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wifipineapple-openwrt
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wifipineapple-openwrt/package/mac80211/patches/544-ath9k_defer_buffer_setu...

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--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -48,8 +48,9 @@ static u16 bits_per_symbol[][2] = {
#define IS_HT_RATE(_rate) ((_rate) & 0x80)
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_atx_tid *tid, struct sk_buff *skb);
+static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
+ int tx_flags, struct ath_txq *txq);
static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
struct ath_txq *txq, struct list_head *bf_q,
struct ath_tx_status *ts, int txok, int sendbar);
@@ -61,6 +62,10 @@ static void ath_tx_rc_status(struct ath_
int txok, bool update_rc);
static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
int seqno);
+static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
+ struct ath_txq *txq,
+ struct ath_atx_tid *tid,
+ struct sk_buff *skb);
enum {
MCS_HT20,
@@ -164,14 +169,13 @@ static void ath_tx_flush_tid(struct ath_
fi = get_frame_info(skb);
bf = fi->bf;
- list_add_tail(&bf->list, &bf_head);
-
spin_unlock_bh(&txq->axq_lock);
- if (fi->retries) {
+ if (bf && fi->retries) {
+ list_add_tail(&bf->list, &bf_head);
ath_tx_update_baw(sc, tid, bf->bf_state.seqno);
ath_tx_complete_buf(sc, bf, txq, &bf_head, &ts, 0, 1);
} else {
- ath_tx_send_normal(sc, txq, NULL, &bf_head);
+ ath_tx_send_normal(sc, txq, NULL, skb);
}
spin_lock_bh(&txq->axq_lock);
}
@@ -234,6 +238,13 @@ static void ath_tid_drain(struct ath_sof
fi = get_frame_info(skb);
bf = fi->bf;
+ if (!bf) {
+ spin_unlock(&txq->axq_lock);
+ ath_tx_complete(sc, skb, ATH_TX_ERROR, txq);
+ spin_lock(&txq->axq_lock);
+ continue;
+ }
+
list_add_tail(&bf->list, &bf_head);
if (fi->retries)
@@ -760,8 +771,14 @@ static enum ATH_AGGR_STATUS ath_tx_form_
skb = skb_peek(&tid->buf_q);
fi = get_frame_info(skb);
bf = fi->bf;
- seqno = bf->bf_state.seqno;
+ if (!fi->bf)
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+ if (!bf)
+ continue;
+
+ bf->bf_state.bf_type |= BUF_AMPDU;
+ seqno = bf->bf_state.seqno;
if (!bf_first)
bf_first = bf;
@@ -1434,13 +1451,11 @@ static void ath_tx_txqaddbuf(struct ath_
}
static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
- struct ath_buf *bf, struct ath_tx_control *txctl)
+ struct sk_buff *skb, struct ath_tx_control *txctl)
{
- struct ath_frame_info *fi = get_frame_info(bf->bf_mpdu);
+ struct ath_frame_info *fi = get_frame_info(skb);
struct list_head bf_head;
- u16 seqno = bf->bf_state.seqno;
-
- bf->bf_state.bf_type |= BUF_AMPDU;
+ struct ath_buf *bf;
/*
* Do not queue to h/w when any of the following conditions is true:
@@ -1450,25 +1465,29 @@ static void ath_tx_send_ampdu(struct ath
* - h/w queue depth exceeds low water mark
*/
if (!skb_queue_empty(&tid->buf_q) || tid->paused ||
- !BAW_WITHIN(tid->seq_start, tid->baw_size, seqno) ||
+ !BAW_WITHIN(tid->seq_start, tid->baw_size, tid->seq_next) ||
txctl->txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) {
/*
* Add this frame to software queue for scheduling later
* for aggregation.
