Re: pci passthrough - VF reset at boot is dropping assigned MAC

[David Ahern <dsahern@gmail.com>]

On 04/25/11 11:30, Alex Williamson wrote:
> So yes, it does change.  However, if I set the VF mac instead of using a
> randomly generated one, I get:
> 
> # modprobe -r igbvf
> # ip link set eth2 vf 6 mac 02:00:10:91:73:01
> # modprobe igbvf
> # dmesg | grep "igbvf 0000\:01\:11.5\: Address\:"
> igbvf 0000:01:11.5: Address: d2:c8:17:d6:97:f7
> igbvf 0000:01:11.5: Address: 4e:ee:2a:d8:12:7c
> igbvf 0000:01:11.5: Address: 02:00:10:91:73:01
> # modprobe -r igbvf
> # echo 1 > /sys/bus/pci/devices/0000:01:11.5/reset
> # modprobe igbvf
> # dmesg | grep "igbvf 0000\:01\:11.5\: Address\:"
> igbvf 0000:01:11.5: Address: d2:c8:17:d6:97:f7
> igbvf 0000:01:11.5: Address: 4e:ee:2a:d8:12:7c
> igbvf 0000:01:11.5: Address: 02:00:10:91:73:01
> igbvf 0000:01:11.5: Address: 02:00:10:91:73:01
> 
> So now it sticks.  You're going to get random mac addresses on the VFs
> every time you reload the igb driver (ie. ever boot) anyway (at least
> with these sr-iov cards), so if you need consistent macs, they probably
> need to be set before launching the VM anyway.  Thanks,


You lost me on this. I do not have the igbvf driver loaded in the host,
only the guest. I am setting the MAC address for the VF in the host
before launching the VM. The host's igb driver gets loaded at boot only.

David


> 
> Alex
>