qapi: net: Add query-netdev command

The query-netdev command is used to get the configuration of the current
network device backends (netdevs).
This is the QMP analog of the HMP command "info network" but only for
netdevs (i.e. excluding NIC and hubports).

The query-netdev command returns an array of objects of the NetdevInfo
type, which are an extension of Netdev type. It means that response can
be used for netdev-add after small modification. This can be useful for
recreate the same netdev configuration.

Information about the network device is filled in when it is created or
modified and is available through the NetClientState->stored_config.

Signed-off-by: Alexey Kirillov <lekiravi@yandex-team.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index fe659ec9e2..8c27ea0142 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -184,8 +184,22 @@ static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
     VhostVDPAState *s;
     int vdpa_device_fd = -1;
     int ret = 0;
+    NetdevVhostVDPAOptions *stored;
+
     assert(name);
     nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
+
+    /* Store startup parameters */
+    nc->stored_config = g_new0(NetdevInfo, 1);
+    nc->stored_config->type = NET_BACKEND_VHOST_VDPA;
+    stored = &nc->stored_config->u.vhost_vdpa;
+
+    stored->has_vhostdev = true;
+    stored->vhostdev = g_strdup(vhostdev);
+
+    stored->has_queues = true;
+    stored->queues = 1; /* TODO: change when support multiqueue */
+
     snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
     nc->queue_index = 0;
     s = DO_UPCAST(VhostVDPAState, nc, nc);