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FEC Buffer rework

Browse source 
Allocate buffers in fec_open and free them again in fec_close. This makes
it possible to use this driver as a module.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sascha Hauer 2009-04-15 01:32:24 +00:00 committed by David S. Miller
parent 009fda83ee
commit f0b3fbeae1
1 changed files with 88 additions and 51 deletions
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139
drivers/net/fec.c
View file

@ -172,6 +172,7 @@ struct fec_enet_private {
/* The saved address of a sent-in-place packet/buffer, for skfree(). */
unsigned char *tx_bounce[TX_RING_SIZE];
struct sk_buff* tx_skbuff[TX_RING_SIZE];
struct sk_buff* rx_skbuff[RX_RING_SIZE];
ushort skb_cur;
ushort skb_dirty;
@ -335,8 +336,8 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Push the data cache so the CPM does not get stale memory
* data.
*/
dma_sync_single(NULL, bdp->cbd_bufaddr,
bdp->cbd_datlen, DMA_TO_DEVICE);
bdp->cbd_bufaddr = dma_map_single(&dev->dev, skb->data,
FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
/* Send it on its way. Tell FEC it's ready, interrupt when done,
* it's the last BD of the frame, and to put the CRC on the end.
@ -429,7 +430,11 @@ fec_enet_tx(struct net_device *dev)
bdp = fep->dirty_tx;
while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
if (bdp == fep->cur_tx && fep->tx_full == 0) break;
if (bdp == fep->cur_tx && fep->tx_full == 0)
break;
dma_unmap_single(&dev->dev, bdp->cbd_bufaddr, FEC_ENET_TX_FRSIZE, DMA_TO_DEVICE);
bdp->cbd_bufaddr = 0;
skb = fep->tx_skbuff[fep->skb_dirty];
/* Check for errors. */
@ -553,8 +558,8 @@ fec_enet_rx(struct net_device *dev)
dev->stats.rx_bytes += pkt_len;
data = (__u8*)__va(bdp->cbd_bufaddr);
dma_sync_single(NULL, (unsigned long)__pa(data),
pkt_len - 4, DMA_FROM_DEVICE);
dma_unmap_single(NULL, bdp->cbd_bufaddr, bdp->cbd_datlen,
DMA_FROM_DEVICE);
/* This does 16 byte alignment, exactly what we need.
* The packet length includes FCS, but we don't want to
@ -574,6 +579,9 @@ fec_enet_rx(struct net_device *dev)
skb->protocol = eth_type_trans(skb, dev);
netif_rx(skb);
}
bdp->cbd_bufaddr = dma_map_single(NULL, data, bdp->cbd_datlen,
DMA_FROM_DEVICE);
rx_processing_done:
/* Clear the status flags for this buffer */
status &= ~BD_ENET_RX_STATS;
@ -1398,15 +1406,86 @@ mii_link_interrupt(int irq, void * dev_id)
}
#endif
static void fec_enet_free_buffers(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
struct sk_buff *skb;
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
skb = fep->rx_skbuff[i];
if (bdp->cbd_bufaddr)
dma_unmap_single(&dev->dev, bdp->cbd_bufaddr,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
if (skb)
dev_kfree_skb(skb);
bdp++;
}
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++)
kfree(fep->tx_bounce[i]);
}
static int fec_enet_alloc_buffers(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int i;
struct sk_buff *skb;
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
skb = dev_alloc_skb(FEC_ENET_RX_FRSIZE);
if (!skb) {
fec_enet_free_buffers(dev);
return -ENOMEM;
}
fep->rx_skbuff[i] = skb;
bdp->cbd_bufaddr = dma_map_single(&dev->dev, skb->data,
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
bdp->cbd_sc = BD_ENET_RX_EMPTY;
bdp++;
}
/* Set the last buffer to wrap. */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++) {
fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp++;
}
/* Set the last buffer to wrap. */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
return 0;
}
static int
fec_enet_open(struct net_device *dev)
{
struct fec_enet_private *fep = netdev_priv(dev);
int ret;
/* I should reset the ring buffers here, but I don't yet know
* a simple way to do that.
*/
ret = fec_enet_alloc_buffers(dev);
if (ret)
return ret;
fep->sequence_done = 0;
fep->link = 0;
@ -1453,6 +1532,8 @@ fec_enet_close(struct net_device *dev)
netif_stop_queue(dev);
fec_stop(dev);
fec_enet_free_buffers(dev);
return 0;
}
@ -1575,9 +1656,8 @@ static const struct net_device_ops fec_netdev_ops = {
int __init fec_enet_init(struct net_device *dev, int index)
{
struct fec_enet_private *fep = netdev_priv(dev);
unsigned long mem_addr;
struct bufdesc *bdp, *cbd_base;
int i, j;
struct bufdesc *cbd_base;
int i;
/* Allocate memory for buffer descriptors. */
cbd_base = dma_alloc_coherent(NULL, PAGE_SIZE, &fep->bd_dma,
@ -1615,49 +1695,6 @@ int __init fec_enet_init(struct net_device *dev, int index)
fep->rx_bd_base = cbd_base;
fep->tx_bd_base = cbd_base + RX_RING_SIZE;
/* Initialize the receive buffer descriptors. */
bdp = fep->rx_bd_base;
for (i=0; i<FEC_ENET_RX_PAGES; i++) {
/* Allocate a page */
mem_addr = __get_free_page(GFP_KERNEL);
/* XXX: missing check for allocation failure */
/* Initialize the BD for every fragment in the page */
for (j=0; j<FEC_ENET_RX_FRPPG; j++) {
bdp->cbd_sc = BD_ENET_RX_EMPTY;
bdp->cbd_bufaddr = __pa(mem_addr);
mem_addr += FEC_ENET_RX_FRSIZE;
bdp++;
}
}
/* Set the last buffer to wrap */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
/* ...and the same for transmit */
bdp = fep->tx_bd_base;
for (i=0, j=FEC_ENET_TX_FRPPG; i<TX_RING_SIZE; i++) {
if (j >= FEC_ENET_TX_FRPPG) {
mem_addr = __get_free_page(GFP_KERNEL);
j = 1;
} else {
mem_addr += FEC_ENET_TX_FRSIZE;
j++;
}
fep->tx_bounce[i] = (unsigned char *) mem_addr;
/* Initialize the BD for every fragment in the page */
bdp->cbd_sc = 0;
bdp->cbd_bufaddr = 0;
bdp++;
}
/* Set the last buffer to wrap */
bdp--;
bdp->cbd_sc |= BD_SC_WRAP;
#ifdef HAVE_mii_link_interrupt
fec_request_mii_intr(dev);
#endif