ixgbe: Support sending custom Ethernet FCS.

Including bad FCS, used generate frames with bad FCS
to test other system's handling of RX of bad packets.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 167e898fbba6..986897bf2b83 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -6768,6 +6768,8 @@ static void ixgbe_tx_map(struct ixgbe_ring *tx_ring,
                 tx_buffer_info->dma = dma;
 
                 tx_desc->read.buffer_addr = cpu_to_le64(dma + offset);
+                if (unlikely(skb->no_fcs))
+                        cmd_type &= ~(cpu_to_le32(IXGBE_ADVTXD_DCMD_IFCS));
                 tx_desc->read.cmd_type_len = cmd_type | cpu_to_le32(size);
                 tx_desc->read.olinfo_status = olinfo_status;
 
@@ -7778,6 +7780,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
         netdev->vlan_features |= NETIF_F_SG;
 
         netdev->priv_flags |= IFF_UNICAST_FLT;
+        netdev->priv_flags |= IFF_SUPP_NOFCS;
 
         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
                 adapter->flags &= ~(IXGBE_FLAG_RSS_ENABLED |