unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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ethoc: fix buffer address mapping

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The pointer address in buffer descriptors is physical address. The
pointer that processor used to access packet is virtual address.

Though the higher bits of pointer address used by the MAC may be
truncated to zero in special case, it is not always true in larger
designs.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Chou 2009-10-04 23:33:18 +00:00 committed by David S. Miller
parent 639b62a528
commit 3ee19a85bb
1 changed files with 3 additions and 4 deletions
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7
drivers/net/ethoc.c
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@ -284,7 +284,7 @@ static int ethoc_init_ring(struct ethoc *dev)
dev->cur_rx = 0;
/* setup transmission buffers */
bd.addr = 0;
bd.addr = virt_to_phys(dev->membase);
bd.stat = TX_BD_IRQ | TX_BD_CRC;
for (i = 0; i < dev->num_tx; i++) {
@ -295,7 +295,6 @@ static int ethoc_init_ring(struct ethoc *dev)
bd.addr += ETHOC_BUFSIZ;
}
bd.addr = dev->num_tx * ETHOC_BUFSIZ;
bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
for (i = 0; i < dev->num_rx; i++) {
@ -401,7 +400,7 @@ static int ethoc_rx(struct net_device *dev, int limit)
int size = bd.stat >> 16;
struct sk_buff *skb = netdev_alloc_skb(dev, size);
if (likely(skb)) {
void *src = priv->membase + bd.addr;
void *src = phys_to_virt(bd.addr);
memcpy_fromio(skb_put(skb, size), src, size);
skb->protocol = eth_type_trans(skb, dev);
priv->stats.rx_packets++;
@ -823,7 +822,7 @@ static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
else
bd.stat &= ~TX_BD_PAD;
dest = priv->membase + bd.addr;
dest = phys_to_virt(bd.addr);
memcpy_toio(dest, skb->data, skb->len);
bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);