From 874183072de73a36a958585e3186639fd2634701 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 8 Mar 2007 12:42:30 -0800 Subject: sky2: turn off Rx checksum on bad hardware 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 Signed-off-by: Jeff Garzik --- drivers/net/sky2.c | 24 +++++++++++++++++++++--- 1 file changed, 21 insertions(+), 3 deletions(-) diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c index 5383997..ab0ab92 100644 --- a/drivers/net/sky2.c +++ b/drivers/net/sky2.c @@ -2165,9 +2165,27 @@ force_update: /* 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: -- cgit v1.1