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atl1: use csum_start 

Use skb->csum_start for tx checksum offload preparation. Also swap
the variables css and cso so they hold the intended values of csum
start and offset, respectively.

Signed-off-by: Jay Cliburn <jacliburn@bellsouth.net>
Acked-by: Chris Snook <csnook@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jay Cliburn 2008-02-02 19:50:08 -06:00 committed by Jeff Garzik
parent 401c0aabec
commit 5ca3bc3041
1 changed files with 6 additions and 5 deletions
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11
drivers/net/atlx/atl1.c
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@ -1347,16 +1347,17 @@ static int atl1_tx_csum(struct atl1_adapter *adapter, struct sk_buff *skb,
u8 css, cso;
if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
cso = skb_transport_offset(skb);
css = cso + skb->csum_offset;
if (unlikely(cso & 0x1)) {
css = (u8) (skb->csum_start - skb_headroom(skb));
cso = css + (u8) skb->csum_offset;
if (unlikely(css & 0x1)) {
/* L1 hardware requires an even number here */
dev_printk(KERN_DEBUG, &adapter->pdev->dev,
"payload offset not an even number\n");
return -1;
}
ptpd->word3 |= (cso & TPD_PLOADOFFSET_MASK) <<
ptpd->word3 |= (css & TPD_PLOADOFFSET_MASK) <<
TPD_PLOADOFFSET_SHIFT;
ptpd->word3 |= (css & TPD_CCSUMOFFSET_MASK) <<
ptpd->word3 |= (cso & TPD_CCSUMOFFSET_MASK) <<
TPD_CCSUMOFFSET_SHIFT;
ptpd->word3 |= 1 << TPD_CUST_CSUM_EN_SHIFT;
return true;