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13.2. Using SR-IOV

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I'm having issues on creating VF with ubuntu But if I check using lspci grep -i ethernet I only get the physical cards.

I have also tried:. I solved this, was a lack of documentation from Dell side. Ubuntu Community Ask!

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Включение технологии SR-IOV на серверах Dell PowerEdge

In general posting as pastebin or such a full dmesg is often useful for IOMMU setup related questions. Thank ChristianEhrhardt here the [output of dmesg grep iommu ] pastebin. Also I need to configure it using sysfs instead of the parameter to the module? Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag.

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Ask Ubuntu works best with JavaScript enabled.This functionality was first introduced in the OpenStack Juno release. Each device can be directly assigned to an instance, bypassing the hypervisor and virtual switch layer.

As a result, users are able to achieve low latency and near-line wire speed.

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The SR-IOV agent allows you to set the admin state of ports, configure port security enable and disable spoof checkingand configure QoS rate limiting and minimum bandwidth. The ability to control port security and QoS rate limit settings was added in Liberty. We recommend using VLAN provider networks for segregation. Throughout this guide, eth3 is used as the PF and physnet2 is used as the provider network configured as a VLAN range.

These ports may vary in different environments. We use eth3 as PF, which is also used as the interface for the VLAN provider network and has access to the private networks of all machines.

Steps may differ for different hardware configurations. If the PF is attached again to the operating system, the number of VFs assigned to this interface will be zero. To keep the number of VFs always assigned to this interface, modify the interfaces configuration file adding an ifup script command. Verify that the VFs have been created and are in up state. For example:. If the interfaces are down, set them to up before launching a guest, otherwise the instance will fail to spawn:.

However, this is not available by default on many major distributions. Configure which PCI devices the nova-compute service may use.

Edit the nova. This tells the Compute service that all VFs belonging to eth3 are allowed to be passed through to instances and belong to the provider network physnet2. For example, to match any domain, bus 0aslot 00and all functions:.

This capability is only supported starting with version There are security implications of enabling trusted ports. The trusted VFs can be set into VF promiscuous mode which will enable it to receive unmatched and multicast traffic sent to the physical function. The ports will have to be created with a binding profile to match the trusted tag, see Launching instances with SR-IOV ports.

Restart the nova-compute service for the changes to go into effect.Jump to navigation. If you must use the macvtap method, use virtio as your device model because every other option will give you horrible performance. This tutorial evaluates three of those ways:. Most of the steps in this tutorial can be done using either the command line virsh tool or using the virt-manager GUI. Note that there are several steps in this tutorial that cannot be done via the GUI.

The test setup included two physical servers—net2s22c05 and net2s18c03—and one VM—sr-iov-vf-testvm—that was hosted on net2s22c Net2s22C05 had one each of the four Intel Ethernet Server Adapters listed above with one port in each adapter directly linked to a NIC port with equivalent link speed in net2s18c The NIC ports on each system were in the same subnet: those on net2s18c03 all had static IP addresses with.

Note This OS and Linux kernel version were chosen based on a specific usage. Otherwise, newer versions would have been used. Note Ubuntu I built the driver from source and then loaded it into the kernel. I used version 2. Update January Ubuntu The complete KVM definition file is available online.

This tutorial does not focus on performance. When evaluating the advantages and disadvantages of each insertion method, I looked at the following:. In the virt-manager GUI, the following typical options are available:. Additional options were available on our test host machine, but they had to be entered into the VM XML definition using virsh edit.

I additionally evaluated the following:. Because this is not a performance-oriented paper, this data is provided only to give a rough idea of the performance of different configurations. The command I ran on the server system was. This is an admittedly subjective evaluation parameter. Once the VF has been created, the network adapter driver automatically creates the infrastructure necessary to use it.

In order to find the PCI bus information for the VF, you need to know how to identify it, and sometimes the interface name that is assigned to the VF seems arbitrary.

how to enable sr iov in linux

For example, in the following figure there are two VFs and the PCI bus information is outlined in red, but it is impossible to determine from this information which physical port the VFs are associated with. The following bash script lists all the VFs associated with a physical function. After the desired VF comes into focus, click Finish.

