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net: fec: Factorize the .xmit transmit function

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Make the code more readable and easy to support other features like
SG, TSO, moving the common transmit function to one api.

And the patch also factorize the getting BD index to it own function.

CC: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nimrod Andy 2014-06-12 08:16:18 +08:00 committed by David S. Miller
parent 3993c4e159
commit 61a4427b95
2 changed files with 47 additions and 35 deletions
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1
drivers/net/ethernet/freescale/fec.h
View File

@ -296,6 +296,7 @@ struct fec_enet_private {
/* The ring entries to be free()ed */
struct bufdesc *dirty_tx;
unsigned short bufdesc_size;
unsigned short tx_ring_size;
unsigned short rx_ring_size;

81
drivers/net/ethernet/freescale/fec_main.c
View File

@ -287,6 +287,12 @@ struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, struct fec_enet_priva
return (new_bd < base) ? (new_bd + ring_size) : new_bd;
}
static int fec_enet_get_bd_index(struct bufdesc *base, struct bufdesc *bdp,
struct fec_enet_private *fep)
{
return ((const char *)bdp - (const char *)base) / fep->bufdesc_size;
}
static void *swap_buffer(void *bufaddr, int len)
{
int i;
@ -313,8 +319,7 @@ fec_enet_clear_csum(struct sk_buff *skb, struct net_device *ndev)
return 0;
}
static netdev_tx_t
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
static int txq_submit_skb(struct sk_buff *skb, struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
const struct platform_device_id *id_entry =
@ -329,14 +334,6 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
status = bdp->cbd_sc;
if (status & BD_ENET_TX_READY) {
/* Ooops. All transmit buffers are full. Bail out.
* This should not happen, since ndev->tbusy should be set.
*/
netdev_err(ndev, "tx queue full!\n");
return NETDEV_TX_BUSY;
}
/* Protocol checksum off-load for TCP and UDP. */
if (fec_enet_clear_csum(skb, ndev)) {
dev_kfree_skb_any(skb);
@ -350,16 +347,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
bufaddr = skb->data;
bdp->cbd_datlen = skb->len;
/*
* On some FEC implementations data must be aligned on
* 4-byte boundaries. Use bounce buffers to copy data
* and get it aligned. Ugh.
*/
if (fep->bufdesc_ex)
index = (struct bufdesc_ex *)bdp -
(struct bufdesc_ex *)fep->tx_bd_base;
else
index = bdp - fep->tx_bd_base;
index = fec_enet_get_bd_index(fep->tx_bd_base, bdp, fep);
if (((unsigned long) bufaddr) & FEC_ALIGNMENT) {
memcpy(fep->tx_bounce[index], skb->data, skb->len);
@ -433,15 +421,43 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
fep->cur_tx = bdp;
if (fep->cur_tx == fep->dirty_tx)
netif_stop_queue(ndev);
/* Trigger transmission start */
writel(0, fep->hwp + FEC_X_DES_ACTIVE);
return NETDEV_TX_OK;
}
static netdev_tx_t
fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct fec_enet_private *fep = netdev_priv(ndev);
struct bufdesc *bdp;
unsigned short status;
int ret;
/* Fill in a Tx ring entry */
bdp = fep->cur_tx;
status = bdp->cbd_sc;
if (status & BD_ENET_TX_READY) {
/* Ooops. All transmit buffers are full. Bail out.
* This should not happen, since ndev->tbusy should be set.
*/
netdev_err(ndev, "tx queue full!\n");
return NETDEV_TX_BUSY;
}
ret = txq_submit_skb(skb, ndev);
if (ret == -EBUSY)
return NETDEV_TX_BUSY;
if (fep->cur_tx == fep->dirty_tx)
netif_stop_queue(ndev);
return NETDEV_TX_OK;
}
/* Init RX & TX buffer descriptors
*/
static void fec_enet_bd_init(struct net_device *dev)
@ -770,11 +786,7 @@ fec_enet_tx(struct net_device *ndev)
if (bdp == fep->cur_tx)
break;
if (fep->bufdesc_ex)
index = (struct bufdesc_ex *)bdp -
(struct bufdesc_ex *)fep->tx_bd_base;
else
index = bdp - fep->tx_bd_base;
index = fec_enet_get_bd_index(fep->tx_bd_base, bdp, fep);
skb = fep->tx_skbuff[index];
dma_unmap_single(&fep->pdev->dev, bdp->cbd_bufaddr, skb->len,
@ -921,11 +933,7 @@ fec_enet_rx(struct net_device *ndev, int budget)
pkt_len = bdp->cbd_datlen;
ndev->stats.rx_bytes += pkt_len;
if (fep->bufdesc_ex)
index = (struct bufdesc_ex *)bdp -
(struct bufdesc_ex *)fep->rx_bd_base;
else
index = bdp - fep->rx_bd_base;
index = fec_enet_get_bd_index(fep->rx_bd_base, bdp, fep);
data = fep->rx_skbuff[index]->data;
dma_sync_single_for_cpu(&fep->pdev->dev, bdp->cbd_bufaddr,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
@ -2061,11 +2069,14 @@ static int fec_enet_init(struct net_device *ndev)
/* Set receive and transmit descriptor base. */
fep->rx_bd_base = cbd_base;
if (fep->bufdesc_ex)
if (fep->bufdesc_ex) {
fep->tx_bd_base = (struct bufdesc *)
(((struct bufdesc_ex *)cbd_base) + fep->rx_ring_size);
else
fep->bufdesc_size = sizeof(struct bufdesc_ex);
} else {
fep->tx_bd_base = cbd_base + fep->rx_ring_size;
fep->bufdesc_size = sizeof(struct bufdesc);
}
/* The FEC Ethernet specific entries in the device structure */
ndev->watchdog_timeo = TX_TIMEOUT;