[Bug 55421] igb VF can't work in KVM guest

bugzilla-daemon
2013-03-21T21:29:16Z

Alex Williamson <alex.williamson@redhat.com> changed:

What |Removed |Added
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CC| |alex.williamson@redhat.com,
| |jeffrey.t.kirsher@intel.com

--- Comment #4 from Alex Williamson <alex.williamson@redhat.com> 2013-03-21 21:29:09 ---
Further bisected to:

commit 5ac6f91d39e0884813dc010e14552143cd1d0d8b
Author: Mitch A Williams <mitch.a.williams@intel.com>
Date: Fri Jan 18 08:57:20 2013 +0000

igb: Don't give VFs random MAC addresses

If the user has not assigned a MAC address to a VM, then don't give it a
random one. Instead, just give it zeros and let it figure out what to do
with them.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Tested-by: Stefan Assmann <sassmann@redhat.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

So, for whatever reason we no longer assign a random MAC address when using the
device in a VM (but we do still use one if attached to igbvf in the host). I
expect we'll eventually see this on all the Intel SR-IOV NICs. The solution is
to use the ip command to assign the VF a valid MAC address prior to using it
with KVM. I'll let those who made the change defend it further if they wish.