[PULL 25/90] net/tap: QOMify tap backend

["Michael S. Tsirkin" <mst@redhat.com>]

From: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>

We prepare for being able to migrate TAP backend. We'll need a
user change-able property for it, which can be set from machine
type. So, let's QOMify it first.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Ben Chaney <bchaney@akamai.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260819180201.1970193-8-vsementsov@yandex-team.ru>
---
 include/net/net.h |  7 +++++++
 include/net/tap.h |  2 ++
 net/net.c         | 14 +++++++-------
 net/tap.c         | 48 +++++++++++++++++++++++++++++++++++++++--------
 4 files changed, 56 insertions(+), 15 deletions(-)

diff --git a/include/net/net.h b/include/net/net.h
index 626b997948..ea07760b56 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -161,6 +161,13 @@ char *qemu_mac_strdup_printf(const uint8_t *macaddr);
 NetClientState *qemu_find_netdev(const char *id);
 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
                                  NetClientDriver type, int max);
+void qemu_net_client_setup(NetClientState *nc,
+                           NetClientInfo *info,
+                           NetClientState *peer,
+                           const char *model,
+                           const char *name,
+                           NetClientDestructor *destructor,
+                           bool is_datapath);
 NetClientState *qemu_new_net_client(NetClientInfo *info,
                                     NetClientState *peer,
                                     const char *model,
diff --git a/include/net/tap.h b/include/net/tap.h
index 6f34f13eae..268570571f 100644
--- a/include/net/tap.h
+++ b/include/net/tap.h
@@ -28,6 +28,8 @@
 
 #include "standard-headers/linux/virtio_net.h"
 
+#define TYPE_TAP_NETDEV "tap-netdev"
+
 int tap_enable(NetClientState *nc);
 int tap_disable(NetClientState *nc);
 
diff --git a/net/net.c b/net/net.c
index 1161183e18..d7fa637ce5 100644
--- a/net/net.c
+++ b/net/net.c
@@ -261,13 +261,13 @@ static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
                                        int iovcnt,
                                        void *opaque);
 
-static void qemu_net_client_setup(NetClientState *nc,
-                                  NetClientInfo *info,
-                                  NetClientState *peer,
-                                  const char *model,
-                                  const char *name,
-                                  NetClientDestructor *destructor,
-                                  bool is_datapath)
+void qemu_net_client_setup(NetClientState *nc,
+                           NetClientInfo *info,
+                           NetClientState *peer,
+                           const char *model,
+                           const char *name,
+                           NetClientDestructor *destructor,
+                           bool is_datapath)
 {
     nc->info = info;
     nc->model = g_strdup(model);
diff --git a/net/tap.c b/net/tap.c
index bfed74717e..7392344200 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -43,6 +43,7 @@
 #include "qemu/main-loop.h"
 #include "qemu/sockets.h"
 #include "hw/virtio/vhost.h"
+#include "qom/object.h"
 
 #include "net/tap.h"
 #include "net/util.h"
@@ -68,7 +69,11 @@ static const int kernel_feature_bits[] = {
     VHOST_INVALID_FEATURE_BIT
 };
 
-typedef struct TAPState {
+OBJECT_DECLARE_SIMPLE_TYPE(TAPState, TAP_NETDEV)
+
+struct TAPState {
+    Object parent_obj;
+
     NetClientState nc;
     int fd;
     int vhostfd;
@@ -86,7 +91,7 @@ typedef struct TAPState {
     VHostNetState *vhost_net;
     unsigned host_vnet_hdr_len;
     Notifier exit;
-} TAPState;
+};
 
 static void launch_script(const char *setup_script, const char *ifname,
                           int fd, Error **errp);
@@ -413,6 +418,19 @@ static VHostNetState *tap_get_vhost_net(NetClientState *nc)
     return s->vhost_net;
 }
 
+
+static const TypeInfo tap_netdev_info = {
+    .name = TYPE_TAP_NETDEV,
+    .parent = TYPE_OBJECT,
+    .instance_size = sizeof(TAPState),
+};
+
+static void tap_net_client_destructor(NetClientState *nc)
+{
+    TAPState *s = container_of(nc, TAPState, nc);
+    object_unref(OBJECT(s));
+}
+
 /* fd support */
 
 static NetClientInfo net_tap_info = {
@@ -435,6 +453,18 @@ static NetClientInfo net_tap_info = {
     .get_vhost_net = tap_get_vhost_net,
 };
 
+static TAPState *new_tap(NetClientState *peer,
+                         const char *model,
+                         const char *name)
+{
+    TAPState *s = TAP_NETDEV(object_new(TYPE_TAP_NETDEV));
+
+    qemu_net_client_setup(&s->nc, &net_tap_info, peer, model, name,
+                          tap_net_client_destructor, true);
+
+    return s;
+}
+
 static TAPState *net_tap_fd_init(NetClientState *peer,
                                  const char *model,
                                  const char *name,
@@ -442,12 +472,7 @@ static TAPState *net_tap_fd_init(NetClientState *peer,
                                  int vnet_hdr)
 {
     NetOffloads ol = {};
-    NetClientState *nc;
-    TAPState *s;
-
-    nc = qemu_new_net_client(&net_tap_info, peer, model, name);
-
-    s = container_of(nc, TAPState, nc);
+    TAPState *s = new_tap(peer, model, name);
 
     s->fd = fd;
     s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
@@ -1048,3 +1073,10 @@ int tap_disable(NetClientState *nc)
         return ret;
     }
 }
+
+static void tap_register_types(void)
+{
+    type_register_static(&tap_netdev_info);
+}
+
+type_init(tap_register_types)
-- 
MST