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e100: 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>
hifive-unleashed-5.1
Ben Greear 2012-02-11 15:39:35 +00:00 committed by Jeff Kirsher
parent 719cdac54e
commit 75f58a5376
1 changed files with 16 additions and 0 deletions
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16
drivers/net/ethernet/intel/e100.c
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@ -412,6 +412,10 @@ enum cb_status {
cb_ok = 0x2000,
};
/**
* cb_command - Command Block flags
* @cb_tx_nc: 0: controler does CRC (normal), 1: CRC from skb memory
*/
enum cb_command {
cb_nop = 0x0000,
cb_iaaddr = 0x0001,
@ -421,6 +425,7 @@ enum cb_command {
cb_ucode = 0x0005,
cb_dump = 0x0006,
cb_tx_sf = 0x0008,
cb_tx_nc = 0x0010,
cb_cid = 0x1f00,
cb_i = 0x2000,
cb_s = 0x4000,
@ -1724,6 +1729,16 @@ static void e100_xmit_prepare(struct nic *nic, struct cb *cb,
struct sk_buff *skb)
{
cb->command = nic->tx_command;
/*
* Use the last 4 bytes of the SKB payload packet as the CRC, used for
* testing, ie sending frames with bad CRC.
*/
if (unlikely(skb->no_fcs))
cb->command |= __constant_cpu_to_le16(cb_tx_nc);
else
cb->command &= ~__constant_cpu_to_le16(cb_tx_nc);
/* interrupt every 16 packets regardless of delay */
if ((nic->cbs_avail & ~15) == nic->cbs_avail)
cb->command |= cpu_to_le16(cb_i);
@ -2778,6 +2793,7 @@ static int __devinit e100_probe(struct pci_dev *pdev,
return -ENOMEM;
netdev->hw_features |= NETIF_F_RXFCS;
netdev->priv_flags |= IFF_SUPP_NOFCS;
netdev->netdev_ops = &e100_netdev_ops;
SET_ETHTOOL_OPS(netdev, &e100_ethtool_ops);