alg == ALG_TKIP)
- return ATH9K_KEY_TYPE_TKIP;
- else if (tx_info->control.hw_key->alg == ALG_CCMP)
- return ATH9K_KEY_TYPE_AES;
- }
-
- return ATH9K_KEY_TYPE_CLEAR;
-}
-
-/* Called only when tx aggregation is enabled and HT is supported */
-
-static void assign_aggr_tid_seqno(struct sk_buff *skb,
- struct ath_buf *bf)
-{
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- struct ieee80211_hdr *hdr;
- struct ath_node *an;
- struct ath_atx_tid *tid;
- __le16 fc;
- u8 *qc;
-
- if (!tx_info->control.sta)
- return;
-
- an = (struct ath_node *)tx_info->control.sta->drv_priv;
- hdr = (struct ieee80211_hdr *)skb->data;
- fc = hdr->frame_control;
-
- /* Get tidno */
-
- if (ieee80211_is_data_qos(fc)) {
- qc = ieee80211_get_qos_ctl(hdr);
- bf->bf_tidno = qc[0] & 0xf;
- }
-
- /* Get seqno */
- /* 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.
- *
- * If fragmentation is on, the sequence number is
- * not overridden, since it has been
- * incremented by the fragmentation routine.
- *
- * FIXME: check if the fragmentation threshold exceeds
- * IEEE80211 max.
- */
- tid = ATH_AN_2_TID(an, bf->bf_tidno);
- hdr->seq_ctrl = cpu_to_le16(tid->seq_next <<
- IEEE80211_SEQ_SEQ_SHIFT);
- bf->bf_seqno = tid->seq_next;
- INCR(tid->seq_next, IEEE80211_SEQ_MAX);
-}
-
-static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb,
- struct ath_txq *txq)
-{
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- int flags = 0;
-
- flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
- flags |= ATH9K_TXDESC_INTREQ;
-
- if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
- flags |= ATH9K_TXDESC_NOACK;
- if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
- flags |= ATH9K_TXDESC_RTSENA;
-
- return flags;
-}
-
-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;
-}
-
-/* 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;
- unsigned long flags;
-
- /*
- * 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_isxretried(bf))
- tx_status.flags |= ATH_TX_XRETRY;
- }
-
- /* Unmap this frame */
- dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
-
- /* complete this frame */
- ath_tx_complete(sc, skb, &tx_status);
-
- /*
- * 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);
-}
-
-/*
- * 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;

@@ -387,22 +101,16 @@ static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
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->tx.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)
+static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
{
struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum];

@@ -417,63 +125,39 @@ void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
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)
+static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
{
- 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 (ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED)
- return 0;
+ struct ath_txq *txq = &sc->tx.txq[tid->ac->qnum];
+ struct ath_buf *bf;
+ struct list_head bf_head;
+ INIT_LIST_HEAD(&bf_head);

- isaggr = bf_isaggr(bf);
- if (isaggr) {
- seq_st = ATH_DS_BA_SEQ(ds);
- memcpy(ba, ATH_DS_BA_BITMAP(ds), WME_BA_BMP_SIZE >> 3);
- }
+ ASSERT(tid->paused > 0);
+ spin_lock_bh(&txq->axq_lock);

- while (bf) {
- ba_index = ATH_BA_INDEX(seq_st, bf->bf_seqno);
- if (!txok || (isaggr && !ATH_BA_ISSET(ba, ba_index)))
- nbad++;
+ tid->paused--;

- bf = bf->bf_next;
+ if (tid->paused > 0) {
+ spin_unlock_bh(&txq->axq_lock);
+ return;
}

- 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_state.bf_type |= BUF_RETRY;
- bf->bf_retries++;
+ while (!list_empty(&tid->buf_q)) {
+ bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
+ ASSERT(!bf_isretried(bf));
+ list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
+ ath_tx_send_normal(sc, txq, tid, &bf_head);
+ }

- skb = bf->bf_mpdu;
- hdr = (struct ieee80211_hdr *)skb->data;
- hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
+ spin_unlock_bh(&txq->axq_lock);
}

-/* Update block ack window */
-
static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
int seqno)
{
@@ -490,247 +174,75 @@ static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
}
}

-/*
- * 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)
-{
- struct ath_rate_table *rate_table = sc->cur_rate_table;
- u32 nbits, nsymbits, duration, nsymbols;
- u8 rc;
- int streams, pktlen;
-
- pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen;
- rc = rate_table->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, rate_table, 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)
+static void ath_tx_addto_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
+ struct ath_buf *bf)
{
- struct ath_hal *ah = sc->sc_ah;
- struct ath_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];
- struct sk_buff *skb;
- struct ieee80211_tx_info *tx_info;
- struct ieee80211_tx_rate *rates;
- struct ieee80211_hdr *hdr;
- struct ieee80211_hw *hw = sc->hw;
- int i, flags, rtsctsena = 0, enable_g_protection = 0;
- u32 ctsduration = 0;
- u8 rix = 0, cix, ctsrate = 0;
- __le16 fc;
-
- memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
-
- skb = (struct sk_buff *)bf->bf_mpdu;
- hdr = (struct ieee80211_hdr *)skb->data;
- fc = hdr->frame_control;
- tx_info = IEEE80211_SKB_CB(skb);
- rates = tx_info->control.rates;
-
- if (ieee80211_has_morefrags(fc) ||
- (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
- rates[1].count = rates[2].count = rates[3].count = 0;
- rates[1].idx = rates[2].idx = rates[3].idx = 0;
- rates[0].count = ATH_TXMAXTRY;
- }
-
- /* get the cix for the lowest valid rix */
- rt = sc->cur_rate_table;
- for (i = 3; i >= 0; i--) {
- if (rates[i].count && (rates[i].idx >= 0)) {
- rix = rates[i].idx;
- break;
- }
- }
-
- flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA));
- cix = rt->info[rix].ctrl_rate;
-
- /* All protection frames are transmited at 2Mb/s for 802.11g,
- * otherwise we transmit them at 1Mb/s */
- if (hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
- !conf_is_ht(&hw->conf))
- enable_g_protection = 1;
-
- /*
- * 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 && !(bf->bf_flags & ATH9K_TXDESC_NOACK)
- && (rt->info[rix].phy == WLAN_RC_PHY_OFDM ||
- WLAN_RC_PHY_HT(rt->info[rix].phy))) {
- 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[enable_g_protection].ctrl_rate;
- 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.hw_caps & ATH9K_HW_CAP_HT) && bf_isdata(bf)) {
- /* 802.11g protection not needed, use our default behavior */
- if (!rtsctsena)
- flags = ATH9K_TXDESC_RTSENA;
- }
-
- /* Set protection if aggregate protection on */
- if (sc->sc_config.ath_aggr_prot &&
- (!bf_isaggr(bf) || (bf_isaggr(bf) && bf->bf_al < 8192))) {
- flags = ATH9K_TXDESC_RTSENA;
- cix = rt->info[enable_g_protection].ctrl_rate;
- rtsctsena = 1;
- }
-
- /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
- if (bf_isaggr(bf) && (bf->bf_al > ah->ah_caps.rts_aggr_limit))
- 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
- */
- ctsrate = rt->info[cix].ratecode |
- (bf_isshpreamble(bf) ? rt->info[cix].short_preamble : 0);
-
- for (i = 0; i < 4; i++) {
- if (!rates[i].count || (rates[i].idx < 0))
- continue;
-
- rix = rates[i].idx;
-
- series[i].Rate = rt->info[rix].ratecode |
- (bf_isshpreamble(bf) ? rt->info[rix].short_preamble : 0);
-
- series[i].Tries = rates[i].count;
+ int index, cindex;

