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ixgbe: fix for 82599 errata marking UDP checksum errors 

There is an 82599 errata that UDP frames with a zero checksum are
incorrectly marked as checksum invalid by the hardware.  This was
leading to misleading hw_csum_rx_error counts. This patch adds a
test around this counter increase for this condition.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Don Skidmore 2009-07-23 18:00:39 +00:00 committed by David S. Miller
parent ca52efd549
commit 8bae1b2b13
1 changed files with 15 additions and 2 deletions
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17
drivers/net/ixgbe/ixgbe_main.c
View File

@ -511,8 +511,11 @@ static void ixgbe_receive_skb(struct ixgbe_q_vector *q_vector,
* @skb: skb currently being received and modified
**/
static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
u32 status_err, struct sk_buff *skb)
union ixgbe_adv_rx_desc *rx_desc,
struct sk_buff *skb)
{
u32 status_err = le32_to_cpu(rx_desc->wb.upper.status_error);
skb->ip_summed = CHECKSUM_NONE;
/* Rx csum disabled */
@ -530,6 +533,16 @@ static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
return;
if (status_err & IXGBE_RXDADV_ERR_TCPE) {
u16 pkt_info = rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
/*
* 82599 errata, UDP frames with a 0 checksum can be marked as
* checksum errors.
*/
if ((pkt_info & IXGBE_RXDADV_PKTTYPE_UDP) &&
(adapter->hw.mac.type == ixgbe_mac_82599EB))
return;
adapter->hw_csum_rx_error++;
return;
}
@ -803,7 +816,7 @@ static bool ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
goto next_desc;
}
ixgbe_rx_checksum(adapter, staterr, skb);
ixgbe_rx_checksum(adapter, rx_desc, skb);
/* probably a little skewed due to removing CRC */
total_rx_bytes += skb->len;