When using this method of directly inserting the PCI host device into the VM, there is no ability to change the host device model: for all NIC models, the host used the vfio driver. With the exception of the XL, which showed a link speed of 40 Gbps, all 10 GB adapters showed a link speed of 10 Gbps. While the XL performed better than the 10 Gb NICs, it performed at roughly 70 percent line rate when the iperf server ran on the VM, and at roughly 40 percent line rate when the iperf client was on the VM.

The one advantage to this method is that it allows control over which VF is inserted into the VM, whereas the virtual network pool of adapters method does not. Performance is not significantly different than the method that involves a KVM virtual network pool of adapters.

However, that method is much simpler to use. Unlike the previous method, this method does not require you to know the PCI bus information for the VF, but you do need to know the name of the interface that the OS created for the VF when it was created.

As shown in the following figure, after creating the VF, use the bash script listed above to display the network interface names and PCI bus information assigned to the VFs.

how to enable sr iov in linux

To use the command-line with the macvtap adapter solution, with the VM shut off, edit the VM configuration file and add an interface tag with sub-elements and attributes shown below. The interface type is directand the dev attribute of the source sub-element must point to the interface name that the host OS assigned to the target VF. Be sure to specify the mode attribute of the source element as passthrough :. The fact that there are two MAC addresses assigned to the same VF—one by the host OS and one by the VM—suggests that the network stack using this configuration is more complex and likely slower.Privacy Terms.

Quick links. I set up a couple of these cards a few years ago, but I am having real problems getting these to work, no matter what I do I can't get it to enable the virtual functions. I am the root user. CentOS 6 will die in November - migrate sooner rather than later!

Full time Geek, part time moderator. Use the FAQ Luke. You cannot create more VFs than the number listed in that file. Code: Select all -bash: echo: write error: Numerical result out of range. If so how do I change it? Are there any tests I can do to find out if it's the BIOS, operating system or card that's not supporting it?

Is igb the driver or is that something different? Might I be able to find another driver for the card that does support it?

Single-Root Input/Output Virtualization (SR-IOV) with Linux* Containers

Thank you for your help it is most greatly appreciated!! There's a per card setting and there's also one that controls whether it's off or on. So you can enable it globally but not on any of the cards and then it won't work or you can enable it in the card but not globally and it still won't work. I have done the first 2 but the third one for enabling it on the card I haven't, so I am very optimistic for tomorrow Thank you again. Board index All times are UTC.This section covers attaching Virtual Function to a guest as an additional network device.

Use the lspci command to verify if the device was detected. Note that the output has been modified to remove all other devices. If the device is supported the driver kernel module should be loaded automatically by the kernel.

Optional parameters can be passed to the module using the modprobe command. The Intel network interface card uses the igb driver kernel module. For this particular card the valid range is 0 to 7. Using the lspci command, list the newly added Virtual Functions attached to the Intel network device.

The identifier for the PCI device is found with the -n parameter of the lspci command. The libvirt service must find the device to add a device to a guest. Use the virsh nodedev-list command to list available host devices. The serial numbers for the Virtual Functions and Physical Functions should be in the list.

Use the virsh nodedev-dumpxml command to get advanced output for both devices. Note the busslot and function parameters of the Virtual Function, these are required for adding the device. Convert slot and function values to hexadecimal values from decimal to get the PCI bus addresses. Append "0x" to the beginning of the output to tell the computer that the value is a hexadecimal number. Use the printf utility to convert decimal values to hexadecimal values. Open the XML configuration file with the virsh edit command.

This example edits a guest named MyGuest. The default text editor will open the libvirt configuration file for the guest. Add the new device to the devices section of the XML configuration file. The guest should start successfully and detect a new network interface card. Introduction Here are the common uses of Markdown.

Learn more Close.Because of this, even if the guest is assigned the same VF after a reboot, when the host is rebooted the guest determines its network adapter to have a new MAC address. As a result, the guest believes there is new hardware connected each time, and will usually require re-configuration of the guest's network settings.

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Use the lspci command to verify whether the device was detected. If the device is supported the driver kernel module should be loaded automatically by the kernel. Optional parameters can be passed to the module using the modprobe command.