- series[i].RateFlags = (
- (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) ?
- ATH9K_RATESERIES_RTS_CTS : 0) |
- ((rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ?
- ATH9K_RATESERIES_2040 : 0) |
- ((rates[i].flags & IEEE80211_TX_RC_SHORT_GI) ?
- ATH9K_RATESERIES_HALFGI : 0);
+ if (bf_isretried(bf))
+ return;

- series[i].PktDuration = ath_pkt_duration(sc, rix, bf,
- (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) != 0,
- (rates[i].flags & IEEE80211_TX_RC_SHORT_GI),
- bf_isshpreamble(bf));
+ index = ATH_BA_INDEX(tid->seq_start, bf->bf_seqno);
+ cindex = (tid->baw_head + index) & (ATH_TID_MAX_BUFS - 1);

- series[i].ChSel = sc->sc_tx_chainmask;
+ ASSERT(tid->tx_buf[cindex] == NULL);
+ tid->tx_buf[cindex] = bf;

- if (rtsctsena)
- series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+ 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);
}
-
- /* set dur_update_en for l-sig computation except for PS-Poll frames */
- ath9k_hw_set11n_ratescenario(ah, ds, lastds, !bf_ispspoll(bf),
- 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
+ * 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.
*/
-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;
-
- BUG_ON(list_empty(bf_head));
-
- bf = list_first_entry(bf_head, struct ath_buf, list);
- bf->bf_state.bf_type &= ~BUF_AMPDU; /* regular HT frame */
-
- /* 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_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
+ struct ath_atx_tid *tid)

-static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
{
- struct ath_txq *txq = &sc->tx.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);
+ for (;;) {
+ if (list_empty(&tid->buf_q))
+ break;
+ bf = list_first_entry(&tid->buf_q, struct ath_buf, list);

- tid->paused--;
+ list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);

- if (tid->paused > 0) {
- spin_unlock_bh(&txq->axq_lock);
- return;
- }
+ if (bf_isretried(bf))
+ ath_tx_update_baw(sc, tid, bf->bf_seqno);

- while (!list_empty(&tid->buf_q)) {
- bf = list_first_entry(&tid->buf_q, struct ath_buf, list);
- ASSERT(!bf_isretried(bf));
- list_cut_position(&bf_head, &tid->buf_q, &bf->bf_lastfrm->list);
- ath_tx_send_normal(sc, txq, tid, &bf_head);
+ spin_unlock(&txq->axq_lock);
+ ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+ spin_lock(&txq->axq_lock);
}

- spin_unlock_bh(&txq->axq_lock);
+ tid->seq_next = tid->seq_start;
+ tid->baw_tail = tid->baw_head;
}

-/* Completion routine of an aggregate */
+static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
+{
+ struct sk_buff *skb;
+ struct ieee80211_hdr *hdr;
+
+ bf->bf_state.bf_type |= BUF_RETRY;
+ bf->bf_retries++;
+
+ skb = bf->bf_mpdu;
+ hdr = (struct ieee80211_hdr *)skb->data;
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
+}

-static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
- struct ath_txq *txq,
- struct ath_buf *bf,
- struct list_head *bf_q,
+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 = NULL;
@@ -757,14 +269,9 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
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);
+ memcpy(ba, ATH_DS_BA_BITMAP(ds),
+ WME_BA_BMP_SIZE >> 3);
} else {
memset(ba, 0, WME_BA_BMP_SIZE >> 3);

@@ -816,31 +323,15 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
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 (bf_next == NULL) {
+ ASSERT(bf->bf_lastfrm == bf_last);
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 {
@@ -858,18 +349,11 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
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;
@@ -950,8 +434,6 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
*/
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);
@@ -963,292 +445,7 @@ static void ath_tx_complete_aggr_rifs(struct ath_softc *sc,
return;
}

-static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds, int nbad)
-{
- struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
-
- tx_info_priv->update_rc = false;
- 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 (bf_isdata(bf)) {
- memcpy(&tx_info_priv->tx, &ds->ds_txstat,
- sizeof(tx_info_priv->tx));
- tx_info_priv->n_frames = bf->bf_nframes;
- tx_info_priv->n_bad_frames = nbad;
- tx_info_priv->update_rc = true;
- }
- }
-}
-
-/* Process completed xmit descriptors from the specified queue */
-
-static void 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;
- int txok, nbad = 0;
- int status;
-
- DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
- txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
- txq->axq_link);
-
- 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);
-
- /*
- * 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_isaggr(bf))
- 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->tx.txbuflock);
- list_add_tail(&bf_held->list, &sc->tx.txbuf);
- spin_unlock_bh(&sc->tx.txbuflock);
- }
-
- if (!bf_isampdu(bf)) {
- /*
- * 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_state.bf_type |= BUF_XRETRY;
- nbad = 0;
- } else {
- nbad = ath_tx_num_badfrms(sc, bf, txok);
- }
-
- ath_tx_rc_status(bf, ds, nbad);
-
- /*
- * Complete this transmit unit
- */
- if (bf_isampdu(bf))
- 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_flags & SC_OP_TXAGGR)
- ath_txq_schedule(sc, txq);
- spin_unlock_bh(&txq->axq_lock);
- }
-}
-
-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, "tx queue [%u] %x, link %p\n",
- 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, npend = 0;
-
- if (!(sc->sc_flags & SC_OP_INVALID)) {
- for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
- if (ATH_TXQ_SETUP(sc, i)) {
- ath_tx_stopdma(sc, &sc->tx.txq[i]);
- /* The TxDMA may not really be stopped.
- * Double check the hal tx pending count */
- npend += ath9k_hw_numtxpending(ah,
- sc->tx.txq[i].axq_qnum);
- }
- }
- }
-
- if (npend) {
- int r;
- /* TxDMA not stopped, reset the hal */
- DPRINTF(sc, ATH_DBG_XMIT, "Unable to stop TxDMA. Reset HAL!\n");
-
- spin_lock_bh(&sc->sc_resetlock);
- r = ath9k_hw_reset(ah, sc->sc_ah->ah_curchan, true);
- if (r)
- DPRINTF(sc, ATH_DBG_FATAL,
- "Unable to reset hardware; reset status %u\n",
- r);
- 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->tx.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_isretried(bf))
- 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_atx_tid *tid,
- struct list_head *bf_head,
- struct ath_tx_control *txctl)
-{
- struct ath_buf *bf;
-
- BUG_ON(list_empty(bf_head));
-
- bf = list_first_entry(bf_head, struct ath_buf, list);
- bf->bf_state.bf_type |= BUF_AMPDU;
-
- /*
- * 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) ||
- txctl->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(txctl->txq, tid);
- return 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, txctl->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,
+static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
struct ath_atx_tid *tid)
{
struct ath_rate_table *rate_table = sc->cur_rate_table;
@@ -1314,10 +511,8 @@ static u32 ath_lookup_rate(struct ath_softc *sc,
* 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_atx_tid *tid,
- struct ath_buf *bf,
- u16 frmlen)
+static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
+ struct ath_buf *bf, u16 frmlen)
{
struct ath_rate_table *rt = sc->cur_rate_table;
struct sk_buff *skb = bf->bf_mpdu;
@@ -1381,16 +576,10 @@ static int ath_compute_num_delims(struct ath_softc *sc,
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)
+ 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;
@@ -1485,15 +674,6 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
}
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;
@@ -1503,12 +683,8 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
#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)
+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;
@@ -1588,313 +764,190 @@ static void ath_tx_sched_aggr(struct ath_softc *sc,
status != ATH_AGGR_BAW_CLOSED);
}

-/* Called with txq lock held */
+int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
+ u16 tid, u16 *ssn)
+{
+ struct ath_atx_tid *txtid;
+ struct ath_node *an;

-static void ath_tid_drain(struct ath_softc *sc,
- struct ath_txq *txq,
- struct ath_atx_tid *tid)
+ an = (struct ath_node *)sta->drv_priv;
+
+ if (sc->sc_flags & SC_OP_TXAGGR) {
+ txtid = ATH_AN_2_TID(an, tid);
+ txtid->state |= AGGR_ADDBA_PROGRESS;
+ ath_tx_pause_tid(sc, txtid);
+ }

