Bug 1211758

I should also point out that, on RHEL6 at least, this patch causes a problem with the Cisco enic driver, which hasn't implemented the driver function that's behind IFLA_VFINFO_LIST. If the enic driver in 7.2 is also missing this function, we will need to implement some sort of workaround.

I filed Bug 1257004 against RHEL7 to remedy the problem in Comment 3 - it turns out that although the enic driver is missing the function that provides IFLA_VFINFO_LIST, libvirt doesn't really need it.

Verify it as follows. The result is expected. Move its status to VERIFIED.

# uname -r
3.10.0-306.0.1.el7.x86_64
# rpm -q libvirt
libvirt-1.2.17-7.el7.x86_64


# lspci|grep 82576
03:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
03:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01)
03:10.0 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
03:10.1 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
03:10.2 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)
03:10.3 Ethernet controller: Intel Corporation 82576 Virtual Function (rev 01)


# virsh nodedev-list --tree
computer
  |
.....

  |   +- pci_0000_03_10_0
  |   |   |
  |   |   +- net_enp3s16_02_c4_9d_51_07_c6

.....


# virsh net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes
 hostdev              active     no            yes
 passthrough          active     no            yes

# virsh net-dumpxml hostdev
<network>
  <name>hostdev</name>
  <uuid>e1c26bc3-5c86-42f6-a562-d860088283b6</uuid>
  <forward mode='hostdev' managed='yes'>
    <address type='pci' domain='0x0000' bus='0x03' slot='0x10' function='0x0'/>
  </forward>
</network>

# virsh net-dumpxml passthrough
<network>
  <name>passthrough</name>
  <uuid>d65534ab-5de1-4071-a21f-0133b308fff3</uuid>
  <forward dev='enp3s16' mode='passthrough'>
    <interface dev='enp3s16'/>
  </forward>
</network>

# cat if-hostdev.xml
<interface type='network'>
    <source network='hostdev'/>
</interface>

# virsh attach-device r7-1 if-hostdev.xml
Device attached successfully

# virsh net-dumpxml hostdev
<network connections='1'>
  <name>hostdev</name>
  <uuid>e1c26bc3-5c86-42f6-a562-d860088283b6</uuid>
  <forward mode='hostdev' managed='yes'>
    <address type='pci' domain='0x0000' bus='0x03' slot='0x10' function='0x0'/>
  </forward>
</network>

# virsh destroy r7-1
Domain r7-1 destroyed

# virsh start r7-1
Domain r7-1 started

# cat if-passthrough.xml
<interface type='network'>
    <source network='passthrough'/>
</interface>

# virsh attach-device r7-1 if-passthrough.xml
Device attached successfully

# virsh dumpxml r7-1|grep "interface type='direct'" -A7
    <interface type='direct'>
      <mac address='52:54:00:ef:f9:be'/>
      <source network='passthrough' dev='enp3s16' mode='passthrough'/>
      <target dev='macvtap0'/>
      <model type='rtl8139'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </interface>

#  ip -d link show macvtap0
16: macvtap0@enp3s16: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT qlen 500
    link/ether 02:c4:9d:51:07:c6 brd ff:ff:ff:ff:ff:ff promiscuity 0 
    macvtap  mode passthru addrgenmode eui64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2202.html