[Qemu-devel] [PATCH COLO-Frame v14 34/40] net: Add notifier/callback for netdev init

[zhanghailiang <zhang.zhanghailiang@huawei.com>]

We can register some callback for this notifier,
this will be used by COLO to register a callback which
will add each netdev a buffer filter.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Yang Hongyang <hongyang.yang@easystack.cn>
---
v14:
- New patch
---
 include/net/net.h |  4 ++++
 net/net.c         | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index 73e4c46..f6f0194 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -176,6 +176,10 @@ struct NICInfo {
     int nvectors;
 };
 
+typedef struct netdev_init_entry NetdevInitEntry;
+typedef void NetdevInitHandler(const char *netdev_id, void *opaque);
+NetdevInitEntry *netdev_init_add_handler(NetdevInitHandler *cb, void *opaque);
+
 extern int nb_nics;
 extern NICInfo nd_table[MAX_NICS];
 extern int default_net;
diff --git a/net/net.c b/net/net.c
index c5e414f..36f8345 100644
--- a/net/net.c
+++ b/net/net.c
@@ -55,6 +55,14 @@
 static VMChangeStateEntry *net_change_state_entry;
 static QTAILQ_HEAD(, NetClientState) net_clients;
 
+struct netdev_init_entry {
+    NetdevInitHandler *cb;
+    void *opaque;
+    QLIST_ENTRY(netdev_init_entry) entries;
+};
+
+static QLIST_HEAD(netdev_init_head, netdev_init_entry)netdev_init_head;
+
 const char *host_net_devices[] = {
     "tap",
     "socket",
@@ -953,6 +961,26 @@ static int net_init_nic(const NetClientOptions *opts, const char *name,
     return idx;
 }
 
+NetdevInitEntry *netdev_init_add_handler(NetdevInitHandler *cb, void *opaque)
+{
+    NetdevInitEntry *e;
+
+    e = g_malloc0(sizeof(*e));
+
+    e->cb = cb;
+    e->opaque = opaque;
+    QLIST_INSERT_HEAD(&netdev_init_head, e, entries);
+    return e;
+}
+
+static void netdev_init_notify(const char *netdev_id)
+{
+    NetdevInitEntry *e, *next;
+
+    QLIST_FOREACH_SAFE(e, &netdev_init_head, entries, next) {
+        e->cb(netdev_id, e->opaque);
+    }
+}
 
 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
     const NetClientOptions *opts,
@@ -1039,6 +1067,11 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
         }
         return -1;
     }
+    if (is_netdev) {
+        const Netdev *netdev = object;
+
+        netdev_init_notify(netdev->id);
+    }
     return 0;
 }
 
-- 
1.8.3.1