+ return 0;
+}
+
+int 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 = &sc->tx.txq[txtid->ac->qnum];
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);
+ if (txtid->state & AGGR_CLEANUP)
+ return 0;

- /* update baw for software retried frame */
- if (bf_isretried(bf))
- ath_tx_update_baw(sc, tid, bf->bf_seqno);
+ if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
+ txtid->addba_exchangeattempts = 0;
+ return 0;
+ }

- /*
- * do not indicate packets while holding txq spinlock.
- * unlock is intentional here
- */
- spin_unlock(&txq->axq_lock);
+ ath_tx_pause_tid(sc, txtid);

- /* complete this sub-frame */
+ /* 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_isretried(bf)) {
+ /*
+ * 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);
ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+ }

- spin_lock(&txq->axq_lock);
+ if (txtid->baw_head != txtid->baw_tail) {
+ spin_unlock_bh(&txq->axq_lock);
+ txtid->state |= AGGR_CLEANUP;
+ } else {
+ txtid->state &= ~AGGR_ADDBA_COMPLETE;
+ txtid->addba_exchangeattempts = 0;
+ spin_unlock_bh(&txq->axq_lock);
+ ath_tx_flush_tid(sc, txtid);
}

- /*
- * 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;
+ return 0;
}

-/*
- * 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)
+void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
{
- struct ath_atx_ac *ac, *ac_tmp;
- struct ath_atx_tid *tid, *tid_tmp;
+ struct ath_atx_tid *txtid;
+ struct ath_node *an;

- 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);
- }
+ an = (struct ath_node *)sta->drv_priv;
+
+ if (sc->sc_flags & SC_OP_TXAGGR) {
+ txtid = ATH_AN_2_TID(an, tid);
+ txtid->baw_size =
+ IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
+ txtid->state |= AGGR_ADDBA_COMPLETE;
+ txtid->state &= ~AGGR_ADDBA_PROGRESS;
+ ath_tx_resume_tid(sc, txtid);
}
}

-static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
- struct sk_buff *skb,
- struct ath_tx_control *txctl)
+bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno)
{
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
- struct ath_tx_info_priv *tx_info_priv;
- int hdrlen;
- __le16 fc;
-
- tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC);
- if (unlikely(!tx_info_priv))
- return -ENOMEM;
- tx_info->rate_driver_data[0] = tx_info_priv;
- hdrlen = ieee80211_get_hdrlen_from_skb(skb);
- fc = hdr->frame_control;
-
- ATH_TXBUF_RESET(bf);
-
- /* Frame type */
-
- bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3);
-
- ieee80211_is_data(fc) ?
- (bf->bf_state.bf_type |= BUF_DATA) :
- (bf->bf_state.bf_type &= ~BUF_DATA);
- ieee80211_is_back_req(fc) ?
- (bf->bf_state.bf_type |= BUF_BAR) :
- (bf->bf_state.bf_type &= ~BUF_BAR);
- ieee80211_is_pspoll(fc) ?
- (bf->bf_state.bf_type |= BUF_PSPOLL) :
- (bf->bf_state.bf_type &= ~BUF_PSPOLL);
- (sc->sc_flags & SC_OP_PREAMBLE_SHORT) ?
- (bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE) :
- (bf->bf_state.bf_type &= ~BUF_SHORT_PREAMBLE);
- (conf_is_ht(&sc->hw->conf) && !is_pae(skb) &&
- (tx_info->flags & IEEE80211_TX_CTL_AMPDU)) ?
- (bf->bf_state.bf_type |= BUF_HT) :
- (bf->bf_state.bf_type &= ~BUF_HT);
-
- bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq);
+ struct ath_atx_tid *txtid;

- /* Crypto */
+ if (!(sc->sc_flags & SC_OP_TXAGGR))
+ return false;

- bf->bf_keytype = get_hw_crypto_keytype(skb);
+ txtid = ATH_AN_2_TID(an, tidno);

- if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {
- bf->bf_frmlen += tx_info->control.hw_key->icv_len;
- bf->bf_keyix = tx_info->control.hw_key->hw_key_idx;
- } else {
- bf->bf_keyix = ATH9K_TXKEYIX_INVALID;
+ if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
+ if (!(txtid->state & AGGR_ADDBA_PROGRESS) &&
+ (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) {
+ txtid->addba_exchangeattempts++;
+ return true;
+ }
}

- /* Assign seqno, tidno */
-
- if (ieee80211_is_data_qos(fc) && (sc->sc_flags & SC_OP_TXAGGR))
- assign_aggr_tid_seqno(skb, bf);
-
- /* DMA setup */
- bf->bf_mpdu = skb;
+ return false;
+}

- bf->bf_dmacontext = dma_map_single(sc->dev, skb->data,
- skb->len, DMA_TO_DEVICE);
- if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) {
- bf->bf_mpdu = NULL;
- DPRINTF(sc, ATH_DBG_CONFIG,
- "dma_mapping_error() on TX\n");
- return -ENOMEM;
- }
+/********************/
+/* Queue Management */
+/********************/

- bf->bf_buf_addr = bf->bf_dmacontext;
- return 0;
+static u32 ath_txq_depth(struct ath_softc *sc, int qnum)
+{
+ return sc->tx.txq[qnum].axq_depth;
}

-/* FIXME: tx power */
-static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
- struct ath_tx_control *txctl)
+static void ath_tx_stopdma(struct ath_softc *sc, struct ath_txq *txq)
{
- struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
- struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
- struct ath_node *an = NULL;
- struct list_head bf_head;
- struct ath_desc *ds;
- struct ath_atx_tid *tid;
struct ath_hal *ah = sc->sc_ah;
- int frm_type;
-
- frm_type = get_hw_packet_type(skb);
-
- INIT_LIST_HEAD(&bf_head);
- list_add_tail(&bf->list, &bf_head);
-
- /* setup descriptor */
-
- ds = bf->bf_desc;
- ds->ds_link = 0;
- ds->ds_data = bf->bf_buf_addr;
-
- /* Formulate first tx descriptor with tx controls */
-
- ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER,
- bf->bf_keyix, bf->bf_keytype, bf->bf_flags);
-
- ath9k_hw_filltxdesc(ah, ds,
- skb->len, /* segment length */
- true, /* first segment */
- true, /* last segment */
- ds); /* first descriptor */
-
- bf->bf_lastfrm = bf;
-
- spin_lock_bh(&txctl->txq->axq_lock);
-
- if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) &&
- tx_info->control.sta) {
- an = (struct ath_node *)tx_info->control.sta->drv_priv;
- tid = ATH_AN_2_TID(an, bf->bf_tidno);
-
- if (ath_aggr_query(sc, an, bf->bf_tidno)) {
- /*
- * Try aggregation if it's a unicast data frame
- * and the destination is HT capable.
- */
- ath_tx_send_ampdu(sc, tid, &bf_head, txctl);
- } else {
- /*
- * Send this frame as regular when ADDBA
- * exchange is neither complete nor pending.
- */
- ath_tx_send_normal(sc, txctl->txq,
- tid, &bf_head);
- }
- } else {
- bf->bf_lastbf = bf;
- bf->bf_nframes = 1;
-
- ath_buf_set_rate(sc, bf);
- ath_tx_txqaddbuf(sc, txctl->txq, &bf_head);
- }
-
- spin_unlock_bh(&txctl->txq->axq_lock);
+ (void) ath9k_hw_stoptxdma(ah, txq->axq_qnum);
}