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The Intel network interface card uses the igb driver kernel module. For this particular card the valid range is 0 to 7. For example:.

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Using the lspci command, list the newly added Virtual Functions attached to the Intel network device. Alternatively, use grep to search for Virtual Functionto search for devices that support Virtual Functions.

how to enable sr iov in linux

The identifier for the PCI device is found with the -n parameter of the lspci command. The Physical Functions correspond to 0b All Virtual Functions have Virtual Function in the description.

The libvirt service must recognize the device before adding a device to a virtual machine. All punctuation characters, ; and. Use the virsh nodedev-list command and the grep command to filter the Intel network device from the list of available host devices. This may vary for your system and may result in additional devices.

The serial numbers for the Virtual Functions and Physical Functions should be in the list. Use the virsh nodedev-dumpxml command to get advanced output for both devices. Note the busslot and function parameters of the Virtual Function: these are required for adding the device.

If you do not specify a MAC address, one will be automatically generated. When the virtual machine starts, it should see a network device of the type provided by the physical adapter, with the configured MAC address. This MAC address will remain unchanged across host and guest reboots. Add the Virtual Function to the virtual machine using the following command with the temporary file created in the previous step.

Why using Single Root I/O Virtualization (SR-IOV) can help improve I/O performance and Reduce Costs

This attaches the new device immediately and saves it for subsequent guest restarts. Using the --config option ensures the new device is available after future guest restarts. The virtual machine detects a new network interface card.

Introduction Here are the common uses of Markdown. Learn more Close.You can directly assign each virtual PCIe device to a VM, bypassing the hypervisor and virtual switch layer.

As a result, users are able to achieve low latency and near-line wire speed. The sriov-agent allows you to set the admin state of ports and starting from Liberty allows you to control port security enable and disable spoofchecking and QoS rate limit settings. With the sriov-agent mode is default in Liberty. Without the sriov-agent mode is deprecated in Liberty and removed in Mitaka.

QoS is supported since Liberty, while it has limitations. Security Group is not supported. No OpenStack Dashboard integration.

Throughout this guide, eth3 is used as the PF and physnet2 is used as the provider network configured as a VLAN range. You are expected to change this according to your actual environment. Currently the following manufacturers are known to work:. If the interface is down, make sure it is set to up before launching a guest, else the instance will fail to spawn:. Tell nova-compute which pci devices are allowed to be passed through. This tells nova that all VFs belonging to eth3 are allowed to be passed through to VMs and belong to the neutron provider network physnet2.

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Restart nova compute with service nova-compute restart to let the changes have effect. Add sriovnicswitch as mechanism driver. To make the changes have effect, restart the neutron-server service with the service neutron-server restart. Now restart the nova-scheduler service with service nova-scheduler restart.

Enable the neutron-sriov-agent to start automatically at system start. If your distribution does not come with a daemon file for your init system, create a daemon configuration file. For example on Ubuntu install the package:. To use this feature, you must:. All InfiniBand networks must have a subnet manager running for the network to function. This is true even when doing a simple network of two machines with no switch and the cards are plugged in back-to-back.

A subnet manager is required for the link on the cards to come up. It is possible to have more than one subnet manager. In this case, one of them will act as the master, and any other will act as a slave that will take over when the master subnet manager fails. Install the ebrctl utility on the compute nodes. Except where otherwise noted, this document is licensed under Creative Commons Attribution 3. See all OpenStack Legal Documents. Toggle navigation. VF Virtual Function. This is a virtual PCIe device created from a physical Ethernet controller.

In order to enable SR-IOV, the following steps are required: Create Virtual Functions Compute Whitelist PCI devices in nova-compute Compute Configure neutron-server Controller Configure nova-scheduler Controller Enable neutron sriov-agent Compute Neutron sriov-agent There are 2 ways of configuring SR-IOV: With the sriov-agent running on each compute node Without the sriov-agent running on each compute node The sriov-agent allows you to set the admin state of ports and starting from Liberty allows you to control port security enable and disable spoofchecking and QoS rate limit settings.