monitor: New commands netdev_add, netdev_del

Monitor commands to go with -netdev.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

net.c

@@ -1194,6 +1194,61 @@ void net_host_device_remove(Monitor *mon, const QDict *qdict)
     qemu_del_vlan_client(vc);
 }
 
+/**
+ * do_netdev_add(): Add a host network device
+ *
+ * Argument qdict contains
+ * - "type": the device type, "tap", "user", ...
+ * - "id": the device's ID (must be unique)
+ * - device options
+ *
+ * Example:
+ *
+ * { "type": "user", "id": "netdev1", "hostname": "a-guest" }
+ */
+int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+    QemuOpts *opts;
+    int res;
+
+    opts = qemu_opts_from_qdict(&qemu_netdev_opts, qdict);
+    if (!opts) {
+        return -1;
+    }
+
+    res = net_client_init(mon, opts, 1);
+    return res;
+}
+
+/**
+ * do_netdev_del(): Delete a host network device
+ *
+ * Argument qdict contains
+ * - "id": the device's ID
+ *
+ * Example:
+ *
+ * { "id": "netdev1" }
+ */
+int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+    const char *id = qdict_get_str(qdict, "id");
+    VLANClientState *vc;
+
+    vc = qemu_find_netdev(id);
+    if (!vc || vc->info->type == NET_CLIENT_TYPE_NIC) {
+        qerror_report(QERR_DEVICE_NOT_FOUND, id);
+        return -1;
+    }
+    if (vc->peer) {
+        qerror_report(QERR_DEVICE_IN_USE, id);
+        return -1;
+    }
+    qemu_del_vlan_client(vc);
+    qemu_opts_del(qemu_opts_find(&qemu_netdev_opts, id));
+    return 0;
+}
+
 void do_info_network(Monitor *mon)
 {
     VLANState *vlan;

net.h

@@ -164,6 +164,8 @@ void net_check_clients(void);
 void net_cleanup(void);
 void net_host_device_add(Monitor *mon, const QDict *qdict);
 void net_host_device_remove(Monitor *mon, const QDict *qdict);
+int do_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret_data);
+int do_netdev_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
 
 #define DEFAULT_NETWORK_SCRIPT "/etc/qemu-ifup"
 #define DEFAULT_NETWORK_DOWN_SCRIPT "/etc/qemu-ifdown"

qemu-monitor.hx

@@ -912,6 +912,36 @@ STEXI
 @item host_net_remove
 @findex host_net_remove
 Remove host VLAN client.
+ETEXI
+
+    {
+        .name       = "netdev_add",
+        .args_type  = "netdev:O",
+        .params     = "[user|tap|socket],id=str[,prop=value][,...]",
+        .help       = "add host network device",
+        .user_print = monitor_user_noop,
+        .mhandler.cmd_new = do_netdev_add,
+    },
+
+STEXI
+@item netdev_add
+@findex netdev_add
+Add host network device.
+ETEXI
+
+    {
+        .name       = "netdev_del",
+        .args_type  = "id:s",
+        .params     = "id",
+        .help       = "remove host network device",
+        .user_print = monitor_user_noop,
+        .mhandler.cmd_new = do_netdev_del,
+    },
+
+STEXI
+@item netdev_del
+@findex netdev_del
+Remove host network device.
 ETEXI
 
 #ifdef CONFIG_SLIRP