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sfc: Reduce the size of struct efx_tx_buffer 

Remove unmap_addr since it can be calculated from dma_addr, len and
unmap_len.  This saves 4-16 bytes.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Ben Hutchings 2008-09-01 12:46:43 +01:00 committed by Jeff Garzik
parent ecbd95c17c
commit cc12dac2e5
2 changed files with 11 additions and 11 deletions
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2
drivers/net/sfc/net_driver.h
View File

@ -130,7 +130,6 @@ struct efx_special_buffer {
* This field is zero when the queue slot is empty.
* @continuation: True if this fragment is not the end of a packet.
* @unmap_single: True if pci_unmap_single should be used.
* @unmap_addr: DMA address to unmap
* @unmap_len: Length of this fragment to unmap
*/
struct efx_tx_buffer {
@ -140,7 +139,6 @@ struct efx_tx_buffer {
unsigned short len;
unsigned char continuation;
unsigned char unmap_single;
dma_addr_t unmap_addr;
unsigned short unmap_len;
};

20
drivers/net/sfc/tx.c
View File

@ -64,12 +64,14 @@ static inline void efx_dequeue_buffer(struct efx_tx_queue *tx_queue,
{
if (buffer->unmap_len) {
struct pci_dev *pci_dev = tx_queue->efx->pci_dev;
dma_addr_t unmap_addr = (buffer->dma_addr + buffer->len -
buffer->unmap_len);
if (buffer->unmap_single)
pci_unmap_single(pci_dev, buffer->unmap_addr,
buffer->unmap_len, PCI_DMA_TODEVICE);
pci_unmap_single(pci_dev, unmap_addr, buffer->unmap_len,
PCI_DMA_TODEVICE);
else
pci_unmap_page(pci_dev, buffer->unmap_addr,
buffer->unmap_len, PCI_DMA_TODEVICE);
pci_unmap_page(pci_dev, unmap_addr, buffer->unmap_len,
PCI_DMA_TODEVICE);
buffer->unmap_len = 0;
buffer->unmap_single = 0;
}
@ -233,7 +235,6 @@ static inline int efx_enqueue_skb(struct efx_tx_queue *tx_queue,
} while (len);
/* Transfer ownership of the unmapping to the final buffer */
buffer->unmap_addr = unmap_addr;
buffer->unmap_single = unmap_single;
buffer->unmap_len = unmap_len;
unmap_len = 0;
@ -805,6 +806,7 @@ static inline void efx_tso_put_header(struct efx_tx_queue *tx_queue,
static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
{
struct efx_tx_buffer *buffer;
dma_addr_t unmap_addr;
/* Work backwards until we hit the original insert pointer value */
while (tx_queue->insert_count != tx_queue->write_count) {
@ -816,15 +818,15 @@ static void efx_enqueue_unwind(struct efx_tx_queue *tx_queue)
buffer->len = 0;
buffer->continuation = 1;
if (buffer->unmap_len) {
unmap_addr = (buffer->dma_addr + buffer->len -
buffer->unmap_len);
if (buffer->unmap_single)
pci_unmap_single(tx_queue->efx->pci_dev,
buffer->unmap_addr,
buffer->unmap_len,
unmap_addr, buffer->unmap_len,
PCI_DMA_TODEVICE);
else
pci_unmap_page(tx_queue->efx->pci_dev,
buffer->unmap_addr,
buffer->unmap_len,
unmap_addr, buffer->unmap_len,
PCI_DMA_TODEVICE);
buffer->unmap_len = 0;
}