QA:Testcase biosdevname SRIOV virtual function interface names

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Description

This test case verifies how network interfaces registered for the Virtual Functions enabled by network adapters with SRIOV capability. For more information on SRIOV and how to enable Virtual Functions can be found on Virtualization_SRIOV.

Setup

1. Plug in a PCI add-in network adapter with SRIOV capability. In this example, we'll choose PCI Slot 3.

   07:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
   # lspci -s 07:00.0  -n
   07:00.0 0200: 8086:10c9 (rev 01)

2. Enable the virtual functions by re-loading the Physical Function driver. This can be automated during system boot using the following command to adjust the max_vfs module parameter.

   # cat << EOF > /etc/modprobe.d/igb.conf
   options igb max_vfs=2
   EOF

3. Verify that Virtual Functions are enabled by issuing the command lspci. In the lspci output, observe that 2 virtual functions for each of the Physical Functions is listed. For example:

   # lspci | grep -i ether
   07:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
   07:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
   07:10.0 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
   07:10.1 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
   07:10.2 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
   07:10.3 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)

How to test

In the above example, Intel 82576 dual port network adapter, in PCI Slot 3, enables 2 virtual functions for each physical function.

1. Verify that Virtual Function interfaces get the names of the form: pci<slot>#<port>_<virtual-function-instance>. This can be confirmed by the command ls /sys/class/net/.

Expected Results

1. Make sure every virtual function enabled has names of the form: pci<slot>#<port>_<virtual-function-instance>. Sample expected output is listed below.

# ls /sys/class/net/
lo  pci3#1  pci3#1_0  pci3#1_1  pci3#2  pci3#2_0  pci3#2_1  pci4#1

The above virtual function interface names are described in detail below.

* pci3#1_0 - Add-in network interface on PCI Slot 3, Port 1, Virtual Function Instance 0
* pci3#1_1 - Add-in network interface on PCI Slot 3, Port 1, Virtual Function Instance 1
* pci3#2_0 - Add-in network interface on PCI Slot 3, Port 2, Virtual Function Instance 0
* pci3#2_1 - Add-in network interface on PCI Slot 3, Port 2, Virtual Function Instance 1