Re: [libvirt] Using Libvirt to change the bridge a virtual network card of a running vm is connected to

I was sure that I did that before. Apparently I was wrong. Sorry for that. diff --git a/.gnulib b/.gnulib index d5612c7..e9e8aba 160000 --- a/.gnulib +++ b/.gnulib @@ -1 +1 @@ -Subproject commit d5612c714c87555f1059d71d347e20271dced322 +Subproject commit e9e8aba12af3c903edd422fa036a356c5b2f313a diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c index 1e56354..de54710 100644 --- a/src/qemu/qemu_hotplug.c +++ b/src/qemu/qemu_hotplug.c @@ -40,6 +40,8 @@ #include "qemu_cgroup.h" #include "locking/domain_lock.h" #include "network/bridge_driver.h" +#include "util/virnetdev.h" +#include "util/virnetdevbridge.h" #include "virnetdevtap.h" #define VIR_FROM_THIS VIR_FROM_QEMU @@ -1191,6 +1193,44 @@ static virDomainNetDefPtr qemuDomainFindNet(virDomainObjPtr vm, return NULL; } +int qemuDomainChangeNetBridge(virDomainNetDefPtr olddev, + virDomainNetDefPtr newdev) +{ + const char *oldbridge = olddev->data.bridge.brname; + const char *newbridge = newdev->data.bridge.brname; + + VIR_DEBUG("Change bridge for interface %s: %s -> %s", + olddev->ifname, oldbridge, newbridge); + + if (!virNetDevExists(newbridge)) { + qemuReportError(VIR_ERR_OPERATION_FAILED, "%s", + _("unable to remove port from bridge")); + return -1; + } + + if (oldbridge&& + virNetDevBridgeRemovePort(oldbridge, olddev->ifname)< 0) { + qemuReportError(VIR_ERR_OPERATION_FAILED, + _("unable to remove port from bridge %s"), oldbridge); + return -1; + } + if (virNetDevBridgeAddPort(newbridge, newdev->ifname)< 0) { + qemuReportError(VIR_ERR_OPERATION_FAILED, + _("unable to add port to bridge %s"), newbridge); + if (virNetDevBridgeAddPort(oldbridge, olddev->ifname)< 0) { + qemuReportError(VIR_ERR_OPERATION_FAILED, + _("unable to recover former state by adding port to bridge %s"), oldbridge); + VIR_FREE(olddev->data.bridge.brname); + } + return -1; + } + VIR_FREE(olddev->data.bridge.brname); + olddev->data.bridge.brname = newdev->data.bridge.brname; + newdev->data.bridge.brname = NULL; + return 0; +} + + int qemuDomainChangeNetLinkState(struct qemud_driver *driver, virDomainObjPtr vm, virDomainNetDefPtr dev, @@ -1321,6 +1361,13 @@ int qemuDomainChangeNet(struct qemud_driver *driver, return -1; } + if (olddev->type == VIR_DOMAIN_NET_TYPE_BRIDGE +&& dev->type == VIR_DOMAIN_NET_TYPE_BRIDGE +&& STRNEQ_NULLABLE(olddev->data.bridge.brname, dev->data.bridge.brname)) { + if ((ret = qemuDomainChangeNetBridge(olddev, dev))< 0) + return ret; + } + if (olddev->linkstate != dev->linkstate) { if ((ret = qemuDomainChangeNetLinkState(driver, vm, olddev, dev->linkstate))< 0) return ret; diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h index 0310361..1e1f75c 100644 --- a/src/qemu/qemu_hotplug.h +++ b/src/qemu/qemu_hotplug.h @@ -80,6 +80,8 @@ int qemuDomainChangeNetLinkState(struct qemud_driver *driver, virDomainObjPtr vm, virDomainNetDefPtr dev, int linkstate); +int qemuDomainChangeNetBridge(virDomainNetDefPtr olddev, + virDomainNetDefPtr newdev); int qemuDomainDetachPciDiskDevice(struct qemud_driver *driver, virDomainObjPtr vm, virDomainDeviceDefPtr dev); On 16.03.2012 00:06, Eric Blake wrote: