From: Sasha Neftin <sasha.neftin@intel.com>
Date: Wed, 13 Nov 2019 11:27:29 +0200
Subject: igc: Add 64 bit DMA access support
Patch-mainline: v5.6-rc1
Git-commit: 4439dc427d83c67aaa8447091c479c482ff85af9
References: bsc#1160634

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/igc/igc_main.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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 *pde
 	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;