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sky2: receive checksum refactoring 

Break the largish case for handling receive checksum into a separate
function, and if there is a problem use dev_XXX routines to
show which hardware is the problem.

Turn one corner case into a BUG().  This only happens if the driver
is expecting one behavior but the chip does the old behavior;
only ever saw this when bringing up a new chip type and driver
was buggy.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2010-02-07 06:28:36 +00:00 committed by David S. Miller
parent acd12dde26
commit 375c568844
1 changed files with 28 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/net/sky2.c
View File

@ -2484,6 +2484,32 @@ static inline void sky2_rx_done(struct sky2_hw *hw, unsigned port,
}
}
static void sky2_rx_checksum(struct sky2_port *sky2, u32 status)
{
/* If this happens then driver assuming wrong format for chip type */
BUG_ON(sky2->hw->flags & SKY2_HW_NEW_LE);
/* 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((u16)(status >> 16) == (u16)status)) {
struct sk_buff *skb = sky2->rx_ring[sky2->rx_next].skb;
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = le16_to_cpu(status);
} else {
dev_notice(&sky2->hw->pdev->dev,
"%s: receive checksum problem (status = %#x)\n",
sky2->netdev->name, status);
/* Disable checksum offload */
sky2->flags &= ~SKY2_FLAG_RX_CHECKSUM;
sky2_write32(sky2->hw, Q_ADDR(rxqaddr[sky2->port], Q_CSR),
BMU_DIS_RX_CHKSUM);
}
}
/* Process status response ring */
static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
{
@ -2552,37 +2578,8 @@ static int sky2_status_intr(struct sky2_hw *hw, int to_do, u16 idx)
/* fall through */
#endif
case OP_RXCHKS:
if (!(sky2->flags & SKY2_FLAG_RX_CHECKSUM))
break;
/* If this happens then driver assuming wrong format */
if (unlikely(hw->flags & SKY2_HW_NEW_LE)) {
if (net_ratelimit())
printk(KERN_NOTICE "%s: unexpected"
" checksum status\n",
dev->name);
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 = le16_to_cpu(status);
} else {
printk(KERN_NOTICE PFX "%s: hardware receive "
"checksum problem (status = %#x)\n",
dev->name, status);
sky2->flags &= ~SKY2_FLAG_RX_CHECKSUM;
sky2_write32(sky2->hw,
Q_ADDR(rxqaddr[port], Q_CSR),
BMU_DIS_RX_CHKSUM);
}
if (likely(sky2->flags & SKY2_FLAG_RX_CHECKSUM))
sky2_rx_checksum(sky2, status);
break;
case OP_TXINDEXLE: