igb: 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>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e96cef8..99364ed 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1964,6 +1964,8 @@ static int __devinit igb_probe(struct pci_dev *pdev,
                                 NETIF_F_IPV6_CSUM |
                                 NETIF_F_SG;
 
+       netdev->priv_flags |= IFF_SUPP_NOFCS;
+
        if (pci_using_dac) {
                netdev->features |= NETIF_F_HIGHDMA;
                netdev->vlan_features |= NETIF_F_HIGHDMA;
@@ -4293,6 +4295,8 @@ static void igb_tx_map(struct igb_ring *tx_ring,
 
        /* write last descriptor with RS and EOP bits */
        cmd_type |= cpu_to_le32(size) | cpu_to_le32(IGB_TXD_DCMD);
+       if (unlikely(skb->no_fcs))
+               cmd_type &= ~(cpu_to_le32(E1000_ADVTXD_DCMD_IFCS));
        tx_desc->read.cmd_type_len = cmd_type;
 
        /* set the timestamp */