dpdk 0.0.1

A wrapper around DPDK
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// This file is part of dpdk. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT. No part of dpdk, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2016-2017 The developers of dpdk. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/dpdk/master/COPYRIGHT.


#[repr(u32)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum PowerManagement
{
	Physical,
	Kvm,
}

impl PowerManagement
{
	#[inline(always)]
	pub fn current() -> Option<PowerManagement>
	{
		match unsafe { ::dpdk_sys::rte_power_get_env() }
		{
			power_management_env::PM_ENV_NOT_SET => None,
			power_management_env::PM_ENV_ACPI_CPUFREQ => Some(PowerManagement::Physical),
			power_management_env::PM_ENV_KVM_VM => Some(PowerManagement::Kvm),
		}
	}
	
	// Not thread safe
	// Not really needed; auto-detection occurs whenever a LogicalCore has power management started
	#[inline(always)]
	pub fn start(&self) -> Result<(), i32>
	{
		let environment = match *self
		{
			PowerManagement::Physical => power_management_env::PM_ENV_ACPI_CPUFREQ,
			PowerManagement::Kvm => power_management_env::PM_ENV_KVM_VM,
		};
		
		match unsafe { ::dpdk_sys::rte_power_set_env(environment) }
		{
			0 => Ok(()),
			
			x if x < 0 => Err(x),
			
			illegal @ _ => panic!("rte_power_set_env() returned an invalid positive return code of '{}'", illegal),
		}
	}
	
	// Should only be called when all threads have finished!
	#[inline(always)]
	pub fn stop()
	{
		unsafe { ::dpdk_sys::rte_power_unset_env() }
	}
}