[Qemu-devel] [PATCH] net/filter: Fix the output information for command 'info network'

[zhanghailiang]

The properties of netfilter object could be changed by 'qom-set'
command, but the output of 'info network' command is not updated,
because it got the old information through nf->info_str, it will
not be updated while we change the value of netfilter's property.

Here we split a helper function that could colletct the output
information for filter, and also remove the useless member
'info_str' from struct NetFilterState.

Signed-off-by: zhanghailiang <address@hidden>
Cc: Jason Wang <address@hidden>
Cc: Eric Blake <address@hidden>
Cc: Markus Armbruster <address@hidden>
Cc: Yang Hongyang <address@hidden>
---
 include/net/filter.h |  3 ++-
 net/filter.c         | 47 ++++++++++++++++++++++++++---------------------
 net/net.c            |  5 ++++-
 3 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/include/net/filter.h b/include/net/filter.h
index 2deda36..8a20138 100644
--- a/include/net/filter.h
+++ b/include/net/filter.h
@@ -55,7 +55,6 @@ struct NetFilterState {
     char *netdev_id;
     NetClientState *netdev;
     NetFilterDirection direction;
-    char info_str[256];
     QTAILQ_ENTRY(NetFilterState) next;
 };
 
@@ -74,4 +73,6 @@ ssize_t qemu_netfilter_pass_to_next(NetClientState *sender,
                                     int iovcnt,
                                     void *opaque);
 
+void netfilter_print_info(NetFilterState *nf, char *output_str, int size);
+
 #endif /* QEMU_NET_FILTER_H */
diff --git a/net/filter.c b/net/filter.c
index 5d90f83..40254bd 100644
--- a/net/filter.c
+++ b/net/filter.c
@@ -128,6 +128,31 @@ static void netfilter_init(Object *obj)
                              NULL);
 }
 
+void netfilter_print_info(NetFilterState *nf, char *output_str, int size)
+{
+    char *str, *info;
+    ObjectProperty *prop;
+    ObjectPropertyIterator iter;
+    StringOutputVisitor *ov;
+
+    /* generate info str */
+    object_property_iter_init(&iter, OBJECT(nf));
+    while ((prop = object_property_iter_next(&iter))) {
+        if (!strcmp(prop->name, "type")) {
+            continue;
+        }
+        ov = string_output_visitor_new(false);
+        object_property_get(OBJECT(nf), string_output_get_visitor(ov),
+                            prop->name, NULL);
+        str = string_output_get_string(ov);
+        string_output_visitor_cleanup(ov);
+        info = g_strdup_printf(",%s=%s", prop->name, str);
+        g_strlcat(output_str, info, size);
+        g_free(str);
+        g_free(info);
+    }
+}
+
 static void netfilter_complete(UserCreatable *uc, Error **errp)
 {
     NetFilterState *nf = NETFILTER(uc);
@@ -135,10 +160,7 @@ static void netfilter_complete(UserCreatable *uc, Error 
**errp)
     NetFilterClass *nfc = NETFILTER_GET_CLASS(uc);
     int queues;
     Error *local_err = NULL;
-    char *str, *info;
-    ObjectProperty *prop;
-    ObjectPropertyIterator iter;
-    StringOutputVisitor *ov;
+
 
     if (!nf->netdev_id) {
         error_setg(errp, "Parameter 'netdev' is required");
@@ -172,23 +194,6 @@ static void netfilter_complete(UserCreatable *uc, Error 
**errp)
         }
     }
     QTAILQ_INSERT_TAIL(&nf->netdev->filters, nf, next);
-
-    /* generate info str */
-    object_property_iter_init(&iter, OBJECT(nf));
-    while ((prop = object_property_iter_next(&iter))) {
-        if (!strcmp(prop->name, "type")) {
-            continue;
-        }
-        ov = string_output_visitor_new(false);
-        object_property_get(OBJECT(nf), string_output_get_visitor(ov),
-                            prop->name, errp);
-        str = string_output_get_string(ov);
-        string_output_visitor_cleanup(ov);
-        info = g_strdup_printf(",%s=%s", prop->name, str);
-        g_strlcat(nf->info_str, info, sizeof(nf->info_str));
-        g_free(str);
-        g_free(info);
-    }
 }
 
 static void netfilter_finalize(Object *obj)
diff --git a/net/net.c b/net/net.c
index 87dd356..87de7c0 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1198,9 +1198,12 @@ void print_net_client(Monitor *mon, NetClientState *nc)
     }
     QTAILQ_FOREACH(nf, &nc->filters, next) {
         char *path = object_get_canonical_path_component(OBJECT(nf));
+        char info[256] = { 0 };
+
+        netfilter_print_info(nf, info, sizeof(info));
         monitor_printf(mon, "  - %s: type=%s%s\n", path,
                        object_get_typename(OBJECT(nf)),
-                       nf->info_str);
+                       info);
         g_free(path);
     }
 }
-- 
1.8.3.1