[Qemu-devel] [PATCH COLO-Frame v10 32/38] netfilter: Add a public API to release all the buffered packets

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

For COLO or MC FT, We need a function to release all the buffered packets
actively.

Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Cc: Jason Wang <jasowang@redhat.com>
---
v10: new patch
---
 include/net/filter.h |  1 +
 include/net/net.h    |  4 ++++
 net/filter-buffer.c  | 15 +++++++++++++++
 net/net.c            | 24 ++++++++++++++++++++++++
 4 files changed, 44 insertions(+)

diff --git a/include/net/filter.h b/include/net/filter.h
index 2deda36..5a09607 100644
--- a/include/net/filter.h
+++ b/include/net/filter.h
@@ -73,5 +73,6 @@ ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
                                     const struct iovec *iov,
                                     int iovcnt,
                                     void *opaque);
+void filter_buffer_release_all(void);
 
 #endif /* QEMU_NET_FILTER_H */
diff --git a/include/net/net.h b/include/net/net.h
index 7af3e15..5c65c45 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -125,6 +125,10 @@ NetClientState *qemu_find_vlan_client_by_name(Monitor *mon, int vlan_id,
                                               const char *client_str);
 typedef void (*qemu_nic_foreach)(NICState *nic, void *opaque);
 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque);
+typedef void (*qemu_netfilter_foreach)(NetFilterState *nf, void *opaque,
+                                       Error **errp);
+void qemu_foreach_netfilter(qemu_netfilter_foreach func, void *opaque,
+                            Error **errp);
 int qemu_can_send_packet(NetClientState *nc);
 ssize_t qemu_sendv_packet(NetClientState *nc, const struct iovec *iov,
                           int iovcnt);
diff --git a/net/filter-buffer.c b/net/filter-buffer.c
index 57be149..b344901 100644
--- a/net/filter-buffer.c
+++ b/net/filter-buffer.c
@@ -14,6 +14,7 @@
 #include "qapi/qmp/qerror.h"
 #include "qapi-visit.h"
 #include "qom/object.h"
+#include "net/net.h"
 
 #define TYPE_FILTER_BUFFER "filter-buffer"
 
@@ -163,6 +164,20 @@ out:
     error_propagate(errp, local_err);
 }
 
+static void filter_buffer_release_packets(NetFilterState *nf, void *opaque,
+                                          Error **errp)
+{
+    if (!strcmp(object_get_typename(OBJECT(nf)), TYPE_FILTER_BUFFER)) {
+        filter_buffer_flush(nf);
+    }
+}
+
+/* public APIs */
+void filter_buffer_release_all(void)
+{
+    qemu_foreach_netfilter(filter_buffer_release_packets, NULL, NULL);
+}
+
 static void filter_buffer_init(Object *obj)
 {
     object_property_add(obj, "interval", "int",
diff --git a/net/net.c b/net/net.c
index a3e9d1a..a333b01 100644
--- a/net/net.c
+++ b/net/net.c
@@ -259,6 +259,30 @@ static char *assign_name(NetClientState *nc1, const char *model)
     return g_strdup_printf("%s.%d", model, id);
 }
 
+void qemu_foreach_netfilter(qemu_netfilter_foreach func, void *opaque,
+                            Error **errp)
+{
+    NetClientState *nc;
+    NetFilterState *nf;
+
+    QTAILQ_FOREACH(nc, &net_clients, next) {
+        if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
+            continue;
+        }
+        QTAILQ_FOREACH(nf, &nc->filters, next) {
+            if (func) {
+                Error *local_err = NULL;
+
+                func(nf, opaque, &local_err);
+                if (local_err) {
+                    error_propagate(errp, local_err);
+                    return;
+                }
+            }
+        }
+    }
+}
+
 static void qemu_net_client_destructor(NetClientState *nc)
 {
     g_free(nc);
-- 
1.8.3.1