[libvirt] [PATCH v3] automatic create tap device with network type ethernet
Vasiliy Tolstov
v.tolstov at selfip.ru
Fri Dec 5 15:18:26 UTC 2014
If user not specify network type ethernet, assume that user
needs simple tap device created with libvirt.
This patch does not need to run external script to create tap device or
add root to qemu process. Also libvirt runs script after device creating,
if user provide it.
Signed-off-by: Vasiliy Tolstov <v.tolstov at selfip.ru>
---
src/qemu/qemu_command.c | 119 ++++++++++++++++++++++++++++++++++--------------
src/qemu/qemu_hotplug.c | 10 +---
src/qemu/qemu_process.c | 4 ++
3 files changed, 92 insertions(+), 41 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 1831323..fe33125 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -276,6 +276,40 @@ static int
qemuCreateInBridgePortWithHelper(virQEMUDriverConfigPtr cfg,
return *tapfd < 0 ? -1 : 0;
}
+/**
+ * qemuExecuteEthernetScript:
+ * @ifname: the interface name
+ * @script: the script name
+
+ * This function executes script for new tap device created by libvirt.
+ *
+ * Returns 0 in case of success or -1 on failure
+ */
+static int qemuExecuteEthernetScript(const char *ifname, const char *script)
+{
+ virCommandPtr cmd;
+ int ret;
+
+ cmd = virCommandNew(script);
+ virCommandAddArgFormat(cmd, "%s", ifname);
+ virCommandClearCaps(cmd);
+#ifdef CAP_NET_ADMIN
+ virCommandAllowCap(cmd, CAP_NET_ADMIN);
+#endif
+ virCommandAddEnvPassCommon(cmd);
+
+ if (virCommandRun(cmd, NULL) < 0) {
+ ret = -1;
+ } else {
+ ret = 0;
+ }
+
+ cleanup:
+ virCommandFree(cmd);
+ return ret;
+}
+
+
int
qemuNetworkIfaceConnect(virDomainDefPtr def,
virConnectPtr conn,
@@ -313,7 +347,7 @@ qemuNetworkIfaceConnect(virDomainDefPtr def,
} else if (actualType == VIR_DOMAIN_NET_TYPE_BRIDGE) {
if (VIR_STRDUP(brname, virDomainNetGetActualBridgeName(net)) < 0)
return ret;
- } else {
+ } else if (actualType != VIR_DOMAIN_NET_TYPE_ETHERNET) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Network type %d is not supported"),
virDomainNetGetActualType(net));
@@ -335,30 +369,42 @@ qemuNetworkIfaceConnect(virDomainDefPtr def,
tap_create_flags |= VIR_NETDEV_TAP_CREATE_VNET_HDR;
}
- if (cfg->privileged) {
- if (virNetDevTapCreateInBridgePort(brname, &net->ifname, &net->mac,
- def->uuid, tunpath, tapfd,
*tapfdSize,
-
virDomainNetGetActualVirtPortProfile(net),
- virDomainNetGetActualVlan(net),
- tap_create_flags) < 0) {
+ if (actualType == VIR_DOMAIN_NET_TYPE_ETHERNET) {
+ if (virNetDevTapCreate(&net->ifname, tunpath, tapfd, *tapfdSize,
+ tap_create_flags) < 0) {
virDomainAuditNetDevice(def, net, tunpath, false);
goto cleanup;
}
- } else {
- if (qemuCreateInBridgePortWithHelper(cfg, brname,
- &net->ifname,
- tapfd, tap_create_flags) < 0) {
- virDomainAuditNetDevice(def, net, tunpath, false);
+ if (qemuExecuteEthernetScript(net->ifname, net->script) < 0)
goto cleanup;
+ if (virNetDevSetOnline(net->ifname, !!(tap_create_flags &
VIR_NETDEV_TAP_CREATE_IFUP)) < 0)
+ goto cleanup;
+ } else {
+ if (cfg->privileged) {
+ if (virNetDevTapCreateInBridgePort(brname, &net->ifname, &net->mac,
+ def->uuid, tunpath,
tapfd, *tapfdSize,
+
virDomainNetGetActualVirtPortProfile(net),
+ virDomainNetGetActualVlan(net),
+ tap_create_flags) < 0) {
+ virDomainAuditNetDevice(def, net, tunpath, false);
+ goto cleanup;
+ }
+ } else {
+ if (qemuCreateInBridgePortWithHelper(cfg, brname,
+ &net->ifname,
+ tapfd,
tap_create_flags) < 0) {
+ virDomainAuditNetDevice(def, net, tunpath, false);
+ goto cleanup;
+ }
+ /* qemuCreateInBridgePortWithHelper can only create a single FD */
+ if (*tapfdSize > 1) {
+ VIR_WARN("Ignoring multiqueue network request");
