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sky2: turn off Rx checksum on bad hardware

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On Yukon FE, occasional hardware receive checksum errors are seen.
An early indication of the problem is single bit differences in the two
checksum engines.  Use this as a detection mechanism to turn off Rx
checksumming.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2007-03-08 12:42:30 -08:00 committed by Jeff Garzik
parent 85cf572cd5
commit 874183072d
1 changed files with 21 additions and 3 deletions
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24
drivers/net/sky2.c
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@ -2165,9 +2165,27 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do)
/* fall through */
#endif
case OP_RXCHKS:
skb = sky2->rx_ring[sky2->rx_next].skb;
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = status & 0xffff;
if (!sky2->rx_csum)
break;
/* Both checksum counters are programmed to start at
* the same offset, so unless there is a problem they
* should match. This failure is an early indication that
* hardware receive checksumming won't work.
*/
if (likely(status >> 16 == (status & 0xffff))) {
skb = sky2->rx_ring[sky2->rx_next].skb;
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = status & 0xffff;
} else {
printk(KERN_NOTICE PFX "%s: hardware receive "
"checksum problem (status = %#x)\n",
dev->name, status);
sky2->rx_csum = 0;
sky2_write32(sky2->hw,
Q_ADDR(rxqaddr[le->link], Q_CSR),
BMU_DIS_RX_CHKSUM);
}
break;
case OP_TXINDEXLE: