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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-06-04 13:25:38 -0700 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2007-07-08 22:16:40 -0400 |
| commit | f65a71775cc3eb5d5d8ac4c349c8f48a7d5c7759 (patch) | |
| tree | 7733077740f8af58631f478998a6fd3fa9a0a1e7 /drivers/net/b44.c | |
| parent | a72a8179734393ca351f6ecf8cad6841ab7e1470 (diff) | |
| download | op-kernel-dev-f65a71775cc3eb5d5d8ac4c349c8f48a7d5c7759.zip op-kernel-dev-f65a71775cc3eb5d5d8ac4c349c8f48a7d5c7759.tar.gz | |
b44: tx bounce sizing.
No need to grap full size MTU buffer for possibly small transmit
bounce buffers.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/b44.c')
| -rw-r--r-- | drivers/net/b44.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/net/b44.c b/drivers/net/b44.c index e87bab9..d10d31c 100644 --- a/drivers/net/b44.c +++ b/drivers/net/b44.c @@ -69,7 +69,6 @@ #define NEXT_TX(N) (((N) + 1) & (B44_TX_RING_SIZE - 1)) #define RX_PKT_BUF_SZ (1536 + bp->rx_offset + 64) -#define TX_PKT_BUF_SZ (B44_MAX_MTU + ETH_HLEN + 8) /* minimum number of free TX descriptors required to wake up TX process */ #define B44_TX_WAKEUP_THRESH (B44_TX_RING_SIZE / 4) @@ -968,7 +967,6 @@ static void b44_tx_timeout(struct net_device *dev) static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct b44 *bp = netdev_priv(dev); - struct sk_buff *bounce_skb; int rc = NETDEV_TX_OK; dma_addr_t mapping; u32 len, entry, ctrl; @@ -986,12 +984,13 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev) mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE); if (dma_mapping_error(mapping) || mapping + len > DMA_30BIT_MASK) { + struct sk_buff *bounce_skb; + /* Chip can't handle DMA to/from >1GB, use bounce buffer */ if (!dma_mapping_error(mapping)) pci_unmap_single(bp->pdev, mapping, len, PCI_DMA_TODEVICE); - bounce_skb = __dev_alloc_skb(TX_PKT_BUF_SZ, - GFP_ATOMIC|GFP_DMA); + bounce_skb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA); if (!bounce_skb) goto err_out; @@ -1000,13 +999,12 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev) if (dma_mapping_error(mapping) || mapping + len > DMA_30BIT_MASK) { if (!dma_mapping_error(mapping)) pci_unmap_single(bp->pdev, mapping, - len, PCI_DMA_TODEVICE); + len, PCI_DMA_TODEVICE); dev_kfree_skb_any(bounce_skb); goto err_out; } - skb_copy_from_linear_data(skb, skb_put(bounce_skb, len), - skb->len); + skb_copy_from_linear_data(skb, skb_put(bounce_skb, len), len); dev_kfree_skb_any(skb); skb = bounce_skb; } |
