[Qemu-devel] [PATCH COLO-Frame v16 32/35] net: Add notifier/callback for netdev init

[zhanghailiang]

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 <address@hidden>
Cc: Jason Wang <address@hidden>
Cc: Yang Hongyang <address@hidden>
---
v16:
- Simplify the codes by using some helpers in QEMU
v14:
- New patch
---
 include/net/net.h |  3 +++
 net/net.c         | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index 73e4c46..d8abe7a 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -8,6 +8,7 @@
 #include "net/queue.h"
 #include "migration/vmstate.h"
 #include "qapi-types.h"
+#include "qemu/notify.h"
 
 #define MAX_QUEUE_NUM 1024
 
@@ -176,6 +177,8 @@ struct NICInfo {
     int nvectors;
 };
 
+void netdev_init_add_notifier(Notifier *notify);
+
 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 0ad6217..6d846f4 100644
--- a/net/net.c
+++ b/net/net.c
@@ -56,6 +56,9 @@
 static VMChangeStateEntry *net_change_state_entry;
 static QTAILQ_HEAD(, NetClientState) net_clients;
 
+static NotifierList netdev_init_notifiers =
+    NOTIFIER_LIST_INITIALIZER(netdev_init_notifiers);
+
 const char *host_net_devices[] = {
     "tap",
     "socket",
@@ -931,6 +934,10 @@ static int net_init_nic(const NetClientOptions *opts, 
const char *name,
     return idx;
 }
 
+void netdev_init_add_notifier(Notifier *notify)
+{
+    notifier_list_add(&netdev_init_notifiers, notify);
+}
 
 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
     const NetClientOptions *opts,
@@ -1017,6 +1024,11 @@ static int net_client_init1(const void *object, int 
is_netdev, Error **errp)
         }
         return -1;
     }
+    if (is_netdev) {
+        const Netdev *netdev = object;
+
+        notifier_list_notify(&netdev_init_notifiers, netdev->id);
+    }
     return 0;
 }
 
-- 
1.8.3.1