netdev - [stable-2.6.32 PATCH] igb: rx_fifo

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Message-ID: <20101005230407.24172.84596.stgit@localhost.localdomain>
Date:	Tue, 05 Oct 2010 16:04:09 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	greg@...ah.com
Cc:	stable@...nel.org, netdev@...r.kernel.org, gospo@...hat.com,
	bphilips@...ell.com, Eric Dumazet <eric.dumazet@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [stable-2.6.32 PATCH] igb: rx_fifo_errors counter fix

From: Eric Dumazet <eric.dumazet@...il.com>

Alexey Vlasov reported insane rx_queue_drop_packet_count
(rx_fifo_errors) values.

IGB drivers is doing an accumulation for 82575, instead using a zero
value for rqdpc_total.

Reported-by: Alexey Vlasov <renton@...ton.name>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Tested-by: Emil Tantilov <emil.s.tantilov@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_main.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 8111776..a13705b 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -3552,6 +3552,7 @@ void igb_update_stats(struct igb_adapter *adapter)
 	struct e1000_hw *hw = &adapter->hw;
 	struct pci_dev *pdev = adapter->pdev;
 	u16 phy_tmp;
+	unsigned long rqdpc_total = 0;
 
 #define PHY_IDLE_ERROR_COUNT_MASK 0x00FF
 
@@ -3645,7 +3646,6 @@ void igb_update_stats(struct igb_adapter *adapter)
 
 	if (hw->mac.type != e1000_82575) {
 		u32 rqdpc_tmp;
-		u64 rqdpc_total = 0;
 		int i;
 		/* Read out drops stats per RX queue.  Notice RQDPC (Receive
 		 * Queue Drop Packet Count) stats only gets incremented, if
@@ -3660,7 +3660,6 @@ void igb_update_stats(struct igb_adapter *adapter)
 			adapter->rx_ring[i].rx_stats.drops += rqdpc_tmp;
 			rqdpc_total += adapter->rx_ring[i].rx_stats.drops;
 		}
-		adapter->net_stats.rx_fifo_errors = rqdpc_total;
 	}
 
 	/* Note RNBC (Receive No Buffers Count) is an not an exact
@@ -3668,7 +3667,7 @@ void igb_update_stats(struct igb_adapter *adapter)
 	 * one of the reason for saving it in rx_fifo_errors, as its
 	 * potentially not a true drop.
 	 */
-	adapter->net_stats.rx_fifo_errors += adapter->stats.rnbc;
+	adapter->net_stats.rx_fifo_errors = rqdpc_total + adapter->stats.rnbc;
 
 	/* RLEC on some newer hardware can be incorrect so build
 	 * our own version based on RUC and ROC */

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