igb: VFTA Table Fix for i350 devices

Due to a hardware problem, writes to the VFTA register can
theoretically fail. Although the likelihood of this is very low.
This patch adds a shadow vfta in the adapter struct for reading
and adds new write functions for these devices to work around the problem.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index b1863531e03f..ced544499f1b 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2206,6 +2206,7 @@ static void __devexit igb_remove(struct pci_dev *pdev)
         pci_release_selected_regions(pdev,
                                      pci_select_bars(pdev, IORESOURCE_MEM));
 
+        kfree(adapter->shadow_vfta);
         free_netdev(netdev);
 
         pci_disable_pcie_error_reporting(pdev);
@@ -2438,6 +2439,11 @@ static int __devinit igb_sw_init(struct igb_adapter *adapter)
             ((adapter->rss_queues > 1) && (adapter->vfs_allocated_count > 6)))
                 adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
 
+        /* Setup and initialize a copy of the hw vlan table array */
+        adapter->shadow_vfta = kzalloc(sizeof(u32) *
+                                E1000_VLAN_FILTER_TBL_SIZE,
+                                GFP_ATOMIC);
+
         /* This call may decrease the number of queues */
         if (igb_init_interrupt_scheme(adapter)) {
                 dev_err(&pdev->dev, "Unable to allocate memory for queues\n");