netdev - [NET-NEXT PATCH 01/13] ixgbe: fix rx csum return status misinterpretation

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Message-ID: <20080826112656.15787.38277.stgit@jtkirshe-mobile.jf.intel.com>
Date:	Tue, 26 Aug 2008 04:26:56 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	akpm@...ux-foundation.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [NET-NEXT PATCH 01/13] ixgbe: fix rx csum return status
	misinterpretation

From: Jesse Brandeburg <jesse.brandeburg@...el.com>

the driver was misinterpreting rx_csum return value in the descriptor
so occassionally we would indicate an rx_csum error in our stats
when there was none.  This would have no effect on traffic because
we would just hand the packet to the stack anyway without the offload
flag set, but would increase CPU for those packets that needed a recompute.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/ixgbe/ixgbe_main.c |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 53f41b6..b14192f 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -420,14 +420,12 @@ static void ixgbe_receive_skb(struct ixgbe_adapter *adapter,
  * @skb: skb currently being received and modified
  **/
 static inline void ixgbe_rx_checksum(struct ixgbe_adapter *adapter,
-					 u32 status_err,
-					 struct sk_buff *skb)
+                                     u32 status_err, struct sk_buff *skb)
 {
 	skb->ip_summed = CHECKSUM_NONE;
 
-	/* Ignore Checksum bit is set, or rx csum disabled */
-	if ((status_err & IXGBE_RXD_STAT_IXSM) ||
-	    !(adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED))
+	/* Rx csum disabled */
+	if (!(adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED))
 		return;
 
 	/* if IP and error */

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