IXGBE_FCDDC
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));