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

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55421


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 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.

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