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.. SPDX-License-Identifier: BSD-3-Clause
Copyright(c) 2010-2014 Intel Corporation.
Driver for VM Emulated Devices
==============================
The DPDK EM poll mode driver supports the following emulated devices:
* qemu-kvm emulated Intel® 82540EM Gigabit Ethernet Controller (qemu e1000 device)
* VMware* emulated Intel® 82545EM Gigabit Ethernet Controller
* VMware emulated Intel® 8274L Gigabit Ethernet Controller.
Validated Hypervisors
---------------------
The validated hypervisors are:
* KVM (Kernel Virtual Machine) with Qemu, version 0.14.0
* KVM (Kernel Virtual Machine) with Qemu, version 0.15.1
* VMware ESXi 5.0, Update 1
Recommended Guest Operating System in Virtual Machine
-----------------------------------------------------
The recommended guest operating system in a virtualized environment is:
* Fedora* 18 (64-bit)
For supported kernel versions, refer to the *DPDK Release Notes*.
Setting Up a KVM Virtual Machine
--------------------------------
The following describes a target environment:
* Host Operating System: Fedora 14
* Hypervisor: KVM (Kernel Virtual Machine) with Qemu version, 0.14.0
* Guest Operating System: Fedora 14
* Linux Kernel Version: Refer to the DPDK Getting Started Guide
* Target Applications: testpmd
The setup procedure is as follows:
#. Download qemu-kvm-0.14.0 from
`http://sourceforge.net/projects/kvm/files/qemu-kvm/ <http://sourceforge.net/projects/kvm/files/qemu-kvm/>`_
and install it in the Host OS using the following steps:
When using a recent kernel (2.6.25+) with kvm modules included:
.. code-block:: console
tar xzf qemu-kvm-release.tar.gz cd qemu-kvm-release
./configure --prefix=/usr/local/kvm
make
sudo make install
sudo /sbin/modprobe kvm-intel
When using an older kernel or a kernel from a distribution without the kvm modules,
you must download (from the same link), compile and install the modules yourself:
.. code-block:: console
tar xjf kvm-kmod-release.tar.bz2
cd kvm-kmod-release
./configure
make
sudo make install
sudo /sbin/modprobe kvm-intel
Note that qemu-kvm installs in the /usr/local/bin directory.
For more details about KVM configuration and usage, please refer to:
`http://www.linux-kvm.org/page/HOWTO1 <http://www.linux-kvm.org/page/HOWTO1>`_.
#. Create a Virtual Machine and install Fedora 14 on the Virtual Machine.
This is referred to as the Guest Operating System (Guest OS).
#. Start the Virtual Machine with at least one emulated e1000 device.
.. note::
The Qemu provides several choices for the emulated network device backend.
Most commonly used is a TAP networking backend that uses a TAP networking device in the host.
For more information about Qemu supported networking backends and different options for configuring networking at Qemu,
please refer to:
— `http://www.linux-kvm.org/page/Networking <http://www.linux-kvm.org/page/Networking>`_
— `http://wiki.qemu.org/Documentation/Networking <http://wiki.qemu.org/Documentation/Networking>`_
— `http://qemu.weilnetz.de/qemu-doc.html <http://qemu.weilnetz.de/qemu-doc.html>`_
For example, to start a VM with two emulated e1000 devices, issue the following command:
.. code-block:: console
/usr/local/kvm/bin/qemu-system-x86_64 -cpu host -smp 4 -hda qemu1.raw -m 1024
-net nic,model=e1000,vlan=1,macaddr=DE:AD:1E:00:00:01
-net tap,vlan=1,ifname=tapvm01,script=no,downscript=no
-net nic,model=e1000,vlan=2,macaddr=DE:AD:1E:00:00:02
-net tap,vlan=2,ifname=tapvm02,script=no,downscript=no
where:
— -m = memory to assign
— -smp = number of smp cores
— -hda = virtual disk image
This command starts a new virtual machine with two emulated 82540EM devices,
backed up with two TAP networking host interfaces, tapvm01 and tapvm02.
.. code-block:: console
# ip tuntap show
tapvm01: tap
tapvm02: tap
#. Configure your TAP networking interfaces using ip/ifconfig tools.
#. Log in to the guest OS and check that the expected emulated devices exist:
.. code-block:: console
# lspci -d 8086:100e
00:04.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 03)
00:05.0 Ethernet controller: Intel Corporation 82540EM Gigabit Ethernet Controller (rev 03)
#. Install the DPDK and run testpmd.
Known Limitations of Emulated Devices
-------------------------------------
The following are known limitations:
#. The Qemu e1000 RX path does not support multiple descriptors/buffers per packet.
Therefore, rte_mbuf should be big enough to hold the whole packet.
For example, to allow testpmd to receive jumbo frames, use the following:
testpmd [options] -- --mbuf-size=<your-max-packet-size>
#. Qemu e1000 does not validate the checksum of incoming packets.
#. Qemu e1000 only supports one interrupt source, so link and Rx interrupt should be exclusive.
#. Qemu e1000 does not support interrupt auto-clear, application should disable interrupt immediately when woken up.
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