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# Intel AVF device plugin for VPP {#avf_plugin_doc}
##Overview
This plugins provides native device support for intel Adaptive Virtual
Function (AVF). AVF is driver specification for current and future
Intel Virtual Function devices. AVF defines communication channel between
Physical Funciton (PF) and VF.
In essence, today this driver can be used only with
Intel XL710 / X710 / XXV710 adapters.
##Prerequisites
* Driver requires newer i40e PF linux driver to be installed on the system,
which supports virtualchnl interface. This code is tested with i40e driver
version 2.4.6.
* Driver requires MSI-X interrupt support, which is not supported by
uio_pci_generic driver, so vfio-pci needs to be used. On systems without IOMMU
vfio driver can still be used with recent kernels which support no-iommu mode.
##Known issues
This driver is still in experimental phase, however it shows very good
performance numbers. Following items are not implemented (yet).
* Jumbo MTU support
* Adaptive mode
* NUMA support
## Usage
### System setup
1. load VFIO driver
```
sudo modprobe vfio-pci
```
2. (systems without IOMMU only) enable unsafe NOIOMMU mode
```
echo Y | sudo tee /sys/module/vfio/parameters/enable_unsafe_noiommu_mode
```
3. Create and bind SR-IOV virtual function(s)
Following script creates VF, assigns MAC address and binds VF to vfio-pci
```bash
#!/bin/bash
if [ $USER != "root" ] ; then
echo "Restarting script with sudo..."
sudo $0 ${*}
exit
fi
setup () {
cd /sys/bus/pci/devices/${1}
driver=$(basename $(readlink driver))
if [ "${driver}" != "i40e" ]; then
echo ${1} | tee driver/unbind
echo ${1} | tee /sys/bus/pci/drivers/i40e/bind
fi
ifname=$(basename net/*)
echo 0 | tee sriov_numvfs > /dev/null
echo 1 | tee sriov_numvfs > /dev/null
ip link set dev ${ifname} vf 0 mac ${2}
ip link show dev ${ifname}
vf=$(basename $(readlink virtfn0))
echo ${vf} | tee virtfn0/driver/unbind
echo vfio-pci | tee virtfn0/driver_override
echo ${vf} | sudo tee /sys/bus/pci/drivers/vfio-pci/bind
echo | tee virtfn0/driver_override
}
# Setup one VF on PF 0000:3b:00.0 and assign MAC address
setup 0000:3b:00.0 00:11:22:33:44:00
# Setup one VF on PF 0000:3b:00.1 and assign MAC address
setup 0000:3b:00.1 00:11:22:33:44:01
```
### Interface Cration
Interfaces can be dynamically created by using following CLI:
```
create interface avf 0000:3b:02.0
set int state AVF0/3b/2/0 up
```
### Interface Deletion
Interface can be deleted with following CLI:
```
delete interface avf <interface name>
```
### Interface Statistics
Interface statistics can be displayed with `sh hardware-interface <if-name>`
command.
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