redonkable/alistair23-linux
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[PATCH] sky2: handle DMA boundary crossing

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Handle the case of DMA spanning 32 bit boundary.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
shemminger@osdl.org 2005-11-30 11:45:16 -08:00 committed by Jeff Garzik
parent 5a5b1ea026
commit a018e3305f
1 changed files with 12 additions and 6 deletions
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18
drivers/net/sky2.c
View file

@ -723,11 +723,17 @@ static inline struct sky2_rx_le *sky2_next_rx(struct sky2_port *sky2)
return le;
}
/* Return high part of DMA address (could be 32 or 64 bit) */
static inline u32 high32(dma_addr_t a)
{
return (a >> 16) >> 16;
}
/* Build description to hardware about buffer */
static inline void sky2_rx_add(struct sky2_port *sky2, struct ring_info *re)
{
struct sky2_rx_le *le;
u32 hi = (re->mapaddr >> 16) >> 16;
u32 hi = high32(re->mapaddr);
re->idx = sky2->rx_put;
if (sky2->rx_addr64 != hi) {
@ -735,7 +741,7 @@ static inline void sky2_rx_add(struct sky2_port *sky2, struct ring_info *re)
le->addr = cpu_to_le32(hi);
le->ctrl = 0;
le->opcode = OP_ADDR64 | HW_OWNER;
sky2->rx_addr64 = hi;
sky2->rx_addr64 = high32(re->mapaddr + re->maplen);
}
le = sky2_next_rx(sky2);
@ -1100,17 +1106,17 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
len = skb_headlen(skb);
mapping = pci_map_single(hw->pdev, skb->data, len, PCI_DMA_TODEVICE);
addr64 = (mapping >> 16) >> 16;
addr64 = high32(mapping);
re = sky2->tx_ring + sky2->tx_prod;
/* Send high bits if changed */
if (addr64 != sky2->tx_addr64) {
/* Send high bits if changed or crosses boundary */
if (addr64 != sky2->tx_addr64 || high32(mapping + len) != sky2->tx_addr64) {
le = get_tx_le(sky2);
le->tx.addr = cpu_to_le32(addr64);
le->ctrl = 0;
le->opcode = OP_ADDR64 | HW_OWNER;
sky2->tx_addr64 = addr64;
sky2->tx_addr64 = high32(mapping + len);
}
/* Check for TCP Segmentation Offload */