@@ -658,6 +658,8 @@ VLANClientState *qemu_find_netdev(const char *id)
VLANClientState *vc;
QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
+ if (vc->info->type == NET_CLIENT_TYPE_NIC)
+ continue;
if (!strcmp(vc->name, id)) {
return vc;
}
@@ -1217,7 +1219,7 @@ int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
VLANClientState *vc;
vc = qemu_find_netdev(id);
- if (!vc || vc->info->type == NET_CLIENT_TYPE_NIC) {
+ if (!vc) {
qerror_report(QERR_DEVICE_NOT_FOUND, id);
return -1;
}
@@ -1262,7 +1264,11 @@ int do_set_link(Monitor *mon, const QDict *qdict, QObject **ret_data)
}
}
}
- vc = qemu_find_netdev(name);
+ QTAILQ_FOREACH(vc, &non_vlan_clients, next) {
+ if (!strcmp(vc->name, name)) {
+ goto done;
+ }
+ }
done:
if (!vc) {
qemu_find_netdev() looks up members of non_vlan_clients by name. It happily returns the first match. Trouble is the names need not be unique. non_vlan_clients contains host parts (netdevs) and guest parts (NICs). Netdevs have unique names: a netdev's name is a (mandatory) qemu_netdev_opts ID, and these are unique. NIC names are not unique. If a NIC has a qdev ID (which is unique), that's its name. Else, we make up a name. The made-up names are unique, but they can clash with qdev IDs. Even if NICs had unique names, they could still clash with netdev names. Callers of qemu_find_netdev(): * net_init_nic() wants a netdev. It happens to work because it runs before NICs get added to non_vlan_clients. * do_netdev_del() wants a netdev. If it gets a NIC, it complains and fails. Bug: a netdev with the same name that comes later in non_vlan_clients can't be deleted: $ qemu-system-x86_64 -nodefaults -vnc :0 -S -monitor stdio -netdev user,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=virtio1 [...] (qemu) netdev_add user,id=virtio1 (qemu) info network Devices not on any VLAN: hostnet0: net=10.0.2.0, restricted=n peer=virtio1 virtio1: model=virtio-net-pci,macaddr=52:54:00:12:34:56 peer=hostnet0 virtio1: net=10.0.2.0, restricted=n (qemu) netdev_del virtio1 Device 'virtio1' not found * parse_netdev() wants a netdev. If it gets a NIC, it gets confused. With the test setup above: (qemu) device_add virtio-net-pci,netdev=virtio1 Property 'virtio-net-pci.netdev' can't take value 'virtio1', it's in use You can even connect two NICs to each other: $ qemu-system-x86_64 -nodefaults -vnc :0 -S -monitor stdio -device virtio-net-pci,id=virtio1 -device e1000,netdev=virtio1 [...] Devices not on any VLAN: virtio1: model=virtio-net-pci,macaddr=52:54:00:12:34:56 peer=e1000.0 e1000.0: model=e1000,macaddr=52:54:00:12:34:57 peer=virtio1 (qemu) q Segmentation fault (core dumped) * do_set_link() works fine for both netdevs and NICs. Whether it really makes sense for netdevs is debatable, but that's outside this patch's scope. Change qemu_find_netdev() to return only netdevs. This fixes the netdev_del and device_add/-device bugs demonstrated above. To avoid changing set_link, make do_set_link() search non_vlan_clients by hand instead of calling qemu_find_netdev(). Signed-off-by: Markus Armbruster <armbru@redhat.com> --- net.c | 10 ++++++++-- 1 files changed, 8 insertions(+), 2 deletions(-)