-/* Upon failure caller should free skb */
-int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
- struct ath_tx_control *txctl)
+static void ath_get_beaconconfig(struct ath_softc *sc, int if_id,
+ struct ath_beacon_config *conf)
{
- struct ath_buf *bf;
- int r;
-
- /* Check if a tx buffer is available */
-
- bf = ath_tx_get_buffer(sc);
- if (!bf) {
- DPRINTF(sc, ATH_DBG_XMIT, "TX buffers are full\n");
- return -1;
- }
-
- r = ath_tx_setup_buffer(sc, bf, skb, txctl);
- if (unlikely(r)) {
- struct ath_txq *txq = txctl->txq;
-
- DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n");
-
- /* upon ath_tx_processq() this TX queue will be resumed, we
- * guarantee this will happen by knowing beforehand that
- * we will at least have to run TX completionon one buffer
- * on the queue */
- spin_lock_bh(&txq->axq_lock);
- if (ath_txq_depth(sc, txq->axq_qnum) > 1) {
- ieee80211_stop_queue(sc->hw,
- skb_get_queue_mapping(skb));
- txq->stopped = 1;
- }
- spin_unlock_bh(&txq->axq_lock);
-
- spin_lock_bh(&sc->tx.txbuflock);
- list_add_tail(&bf->list, &sc->tx.txbuf);
- spin_unlock_bh(&sc->tx.txbuflock);
-
- return r;
- }
+ struct ieee80211_hw *hw = sc->hw;

- ath_tx_start_dma(sc, bf, txctl);
+ /* fill in beacon config data */

- return 0;
+ conf->beacon_interval = hw->conf.beacon_int;
+ conf->listen_interval = 100;
+ conf->dtim_count = 1;
+ conf->bmiss_timeout = ATH_DEFAULT_BMISS_LIMIT * conf->listen_interval;
}

-/* Initialize TX queue and h/w */
-
-int ath_tx_init(struct ath_softc *sc, int nbufs)
+static void ath_drain_txdataq(struct ath_softc *sc, bool retry_tx)
{
- int error = 0;
-
- do {
- spin_lock_init(&sc->tx.txbuflock);
+ struct ath_hal *ah = sc->sc_ah;
+ int i, npend = 0;

- /* Setup tx descriptors */
- error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
- "tx", nbufs, 1);
- if (error != 0) {
- DPRINTF(sc, ATH_DBG_FATAL,
- "Failed to allocate tx descriptors: %d\n",
- error);
- break;
+ if (!(sc->sc_flags & SC_OP_INVALID)) {
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i)) {
+ ath_tx_stopdma(sc, &sc->tx.txq[i]);
+ npend += ath9k_hw_numtxpending(ah,
+ sc->tx.txq[i].axq_qnum);
+ }
}
+ }

- /* XXX allocate beacon state together with vap */
- error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
- "beacon", ATH_BCBUF, 1);
- if (error != 0) {
- DPRINTF(sc, ATH_DBG_FATAL,
- "Failed to allocate beacon descriptors: %d\n",
- error);
- break;
- }
+ if (npend) {
+ int r;

- } while (0);
+ DPRINTF(sc, ATH_DBG_XMIT, "Unable to stop TxDMA. Reset HAL!\n");

- if (error != 0)
- ath_tx_cleanup(sc);
+ spin_lock_bh(&sc->sc_resetlock);
+ r = ath9k_hw_reset(ah, sc->sc_ah->ah_curchan, true);
+ if (r)
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "Unable to reset hardware; reset status %u\n",
+ r);
+ spin_unlock_bh(&sc->sc_resetlock);
+ }

- return error;
+ for (i = 0; i < ATH9K_NUM_TX_QUEUES; i++) {
+ if (ATH_TXQ_SETUP(sc, i))
+ ath_tx_draintxq(sc, &sc->tx.txq[i], retry_tx);
+ }
}

-/* Reclaim all tx queue resources */
-
-int ath_tx_cleanup(struct ath_softc *sc)
+static void ath_txq_drain_pending_buffers(struct ath_softc *sc,
+ struct ath_txq *txq)
{
- /* cleanup beacon descriptors */
- if (sc->beacon.bdma.dd_desc_len != 0)
- ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf);
-
- /* cleanup tx descriptors */
- if (sc->tx.txdma.dd_desc_len != 0)
- ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf);
+ struct ath_atx_ac *ac, *ac_tmp;
+ struct ath_atx_tid *tid, *tid_tmp;

- return 0;
+ 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);
+ }
+ }
}

-/* 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;
@@ -1960,43 +1013,7 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
return &sc->tx.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->tx.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->tx.hwq_map)) {
- DPRINTF(sc, ATH_DBG_FATAL,
- "HAL AC %u out of range, max %zu!\n",
- haltype, ARRAY_SIZE(sc->tx.hwq_map));
- return 0;
- }
- txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype);
- if (txq != NULL) {
- sc->tx.hwq_map[haltype] = txq->axq_qnum;
- return 1;
- } else
- return 0;
-}
-
-int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype)
+static int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype)
{
int qnum;

@@ -2022,8 +1039,6 @@ int ath_tx_get_qnum(struct ath_softc *sc, int qtype, int haltype)
return qnum;
}

-/* Get a transmit queue, if available */
-
struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)
{
struct ath_txq *txq = NULL;
@@ -2034,7 +1049,6 @@ struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)

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,
"TX queue: %d is full, depth: %d\n",
@@ -2050,8 +1064,6 @@ struct ath_txq *ath_test_get_txq(struct ath_softc *sc, struct sk_buff *skb)
return txq;
}

-/* Update parameters for a transmit queue */
-
int ath_txq_update(struct ath_softc *sc, int qnum,
struct ath9k_tx_queue_info *qinfo)
{
@@ -2083,7 +1095,7 @@ int ath_txq_update(struct ath_softc *sc, int qnum,
"Unable to update hardware queue %u!\n", qnum);
error = -EIO;
} else {
- ath9k_hw_resettxqueue(ah, qnum); /* push to h/w */
+ ath9k_hw_resettxqueue(ah, qnum);
}

return error;
@@ -2112,26 +1124,7 @@ int ath_cabq_update(struct ath_softc *sc)
return 0;
}

-/* Deferred processing of transmit interrupt */
-
-void ath_tx_tasklet(struct ath_softc *sc)
-{
- int i;
- 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)))
- ath_tx_processq(sc, &sc->tx.txq[i]);
- }
-}
-
-void ath_tx_draintxq(struct ath_softc *sc,
- struct ath_txq *txq, bool retry_tx)
+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;
@@ -2191,44 +1184,245 @@ void ath_tx_draintxq(struct ath_softc *sc,
}
}

-/* Drain the transmit queues and reclaim resources */
+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);
+}

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_flags & SC_OP_INVALID)) {
+ if (!(sc->sc_flags & SC_OP_INVALID))
(void) ath9k_hw_stoptxdma(sc->sc_ah, sc->beacon.beaconq);
- DPRINTF(sc, ATH_DBG_XMIT, "beacon queue %x\n",
- ath9k_hw_gettxbuf(sc->sc_ah, sc->beacon.beaconq));
- }

ath_drain_txdataq(sc, retry_tx);
}

-u32 ath_txq_depth(struct ath_softc *sc, int qnum)
+void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
{
- return sc->tx.txq[qnum].axq_depth;
+ struct ath_atx_ac *ac;
+ struct ath_atx_tid *tid;
+
+ if (list_empty(&txq->axq_acq))
+ return;
+
+ ac = list_first_entry(&txq->axq_acq, struct ath_atx_ac, list);
+ list_del(&ac->list);
+ ac->sched = false;
+
+ do {
+ 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)
+ continue;
+
+ if ((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);
+
+ break;
+ } while (!list_empty(&ac->tid_q));
+
+ if (!list_empty(&ac->tid_q)) {
+ if (!ac->sched) {
+ ac->sched = true;
+ list_add_tail(&ac->list, &txq->axq_acq);
+ }
+ }
+}
+
+int ath_tx_setup(struct ath_softc *sc, int haltype)
+{
+ struct ath_txq *txq;
+
+ if (haltype >= ARRAY_SIZE(sc->tx.hwq_map)) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "HAL AC %u out of range, max %zu!\n",
+ haltype, ARRAY_SIZE(sc->tx.hwq_map));
+ return 0;
+ }
+ txq = ath_txq_setup(sc, ATH9K_TX_QUEUE_DATA, haltype);
+ if (txq != NULL) {
+ sc->tx.hwq_map[haltype] = txq->axq_qnum;
+ return 1;
+ } else
+ return 0;
}

