# 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 Functions (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. ## 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 ``` ### Promisc mode In cases when interface is used in the L2 mode or promisc mode is needed for some other reason, trust needs to be set to "on" using the linux "ip link" utility. ``` ip link set dev <PF inteface name> vf <VF id> trust on ``` ### L2 spoofing check By default Virtual Function is not allowed to send ethernet frames which have source MAC address different than address assigned to the VF. In some cases it is expected that VPP will send such frames (e.g. L2 bridging, bonding, l2 cross-connect) and in such cases spoof chack needs to be turned off by issuing following command: ``` ip link set dev <PF inteface name> vf <VF id> spoofchk off ``` ### Interface Creation Interfaces can be dynamically created by using following CLI: ``` create interface avf 0000:3b:02.0 set int state avf-0/3b/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.