*/
TX_STAT_INC(txctl->txq->axq_qnum, a_queued_sw);
- __skb_queue_tail(&tid->buf_q, bf->bf_mpdu);
+ __skb_queue_tail(&tid->buf_q, skb);
if (!txctl->an || !txctl->an->sleeping)
ath_tx_queue_tid(txctl->txq, tid);
return;
}
+ bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
+ if (!bf)
+ return;
+
+ bf->bf_state.bf_type |= BUF_AMPDU;
INIT_LIST_HEAD(&bf_head);
list_add(&bf->list, &bf_head);
/* Add sub-frame to BAW */
- if (!fi->retries)
- ath_tx_addto_baw(sc, tid, seqno);
+ ath_tx_addto_baw(sc, tid, bf->bf_state.seqno);
/* Queue to h/w without aggregation */
TX_STAT_INC(txctl->txq->axq_qnum, a_queued_hw);
@@ -1478,13 +1497,21 @@ static void ath_tx_send_ampdu(struct ath
}
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_atx_tid *tid, struct sk_buff *skb)
{
- struct ath_frame_info *fi;
+ struct ath_frame_info *fi = get_frame_info(skb);
+ struct list_head bf_head;
struct ath_buf *bf;
- bf = list_first_entry(bf_head, struct ath_buf, list);
+ bf = fi->bf;
+ if (!bf)
+ bf = ath_tx_setup_buffer(sc, txq, tid, skb);
+
+ if (!bf)
+ return;
+
+ INIT_LIST_HEAD(&bf_head);
+ list_add_tail(&bf->list, &bf_head);
bf->bf_state.bf_type &= ~BUF_AMPDU;
/* update starting sequence number for subsequent ADDBA request */
@@ -1492,9 +1519,8 @@ static void ath_tx_send_normal(struct at
INCR(tid->seq_start, IEEE80211_SEQ_MAX);
bf->bf_lastbf = bf;
- fi = get_frame_info(bf->bf_mpdu);
ath_buf_set_rate(sc, bf, fi->framelen);
- ath_tx_txqaddbuf(sc, txq, bf_head, false);
+ ath_tx_txqaddbuf(sc, txq, &bf_head, false);
TX_STAT_INC(txq->axq_qnum, queued);
}
@@ -1717,6 +1743,10 @@ static void ath_buf_set_rate(struct ath_
}
+/*
+ * Assign a descriptor (and sequence number if necessary,
+ * and map buffer for DMA. Frees skb on error
+ */
static struct ath_buf *ath_tx_setup_buffer(struct ath_softc *sc,
struct ath_txq *txq,
struct ath_atx_tid *tid,
@@ -1734,7 +1764,7 @@ static struct ath_buf *ath_tx_setup_buff
bf = ath_tx_get_buffer(sc);
if (!bf) {
ath_dbg(common, ATH_DBG_XMIT, "TX buffers are full\n");
- return NULL;
+ goto error;
}
ATH_TXBUF_RESET(bf);
@@ -1757,7 +1787,7 @@ static struct ath_buf *ath_tx_setup_buff
ath_err(ath9k_hw_common(sc->sc_ah),
"dma_mapping_error() on TX\n");
ath_tx_return_buffer(sc, bf);
- return NULL;
+ goto error;
}
frm_type = get_hw_packet_type(skb);
@@ -1779,18 +1809,20 @@ static struct ath_buf *ath_tx_setup_buff
fi->bf = bf;
return bf;
+
+error:
+ dev_kfree_skb_any(skb);
+ return NULL;
}
/* FIXME: tx power */
-static int ath_tx_start_dma(struct ath_softc *sc, struct sk_buff *skb,
+static void ath_tx_start_dma(struct ath_softc *sc, 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 list_head bf_head;
struct ath_atx_tid *tid = NULL;
struct ath_buf *bf;
- int ret = 0;
u8 tidno;
spin_lock_bh(&txctl->txq->axq_lock);
@@ -1803,21 +1835,16 @@ static int ath_tx_start_dma(struct ath_s
WARN_ON(tid->ac->txq != txctl->txq);
}
- bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
- if (unlikely(!bf)) {
- ret = -ENOMEM;
- goto out;
- }
-
if ((tx_info->flags & IEEE80211_TX_CTL_AMPDU) && tid) {
/*
* Try aggregation if it's a unicast data frame
* and the destination is HT capable.
*/
- ath_tx_send_ampdu(sc, tid, bf, txctl);
+ ath_tx_send_ampdu(sc, tid, skb, txctl);
} else {
- INIT_LIST_HEAD(&bf_head);
- list_add_tail(&bf->list, &bf_head);
+ bf = ath_tx_setup_buffer(sc, txctl->txq, tid, skb);
+ if (!bf)
+ goto out;
bf->bf_state.bfs_paprd = txctl->paprd;
@@ -1831,12 +1858,11 @@ static int ath_tx_start_dma(struct ath_s
if (tx_info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
ath9k_hw_set_clrdmask(sc->sc_ah, bf->bf_desc, true);
- ath_tx_send_normal(sc, txctl->txq, tid, &bf_head);
+ ath_tx_send_normal(sc, txctl->txq, tid, skb);
}
out:
spin_unlock_bh(&txctl->txq->axq_lock);
- return ret;
}
/* Upon failure caller should free skb */
@@ -1904,7 +1930,8 @@ int ath_tx_start(struct ieee80211_hw *hw
}
spin_unlock_bh(&txq->axq_lock);
- return ath_tx_start_dma(sc, skb, txctl);
+ ath_tx_start_dma(sc, skb, txctl);
+ return 0;
}
/*****************/
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