-u32 ath_txq_aggr_depth(struct ath_softc *sc, int qnum)
+/***********/
+/* 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)
{
- return sc->tx.txq[qnum].axq_aggr_depth;
+ 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,
+ "qnum: %d, txq depth: %d\n", txq->axq_qnum, txq->axq_depth);
+
+ if (txq->axq_link == NULL) {
+ ath9k_hw_puttxbuf(ah, txq->axq_qnum, bf->bf_daddr);
+ DPRINTF(sc, ATH_DBG_XMIT,
+ "TXDP[%u] = %llx (%p)\n",
+ txq->axq_qnum, ito64(bf->bf_daddr), bf->bf_desc);
+ } else {
+ *txq->axq_link = bf->bf_daddr;
+ DPRINTF(sc, ATH_DBG_XMIT, "link[%u] (%p)=%llx (%p)\n",
+ 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);
}

-bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno)
+static struct ath_buf *ath_tx_get_buffer(struct ath_softc *sc)
{
- struct ath_atx_tid *txtid;
+ struct ath_buf *bf = NULL;

- if (!(sc->sc_flags & SC_OP_TXAGGR))
- return false;
+ spin_lock_bh(&sc->tx.txbuflock);

- txtid = ATH_AN_2_TID(an, tidno);
+ if (unlikely(list_empty(&sc->tx.txbuf))) {
+ spin_unlock_bh(&sc->tx.txbuflock);
+ return NULL;
+ }

- if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
- if (!(txtid->state & AGGR_ADDBA_PROGRESS) &&
- (txtid->addba_exchangeattempts < ADDBA_EXCHANGE_ATTEMPTS)) {
- txtid->addba_exchangeattempts++;
+ 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_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
+ struct list_head *bf_head,
+ struct ath_tx_control *txctl)
+{
+ struct ath_buf *bf;
+
+ BUG_ON(list_empty(bf_head));
+
+ bf = list_first_entry(bf_head, struct ath_buf, list);
+ bf->bf_state.bf_type |= BUF_AMPDU;
+
+ /*
+ * 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) ||
+ txctl->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(txctl->txq, tid);
+ return;
+ }
+
+ /* 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, txctl->txq, bf_head);
+
+ return;
+}
+
+static void 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;
+
+ BUG_ON(list_empty(bf_head));
+
+ bf = list_first_entry(bf_head, struct ath_buf, list);
+ bf->bf_state.bf_type &= ~BUF_AMPDU;
+
+ /* update starting sequence number for subsequent ADDBA request */
+ INCR(tid->seq_start, IEEE80211_SEQ_MAX);
+
+ bf->bf_nframes = 1;
+ bf->bf_lastbf = bf->bf_lastfrm;
+ ath_buf_set_rate(sc, bf);
+ ath_tx_txqaddbuf(sc, txq, bf_head);
+}
+
+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 bool is_pae(struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr;
+ __le16 fc;
+
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+
+ if (ieee80211_is_data(fc)) {
+ if (ieee80211_is_nullfunc(fc) ||
+ /* Port Access Entity (IEEE 802.1X) */
+ (skb->protocol == cpu_to_be16(ETH_P_PAE))) {
return true;
}
}
@@ -2236,175 +1430,801 @@ bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an, u8 tidno)
return false;
}

-/* Start TX aggregation */
+static int get_hw_crypto_keytype(struct sk_buff *skb)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);

-int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
- u16 tid, u16 *ssn)
+ if (tx_info->control.hw_key) {
+ if (tx_info->control.hw_key->alg == ALG_WEP)
+ return ATH9K_KEY_TYPE_WEP;
+ else if (tx_info->control.hw_key->alg == ALG_TKIP)
+ return ATH9K_KEY_TYPE_TKIP;
+ else if (tx_info->control.hw_key->alg == ALG_CCMP)
+ return ATH9K_KEY_TYPE_AES;
+ }
+
+ return ATH9K_KEY_TYPE_CLEAR;
+}
+
+static void assign_aggr_tid_seqno(struct sk_buff *skb,
+ struct ath_buf *bf)
{
- struct ath_atx_tid *txtid;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr;
struct ath_node *an;
+ struct ath_atx_tid *tid;
+ __le16 fc;
+ u8 *qc;

- an = (struct ath_node *)sta->drv_priv;
+ if (!tx_info->control.sta)
+ return;

- if (sc->sc_flags & SC_OP_TXAGGR) {
- txtid = ATH_AN_2_TID(an, tid);
- txtid->state |= AGGR_ADDBA_PROGRESS;
- ath_tx_pause_tid(sc, txtid);
+ an = (struct ath_node *)tx_info->control.sta->drv_priv;
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+
+ if (ieee80211_is_data_qos(fc)) {
+ qc = ieee80211_get_qos_ctl(hdr);
+ bf->bf_tidno = qc[0] & 0xf;
}

- return 0;
+ /*
+ * 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.
+ *
+ * If fragmentation is on, the sequence number is
+ * not overridden, since it has been
+ * incremented by the fragmentation routine.
+ *
+ * FIXME: check if the fragmentation threshold exceeds
+ * IEEE80211 max.
+ */
+ tid = ATH_AN_2_TID(an, bf->bf_tidno);
+ hdr->seq_ctrl = cpu_to_le16(tid->seq_next <<
+ IEEE80211_SEQ_SEQ_SHIFT);
+ bf->bf_seqno = tid->seq_next;
+ INCR(tid->seq_next, IEEE80211_SEQ_MAX);
}

-/* Stop tx aggregation */
-
-int ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
+static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb,
+ struct ath_txq *txq)
{
- struct ath_node *an = (struct ath_node *)sta->drv_priv;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ int flags = 0;

- ath_tx_aggr_teardown(sc, an, tid);
- return 0;
+ flags |= ATH9K_TXDESC_CLRDMASK; /* needed for crypto errors */
+ flags |= ATH9K_TXDESC_INTREQ;
+
+ if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
+ flags |= ATH9K_TXDESC_NOACK;
+ if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
+ flags |= ATH9K_TXDESC_RTSENA;
+
+ return flags;
}

-/* Resume tx aggregation */
+/*
+ * 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)
+{
+ struct ath_rate_table *rate_table = sc->cur_rate_table;
+ u32 nbits, nsymbits, duration, nsymbols;
+ u8 rc;
+ int streams, pktlen;

-void ath_tx_aggr_resume(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
+ pktlen = bf_isaggr(bf) ? bf->bf_al : bf->bf_frmlen;
+ rc = rate_table->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, rate_table, 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;
+}
+
+static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
{
- struct ath_atx_tid *txtid;
- struct ath_node *an;
+ struct ath_hal *ah = sc->sc_ah;
+ struct ath_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];
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *tx_info;
+ struct ieee80211_tx_rate *rates;
+ struct ieee80211_hdr *hdr;
+ struct ieee80211_hw *hw = sc->hw;
+ int i, flags, rtsctsena = 0, enable_g_protection = 0;
+ u32 ctsduration = 0;
+ u8 rix = 0, cix, ctsrate = 0;
+ __le16 fc;

- an = (struct ath_node *)sta->drv_priv;
+ memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);

