ath9k: get rid of tx_info_priv

This patch removes the need for separately allocated private tx info
data in ath9k and brings the driver one small step closer to using the
mac80211 rate control API properly.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 32 insertions, 38 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 86b54ddd01c..2db0fa878c2 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -251,6 +251,7 @@ static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
 
 	ATH_TXBUF_RESET(tbf);
 
+	tbf->aphy = bf->aphy;
 	tbf->bf_mpdu = bf->bf_mpdu;
 	tbf->bf_buf_addr = bf->bf_buf_addr;
 	*(tbf->bf_desc) = *(bf->bf_desc);
@@ -270,7 +271,6 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
 	struct ieee80211_hw *hw;
 	struct ieee80211_hdr *hdr;
 	struct ieee80211_tx_info *tx_info;
-	struct ath_tx_info_priv *tx_info_priv;
 	struct ath_atx_tid *tid = NULL;
 	struct ath_buf *bf_next, *bf_last = bf->bf_lastbf;
 	struct ath_desc *ds = bf_last->bf_desc;
@@ -284,8 +284,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
 	hdr = (struct ieee80211_hdr *)skb->data;
 
 	tx_info = IEEE80211_SKB_CB(skb);
-	tx_info_priv = (struct ath_tx_info_priv *) tx_info->rate_driver_data[0];
-	hw = tx_info_priv->aphy->hw;
+	hw = bf->aphy->hw;
 
 	rcu_read_lock();
 
@@ -464,7 +463,6 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
 	struct sk_buff *skb;
 	struct ieee80211_tx_info *tx_info;
 	struct ieee80211_tx_rate *rates;
-	struct ath_tx_info_priv *tx_info_priv;
 	u32 max_4ms_framelen, frmlen;
 	u16 aggr_limit, legacy = 0;
 	int i;
@@ -472,7 +470,6 @@ static u32 ath_lookup_rate(struct ath_softc *sc, struct ath_buf *bf,
 	skb = bf->bf_mpdu;
 	tx_info = IEEE80211_SKB_CB(skb);
 	rates = tx_info->control.rates;
-	tx_info_priv = (struct ath_tx_info_priv *)tx_info->rate_driver_data[0];
 
 	/*
 	 * Find the lowest frame length among the rate series that will have a
@@ -1560,21 +1557,26 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
 	struct ath_softc *sc = aphy->sc;
 	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;
-	tx_info_priv->aphy = aphy;
-	tx_info_priv->frame_type = txctl->frame_type;
+	tx_info->pad[0] = 0;
+	switch (txctl->frame_type) {
+	case ATH9K_NOT_INTERNAL:
+		break;
+	case ATH9K_INT_PAUSE:
+		tx_info->pad[0] |= ATH_TX_INFO_FRAME_TYPE_PAUSE;
+		/* fall through */
+	case ATH9K_INT_UNPAUSE:
+		tx_info->pad[0] |= ATH_TX_INFO_FRAME_TYPE_INTERNAL;
+		break;
+	}
 	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 	fc = hdr->frame_control;
 
 	ATH_TXBUF_RESET(bf);
 
+	bf->aphy = aphy;
 	bf->bf_frmlen = skb->len + FCS_LEN - (hdrlen & 3);
 
 	if (conf_is_ht(&hw->conf) && !is_pae(skb))
@@ -1599,8 +1601,6 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
 					   skb->len, DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) {
 		bf->bf_mpdu = NULL;
-		kfree(tx_info_priv);
-		tx_info->rate_driver_data[0] = NULL;
 		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
 			  "dma_mapping_error() on TX\n");
 		return -ENOMEM;
@@ -1781,27 +1781,17 @@ exit:
 /*****************/
 
 static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
-			    int tx_flags)
+			    struct ath_wiphy *aphy, int tx_flags)
 {
 	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);
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	int hdrlen, padsize;
-	int frame_type = ATH9K_NOT_INTERNAL;
 
 	ath_print(common, ATH_DBG_XMIT, "TX complete: skb: %p\n", skb);
 
-	if (tx_info_priv) {
-		hw = tx_info_priv->aphy->hw;
-		frame_type = tx_info_priv->frame_type;
-	}
-
-	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 (aphy)
+		hw = aphy->hw;
 
 	if (tx_flags & ATH_TX_BAR)
 		tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
@@ -1833,10 +1823,10 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
 					SC_OP_WAIT_FOR_TX_ACK));
 	}
 
-	if (frame_type == ATH9K_NOT_INTERNAL)
-		ieee80211_tx_status(hw, skb);
-	else
+	if (unlikely(tx_info->pad[0] & ATH_TX_INFO_FRAME_TYPE_INTERNAL))
 		ath9k_tx_status(hw, skb);
+	else
+		ieee80211_tx_status(hw, skb);
 }
 
 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
@@ -1859,7 +1849,7 @@ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
 	}
 
 	dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
-	ath_tx_complete(sc, skb, tx_flags);
+	ath_tx_complete(sc, skb, bf->aphy, tx_flags);
 	ath_debug_stat_tx(sc, txq, bf);
 
 	/*
@@ -1907,8 +1897,7 @@ static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds,
 	struct sk_buff *skb = bf->bf_mpdu;
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
-	struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
-	struct ieee80211_hw *hw = tx_info_priv->aphy->hw;
+	struct ieee80211_hw *hw = bf->aphy->hw;
 	u8 i, tx_rateindex;
 
 	if (txok)
@@ -1917,17 +1906,22 @@ static void ath_tx_rc_status(struct ath_buf *bf, struct ath_desc *ds,
 	tx_rateindex = ds->ds_txstat.ts_rateindex;
 	WARN_ON(tx_rateindex >= hw->max_rates);
 
-	tx_info_priv->update_rc = update_rc;
+	if (update_rc)
+		tx_info->pad[0] |= ATH_TX_INFO_UPDATE_RC;
 	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 && update_rc) {
 		if (ieee80211_is_data(hdr->frame_control)) {
-			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;
+			if (ds->ds_txstat.ts_flags &
+			    (ATH9K_TX_DATA_UNDERRUN | ATH9K_TX_DELIM_UNDERRUN))
+				tx_info->pad[0] |= ATH_TX_INFO_UNDERRUN;
+			if ((ds->ds_txstat.ts_status & ATH9K_TXERR_XRETRY) ||
+			    (ds->ds_txstat.ts_status & ATH9K_TXERR_FIFO))
+				tx_info->pad[0] |= ATH_TX_INFO_XRETRY;
+			tx_info->status.ampdu_len = bf->bf_nframes;
+			tx_info->status.ampdu_ack_len = bf->bf_nframes - nbad;
 		}
 	}