Mapping identifiers and finding interface attributes

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You can use sysfs to determine the identifier, interface name, physical port, and virtual function number of a network device.

Procedure

  1. Find the identifier for a network interface. 
    
readlink /sys/class/net/<interface>/device
  2. List interfaces for a PCI device. 
    
ls /sys/bus/pci/devices/<pci_id>/net/
  3. Display the physical port (PF only). 
    
cat /sys/class/net/<interface>/phys_port_name
  4. Display the virtual function number (VF only). 
    
cat /sys/class/net/<interface>/device/vfn

Results

You can correlate the PCI identifier, interface name, physical port, and VF number of the device. These attributes can be used for identification in automation scenarios.