- if (sc->sc_flags & SC_OP_TXAGGR) {
- txtid = ATH_AN_2_TID(an, tid);
- txtid->baw_size =
- IEEE80211_MIN_AMPDU_BUF << sta->ht_cap.ampdu_factor;
- txtid->state |= AGGR_ADDBA_COMPLETE;
- txtid->state &= ~AGGR_ADDBA_PROGRESS;
- ath_tx_resume_tid(sc, txtid);
+ skb = (struct sk_buff *)bf->bf_mpdu;
+ hdr = (struct ieee80211_hdr *)skb->data;
+ fc = hdr->frame_control;
+ tx_info = IEEE80211_SKB_CB(skb);
+ rates = tx_info->control.rates;
+
+ if (ieee80211_has_morefrags(fc) ||
+ (le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG)) {
+ rates[1].count = rates[2].count = rates[3].count = 0;
+ rates[1].idx = rates[2].idx = rates[3].idx = 0;
+ rates[0].count = ATH_TXMAXTRY;
+ }
+
+ /* get the cix for the lowest valid rix */
+ rt = sc->cur_rate_table;
+ for (i = 3; i >= 0; i--) {
+ if (rates[i].count && (rates[i].idx >= 0)) {
+ rix = rates[i].idx;
+ break;
+ }
+ }
+
+ flags = (bf->bf_flags & (ATH9K_TXDESC_RTSENA | ATH9K_TXDESC_CTSENA));
+ cix = rt->info[rix].ctrl_rate;
+
+ /* All protection frames are transmited at 2Mb/s for 802.11g,
+ * otherwise we transmit them at 1Mb/s */
+ if (hw->conf.channel->band == IEEE80211_BAND_2GHZ &&
+ !conf_is_ht(&hw->conf))
+ enable_g_protection = 1;
+
+ /*
+ * 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 && !(bf->bf_flags & ATH9K_TXDESC_NOACK)
+ && (rt->info[rix].phy == WLAN_RC_PHY_OFDM ||
+ WLAN_RC_PHY_HT(rt->info[rix].phy))) {
+ 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[enable_g_protection].ctrl_rate;
+ 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.hw_caps & ATH9K_HW_CAP_HT) && bf_isdata(bf)) {
+ /* 802.11g protection not needed, use our default behavior */
+ if (!rtsctsena)
+ flags = ATH9K_TXDESC_RTSENA;
+ }
+
+ /* Set protection if aggregate protection on */
+ if (sc->sc_config.ath_aggr_prot &&
+ (!bf_isaggr(bf) || (bf_isaggr(bf) && bf->bf_al < 8192))) {
+ flags = ATH9K_TXDESC_RTSENA;
+ cix = rt->info[enable_g_protection].ctrl_rate;
+ rtsctsena = 1;
+ }
+
+ /* For AR5416 - RTS cannot be followed by a frame larger than 8K */
+ if (bf_isaggr(bf) && (bf->bf_al > ah->ah_caps.rts_aggr_limit))
+ 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
+ */
+ ctsrate = rt->info[cix].ratecode |
+ (bf_isshpreamble(bf) ? rt->info[cix].short_preamble : 0);
+
+ for (i = 0; i < 4; i++) {
+ if (!rates[i].count || (rates[i].idx < 0))
+ continue;
+
+ rix = rates[i].idx;
+
+ series[i].Rate = rt->info[rix].ratecode |
+ (bf_isshpreamble(bf) ? rt->info[rix].short_preamble : 0);
+
+ series[i].Tries = rates[i].count;
+
+ series[i].RateFlags = (
+ (rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) ?
+ ATH9K_RATESERIES_RTS_CTS : 0) |
+ ((rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ?
+ ATH9K_RATESERIES_2040 : 0) |
+ ((rates[i].flags & IEEE80211_TX_RC_SHORT_GI) ?
+ ATH9K_RATESERIES_HALFGI : 0);
+
+ series[i].PktDuration = ath_pkt_duration(sc, rix, bf,
+ (rates[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) != 0,
+ (rates[i].flags & IEEE80211_TX_RC_SHORT_GI),
+ bf_isshpreamble(bf));
+
+ series[i].ChSel = sc->sc_tx_chainmask;
+
+ if (rtsctsena)
+ series[i].RateFlags |= ATH9K_RATESERIES_RTS_CTS;
+ }
+
+ /* set dur_update_en for l-sig computation except for PS-Poll frames */
+ ath9k_hw_set11n_ratescenario(ah, ds, lastds, !bf_ispspoll(bf),
+ ctsrate, ctsduration,
+ series, 4, flags);
+
+ if (sc->sc_config.ath_aggr_prot && flags)
+ ath9k_hw_set11n_burstduration(ah, ds, 8192);
}

-/*
- * 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.
- */
+static int ath_tx_setup_buffer(struct ath_softc *sc, struct ath_buf *bf,
+ struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+ struct ath_tx_info_priv *tx_info_priv;
+ int hdrlen;
+ __le16 fc;
+
+ tx_info_priv = kzalloc(sizeof(*tx_info_priv), GFP_ATOMIC);
+ if (unlikely(!tx_info_priv))
+ return -ENOMEM;
+ tx_info->rate_driver_data[0] = tx_info_priv;
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+ fc = hdr->frame_control;
+
+ ATH_TXBUF_RESET(bf);
+
+ bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3);

-void ath_tx_aggr_teardown(struct ath_softc *sc, struct ath_node *an, u8 tid)
+ ieee80211_is_data(fc) ?
+ (bf->bf_state.bf_type |= BUF_DATA) :
+ (bf->bf_state.bf_type &= ~BUF_DATA);
+ ieee80211_is_back_req(fc) ?
+ (bf->bf_state.bf_type |= BUF_BAR) :
+ (bf->bf_state.bf_type &= ~BUF_BAR);
+ ieee80211_is_pspoll(fc) ?
+ (bf->bf_state.bf_type |= BUF_PSPOLL) :
+ (bf->bf_state.bf_type &= ~BUF_PSPOLL);
+ (sc->sc_flags & SC_OP_PREAMBLE_SHORT) ?
+ (bf->bf_state.bf_type |= BUF_SHORT_PREAMBLE) :
+ (bf->bf_state.bf_type &= ~BUF_SHORT_PREAMBLE);
+ (conf_is_ht(&sc->hw->conf) && !is_pae(skb) &&
+ (tx_info->flags & IEEE80211_TX_CTL_AMPDU)) ?
+ (bf->bf_state.bf_type |= BUF_HT) :
+ (bf->bf_state.bf_type &= ~BUF_HT);
+
+ bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq);
+
+ bf->bf_keytype = get_hw_crypto_keytype(skb);
+
+ if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {
+ bf->bf_frmlen += tx_info->control.hw_key->icv_len;
+ bf->bf_keyix = tx_info->control.hw_key->hw_key_idx;
+ } else {
+ bf->bf_keyix = ATH9K_TXKEYIX_INVALID;
+ }
+
+ if (ieee80211_is_data_qos(fc) && (sc->sc_flags & SC_OP_TXAGGR))
+ assign_aggr_tid_seqno(skb, bf);
+
+ bf->bf_mpdu = skb;
+
+ bf->bf_dmacontext = dma_map_single(sc->dev, skb->data,
+ skb->len, DMA_TO_DEVICE);
+ if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) {
+ bf->bf_mpdu = NULL;
+ DPRINTF(sc, ATH_DBG_CONFIG,
+ "dma_mapping_error() on TX\n");
+ return -ENOMEM;
+ }
+
+ bf->bf_buf_addr = bf->bf_dmacontext;
+ return 0;
+}
+
+/* FIXME: tx power */
+static void ath_tx_start_dma(struct ath_softc *sc, struct ath_buf *bf,
+ struct ath_tx_control *txctl)
{
- struct ath_atx_tid *txtid = ATH_AN_2_TID(an, tid);
- struct ath_txq *txq = &sc->tx.txq[txtid->ac->qnum];
- struct ath_buf *bf;
+ struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_node *an = NULL;
struct list_head bf_head;
+ struct ath_desc *ds;
+ struct ath_atx_tid *tid;
+ struct ath_hal *ah = sc->sc_ah;
+ int frm_type;
+
+ frm_type = get_hw_packet_type(skb);
+
INIT_LIST_HEAD(&bf_head);
+ list_add_tail(&bf->list, &bf_head);

