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udev: net_id - support predictable ifnames on virtio buses 

Virtio buses are undeterministically enumerated, so we cannot use them as a basis
for deterministic naming (see bf81e792f3). However, we are guaranteed that there
is only ever one virtio bus for every parent device, so we can simply skip over
the virtio buses when naming the devices.
This commit is contained in:
Tom Gundersen 2015-08-25 14:12:19 +02:00
parent fc94c32605
commit 54683f0f9b
1 changed files with 8 additions and 0 deletions
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8
src/udev/udev-builtin-net_id.c
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@ -280,8 +280,16 @@ static int names_pci(struct udev_device *dev, struct netnames *names) {
assert(names);
parent = udev_device_get_parent(dev);
/* there can only ever be one virtio bus per parent device, so we can
safely ignore any virtio buses. see
<http://lists.linuxfoundation.org/pipermail/virtualization/2015-August/030331.html> */
while (parent && streq_ptr("virtio", udev_device_get_subsystem(parent)))
parent = udev_device_get_parent(parent);
if (!parent)
return -ENOENT;
/* check if our direct parent is a PCI device with no other bus in-between */
if (streq_ptr("pci", udev_device_get_subsystem(parent))) {
names->type = NET_PCI;