diff options
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/faraday/ftgmac100.c | 59 |
1 files changed, 16 insertions, 43 deletions
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index 6325e326147d..b4d84e753187 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -65,6 +65,7 @@ struct ftgmac100 { u32 rxdes0_edorr_mask; /* Tx ring */ + struct sk_buff *tx_skbs[TX_QUEUE_ENTRIES]; unsigned int tx_clean_pointer; unsigned int tx_pointer; unsigned int tx_pending; @@ -545,63 +546,29 @@ static dma_addr_t ftgmac100_txdes_get_dma_addr(struct ftgmac100_txdes *txdes) return le32_to_cpu(txdes->txdes3); } -/* - * txdes2 is not used by hardware. We use it to keep track of socket buffer. - * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). - */ -static void ftgmac100_txdes_set_skb(struct ftgmac100_txdes *txdes, - struct sk_buff *skb) -{ - txdes->txdes2 = (unsigned int)skb; -} - -static struct sk_buff *ftgmac100_txdes_get_skb(struct ftgmac100_txdes *txdes) -{ - return (struct sk_buff *)txdes->txdes2; -} - static int ftgmac100_next_tx_pointer(int pointer) { return (pointer + 1) & (TX_QUEUE_ENTRIES - 1); } -static void ftgmac100_tx_pointer_advance(struct ftgmac100 *priv) -{ - priv->tx_pointer = ftgmac100_next_tx_pointer(priv->tx_pointer); -} - -static void ftgmac100_tx_clean_pointer_advance(struct ftgmac100 *priv) -{ - priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv->tx_clean_pointer); -} - -static struct ftgmac100_txdes *ftgmac100_current_txdes(struct ftgmac100 *priv) -{ - return &priv->descs->txdes[priv->tx_pointer]; -} - -static struct ftgmac100_txdes * -ftgmac100_current_clean_txdes(struct ftgmac100 *priv) -{ - return &priv->descs->txdes[priv->tx_clean_pointer]; -} - static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv) { struct net_device *netdev = priv->netdev; struct ftgmac100_txdes *txdes; + unsigned int pointer; struct sk_buff *skb; dma_addr_t map; if (priv->tx_pending == 0) return false; - txdes = ftgmac100_current_clean_txdes(priv); + pointer = priv->tx_clean_pointer; + txdes = &priv->descs->txdes[pointer]; if (ftgmac100_txdes_owned_by_dma(txdes)) return false; - skb = ftgmac100_txdes_get_skb(txdes); + skb = priv->tx_skbs[pointer]; map = ftgmac100_txdes_get_dma_addr(txdes); netdev->stats.tx_packets++; @@ -610,10 +577,11 @@ static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv) dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); dev_kfree_skb(skb); + priv->tx_skbs[pointer] = NULL; ftgmac100_txdes_reset(priv, txdes); - ftgmac100_tx_clean_pointer_advance(priv); + priv->tx_clean_pointer = ftgmac100_next_tx_pointer(pointer); spin_lock(&priv->tx_lock); priv->tx_pending--; @@ -634,6 +602,7 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb, { struct ftgmac100 *priv = netdev_priv(netdev); struct ftgmac100_txdes *txdes; + unsigned int pointer; dma_addr_t map; /* The HW doesn't pad small frames */ @@ -657,11 +626,12 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb, goto drop; } - txdes = ftgmac100_current_txdes(priv); - ftgmac100_tx_pointer_advance(priv); + /* Grab the next free tx descriptor */ + pointer = priv->tx_pointer; + txdes = &priv->descs->txdes[pointer]; /* setup TX descriptor */ - ftgmac100_txdes_set_skb(txdes, skb); + priv->tx_skbs[pointer] = skb; ftgmac100_txdes_set_dma_addr(txdes, map); ftgmac100_txdes_set_buffer_size(txdes, skb->len); @@ -682,6 +652,9 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb, } } + /* Update next TX pointer */ + priv->tx_pointer = ftgmac100_next_tx_pointer(pointer); + spin_lock(&priv->tx_lock); priv->tx_pending++; if (priv->tx_pending == TX_QUEUE_ENTRIES) @@ -724,7 +697,7 @@ static void ftgmac100_free_buffers(struct ftgmac100 *priv) /* Free all TX buffers */ for (i = 0; i < TX_QUEUE_ENTRIES; i++) { struct ftgmac100_txdes *txdes = &priv->descs->txdes[i]; - struct sk_buff *skb = ftgmac100_txdes_get_skb(txdes); + struct sk_buff *skb = priv->tx_skbs[i]; dma_addr_t map = ftgmac100_txdes_get_dma_addr(txdes); if (!skb) |