- if (txtid->state & AGGR_CLEANUP) /* cleanup is in progress */
- return;
+ ds = bf->bf_desc;
+ ds->ds_link = 0;
+ ds->ds_data = bf->bf_buf_addr;

- if (!(txtid->state & AGGR_ADDBA_COMPLETE)) {
- txtid->addba_exchangeattempts = 0;
- return;
- }
+ ath9k_hw_set11n_txdesc(ah, ds, bf->bf_frmlen, frm_type, MAX_RATE_POWER,
+ bf->bf_keyix, bf->bf_keytype, bf->bf_flags);

- /* TID must be paused first */
- ath_tx_pause_tid(sc, txtid);
+ ath9k_hw_filltxdesc(ah, ds,
+ skb->len, /* segment length */
+ true, /* first segment */
+ true, /* last segment */
+ ds); /* first descriptor */

- /* 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_isretried(bf)) {
+ bf->bf_lastfrm = bf;
+
+ spin_lock_bh(&txctl->txq->axq_lock);
+
+ if (bf_isht(bf) && (sc->sc_flags & SC_OP_TXAGGR) &&
+ tx_info->control.sta) {
+ an = (struct ath_node *)tx_info->control.sta->drv_priv;
+ tid = ATH_AN_2_TID(an, bf->bf_tidno);
+
+ if (ath_aggr_query(sc, an, bf->bf_tidno)) {
/*
- * NB: it's based on the assumption that
- * software retried frame will always stay
- * at the head of software queue.
+ * Try aggregation if it's a unicast data frame
+ * and the destination is HT capable.
*/
- break;
+ ath_tx_send_ampdu(sc, tid, &bf_head, txctl);
+ } else {
+ /*
+ * Send this frame as regular when ADDBA
+ * exchange is neither complete nor pending.
+ */
+ ath_tx_send_normal(sc, txctl->txq,
+ tid, &bf_head);
}
- list_cut_position(&bf_head,
- &txtid->buf_q, &bf->bf_lastfrm->list);
- ath_tx_update_baw(sc, txtid, bf->bf_seqno);
+ } else {
+ bf->bf_lastbf = bf;
+ bf->bf_nframes = 1;

- /* complete this sub-frame */
- ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+ ath_buf_set_rate(sc, bf);
+ ath_tx_txqaddbuf(sc, txctl->txq, &bf_head);
}

- if (txtid->baw_head != txtid->baw_tail) {
- spin_unlock_bh(&txq->axq_lock);
- txtid->state |= AGGR_CLEANUP;
- } else {
- txtid->state &= ~AGGR_ADDBA_COMPLETE;
- txtid->addba_exchangeattempts = 0;
+ spin_unlock_bh(&txctl->txq->axq_lock);
+}
+
+/* Upon failure caller should free skb */
+int ath_tx_start(struct ath_softc *sc, struct sk_buff *skb,
+ struct ath_tx_control *txctl)
+{
+ struct ath_buf *bf;
+ int r;
+
+ bf = ath_tx_get_buffer(sc);
+ if (!bf) {
+ DPRINTF(sc, ATH_DBG_XMIT, "TX buffers are full\n");
+ return -1;
+ }
+
+ r = ath_tx_setup_buffer(sc, bf, skb, txctl);
+ if (unlikely(r)) {
+ struct ath_txq *txq = txctl->txq;
+
+ DPRINTF(sc, ATH_DBG_FATAL, "TX mem alloc failure\n");
+
+ /* upon ath_tx_processq() this TX queue will be resumed, we
+ * guarantee this will happen by knowing beforehand that
+ * we will at least have to run TX completionon one buffer
+ * on the queue */
+ spin_lock_bh(&txq->axq_lock);
+ if (ath_txq_depth(sc, txq->axq_qnum) > 1) {
+ ieee80211_stop_queue(sc->hw,
+ skb_get_queue_mapping(skb));
+ txq->stopped = 1;
+ }
spin_unlock_bh(&txq->axq_lock);
- ath_tx_flush_tid(sc, txtid);
+
+ spin_lock_bh(&sc->tx.txbuflock);
+ list_add_tail(&bf->list, &sc->tx.txbuf);
+ spin_unlock_bh(&sc->tx.txbuflock);
+
+ return r;
}
-}

-/*
- * Tx scheduling logic
- * NB: must be called with txq lock held
- */
+ ath_tx_start_dma(sc, bf, txctl);

-void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
+ return 0;
+}
+
+void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb)
{
- struct ath_atx_ac *ac;
- struct ath_atx_tid *tid;
+ int hdrlen, padsize;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ath_tx_control txctl;

- /* 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;
+ memset(&txctl, 0, sizeof(struct ath_tx_control));

/*
- * process a single tid per destination
+ * As a temporary workaround, assign seq# here; this will likely need
+ * to be cleaned up to work better with Beacon transmission and virtual
+ * BSSes.
*/
- do {
- /* nothing to schedule */
- if (list_empty(&ac->tid_q))
+ if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
+ sc->tx.seq_no += 0x10;
+ hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
+ hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
+ }
+
+ /* Add the padding after the header if this is not already done */
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+ if (hdrlen & 3) {
+ padsize = hdrlen % 4;
+ if (skb_headroom(skb) < padsize) {
+ DPRINTF(sc, ATH_DBG_XMIT, "TX CABQ padding failed\n");
+ dev_kfree_skb_any(skb);
return;
+ }
+ skb_push(skb, padsize);
+ memmove(skb->data, skb->data + padsize, hdrlen);
+ }

- tid = list_first_entry(&ac->tid_q, struct ath_atx_tid, list);
- list_del(&tid->list);
- tid->sched = false;
+ txctl.txq = sc->beacon.cabq;

- if (tid->paused) /* check next tid to keep h/w busy */
- continue;
+ DPRINTF(sc, ATH_DBG_XMIT, "transmitting CABQ packet, skb: %p\n", skb);

- if ((txq->axq_depth % 2) == 0)
- ath_tx_sched_aggr(sc, txq, tid);
+ if (ath_tx_start(sc, skb, &txctl) != 0) {
+ DPRINTF(sc, ATH_DBG_XMIT, "CABQ TX failed\n");
+ goto exit;
+ }

+ return;
+exit:
+ dev_kfree_skb_any(skb);
+}
+
+/*****************/
+/* TX Completion */
+/*****************/
+
+static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
+ struct ath_xmit_status *tx_status)
+{
+ struct ieee80211_hw *hw = sc->hw;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+ int hdrlen, padsize;
+
+ DPRINTF(sc, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
+
+ if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK ||
+ tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
+ kfree(tx_info_priv);
+ tx_info->rate_driver_data[0] = NULL;
+ }
+
+ if (tx_status->flags & ATH_TX_BAR) {
+ tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
+ tx_status->flags &= ~ATH_TX_BAR;
+ }
+
+ if (!(tx_status->flags & (ATH_TX_ERROR | ATH_TX_XRETRY))) {
+ /* Frame was ACKed */
+ tx_info->flags |= IEEE80211_TX_STAT_ACK;
+ }
+
+ tx_info->status.rates[0].count = tx_status->retries + 1;
+
+ hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+ padsize = hdrlen & 3;
+ if (padsize && hdrlen >= 24) {
/*
- * add tid to round-robin queue if more frames
- * are pending for the tid
+ * Remove MAC header padding before giving the frame back to
+ * mac80211.
*/
- if (!list_empty(&tid->buf_q))
- ath_tx_queue_tid(txq, tid);
+ memmove(skb->data + padsize, skb->data, hdrlen);
+ skb_pull(skb, padsize);
+ }