+ *tapfdSize = 1;
+ }
}
- /* qemuCreateInBridgePortWithHelper can only create a single FD */
- if (*tapfdSize > 1) {
- VIR_WARN("Ignoring multiqueue network request");
- *tapfdSize = 1;
- }
- }
- virDomainAuditNetDevice(def, net, tunpath, true);
+ virDomainAuditNetDevice(def, net, tunpath, true);
+ }
if (cfg->macFilter &&
ebtablesAddForwardAllowIn(driver->ebtables,
@@ -4534,18 +4580,23 @@ qemuBuildHostNetStr(virDomainNetDefPtr net,
break;
case VIR_DOMAIN_NET_TYPE_ETHERNET:
- virBufferAddLit(&buf, "tap");
- if (net->ifname) {
- virBufferAsprintf(&buf, "%cifname=%s", type_sep, net->ifname);
- type_sep = ',';
- }
- if (net->script) {
- virBufferAsprintf(&buf, "%cscript=%s", type_sep,
- net->script);
- type_sep = ',';
- }
- is_tap = true;
- break;
+ virBufferAddLit(&buf, "tap");
+ type_sep = ',';
+ /* for one tapfd 'fd=' shall be used,
+ * for more than one 'fds=' is the right choice */
+ if (tapfdSize == 1) {
+ virBufferAsprintf(&buf, "%cfd=%s", type_sep, tapfd[0]);
+ } else {
+ virBufferAsprintf(&buf, "%cfds=", type_sep);
+ for (i = 0; i < tapfdSize; i++) {
+ if (i)
+ virBufferAddChar(&buf, ':');
+ virBufferAdd(&buf, tapfd[i], -1);
+ }
+ }
+ type_sep = ',';
+ is_tap = true;
+ break;
case VIR_DOMAIN_NET_TYPE_CLIENT:
virBufferAsprintf(&buf, "socket%cconnect=%s:%d",
@@ -7366,7 +7417,8 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
/* Currently nothing besides TAP devices supports multiqueue. */
if (net->driver.virtio.queues > 0 &&
!(actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
- actualType == VIR_DOMAIN_NET_TYPE_BRIDGE)) {
+ actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
+ actualType == VIR_DOMAIN_NET_TYPE_ETHERNET)) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("Multiqueue network is not supported for: %s"),
virDomainNetTypeToString(actualType));
@@ -7374,7 +7426,8 @@ qemuBuildInterfaceCommandLine(virCommandPtr cmd,
}
if (actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
- actualType == VIR_DOMAIN_NET_TYPE_BRIDGE) {
+ actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
+ actualType == VIR_DOMAIN_NET_TYPE_ETHERNET) {
tapfdSize = net->driver.virtio.queues;
if (!tapfdSize)
tapfdSize = 1;
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 9467d7d..1175259 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -908,7 +908,8 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
}
if (actualType == VIR_DOMAIN_NET_TYPE_BRIDGE ||
- actualType == VIR_DOMAIN_NET_TYPE_NETWORK) {
+ actualType == VIR_DOMAIN_NET_TYPE_NETWORK ||
+ actualType == VIR_DOMAIN_NET_TYPE_ETHERNET) {
tapfdSize = vhostfdSize = net->driver.virtio.queues;
if (!tapfdSize)
tapfdSize = vhostfdSize = 1;
@@ -939,13 +940,6 @@ int qemuDomainAttachNetDevice(virConnectPtr conn,
iface_connected = true;
if (qemuOpenVhostNet(vm->def, net, priv->qemuCaps, vhostfd,
&vhostfdSize) < 0)
goto cleanup;
- } else if (actualType == VIR_DOMAIN_NET_TYPE_ETHERNET) {
- vhostfdSize = 1;
- if (VIR_ALLOC(vhostfd) < 0)
- goto cleanup;
- *vhostfd = -1;
- if (qemuOpenVhostNet(vm->def, net, priv->qemuCaps, vhostfd,
&vhostfdSize) < 0)
- goto cleanup;
}
/* Set Bandwidth */
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index a14b6f7..0dbf7fb 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -5064,6 +5064,10 @@ void qemuProcessStop(virQEMUDriverPtr driver,
cfg->stateDir));
VIR_FREE(net->ifname);
break;
+ case VIR_DOMAIN_NET_TYPE_ETHERNET:
+ ignore_value(virNetDevTapDelete(net->ifname, net->backend.tap));
+ VIR_FREE(net->ifname);
+ break;
case VIR_DOMAIN_NET_TYPE_BRIDGE:
case VIR_DOMAIN_NET_TYPE_NETWORK:
#ifdef VIR_NETDEV_TAP_REQUIRE_MANUAL_CLEANUP
--
2.1.3
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