igc: Add 64 bit DMA access support

On relevant platforms ndo_start_xmit can handle socket buffer
fragments in high memory

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index d3a45d3..b850098 100644 (file)
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -4445,6 +4445,9 @@ static int igc_probe(struct pci_dev *pdev,
        netdev->hw_features |= NETIF_F_NTUPLE;
        netdev->hw_features |= netdev->features;
 
+       if (pci_using_dac)
+               netdev->features |= NETIF_F_HIGHDMA;
+
        /* MTU range: 68 - 9216 */
        netdev->min_mtu = ETH_MIN_MTU;
        netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;