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authorTom Gundersen <teg@jklm.no>2015-08-25 14:12:19 +0200
committerTom Gundersen <teg@jklm.no>2015-09-02 14:24:17 +0200
commit54683f0f9b97a8f88aaf4fbb45b4d729057b101c (patch)
tree9b8bf63b5c1e153fb0099c691511f655a1ee361b /src/udev
parentfc94c3260549c12892461be031c4b9dc122ca1ef (diff)
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 bf81e792f3c0). 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.
Diffstat (limited to 'src/udev')
-rw-r--r--src/udev/udev-builtin-net_id.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c
index 6e7e1271fb..589f1f7822 100644
--- a/src/udev/udev-builtin-net_id.c
+++ b/src/udev/udev-builtin-net_id.c
@@ -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;