e1000e: Support sending custom Ethernet CRC.

This can aid with testing the RX logic for bad
CRCs.

Signed-off-by: Ben Greear <greearb@candelatech.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/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 30c8c15..340442c 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4613,6 +4613,7 @@ link_up:
 #define E1000_TX_FLAGS_VLAN            0x00000002
 #define E1000_TX_FLAGS_TSO             0x00000004
 #define E1000_TX_FLAGS_IPV4            0x00000008
+#define E1000_TX_FLAGS_NO_FCS          0x00000010
 #define E1000_TX_FLAGS_VLAN_MASK       0xffff0000
 #define E1000_TX_FLAGS_VLAN_SHIFT      16
 
@@ -4872,6 +4873,9 @@ static void e1000_tx_queue(struct e1000_ring *tx_ring, int tx_flags, int count)
                txd_upper |= (tx_flags & E1000_TX_FLAGS_VLAN_MASK);
        }
 
+       if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
+               txd_lower &= ~(E1000_TXD_CMD_IFCS);
+
        i = tx_ring->next_to_use;
 
        do {
@@ -4889,6 +4893,10 @@ static void e1000_tx_queue(struct e1000_ring *tx_ring, int tx_flags, int count)
 
        tx_desc->lower.data |= cpu_to_le32(adapter->txd_cmd);
 
+       /* txd_cmd re-enables FCS, so we'll re-disable it here as desired. */
+       if (unlikely(tx_flags & E1000_TX_FLAGS_NO_FCS))
+               tx_desc->lower.data &= ~(cpu_to_le32(E1000_TXD_CMD_IFCS));
+
        /*
         * Force memory writes to complete before letting h/w
         * know there are new descriptors to fetch.  (Only
@@ -5094,6 +5102,9 @@ static netdev_tx_t e1000_xmit_frame(struct sk_buff *skb,
        if (skb->protocol == htons(ETH_P_IP))
                tx_flags |= E1000_TX_FLAGS_IPV4;
 
+       if (unlikely(skb->no_fcs))
+               tx_flags |= E1000_TX_FLAGS_NO_FCS;
+
        /* if count is 0 then mapping error has occurred */
        count = e1000_tx_map(tx_ring, skb, first, max_per_txd, nr_frags, mss);
        if (count) {
@@ -6221,6 +6232,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
        /* Set user-changeable features (subset of all device features) */
        netdev->hw_features = netdev->features;
        netdev->hw_features |= NETIF_F_RXFCS;
+       netdev->priv_flags |= IFF_SUPP_NOFCS;
 
        if (adapter->flags & FLAG_HAS_HW_VLAN_FILTER)
                netdev->features |= NETIF_F_HW_VLAN_FILTER;