igb: add completion timeout workaround for 82575/82576

The 82575 and 82576 hardware can both experience data corruption issues if
a pci-e completion arrives after the timeout value.  In order to avoid this
we need to increase the timeout value while pci-e master is disabled.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 39b3b6aa650b..2cb546078c52 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -5029,6 +5029,34 @@ static int igb_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
         }
 }
 
+s32 igb_read_pcie_cap_reg(struct e1000_hw *hw, u32 reg, u16 *value)
+{
+        struct igb_adapter *adapter = hw->back;
+        u16 cap_offset;
+
+        cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
+        if (!cap_offset)
+                return -E1000_ERR_CONFIG;
+
+        pci_read_config_word(adapter->pdev, cap_offset + reg, value);
+
+        return 0;
+}
+
+s32 igb_write_pcie_cap_reg(struct e1000_hw *hw, u32 reg, u16 *value)
+{
+        struct igb_adapter *adapter = hw->back;
+        u16 cap_offset;
+
+        cap_offset = pci_find_capability(adapter->pdev, PCI_CAP_ID_EXP);
+        if (!cap_offset)
+                return -E1000_ERR_CONFIG;
+
+        pci_write_config_word(adapter->pdev, cap_offset + reg, *value);
+
+        return 0;
+}
+
 static void igb_vlan_rx_register(struct net_device *netdev,
                                  struct vlan_group *grp)
 {