- /* only schedule one TID at a time */
- break;
- } while (!list_empty(&ac->tid_q));
+ ieee80211_tx_status(hw, skb);
+}
+
+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;
+ unsigned long flags;

/*
- * schedule AC if more TIDs need processing
+ * Set retry information.
+ * NB: Don't use the information in the descriptor, because the frame
+ * could be software retried.
*/
- if (!list_empty(&ac->tid_q)) {
+ 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_isxretried(bf))
+ tx_status.flags |= ATH_TX_XRETRY;
+ }
+
+ dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
+ ath_tx_complete(sc, skb, &tx_status);
+
+ /*
+ * 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 int ath_tx_num_badfrms(struct ath_softc *sc, struct ath_buf *bf,
+ int txok)
+{
+ 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 (ds->ds_txstat.ts_flags == ATH9K_TX_SW_ABORTED)
+ return 0;
+
+ isaggr = bf_isaggr(bf);
+ 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_rc_status(struct ath_buf *bf, struct ath_desc *ds, int nbad)
+{
+ struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
+ struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+ struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+
+ tx_info_priv->update_rc = false;
+ 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 (bf_isdata(bf)) {
+ memcpy(&tx_info_priv->tx, &ds->ds_txstat,
+ sizeof(tx_info_priv->tx));
+ tx_info_priv->n_frames = bf->bf_nframes;
+ tx_info_priv->n_bad_frames = nbad;
+ tx_info_priv->update_rc = true;
+ }
+ }
+}
+
+static void 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;
+ int txok, nbad = 0;
+ int status;
+
+ DPRINTF(sc, ATH_DBG_QUEUE, "tx queue %d (%x), link %p\n",
+ txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
+ txq->axq_link);
+
+ 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);
+
/*
- * add dest ac to txq if not already added
+ * 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.
*/
- if (!ac->sched) {
- ac->sched = true;
- list_add_tail(&ac->list, &txq->axq_acq);
+ 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 {
+ bf = list_entry(bf_held->list.next,
+ struct ath_buf, list);
+ }
+ }
+
+ lastbf = bf->bf_lastbf;
+ ds = lastbf->bf_desc;
+
+ 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_isaggr(bf))
+ 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->tx.txbuflock);
+ list_add_tail(&bf_held->list, &sc->tx.txbuf);
+ spin_unlock_bh(&sc->tx.txbuflock);
+ }
+
+ if (!bf_isampdu(bf)) {
+ /*
+ * 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_state.bf_type |= BUF_XRETRY;
+ nbad = 0;
+ } else {
+ nbad = ath_tx_num_badfrms(sc, bf, txok);
+ }
+
+ ath_tx_rc_status(bf, ds, nbad);
+
+ if (bf_isampdu(bf))
+ ath_tx_complete_aggr_rifs(sc, txq, bf, &bf_head, txok);
+ else
+ ath_tx_complete_buf(sc, bf, &bf_head, txok, 0);
+
+ 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;
+ }
+
+ }
+
+ if (sc->sc_flags & SC_OP_TXAGGR)
+ ath_txq_schedule(sc, txq);
+ spin_unlock_bh(&txq->axq_lock);
}
}

-/* Initialize per-node transmit state */
+
+void ath_tx_tasklet(struct ath_softc *sc)
+{
+ int i;
+ u32 qcumask = ((1 << ATH9K_NUM_TX_QUEUES) - 1);
+
+ ath9k_hw_gettxintrtxqs(sc->sc_ah, &qcumask);
+
+ 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]);
+ }
+}
+
+/*****************/
+/* Init, Cleanup */
+/*****************/
+
+int ath_tx_init(struct ath_softc *sc, int nbufs)
+{
+ int error = 0;
+
+ do {
+ spin_lock_init(&sc->tx.txbuflock);
+
+ error = ath_descdma_setup(sc, &sc->tx.txdma, &sc->tx.txbuf,
+ "tx", nbufs, 1);
+ if (error != 0) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "Failed to allocate tx descriptors: %d\n",
+ error);
+ break;
+ }
+
+ error = ath_descdma_setup(sc, &sc->beacon.bdma, &sc->beacon.bbuf,
+ "beacon", ATH_BCBUF, 1);
+ if (error != 0) {
+ DPRINTF(sc, ATH_DBG_FATAL,
+ "Failed to allocate beacon descriptors: %d\n",
+ error);
+ break;
+ }
+
+ } while (0);
+
+ if (error != 0)
+ ath_tx_cleanup(sc);
+
+ return error;
+}
+
+int ath_tx_cleanup(struct ath_softc *sc)
+{
+ if (sc->beacon.bdma.dd_desc_len != 0)
+ ath_descdma_cleanup(sc, &sc->beacon.bdma, &sc->beacon.bbuf);
+
+ if (sc->tx.txdma.dd_desc_len != 0)
+ ath_descdma_cleanup(sc, &sc->tx.txdma, &sc->tx.txbuf);
+
+ return 0;
+}

void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
{
@@ -2412,9 +2232,6 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
struct ath_atx_ac *ac;
int tidno, acno;

- /*
- * Init per tid tx state
- */
for (tidno = 0, tid = &an->tid[tidno];
tidno < WME_NUM_TID;
tidno++, tid++) {
@@ -2424,22 +2241,16 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
tid->baw_size = WME_MAX_BA;
tid->baw_head = tid->baw_tail = 0;
tid->sched = false;
- tid->paused = false;
+ tid->paused = false;
tid->state &= ~AGGR_CLEANUP;
INIT_LIST_HEAD(&tid->buf_q);
-
acno = TID_TO_WME_AC(tidno);
tid->ac = &an->ac[acno];
-
- /* ADDBA state */
tid->state &= ~AGGR_ADDBA_COMPLETE;
tid->state &= ~AGGR_ADDBA_PROGRESS;
tid->addba_exchangeattempts = 0;
}

- /*
- * Init per ac tx state
- */
for (acno = 0, ac = &an->ac[acno];
acno < WME_NUM_AC; acno++, ac++) {
ac->sched = false;
@@ -2466,14 +2277,13 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
}
}

-/* Cleanupthe pending buffers for the node. */
-
void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
{
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->tx.txq[i];
@@ -2504,51 +2314,3 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
}
}
}
-
-void ath_tx_cabq(struct ath_softc *sc, struct sk_buff *skb)
-{
- int hdrlen, padsize;
- struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- struct ath_tx_control txctl;
-
- memset(&txctl, 0, sizeof(struct ath_tx_control));
-
- /*
- * As a temporary workaround, assign seq# here; this will likely need
- * to be cleaned up to work better with Beacon transmission and virtual
- * BSSes.
- */
- if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
- sc->tx.seq_no += 0x10;
- hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
- hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
- }
-
- /* Add the padding after the header if this is not already done */
- hdrlen = ieee80211_get_hdrlen_from_skb(skb);
- if (hdrlen & 3) {
- padsize = hdrlen % 4;
- if (skb_headroom(skb) < padsize) {
- DPRINTF(sc, ATH_DBG_XMIT, "TX CABQ padding failed\n");
- dev_kfree_skb_any(skb);
- return;
- }
- skb_push(skb, padsize);
- memmove(skb->data, skb->data + padsize, hdrlen);
- }
-
- txctl.txq = sc->beacon.cabq;
-
- DPRINTF(sc, ATH_DBG_XMIT, "transmitting CABQ packet, skb: %p\n", skb);
-
- if (ath_tx_start(sc, skb, &txctl) != 0) {
- DPRINTF(sc, ATH_DBG_XMIT, "CABQ TX failed\n");
- goto exit;
- }
-
- return;
-exit:
- dev_kfree_skb_any(skb);
-}
--
1.6.0.3