[3.13.y.z extended stable] Patch "igb: fix stats for i210 rx_fifo_errors" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    igb: fix stats for i210 rx_fifo_errors

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From e857a03881c0471e57f72fa7955c94127d2c616d Mon Sep 17 00:00:00 2001
From: Todd Fujinaka <todd.fujinaka at intel.com>
Date: Tue, 8 Apr 2014 05:36:15 +0000
Subject: igb: fix stats for i210 rx_fifo_errors

commit e66c083aab32842f225bae2a2c30744bf96abaec upstream.

RQDPC on i210/i211 is R/W not ReadClear. Clear after reading.

Signed-off-by: Todd Fujinaka <todd.fujinaka at intel.com>
Tested-by: Aaron Brown <aaron.f.brown at intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
Cc: Tim Gardner <tim.gardner at canonical.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 025e5f4..0f42ce8 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -4909,8 +4909,10 @@ void igb_update_stats(struct igb_adapter *adapter,

 	rcu_read_lock();
 	for (i = 0; i < adapter->num_rx_queues; i++) {
-		u32 rqdpc = rd32(E1000_RQDPC(i));
 		struct igb_ring *ring = adapter->rx_ring[i];
+		u32 rqdpc = rd32(E1000_RQDPC(i));
+		if (hw->mac.type >= e1000_i210)
+			wr32(E1000_RQDPC(i), 0);

 		if (rqdpc) {
 			ring->rx_stats.drops += rqdpc;
--
1.9.1